diff --git a/.gitattributes b/.gitattributes
index 3b0b5c0a65ff3fcacb8b17939f84afe115c44eab..6a064b0b676ee557b6f42071e4ee54cb7ff6d27a 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -35,3 +35,5 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
 bicycle.mp4 filter=lfs diff=lfs merge=lfs -text
 cooking.mp4 filter=lfs diff=lfs merge=lfs -text
+ffmpeg/ffmpeg filter=lfs diff=lfs merge=lfs -text
+ffmpeg/ffprobe filter=lfs diff=lfs merge=lfs -text
diff --git a/ffmpeg/GPLv3.txt b/ffmpeg/GPLv3.txt
new file mode 100644
index 0000000000000000000000000000000000000000..94a9ed024d3859793618152ea559a168bbcbb5e2
--- /dev/null
+++ b/ffmpeg/GPLv3.txt
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/ffmpeg/ffmpeg b/ffmpeg/ffmpeg
new file mode 100644
index 0000000000000000000000000000000000000000..0bdcbdd4329a0418dd255b365d59fdddbcaee747
--- /dev/null
+++ b/ffmpeg/ffmpeg
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2856e9a87be9ab140e199ef06d64ea635a17b2e1246c3f3ac7ce09fbdc412b7c
+size 79822176
diff --git a/ffmpeg/ffprobe b/ffmpeg/ffprobe
new file mode 100644
index 0000000000000000000000000000000000000000..5bb14f9685cb13e320f5beb88263db24682d9cdd
--- /dev/null
+++ b/ffmpeg/ffprobe
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+version https://git-lfs.github.com/spec/v1
+oid sha256:f7667d1b4c2bb00e0e355617d79a419ba5a2c166c20072f95ae7513ccd1cabba
+size 79657600
diff --git a/ffmpeg/manpages/ffmpeg-all.txt b/ffmpeg/manpages/ffmpeg-all.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7bc120d771e98957d5ab67ec23fc5de621969dfd
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-all.txt
@@ -0,0 +1,51154 @@
+FFMPEG-ALL(1)							 FFMPEG-ALL(1)
+
+NAME
+       ffmpeg - ffmpeg media converter
+
+SYNOPSIS
+       ffmpeg [global_options] {[input_file_options] -i input_url} ...
+       {[output_file_options] output_url} ...
+
+DESCRIPTION
+       ffmpeg is a universal media converter. It can read a wide variety of
+       inputs - including live grabbing/recording devices - filter, and
+       transcode them into a plethora of output formats.
+
+       ffmpeg reads from an arbitrary number of input "files" (which can be
+       regular files, pipes, network streams, grabbing devices, etc.),
+       specified by the "-i" option, and writes to an arbitrary number of
+       output "files", which are specified by a plain output url. Anything
+       found on the command line which cannot be interpreted as an option is
+       considered to be an output url.
+
+       Each input or output url can, in principle, contain any number of
+       streams of different types (video/audio/subtitle/attachment/data). The
+       allowed number and/or types of streams may be limited by the container
+       format. Selecting which streams from which inputs will go into which
+       output is either done automatically or with the "-map" option (see the
+       Stream selection chapter).
+
+       To refer to input files in options, you must use their indices
+       (0-based). E.g.	the first input file is 0, the second is 1, etc.
+       Similarly, streams within a file are referred to by their indices. E.g.
+       "2:3" refers to the fourth stream in the third input file. Also see the
+       Stream specifiers chapter.
+
+       As a general rule, options are applied to the next specified file.
+       Therefore, order is important, and you can have the same option on the
+       command line multiple times. Each occurrence is then applied to the
+       next input or output file.  Exceptions from this rule are the global
+       options (e.g. verbosity level), which should be specified first.
+
+       Do not mix input and output files -- first specify all input files,
+       then all output files. Also do not mix options which belong to
+       different files. All options apply ONLY to the next input or output
+       file and are reset between files.
+
+       Some simple examples follow.
+
+       o   Convert an input media file to a different format, by re-encoding
+	   media streams:
+
+		   ffmpeg -i input.avi output.mp4
+
+       o   Set the video bitrate of the output file to 64 kbit/s:
+
+		   ffmpeg -i input.avi -b:v 64k -bufsize 64k output.mp4
+
+       o   Force the frame rate of the output file to 24 fps:
+
+		   ffmpeg -i input.avi -r 24 output.mp4
+
+       o   Force the frame rate of the input file (valid for raw formats only)
+	   to 1 fps and the frame rate of the output file to 24 fps:
+
+		   ffmpeg -r 1 -i input.m2v -r 24 output.mp4
+
+       The format option may be needed for raw input files.
+
+DETAILED DESCRIPTION
+       The transcoding process in ffmpeg for each output can be described by
+       the following diagram:
+
+		_______ 	     ______________
+	       |       |	    |		   |
+	       | input |  demuxer   | encoded data |   decoder
+	       | file  | ---------> | packets	   | -----+
+	       |_______|	    |______________|	  |
+							  v
+						      _________
+						     |	       |
+						     | decoded |
+						     | frames  |
+						     |_________|
+		________	     ______________	  |
+	       |	|	    |		   |	  |
+	       | output | <-------- | encoded data | <----+
+	       | file	|   muxer   | packets	   |   encoder
+	       |________|	    |______________|
+
+       ffmpeg calls the libavformat library (containing demuxers) to read
+       input files and get packets containing encoded data from them. When
+       there are multiple input files, ffmpeg tries to keep them synchronized
+       by tracking lowest timestamp on any active input stream.
+
+       Encoded packets are then passed to the decoder (unless streamcopy is
+       selected for the stream, see further for a description). The decoder
+       produces uncompressed frames (raw video/PCM audio/...) which can be
+       processed further by filtering (see next section). After filtering, the
+       frames are passed to the encoder, which encodes them and outputs
+       encoded packets. Finally, those are passed to the muxer, which writes
+       the encoded packets to the output file.
+
+   Filtering
+       Before encoding, ffmpeg can process raw audio and video frames using
+       filters from the libavfilter library. Several chained filters form a
+       filter graph. ffmpeg distinguishes between two types of filtergraphs:
+       simple and complex.
+
+       Simple filtergraphs
+
+       Simple filtergraphs are those that have exactly one input and output,
+       both of the same type. In the above diagram they can be represented by
+       simply inserting an additional step between decoding and encoding:
+
+		_________			 ______________
+	       |	 |			|	       |
+	       | decoded |			| encoded data |
+	       | frames  |\		      _ | packets      |
+	       |_________| \		      /||______________|
+			    \	__________   /
+		 simple     _\||	  | /  encoder
+		 filtergraph   | filtered |/
+			       | frames   |
+			       |__________|
+
+       Simple filtergraphs are configured with the per-stream -filter option
+       (with -vf and -af aliases for video and audio respectively).  A simple
+       filtergraph for video can look for example like this:
+
+		_______        _____________	    _______	   ________
+	       |       |      | 	    |	   |	   |	  |	   |
+	       | input | ---> | deinterlace | ---> | scale | ---> | output |
+	       |_______|      |_____________|	   |_______|	  |________|
+
+       Note that some filters change frame properties but not frame contents.
+       E.g. the "fps" filter in the example above changes number of frames,
+       but does not touch the frame contents. Another example is the "setpts"
+       filter, which only sets timestamps and otherwise passes the frames
+       unchanged.
+
+       Complex filtergraphs
+
+       Complex filtergraphs are those which cannot be described as simply a
+       linear processing chain applied to one stream. This is the case, for
+       example, when the graph has more than one input and/or output, or when
+       output stream type is different from input. They can be represented
+       with the following diagram:
+
+		_________
+	       |	 |
+	       | input 0 |\		       __________
+	       |_________| \		      | 	 |
+			    \	_________    /| output 0 |
+			     \ |	 |  / |__________|
+		_________     \| complex | /
+	       |	 |     |	 |/
+	       | input 1 |---->| filter  |\
+	       |_________|     |	 | \   __________
+			      /| graph	 |  \ | 	 |
+			     / |	 |   \| output 1 |
+		_________   /  |_________|    |__________|
+	       |	 | /
+	       | input 2 |/
+	       |_________|
+
+       Complex filtergraphs are configured with the -filter_complex option.
+       Note that this option is global, since a complex filtergraph, by its
+       nature, cannot be unambiguously associated with a single stream or
+       file.
+
+       The -lavfi option is equivalent to -filter_complex.
+
+       A trivial example of a complex filtergraph is the "overlay" filter,
+       which has two video inputs and one video output, containing one video
+       overlaid on top of the other. Its audio counterpart is the "amix"
+       filter.
+
+   Stream copy
+       Stream copy is a mode selected by supplying the "copy" parameter to the
+       -codec option. It makes ffmpeg omit the decoding and encoding step for
+       the specified stream, so it does only demuxing and muxing. It is useful
+       for changing the container format or modifying container-level
+       metadata. The diagram above will, in this case, simplify to this:
+
+		_______ 	     ______________	       ________
+	       |       |	    |		   |	      |        |
+	       | input |  demuxer   | encoded data |  muxer   | output |
+	       | file  | ---------> | packets	   | -------> | file   |
+	       |_______|	    |______________|	      |________|
+
+       Since there is no decoding or encoding, it is very fast and there is no
+       quality loss. However, it might not work in some cases because of many
+       factors. Applying filters is obviously also impossible, since filters
+       work on uncompressed data.
+
+   Loopback decoders
+       While decoders are normally associated with demuxer streams, it is also
+       possible to create "loopback" decoders that decode the output from some
+       encoder and allow it to be fed back to complex filtergraphs. This is
+       done with the "-dec" directive, which takes as a parameter the index of
+       the output stream that should be decoded. Every such directive creates
+       a new loopback decoder, indexed with successive integers starting at
+       zero. These indices should then be used to refer to loopback decoders
+       in complex filtergraph link labels, as described in the documentation
+       for -filter_complex.
+
+       E.g. the following example:
+
+	       ffmpeg -i INPUT					      \
+		 -map 0:v:0 -c:v libx264 -crf 45 -f null -	      \
+		 -dec 0:0 -filter_complex '[0:v][dec:0]hstack[stack]' \
+		 -map '[stack]' -c:v ffv1 OUTPUT
+
+       reads an input video and
+
+       o   (line 2) encodes it with "libx264" at low quality;
+
+       o   (line 3) decodes this encoded stream and places it side by side
+	   with the original input video;
+
+       o   (line 4) combined video is then losslessly encoded and written into
+	   OUTPUT.
+
+STREAM SELECTION
+       ffmpeg provides the "-map" option for manual control of stream
+       selection in each output file. Users can skip "-map" and let ffmpeg
+       perform automatic stream selection as described below. The "-vn / -an /
+       -sn / -dn" options can be used to skip inclusion of video, audio,
+       subtitle and data streams respectively, whether manually mapped or
+       automatically selected, except for those streams which are outputs of
+       complex filtergraphs.
+
+   Description
+       The sub-sections that follow describe the various rules that are
+       involved in stream selection.  The examples that follow next show how
+       these rules are applied in practice.
+
+       While every effort is made to accurately reflect the behavior of the
+       program, FFmpeg is under continuous development and the code may have
+       changed since the time of this writing.
+
+       Automatic stream selection
+
+       In the absence of any map options for a particular output file, ffmpeg
+       inspects the output format to check which type of streams can be
+       included in it, viz. video, audio and/or subtitles. For each acceptable
+       stream type, ffmpeg will pick one stream, when available, from among
+       all the inputs.
+
+       It will select that stream based upon the following criteria:
+
+       o   for video, it is the stream with the highest resolution,
+
+       o   for audio, it is the stream with the most channels,
+
+       o   for subtitles, it is the first subtitle stream found but there's a
+	   caveat.  The output format's default subtitle encoder can be either
+	   text-based or image-based, and only a subtitle stream of the same
+	   type will be chosen.
+
+       In the case where several streams of the same type rate equally, the
+       stream with the lowest index is chosen.
+
+       Data or attachment streams are not automatically selected and can only
+       be included using "-map".
+
+       Manual stream selection
+
+       When "-map" is used, only user-mapped streams are included in that
+       output file, with one possible exception for filtergraph outputs
+       described below.
+
+       Complex filtergraphs
+
+       If there are any complex filtergraph output streams with unlabeled
+       pads, they will be added to the first output file. This will lead to a
+       fatal error if the stream type is not supported by the output format.
+       In the absence of the map option, the inclusion of these streams leads
+       to the automatic stream selection of their types being skipped. If map
+       options are present, these filtergraph streams are included in addition
+       to the mapped streams.
+
+       Complex filtergraph output streams with labeled pads must be mapped
+       once and exactly once.
+
+       Stream handling
+
+       Stream handling is independent of stream selection, with an exception
+       for subtitles described below. Stream handling is set via the "-codec"
+       option addressed to streams within a specific output file. In
+       particular, codec options are applied by ffmpeg after the stream
+       selection process and thus do not influence the latter. If no "-codec"
+       option is specified for a stream type, ffmpeg will select the default
+       encoder registered by the output file muxer.
+
+       An exception exists for subtitles. If a subtitle encoder is specified
+       for an output file, the first subtitle stream found of any type, text
+       or image, will be included. ffmpeg does not validate if the specified
+       encoder can convert the selected stream or if the converted stream is
+       acceptable within the output format. This applies generally as well:
+       when the user sets an encoder manually, the stream selection process
+       cannot check if the encoded stream can be muxed into the output file.
+       If it cannot, ffmpeg will abort and all output files will fail to be
+       processed.
+
+   Examples
+       The following examples illustrate the behavior, quirks and limitations
+       of ffmpeg's stream selection methods.
+
+       They assume the following three input files.
+
+	       input file 'A.avi'
+		     stream 0: video 640x360
+		     stream 1: audio 2 channels
+
+	       input file 'B.mp4'
+		     stream 0: video 1920x1080
+		     stream 1: audio 2 channels
+		     stream 2: subtitles (text)
+		     stream 3: audio 5.1 channels
+		     stream 4: subtitles (text)
+
+	       input file 'C.mkv'
+		     stream 0: video 1280x720
+		     stream 1: audio 2 channels
+		     stream 2: subtitles (image)
+
+       Example: automatic stream selection
+
+	       ffmpeg -i A.avi -i B.mp4 out1.mkv out2.wav -map 1:a -c:a copy out3.mov
+
+       There are three output files specified, and for the first two, no
+       "-map" options are set, so ffmpeg will select streams for these two
+       files automatically.
+
+       out1.mkv is a Matroska container file and accepts video, audio and
+       subtitle streams, so ffmpeg will try to select one of each type.For
+       video, it will select "stream 0" from B.mp4, which has the highest
+       resolution among all the input video streams.For audio, it will select
+       "stream 3" from B.mp4, since it has the greatest number of channels.For
+       subtitles, it will select "stream 2" from B.mp4, which is the first
+       subtitle stream from among A.avi and B.mp4.
+
+       out2.wav accepts only audio streams, so only "stream 3" from B.mp4 is
+       selected.
+
+       For out3.mov, since a "-map" option is set, no automatic stream
+       selection will occur. The "-map 1:a" option will select all audio
+       streams from the second input B.mp4. No other streams will be included
+       in this output file.
+
+       For the first two outputs, all included streams will be transcoded. The
+       encoders chosen will be the default ones registered by each output
+       format, which may not match the codec of the selected input streams.
+
+       For the third output, codec option for audio streams has been set to
+       "copy", so no decoding-filtering-encoding operations will occur, or can
+       occur.  Packets of selected streams shall be conveyed from the input
+       file and muxed within the output file.
+
+       Example: automatic subtitles selection
+
+	       ffmpeg -i C.mkv out1.mkv -c:s dvdsub -an out2.mkv
+
+       Although out1.mkv is a Matroska container file which accepts subtitle
+       streams, only a video and audio stream shall be selected. The subtitle
+       stream of C.mkv is image-based and the default subtitle encoder of the
+       Matroska muxer is text-based, so a transcode operation for the
+       subtitles is expected to fail and hence the stream isn't selected.
+       However, in out2.mkv, a subtitle encoder is specified in the command
+       and so, the subtitle stream is selected, in addition to the video
+       stream. The presence of "-an" disables audio stream selection for
+       out2.mkv.
+
+       Example: unlabeled filtergraph outputs
+
+	       ffmpeg -i A.avi -i C.mkv -i B.mp4 -filter_complex "overlay" out1.mp4 out2.srt
+
+       A filtergraph is setup here using the "-filter_complex" option and
+       consists of a single video filter. The "overlay" filter requires
+       exactly two video inputs, but none are specified, so the first two
+       available video streams are used, those of A.avi and C.mkv. The output
+       pad of the filter has no label and so is sent to the first output file
+       out1.mp4. Due to this, automatic selection of the video stream is
+       skipped, which would have selected the stream in B.mp4. The audio
+       stream with most channels viz. "stream 3" in B.mp4, is chosen
+       automatically. No subtitle stream is chosen however, since the MP4
+       format has no default subtitle encoder registered, and the user hasn't
+       specified a subtitle encoder.
+
+       The 2nd output file, out2.srt, only accepts text-based subtitle
+       streams. So, even though the first subtitle stream available belongs to
+       C.mkv, it is image-based and hence skipped.  The selected stream,
+       "stream 2" in B.mp4, is the first text-based subtitle stream.
+
+       Example: labeled filtergraph outputs
+
+	       ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0[outv];overlay;aresample" \
+		      -map '[outv]' -an        out1.mp4 \
+					       out2.mkv \
+		      -map '[outv]' -map 1:a:0 out3.mkv
+
+       The above command will fail, as the output pad labelled "[outv]" has
+       been mapped twice.  None of the output files shall be processed.
+
+	       ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0[outv];overlay;aresample" \
+		      -an	 out1.mp4 \
+				 out2.mkv \
+		      -map 1:a:0 out3.mkv
+
+       This command above will also fail as the hue filter output has a label,
+       "[outv]", and hasn't been mapped anywhere.
+
+       The command should be modified as follows,
+
+	       ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0,split=2[outv1][outv2];overlay;aresample" \
+		       -map '[outv1]' -an	 out1.mp4 \
+						 out2.mkv \
+		       -map '[outv2]' -map 1:a:0 out3.mkv
+
+       The video stream from B.mp4 is sent to the hue filter, whose output is
+       cloned once using the split filter, and both outputs labelled. Then a
+       copy each is mapped to the first and third output files.
+
+       The overlay filter, requiring two video inputs, uses the first two
+       unused video streams. Those are the streams from A.avi and C.mkv. The
+       overlay output isn't labelled, so it is sent to the first output file
+       out1.mp4, regardless of the presence of the "-map" option.
+
+       The aresample filter is sent the first unused audio stream, that of
+       A.avi. Since this filter output is also unlabelled, it too is mapped to
+       the first output file. The presence of "-an" only suppresses automatic
+       or manual stream selection of audio streams, not outputs sent from
+       filtergraphs. Both these mapped streams shall be ordered before the
+       mapped stream in out1.mp4.
+
+       The video, audio and subtitle streams mapped to "out2.mkv" are entirely
+       determined by automatic stream selection.
+
+       out3.mkv consists of the cloned video output from the hue filter and
+       the first audio stream from B.mp4.
+
+OPTIONS
+       All the numerical options, if not specified otherwise, accept a string
+       representing a number as input, which may be followed by one of the SI
+       unit prefixes, for example: 'K', 'M', or 'G'.
+
+       If 'i' is appended to the SI unit prefix, the complete prefix will be
+       interpreted as a unit prefix for binary multiples, which are based on
+       powers of 1024 instead of powers of 1000. Appending 'B' to the SI unit
+       prefix multiplies the value by 8. This allows using, for example: 'KB',
+       'MiB', 'G' and 'B' as number suffixes.
+
+       Options which do not take arguments are boolean options, and set the
+       corresponding value to true. They can be set to false by prefixing the
+       option name with "no". For example using "-nofoo" will set the boolean
+       option with name "foo" to false.
+
+       Options that take arguments support a special syntax where the argument
+       given on the command line is interpreted as a path to the file from
+       which the actual argument value is loaded. To use this feature, add a
+       forward slash '/' immediately before the option name (after the leading
+       dash). E.g.
+
+	       ffmpeg -i INPUT -/filter:v filter.script OUTPUT
+
+       will load a filtergraph description from the file named filter.script.
+
+   Stream specifiers
+       Some options are applied per-stream, e.g. bitrate or codec. Stream
+       specifiers are used to precisely specify which stream(s) a given option
+       belongs to.
+
+       A stream specifier is a string generally appended to the option name
+       and separated from it by a colon. E.g. "-codec:a:1 ac3" contains the
+       "a:1" stream specifier, which matches the second audio stream.
+       Therefore, it would select the ac3 codec for the second audio stream.
+
+       A stream specifier can match several streams, so that the option is
+       applied to all of them. E.g. the stream specifier in "-b:a 128k"
+       matches all audio streams.
+
+       An empty stream specifier matches all streams. For example, "-codec
+       copy" or "-codec: copy" would copy all the streams without reencoding.
+
+       Possible forms of stream specifiers are:
+
+       stream_index
+	   Matches the stream with this index. E.g. "-threads:1 4" would set
+	   the thread count for the second stream to 4. If stream_index is
+	   used as an additional stream specifier (see below), then it selects
+	   stream number stream_index from the matching streams. Stream
+	   numbering is based on the order of the streams as detected by
+	   libavformat except when a stream group specifier or program ID is
+	   also specified. In this case it is based on the ordering of the
+	   streams in the group or program.
+
+       stream_type[:additional_stream_specifier]
+	   stream_type is one of following: 'v' or 'V' for video, 'a' for
+	   audio, 's' for subtitle, 'd' for data, and 't' for attachments. 'v'
+	   matches all video streams, 'V' only matches video streams which are
+	   not attached pictures, video thumbnails or cover arts. If
+	   additional_stream_specifier is used, then it matches streams which
+	   both have this type and match the additional_stream_specifier.
+	   Otherwise, it matches all streams of the specified type.
+
+       g:group_specifier[:additional_stream_specifier]
+	   Matches streams which are in the group with the specifier
+	   group_specifier.  if additional_stream_specifier is used, then it
+	   matches streams which both are part of the group and match the
+	   additional_stream_specifier.  group_specifier may be one of the
+	   following:
+
+	   group_index
+	       Match the stream with this group index.
+
+	   #group_id or i:group_id
+	       Match the stream with this group id.
+
+       p:program_id[:additional_stream_specifier]
+	   Matches streams which are in the program with the id program_id. If
+	   additional_stream_specifier is used, then it matches streams which
+	   both are part of the program and match the
+	   additional_stream_specifier.
+
+       #stream_id or i:stream_id
+	   Match the stream by stream id (e.g. PID in MPEG-TS container).
+
+       m:key[:value]
+	   Matches streams with the metadata tag key having the specified
+	   value. If value is not given, matches streams that contain the
+	   given tag with any value.
+
+       u   Matches streams with usable configuration, the codec must be
+	   defined and the essential information such as video dimension or
+	   audio sample rate must be present.
+
+	   Note that in ffmpeg, matching by metadata will only work properly
+	   for input files.
+
+   Generic options
+       These options are shared amongst the ff* tools.
+
+       -L  Show license.
+
+       -h, -?, -help, --help [arg]
+	   Show help. An optional parameter may be specified to print help
+	   about a specific item. If no argument is specified, only basic (non
+	   advanced) tool options are shown.
+
+	   Possible values of arg are:
+
+	   long
+	       Print advanced tool options in addition to the basic tool
+	       options.
+
+	   full
+	       Print complete list of options, including shared and private
+	       options for encoders, decoders, demuxers, muxers, filters, etc.
+
+	   decoder=decoder_name
+	       Print detailed information about the decoder named
+	       decoder_name. Use the -decoders option to get a list of all
+	       decoders.
+
+	   encoder=encoder_name
+	       Print detailed information about the encoder named
+	       encoder_name. Use the -encoders option to get a list of all
+	       encoders.
+
+	   demuxer=demuxer_name
+	       Print detailed information about the demuxer named
+	       demuxer_name. Use the -formats option to get a list of all
+	       demuxers and muxers.
+
+	   muxer=muxer_name
+	       Print detailed information about the muxer named muxer_name.
+	       Use the -formats option to get a list of all muxers and
+	       demuxers.
+
+	   filter=filter_name
+	       Print detailed information about the filter named filter_name.
+	       Use the -filters option to get a list of all filters.
+
+	   bsf=bitstream_filter_name
+	       Print detailed information about the bitstream filter named
+	       bitstream_filter_name.  Use the -bsfs option to get a list of
+	       all bitstream filters.
+
+	   protocol=protocol_name
+	       Print detailed information about the protocol named
+	       protocol_name.  Use the -protocols option to get a list of all
+	       protocols.
+
+       -version
+	   Show version.
+
+       -buildconf
+	   Show the build configuration, one option per line.
+
+       -formats
+	   Show available formats (including devices).
+
+       -demuxers
+	   Show available demuxers.
+
+       -muxers
+	   Show available muxers.
+
+       -devices
+	   Show available devices.
+
+       -codecs
+	   Show all codecs known to libavcodec.
+
+	   Note that the term 'codec' is used throughout this documentation as
+	   a shortcut for what is more correctly called a media bitstream
+	   format.
+
+       -decoders
+	   Show available decoders.
+
+       -encoders
+	   Show all available encoders.
+
+       -bsfs
+	   Show available bitstream filters.
+
+       -protocols
+	   Show available protocols.
+
+       -filters
+	   Show available libavfilter filters.
+
+       -pix_fmts
+	   Show available pixel formats.
+
+       -sample_fmts
+	   Show available sample formats.
+
+       -layouts
+	   Show channel names and standard channel layouts.
+
+       -dispositions
+	   Show stream dispositions.
+
+       -colors
+	   Show recognized color names.
+
+       -sources device[,opt1=val1[,opt2=val2]...]
+	   Show autodetected sources of the input device.  Some devices may
+	   provide system-dependent source names that cannot be autodetected.
+	   The returned list cannot be assumed to be always complete.
+
+		   ffmpeg -sources pulse,server=192.168.0.4
+
+       -sinks device[,opt1=val1[,opt2=val2]...]
+	   Show autodetected sinks of the output device.  Some devices may
+	   provide system-dependent sink names that cannot be autodetected.
+	   The returned list cannot be assumed to be always complete.
+
+		   ffmpeg -sinks pulse,server=192.168.0.4
+
+       -loglevel [flags+]loglevel | -v [flags+]loglevel
+	   Set logging level and flags used by the library.
+
+	   The optional flags prefix can consist of the following values:
+
+	   repeat
+	       Indicates that repeated log output should not be compressed to
+	       the first line and the "Last message repeated n times" line
+	       will be omitted.
+
+	   level
+	       Indicates that log output should add a "[level]" prefix to each
+	       message line. This can be used as an alternative to log
+	       coloring, e.g. when dumping the log to file.
+
+	   Flags can also be used alone by adding a '+'/'-' prefix to
+	   set/reset a single flag without affecting other flags or changing
+	   loglevel. When setting both flags and loglevel, a '+' separator is
+	   expected between the last flags value and before loglevel.
+
+	   loglevel is a string or a number containing one of the following
+	   values:
+
+	   quiet, -8
+	       Show nothing at all; be silent.
+
+	   panic, 0
+	       Only show fatal errors which could lead the process to crash,
+	       such as an assertion failure. This is not currently used for
+	       anything.
+
+	   fatal, 8
+	       Only show fatal errors. These are errors after which the
+	       process absolutely cannot continue.
+
+	   error, 16
+	       Show all errors, including ones which can be recovered from.
+
+	   warning, 24
+	       Show all warnings and errors. Any message related to possibly
+	       incorrect or unexpected events will be shown.
+
+	   info, 32
+	       Show informative messages during processing. This is in
+	       addition to warnings and errors. This is the default value.
+
+	   verbose, 40
+	       Same as "info", except more verbose.
+
+	   debug, 48
+	       Show everything, including debugging information.
+
+	   trace, 56
+
+	   For example to enable repeated log output, add the "level" prefix,
+	   and set loglevel to "verbose":
+
+		   ffmpeg -loglevel repeat+level+verbose -i input output
+
+	   Another example that enables repeated log output without affecting
+	   current state of "level" prefix flag or loglevel:
+
+		   ffmpeg [...] -loglevel +repeat
+
+	   By default the program logs to stderr. If coloring is supported by
+	   the terminal, colors are used to mark errors and warnings. Log
+	   coloring can be disabled setting the environment variable
+	   AV_LOG_FORCE_NOCOLOR, or can be forced setting the environment
+	   variable AV_LOG_FORCE_COLOR.
+
+       -report
+	   Dump full command line and log output to a file named
+	   "program-YYYYMMDD-HHMMSS.log" in the current directory.  This file
+	   can be useful for bug reports.  It also implies "-loglevel debug".
+
+	   Setting the environment variable FFREPORT to any value has the same
+	   effect. If the value is a ':'-separated key=value sequence, these
+	   options will affect the report; option values must be escaped if
+	   they contain special characters or the options delimiter ':' (see
+	   the ``Quoting and escaping'' section in the ffmpeg-utils manual).
+
+	   The following options are recognized:
+
+	   file
+	       set the file name to use for the report; %p is expanded to the
+	       name of the program, %t is expanded to a timestamp, "%%" is
+	       expanded to a plain "%"
+
+	   level
+	       set the log verbosity level using a numerical value (see
+	       "-loglevel").
+
+	   For example, to output a report to a file named ffreport.log using
+	   a log level of 32 (alias for log level "info"):
+
+		   FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output
+
+	   Errors in parsing the environment variable are not fatal, and will
+	   not appear in the report.
+
+       -hide_banner
+	   Suppress printing banner.
+
+	   All FFmpeg tools will normally show a copyright notice, build
+	   options and library versions. This option can be used to suppress
+	   printing this information.
+
+       -cpuflags flags (global)
+	   Allows setting and clearing cpu flags. This option is intended for
+	   testing. Do not use it unless you know what you're doing.
+
+		   ffmpeg -cpuflags -sse+mmx ...
+		   ffmpeg -cpuflags mmx ...
+		   ffmpeg -cpuflags 0 ...
+
+	   Possible flags for this option are:
+
+	   x86
+	       mmx
+	       mmxext
+	       sse
+	       sse2
+	       sse2slow
+	       sse3
+	       sse3slow
+	       ssse3
+	       atom
+	       sse4.1
+	       sse4.2
+	       avx
+	       avx2
+	       xop
+	       fma3
+	       fma4
+	       3dnow
+	       3dnowext
+	       bmi1
+	       bmi2
+	       cmov
+	   ARM
+	       armv5te
+	       armv6
+	       armv6t2
+	       vfp
+	       vfpv3
+	       neon
+	       setend
+	   AArch64
+	       armv8
+	       vfp
+	       neon
+	   PowerPC
+	       altivec
+	   Specific Processors
+	       pentium2
+	       pentium3
+	       pentium4
+	       k6
+	       k62
+	       athlon
+	       athlonxp
+	       k8
+       -cpucount count (global)
+	   Override detection of CPU count. This option is intended for
+	   testing. Do not use it unless you know what you're doing.
+
+		   ffmpeg -cpucount 2
+
+       -max_alloc bytes
+	   Set the maximum size limit for allocating a block on the heap by
+	   ffmpeg's family of malloc functions. Exercise extreme caution when
+	   using this option. Don't use if you do not understand the full
+	   consequence of doing so.  Default is INT_MAX.
+
+   AVOptions
+       These options are provided directly by the libavformat, libavdevice and
+       libavcodec libraries. To see the list of available AVOptions, use the
+       -help option. They are separated into two categories:
+
+       generic
+	   These options can be set for any container, codec or device.
+	   Generic options are listed under AVFormatContext options for
+	   containers/devices and under AVCodecContext options for codecs.
+
+       private
+	   These options are specific to the given container, device or codec.
+	   Private options are listed under their corresponding
+	   containers/devices/codecs.
+
+       For example to write an ID3v2.3 header instead of a default ID3v2.4 to
+       an MP3 file, use the id3v2_version private option of the MP3 muxer:
+
+	       ffmpeg -i input.flac -id3v2_version 3 out.mp3
+
+       All codec AVOptions are per-stream, and thus a stream specifier should
+       be attached to them:
+
+	       ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
+
+       In the above example, a multichannel audio stream is mapped twice for
+       output.	The first instance is encoded with codec ac3 and bitrate 640k.
+       The second instance is downmixed to 2 channels and encoded with codec
+       aac. A bitrate of 128k is specified for it using absolute index of the
+       output stream.
+
+       Note: the -nooption syntax cannot be used for boolean AVOptions, use
+       -option 0/-option 1.
+
+       Note: the old undocumented way of specifying per-stream AVOptions by
+       prepending v/a/s to the options name is now obsolete and will be
+       removed soon.
+
+   Main options
+       -f fmt (input/output)
+	   Force input or output file format. The format is normally auto
+	   detected for input files and guessed from the file extension for
+	   output files, so this option is not needed in most cases.
+
+       -i url (input)
+	   input file url
+
+       -y (global)
+	   Overwrite output files without asking.
+
+       -n (global)
+	   Do not overwrite output files, and exit immediately if a specified
+	   output file already exists.
+
+       -stream_loop number (input)
+	   Set number of times input stream shall be looped. Loop 0 means no
+	   loop, loop -1 means infinite loop.
+
+       -recast_media (global)
+	   Allow forcing a decoder of a different media type than the one
+	   detected or designated by the demuxer. Useful for decoding media
+	   data muxed as data streams.
+
+       -c[:stream_specifier] codec (input/output,per-stream)
+       -codec[:stream_specifier] codec (input/output,per-stream)
+	   Select an encoder (when used before an output file) or a decoder
+	   (when used before an input file) for one or more streams. codec is
+	   the name of a decoder/encoder or a special value "copy" (output
+	   only) to indicate that the stream is not to be re-encoded.
+
+	   For example
+
+		   ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
+
+	   encodes all video streams with libx264 and copies all audio
+	   streams.
+
+	   For each stream, the last matching "c" option is applied, so
+
+		   ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
+
+	   will copy all the streams except the second video, which will be
+	   encoded with libx264, and the 138th audio, which will be encoded
+	   with libvorbis.
+
+       -t duration (input/output)
+	   When used as an input option (before "-i"), limit the duration of
+	   data read from the input file.
+
+	   When used as an output option (before an output url), stop writing
+	   the output after its duration reaches duration.
+
+	   duration must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.
+
+	   -to and -t are mutually exclusive and -t has priority.
+
+       -to position (input/output)
+	   Stop writing the output or reading the input at position.  position
+	   must be a time duration specification, see the Time duration
+	   section in the ffmpeg-utils(1) manual.
+
+	   -to and -t are mutually exclusive and -t has priority.
+
+       -fs limit_size (output)
+	   Set the file size limit, expressed in bytes. No further chunk of
+	   bytes is written after the limit is exceeded. The size of the
+	   output file is slightly more than the requested file size.
+
+       -ss position (input/output)
+	   When used as an input option (before "-i"), seeks in this input
+	   file to position. Note that in most formats it is not possible to
+	   seek exactly, so ffmpeg will seek to the closest seek point before
+	   position.  When transcoding and -accurate_seek is enabled (the
+	   default), this extra segment between the seek point and position
+	   will be decoded and discarded. When doing stream copy or when
+	   -noaccurate_seek is used, it will be preserved.
+
+	   When used as an output option (before an output url), decodes but
+	   discards input until the timestamps reach position.
+
+	   position must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.
+
+       -sseof position (input)
+	   Like the "-ss" option but relative to the "end of file". That is
+	   negative values are earlier in the file, 0 is at EOF.
+
+       -isync input_index (input)
+	   Assign an input as a sync source.
+
+	   This will take the difference between the start times of the target
+	   and reference inputs and offset the timestamps of the target file
+	   by that difference. The source timestamps of the two inputs should
+	   derive from the same clock source for expected results. If "copyts"
+	   is set then "start_at_zero" must also be set. If either of the
+	   inputs has no starting timestamp then no sync adjustment is made.
+
+	   Acceptable values are those that refer to a valid ffmpeg input
+	   index. If the sync reference is the target index itself or -1, then
+	   no adjustment is made to target timestamps. A sync reference may
+	   not itself be synced to any other input.
+
+	   Default value is -1.
+
+       -itsoffset offset (input)
+	   Set the input time offset.
+
+	   offset must be a time duration specification, see the Time duration
+	   section in the ffmpeg-utils(1) manual.
+
+	   The offset is added to the timestamps of the input files.
+	   Specifying a positive offset means that the corresponding streams
+	   are delayed by the time duration specified in offset.
+
+       -itsscale scale (input,per-stream)
+	   Rescale input timestamps. scale should be a floating point number.
+
+       -timestamp date (output)
+	   Set the recording timestamp in the container.
+
+	   date must be a date specification, see the Date section in the
+	   ffmpeg-utils(1) manual.
+
+       -metadata[:metadata_specifier] key=value (output,per-metadata)
+	   Set a metadata key/value pair.
+
+	   An optional metadata_specifier may be given to set metadata on
+	   streams, chapters or programs. See "-map_metadata" documentation
+	   for details.
+
+	   This option overrides metadata set with "-map_metadata". It is also
+	   possible to delete metadata by using an empty value.
+
+	   For example, for setting the title in the output file:
+
+		   ffmpeg -i in.avi -metadata title="my title" out.flv
+
+	   To set the language of the first audio stream:
+
+		   ffmpeg -i INPUT -metadata:s:a:0 language=eng OUTPUT
+
+       -disposition[:stream_specifier] value (output,per-stream)
+	   Sets the disposition for a stream.
+
+	   By default, the disposition is copied from the input stream, unless
+	   the output stream this option applies to is fed by a complex
+	   filtergraph - in that case the disposition is unset by default.
+
+	   value is a sequence of items separated by '+' or '-'. The first
+	   item may also be prefixed with '+' or '-', in which case this
+	   option modifies the default value. Otherwise (the first item is not
+	   prefixed) this options overrides the default value. A '+' prefix
+	   adds the given disposition, '-' removes it. It is also possible to
+	   clear the disposition by setting it to 0.
+
+	   If no "-disposition" options were specified for an output file,
+	   ffmpeg will automatically set the 'default' disposition on the
+	   first stream of each type, when there are multiple streams of this
+	   type in the output file and no stream of that type is already
+	   marked as default.
+
+	   The "-dispositions" option lists the known dispositions.
+
+	   For example, to make the second audio stream the default stream:
+
+		   ffmpeg -i in.mkv -c copy -disposition:a:1 default out.mkv
+
+	   To make the second subtitle stream the default stream and remove
+	   the default disposition from the first subtitle stream:
+
+		   ffmpeg -i in.mkv -c copy -disposition:s:0 0 -disposition:s:1 default out.mkv
+
+	   To add an embedded cover/thumbnail:
+
+		   ffmpeg -i in.mp4 -i IMAGE -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attached_pic out.mp4
+
+	   Not all muxers support embedded thumbnails, and those who do, only
+	   support a few formats, like JPEG or PNG.
+
+       -program
+       [title=title:][program_num=program_num:]st=stream[:st=stream...]
+       (output)
+	   Creates a program with the specified title, program_num and adds
+	   the specified stream(s) to it.
+
+       -stream_group
+       type=type:st=stream[:st=stream][:stg=stream_group][:id=stream_group_id...]
+       (output)
+	   Creates a stream group of the specified type, stream_group_id and
+	   adds the specified stream(s) and/or previously defined
+	   stream_group(s) to it.
+
+	   type can be one of the following:
+
+	   iamf_audio_element
+	       Groups streams that belong to the same IAMF Audio Element
+
+	       For this group type, the following options are available
+
+	       audio_element_type
+		   The Audio Element type. The following values are supported:
+
+		   channel
+		       Scalable channel audio representation
+
+		   scene
+		       Ambisonics representation
+
+	       demixing
+		   Demixing information used to reconstruct a scalable channel
+		   audio representation.  This option must be separated from
+		   the rest with a ',', and takes the following key=value
+		   options
+
+		   parameter_id
+		       An identifier parameters blocks in frames may refer to
+
+		   dmixp_mode
+		       A pre-defined combination of demixing parameters
+
+	       recon_gain
+		   Recon gain information used to reconstruct a scalable
+		   channel audio representation.  This option must be
+		   separated from the rest with a ',', and takes the following
+		   key=value options
+
+		   parameter_id
+		       An identifier parameters blocks in frames may refer to
+
+	       layer
+		   A layer defining a Channel Layout in the Audio Element.
+		   This option must be separated from the rest with a ','.
+		   Several ',' separated entries can be defined, and at least
+		   one must be set.
+
+		   It takes the following ":"-separated key=value options
+
+		   ch_layout
+		       The layer's channel layout
+
+		   flags
+		       The following flags are available:
+
+		       recon_gain
+			   Wether to signal if recon_gain is present as
+			   metadata in parameter blocks within frames
+
+		   output_gain
+		   output_gain_flags
+		       Which channels output_gain applies to. The following
+		       flags are available:
+
+		       FL
+		       FR
+		       BL
+		       BR
+		       TFL
+		       TFR
+		   ambisonics_mode
+		       The ambisonics mode. This has no effect if
+		       audio_element_type is set to channel.
+
+		       The following values are supported:
+
+		       mono
+			   Each ambisonics channel is coded as an individual
+			   mono stream in the group
+
+	       default_w
+		   Default weight value
+
+	   iamf_mix_presentation
+	       Groups streams that belong to all IAMF Audio Element the same
+	       IAMF Mix Presentation references
+
+	       For this group type, the following options are available
+
+	       submix
+		   A sub-mix within the Mix Presentation.  This option must be
+		   separated from the rest with a ','. Several ',' separated
+		   entries can be defined, and at least one must be set.
+
+		   It takes the following ":"-separated key=value options
+
+		   parameter_id
+		       An identifier parameters blocks in frames may refer to,
+		       for post-processing the mixed audio signal to generate
+		       the audio signal for playback
+
+		   parameter_rate
+		       The sample rate duration fields in parameters blocks in
+		       frames that refer to this parameter_id are expressed as
+
+		   default_mix_gain
+		       Default mix gain value to apply when there are no
+		       parameter blocks sharing the same parameter_id for a
+		       given frame
+
+		   element
+		       References an Audio Element used in this Mix
+		       Presentation to generate the final output audio signal
+		       for playback.  This option must be separated from the
+		       rest with a '|'. Several '|' separated entries can be
+		       defined, and at least one must be set.
+
+		       It takes the following ":"-separated key=value options:
+
+		       stg The stream_group_id for an Audio Element which this
+			   sub-mix refers to
+
+		       parameter_id
+			   An identifier parameters blocks in frames may refer
+			   to, for applying any processing to the referenced
+			   and rendered Audio Element before being summed with
+			   other processed Audio Elements
+
+		       parameter_rate
+			   The sample rate duration fields in parameters
+			   blocks in frames that refer to this parameter_id
+			   are expressed as
+
+		       default_mix_gain
+			   Default mix gain value to apply when there are no
+			   parameter blocks sharing the same parameter_id for
+			   a given frame
+
+		       annotations
+			   A key=value string describing the sub-mix element
+			   where "key" is a string conforming to BCP-47 that
+			   specifies the language for the "value" string.
+			   "key" must be the same as the one in the mix's
+			   annotations
+
+		       headphones_rendering_mode
+			   Indicates whether the input channel-based Audio
+			   Element is rendered to stereo loudspeakers or
+			   spatialized with a binaural renderer when played
+			   back on headphones.	This has no effect if the
+			   referenced Audio Element's audio_element_type is
+			   set to channel.
+
+			   The following values are supported:
+
+			   stereo
+			   binaural
+		   layout
+		       Specifies the layouts for this sub-mix on which the
+		       loudness information was measured.  This option must be
+		       separated from the rest with a '|'. Several '|'
+		       separated entries can be defined, and at least one must
+		       be set.
+
+		       It takes the following ":"-separated key=value options:
+
+		       layout_type
+			   loudspeakers
+			       The layout follows the loudspeaker sound system
+			       convention of ITU-2051-3.
+
+			   binaural
+			       The layout is binaural.
+
+		       sound_system
+			   Channel layout matching one of Sound Systems A to J
+			   of ITU-2051-3, plus 7.1.2 and 3.1.2 This has no
+			   effect if layout_type is set to binaural.
+
+		       integrated_loudness
+			   The program integrated loudness information, as
+			   defined in ITU-1770-4.
+
+		       digital_peak
+			   The digital (sampled) peak value of the audio
+			   signal, as defined in ITU-1770-4.
+
+		       true_peak
+			   The true peak of the audio signal, as defined in
+			   ITU-1770-4.
+
+		       dialog_anchored_loudness
+			   The Dialogue loudness information, as defined in
+			   ITU-1770-4.
+
+		       album_anchored_loudness
+			   The Album loudness information, as defined in
+			   ITU-1770-4.
+
+	       annotations
+		   A key=value string string describing the mix where "key" is
+		   a string conforming to BCP-47 that specifies the language
+		   for the "value" string. "key" must be the same as the ones
+		   in all sub-mix element's annotationss
+
+       -target type (output)
+	   Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50"). type
+	   may be prefixed with "pal-", "ntsc-" or "film-" to use the
+	   corresponding standard. All the format options (bitrate, codecs,
+	   buffer sizes) are then set automatically. You can just type:
+
+		   ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
+
+	   Nevertheless you can specify additional options as long as you know
+	   they do not conflict with the standard, as in:
+
+		   ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
+
+	   The parameters set for each target are as follows.
+
+	   VCD
+
+		   <pal>:
+		   -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
+		   -s 352x288 -r 25
+		   -codec:v mpeg1video -g 15 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
+		   -ar 44100 -ac 2
+		   -codec:a mp2 -b:a 224k
+
+		   <ntsc>:
+		   -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
+		   -s 352x240 -r 30000/1001
+		   -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
+		   -ar 44100 -ac 2
+		   -codec:a mp2 -b:a 224k
+
+		   <film>:
+		   -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
+		   -s 352x240 -r 24000/1001
+		   -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
+		   -ar 44100 -ac 2
+		   -codec:a mp2 -b:a 224k
+
+	   SVCD
+
+		   <pal>:
+		   -f svcd -packetsize 2324
+		   -s 480x576 -pix_fmt yuv420p -r 25
+		   -codec:v mpeg2video -g 15 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
+		   -ar 44100
+		   -codec:a mp2 -b:a 224k
+
+		   <ntsc>:
+		   -f svcd -packetsize 2324
+		   -s 480x480 -pix_fmt yuv420p -r 30000/1001
+		   -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
+		   -ar 44100
+		   -codec:a mp2 -b:a 224k
+
+		   <film>:
+		   -f svcd -packetsize 2324
+		   -s 480x480 -pix_fmt yuv420p -r 24000/1001
+		   -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
+		   -ar 44100
+		   -codec:a mp2 -b:a 224k
+
+	   DVD
+
+		   <pal>:
+		   -f dvd -muxrate 10080k -packetsize 2048
+		   -s 720x576 -pix_fmt yuv420p -r 25
+		   -codec:v mpeg2video -g 15 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
+		   -ar 48000
+		   -codec:a ac3 -b:a 448k
+
+		   <ntsc>:
+		   -f dvd -muxrate 10080k -packetsize 2048
+		   -s 720x480 -pix_fmt yuv420p -r 30000/1001
+		   -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
+		   -ar 48000
+		   -codec:a ac3 -b:a 448k
+
+		   <film>:
+		   -f dvd -muxrate 10080k -packetsize 2048
+		   -s 720x480 -pix_fmt yuv420p -r 24000/1001
+		   -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
+		   -ar 48000
+		   -codec:a ac3 -b:a 448k
+
+	   DV
+
+		   <pal>:
+		   -f dv
+		   -s 720x576 -pix_fmt yuv420p -r 25
+		   -ar 48000 -ac 2
+
+		   <ntsc>:
+		   -f dv
+		   -s 720x480 -pix_fmt yuv411p -r 30000/1001
+		   -ar 48000 -ac 2
+
+		   <film>:
+		   -f dv
+		   -s 720x480 -pix_fmt yuv411p -r 24000/1001
+		   -ar 48000 -ac 2
+
+	   The "dv50" target is identical to the "dv" target except that the
+	   pixel format set is "yuv422p" for all three standards.
+
+	   Any user-set value for a parameter above will override the target
+	   preset value. In that case, the output may not comply with the
+	   target standard.
+
+       -dn (input/output)
+	   As an input option, blocks all data streams of a file from being
+	   filtered or being automatically selected or mapped for any output.
+	   See "-discard" option to disable streams individually.
+
+	   As an output option, disables data recording i.e. automatic
+	   selection or mapping of any data stream. For full manual control
+	   see the "-map" option.
+
+       -dframes number (output)
+	   Set the number of data frames to output. This is an obsolete alias
+	   for "-frames:d", which you should use instead.
+
+       -frames[:stream_specifier] framecount (output,per-stream)
+	   Stop writing to the stream after framecount frames.
+
+       -q[:stream_specifier] q (output,per-stream)
+       -qscale[:stream_specifier] q (output,per-stream)
+	   Use fixed quality scale (VBR). The meaning of q/qscale is codec-
+	   dependent.  If qscale is used without a stream_specifier then it
+	   applies only to the video stream, this is to maintain compatibility
+	   with previous behavior and as specifying the same codec specific
+	   value to 2 different codecs that is audio and video generally is
+	   not what is intended when no stream_specifier is used.
+
+       -filter[:stream_specifier] filtergraph (output,per-stream)
+	   Create the filtergraph specified by filtergraph and use it to
+	   filter the stream.
+
+	   filtergraph is a description of the filtergraph to apply to the
+	   stream, and must have a single input and a single output of the
+	   same type of the stream. In the filtergraph, the input is
+	   associated to the label "in", and the output to the label "out".
+	   See the ffmpeg-filters manual for more information about the
+	   filtergraph syntax.
+
+	   See the -filter_complex option if you want to create filtergraphs
+	   with multiple inputs and/or outputs.
+
+       -reinit_filter[:stream_specifier] integer (input,per-stream)
+	   This boolean option determines if the filtergraph(s) to which this
+	   stream is fed gets reinitialized when input frame parameters change
+	   mid-stream. This option is enabled by default as most video and all
+	   audio filters cannot handle deviation in input frame properties.
+	   Upon reinitialization, existing filter state is lost, like e.g. the
+	   frame count "n" reference available in some filters. Any frames
+	   buffered at time of reinitialization are lost.  The properties
+	   where a change triggers reinitialization are, for video, frame
+	   resolution or pixel format; for audio, sample format, sample rate,
+	   channel count or channel layout.
+
+       -filter_threads nb_threads (global)
+	   Defines how many threads are used to process a filter pipeline.
+	   Each pipeline will produce a thread pool with this many threads
+	   available for parallel processing.  The default is the number of
+	   available CPUs.
+
+       -pre[:stream_specifier] preset_name (output,per-stream)
+	   Specify the preset for matching stream(s).
+
+       -stats (global)
+	   Print encoding progress/statistics. It is on by default, to
+	   explicitly disable it you need to specify "-nostats".
+
+       -stats_period time (global)
+	   Set period at which encoding progress/statistics are updated.
+	   Default is 0.5 seconds.
+
+       -progress url (global)
+	   Send program-friendly progress information to url.
+
+	   Progress information is written periodically and at the end of the
+	   encoding process. It is made of "key=value" lines. key consists of
+	   only alphanumeric characters. The last key of a sequence of
+	   progress information is always "progress".
+
+	   The update period is set using "-stats_period".
+
+       -stdin
+	   Enable interaction on standard input. On by default unless standard
+	   input is used as an input. To explicitly disable interaction you
+	   need to specify "-nostdin".
+
+	   Disabling interaction on standard input is useful, for example, if
+	   ffmpeg is in the background process group. Roughly the same result
+	   can be achieved with "ffmpeg ... < /dev/null" but it requires a
+	   shell.
+
+       -debug_ts (global)
+	   Print timestamp/latency information. It is off by default. This
+	   option is mostly useful for testing and debugging purposes, and the
+	   output format may change from one version to another, so it should
+	   not be employed by portable scripts.
+
+	   See also the option "-fdebug ts".
+
+       -attach filename (output)
+	   Add an attachment to the output file. This is supported by a few
+	   formats like Matroska for e.g. fonts used in rendering subtitles.
+	   Attachments are implemented as a specific type of stream, so this
+	   option will add a new stream to the file. It is then possible to
+	   use per-stream options on this stream in the usual way. Attachment
+	   streams created with this option will be created after all the
+	   other streams (i.e. those created with "-map" or automatic
+	   mappings).
+
+	   Note that for Matroska you also have to set the mimetype metadata
+	   tag:
+
+		   ffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv
+
+	   (assuming that the attachment stream will be third in the output
+	   file).
+
+       -dump_attachment[:stream_specifier] filename (input,per-stream)
+	   Extract the matching attachment stream into a file named filename.
+	   If filename is empty, then the value of the "filename" metadata tag
+	   will be used.
+
+	   E.g. to extract the first attachment to a file named 'out.ttf':
+
+		   ffmpeg -dump_attachment:t:0 out.ttf -i INPUT
+
+	   To extract all attachments to files determined by the "filename"
+	   tag:
+
+		   ffmpeg -dump_attachment:t "" -i INPUT
+
+	   Technical note -- attachments are implemented as codec extradata,
+	   so this option can actually be used to extract extradata from any
+	   stream, not just attachments.
+
+   Video Options
+       -vframes number (output)
+	   Set the number of video frames to output. This is an obsolete alias
+	   for "-frames:v", which you should use instead.
+
+       -r[:stream_specifier] fps (input/output,per-stream)
+	   Set frame rate (Hz value, fraction or abbreviation).
+
+	   As an input option, ignore any timestamps stored in the file and
+	   instead generate timestamps assuming constant frame rate fps.  This
+	   is not the same as the -framerate option used for some input
+	   formats like image2 or v4l2 (it used to be the same in older
+	   versions of FFmpeg).  If in doubt use -framerate instead of the
+	   input option -r.
+
+	   As an output option:
+
+	   video encoding
+	       Duplicate or drop frames right before encoding them to achieve
+	       constant output frame rate fps.
+
+	   video streamcopy
+	       Indicate to the muxer that fps is the stream frame rate. No
+	       data is dropped or duplicated in this case. This may produce
+	       invalid files if fps does not match the actual stream frame
+	       rate as determined by packet timestamps.  See also the "setts"
+	       bitstream filter.
+
+       -fpsmax[:stream_specifier] fps (output,per-stream)
+	   Set maximum frame rate (Hz value, fraction or abbreviation).
+
+	   Clamps output frame rate when output framerate is auto-set and is
+	   higher than this value.  Useful in batch processing or when input
+	   framerate is wrongly detected as very high.	It cannot be set
+	   together with "-r". It is ignored during streamcopy.
+
+       -s[:stream_specifier] size (input/output,per-stream)
+	   Set frame size.
+
+	   As an input option, this is a shortcut for the video_size private
+	   option, recognized by some demuxers for which the frame size is
+	   either not stored in the file or is configurable -- e.g. raw video
+	   or video grabbers.
+
+	   As an output option, this inserts the "scale" video filter to the
+	   end of the corresponding filtergraph. Please use the "scale" filter
+	   directly to insert it at the beginning or some other place.
+
+	   The format is wxh (default - same as source).
+
+       -aspect[:stream_specifier] aspect (output,per-stream)
+	   Set the video display aspect ratio specified by aspect.
+
+	   aspect can be a floating point number string, or a string of the
+	   form num:den, where num and den are the numerator and denominator
+	   of the aspect ratio. For example "4:3", "16:9", "1.3333", and
+	   "1.7777" are valid argument values.
+
+	   If used together with -vcodec copy, it will affect the aspect ratio
+	   stored at container level, but not the aspect ratio stored in
+	   encoded frames, if it exists.
+
+       -display_rotation[:stream_specifier] rotation (input,per-stream)
+	   Set video rotation metadata.
+
+	   rotation is a decimal number specifying the amount in degree by
+	   which the video should be rotated counter-clockwise before being
+	   displayed.
+
+	   This option overrides the rotation/display transform metadata
+	   stored in the file, if any. When the video is being transcoded
+	   (rather than copied) and "-autorotate" is enabled, the video will
+	   be rotated at the filtering stage. Otherwise, the metadata will be
+	   written into the output file if the muxer supports it.
+
+	   If the "-display_hflip" and/or "-display_vflip" options are given,
+	   they are applied after the rotation specified by this option.
+
+       -display_hflip[:stream_specifier] (input,per-stream)
+	   Set whether on display the image should be horizontally flipped.
+
+	   See the "-display_rotation" option for more details.
+
+       -display_vflip[:stream_specifier] (input,per-stream)
+	   Set whether on display the image should be vertically flipped.
+
+	   See the "-display_rotation" option for more details.
+
+       -vn (input/output)
+	   As an input option, blocks all video streams of a file from being
+	   filtered or being automatically selected or mapped for any output.
+	   See "-discard" option to disable streams individually.
+
+	   As an output option, disables video recording i.e. automatic
+	   selection or mapping of any video stream. For full manual control
+	   see the "-map" option.
+
+       -vcodec codec (output)
+	   Set the video codec. This is an alias for "-codec:v".
+
+       -pass[:stream_specifier] n (output,per-stream)
+	   Select the pass number (1 or 2). It is used to do two-pass video
+	   encoding. The statistics of the video are recorded in the first
+	   pass into a log file (see also the option -passlogfile), and in the
+	   second pass that log file is used to generate the video at the
+	   exact requested bitrate.  On pass 1, you may just deactivate audio
+	   and set output to null, examples for Windows and Unix:
+
+		   ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
+		   ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
+
+       -passlogfile[:stream_specifier] prefix (output,per-stream)
+	   Set two-pass log file name prefix to prefix, the default file name
+	   prefix is ``ffmpeg2pass''. The complete file name will be
+	   PREFIX-N.log, where N is a number specific to the output stream
+
+       -vf filtergraph (output)
+	   Create the filtergraph specified by filtergraph and use it to
+	   filter the stream.
+
+	   This is an alias for "-filter:v", see the -filter option.
+
+       -autorotate
+	   Automatically rotate the video according to file metadata. Enabled
+	   by default, use -noautorotate to disable it.
+
+       -autoscale
+	   Automatically scale the video according to the resolution of first
+	   frame.  Enabled by default, use -noautoscale to disable it. When
+	   autoscale is disabled, all output frames of filter graph might not
+	   be in the same resolution and may be inadequate for some
+	   encoder/muxer. Therefore, it is not recommended to disable it
+	   unless you really know what you are doing.  Disable autoscale at
+	   your own risk.
+
+   Advanced Video options
+       -pix_fmt[:stream_specifier] format (input/output,per-stream)
+	   Set pixel format. Use "-pix_fmts" to show all the supported pixel
+	   formats.  If the selected pixel format can not be selected, ffmpeg
+	   will print a warning and select the best pixel format supported by
+	   the encoder.  If pix_fmt is prefixed by a "+", ffmpeg will exit
+	   with an error if the requested pixel format can not be selected,
+	   and automatic conversions inside filtergraphs are disabled.	If
+	   pix_fmt is a single "+", ffmpeg selects the same pixel format as
+	   the input (or graph output) and automatic conversions are disabled.
+
+       -sws_flags flags (input/output)
+	   Set default flags for the libswscale library. These flags are used
+	   by automatically inserted "scale" filters and those within simple
+	   filtergraphs, if not overridden within the filtergraph definition.
+
+	   See the ffmpeg-scaler manual for a list of scaler options.
+
+       -rc_override[:stream_specifier] override (output,per-stream)
+	   Rate control override for specific intervals, formatted as
+	   "int,int,int" list separated with slashes. Two first values are the
+	   beginning and end frame numbers, last one is quantizer to use if
+	   positive, or quality factor if negative.
+
+       -vstats
+	   Dump video coding statistics to vstats_HHMMSS.log. See the vstats
+	   file format section for the format description.
+
+       -vstats_file file
+	   Dump video coding statistics to file. See the vstats file format
+	   section for the format description.
+
+       -vstats_version file
+	   Specify which version of the vstats format to use. Default is 2.
+	   See the vstats file format section for the format description.
+
+       -vtag fourcc/tag (output)
+	   Force video tag/fourcc. This is an alias for "-tag:v".
+
+       -force_key_frames[:stream_specifier] time[,time...] (output,per-stream)
+       -force_key_frames[:stream_specifier] expr:expr (output,per-stream)
+       -force_key_frames[:stream_specifier] source (output,per-stream)
+	   force_key_frames can take arguments of the following form:
+
+	   time[,time...]
+	       If the argument consists of timestamps, ffmpeg will round the
+	       specified times to the nearest output timestamp as per the
+	       encoder time base and force a keyframe at the first frame
+	       having timestamp equal or greater than the computed timestamp.
+	       Note that if the encoder time base is too coarse, then the
+	       keyframes may be forced on frames with timestamps lower than
+	       the specified time.  The default encoder time base is the
+	       inverse of the output framerate but may be set otherwise via
+	       "-enc_time_base".
+
+	       If one of the times is ""chapters"[delta]", it is expanded into
+	       the time of the beginning of all chapters in the file, shifted
+	       by delta, expressed as a time in seconds.  This option can be
+	       useful to ensure that a seek point is present at a chapter mark
+	       or any other designated place in the output file.
+
+	       For example, to insert a key frame at 5 minutes, plus key
+	       frames 0.1 second before the beginning of every chapter:
+
+		       -force_key_frames 0:05:00,chapters-0.1
+
+	   expr:expr
+	       If the argument is prefixed with "expr:", the string expr is
+	       interpreted like an expression and is evaluated for each frame.
+	       A key frame is forced in case the evaluation is non-zero.
+
+	       The expression in expr can contain the following constants:
+
+	       n   the number of current processed frame, starting from 0
+
+	       n_forced
+		   the number of forced frames
+
+	       prev_forced_n
+		   the number of the previous forced frame, it is "NAN" when
+		   no keyframe was forced yet
+
+	       prev_forced_t
+		   the time of the previous forced frame, it is "NAN" when no
+		   keyframe was forced yet
+
+	       t   the time of the current processed frame
+
+	       For example to force a key frame every 5 seconds, you can
+	       specify:
+
+		       -force_key_frames expr:gte(t,n_forced*5)
+
+	       To force a key frame 5 seconds after the time of the last
+	       forced one, starting from second 13:
+
+		       -force_key_frames expr:if(isnan(prev_forced_t),gte(t,13),gte(t,prev_forced_t+5))
+
+	   source
+	       If the argument is "source", ffmpeg will force a key frame if
+	       the current frame being encoded is marked as a key frame in its
+	       source.	In cases where this particular source frame has to be
+	       dropped, enforce the next available frame to become a key frame
+	       instead.
+
+	   Note that forcing too many keyframes is very harmful for the
+	   lookahead algorithms of certain encoders: using fixed-GOP options
+	   or similar would be more efficient.
+
+       -copyinkf[:stream_specifier] (output,per-stream)
+	   When doing stream copy, copy also non-key frames found at the
+	   beginning.
+
+       -init_hw_device type[=name][:device[,key=value...]]
+	   Initialise a new hardware device of type type called name, using
+	   the given device parameters.  If no name is specified it will
+	   receive a default name of the form "type%d".
+
+	   The meaning of device and the following arguments depends on the
+	   device type:
+
+	   cuda
+	       device is the number of the CUDA device.
+
+	       The following options are recognized:
+
+	       primary_ctx
+		   If set to 1, uses the primary device context instead of
+		   creating a new one.
+
+	       Examples:
+
+	       -init_hw_device cuda:1
+		   Choose the second device on the system.
+
+	       -init_hw_device cuda:0,primary_ctx=1
+		   Choose the first device and use the primary device context.
+
+	   dxva2
+	       device is the number of the Direct3D 9 display adapter.
+
+	   d3d11va
+	       device is the number of the Direct3D 11 display adapter.  If
+	       not specified, it will attempt to use the default Direct3D 11
+	       display adapter or the first Direct3D 11 display adapter whose
+	       hardware VendorId is specified by vendor_id.
+
+	       Examples:
+
+	       -init_hw_device d3d11va
+		   Create a d3d11va device on the default Direct3D 11 display
+		   adapter.
+
+	       -init_hw_device d3d11va:1
+		   Create a d3d11va device on the Direct3D 11 display adapter
+		   specified by index 1.
+
+	       -init_hw_device d3d11va:,vendor_id=0x8086
+		   Create a d3d11va device on the first Direct3D 11 display
+		   adapter whose hardware VendorId is 0x8086.
+
+	   vaapi
+	       device is either an X11 display name, a DRM render node or a
+	       DirectX adapter index.  If not specified, it will attempt to
+	       open the default X11 display ($DISPLAY) and then the first DRM
+	       render node (/dev/dri/renderD128), or the default DirectX
+	       adapter on Windows.
+
+	       The following options are recognized:
+
+	       kernel_driver
+		   When device is not specified, use this option to specify
+		   the name of the kernel driver associated with the desired
+		   device. This option is available only when the hardware
+		   acceleration method drm and vaapi are enabled.
+
+	       Examples:
+
+	       -init_hw_device vaapi
+		   Create a vaapi device on the default device.
+
+	       -init_hw_device vaapi:/dev/dri/renderD129
+		   Create a vaapi device on DRM render node
+		   /dev/dri/renderD129.
+
+	       -init_hw_device vaapi:1
+		   Create a vaapi device on DirectX adapter 1.
+
+	       -init_hw_device vaapi:,kernel_driver=i915
+		   Create a vaapi device on a device associated with kernel
+		   driver i915.
+
+	   vdpau
+	       device is an X11 display name.  If not specified, it will
+	       attempt to open the default X11 display ($DISPLAY).
+
+	   qsv device selects a value in MFX_IMPL_*. Allowed values are:
+
+	       auto
+	       sw
+	       hw
+	       auto_any
+	       hw_any
+	       hw2
+	       hw3
+	       hw4
+
+	       If not specified, auto_any is used.  (Note that it may be
+	       easier to achieve the desired result for QSV by creating the
+	       platform-appropriate subdevice (dxva2 or d3d11va or vaapi) and
+	       then deriving a QSV device from that.)
+
+	       The following options are recognized:
+
+	       child_device
+		   Specify a DRM render node on Linux or DirectX adapter on
+		   Windows.
+
+	       child_device_type
+		   Choose platform-appropriate subdevice type. On Windows
+		   d3d11va is used as default subdevice type when
+		   "--enable-libvpl" is specified at configuration time, dxva2
+		   is used as default subdevice type when "--enable-libmfx" is
+		   specified at configuration time. On Linux user can use
+		   vaapi only as subdevice type.
+
+	       Examples:
+
+	       -init_hw_device qsv:hw,child_device=/dev/dri/renderD129
+		   Create a QSV device with MFX_IMPL_HARDWARE on DRM render
+		   node /dev/dri/renderD129.
+
+	       -init_hw_device qsv:hw,child_device=1
+		   Create a QSV device with MFX_IMPL_HARDWARE on DirectX
+		   adapter 1.
+
+	       -init_hw_device qsv:hw,child_device_type=d3d11va
+		   Choose the GPU subdevice with type d3d11va and create QSV
+		   device with MFX_IMPL_HARDWARE.
+
+	       -init_hw_device qsv:hw,child_device_type=dxva2
+		   Choose the GPU subdevice with type dxva2 and create QSV
+		   device with MFX_IMPL_HARDWARE.
+
+	       -init_hw_device qsv:hw,child_device=1,child_device_type=d3d11va
+		   Create a QSV device with MFX_IMPL_HARDWARE on DirectX
+		   adapter 1 with subdevice type d3d11va.
+
+	       -init_hw_device vaapi=va:/dev/dri/renderD129 -init_hw_device
+	       qsv=hw1@va
+		   Create a VAAPI device called va on /dev/dri/renderD129,
+		   then derive a QSV device called hw1 from device va.
+
+	   opencl
+	       device selects the platform and device as
+	       platform_index.device_index.
+
+	       The set of devices can also be filtered using the key-value
+	       pairs to find only devices matching particular platform or
+	       device strings.
+
+	       The strings usable as filters are:
+
+	       platform_profile
+	       platform_version
+	       platform_name
+	       platform_vendor
+	       platform_extensions
+	       device_name
+	       device_vendor
+	       driver_version
+	       device_version
+	       device_profile
+	       device_extensions
+	       device_type
+
+	       The indices and filters must together uniquely select a device.
+
+	       Examples:
+
+	       -init_hw_device opencl:0.1
+		   Choose the second device on the first platform.
+
+	       -init_hw_device opencl:,device_name=Foo9000
+		   Choose the device with a name containing the string
+		   Foo9000.
+
+	       -init_hw_device
+	       opencl:1,device_type=gpu,device_extensions=cl_khr_fp16
+		   Choose the GPU device on the second platform supporting the
+		   cl_khr_fp16 extension.
+
+	   vulkan
+	       If device is an integer, it selects the device by its index in
+	       a system-dependent list of devices.  If device is any other
+	       string, it selects the first device with a name containing that
+	       string as a substring.
+
+	       The following options are recognized:
+
+	       debug
+		   If set to 1, enables the validation layer, if installed.
+
+	       linear_images
+		   If set to 1, images allocated by the hwcontext will be
+		   linear and locally mappable.
+
+	       instance_extensions
+		   A plus separated list of additional instance extensions to
+		   enable.
+
+	       device_extensions
+		   A plus separated list of additional device extensions to
+		   enable.
+
+	       Examples:
+
+	       -init_hw_device vulkan:1
+		   Choose the second device on the system.
+
+	       -init_hw_device vulkan:RADV
+		   Choose the first device with a name containing the string
+		   RADV.
+
+	       -init_hw_device
+	       vulkan:0,instance_extensions=VK_KHR_wayland_surface+VK_KHR_xcb_surface
+		   Choose the first device and enable the Wayland and XCB
+		   instance extensions.
+
+       -init_hw_device type[=name]@source
+	   Initialise a new hardware device of type type called name, deriving
+	   it from the existing device with the name source.
+
+       -init_hw_device list
+	   List all hardware device types supported in this build of ffmpeg.
+
+       -filter_hw_device name
+	   Pass the hardware device called name to all filters in any filter
+	   graph.  This can be used to set the device to upload to with the
+	   "hwupload" filter, or the device to map to with the "hwmap" filter.
+	   Other filters may also make use of this parameter when they require
+	   a hardware device.  Note that this is typically only required when
+	   the input is not already in hardware frames - when it is, filters
+	   will derive the device they require from the context of the frames
+	   they receive as input.
+
+	   This is a global setting, so all filters will receive the same
+	   device.
+
+       -hwaccel[:stream_specifier] hwaccel (input,per-stream)
+	   Use hardware acceleration to decode the matching stream(s). The
+	   allowed values of hwaccel are:
+
+	   none
+	       Do not use any hardware acceleration (the default).
+
+	   auto
+	       Automatically select the hardware acceleration method.
+
+	   vdpau
+	       Use VDPAU (Video Decode and Presentation API for Unix) hardware
+	       acceleration.
+
+	   dxva2
+	       Use DXVA2 (DirectX Video Acceleration) hardware acceleration.
+
+	   d3d11va
+	       Use D3D11VA (DirectX Video Acceleration) hardware acceleration.
+
+	   vaapi
+	       Use VAAPI (Video Acceleration API) hardware acceleration.
+
+	   qsv Use the Intel QuickSync Video acceleration for video
+	       transcoding.
+
+	       Unlike most other values, this option does not enable
+	       accelerated decoding (that is used automatically whenever a qsv
+	       decoder is selected), but accelerated transcoding, without
+	       copying the frames into the system memory.
+
+	       For it to work, both the decoder and the encoder must support
+	       QSV acceleration and no filters must be used.
+
+	   This option has no effect if the selected hwaccel is not available
+	   or not supported by the chosen decoder.
+
+	   Note that most acceleration methods are intended for playback and
+	   will not be faster than software decoding on modern CPUs.
+	   Additionally, ffmpeg will usually need to copy the decoded frames
+	   from the GPU memory into the system memory, resulting in further
+	   performance loss. This option is thus mainly useful for testing.
+
+       -hwaccel_device[:stream_specifier] hwaccel_device (input,per-stream)
+	   Select a device to use for hardware acceleration.
+
+	   This option only makes sense when the -hwaccel option is also
+	   specified.  It can either refer to an existing device created with
+	   -init_hw_device by name, or it can create a new device as if
+	   -init_hw_device type:hwaccel_device were called immediately before.
+
+       -hwaccels
+	   List all hardware acceleration components enabled in this build of
+	   ffmpeg.  Actual runtime availability depends on the hardware and
+	   its suitable driver being installed.
+
+       -fix_sub_duration_heartbeat[:stream_specifier]
+	   Set a specific output video stream as the heartbeat stream
+	   according to which to split and push through currently in-progress
+	   subtitle upon receipt of a random access packet.
+
+	   This lowers the latency of subtitles for which the end packet or
+	   the following subtitle has not yet been received. As a drawback,
+	   this will most likely lead to duplication of subtitle events in
+	   order to cover the full duration, so when dealing with use cases
+	   where latency of when the subtitle event is passed on to output is
+	   not relevant this option should not be utilized.
+
+	   Requires -fix_sub_duration to be set for the relevant input
+	   subtitle stream for this to have any effect, as well as for the
+	   input subtitle stream having to be directly mapped to the same
+	   output in which the heartbeat stream resides.
+
+   Audio Options
+       -aframes number (output)
+	   Set the number of audio frames to output. This is an obsolete alias
+	   for "-frames:a", which you should use instead.
+
+       -ar[:stream_specifier] freq (input/output,per-stream)
+	   Set the audio sampling frequency. For output streams it is set by
+	   default to the frequency of the corresponding input stream. For
+	   input streams this option only makes sense for audio grabbing
+	   devices and raw demuxers and is mapped to the corresponding demuxer
+	   options.
+
+       -aq q (output)
+	   Set the audio quality (codec-specific, VBR). This is an alias for
+	   -q:a.
+
+       -ac[:stream_specifier] channels (input/output,per-stream)
+	   Set the number of audio channels. For output streams it is set by
+	   default to the number of input audio channels. For input streams
+	   this option only makes sense for audio grabbing devices and raw
+	   demuxers and is mapped to the corresponding demuxer options.
+
+       -an (input/output)
+	   As an input option, blocks all audio streams of a file from being
+	   filtered or being automatically selected or mapped for any output.
+	   See "-discard" option to disable streams individually.
+
+	   As an output option, disables audio recording i.e. automatic
+	   selection or mapping of any audio stream. For full manual control
+	   see the "-map" option.
+
+       -acodec codec (input/output)
+	   Set the audio codec. This is an alias for "-codec:a".
+
+       -sample_fmt[:stream_specifier] sample_fmt (output,per-stream)
+	   Set the audio sample format. Use "-sample_fmts" to get a list of
+	   supported sample formats.
+
+       -af filtergraph (output)
+	   Create the filtergraph specified by filtergraph and use it to
+	   filter the stream.
+
+	   This is an alias for "-filter:a", see the -filter option.
+
+   Advanced Audio options
+       -atag fourcc/tag (output)
+	   Force audio tag/fourcc. This is an alias for "-tag:a".
+
+       -guess_layout_max channels (input,per-stream)
+	   If some input channel layout is not known, try to guess only if it
+	   corresponds to at most the specified number of channels. For
+	   example, 2 tells to ffmpeg to recognize 1 channel as mono and 2
+	   channels as stereo but not 6 channels as 5.1. The default is to
+	   always try to guess. Use 0 to disable all guessing.
+
+   Subtitle options
+       -scodec codec (input/output)
+	   Set the subtitle codec. This is an alias for "-codec:s".
+
+       -sn (input/output)
+	   As an input option, blocks all subtitle streams of a file from
+	   being filtered or being automatically selected or mapped for any
+	   output. See "-discard" option to disable streams individually.
+
+	   As an output option, disables subtitle recording i.e. automatic
+	   selection or mapping of any subtitle stream. For full manual
+	   control see the "-map" option.
+
+   Advanced Subtitle options
+       -fix_sub_duration
+	   Fix subtitles durations. For each subtitle, wait for the next
+	   packet in the same stream and adjust the duration of the first to
+	   avoid overlap. This is necessary with some subtitles codecs,
+	   especially DVB subtitles, because the duration in the original
+	   packet is only a rough estimate and the end is actually marked by
+	   an empty subtitle frame. Failing to use this option when necessary
+	   can result in exaggerated durations or muxing failures due to non-
+	   monotonic timestamps.
+
+	   Note that this option will delay the output of all data until the
+	   next subtitle packet is decoded: it may increase memory consumption
+	   and latency a lot.
+
+       -canvas_size size
+	   Set the size of the canvas used to render subtitles.
+
+   Advanced options
+       -map [-]input_file_id[:stream_specifier][?] | [linklabel] (output)
+	   Create one or more streams in the output file. This option has two
+	   forms for specifying the data source(s): the first selects one or
+	   more streams from some input file (specified with "-i"), the second
+	   takes an output from some complex filtergraph (specified with
+	   "-filter_complex").
+
+	   In the first form, an output stream is created for every stream
+	   from the input file with the index input_file_id. If
+	   stream_specifier is given, only those streams that match the
+	   specifier are used (see the Stream specifiers section for the
+	   stream_specifier syntax).
+
+	   A "-" character before the stream identifier creates a "negative"
+	   mapping.  It disables matching streams from already created
+	   mappings.
+
+	   A trailing "?" after the stream index will allow the map to be
+	   optional: if the map matches no streams the map will be ignored
+	   instead of failing. Note the map will still fail if an invalid
+	   input file index is used; such as if the map refers to a non-
+	   existent input.
+
+	   An alternative [linklabel] form will map outputs from complex
+	   filter graphs (see the -filter_complex option) to the output file.
+	   linklabel must correspond to a defined output link label in the
+	   graph.
+
+	   This option may be specified multiple times, each adding more
+	   streams to the output file. Any given input stream may also be
+	   mapped any number of times as a source for different output
+	   streams, e.g. in order to use different encoding options and/or
+	   filters. The streams are created in the output in the same order in
+	   which the "-map" options are given on the commandline.
+
+	   Using this option disables the default mappings for this output
+	   file.
+
+	   Examples:
+
+	   map everything
+	       To map ALL streams from the first input file to output
+
+		       ffmpeg -i INPUT -map 0 output
+
+	   select specific stream
+	       If you have two audio streams in the first input file, these
+	       streams are identified by 0:0 and 0:1. You can use "-map" to
+	       select which streams to place in an output file. For example:
+
+		       ffmpeg -i INPUT -map 0:1 out.wav
+
+	       will map the second input stream in INPUT to the (single)
+	       output stream in out.wav.
+
+	   create multiple streams
+	       To select the stream with index 2 from input file a.mov
+	       (specified by the identifier 0:2), and stream with index 6 from
+	       input b.mov (specified by the identifier 1:6), and copy them to
+	       the output file out.mov:
+
+		       ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
+
+	   create multiple streams 2
+	       To select all video and the third audio stream from an input
+	       file:
+
+		       ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT
+
+	   negative map
+	       To map all the streams except the second audio, use negative
+	       mappings
+
+		       ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
+
+	   optional map
+	       To map the video and audio streams from the first input, and
+	       using the trailing "?", ignore the audio mapping if no audio
+	       streams exist in the first input:
+
+		       ffmpeg -i INPUT -map 0:v -map 0:a? OUTPUT
+
+	   map by language
+	       To pick the English audio stream:
+
+		       ffmpeg -i INPUT -map 0:m:language:eng OUTPUT
+
+       -ignore_unknown
+	   Ignore input streams with unknown type instead of failing if
+	   copying such streams is attempted.
+
+       -copy_unknown
+	   Allow input streams with unknown type to be copied instead of
+	   failing if copying such streams is attempted.
+
+       -map_metadata[:metadata_spec_out] infile[:metadata_spec_in]
+       (output,per-metadata)
+	   Set metadata information of the next output file from infile. Note
+	   that those are file indices (zero-based), not filenames.  Optional
+	   metadata_spec_in/out parameters specify, which metadata to copy.  A
+	   metadata specifier can have the following forms:
+
+	   g   global metadata, i.e. metadata that applies to the whole file
+
+	   s[:stream_spec]
+	       per-stream metadata. stream_spec is a stream specifier as
+	       described in the Stream specifiers chapter. In an input
+	       metadata specifier, the first matching stream is copied from.
+	       In an output metadata specifier, all matching streams are
+	       copied to.
+
+	   c:chapter_index
+	       per-chapter metadata. chapter_index is the zero-based chapter
+	       index.
+
+	   p:program_index
+	       per-program metadata. program_index is the zero-based program
+	       index.
+
+	   If metadata specifier is omitted, it defaults to global.
+
+	   By default, global metadata is copied from the first input file,
+	   per-stream and per-chapter metadata is copied along with
+	   streams/chapters. These default mappings are disabled by creating
+	   any mapping of the relevant type. A negative file index can be used
+	   to create a dummy mapping that just disables automatic copying.
+
+	   For example to copy metadata from the first stream of the input
+	   file to global metadata of the output file:
+
+		   ffmpeg -i in.ogg -map_metadata 0:s:0 out.mp3
+
+	   To do the reverse, i.e. copy global metadata to all audio streams:
+
+		   ffmpeg -i in.mkv -map_metadata:s:a 0:g out.mkv
+
+	   Note that simple 0 would work as well in this example, since global
+	   metadata is assumed by default.
+
+       -map_chapters input_file_index (output)
+	   Copy chapters from input file with index input_file_index to the
+	   next output file. If no chapter mapping is specified, then chapters
+	   are copied from the first input file with at least one chapter. Use
+	   a negative file index to disable any chapter copying.
+
+       -benchmark (global)
+	   Show benchmarking information at the end of an encode.  Shows real,
+	   system and user time used and maximum memory consumption.  Maximum
+	   memory consumption is not supported on all systems, it will usually
+	   display as 0 if not supported.
+
+       -benchmark_all (global)
+	   Show benchmarking information during the encode.  Shows real,
+	   system and user time used in various steps (audio/video
+	   encode/decode).
+
+       -timelimit duration (global)
+	   Exit after ffmpeg has been running for duration seconds in CPU user
+	   time.
+
+       -dump (global)
+	   Dump each input packet to stderr.
+
+       -hex (global)
+	   When dumping packets, also dump the payload.
+
+       -readrate speed (input)
+	   Limit input read speed.
+
+	   Its value is a floating-point positive number which represents the
+	   maximum duration of media, in seconds, that should be ingested in
+	   one second of wallclock time.  Default value is zero and represents
+	   no imposed limitation on speed of ingestion.  Value 1 represents
+	   real-time speed and is equivalent to "-re".
+
+	   Mainly used to simulate a capture device or live input stream (e.g.
+	   when reading from a file).  Should not be used with a low value
+	   when input is an actual capture device or live stream as it may
+	   cause packet loss.
+
+	   It is useful for when flow speed of output packets is important,
+	   such as live streaming.
+
+       -re (input)
+	   Read input at native frame rate. This is equivalent to setting
+	   "-readrate 1".
+
+       -readrate_initial_burst seconds
+	   Set an initial read burst time, in seconds, after which
+	   -re/-readrate will be enforced.
+
+       -vsync parameter (global)
+       -fps_mode[:stream_specifier] parameter (output,per-stream)
+	   Set video sync method / framerate mode. vsync is applied to all
+	   output video streams but can be overridden for a stream by setting
+	   fps_mode. vsync is deprecated and will be removed in the future.
+
+	   For compatibility reasons some of the values for vsync can be
+	   specified as numbers (shown in parentheses in the following table).
+
+	   passthrough (0)
+	       Each frame is passed with its timestamp from the demuxer to the
+	       muxer.
+
+	   cfr (1)
+	       Frames will be duplicated and dropped to achieve exactly the
+	       requested constant frame rate.
+
+	   vfr (2)
+	       Frames are passed through with their timestamp or dropped so as
+	       to prevent 2 frames from having the same timestamp.
+
+	   auto (-1)
+	       Chooses between cfr and vfr depending on muxer capabilities.
+	       This is the default method.
+
+	   Note that the timestamps may be further modified by the muxer,
+	   after this.	For example, in the case that the format option
+	   avoid_negative_ts is enabled.
+
+	   With -map you can select from which stream the timestamps should be
+	   taken. You can leave either video or audio unchanged and sync the
+	   remaining stream(s) to the unchanged one.
+
+       -frame_drop_threshold parameter
+	   Frame drop threshold, which specifies how much behind video frames
+	   can be before they are dropped. In frame rate units, so 1.0 is one
+	   frame.  The default is -1.1. One possible usecase is to avoid
+	   framedrops in case of noisy timestamps or to increase frame drop
+	   precision in case of exact timestamps.
+
+       -apad parameters (output,per-stream)
+	   Pad the output audio stream(s). This is the same as applying "-af
+	   apad".  Argument is a string of filter parameters composed the same
+	   as with the "apad" filter.  "-shortest" must be set for this output
+	   for the option to take effect.
+
+       -copyts
+	   Do not process input timestamps, but keep their values without
+	   trying to sanitize them. In particular, do not remove the initial
+	   start time offset value.
+
+	   Note that, depending on the vsync option or on specific muxer
+	   processing (e.g. in case the format option avoid_negative_ts is
+	   enabled) the output timestamps may mismatch with the input
+	   timestamps even when this option is selected.
+
+       -start_at_zero
+	   When used with copyts, shift input timestamps so they start at
+	   zero.
+
+	   This means that using e.g. "-ss 50" will make output timestamps
+	   start at 50 seconds, regardless of what timestamp the input file
+	   started at.
+
+       -copytb mode
+	   Specify how to set the encoder timebase when stream copying.  mode
+	   is an integer numeric value, and can assume one of the following
+	   values:
+
+	   1   Use the demuxer timebase.
+
+	       The time base is copied to the output encoder from the
+	       corresponding input demuxer. This is sometimes required to
+	       avoid non monotonically increasing timestamps when copying
+	       video streams with variable frame rate.
+
+	   0   Use the decoder timebase.
+
+	       The time base is copied to the output encoder from the
+	       corresponding input decoder.
+
+	   -1  Try to make the choice automatically, in order to generate a
+	       sane output.
+
+	   Default value is -1.
+
+       -enc_time_base[:stream_specifier] timebase (output,per-stream)
+	   Set the encoder timebase. timebase can assume one of the following
+	   values:
+
+	   0   Assign a default value according to the media type.
+
+	       For video - use 1/framerate, for audio - use 1/samplerate.
+
+	   demux
+	       Use the timebase from the demuxer.
+
+	   filter
+	       Use the timebase from the filtergraph.
+
+	   a positive number
+	       Use the provided number as the timebase.
+
+	       This field can be provided as a ratio of two integers (e.g.
+	       1:24, 1:48000) or as a decimal number (e.g. 0.04166, 2.0833e-5)
+
+	   Default value is 0.
+
+       -bitexact (input/output)
+	   Enable bitexact mode for (de)muxer and (de/en)coder
+
+       -shortest (output)
+	   Finish encoding when the shortest output stream ends.
+
+	   Note that this option may require buffering frames, which
+	   introduces extra latency. The maximum amount of this latency may be
+	   controlled with the "-shortest_buf_duration" option.
+
+       -shortest_buf_duration duration (output)
+	   The "-shortest" option may require buffering potentially large
+	   amounts of data when at least one of the streams is "sparse" (i.e.
+	   has large gaps between frames X this is typically the case for
+	   subtitles).
+
+	   This option controls the maximum duration of buffered frames in
+	   seconds.  Larger values may allow the "-shortest" option to produce
+	   more accurate results, but increase memory use and latency.
+
+	   The default value is 10 seconds.
+
+       -dts_delta_threshold threshold
+	   Timestamp discontinuity delta threshold, expressed as a decimal
+	   number of seconds.
+
+	   The timestamp discontinuity correction enabled by this option is
+	   only applied to input formats accepting timestamp discontinuity
+	   (for which the "AVFMT_TS_DISCONT" flag is enabled), e.g. MPEG-TS
+	   and HLS, and is automatically disabled when employing the "-copyts"
+	   option (unless wrapping is detected).
+
+	   If a timestamp discontinuity is detected whose absolute value is
+	   greater than threshold, ffmpeg will remove the discontinuity by
+	   decreasing/increasing the current DTS and PTS by the corresponding
+	   delta value.
+
+	   The default value is 10.
+
+       -dts_error_threshold threshold
+	   Timestamp error delta threshold, expressed as a decimal number of
+	   seconds.
+
+	   The timestamp correction enabled by this option is only applied to
+	   input formats not accepting timestamp discontinuity (for which the
+	   "AVFMT_TS_DISCONT" flag is not enabled).
+
+	   If a timestamp discontinuity is detected whose absolute value is
+	   greater than threshold, ffmpeg will drop the PTS/DTS timestamp
+	   value.
+
+	   The default value is "3600*30" (30 hours), which is arbitrarily
+	   picked and quite conservative.
+
+       -muxdelay seconds (output)
+	   Set the maximum demux-decode delay.
+
+       -muxpreload seconds (output)
+	   Set the initial demux-decode delay.
+
+       -streamid output-stream-index:new-value (output)
+	   Assign a new stream-id value to an output stream. This option
+	   should be specified prior to the output filename to which it
+	   applies.  For the situation where multiple output files exist, a
+	   streamid may be reassigned to a different value.
+
+	   For example, to set the stream 0 PID to 33 and the stream 1 PID to
+	   36 for an output mpegts file:
+
+		   ffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts
+
+       -bsf[:stream_specifier] bitstream_filters (input/output,per-stream)
+	   Apply bitstream filters to matching streams. The filters are
+	   applied to each packet as it is received from the demuxer (when
+	   used as an input option) or before it is sent to the muxer (when
+	   used as an output option).
+
+	   bitstream_filters is a comma-separated list of bitstream filter
+	   specifications, each of the form
+
+		   <filter>[=<optname0>=<optval0>:<optname1>=<optval1>:...]
+
+	   Any of the ',=:' characters that are to be a part of an option
+	   value need to be escaped with a backslash.
+
+	   Use the "-bsfs" option to get the list of bitstream filters.
+
+	   E.g.
+
+		   ffmpeg -bsf:v h264_mp4toannexb -i h264.mp4 -c:v copy -an out.h264
+
+	   applies the "h264_mp4toannexb" bitstream filter (which converts
+	   MP4-encapsulated H.264 stream to Annex B) to the input video
+	   stream.
+
+	   On the other hand,
+
+		   ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt
+
+	   applies the "mov2textsub" bitstream filter (which extracts text
+	   from MOV subtitles) to the output subtitle stream. Note, however,
+	   that since both examples use "-c copy", it matters little whether
+	   the filters are applied on input or output - that would change if
+	   transcoding was happening.
+
+       -tag[:stream_specifier] codec_tag (input/output,per-stream)
+	   Force a tag/fourcc for matching streams.
+
+       -timecode hh:mm:ssSEPff
+	   Specify Timecode for writing. SEP is ':' for non drop timecode and
+	   ';' (or '.') for drop.
+
+		   ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg
+
+       -filter_complex filtergraph (global)
+	   Define a complex filtergraph, i.e. one with arbitrary number of
+	   inputs and/or outputs. For simple graphs -- those with one input
+	   and one output of the same type -- see the -filter options.
+	   filtergraph is a description of the filtergraph, as described in
+	   the ``Filtergraph syntax'' section of the ffmpeg-filters manual.
+
+	   Input link labels must refer to either input streams or loopback
+	   decoders. For input streams, use the
+	   "[file_index:stream_specifier]" syntax (i.e. the same as -map
+	   uses). If stream_specifier matches multiple streams, the first one
+	   will be used.
+
+	   For decoders, the link label must be [dec:dec_idx], where dec_idx
+	   is the index of the loopback decoder to be connected to given
+	   input.
+
+	   An unlabeled input will be connected to the first unused input
+	   stream of the matching type.
+
+	   Output link labels are referred to with -map. Unlabeled outputs are
+	   added to the first output file.
+
+	   Note that with this option it is possible to use only lavfi sources
+	   without normal input files.
+
+	   For example, to overlay an image over video
+
+		   ffmpeg -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map
+		   '[out]' out.mkv
+
+	   Here "[0:v]" refers to the first video stream in the first input
+	   file, which is linked to the first (main) input of the overlay
+	   filter. Similarly the first video stream in the second input is
+	   linked to the second (overlay) input of overlay.
+
+	   Assuming there is only one video stream in each input file, we can
+	   omit input labels, so the above is equivalent to
+
+		   ffmpeg -i video.mkv -i image.png -filter_complex 'overlay[out]' -map
+		   '[out]' out.mkv
+
+	   Furthermore we can omit the output label and the single output from
+	   the filter graph will be added to the output file automatically, so
+	   we can simply write
+
+		   ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' out.mkv
+
+	   As a special exception, you can use a bitmap subtitle stream as
+	   input: it will be converted into a video with the same size as the
+	   largest video in the file, or 720x576 if no video is present. Note
+	   that this is an experimental and temporary solution. It will be
+	   removed once libavfilter has proper support for subtitles.
+
+	   For example, to hardcode subtitles on top of a DVB-T recording
+	   stored in MPEG-TS format, delaying the subtitles by 1 second:
+
+		   ffmpeg -i input.ts -filter_complex \
+		     '[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \
+		     -sn -map '#0x2dc' output.mkv
+
+	   (0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the
+	   video, audio and subtitles streams; 0:0, 0:3 and 0:7 would have
+	   worked too)
+
+	   To generate 5 seconds of pure red video using lavfi "color" source:
+
+		   ffmpeg -filter_complex 'color=c=red' -t 5 out.mkv
+
+       -filter_complex_threads nb_threads (global)
+	   Defines how many threads are used to process a filter_complex
+	   graph.  Similar to filter_threads but used for "-filter_complex"
+	   graphs only.  The default is the number of available CPUs.
+
+       -lavfi filtergraph (global)
+	   Define a complex filtergraph, i.e. one with arbitrary number of
+	   inputs and/or outputs. Equivalent to -filter_complex.
+
+       -accurate_seek (input)
+	   This option enables or disables accurate seeking in input files
+	   with the -ss option. It is enabled by default, so seeking is
+	   accurate when transcoding. Use -noaccurate_seek to disable it,
+	   which may be useful e.g. when copying some streams and transcoding
+	   the others.
+
+       -seek_timestamp (input)
+	   This option enables or disables seeking by timestamp in input files
+	   with the -ss option. It is disabled by default. If enabled, the
+	   argument to the -ss option is considered an actual timestamp, and
+	   is not offset by the start time of the file. This matters only for
+	   files which do not start from timestamp 0, such as transport
+	   streams.
+
+       -thread_queue_size size (input/output)
+	   For input, this option sets the maximum number of queued packets
+	   when reading from the file or device. With low latency / high rate
+	   live streams, packets may be discarded if they are not read in a
+	   timely manner; setting this value can force ffmpeg to use a
+	   separate input thread and read packets as soon as they arrive. By
+	   default ffmpeg only does this if multiple inputs are specified.
+
+	   For output, this option specified the maximum number of packets
+	   that may be queued to each muxing thread.
+
+       -sdp_file file (global)
+	   Print sdp information for an output stream to file.	This allows
+	   dumping sdp information when at least one output isn't an rtp
+	   stream. (Requires at least one of the output formats to be rtp).
+
+       -discard (input)
+	   Allows discarding specific streams or frames from streams.  Any
+	   input stream can be fully discarded, using value "all" whereas
+	   selective discarding of frames from a stream occurs at the demuxer
+	   and is not supported by all demuxers.
+
+	   none
+	       Discard no frame.
+
+	   default
+	       Default, which discards no frames.
+
+	   noref
+	       Discard all non-reference frames.
+
+	   bidir
+	       Discard all bidirectional frames.
+
+	   nokey
+	       Discard all frames excepts keyframes.
+
+	   all Discard all frames.
+
+       -abort_on flags (global)
+	   Stop and abort on various conditions. The following flags are
+	   available:
+
+	   empty_output
+	       No packets were passed to the muxer, the output is empty.
+
+	   empty_output_stream
+	       No packets were passed to the muxer in some of the output
+	       streams.
+
+       -max_error_rate (global)
+	   Set fraction of decoding frame failures across all inputs which
+	   when crossed ffmpeg will return exit code 69. Crossing this
+	   threshold does not terminate processing. Range is a floating-point
+	   number between 0 to 1. Default is 2/3.
+
+       -xerror (global)
+	   Stop and exit on error
+
+       -max_muxing_queue_size packets (output,per-stream)
+	   When transcoding audio and/or video streams, ffmpeg will not begin
+	   writing into the output until it has one packet for each such
+	   stream. While waiting for that to happen, packets for other streams
+	   are buffered. This option sets the size of this buffer, in packets,
+	   for the matching output stream.
+
+	   The default value of this option should be high enough for most
+	   uses, so only touch this option if you are sure that you need it.
+
+       -muxing_queue_data_threshold bytes (output,per-stream)
+	   This is a minimum threshold until which the muxing queue size is
+	   not taken into account. Defaults to 50 megabytes per stream, and is
+	   based on the overall size of packets passed to the muxer.
+
+       -auto_conversion_filters (global)
+	   Enable automatically inserting format conversion filters in all
+	   filter graphs, including those defined by -vf, -af, -filter_complex
+	   and -lavfi. If filter format negotiation requires a conversion, the
+	   initialization of the filters will fail.  Conversions can still be
+	   performed by inserting the relevant conversion filter (scale,
+	   aresample) in the graph.  On by default, to explicitly disable it
+	   you need to specify "-noauto_conversion_filters".
+
+       -bits_per_raw_sample[:stream_specifier] value (output,per-stream)
+	   Declare the number of bits per raw sample in the given output
+	   stream to be value. Note that this option sets the information
+	   provided to the encoder/muxer, it does not change the stream to
+	   conform to this value. Setting values that do not match the stream
+	   properties may result in encoding failures or invalid output files.
+
+       -stats_enc_pre[:stream_specifier] path (output,per-stream)
+       -stats_enc_post[:stream_specifier] path (output,per-stream)
+       -stats_mux_pre[:stream_specifier] path (output,per-stream)
+	   Write per-frame encoding information about the matching streams
+	   into the file given by path.
+
+	   -stats_enc_pre writes information about raw video or audio frames
+	   right before they are sent for encoding, while -stats_enc_post
+	   writes information about encoded packets as they are received from
+	   the encoder.  -stats_mux_pre writes information about packets just
+	   as they are about to be sent to the muxer. Every frame or packet
+	   produces one line in the specified file. The format of this line is
+	   controlled by -stats_enc_pre_fmt / -stats_enc_post_fmt /
+	   -stats_mux_pre_fmt.
+
+	   When stats for multiple streams are written into a single file, the
+	   lines corresponding to different streams will be interleaved. The
+	   precise order of this interleaving is not specified and not
+	   guaranteed to remain stable between different invocations of the
+	   program, even with the same options.
+
+       -stats_enc_pre_fmt[:stream_specifier] format_spec (output,per-stream)
+       -stats_enc_post_fmt[:stream_specifier] format_spec (output,per-stream)
+       -stats_mux_pre_fmt[:stream_specifier] format_spec (output,per-stream)
+	   Specify the format for the lines written with -stats_enc_pre /
+	   -stats_enc_post / -stats_mux_pre.
+
+	   format_spec is a string that may contain directives of the form
+	   {fmt}. format_spec is backslash-escaped --- use \{, \}, and \\ to
+	   write a literal {, }, or \, respectively, into the output.
+
+	   The directives given with fmt may be one of the following:
+
+	   fidx
+	       Index of the output file.
+
+	   sidx
+	       Index of the output stream in the file.
+
+	   n   Frame number. Pre-encoding: number of frames sent to the
+	       encoder so far.	Post-encoding: number of packets received from
+	       the encoder so far.  Muxing: number of packets submitted to the
+	       muxer for this stream so far.
+
+	   ni  Input frame number. Index of the input frame (i.e. output by a
+	       decoder) that corresponds to this output frame or packet. -1 if
+	       unavailable.
+
+	   tb  Timebase in which this frame/packet's timestamps are expressed,
+	       as a rational number num/den. Note that encoder and muxer may
+	       use different timebases.
+
+	   tbi Timebase for ptsi, as a rational number num/den. Available when
+	       ptsi is available, 0/1 otherwise.
+
+	   pts Presentation timestamp of the frame or packet, as an integer.
+	       Should be multiplied by the timebase to compute presentation
+	       time.
+
+	   ptsi
+	       Presentation timestamp of the input frame (see ni), as an
+	       integer. Should be multiplied by tbi to compute presentation
+	       time. Printed as (2^63 - 1 = 9223372036854775807) when not
+	       available.
+
+	   t   Presentation time of the frame or packet, as a decimal number.
+	       Equal to pts multiplied by tb.
+
+	   ti  Presentation time of the input frame (see ni), as a decimal
+	       number. Equal to ptsi multiplied by tbi. Printed as inf when
+	       not available.
+
+	   dts (packet)
+	       Decoding timestamp of the packet, as an integer. Should be
+	       multiplied by the timebase to compute presentation time.
+
+	   dt (packet)
+	       Decoding time of the frame or packet, as a decimal number.
+	       Equal to dts multiplied by tb.
+
+	   sn (frame,audio)
+	       Number of audio samples sent to the encoder so far.
+
+	   samp (frame,audio)
+	       Number of audio samples in the frame.
+
+	   size (packet)
+	       Size of the encoded packet in bytes.
+
+	   br (packet)
+	       Current bitrate in bits per second.
+
+	   abr (packet)
+	       Average bitrate for the whole stream so far, in bits per
+	       second, -1 if it cannot be determined at this point.
+
+	   key (packet)
+	       Character 'K' if the packet contains a keyframe, character 'N'
+	       otherwise.
+
+	   Directives tagged with packet may only be used with
+	   -stats_enc_post_fmt and -stats_mux_pre_fmt.
+
+	   Directives tagged with frame may only be used with
+	   -stats_enc_pre_fmt.
+
+	   Directives tagged with audio may only be used with audio streams.
+
+	   The default format strings are:
+
+	   pre-encoding
+	       {fidx} {sidx} {n} {t}
+
+	   post-encoding
+	       {fidx} {sidx} {n} {t}
+
+	   In the future, new items may be added to the end of the default
+	   formatting strings. Users who depend on the format staying exactly
+	   the same, should prescribe it manually.
+
+	   Note that stats for different streams written into the same file
+	   may have different formats.
+
+   Preset files
+       A preset file contains a sequence of option=value pairs, one for each
+       line, specifying a sequence of options which would be awkward to
+       specify on the command line. Lines starting with the hash ('#')
+       character are ignored and are used to provide comments. Check the
+       presets directory in the FFmpeg source tree for examples.
+
+       There are two types of preset files: ffpreset and avpreset files.
+
+       ffpreset files
+
+       ffpreset files are specified with the "vpre", "apre", "spre", and
+       "fpre" options. The "fpre" option takes the filename of the preset
+       instead of a preset name as input and can be used for any kind of
+       codec. For the "vpre", "apre", and "spre" options, the options
+       specified in a preset file are applied to the currently selected codec
+       of the same type as the preset option.
+
+       The argument passed to the "vpre", "apre", and "spre" preset options
+       identifies the preset file to use according to the following rules:
+
+       First ffmpeg searches for a file named arg.ffpreset in the directories
+       $FFMPEG_DATADIR (if set), and $HOME/.ffmpeg, and in the datadir defined
+       at configuration time (usually PREFIX/share/ffmpeg) or in a ffpresets
+       folder along the executable on win32, in that order. For example, if
+       the argument is "libvpx-1080p", it will search for the file
+       libvpx-1080p.ffpreset.
+
+       If no such file is found, then ffmpeg will search for a file named
+       codec_name-arg.ffpreset in the above-mentioned directories, where
+       codec_name is the name of the codec to which the preset file options
+       will be applied. For example, if you select the video codec with
+       "-vcodec libvpx" and use "-vpre 1080p", then it will search for the
+       file libvpx-1080p.ffpreset.
+
+       avpreset files
+
+       avpreset files are specified with the "pre" option. They work similar
+       to ffpreset files, but they only allow encoder- specific options.
+       Therefore, an option=value pair specifying an encoder cannot be used.
+
+       When the "pre" option is specified, ffmpeg will look for files with the
+       suffix .avpreset in the directories $AVCONV_DATADIR (if set), and
+       $HOME/.avconv, and in the datadir defined at configuration time
+       (usually PREFIX/share/ffmpeg), in that order.
+
+       First ffmpeg searches for a file named codec_name-arg.avpreset in the
+       above-mentioned directories, where codec_name is the name of the codec
+       to which the preset file options will be applied. For example, if you
+       select the video codec with "-vcodec libvpx" and use "-pre 1080p", then
+       it will search for the file libvpx-1080p.avpreset.
+
+       If no such file is found, then ffmpeg will search for a file named
+       arg.avpreset in the same directories.
+
+   vstats file format
+       The "-vstats" and "-vstats_file" options enable generation of a file
+       containing statistics about the generated video outputs.
+
+       The "-vstats_version" option controls the format version of the
+       generated file.
+
+       With version 1 the format is:
+
+	       frame= <FRAME> q= <FRAME_QUALITY> PSNR= <PSNR> f_size= <FRAME_SIZE> s_size= <STREAM_SIZE>kB time= <TIMESTAMP> br= <BITRATE>kbits/s avg_br= <AVERAGE_BITRATE>kbits/s
+
+       With version 2 the format is:
+
+	       out= <OUT_FILE_INDEX> st= <OUT_FILE_STREAM_INDEX> frame= <FRAME_NUMBER> q= <FRAME_QUALITY>f PSNR= <PSNR> f_size= <FRAME_SIZE> s_size= <STREAM_SIZE>kB time= <TIMESTAMP> br= <BITRATE>kbits/s avg_br= <AVERAGE_BITRATE>kbits/s
+
+       The value corresponding to each key is described below:
+
+       avg_br
+	   average bitrate expressed in Kbits/s
+
+       br  bitrate expressed in Kbits/s
+
+       frame
+	   number of encoded frame
+
+       out out file index
+
+       PSNR
+	   Peak Signal to Noise Ratio
+
+       q   quality of the frame
+
+       f_size
+	   encoded packet size expressed as number of bytes
+
+       s_size
+	   stream size expressed in KiB
+
+       st  out file stream index
+
+       time
+	   time of the packet
+
+       type
+	   picture type
+
+       See also the -stats_enc options for an alternative way to show encoding
+       statistics.
+
+EXAMPLES
+   Video and Audio grabbing
+       If you specify the input format and device then ffmpeg can grab video
+       and audio directly.
+
+	       ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
+
+       Or with an ALSA audio source (mono input, card id 1) instead of OSS:
+
+	       ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg
+
+       Note that you must activate the right video source and channel before
+       launching ffmpeg with any TV viewer such as
+       <http://linux.bytesex.org/xawtv/> by Gerd Knorr. You also have to set
+       the audio recording levels correctly with a standard mixer.
+
+   X11 grabbing
+       Grab the X11 display with ffmpeg via
+
+	       ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg
+
+       0.0 is display.screen number of your X11 server, same as the DISPLAY
+       environment variable.
+
+	       ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg
+
+       0.0 is display.screen number of your X11 server, same as the DISPLAY
+       environment variable. 10 is the x-offset and 20 the y-offset for the
+       grabbing.
+
+   Video and Audio file format conversion
+       Any supported file format and protocol can serve as input to ffmpeg:
+
+       Examples:
+
+       o   You can use YUV files as input:
+
+		   ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
+
+	   It will use the files:
+
+		   /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
+		   /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
+
+	   The Y files use twice the resolution of the U and V files. They are
+	   raw files, without header. They can be generated by all decent
+	   video decoders. You must specify the size of the image with the -s
+	   option if ffmpeg cannot guess it.
+
+       o   You can input from a raw YUV420P file:
+
+		   ffmpeg -i /tmp/test.yuv /tmp/out.avi
+
+	   test.yuv is a file containing raw YUV planar data. Each frame is
+	   composed of the Y plane followed by the U and V planes at half
+	   vertical and horizontal resolution.
+
+       o   You can output to a raw YUV420P file:
+
+		   ffmpeg -i mydivx.avi hugefile.yuv
+
+       o   You can set several input files and output files:
+
+		   ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
+
+	   Converts the audio file a.wav and the raw YUV video file a.yuv to
+	   MPEG file a.mpg.
+
+       o   You can also do audio and video conversions at the same time:
+
+		   ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
+
+	   Converts a.wav to MPEG audio at 22050 Hz sample rate.
+
+       o   You can encode to several formats at the same time and define a
+	   mapping from input stream to output streams:
+
+		   ffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2
+
+	   Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits.
+	   '-map file:index' specifies which input stream is used for each
+	   output stream, in the order of the definition of output streams.
+
+       o   You can transcode decrypted VOBs:
+
+		   ffmpeg -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi
+
+	   This is a typical DVD ripping example; the input is a VOB file, the
+	   output an AVI file with MPEG-4 video and MP3 audio. Note that in
+	   this command we use B-frames so the MPEG-4 stream is DivX5
+	   compatible, and GOP size is 300 which means one intra frame every
+	   10 seconds for 29.97fps input video. Furthermore, the audio stream
+	   is MP3-encoded so you need to enable LAME support by passing
+	   "--enable-libmp3lame" to configure.	The mapping is particularly
+	   useful for DVD transcoding to get the desired audio language.
+
+	   NOTE: To see the supported input formats, use "ffmpeg -demuxers".
+
+       o   You can extract images from a video, or create a video from many
+	   images:
+
+	   For extracting images from a video:
+
+		   ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
+
+	   This will extract one video frame per second from the video and
+	   will output them in files named foo-001.jpeg, foo-002.jpeg, etc.
+	   Images will be rescaled to fit the new WxH values.
+
+	   If you want to extract just a limited number of frames, you can use
+	   the above command in combination with the "-frames:v" or "-t"
+	   option, or in combination with -ss to start extracting from a
+	   certain point in time.
+
+	   For creating a video from many images:
+
+		   ffmpeg -f image2 -framerate 12 -i foo-%03d.jpeg -s WxH foo.avi
+
+	   The syntax "foo-%03d.jpeg" specifies to use a decimal number
+	   composed of three digits padded with zeroes to express the sequence
+	   number. It is the same syntax supported by the C printf function,
+	   but only formats accepting a normal integer are suitable.
+
+	   When importing an image sequence, -i also supports expanding shell-
+	   like wildcard patterns (globbing) internally, by selecting the
+	   image2-specific "-pattern_type glob" option.
+
+	   For example, for creating a video from filenames matching the glob
+	   pattern "foo-*.jpeg":
+
+		   ffmpeg -f image2 -pattern_type glob -framerate 12 -i 'foo-*.jpeg' -s WxH foo.avi
+
+       o   You can put many streams of the same type in the output:
+
+		   ffmpeg -i test1.avi -i test2.avi -map 1:1 -map 1:0 -map 0:1 -map 0:0 -c copy -y test12.nut
+
+	   The resulting output file test12.nut will contain the first four
+	   streams from the input files in reverse order.
+
+       o   To force CBR video output:
+
+		   ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
+
+       o   The four options lmin, lmax, mblmin and mblmax use 'lambda' units,
+	   but you may use the QP2LAMBDA constant to easily convert from 'q'
+	   units:
+
+		   ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
+
+SYNTAX
+       This section documents the syntax and formats employed by the FFmpeg
+       libraries and tools.
+
+   Quoting and escaping
+       FFmpeg adopts the following quoting and escaping mechanism, unless
+       explicitly specified. The following rules are applied:
+
+       o   ' and \ are special characters (respectively used for quoting and
+	   escaping). In addition to them, there might be other special
+	   characters depending on the specific syntax where the escaping and
+	   quoting are employed.
+
+       o   A special character is escaped by prefixing it with a \.
+
+       o   All characters enclosed between '' are included literally in the
+	   parsed string. The quote character ' itself cannot be quoted, so
+	   you may need to close the quote and escape it.
+
+       o   Leading and trailing whitespaces, unless escaped or quoted, are
+	   removed from the parsed string.
+
+       Note that you may need to add a second level of escaping when using the
+       command line or a script, which depends on the syntax of the adopted
+       shell language.
+
+       The function "av_get_token" defined in libavutil/avstring.h can be used
+       to parse a token quoted or escaped according to the rules defined
+       above.
+
+       The tool tools/ffescape in the FFmpeg source tree can be used to
+       automatically quote or escape a string in a script.
+
+       Examples
+
+       o   Escape the string "Crime d'Amour" containing the "'" special
+	   character:
+
+		   Crime d\'Amour
+
+       o   The string above contains a quote, so the "'" needs to be escaped
+	   when quoting it:
+
+		   'Crime d'\''Amour'
+
+       o   Include leading or trailing whitespaces using quoting:
+
+		   '  this string starts and ends with whitespaces  '
+
+       o   Escaping and quoting can be mixed together:
+
+		   ' The string '\'string\'' is a string '
+
+       o   To include a literal \ you can use either escaping or quoting:
+
+		   'c:\foo' can be written as c:\\foo
+
+   Date
+       The accepted syntax is:
+
+	       [(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z]
+	       now
+
+       If the value is "now" it takes the current time.
+
+       Time is local time unless Z is appended, in which case it is
+       interpreted as UTC.  If the year-month-day part is not specified it
+       takes the current year-month-day.
+
+   Time duration
+       There are two accepted syntaxes for expressing time duration.
+
+	       [-][<HH>:]<MM>:<SS>[.<m>...]
+
+       HH expresses the number of hours, MM the number of minutes for a
+       maximum of 2 digits, and SS the number of seconds for a maximum of 2
+       digits. The m at the end expresses decimal value for SS.
+
+       or
+
+	       [-]<S>+[.<m>...][s|ms|us]
+
+       S expresses the number of seconds, with the optional decimal part m.
+       The optional literal suffixes s, ms or us indicate to interpret the
+       value as seconds, milliseconds or microseconds, respectively.
+
+       In both expressions, the optional - indicates negative duration.
+
+       Examples
+
+       The following examples are all valid time duration:
+
+       55  55 seconds
+
+       0.2 0.2 seconds
+
+       200ms
+	   200 milliseconds, that's 0.2s
+
+       200000us
+	   200000 microseconds, that's 0.2s
+
+       12:03:45
+	   12 hours, 03 minutes and 45 seconds
+
+       23.189
+	   23.189 seconds
+
+   Video size
+       Specify the size of the sourced video, it may be a string of the form
+       widthxheight, or the name of a size abbreviation.
+
+       The following abbreviations are recognized:
+
+       ntsc
+	   720x480
+
+       pal 720x576
+
+       qntsc
+	   352x240
+
+       qpal
+	   352x288
+
+       sntsc
+	   640x480
+
+       spal
+	   768x576
+
+       film
+	   352x240
+
+       ntsc-film
+	   352x240
+
+       sqcif
+	   128x96
+
+       qcif
+	   176x144
+
+       cif 352x288
+
+       4cif
+	   704x576
+
+       16cif
+	   1408x1152
+
+       qqvga
+	   160x120
+
+       qvga
+	   320x240
+
+       vga 640x480
+
+       svga
+	   800x600
+
+       xga 1024x768
+
+       uxga
+	   1600x1200
+
+       qxga
+	   2048x1536
+
+       sxga
+	   1280x1024
+
+       qsxga
+	   2560x2048
+
+       hsxga
+	   5120x4096
+
+       wvga
+	   852x480
+
+       wxga
+	   1366x768
+
+       wsxga
+	   1600x1024
+
+       wuxga
+	   1920x1200
+
+       woxga
+	   2560x1600
+
+       wqsxga
+	   3200x2048
+
+       wquxga
+	   3840x2400
+
+       whsxga
+	   6400x4096
+
+       whuxga
+	   7680x4800
+
+       cga 320x200
+
+       ega 640x350
+
+       hd480
+	   852x480
+
+       hd720
+	   1280x720
+
+       hd1080
+	   1920x1080
+
+       2k  2048x1080
+
+       2kflat
+	   1998x1080
+
+       2kscope
+	   2048x858
+
+       4k  4096x2160
+
+       4kflat
+	   3996x2160
+
+       4kscope
+	   4096x1716
+
+       nhd 640x360
+
+       hqvga
+	   240x160
+
+       wqvga
+	   400x240
+
+       fwqvga
+	   432x240
+
+       hvga
+	   480x320
+
+       qhd 960x540
+
+       2kdci
+	   2048x1080
+
+       4kdci
+	   4096x2160
+
+       uhd2160
+	   3840x2160
+
+       uhd4320
+	   7680x4320
+
+   Video rate
+       Specify the frame rate of a video, expressed as the number of frames
+       generated per second. It has to be a string in the format
+       frame_rate_num/frame_rate_den, an integer number, a float number or a
+       valid video frame rate abbreviation.
+
+       The following abbreviations are recognized:
+
+       ntsc
+	   30000/1001
+
+       pal 25/1
+
+       qntsc
+	   30000/1001
+
+       qpal
+	   25/1
+
+       sntsc
+	   30000/1001
+
+       spal
+	   25/1
+
+       film
+	   24/1
+
+       ntsc-film
+	   24000/1001
+
+   Ratio
+       A ratio can be expressed as an expression, or in the form
+       numerator:denominator.
+
+       Note that a ratio with infinite (1/0) or negative value is considered
+       valid, so you should check on the returned value if you want to exclude
+       those values.
+
+       The undefined value can be expressed using the "0:0" string.
+
+   Color
+       It can be the name of a color as defined below (case insensitive match)
+       or a "[0x|#]RRGGBB[AA]" sequence, possibly followed by @ and a string
+       representing the alpha component.
+
+       The alpha component may be a string composed by "0x" followed by an
+       hexadecimal number or a decimal number between 0.0 and 1.0, which
+       represents the opacity value (0x00 or 0.0 means completely transparent,
+       0xff or 1.0 completely opaque). If the alpha component is not specified
+       then 0xff is assumed.
+
+       The string random will result in a random color.
+
+       The following names of colors are recognized:
+
+       AliceBlue
+	   0xF0F8FF
+
+       AntiqueWhite
+	   0xFAEBD7
+
+       Aqua
+	   0x00FFFF
+
+       Aquamarine
+	   0x7FFFD4
+
+       Azure
+	   0xF0FFFF
+
+       Beige
+	   0xF5F5DC
+
+       Bisque
+	   0xFFE4C4
+
+       Black
+	   0x000000
+
+       BlanchedAlmond
+	   0xFFEBCD
+
+       Blue
+	   0x0000FF
+
+       BlueViolet
+	   0x8A2BE2
+
+       Brown
+	   0xA52A2A
+
+       BurlyWood
+	   0xDEB887
+
+       CadetBlue
+	   0x5F9EA0
+
+       Chartreuse
+	   0x7FFF00
+
+       Chocolate
+	   0xD2691E
+
+       Coral
+	   0xFF7F50
+
+       CornflowerBlue
+	   0x6495ED
+
+       Cornsilk
+	   0xFFF8DC
+
+       Crimson
+	   0xDC143C
+
+       Cyan
+	   0x00FFFF
+
+       DarkBlue
+	   0x00008B
+
+       DarkCyan
+	   0x008B8B
+
+       DarkGoldenRod
+	   0xB8860B
+
+       DarkGray
+	   0xA9A9A9
+
+       DarkGreen
+	   0x006400
+
+       DarkKhaki
+	   0xBDB76B
+
+       DarkMagenta
+	   0x8B008B
+
+       DarkOliveGreen
+	   0x556B2F
+
+       Darkorange
+	   0xFF8C00
+
+       DarkOrchid
+	   0x9932CC
+
+       DarkRed
+	   0x8B0000
+
+       DarkSalmon
+	   0xE9967A
+
+       DarkSeaGreen
+	   0x8FBC8F
+
+       DarkSlateBlue
+	   0x483D8B
+
+       DarkSlateGray
+	   0x2F4F4F
+
+       DarkTurquoise
+	   0x00CED1
+
+       DarkViolet
+	   0x9400D3
+
+       DeepPink
+	   0xFF1493
+
+       DeepSkyBlue
+	   0x00BFFF
+
+       DimGray
+	   0x696969
+
+       DodgerBlue
+	   0x1E90FF
+
+       FireBrick
+	   0xB22222
+
+       FloralWhite
+	   0xFFFAF0
+
+       ForestGreen
+	   0x228B22
+
+       Fuchsia
+	   0xFF00FF
+
+       Gainsboro
+	   0xDCDCDC
+
+       GhostWhite
+	   0xF8F8FF
+
+       Gold
+	   0xFFD700
+
+       GoldenRod
+	   0xDAA520
+
+       Gray
+	   0x808080
+
+       Green
+	   0x008000
+
+       GreenYellow
+	   0xADFF2F
+
+       HoneyDew
+	   0xF0FFF0
+
+       HotPink
+	   0xFF69B4
+
+       IndianRed
+	   0xCD5C5C
+
+       Indigo
+	   0x4B0082
+
+       Ivory
+	   0xFFFFF0
+
+       Khaki
+	   0xF0E68C
+
+       Lavender
+	   0xE6E6FA
+
+       LavenderBlush
+	   0xFFF0F5
+
+       LawnGreen
+	   0x7CFC00
+
+       LemonChiffon
+	   0xFFFACD
+
+       LightBlue
+	   0xADD8E6
+
+       LightCoral
+	   0xF08080
+
+       LightCyan
+	   0xE0FFFF
+
+       LightGoldenRodYellow
+	   0xFAFAD2
+
+       LightGreen
+	   0x90EE90
+
+       LightGrey
+	   0xD3D3D3
+
+       LightPink
+	   0xFFB6C1
+
+       LightSalmon
+	   0xFFA07A
+
+       LightSeaGreen
+	   0x20B2AA
+
+       LightSkyBlue
+	   0x87CEFA
+
+       LightSlateGray
+	   0x778899
+
+       LightSteelBlue
+	   0xB0C4DE
+
+       LightYellow
+	   0xFFFFE0
+
+       Lime
+	   0x00FF00
+
+       LimeGreen
+	   0x32CD32
+
+       Linen
+	   0xFAF0E6
+
+       Magenta
+	   0xFF00FF
+
+       Maroon
+	   0x800000
+
+       MediumAquaMarine
+	   0x66CDAA
+
+       MediumBlue
+	   0x0000CD
+
+       MediumOrchid
+	   0xBA55D3
+
+       MediumPurple
+	   0x9370D8
+
+       MediumSeaGreen
+	   0x3CB371
+
+       MediumSlateBlue
+	   0x7B68EE
+
+       MediumSpringGreen
+	   0x00FA9A
+
+       MediumTurquoise
+	   0x48D1CC
+
+       MediumVioletRed
+	   0xC71585
+
+       MidnightBlue
+	   0x191970
+
+       MintCream
+	   0xF5FFFA
+
+       MistyRose
+	   0xFFE4E1
+
+       Moccasin
+	   0xFFE4B5
+
+       NavajoWhite
+	   0xFFDEAD
+
+       Navy
+	   0x000080
+
+       OldLace
+	   0xFDF5E6
+
+       Olive
+	   0x808000
+
+       OliveDrab
+	   0x6B8E23
+
+       Orange
+	   0xFFA500
+
+       OrangeRed
+	   0xFF4500
+
+       Orchid
+	   0xDA70D6
+
+       PaleGoldenRod
+	   0xEEE8AA
+
+       PaleGreen
+	   0x98FB98
+
+       PaleTurquoise
+	   0xAFEEEE
+
+       PaleVioletRed
+	   0xD87093
+
+       PapayaWhip
+	   0xFFEFD5
+
+       PeachPuff
+	   0xFFDAB9
+
+       Peru
+	   0xCD853F
+
+       Pink
+	   0xFFC0CB
+
+       Plum
+	   0xDDA0DD
+
+       PowderBlue
+	   0xB0E0E6
+
+       Purple
+	   0x800080
+
+       Red 0xFF0000
+
+       RosyBrown
+	   0xBC8F8F
+
+       RoyalBlue
+	   0x4169E1
+
+       SaddleBrown
+	   0x8B4513
+
+       Salmon
+	   0xFA8072
+
+       SandyBrown
+	   0xF4A460
+
+       SeaGreen
+	   0x2E8B57
+
+       SeaShell
+	   0xFFF5EE
+
+       Sienna
+	   0xA0522D
+
+       Silver
+	   0xC0C0C0
+
+       SkyBlue
+	   0x87CEEB
+
+       SlateBlue
+	   0x6A5ACD
+
+       SlateGray
+	   0x708090
+
+       Snow
+	   0xFFFAFA
+
+       SpringGreen
+	   0x00FF7F
+
+       SteelBlue
+	   0x4682B4
+
+       Tan 0xD2B48C
+
+       Teal
+	   0x008080
+
+       Thistle
+	   0xD8BFD8
+
+       Tomato
+	   0xFF6347
+
+       Turquoise
+	   0x40E0D0
+
+       Violet
+	   0xEE82EE
+
+       Wheat
+	   0xF5DEB3
+
+       White
+	   0xFFFFFF
+
+       WhiteSmoke
+	   0xF5F5F5
+
+       Yellow
+	   0xFFFF00
+
+       YellowGreen
+	   0x9ACD32
+
+   Channel Layout
+       A channel layout specifies the spatial disposition of the channels in a
+       multi-channel audio stream. To specify a channel layout, FFmpeg makes
+       use of a special syntax.
+
+       Individual channels are identified by an id, as given by the table
+       below:
+
+       FL  front left
+
+       FR  front right
+
+       FC  front center
+
+       LFE low frequency
+
+       BL  back left
+
+       BR  back right
+
+       FLC front left-of-center
+
+       FRC front right-of-center
+
+       BC  back center
+
+       SL  side left
+
+       SR  side right
+
+       TC  top center
+
+       TFL top front left
+
+       TFC top front center
+
+       TFR top front right
+
+       TBL top back left
+
+       TBC top back center
+
+       TBR top back right
+
+       DL  downmix left
+
+       DR  downmix right
+
+       WL  wide left
+
+       WR  wide right
+
+       SDL surround direct left
+
+       SDR surround direct right
+
+       LFE2
+	   low frequency 2
+
+       Standard channel layout compositions can be specified by using the
+       following identifiers:
+
+       mono
+	   FC
+
+       stereo
+	   FL+FR
+
+       2.1 FL+FR+LFE
+
+       3.0 FL+FR+FC
+
+       3.0(back)
+	   FL+FR+BC
+
+       4.0 FL+FR+FC+BC
+
+       quad
+	   FL+FR+BL+BR
+
+       quad(side)
+	   FL+FR+SL+SR
+
+       3.1 FL+FR+FC+LFE
+
+       5.0 FL+FR+FC+BL+BR
+
+       5.0(side)
+	   FL+FR+FC+SL+SR
+
+       4.1 FL+FR+FC+LFE+BC
+
+       5.1 FL+FR+FC+LFE+BL+BR
+
+       5.1(side)
+	   FL+FR+FC+LFE+SL+SR
+
+       6.0 FL+FR+FC+BC+SL+SR
+
+       6.0(front)
+	   FL+FR+FLC+FRC+SL+SR
+
+       3.1.2
+	   FL+FR+FC+LFE+TFL+TFR
+
+       hexagonal
+	   FL+FR+FC+BL+BR+BC
+
+       6.1 FL+FR+FC+LFE+BC+SL+SR
+
+       6.1 FL+FR+FC+LFE+BL+BR+BC
+
+       6.1(front)
+	   FL+FR+LFE+FLC+FRC+SL+SR
+
+       7.0 FL+FR+FC+BL+BR+SL+SR
+
+       7.0(front)
+	   FL+FR+FC+FLC+FRC+SL+SR
+
+       7.1 FL+FR+FC+LFE+BL+BR+SL+SR
+
+       7.1(wide)
+	   FL+FR+FC+LFE+BL+BR+FLC+FRC
+
+       7.1(wide-side)
+	   FL+FR+FC+LFE+FLC+FRC+SL+SR
+
+       5.1.2
+	   FL+FR+FC+LFE+BL+BR+TFL+TFR
+
+       octagonal
+	   FL+FR+FC+BL+BR+BC+SL+SR
+
+       cube
+	   FL+FR+BL+BR+TFL+TFR+TBL+TBR
+
+       5.1.4
+	   FL+FR+FC+LFE+BL+BR+TFL+TFR+TBL+TBR
+
+       7.1.2
+	   FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR
+
+       7.1.4
+	   FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBL+TBR
+
+       7.2.3
+	   FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBC+LFE2
+
+       9.1.4
+	   FL+FR+FC+LFE+BL+BR+FLC+FRC+SL+SR+TFL+TFR+TBL+TBR
+
+       hexadecagonal
+	   FL+FR+FC+BL+BR+BC+SL+SR+WL+WR+TBL+TBR+TBC+TFC+TFL+TFR
+
+       downmix
+	   DL+DR
+
+       22.2
+	   FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL+TBC+TBR+LFE2+TSL+TSR+BFC+BFL+BFR
+
+       A custom channel layout can be specified as a sequence of terms,
+       separated by '+'.  Each term can be:
+
+       o   the name of a single channel (e.g. FL, FR, FC, LFE, etc.), each
+	   optionally containing a custom name after a '@', (e.g. FL@Left,
+	   FR@Right, FC@Center, LFE@Low_Frequency, etc.)
+
+       A standard channel layout can be specified by the following:
+
+       o   the name of a single channel (e.g. FL, FR, FC, LFE, etc.)
+
+       o   the name of a standard channel layout (e.g. mono, stereo, 4.0,
+	   quad, 5.0, etc.)
+
+       o   a number of channels, in decimal, followed by 'c', yielding the
+	   default channel layout for that number of channels (see the
+	   function "av_channel_layout_default"). Note that not all channel
+	   counts have a default layout.
+
+       o   a number of channels, in decimal, followed by 'C', yielding an
+	   unknown channel layout with the specified number of channels. Note
+	   that not all channel layout specification strings support unknown
+	   channel layouts.
+
+       o   a channel layout mask, in hexadecimal starting with "0x" (see the
+	   "AV_CH_*" macros in libavutil/channel_layout.h.
+
+       Before libavutil version 53 the trailing character "c" to specify a
+       number of channels was optional, but now it is required, while a
+       channel layout mask can also be specified as a decimal number (if and
+       only if not followed by "c" or "C").
+
+       See also the function "av_channel_layout_from_string" defined in
+       libavutil/channel_layout.h.
+
+EXPRESSION EVALUATION
+       When evaluating an arithmetic expression, FFmpeg uses an internal
+       formula evaluator, implemented through the libavutil/eval.h interface.
+
+       An expression may contain unary, binary operators, constants, and
+       functions.
+
+       Two expressions expr1 and expr2 can be combined to form another
+       expression "expr1;expr2".  expr1 and expr2 are evaluated in turn, and
+       the new expression evaluates to the value of expr2.
+
+       The following binary operators are available: "+", "-", "*", "/", "^".
+
+       The following unary operators are available: "+", "-".
+
+       The following functions are available:
+
+       abs(x)
+	   Compute absolute value of x.
+
+       acos(x)
+	   Compute arccosine of x.
+
+       asin(x)
+	   Compute arcsine of x.
+
+       atan(x)
+	   Compute arctangent of x.
+
+       atan2(y, x)
+	   Compute principal value of the arc tangent of y/x.
+
+       between(x, min, max)
+	   Return 1 if x is greater than or equal to min and lesser than or
+	   equal to max, 0 otherwise.
+
+       bitand(x, y)
+       bitor(x, y)
+	   Compute bitwise and/or operation on x and y.
+
+	   The results of the evaluation of x and y are converted to integers
+	   before executing the bitwise operation.
+
+	   Note that both the conversion to integer and the conversion back to
+	   floating point can lose precision. Beware of unexpected results for
+	   large numbers (usually 2^53 and larger).
+
+       ceil(expr)
+	   Round the value of expression expr upwards to the nearest integer.
+	   For example, "ceil(1.5)" is "2.0".
+
+       clip(x, min, max)
+	   Return the value of x clipped between min and max.
+
+       cos(x)
+	   Compute cosine of x.
+
+       cosh(x)
+	   Compute hyperbolic cosine of x.
+
+       eq(x, y)
+	   Return 1 if x and y are equivalent, 0 otherwise.
+
+       exp(x)
+	   Compute exponential of x (with base "e", the Euler's number).
+
+       floor(expr)
+	   Round the value of expression expr downwards to the nearest
+	   integer. For example, "floor(-1.5)" is "-2.0".
+
+       gauss(x)
+	   Compute Gauss function of x, corresponding to "exp(-x*x/2) /
+	   sqrt(2*PI)".
+
+       gcd(x, y)
+	   Return the greatest common divisor of x and y. If both x and y are
+	   0 or either or both are less than zero then behavior is undefined.
+
+       gt(x, y)
+	   Return 1 if x is greater than y, 0 otherwise.
+
+       gte(x, y)
+	   Return 1 if x is greater than or equal to y, 0 otherwise.
+
+       hypot(x, y)
+	   This function is similar to the C function with the same name; it
+	   returns "sqrt(x*x + y*y)", the length of the hypotenuse of a right
+	   triangle with sides of length x and y, or the distance of the point
+	   (x, y) from the origin.
+
+       if(x, y)
+	   Evaluate x, and if the result is non-zero return the result of the
+	   evaluation of y, return 0 otherwise.
+
+       if(x, y, z)
+	   Evaluate x, and if the result is non-zero return the evaluation
+	   result of y, otherwise the evaluation result of z.
+
+       ifnot(x, y)
+	   Evaluate x, and if the result is zero return the result of the
+	   evaluation of y, return 0 otherwise.
+
+       ifnot(x, y, z)
+	   Evaluate x, and if the result is zero return the evaluation result
+	   of y, otherwise the evaluation result of z.
+
+       isinf(x)
+	   Return 1.0 if x is +/-INFINITY, 0.0 otherwise.
+
+       isnan(x)
+	   Return 1.0 if x is NAN, 0.0 otherwise.
+
+       ld(var)
+	   Load the value of the internal variable with number var, which was
+	   previously stored with st(var, expr).  The function returns the
+	   loaded value.
+
+       lerp(x, y, z)
+	   Return linear interpolation between x and y by amount of z.
+
+       log(x)
+	   Compute natural logarithm of x.
+
+       lt(x, y)
+	   Return 1 if x is lesser than y, 0 otherwise.
+
+       lte(x, y)
+	   Return 1 if x is lesser than or equal to y, 0 otherwise.
+
+       max(x, y)
+	   Return the maximum between x and y.
+
+       min(x, y)
+	   Return the minimum between x and y.
+
+       mod(x, y)
+	   Compute the remainder of division of x by y.
+
+       not(expr)
+	   Return 1.0 if expr is zero, 0.0 otherwise.
+
+       pow(x, y)
+	   Compute the power of x elevated y, it is equivalent to "(x)^(y)".
+
+       print(t)
+       print(t, l)
+	   Print the value of expression t with loglevel l. If l is not
+	   specified then a default log level is used.	Returns the value of
+	   the expression printed.
+
+	   Prints t with loglevel l
+
+       random(idx)
+	   Return a pseudo random value between 0.0 and 1.0. idx is the index
+	   of the internal variable which will be used to save the seed/state.
+
+       randomi(idx, min, max)
+	   Return a pseudo random value in the interval between min and max.
+	   idx is the index of the internal variable which will be used to
+	   save the seed/state.
+
+       root(expr, max)
+	   Find an input value for which the function represented by expr with
+	   argument ld(0) is 0 in the interval 0..max.
+
+	   The expression in expr must denote a continuous function or the
+	   result is undefined.
+
+	   ld(0) is used to represent the function input value, which means
+	   that the given expression will be evaluated multiple times with
+	   various input values that the expression can access through ld(0).
+	   When the expression evaluates to 0 then the corresponding input
+	   value will be returned.
+
+       round(expr)
+	   Round the value of expression expr to the nearest integer. For
+	   example, "round(1.5)" is "2.0".
+
+       sgn(x)
+	   Compute sign of x.
+
+       sin(x)
+	   Compute sine of x.
+
+       sinh(x)
+	   Compute hyperbolic sine of x.
+
+       sqrt(expr)
+	   Compute the square root of expr. This is equivalent to "(expr)^.5".
+
+       squish(x)
+	   Compute expression "1/(1 + exp(4*x))".
+
+       st(var, expr)
+	   Store the value of the expression expr in an internal variable. var
+	   specifies the number of the variable where to store the value, and
+	   it is a value ranging from 0 to 9. The function returns the value
+	   stored in the internal variable.  Note, Variables are currently not
+	   shared between expressions.
+
+       tan(x)
+	   Compute tangent of x.
+
+       tanh(x)
+	   Compute hyperbolic tangent of x.
+
+       taylor(expr, x)
+       taylor(expr, x, id)
+	   Evaluate a Taylor series at x, given an expression representing the
+	   "ld(id)"-th derivative of a function at 0.
+
+	   When the series does not converge the result is undefined.
+
+	   ld(id) is used to represent the derivative order in expr, which
+	   means that the given expression will be evaluated multiple times
+	   with various input values that the expression can access through
+	   "ld(id)". If id is not specified then 0 is assumed.
+
+	   Note, when you have the derivatives at y instead of 0,
+	   "taylor(expr, x-y)" can be used.
+
+       time(0)
+	   Return the current (wallclock) time in seconds.
+
+       trunc(expr)
+	   Round the value of expression expr towards zero to the nearest
+	   integer. For example, "trunc(-1.5)" is "-1.0".
+
+       while(cond, expr)
+	   Evaluate expression expr while the expression cond is non-zero, and
+	   returns the value of the last expr evaluation, or NAN if cond was
+	   always false.
+
+       The following constants are available:
+
+       PI  area of the unit disc, approximately 3.14
+
+       E   exp(1) (Euler's number), approximately 2.718
+
+       PHI golden ratio (1+sqrt(5))/2, approximately 1.618
+
+       Assuming that an expression is considered "true" if it has a non-zero
+       value, note that:
+
+       "*" works like AND
+
+       "+" works like OR
+
+       For example the construct:
+
+	       if (A AND B) then C
+
+       is equivalent to:
+
+	       if(A*B, C)
+
+       In your C code, you can extend the list of unary and binary functions,
+       and define recognized constants, so that they are available for your
+       expressions.
+
+       The evaluator also recognizes the International System unit prefixes.
+       If 'i' is appended after the prefix, binary prefixes are used, which
+       are based on powers of 1024 instead of powers of 1000.  The 'B' postfix
+       multiplies the value by 8, and can be appended after a unit prefix or
+       used alone. This allows using for example 'KB', 'MiB', 'G' and 'B' as
+       number postfix.
+
+       The list of available International System prefixes follows, with
+       indication of the corresponding powers of 10 and of 2.
+
+       y   10^-24 / 2^-80
+
+       z   10^-21 / 2^-70
+
+       a   10^-18 / 2^-60
+
+       f   10^-15 / 2^-50
+
+       p   10^-12 / 2^-40
+
+       n   10^-9 / 2^-30
+
+       u   10^-6 / 2^-20
+
+       m   10^-3 / 2^-10
+
+       c   10^-2
+
+       d   10^-1
+
+       h   10^2
+
+       k   10^3 / 2^10
+
+       K   10^3 / 2^10
+
+       M   10^6 / 2^20
+
+       G   10^9 / 2^30
+
+       T   10^12 / 2^40
+
+       P   10^15 / 2^50
+
+       E   10^18 / 2^60
+
+       Z   10^21 / 2^70
+
+       Y   10^24 / 2^80
+
+CODEC OPTIONS
+       libavcodec provides some generic global options, which can be set on
+       all the encoders and decoders. In addition, each codec may support so-
+       called private options, which are specific for a given codec.
+
+       Sometimes, a global option may only affect a specific kind of codec,
+       and may be nonsensical or ignored by another, so you need to be aware
+       of the meaning of the specified options. Also some options are meant
+       only for decoding or encoding.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the "AVCodecContext" options or
+       using the libavutil/opt.h API for programmatic use.
+
+       The list of supported options follow:
+
+       b integer (encoding,audio,video)
+	   Set bitrate in bits/s. Default value is 200K.
+
+       ab integer (encoding,audio)
+	   Set audio bitrate (in bits/s). Default value is 128K.
+
+       bt integer (encoding,video)
+	   Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate
+	   tolerance specifies how far ratecontrol is willing to deviate from
+	   the target average bitrate value. This is not related to min/max
+	   bitrate. Lowering tolerance too much has an adverse effect on
+	   quality.
+
+       flags flags (decoding/encoding,audio,video,subtitles)
+	   Set generic flags.
+
+	   Possible values:
+
+	   mv4 Use four motion vector by macroblock (mpeg4).
+
+	   qpel
+	       Use 1/4 pel motion compensation.
+
+	   loop
+	       Use loop filter.
+
+	   qscale
+	       Use fixed qscale.
+
+	   pass1
+	       Use internal 2pass ratecontrol in first pass mode.
+
+	   pass2
+	       Use internal 2pass ratecontrol in second pass mode.
+
+	   gray
+	       Only decode/encode grayscale.
+
+	   psnr
+	       Set error[?] variables during encoding.
+
+	   truncated
+	       Input bitstream might be randomly truncated.
+
+	   drop_changed
+	       Don't output frames whose parameters differ from first decoded
+	       frame in stream.  Error AVERROR_INPUT_CHANGED is returned when
+	       a frame is dropped.
+
+	   ildct
+	       Use interlaced DCT.
+
+	   low_delay
+	       Force low delay.
+
+	   global_header
+	       Place global headers in extradata instead of every keyframe.
+
+	   bitexact
+	       Only write platform-, build- and time-independent data. (except
+	       (I)DCT).  This ensures that file and data checksums are
+	       reproducible and match between platforms. Its primary use is
+	       for regression testing.
+
+	   aic Apply H263 advanced intra coding / mpeg4 ac prediction.
+
+	   ilme
+	       Apply interlaced motion estimation.
+
+	   cgop
+	       Use closed gop.
+
+	   output_corrupt
+	       Output even potentially corrupted frames.
+
+       time_base rational number
+	   Set codec time base.
+
+	   It is the fundamental unit of time (in seconds) in terms of which
+	   frame timestamps are represented. For fixed-fps content, timebase
+	   should be "1 / frame_rate" and timestamp increments should be
+	   identically 1.
+
+       g integer (encoding,video)
+	   Set the group of picture (GOP) size. Default value is 12.
+
+       ar integer (decoding/encoding,audio)
+	   Set audio sampling rate (in Hz).
+
+       ac integer (decoding/encoding,audio)
+	   Set number of audio channels.
+
+       cutoff integer (encoding,audio)
+	   Set cutoff bandwidth. (Supported only by selected encoders, see
+	   their respective documentation sections.)
+
+       frame_size integer (encoding,audio)
+	   Set audio frame size.
+
+	   Each submitted frame except the last must contain exactly
+	   frame_size samples per channel. May be 0 when the codec has
+	   CODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is
+	   not restricted. It is set by some decoders to indicate constant
+	   frame size.
+
+       frame_number integer
+	   Set the frame number.
+
+       delay integer
+       qcomp float (encoding,video)
+	   Set video quantizer scale compression (VBR). It is used as a
+	   constant in the ratecontrol equation. Recommended range for default
+	   rc_eq: 0.0-1.0.
+
+       qblur float (encoding,video)
+	   Set video quantizer scale blur (VBR).
+
+       qmin integer (encoding,video)
+	   Set min video quantizer scale (VBR). Must be included between -1
+	   and 69, default value is 2.
+
+       qmax integer (encoding,video)
+	   Set max video quantizer scale (VBR). Must be included between -1
+	   and 1024, default value is 31.
+
+       qdiff integer (encoding,video)
+	   Set max difference between the quantizer scale (VBR).
+
+       bf integer (encoding,video)
+	   Set max number of B frames between non-B-frames.
+
+	   Must be an integer between -1 and 16. 0 means that B-frames are
+	   disabled. If a value of -1 is used, it will choose an automatic
+	   value depending on the encoder.
+
+	   Default value is 0.
+
+       b_qfactor float (encoding,video)
+	   Set qp factor between P and B frames.
+
+       codec_tag integer
+       bug flags (decoding,video)
+	   Workaround not auto detected encoder bugs.
+
+	   Possible values:
+
+	   autodetect
+	   xvid_ilace
+	       Xvid interlacing bug (autodetected if fourcc==XVIX)
+
+	   ump4
+	       (autodetected if fourcc==UMP4)
+
+	   no_padding
+	       padding bug (autodetected)
+
+	   amv
+	   qpel_chroma
+	   std_qpel
+	       old standard qpel (autodetected per fourcc/version)
+
+	   qpel_chroma2
+	   direct_blocksize
+	       direct-qpel-blocksize bug (autodetected per fourcc/version)
+
+	   edge
+	       edge padding bug (autodetected per fourcc/version)
+
+	   hpel_chroma
+	   dc_clip
+	   ms  Workaround various bugs in microsoft broken decoders.
+
+	   trunc
+	       trancated frames
+
+       strict integer (decoding/encoding,audio,video)
+	   Specify how strictly to follow the standards.
+
+	   Possible values:
+
+	   very
+	       strictly conform to an older more strict version of the spec or
+	       reference software
+
+	   strict
+	       strictly conform to all the things in the spec no matter what
+	       consequences
+
+	   normal
+	   unofficial
+	       allow unofficial extensions
+
+	   experimental
+	       allow non standardized experimental things, experimental
+	       (unfinished/work in progress/not well tested) decoders and
+	       encoders.  Note: experimental decoders can pose a security
+	       risk, do not use this for decoding untrusted input.
+
+       b_qoffset float (encoding,video)
+	   Set QP offset between P and B frames.
+
+       err_detect flags (decoding,audio,video)
+	   Set error detection flags.
+
+	   Possible values:
+
+	   crccheck
+	       verify embedded CRCs
+
+	   bitstream
+	       detect bitstream specification deviations
+
+	   buffer
+	       detect improper bitstream length
+
+	   explode
+	       abort decoding on minor error detection
+
+	   ignore_err
+	       ignore decoding errors, and continue decoding.  This is useful
+	       if you want to analyze the content of a video and thus want
+	       everything to be decoded no matter what. This option will not
+	       result in a video that is pleasing to watch in case of errors.
+
+	   careful
+	       consider things that violate the spec and have not been seen in
+	       the wild as errors
+
+	   compliant
+	       consider all spec non compliancies as errors
+
+	   aggressive
+	       consider things that a sane encoder should not do as an error
+
+       has_b_frames integer
+       block_align integer
+       rc_override_count integer
+       maxrate integer (encoding,audio,video)
+	   Set max bitrate tolerance (in bits/s). Requires bufsize to be set.
+
+       minrate integer (encoding,audio,video)
+	   Set min bitrate tolerance (in bits/s). Most useful in setting up a
+	   CBR encode. It is of little use elsewise.
+
+       bufsize integer (encoding,audio,video)
+	   Set ratecontrol buffer size (in bits).
+
+       i_qfactor float (encoding,video)
+	   Set QP factor between P and I frames.
+
+       i_qoffset float (encoding,video)
+	   Set QP offset between P and I frames.
+
+       dct integer (encoding,video)
+	   Set DCT algorithm.
+
+	   Possible values:
+
+	   auto
+	       autoselect a good one (default)
+
+	   fastint
+	       fast integer
+
+	   int accurate integer
+
+	   mmx
+	   altivec
+	   faan
+	       floating point AAN DCT
+
+       lumi_mask float (encoding,video)
+	   Compress bright areas stronger than medium ones.
+
+       tcplx_mask float (encoding,video)
+	   Set temporal complexity masking.
+
+       scplx_mask float (encoding,video)
+	   Set spatial complexity masking.
+
+       p_mask float (encoding,video)
+	   Set inter masking.
+
+       dark_mask float (encoding,video)
+	   Compress dark areas stronger than medium ones.
+
+       idct integer (decoding/encoding,video)
+	   Select IDCT implementation.
+
+	   Possible values:
+
+	   auto
+	   int
+	   simple
+	   simplemmx
+	   simpleauto
+	       Automatically pick a IDCT compatible with the simple one
+
+	   arm
+	   altivec
+	   sh4
+	   simplearm
+	   simplearmv5te
+	   simplearmv6
+	   simpleneon
+	   xvid
+	   faani
+	       floating point AAN IDCT
+
+       slice_count integer
+       ec flags (decoding,video)
+	   Set error concealment strategy.
+
+	   Possible values:
+
+	   guess_mvs
+	       iterative motion vector (MV) search (slow)
+
+	   deblock
+	       use strong deblock filter for damaged MBs
+
+	   favor_inter
+	       favor predicting from the previous frame instead of the current
+
+       bits_per_coded_sample integer
+       aspect rational number (encoding,video)
+	   Set sample aspect ratio.
+
+       sar rational number (encoding,video)
+	   Set sample aspect ratio. Alias to aspect.
+
+       debug flags (decoding/encoding,audio,video,subtitles)
+	   Print specific debug info.
+
+	   Possible values:
+
+	   pict
+	       picture info
+
+	   rc  rate control
+
+	   bitstream
+	   mb_type
+	       macroblock (MB) type
+
+	   qp  per-block quantization parameter (QP)
+
+	   dct_coeff
+	   green_metadata
+	       display complexity metadata for the upcoming frame, GoP or for
+	       a given duration.
+
+	   skip
+	   startcode
+	   er  error recognition
+
+	   mmco
+	       memory management control operations (H.264)
+
+	   bugs
+	   buffers
+	       picture buffer allocations
+
+	   thread_ops
+	       threading operations
+
+	   nomc
+	       skip motion compensation
+
+       cmp integer (encoding,video)
+	   Set full pel me compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       subcmp integer (encoding,video)
+	   Set sub pel me compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       mbcmp integer (encoding,video)
+	   Set macroblock compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       ildctcmp integer (encoding,video)
+	   Set interlaced dct compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       dia_size integer (encoding,video)
+	   Set diamond type & size for motion estimation.
+
+	   (1024, INT_MAX)
+	       full motion estimation(slowest)
+
+	   (768, 1024]
+	       umh motion estimation
+
+	   (512, 768]
+	       hex motion estimation
+
+	   (256, 512]
+	       l2s diamond motion estimation
+
+	   [2,256]
+	       var diamond motion estimation
+
+	   (-1,  2)
+	       small diamond motion estimation
+
+	   -1  funny diamond motion estimation
+
+	   (INT_MIN, -1)
+	       sab diamond motion estimation
+
+       last_pred integer (encoding,video)
+	   Set amount of motion predictors from the previous frame.
+
+       precmp integer (encoding,video)
+	   Set pre motion estimation compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       pre_dia_size integer (encoding,video)
+	   Set diamond type & size for motion estimation pre-pass.
+
+       subq integer (encoding,video)
+	   Set sub pel motion estimation quality.
+
+       me_range integer (encoding,video)
+	   Set limit motion vectors range (1023 for DivX player).
+
+       global_quality integer (encoding,audio,video)
+       slice_flags integer
+       mbd integer (encoding,video)
+	   Set macroblock decision algorithm (high quality mode).
+
+	   Possible values:
+
+	   simple
+	       use mbcmp (default)
+
+	   bits
+	       use fewest bits
+
+	   rd  use best rate distortion
+
+       rc_init_occupancy integer (encoding,video)
+	   Set number of bits which should be loaded into the rc buffer before
+	   decoding starts.
+
+       flags2 flags (decoding/encoding,audio,video,subtitles)
+	   Possible values:
+
+	   fast
+	       Allow non spec compliant speedup tricks.
+
+	   noout
+	       Skip bitstream encoding.
+
+	   ignorecrop
+	       Ignore cropping information from sps.
+
+	   local_header
+	       Place global headers at every keyframe instead of in extradata.
+
+	   chunks
+	       Frame data might be split into multiple chunks.
+
+	   showall
+	       Show all frames before the first keyframe.
+
+	   export_mvs
+	       Export motion vectors into frame side-data (see
+	       "AV_FRAME_DATA_MOTION_VECTORS") for codecs that support it. See
+	       also doc/examples/export_mvs.c.
+
+	   skip_manual
+	       Do not skip samples and export skip information as frame side
+	       data.
+
+	   ass_ro_flush_noop
+	       Do not reset ASS ReadOrder field on flush.
+
+	   icc_profiles
+	       Generate/parse embedded ICC profiles from/to colorimetry tags.
+
+       export_side_data flags (decoding/encoding,audio,video,subtitles)
+	   Possible values:
+
+	   mvs Export motion vectors into frame side-data (see
+	       "AV_FRAME_DATA_MOTION_VECTORS") for codecs that support it. See
+	       also doc/examples/export_mvs.c.
+
+	   prft
+	       Export encoder Producer Reference Time into packet side-data
+	       (see "AV_PKT_DATA_PRFT") for codecs that support it.
+
+	   venc_params
+	       Export video encoding parameters through frame side data (see
+	       "AV_FRAME_DATA_VIDEO_ENC_PARAMS") for codecs that support it.
+	       At present, those are H.264 and VP9.
+
+	   film_grain
+	       Export film grain parameters through frame side data (see
+	       "AV_FRAME_DATA_FILM_GRAIN_PARAMS").  Supported at present by
+	       AV1 decoders.
+
+       threads integer (decoding/encoding,video)
+	   Set the number of threads to be used, in case the selected codec
+	   implementation supports multi-threading.
+
+	   Possible values:
+
+	   auto, 0
+	       automatically select the number of threads to set
+
+	   Default value is auto.
+
+       dc integer (encoding,video)
+	   Set intra_dc_precision.
+
+       nssew integer (encoding,video)
+	   Set nsse weight.
+
+       skip_top integer (decoding,video)
+	   Set number of macroblock rows at the top which are skipped.
+
+       skip_bottom integer (decoding,video)
+	   Set number of macroblock rows at the bottom which are skipped.
+
+       profile integer (encoding,audio,video)
+	   Set encoder codec profile. Default value is unknown. Encoder
+	   specific profiles are documented in the relevant encoder
+	   documentation.
+
+       level integer (encoding,audio,video)
+	   Set the encoder level. This level depends on the specific codec,
+	   and might correspond to the profile level. It is set by default to
+	   unknown.
+
+	   Possible values:
+
+	   unknown
+       lowres integer (decoding,audio,video)
+	   Decode at 1= 1/2, 2=1/4, 3=1/8 resolutions.
+
+       mblmin integer (encoding,video)
+	   Set min macroblock lagrange factor (VBR).
+
+       mblmax integer (encoding,video)
+	   Set max macroblock lagrange factor (VBR).
+
+       skip_loop_filter integer (decoding,video)
+       skip_idct	integer (decoding,video)
+       skip_frame	integer (decoding,video)
+	   Make decoder discard processing depending on the frame type
+	   selected by the option value.
+
+	   skip_loop_filter skips frame loop filtering, skip_idct skips frame
+	   IDCT/dequantization, skip_frame skips decoding.
+
+	   Possible values:
+
+	   none
+	       Discard no frame.
+
+	   default
+	       Discard useless frames like 0-sized frames.
+
+	   noref
+	       Discard all non-reference frames.
+
+	   bidir
+	       Discard all bidirectional frames.
+
+	   nokey
+	       Discard all frames excepts keyframes.
+
+	   nointra
+	       Discard all frames except I frames.
+
+	   all Discard all frames.
+
+	   Default value is default.
+
+       bidir_refine integer (encoding,video)
+	   Refine the two motion vectors used in bidirectional macroblocks.
+
+       keyint_min integer (encoding,video)
+	   Set minimum interval between IDR-frames.
+
+       refs integer (encoding,video)
+	   Set reference frames to consider for motion compensation.
+
+       trellis integer (encoding,audio,video)
+	   Set rate-distortion optimal quantization.
+
+       mv0_threshold integer (encoding,video)
+       compression_level integer (encoding,audio,video)
+       bits_per_raw_sample integer
+       channel_layout integer (decoding/encoding,audio)
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       rc_max_vbv_use float (encoding,video)
+       rc_min_vbv_use float (encoding,video)
+       color_primaries integer (decoding/encoding,video)
+	   Possible values:
+
+	   bt709
+	       BT.709
+
+	   bt470m
+	       BT.470 M
+
+	   bt470bg
+	       BT.470 BG
+
+	   smpte170m
+	       SMPTE 170 M
+
+	   smpte240m
+	       SMPTE 240 M
+
+	   film
+	       Film
+
+	   bt2020
+	       BT.2020
+
+	   smpte428
+	   smpte428_1
+	       SMPTE ST 428-1
+
+	   smpte431
+	       SMPTE 431-2
+
+	   smpte432
+	       SMPTE 432-1
+
+	   jedec-p22
+	       JEDEC P22
+
+       color_trc integer (decoding/encoding,video)
+	   Possible values:
+
+	   bt709
+	       BT.709
+
+	   gamma22
+	       BT.470 M
+
+	   gamma28
+	       BT.470 BG
+
+	   smpte170m
+	       SMPTE 170 M
+
+	   smpte240m
+	       SMPTE 240 M
+
+	   linear
+	       Linear
+
+	   log
+	   log100
+	       Log
+
+	   log_sqrt
+	   log316
+	       Log square root
+
+	   iec61966_2_4
+	   iec61966-2-4
+	       IEC 61966-2-4
+
+	   bt1361
+	   bt1361e
+	       BT.1361
+
+	   iec61966_2_1
+	   iec61966-2-1
+	       IEC 61966-2-1
+
+	   bt2020_10
+	   bt2020_10bit
+	       BT.2020 - 10 bit
+
+	   bt2020_12
+	   bt2020_12bit
+	       BT.2020 - 12 bit
+
+	   smpte2084
+	       SMPTE ST 2084
+
+	   smpte428
+	   smpte428_1
+	       SMPTE ST 428-1
+
+	   arib-std-b67
+	       ARIB STD-B67
+
+       colorspace integer (decoding/encoding,video)
+	   Possible values:
+
+	   rgb RGB
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt470bg
+	       BT.470 BG
+
+	   smpte170m
+	       SMPTE 170 M
+
+	   smpte240m
+	       SMPTE 240 M
+
+	   ycocg
+	       YCOCG
+
+	   bt2020nc
+	   bt2020_ncl
+	       BT.2020 NCL
+
+	   bt2020c
+	   bt2020_cl
+	       BT.2020 CL
+
+	   smpte2085
+	       SMPTE 2085
+
+	   chroma-derived-nc
+	       Chroma-derived NCL
+
+	   chroma-derived-c
+	       Chroma-derived CL
+
+	   ictcp
+	       ICtCp
+
+       color_range integer (decoding/encoding,video)
+	   If used as input parameter, it serves as a hint to the decoder,
+	   which color_range the input has.  Possible values:
+
+	   tv
+	   mpeg
+	   limited
+	       MPEG (219*2^(n-8))
+
+	   pc
+	   jpeg
+	   full
+	       JPEG (2^n-1)
+
+       chroma_sample_location integer (decoding/encoding,video)
+	   Possible values:
+
+	   left
+	   center
+	   topleft
+	   top
+	   bottomleft
+	   bottom
+       log_level_offset integer
+	   Set the log level offset.
+
+       slices integer (encoding,video)
+	   Number of slices, used in parallelized encoding.
+
+       thread_type flags (decoding/encoding,video)
+	   Select which multithreading methods to use.
+
+	   Use of frame will increase decoding delay by one frame per thread,
+	   so clients which cannot provide future frames should not use it.
+
+	   Possible values:
+
+	   slice
+	       Decode more than one part of a single frame at once.
+
+	       Multithreading using slices works only when the video was
+	       encoded with slices.
+
+	   frame
+	       Decode more than one frame at once.
+
+	   Default value is slice+frame.
+
+       audio_service_type integer (encoding,audio)
+	   Set audio service type.
+
+	   Possible values:
+
+	   ma  Main Audio Service
+
+	   ef  Effects
+
+	   vi  Visually Impaired
+
+	   hi  Hearing Impaired
+
+	   di  Dialogue
+
+	   co  Commentary
+
+	   em  Emergency
+
+	   vo  Voice Over
+
+	   ka  Karaoke
+
+       request_sample_fmt sample_fmt (decoding,audio)
+	   Set sample format audio decoders should prefer. Default value is
+	   "none".
+
+       pkt_timebase rational number
+       sub_charenc encoding (decoding,subtitles)
+	   Set the input subtitles character encoding.
+
+       field_order  field_order (video)
+	   Set/override the field order of the video.  Possible values:
+
+	   progressive
+	       Progressive video
+
+	   tt  Interlaced video, top field coded and displayed first
+
+	   bb  Interlaced video, bottom field coded and displayed first
+
+	   tb  Interlaced video, top coded first, bottom displayed first
+
+	   bt  Interlaced video, bottom coded first, top displayed first
+
+       skip_alpha bool (decoding,video)
+	   Set to 1 to disable processing alpha (transparency). This works
+	   like the gray flag in the flags option which skips chroma
+	   information instead of alpha. Default is 0.
+
+       codec_whitelist list (input)
+	   "," separated list of allowed decoders. By default all are allowed.
+
+       dump_separator string (input)
+	   Separator used to separate the fields printed on the command line
+	   about the Stream parameters.  For example, to separate the fields
+	   with newlines and indentation:
+
+		   ffprobe -dump_separator "
+					     "	-i ~/videos/matrixbench_mpeg2.mpg
+
+       max_pixels integer (decoding/encoding,video)
+	   Maximum number of pixels per image. This value can be used to avoid
+	   out of memory failures due to large images.
+
+       apply_cropping bool (decoding,video)
+	   Enable cropping if cropping parameters are multiples of the
+	   required alignment for the left and top parameters. If the
+	   alignment is not met the cropping will be partially applied to
+	   maintain alignment.	Default is 1 (enabled).  Note: The required
+	   alignment depends on if "AV_CODEC_FLAG_UNALIGNED" is set and the
+	   CPU. "AV_CODEC_FLAG_UNALIGNED" cannot be changed from the command
+	   line. Also hardware decoders will not apply left/top Cropping.
+
+DECODERS
+       Decoders are configured elements in FFmpeg which allow the decoding of
+       multimedia streams.
+
+       When you configure your FFmpeg build, all the supported native decoders
+       are enabled by default. Decoders requiring an external library must be
+       enabled manually via the corresponding "--enable-lib" option. You can
+       list all available decoders using the configure option
+       "--list-decoders".
+
+       You can disable all the decoders with the configure option
+       "--disable-decoders" and selectively enable / disable single decoders
+       with the options "--enable-decoder=DECODER" /
+       "--disable-decoder=DECODER".
+
+       The option "-decoders" of the ff* tools will display the list of
+       enabled decoders.
+
+VIDEO DECODERS
+       A description of some of the currently available video decoders
+       follows.
+
+   av1
+       AOMedia Video 1 (AV1) decoder.
+
+       Options
+
+       operating_point
+	   Select an operating point of a scalable AV1 bitstream (0 - 31).
+	   Default is 0.
+
+   rawvideo
+       Raw video decoder.
+
+       This decoder decodes rawvideo streams.
+
+       Options
+
+       top top_field_first
+	   Specify the assumed field type of the input video.
+
+	   -1  the video is assumed to be progressive (default)
+
+	   0   bottom-field-first is assumed
+
+	   1   top-field-first is assumed
+
+   libdav1d
+       dav1d AV1 decoder.
+
+       libdav1d allows libavcodec to decode the AOMedia Video 1 (AV1) codec.
+       Requires the presence of the libdav1d headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libdav1d".
+
+       Options
+
+       The following options are supported by the libdav1d wrapper.
+
+       framethreads
+	   Set amount of frame threads to use during decoding. The default
+	   value is 0 (autodetect).  This option is deprecated for libdav1d >=
+	   1.0 and will be removed in the future. Use the option
+	   "max_frame_delay" and the global option "threads" instead.
+
+       tilethreads
+	   Set amount of tile threads to use during decoding. The default
+	   value is 0 (autodetect).  This option is deprecated for libdav1d >=
+	   1.0 and will be removed in the future. Use the global option
+	   "threads" instead.
+
+       max_frame_delay
+	   Set max amount of frames the decoder may buffer internally. The
+	   default value is 0 (autodetect).
+
+       filmgrain
+	   Apply film grain to the decoded video if present in the bitstream.
+	   Defaults to the internal default of the library.  This option is
+	   deprecated and will be removed in the future. See the global option
+	   "export_side_data" to export Film Grain parameters instead of
+	   applying it.
+
+       oppoint
+	   Select an operating point of a scalable AV1 bitstream (0 - 31).
+	   Defaults to the internal default of the library.
+
+       alllayers
+	   Output all spatial layers of a scalable AV1 bitstream. The default
+	   value is false.
+
+   libdavs2
+       AVS2-P2/IEEE1857.4 video decoder wrapper.
+
+       This decoder allows libavcodec to decode AVS2 streams with davs2
+       library.
+
+   libuavs3d
+       AVS3-P2/IEEE1857.10 video decoder.
+
+       libuavs3d allows libavcodec to decode AVS3 streams.  Requires the
+       presence of the libuavs3d headers and library during configuration.
+       You need to explicitly configure the build with "--enable-libuavs3d".
+
+       Options
+
+       The following option is supported by the libuavs3d wrapper.
+
+       frame_threads
+	   Set amount of frame threads to use during decoding. The default
+	   value is 0 (autodetect).
+
+   libxevd
+       eXtra-fast Essential Video Decoder (XEVD) MPEG-5 EVC decoder wrapper.
+
+       This decoder requires the presence of the libxevd headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libxevd.
+
+       The xevd project website is at <https://github.com/mpeg5/xevd>.
+
+       Options
+
+       The following options are supported by the libxevd wrapper.  The xevd-
+       equivalent options or values are listed in parentheses for easy
+       migration.
+
+       To get a more accurate and extensive documentation of the libxevd
+       options, invoke the command  "xevd_app --help" or consult the libxevd
+       documentation.
+
+       threads (threads)
+	   Force to use a specific number of threads
+
+   QSV Decoders
+       The family of Intel QuickSync Video decoders (VC1, MPEG-2, H.264, HEVC,
+       JPEG/MJPEG, VP8, VP9, AV1).
+
+       Common Options
+
+       The following options are supported by all qsv decoders.
+
+       async_depth
+	   Internal parallelization depth, the higher the value the higher the
+	   latency.
+
+       gpu_copy
+	   A GPU-accelerated copy between video and system memory
+
+	   default
+	   on
+	   off
+
+       HEVC Options
+
+       Extra options for hevc_qsv.
+
+       load_plugin
+	   A user plugin to load in an internal session
+
+	   none
+	   hevc_sw
+	   hevc_hw
+       load_plugins
+	   A :-separate list of hexadecimal plugin UIDs to load in an internal
+	   session
+
+   v210
+       Uncompressed 4:2:2 10-bit decoder.
+
+       Options
+
+       custom_stride
+	   Set the line size of the v210 data in bytes. The default value is 0
+	   (autodetect). You can use the special -1 value for a strideless
+	   v210 as seen in BOXX files.
+
+AUDIO DECODERS
+       A description of some of the currently available audio decoders
+       follows.
+
+   ac3
+       AC-3 audio decoder.
+
+       This decoder implements part of ATSC A/52:2010 and ETSI TS 102 366, as
+       well as the undocumented RealAudio 3 (a.k.a. dnet).
+
+       AC-3 Decoder Options
+
+       -drc_scale value
+	   Dynamic Range Scale Factor. The factor to apply to dynamic range
+	   values from the AC-3 stream. This factor is applied exponentially.
+	   The default value is 1.  There are 3 notable scale factor ranges:
+
+	   drc_scale == 0
+	       DRC disabled. Produces full range audio.
+
+	   0 < drc_scale <= 1
+	       DRC enabled.  Applies a fraction of the stream DRC value.
+	       Audio reproduction is between full range and full compression.
+
+	   drc_scale > 1
+	       DRC enabled. Applies drc_scale asymmetrically.  Loud sounds are
+	       fully compressed.  Soft sounds are enhanced.
+
+   flac
+       FLAC audio decoder.
+
+       This decoder aims to implement the complete FLAC specification from
+       Xiph.
+
+       FLAC Decoder options
+
+       -use_buggy_lpc
+	   The lavc FLAC encoder used to produce buggy streams with high lpc
+	   values (like the default value). This option makes it possible to
+	   decode such streams correctly by using lavc's old buggy lpc logic
+	   for decoding.
+
+   ffwavesynth
+       Internal wave synthesizer.
+
+       This decoder generates wave patterns according to predefined sequences.
+       Its use is purely internal and the format of the data it accepts is not
+       publicly documented.
+
+   libcelt
+       libcelt decoder wrapper.
+
+       libcelt allows libavcodec to decode the Xiph CELT ultra-low delay audio
+       codec.  Requires the presence of the libcelt headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libcelt".
+
+   libgsm
+       libgsm decoder wrapper.
+
+       libgsm allows libavcodec to decode the GSM full rate audio codec.
+       Requires the presence of the libgsm headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libgsm".
+
+       This decoder supports both the ordinary GSM and the Microsoft variant.
+
+   libilbc
+       libilbc decoder wrapper.
+
+       libilbc allows libavcodec to decode the Internet Low Bitrate Codec
+       (iLBC) audio codec. Requires the presence of the libilbc headers and
+       library during configuration. You need to explicitly configure the
+       build with "--enable-libilbc".
+
+       Options
+
+       The following option is supported by the libilbc wrapper.
+
+       enhance
+	   Enable the enhancement of the decoded audio when set to 1. The
+	   default value is 0 (disabled).
+
+   libopencore-amrnb
+       libopencore-amrnb decoder wrapper.
+
+       libopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate
+       Narrowband audio codec. Using it requires the presence of the
+       libopencore-amrnb headers and library during configuration. You need to
+       explicitly configure the build with "--enable-libopencore-amrnb".
+
+       An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB
+       without this library.
+
+   libopencore-amrwb
+       libopencore-amrwb decoder wrapper.
+
+       libopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate
+       Wideband audio codec. Using it requires the presence of the
+       libopencore-amrwb headers and library during configuration. You need to
+       explicitly configure the build with "--enable-libopencore-amrwb".
+
+       An FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB
+       without this library.
+
+   libopus
+       libopus decoder wrapper.
+
+       libopus allows libavcodec to decode the Opus Interactive Audio Codec.
+       Requires the presence of the libopus headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libopus".
+
+       An FFmpeg native decoder for Opus exists, so users can decode Opus
+       without this library.
+
+SUBTITLES DECODERS
+   libaribb24
+       ARIB STD-B24 caption decoder.
+
+       Implements profiles A and C of the ARIB STD-B24 standard.
+
+       libaribb24 Decoder Options
+
+       -aribb24-base-path path
+	   Sets the base path for the libaribb24 library. This is utilized for
+	   reading of configuration files (for custom unicode conversions),
+	   and for dumping of non-text symbols as images under that location.
+
+	   Unset by default.
+
+       -aribb24-skip-ruby-text boolean
+	   Tells the decoder wrapper to skip text blocks that contain half-
+	   height ruby text.
+
+	   Enabled by default.
+
+   libaribcaption
+       Yet another ARIB STD-B24 caption decoder using external libaribcaption
+       library.
+
+       Implements profiles A and C of the Japanse ARIB STD-B24 standard,
+       Brazilian ABNT NBR 15606-1, and Philippines version of ISDB-T.
+
+       Requires the presence of the libaribcaption headers and library
+       (<https://github.com/xqq/libaribcaption>) during configuration.	You
+       need to explicitly configure the build with "--enable-libaribcaption".
+       If both libaribb24 and libaribcaption are enabled, libaribcaption
+       decoder precedes.
+
+       libaribcaption Decoder Options
+
+       -sub_type subtitle_type
+	   Specifies the format of the decoded subtitles.
+
+	   bitmap
+	       Graphical image.
+
+	   ass ASS formatted text.
+
+	   text
+	       Simple text based output without formatting.
+
+	   The default is ass as same as libaribb24 decoder.  Some present
+	   players (e.g., mpv) expect ASS format for ARIB caption.
+
+       -caption_encoding encoding_scheme
+	   Specifies the encoding scheme of input subtitle text.
+
+	   auto
+	       Automatically detect text encoding (default).
+
+	   jis 8bit-char JIS encoding defined in ARIB STD B24.	This encoding
+	       used in Japan for ISDB captions.
+
+	   utf8
+	       UTF-8 encoding defined in ARIB STD B24.	This encoding is used
+	       in Philippines for ISDB-T captions.
+
+	   latin
+	       Latin character encoding defined in ABNT NBR 15606-1.  This
+	       encoding is used in South America for SBTVD / ISDB-Tb captions.
+
+       -font font_name[,font_name2,...]
+	   Specify comma-separated list of font family names to be used for
+	   bitmap or ass type subtitle rendering.  Only first font name is
+	   used for ass type subtitle.
+
+	   If not specified, use internaly defined default font family.
+
+       -ass_single_rect boolean
+	   ARIB STD-B24 specifies that some captions may be displayed at
+	   different positions at a time (multi-rectangle subtitle).  Since
+	   some players (e.g., old mpv) can't handle multiple ASS rectangles
+	   in a single AVSubtitle, or multiple ASS rectangles of indeterminate
+	   duration with the same start timestamp, this option can change the
+	   behavior so that all the texts are displayed in a single ASS
+	   rectangle.
+
+	   The default is false.
+
+	   If your player cannot handle AVSubtitles with multiple ASS
+	   rectangles properly, set this option to true or define
+	   ASS_SINGLE_RECT=1 to change default behavior at compilation.
+
+       -force_outline_text boolean
+	   Specify whether always render outline text for all characters
+	   regardless of the indication by charactor style.
+
+	   The default is false.
+
+       -outline_width number (0.0 - 3.0)
+	   Specify width for outline text, in dots (relative).
+
+	   The default is 1.5.
+
+       -ignore_background boolean
+	   Specify whether to ignore background color rendering.
+
+	   The default is false.
+
+       -ignore_ruby boolean
+	   Specify whether to ignore rendering for ruby-like (furigana)
+	   characters.
+
+	   The default is false.
+
+       -replace_drcs boolean
+	   Specify whether to render replaced DRCS characters as Unicode
+	   characters.
+
+	   The default is true.
+
+       -replace_msz_ascii boolean
+	   Specify whether to replace MSZ (Middle Size; half width) fullwidth
+	   alphanumerics with halfwidth alphanumerics.
+
+	   The default is true.
+
+       -replace_msz_japanese boolean
+	   Specify whether to replace some MSZ (Middle Size; half width)
+	   fullwidth japanese special characters with halfwidth ones.
+
+	   The default is true.
+
+       -replace_msz_glyph boolean
+	   Specify whether to replace MSZ (Middle Size; half width) characters
+	   with halfwidth glyphs if the fonts supports it.  This option works
+	   under FreeType or DirectWrite renderer with Adobe-Japan1 compliant
+	   fonts.  e.g., IBM Plex Sans JP, Morisawa BIZ UDGothic, Morisawa BIZ
+	   UDMincho, Yu Gothic, Yu Mincho, and Meiryo.
+
+	   The default is true.
+
+       -canvas_size image_size
+	   Specify the resolution of the canvas to render subtitles to;
+	   usually, this should be frame size of input video.  This only
+	   applies when "-subtitle_type" is set to bitmap.
+
+	   The libaribcaption decoder assumes input frame size for bitmap
+	   rendering as below:
+
+	   1.  PROFILE_A : 1440 x 1080 with SAR (PAR) 4:3
+
+	   2.  PROFILE_C : 320 x 180 with SAR (PAR) 1:1
+
+	   If actual frame size of input video does not match above
+	   assumption, the rendered captions may be distorted.	To make the
+	   captions undistorted, add "-canvas_size" option to specify actual
+	   input video size.
+
+	   Note that the "-canvas_size" option is not required for video with
+	   different size but same aspect ratio.  In such cases, the caption
+	   will be stretched or shrunk to actual video size if "-canvas_size"
+	   option is not specified.  If "-canvas_size" option is specified
+	   with different size, the caption will be stretched or shrunk as
+	   specified size with calculated SAR.
+
+       libaribcaption decoder usage examples
+
+       Display MPEG-TS file with ARIB subtitle by "ffplay" tool:
+
+	       ffplay -sub_type bitmap MPEG.TS
+
+       Display MPEG-TS file with input frame size 1920x1080 by "ffplay" tool:
+
+	       ffplay -sub_type bitmap -canvas_size 1920x1080 MPEG.TS
+
+       Embed ARIB subtitle in transcoded video:
+
+	       ffmpeg -sub_type bitmap -i src.m2t -filter_complex "[0:v][0:s]overlay" -vcodec h264 dest.mp4
+
+   dvbsub
+       Options
+
+       compute_clut
+	   -2  Compute clut once if no matching CLUT is in the stream.
+
+	   -1  Compute clut if no matching CLUT is in the stream.
+
+	   0   Never compute CLUT
+
+	   1   Always compute CLUT and override the one provided in the
+	       stream.
+
+       dvb_substream
+	   Selects the dvb substream, or all substreams if -1 which is
+	   default.
+
+   dvdsub
+       This codec decodes the bitmap subtitles used in DVDs; the same
+       subtitles can also be found in VobSub file pairs and in some Matroska
+       files.
+
+       Options
+
+       palette
+	   Specify the global palette used by the bitmaps. When stored in
+	   VobSub, the palette is normally specified in the index file; in
+	   Matroska, the palette is stored in the codec extra-data in the same
+	   format as in VobSub. In DVDs, the palette is stored in the IFO
+	   file, and therefore not available when reading from dumped VOB
+	   files.
+
+	   The format for this option is a string containing 16 24-bits
+	   hexadecimal numbers (without 0x prefix) separated by commas, for
+	   example "0d00ee, ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b,
+	   0d617a, 7b7b7b, d1d1d1, 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c,
+	   7c127b".
+
+       ifo_palette
+	   Specify the IFO file from which the global palette is obtained.
+	   (experimental)
+
+       forced_subs_only
+	   Only decode subtitle entries marked as forced. Some titles have
+	   forced and non-forced subtitles in the same track. Setting this
+	   flag to 1 will only keep the forced subtitles. Default value is 0.
+
+   libzvbi-teletext
+       Libzvbi allows libavcodec to decode DVB teletext pages and DVB teletext
+       subtitles. Requires the presence of the libzvbi headers and library
+       during configuration. You need to explicitly configure the build with
+       "--enable-libzvbi".
+
+       Options
+
+       txt_page
+	   List of teletext page numbers to decode. Pages that do not match
+	   the specified list are dropped. You may use the special "*" string
+	   to match all pages, or "subtitle" to match all subtitle pages.
+	   Default value is *.
+
+       txt_default_region
+	   Set default character set used for decoding, a value between 0 and
+	   87 (see ETS 300 706, Section 15, Table 32). Default value is -1,
+	   which does not override the libzvbi default. This option is needed
+	   for some legacy level 1.0 transmissions which cannot signal the
+	   proper charset.
+
+       txt_chop_top
+	   Discards the top teletext line. Default value is 1.
+
+       txt_format
+	   Specifies the format of the decoded subtitles.
+
+	   bitmap
+	       The default format, you should use this for teletext pages,
+	       because certain graphics and colors cannot be expressed in
+	       simple text or even ASS.
+
+	   text
+	       Simple text based output without formatting.
+
+	   ass Formatted ASS output, subtitle pages and teletext pages are
+	       returned in different styles, subtitle pages are stripped down
+	       to text, but an effort is made to keep the text alignment and
+	       the formatting.
+
+       txt_left
+	   X offset of generated bitmaps, default is 0.
+
+       txt_top
+	   Y offset of generated bitmaps, default is 0.
+
+       txt_chop_spaces
+	   Chops leading and trailing spaces and removes empty lines from the
+	   generated text. This option is useful for teletext based subtitles
+	   where empty spaces may be present at the start or at the end of the
+	   lines or empty lines may be present between the subtitle lines
+	   because of double-sized teletext characters.  Default value is 1.
+
+       txt_duration
+	   Sets the display duration of the decoded teletext pages or
+	   subtitles in milliseconds. Default value is -1 which means infinity
+	   or until the next subtitle event comes.
+
+       txt_transparent
+	   Force transparent background of the generated teletext bitmaps.
+	   Default value is 0 which means an opaque background.
+
+       txt_opacity
+	   Sets the opacity (0-255) of the teletext background. If
+	   txt_transparent is not set, it only affects characters between a
+	   start box and an end box, typically subtitles. Default value is 0
+	   if txt_transparent is set, 255 otherwise.
+
+ENCODERS
+       Encoders are configured elements in FFmpeg which allow the encoding of
+       multimedia streams.
+
+       When you configure your FFmpeg build, all the supported native encoders
+       are enabled by default. Encoders requiring an external library must be
+       enabled manually via the corresponding "--enable-lib" option. You can
+       list all available encoders using the configure option
+       "--list-encoders".
+
+       You can disable all the encoders with the configure option
+       "--disable-encoders" and selectively enable / disable single encoders
+       with the options "--enable-encoder=ENCODER" /
+       "--disable-encoder=ENCODER".
+
+       The option "-encoders" of the ff* tools will display the list of
+       enabled encoders.
+
+AUDIO ENCODERS
+       A description of some of the currently available audio encoders
+       follows.
+
+   aac
+       Advanced Audio Coding (AAC) encoder.
+
+       This encoder is the default AAC encoder, natively implemented into
+       FFmpeg.
+
+       Options
+
+       b   Set bit rate in bits/s. Setting this automatically activates
+	   constant bit rate (CBR) mode. If this option is unspecified it is
+	   set to 128kbps.
+
+       q   Set quality for variable bit rate (VBR) mode. This option is valid
+	   only using the ffmpeg command-line tool. For library interface
+	   users, use global_quality.
+
+       cutoff
+	   Set cutoff frequency. If unspecified will allow the encoder to
+	   dynamically adjust the cutoff to improve clarity on low bitrates.
+
+       aac_coder
+	   Set AAC encoder coding method. Possible values:
+
+	   twoloop
+	       Two loop searching (TLS) method. This is the default method.
+
+	       This method first sets quantizers depending on band thresholds
+	       and then tries to find an optimal combination by adding or
+	       subtracting a specific value from all quantizers and adjusting
+	       some individual quantizer a little.  Will tune itself based on
+	       whether aac_is, aac_ms and aac_pns are enabled.
+
+	   anmr
+	       Average noise to mask ratio (ANMR) trellis-based solution.
+
+	       This is an experimental coder which currently produces a lower
+	       quality, is more unstable and is slower than the default
+	       twoloop coder but has potential.  Currently has no support for
+	       the aac_is or aac_pns options.  Not currently recommended.
+
+	   fast
+	       Constant quantizer method.
+
+	       Uses a cheaper version of twoloop algorithm that doesn't try to
+	       do as many clever adjustments. Worse with low bitrates (less
+	       than 64kbps), but is better and much faster at higher bitrates.
+
+       aac_ms
+	   Sets mid/side coding mode. The default value of "auto" will
+	   automatically use M/S with bands which will benefit from such
+	   coding. Can be forced for all bands using the value "enable", which
+	   is mainly useful for debugging or disabled using "disable".
+
+       aac_is
+	   Sets intensity stereo coding tool usage. By default, it's enabled
+	   and will automatically toggle IS for similar pairs of stereo bands
+	   if it's beneficial.	Can be disabled for debugging by setting the
+	   value to "disable".
+
+       aac_pns
+	   Uses perceptual noise substitution to replace low entropy high
+	   frequency bands with imperceptible white noise during the decoding
+	   process. By default, it's enabled, but can be disabled for
+	   debugging purposes by using "disable".
+
+       aac_tns
+	   Enables the use of a multitap FIR filter which spans through the
+	   high frequency bands to hide quantization noise during the encoding
+	   process and is reverted by the decoder. As well as decreasing
+	   unpleasant artifacts in the high range this also reduces the
+	   entropy in the high bands and allows for more bits to be used by
+	   the mid-low bands. By default it's enabled but can be disabled for
+	   debugging by setting the option to "disable".
+
+       aac_ltp
+	   Enables the use of the long term prediction extension which
+	   increases coding efficiency in very low bandwidth situations such
+	   as encoding of voice or solo piano music by extending constant
+	   harmonic peaks in bands throughout frames. This option is implied
+	   by profile:a aac_low and is incompatible with aac_pred. Use in
+	   conjunction with -ar to decrease the samplerate.
+
+       aac_pred
+	   Enables the use of a more traditional style of prediction where the
+	   spectral coefficients transmitted are replaced by the difference of
+	   the current coefficients minus the previous "predicted"
+	   coefficients. In theory and sometimes in practice this can improve
+	   quality for low to mid bitrate audio.  This option implies the
+	   aac_main profile and is incompatible with aac_ltp.
+
+       profile
+	   Sets the encoding profile, possible values:
+
+	   aac_low
+	       The default, AAC "Low-complexity" profile. Is the most
+	       compatible and produces decent quality.
+
+	   mpeg2_aac_low
+	       Equivalent to "-profile:a aac_low -aac_pns 0". PNS was
+	       introduced with the MPEG4 specifications.
+
+	   aac_ltp
+	       Long term prediction profile, is enabled by and will enable the
+	       aac_ltp option. Introduced in MPEG4.
+
+	   aac_main
+	       Main-type prediction profile, is enabled by and will enable the
+	       aac_pred option. Introduced in MPEG2.
+
+	   If this option is unspecified it is set to aac_low.
+
+   ac3 and ac3_fixed
+       AC-3 audio encoders.
+
+       These encoders implement part of ATSC A/52:2010 and ETSI TS 102 366, as
+       well as the undocumented RealAudio 3 (a.k.a. dnet).
+
+       The ac3 encoder uses floating-point math, while the ac3_fixed encoder
+       only uses fixed-point integer math. This does not mean that one is
+       always faster, just that one or the other may be better suited to a
+       particular system. The ac3_fixed encoder is not the default codec for
+       any of the output formats, so it must be specified explicitly using the
+       option "-acodec ac3_fixed" in order to use it.
+
+       AC-3 Metadata
+
+       The AC-3 metadata options are used to set parameters that describe the
+       audio, but in most cases do not affect the audio encoding itself. Some
+       of the options do directly affect or influence the decoding and
+       playback of the resulting bitstream, while others are just for
+       informational purposes. A few of the options will add bits to the
+       output stream that could otherwise be used for audio data, and will
+       thus affect the quality of the output. Those will be indicated
+       accordingly with a note in the option list below.
+
+       These parameters are described in detail in several publicly-available
+       documents.
+
+       *<<http://www.atsc.org/cms/standards/a_52-2010.pdf>>
+       *<<http://www.atsc.org/cms/standards/a_54a_with_corr_1.pdf>>
+       *<<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/18_Metadata.Guide.pdf>>
+       *<<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf>>
+
+       Metadata Control Options
+
+       -per_frame_metadata boolean
+	   Allow Per-Frame Metadata. Specifies if the encoder should check for
+	   changing metadata for each frame.
+
+	   0   The metadata values set at initialization will be used for
+	       every frame in the stream. (default)
+
+	   1   Metadata values can be changed before encoding each frame.
+
+       Downmix Levels
+
+       -center_mixlev level
+	   Center Mix Level. The amount of gain the decoder should apply to
+	   the center channel when downmixing to stereo. This field will only
+	   be written to the bitstream if a center channel is present. The
+	   value is specified as a scale factor. There are 3 valid values:
+
+	   0.707
+	       Apply -3dB gain
+
+	   0.595
+	       Apply -4.5dB gain (default)
+
+	   0.500
+	       Apply -6dB gain
+
+       -surround_mixlev level
+	   Surround Mix Level. The amount of gain the decoder should apply to
+	   the surround channel(s) when downmixing to stereo. This field will
+	   only be written to the bitstream if one or more surround channels
+	   are present. The value is specified as a scale factor.  There are 3
+	   valid values:
+
+	   0.707
+	       Apply -3dB gain
+
+	   0.500
+	       Apply -6dB gain (default)
+
+	   0.000
+	       Silence Surround Channel(s)
+
+       Audio Production Information
+
+       Audio Production Information is optional information describing the
+       mixing environment.  Either none or both of the fields are written to
+       the bitstream.
+
+       -mixing_level number
+	   Mixing Level. Specifies peak sound pressure level (SPL) in the
+	   production environment when the mix was mastered. Valid values are
+	   80 to 111, or -1 for unknown or not indicated. The default value is
+	   -1, but that value cannot be used if the Audio Production
+	   Information is written to the bitstream. Therefore, if the
+	   "room_type" option is not the default value, the "mixing_level"
+	   option must not be -1.
+
+       -room_type type
+	   Room Type. Describes the equalization used during the final mixing
+	   session at the studio or on the dubbing stage. A large room is a
+	   dubbing stage with the industry standard X-curve equalization; a
+	   small room has flat equalization.  This field will not be written
+	   to the bitstream if both the "mixing_level" option and the
+	   "room_type" option have the default values.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   large
+	       Large Room
+
+	   2
+	   small
+	       Small Room
+
+       Other Metadata Options
+
+       -copyright boolean
+	   Copyright Indicator. Specifies whether a copyright exists for this
+	   audio.
+
+	   0
+	   off No Copyright Exists (default)
+
+	   1
+	   on  Copyright Exists
+
+       -dialnorm value
+	   Dialogue Normalization. Indicates how far the average dialogue
+	   level of the program is below digital 100% full scale (0 dBFS).
+	   This parameter determines a level shift during audio reproduction
+	   that sets the average volume of the dialogue to a preset level. The
+	   goal is to match volume level between program sources. A value of
+	   -31dB will result in no volume level change, relative to the source
+	   volume, during audio reproduction. Valid values are whole numbers
+	   in the range -31 to -1, with -31 being the default.
+
+       -dsur_mode mode
+	   Dolby Surround Mode. Specifies whether the stereo signal uses Dolby
+	   Surround (Pro Logic). This field will only be written to the
+	   bitstream if the audio stream is stereo. Using this option does NOT
+	   mean the encoder will actually apply Dolby Surround processing.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   off Not Dolby Surround Encoded
+
+	   2
+	   on  Dolby Surround Encoded
+
+       -original boolean
+	   Original Bit Stream Indicator. Specifies whether this audio is from
+	   the original source and not a copy.
+
+	   0
+	   off Not Original Source
+
+	   1
+	   on  Original Source (default)
+
+       Extended Bitstream Information
+
+       The extended bitstream options are part of the Alternate Bit Stream
+       Syntax as specified in Annex D of the A/52:2010 standard. It is grouped
+       into 2 parts.  If any one parameter in a group is specified, all values
+       in that group will be written to the bitstream.	Default values are
+       used for those that are written but have not been specified.  If the
+       mixing levels are written, the decoder will use these values instead of
+       the ones specified in the "center_mixlev" and "surround_mixlev" options
+       if it supports the Alternate Bit Stream Syntax.
+
+       Extended Bitstream Information - Part 1
+
+       -dmix_mode mode
+	   Preferred Stereo Downmix Mode. Allows the user to select either
+	   Lt/Rt (Dolby Surround) or Lo/Ro (normal stereo) as the preferred
+	   stereo downmix mode.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   ltrt
+	       Lt/Rt Downmix Preferred
+
+	   2
+	   loro
+	       Lo/Ro Downmix Preferred
+
+       -ltrt_cmixlev level
+	   Lt/Rt Center Mix Level. The amount of gain the decoder should apply
+	   to the center channel when downmixing to stereo in Lt/Rt mode.
+
+	   1.414
+	       Apply +3dB gain
+
+	   1.189
+	       Apply +1.5dB gain
+
+	   1.000
+	       Apply 0dB gain
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain (default)
+
+	   0.500
+	       Apply -6.0dB gain
+
+	   0.000
+	       Silence Center Channel
+
+       -ltrt_surmixlev level
+	   Lt/Rt Surround Mix Level. The amount of gain the decoder should
+	   apply to the surround channel(s) when downmixing to stereo in Lt/Rt
+	   mode.
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain
+
+	   0.500
+	       Apply -6.0dB gain (default)
+
+	   0.000
+	       Silence Surround Channel(s)
+
+       -loro_cmixlev level
+	   Lo/Ro Center Mix Level. The amount of gain the decoder should apply
+	   to the center channel when downmixing to stereo in Lo/Ro mode.
+
+	   1.414
+	       Apply +3dB gain
+
+	   1.189
+	       Apply +1.5dB gain
+
+	   1.000
+	       Apply 0dB gain
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain (default)
+
+	   0.500
+	       Apply -6.0dB gain
+
+	   0.000
+	       Silence Center Channel
+
+       -loro_surmixlev level
+	   Lo/Ro Surround Mix Level. The amount of gain the decoder should
+	   apply to the surround channel(s) when downmixing to stereo in Lo/Ro
+	   mode.
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain
+
+	   0.500
+	       Apply -6.0dB gain (default)
+
+	   0.000
+	       Silence Surround Channel(s)
+
+       Extended Bitstream Information - Part 2
+
+       -dsurex_mode mode
+	   Dolby Surround EX Mode. Indicates whether the stream uses Dolby
+	   Surround EX (7.1 matrixed to 5.1). Using this option does NOT mean
+	   the encoder will actually apply Dolby Surround EX processing.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   on  Dolby Surround EX Off
+
+	   2
+	   off Dolby Surround EX On
+
+       -dheadphone_mode mode
+	   Dolby Headphone Mode. Indicates whether the stream uses Dolby
+	   Headphone encoding (multi-channel matrixed to 2.0 for use with
+	   headphones). Using this option does NOT mean the encoder will
+	   actually apply Dolby Headphone processing.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   on  Dolby Headphone Off
+
+	   2
+	   off Dolby Headphone On
+
+       -ad_conv_type type
+	   A/D Converter Type. Indicates whether the audio has passed through
+	   HDCD A/D conversion.
+
+	   0
+	   standard
+	       Standard A/D Converter (default)
+
+	   1
+	   hdcd
+	       HDCD A/D Converter
+
+       Other AC-3 Encoding Options
+
+       -stereo_rematrixing boolean
+	   Stereo Rematrixing. Enables/Disables use of rematrixing for stereo
+	   input. This is an optional AC-3 feature that increases quality by
+	   selectively encoding the left/right channels as mid/side. This
+	   option is enabled by default, and it is highly recommended that it
+	   be left as enabled except for testing purposes.
+
+       cutoff frequency
+	   Set lowpass cutoff frequency. If unspecified, the encoder selects a
+	   default determined by various other encoding parameters.
+
+       Floating-Point-Only AC-3 Encoding Options
+
+       These options are only valid for the floating-point encoder and do not
+       exist for the fixed-point encoder due to the corresponding features not
+       being implemented in fixed-point.
+
+       -channel_coupling boolean
+	   Enables/Disables use of channel coupling, which is an optional AC-3
+	   feature that increases quality by combining high frequency
+	   information from multiple channels into a single channel. The per-
+	   channel high frequency information is sent with less accuracy in
+	   both the frequency and time domains. This allows more bits to be
+	   used for lower frequencies while preserving enough information to
+	   reconstruct the high frequencies. This option is enabled by default
+	   for the floating-point encoder and should generally be left as
+	   enabled except for testing purposes or to increase encoding speed.
+
+	   -1
+	   auto
+	       Selected by Encoder (default)
+
+	   0
+	   off Disable Channel Coupling
+
+	   1
+	   on  Enable Channel Coupling
+
+       -cpl_start_band number
+	   Coupling Start Band. Sets the channel coupling start band, from 1
+	   to 15. If a value higher than the bandwidth is used, it will be
+	   reduced to 1 less than the coupling end band. If auto is used, the
+	   start band will be determined by the encoder based on the bit rate,
+	   sample rate, and channel layout. This option has no effect if
+	   channel coupling is disabled.
+
+	   -1
+	   auto
+	       Selected by Encoder (default)
+
+   flac
+       FLAC (Free Lossless Audio Codec) Encoder
+
+       Options
+
+       The following options are supported by FFmpeg's flac encoder.
+
+       compression_level
+	   Sets the compression level, which chooses defaults for many other
+	   options if they are not set explicitly. Valid values are from 0 to
+	   12, 5 is the default.
+
+       frame_size
+	   Sets the size of the frames in samples per channel.
+
+       lpc_coeff_precision
+	   Sets the LPC coefficient precision, valid values are from 1 to 15,
+	   15 is the default.
+
+       lpc_type
+	   Sets the first stage LPC algorithm
+
+	   none
+	       LPC is not used
+
+	   fixed
+	       fixed LPC coefficients
+
+	   levinson
+	   cholesky
+       lpc_passes
+	   Number of passes to use for Cholesky factorization during LPC
+	   analysis
+
+       min_partition_order
+	   The minimum partition order
+
+       max_partition_order
+	   The maximum partition order
+
+       prediction_order_method
+	   estimation
+	   2level
+	   4level
+	   8level
+	   search
+	       Bruteforce search
+
+	   log
+       ch_mode
+	   Channel mode
+
+	   auto
+	       The mode is chosen automatically for each frame
+
+	   indep
+	       Channels are independently coded
+
+	   left_side
+	   right_side
+	   mid_side
+       exact_rice_parameters
+	   Chooses if rice parameters are calculated exactly or approximately.
+	   if set to 1 then they are chosen exactly, which slows the code down
+	   slightly and improves compression slightly.
+
+       multi_dim_quant
+	   Multi Dimensional Quantization. If set to 1 then a 2nd stage LPC
+	   algorithm is applied after the first stage to finetune the
+	   coefficients. This is quite slow and slightly improves compression.
+
+   opus
+       Opus encoder.
+
+       This is a native FFmpeg encoder for the Opus format. Currently, it's in
+       development and only implements the CELT part of the codec. Its quality
+       is usually worse and at best is equal to the libopus encoder.
+
+       Options
+
+       b   Set bit rate in bits/s. If unspecified it uses the number of
+	   channels and the layout to make a good guess.
+
+       opus_delay
+	   Sets the maximum delay in milliseconds. Lower delays than 20ms will
+	   very quickly decrease quality.
+
+   libfdk_aac
+       libfdk-aac AAC (Advanced Audio Coding) encoder wrapper.
+
+       The libfdk-aac library is based on the Fraunhofer FDK AAC code from the
+       Android project.
+
+       Requires the presence of the libfdk-aac headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libfdk-aac". The library is also incompatible with GPL, so if
+       you allow the use of GPL, you should configure with "--enable-gpl
+       --enable-nonfree --enable-libfdk-aac".
+
+       This encoder has support for the AAC-HE profiles.
+
+       VBR encoding, enabled through the vbr or flags +qscale options, is
+       experimental and only works with some combinations of parameters.
+
+       Support for encoding 7.1 audio is only available with libfdk-aac 0.1.3
+       or higher.
+
+       For more information see the fdk-aac project at
+       <http://sourceforge.net/p/opencore-amr/fdk-aac/>.
+
+       Options
+
+       The following options are mapped on the shared FFmpeg codec options.
+
+       b   Set bit rate in bits/s. If the bitrate is not explicitly specified,
+	   it is automatically set to a suitable value depending on the
+	   selected profile.
+
+	   In case VBR mode is enabled the option is ignored.
+
+       ar  Set audio sampling rate (in Hz).
+
+       channels
+	   Set the number of audio channels.
+
+       flags +qscale
+	   Enable fixed quality, VBR (Variable Bit Rate) mode.	Note that VBR
+	   is implicitly enabled when the vbr value is positive.
+
+       cutoff
+	   Set cutoff frequency. If not specified (or explicitly set to 0) it
+	   will use a value automatically computed by the library. Default
+	   value is 0.
+
+       profile
+	   Set audio profile.
+
+	   The following profiles are recognized:
+
+	   aac_low
+	       Low Complexity AAC (LC)
+
+	   aac_he
+	       High Efficiency AAC (HE-AAC)
+
+	   aac_he_v2
+	       High Efficiency AAC version 2 (HE-AACv2)
+
+	   aac_ld
+	       Low Delay AAC (LD)
+
+	   aac_eld
+	       Enhanced Low Delay AAC (ELD)
+
+	   If not specified it is set to aac_low.
+
+       The following are private options of the libfdk_aac encoder.
+
+       afterburner
+	   Enable afterburner feature if set to 1, disabled if set to 0. This
+	   improves the quality but also the required processing power.
+
+	   Default value is 1.
+
+       eld_sbr
+	   Enable SBR (Spectral Band Replication) for ELD if set to 1,
+	   disabled if set to 0.
+
+	   Default value is 0.
+
+       eld_v2
+	   Enable ELDv2 (LD-MPS extension for ELD stereo signals) for ELDv2 if
+	   set to 1, disabled if set to 0.
+
+	   Note that option is available when fdk-aac version
+	   (AACENCODER_LIB_VL0.AACENCODER_LIB_VL1.AACENCODER_LIB_VL2) >
+	   (4.0.0).
+
+	   Default value is 0.
+
+       signaling
+	   Set SBR/PS signaling style.
+
+	   It can assume one of the following values:
+
+	   default
+	       choose signaling implicitly (explicit hierarchical by default,
+	       implicit if global header is disabled)
+
+	   implicit
+	       implicit backwards compatible signaling
+
+	   explicit_sbr
+	       explicit SBR, implicit PS signaling
+
+	   explicit_hierarchical
+	       explicit hierarchical signaling
+
+	   Default value is default.
+
+       latm
+	   Output LATM/LOAS encapsulated data if set to 1, disabled if set to
+	   0.
+
+	   Default value is 0.
+
+       header_period
+	   Set StreamMuxConfig and PCE repetition period (in frames) for
+	   sending in-band configuration buffers within LATM/LOAS transport
+	   layer.
+
+	   Must be a 16-bits non-negative integer.
+
+	   Default value is 0.
+
+       vbr Set VBR mode, from 1 to 5. 1 is lowest quality (though still pretty
+	   good) and 5 is highest quality. A value of 0 will disable VBR, and
+	   CBR (Constant Bit Rate) is enabled.
+
+	   Currently only the aac_low profile supports VBR encoding.
+
+	   VBR modes 1-5 correspond to roughly the following average bit
+	   rates:
+
+	   1   32 kbps/channel
+
+	   2   40 kbps/channel
+
+	   3   48-56 kbps/channel
+
+	   4   64 kbps/channel
+
+	   5   about 80-96 kbps/channel
+
+	   Default value is 0.
+
+       frame_length
+	   Set the audio frame length in samples. Default value is the
+	   internal default of the library. Refer to the library's
+	   documentation for information about supported values.
+
+       Examples
+
+       o   Use ffmpeg to convert an audio file to VBR AAC in an M4A (MP4)
+	   container:
+
+		   ffmpeg -i input.wav -codec:a libfdk_aac -vbr 3 output.m4a
+
+       o   Use ffmpeg to convert an audio file to CBR 64k kbps AAC, using the
+	   High-Efficiency AAC profile:
+
+		   ffmpeg -i input.wav -c:a libfdk_aac -profile:a aac_he -b:a 64k output.m4a
+
+   libmp3lame
+       LAME (Lame Ain't an MP3 Encoder) MP3 encoder wrapper.
+
+       Requires the presence of the libmp3lame headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libmp3lame".
+
+       See libshine for a fixed-point MP3 encoder, although with a lower
+       quality.
+
+       Options
+
+       The following options are supported by the libmp3lame wrapper. The
+       lame-equivalent of the options are listed in parentheses.
+
+       b (-b)
+	   Set bitrate expressed in bits/s for CBR or ABR. LAME "bitrate" is
+	   expressed in kilobits/s.
+
+       q (-V)
+	   Set constant quality setting for VBR. This option is valid only
+	   using the ffmpeg command-line tool. For library interface users,
+	   use global_quality.
+
+       compression_level (-q)
+	   Set algorithm quality. Valid arguments are integers in the 0-9
+	   range, with 0 meaning highest quality but slowest, and 9 meaning
+	   fastest while producing the worst quality.
+
+       cutoff (--lowpass)
+	   Set lowpass cutoff frequency. If unspecified, the encoder
+	   dynamically adjusts the cutoff.
+
+       reservoir
+	   Enable use of bit reservoir when set to 1. Default value is 1. LAME
+	   has this enabled by default, but can be overridden by use --nores
+	   option.
+
+       joint_stereo (-m j)
+	   Enable the encoder to use (on a frame by frame basis) either L/R
+	   stereo or mid/side stereo. Default value is 1.
+
+       abr (--abr)
+	   Enable the encoder to use ABR when set to 1. The lame --abr sets
+	   the target bitrate, while this options only tells FFmpeg to use ABR
+	   still relies on b to set bitrate.
+
+       copyright (-c)
+	   Set MPEG audio copyright flag when set to 1. The default value is 0
+	   (disabled).
+
+       original (-o)
+	   Set MPEG audio original flag when set to 1. The default value is 1
+	   (enabled).
+
+   libopencore-amrnb
+       OpenCORE Adaptive Multi-Rate Narrowband encoder.
+
+       Requires the presence of the libopencore-amrnb headers and library
+       during configuration. You need to explicitly configure the build with
+       "--enable-libopencore-amrnb --enable-version3".
+
+       This is a mono-only encoder. Officially it only supports 8000Hz sample
+       rate, but you can override it by setting strict to unofficial or lower.
+
+       Options
+
+       b   Set bitrate in bits per second. Only the following bitrates are
+	   supported, otherwise libavcodec will round to the nearest valid
+	   bitrate.
+
+	   4750
+	   5150
+	   5900
+	   6700
+	   7400
+	   7950
+	   10200
+	   12200
+       dtx Allow discontinuous transmission (generate comfort noise) when set
+	   to 1. The default value is 0 (disabled).
+
+   libopus
+       libopus Opus Interactive Audio Codec encoder wrapper.
+
+       Requires the presence of the libopus headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libopus".
+
+       Option Mapping
+
+       Most libopus options are modelled after the opusenc utility from opus-
+       tools. The following is an option mapping chart describing options
+       supported by the libopus wrapper, and their opusenc-equivalent in
+       parentheses.
+
+       b (bitrate)
+	   Set the bit rate in bits/s.	FFmpeg's b option is expressed in
+	   bits/s, while opusenc's bitrate in kilobits/s.
+
+       vbr (vbr, hard-cbr, and cvbr)
+	   Set VBR mode. The FFmpeg vbr option has the following valid
+	   arguments, with the opusenc equivalent options in parentheses:
+
+	   off (hard-cbr)
+	       Use constant bit rate encoding.
+
+	   on (vbr)
+	       Use variable bit rate encoding (the default).
+
+	   constrained (cvbr)
+	       Use constrained variable bit rate encoding.
+
+       compression_level (comp)
+	   Set encoding algorithm complexity. Valid options are integers in
+	   the 0-10 range. 0 gives the fastest encodes but lower quality,
+	   while 10 gives the highest quality but slowest encoding. The
+	   default is 10.
+
+       frame_duration (framesize)
+	   Set maximum frame size, or duration of a frame in milliseconds. The
+	   argument must be exactly the following: 2.5, 5, 10, 20, 40, 60.
+	   Smaller frame sizes achieve lower latency but less quality at a
+	   given bitrate.  Sizes greater than 20ms are only interesting at
+	   fairly low bitrates.  The default is 20ms.
+
+       packet_loss (expect-loss)
+	   Set expected packet loss percentage. The default is 0.
+
+       fec (n/a)
+	   Enable inband forward error correction. packet_loss must be non-
+	   zero to take advantage - frequency of FEC 'side-data' is
+	   proportional to expected packet loss.  Default is disabled.
+
+       application (N.A.)
+	   Set intended application type. Valid options are listed below:
+
+	   voip
+	       Favor improved speech intelligibility.
+
+	   audio
+	       Favor faithfulness to the input (the default).
+
+	   lowdelay
+	       Restrict to only the lowest delay modes by disabling voice-
+	       optimized modes.
+
+       cutoff (N.A.)
+	   Set cutoff bandwidth in Hz. The argument must be exactly one of the
+	   following: 4000, 6000, 8000, 12000, or 20000, corresponding to
+	   narrowband, mediumband, wideband, super wideband, and fullband
+	   respectively. The default is 0 (cutoff disabled). Note that libopus
+	   forces a wideband cutoff for bitrates < 15 kbps, unless CELT-only
+	   (application set to lowdelay) mode is used.
+
+       mapping_family (mapping_family)
+	   Set channel mapping family to be used by the encoder. The default
+	   value of -1 uses mapping family 0 for mono and stereo inputs, and
+	   mapping family 1 otherwise. The default also disables the surround
+	   masking and LFE bandwidth optimzations in libopus, and requires
+	   that the input contains 8 channels or fewer.
+
+	   Other values include 0 for mono and stereo, 1 for surround sound
+	   with masking and LFE bandwidth optimizations, and 255 for
+	   independent streams with an unspecified channel layout.
+
+       apply_phase_inv (N.A.) (requires libopus >= 1.2)
+	   If set to 0, disables the use of phase inversion for intensity
+	   stereo, improving the quality of mono downmixes, but slightly
+	   reducing normal stereo quality. The default is 1 (phase inversion
+	   enabled).
+
+   libshine
+       Shine Fixed-Point MP3 encoder wrapper.
+
+       Shine is a fixed-point MP3 encoder. It has a far better performance on
+       platforms without an FPU, e.g. armel CPUs, and some phones and tablets.
+       However, as it is more targeted on performance than quality, it is not
+       on par with LAME and other production-grade encoders quality-wise.
+       Also, according to the project's homepage, this encoder may not be free
+       of bugs as the code was written a long time ago and the project was
+       dead for at least 5 years.
+
+       This encoder only supports stereo and mono input. This is also CBR-
+       only.
+
+       The original project (last updated in early 2007) is at
+       <http://sourceforge.net/projects/libshine-fxp/>. We only support the
+       updated fork by the Savonet/Liquidsoap project at
+       <https://github.com/savonet/shine>.
+
+       Requires the presence of the libshine headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libshine".
+
+       See also libmp3lame.
+
+       Options
+
+       The following options are supported by the libshine wrapper. The
+       shineenc-equivalent of the options are listed in parentheses.
+
+       b (-b)
+	   Set bitrate expressed in bits/s for CBR. shineenc -b option is
+	   expressed in kilobits/s.
+
+   libtwolame
+       TwoLAME MP2 encoder wrapper.
+
+       Requires the presence of the libtwolame headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libtwolame".
+
+       Options
+
+       The following options are supported by the libtwolame wrapper. The
+       twolame-equivalent options follow the FFmpeg ones and are in
+       parentheses.
+
+       b (-b)
+	   Set bitrate expressed in bits/s for CBR. twolame b option is
+	   expressed in kilobits/s. Default value is 128k.
+
+       q (-V)
+	   Set quality for experimental VBR support. Maximum value range is
+	   from -50 to 50, useful range is from -10 to 10. The higher the
+	   value, the better the quality. This option is valid only using the
+	   ffmpeg command-line tool. For library interface users, use
+	   global_quality.
+
+       mode (--mode)
+	   Set the mode of the resulting audio. Possible values:
+
+	   auto
+	       Choose mode automatically based on the input. This is the
+	       default.
+
+	   stereo
+	       Stereo
+
+	   joint_stereo
+	       Joint stereo
+
+	   dual_channel
+	       Dual channel
+
+	   mono
+	       Mono
+
+       psymodel (--psyc-mode)
+	   Set psychoacoustic model to use in encoding. The argument must be
+	   an integer between -1 and 4, inclusive. The higher the value, the
+	   better the quality. The default value is 3.
+
+       energy_levels (--energy)
+	   Enable energy levels extensions when set to 1. The default value is
+	   0 (disabled).
+
+       error_protection (--protect)
+	   Enable CRC error protection when set to 1. The default value is 0
+	   (disabled).
+
+       copyright (--copyright)
+	   Set MPEG audio copyright flag when set to 1. The default value is 0
+	   (disabled).
+
+       original (--original)
+	   Set MPEG audio original flag when set to 1. The default value is 0
+	   (disabled).
+
+   libvo-amrwbenc
+       VisualOn Adaptive Multi-Rate Wideband encoder.
+
+       Requires the presence of the libvo-amrwbenc headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libvo-amrwbenc --enable-version3".
+
+       This is a mono-only encoder. Officially it only supports 16000Hz sample
+       rate, but you can override it by setting strict to unofficial or lower.
+
+       Options
+
+       b   Set bitrate in bits/s. Only the following bitrates are supported,
+	   otherwise libavcodec will round to the nearest valid bitrate.
+
+	   6600
+	   8850
+	   12650
+	   14250
+	   15850
+	   18250
+	   19850
+	   23050
+	   23850
+       dtx Allow discontinuous transmission (generate comfort noise) when set
+	   to 1. The default value is 0 (disabled).
+
+   libvorbis
+       libvorbis encoder wrapper.
+
+       Requires the presence of the libvorbisenc headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libvorbis".
+
+       Options
+
+       The following options are supported by the libvorbis wrapper. The
+       oggenc-equivalent of the options are listed in parentheses.
+
+       To get a more accurate and extensive documentation of the libvorbis
+       options, consult the libvorbisenc's and oggenc's documentations.  See
+       <http://xiph.org/vorbis/>, <http://wiki.xiph.org/Vorbis-tools>, and
+       oggenc(1).
+
+       b (-b)
+	   Set bitrate expressed in bits/s for ABR. oggenc -b is expressed in
+	   kilobits/s.
+
+       q (-q)
+	   Set constant quality setting for VBR. The value should be a float
+	   number in the range of -1.0 to 10.0. The higher the value, the
+	   better the quality. The default value is 3.0.
+
+	   This option is valid only using the ffmpeg command-line tool.  For
+	   library interface users, use global_quality.
+
+       cutoff (--advanced-encode-option lowpass_frequency=N)
+	   Set cutoff bandwidth in Hz, a value of 0 disables cutoff. oggenc's
+	   related option is expressed in kHz. The default value is 0 (cutoff
+	   disabled).
+
+       minrate (-m)
+	   Set minimum bitrate expressed in bits/s. oggenc -m is expressed in
+	   kilobits/s.
+
+       maxrate (-M)
+	   Set maximum bitrate expressed in bits/s. oggenc -M is expressed in
+	   kilobits/s. This only has effect on ABR mode.
+
+       iblock (--advanced-encode-option impulse_noisetune=N)
+	   Set noise floor bias for impulse blocks. The value is a float
+	   number from -15.0 to 0.0. A negative bias instructs the encoder to
+	   pay special attention to the crispness of transients in the encoded
+	   audio. The tradeoff for better transient response is a higher
+	   bitrate.
+
+   mjpeg
+       Motion JPEG encoder.
+
+       Options
+
+       huffman
+	   Set the huffman encoding strategy. Possible values:
+
+	   default
+	       Use the default huffman tables. This is the default strategy.
+
+	   optimal
+	       Compute and use optimal huffman tables.
+
+   wavpack
+       WavPack lossless audio encoder.
+
+       Options
+
+       The equivalent options for wavpack command line utility are listed in
+       parentheses.
+
+       Shared options
+
+       The following shared options are effective for this encoder. Only
+       special notes about this particular encoder will be documented here.
+       For the general meaning of the options, see the Codec Options chapter.
+
+       frame_size (--blocksize)
+	   For this encoder, the range for this option is between 128 and
+	   131072. Default is automatically decided based on sample rate and
+	   number of channel.
+
+	   For the complete formula of calculating default, see
+	   libavcodec/wavpackenc.c.
+
+       compression_level (-f, -h, -hh, and -x)
+
+       Private options
+
+       joint_stereo (-j)
+	   Set whether to enable joint stereo. Valid values are:
+
+	   on (1)
+	       Force mid/side audio encoding.
+
+	   off (0)
+	       Force left/right audio encoding.
+
+	   auto
+	       Let the encoder decide automatically.
+
+       optimize_mono
+	   Set whether to enable optimization for mono. This option is only
+	   effective for non-mono streams. Available values:
+
+	   on  enabled
+
+	   off disabled
+
+VIDEO ENCODERS
+       A description of some of the currently available video encoders
+       follows.
+
+   a64_multi, a64_multi5
+       A64 / Commodore 64 multicolor charset encoder. "a64_multi5" is extended
+       with 5th color (colram).
+
+   Cinepak
+       Cinepak aka CVID encoder.  Compatible with Windows 3.1 and vintage
+       MacOS.
+
+       Options
+
+       g integer
+	   Keyframe interval.  A keyframe is inserted at least every "-g"
+	   frames, sometimes sooner.
+
+       q:v integer
+	   Quality factor. Lower is better. Higher gives lower bitrate.  The
+	   following table lists bitrates when encoding akiyo_cif.y4m for
+	   various values of "-q:v" with "-g 100":
+
+	   "-q:v 1" 1918 kb/s
+	   "-q:v 2" 1735 kb/s
+	   "-q:v 4" 1500 kb/s
+	   "-q:v 10" 1041 kb/s
+	   "-q:v 20" 826 kb/s
+	   "-q:v 40" 553 kb/s
+	   "-q:v 100" 394 kb/s
+	   "-q:v 200" 312 kb/s
+	   "-q:v 400" 266 kb/s
+	   "-q:v 1000" 237 kb/s
+       max_extra_cb_iterations integer
+	   Max extra codebook recalculation passes, more is better and slower.
+
+       skip_empty_cb boolean
+	   Avoid wasting bytes, ignore vintage MacOS decoder.
+
+       max_strips integer
+       min_strips integer
+	   The minimum and maximum number of strips to use.  Wider range
+	   sometimes improves quality.	More strips is generally better
+	   quality but costs more bits.  Fewer strips tend to yield more
+	   keyframes.  Vintage compatible is 1..3.
+
+       strip_number_adaptivity integer
+	   How much number of strips is allowed to change between frames.
+	   Higher is better but slower.
+
+   GIF
+       GIF image/animation encoder.
+
+       Options
+
+       gifflags integer
+	   Sets the flags used for GIF encoding.
+
+	   offsetting
+	       Enables picture offsetting.
+
+	       Default is enabled.
+
+	   transdiff
+	       Enables transparency detection between frames.
+
+	       Default is enabled.
+
+       gifimage integer
+	   Enables encoding one full GIF image per frame, rather than an
+	   animated GIF.
+
+	   Default value is 0.
+
+       global_palette integer
+	   Writes a palette to the global GIF header where feasible.
+
+	   If disabled, every frame will always have a palette written, even
+	   if there is a global palette supplied.
+
+	   Default value is 1.
+
+   Hap
+       Vidvox Hap video encoder.
+
+       Options
+
+       format integer
+	   Specifies the Hap format to encode.
+
+	   hap
+	   hap_alpha
+	   hap_q
+
+	   Default value is hap.
+
+       chunks integer
+	   Specifies the number of chunks to split frames into, between 1 and
+	   64. This permits multithreaded decoding of large frames,
+	   potentially at the cost of data-rate. The encoder may modify this
+	   value to divide frames evenly.
+
+	   Default value is 1.
+
+       compressor integer
+	   Specifies the second-stage compressor to use. If set to none,
+	   chunks will be limited to 1, as chunked uncompressed frames offer
+	   no benefit.
+
+	   none
+	   snappy
+
+	   Default value is snappy.
+
+   jpeg2000
+       The native jpeg 2000 encoder is lossy by default, the "-q:v" option can
+       be used to set the encoding quality. Lossless encoding can be selected
+       with "-pred 1".
+
+       Options
+
+       format integer
+	   Can be set to either "j2k" or "jp2" (the default) that makes it
+	   possible to store non-rgb pix_fmts.
+
+       tile_width integer
+	   Sets tile width. Range is 1 to 1073741824. Default is 256.
+
+       tile_height integer
+	   Sets tile height. Range is 1 to 1073741824. Default is 256.
+
+       pred integer
+	   Allows setting the discrete wavelet transform (DWT) type
+
+	   dwt97int (Lossy)
+	   dwt53 (Lossless)
+
+	   Default is "dwt97int"
+
+       sop boolean
+	   Enable this to add SOP marker at the start of each packet. Disabled
+	   by default.
+
+       eph boolean
+	   Enable this to add EPH marker at the end of each packet header.
+	   Disabled by default.
+
+       prog integer
+	   Sets the progression order to be used by the encoder.  Possible
+	   values are:
+
+	   lrcp
+	   rlcp
+	   rpcl
+	   pcrl
+	   cprl
+
+	   Set to "lrcp" by default.
+
+       layer_rates string
+	   By default, when this option is not used, compression is done using
+	   the quality metric.	This option allows for compression using
+	   compression ratio. The compression ratio for each level could be
+	   specified. The compression ratio of a layer "l" species the what
+	   ratio of total file size is contained in the first "l" layers.
+
+	   Example usage:
+
+		   ffmpeg -i input.bmp -c:v jpeg2000 -layer_rates "100,10,1" output.j2k
+
+	   This would compress the image to contain 3 layers, where the data
+	   contained in the first layer would be compressed by 1000 times,
+	   compressed by 100 in the first two layers, and shall contain all
+	   data while using all 3 layers.
+
+   librav1e
+       rav1e AV1 encoder wrapper.
+
+       Requires the presence of the rav1e headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-librav1e".
+
+       Options
+
+       qmax
+	   Sets the maximum quantizer to use when using bitrate mode.
+
+       qmin
+	   Sets the minimum quantizer to use when using bitrate mode.
+
+       qp  Uses quantizer mode to encode at the given quantizer (0-255).
+
+       speed
+	   Selects the speed preset (0-10) to encode with.
+
+       tiles
+	   Selects how many tiles to encode with.
+
+       tile-rows
+	   Selects how many rows of tiles to encode with.
+
+       tile-columns
+	   Selects how many columns of tiles to encode with.
+
+       rav1e-params
+	   Set rav1e options using a list of key=value pairs separated by ":".
+	   See rav1e --help for a list of options.
+
+	   For example to specify librav1e encoding options with
+	   -rav1e-params:
+
+		   ffmpeg -i input -c:v librav1e -b:v 500K -rav1e-params speed=5:low_latency=true output.mp4
+
+   libaom-av1
+       libaom AV1 encoder wrapper.
+
+       Requires the presence of the libaom headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libaom".
+
+       Options
+
+       The wrapper supports the following standard libavcodec options:
+
+       b   Set bitrate target in bits/second.  By default this will use
+	   variable-bitrate mode.  If maxrate and minrate are also set to the
+	   same value then it will use constant-bitrate mode, otherwise if crf
+	   is set as well then it will use constrained-quality mode.
+
+       g keyint_min
+	   Set key frame placement.  The GOP size sets the maximum distance
+	   between key frames; if zero the output stream will be intra-only.
+	   The minimum distance is ignored unless it is the same as the GOP
+	   size, in which case key frames will always appear at a fixed
+	   interval.  Not set by default, so without this option the library
+	   has completely free choice about where to place key frames.
+
+       qmin qmax
+	   Set minimum/maximum quantisation values.  Valid range is from 0 to
+	   63 (warning: this does not match the quantiser values actually used
+	   by AV1 - divide by four to map real quantiser values to this
+	   range).  Defaults to min/max (no constraint).
+
+       minrate maxrate bufsize rc_init_occupancy
+	   Set rate control buffering parameters.  Not used if not set -
+	   defaults to unconstrained variable bitrate.
+
+       threads
+	   Set the number of threads to use while encoding.  This may require
+	   the tiles or row-mt options to also be set to actually use the
+	   specified number of threads fully. Defaults to the number of
+	   hardware threads supported by the host machine.
+
+       profile
+	   Set the encoding profile.  Defaults to using the profile which
+	   matches the bit depth and chroma subsampling of the input.
+
+       The wrapper also has some specific options:
+
+       cpu-used
+	   Set the quality/encoding speed tradeoff.  Valid range is from 0 to
+	   8, higher numbers indicating greater speed and lower quality.  The
+	   default value is 1, which will be slow and high quality.
+
+       auto-alt-ref
+	   Enable use of alternate reference frames.  Defaults to the internal
+	   default of the library.
+
+       arnr-max-frames (frames)
+	   Set altref noise reduction max frame count. Default is -1.
+
+       arnr-strength (strength)
+	   Set altref noise reduction filter strength. Range is -1 to 6.
+	   Default is -1.
+
+       aq-mode (aq-mode)
+	   Set adaptive quantization mode. Possible values:
+
+	   none (0)
+	       Disabled.
+
+	   variance (1)
+	       Variance-based.
+
+	   complexity (2)
+	       Complexity-based.
+
+	   cyclic (3)
+	       Cyclic refresh.
+
+       tune (tune)
+	   Set the distortion metric the encoder is tuned with. Default is
+	   "psnr".
+
+	   psnr (0)
+	   ssim (1)
+       lag-in-frames
+	   Set the maximum number of frames which the encoder may keep in
+	   flight at any one time for lookahead purposes.  Defaults to the
+	   internal default of the library.
+
+       error-resilience
+	   Enable error resilience features:
+
+	   default
+	       Improve resilience against losses of whole frames.
+
+	   Not enabled by default.
+
+       crf Set the quality/size tradeoff for constant-quality (no bitrate
+	   target) and constrained-quality (with maximum bitrate target)
+	   modes. Valid range is 0 to 63, higher numbers indicating lower
+	   quality and smaller output size.  Only used if set; by default only
+	   the bitrate target is used.
+
+       static-thresh
+	   Set a change threshold on blocks below which they will be skipped
+	   by the encoder.  Defined in arbitrary units as a nonnegative
+	   integer, defaulting to zero (no blocks are skipped).
+
+       drop-threshold
+	   Set a threshold for dropping frames when close to rate control
+	   bounds.  Defined as a percentage of the target buffer - when the
+	   rate control buffer falls below this percentage, frames will be
+	   dropped until it has refilled above the threshold.  Defaults to
+	   zero (no frames are dropped).
+
+       denoise-noise-level (level)
+	   Amount of noise to be removed for grain synthesis. Grain synthesis
+	   is disabled if this option is not set or set to 0.
+
+       denoise-block-size (pixels)
+	   Block size used for denoising for grain synthesis. If not set, AV1
+	   codec uses the default value of 32.
+
+       undershoot-pct (pct)
+	   Set datarate undershoot (min) percentage of the target bitrate.
+	   Range is -1 to 100.	Default is -1.
+
+       overshoot-pct (pct)
+	   Set datarate overshoot (max) percentage of the target bitrate.
+	   Range is -1 to 1000.  Default is -1.
+
+       minsection-pct (pct)
+	   Minimum percentage variation of the GOP bitrate from the target
+	   bitrate. If minsection-pct is not set, the libaomenc wrapper
+	   computes it as follows: "(minrate * 100 / bitrate)".  Range is -1
+	   to 100. Default is -1 (unset).
+
+       maxsection-pct (pct)
+	   Maximum percentage variation of the GOP bitrate from the target
+	   bitrate. If maxsection-pct is not set, the libaomenc wrapper
+	   computes it as follows: "(maxrate * 100 / bitrate)".  Range is -1
+	   to 5000. Default is -1 (unset).
+
+       frame-parallel (boolean)
+	   Enable frame parallel decodability features. Default is true.
+
+       tiles
+	   Set the number of tiles to encode the input video with, as columns
+	   x rows.  Larger numbers allow greater parallelism in both encoding
+	   and decoding, but may decrease coding efficiency.  Defaults to the
+	   minimum number of tiles required by the size of the input video
+	   (this is 1x1 (that is, a single tile) for sizes up to and including
+	   4K).
+
+       tile-columns tile-rows
+	   Set the number of tiles as log2 of the number of tile rows and
+	   columns.  Provided for compatibility with libvpx/VP9.
+
+       row-mt (Requires libaom >= 1.0.0-759-g90a15f4f2)
+	   Enable row based multi-threading. Disabled by default.
+
+       enable-cdef (boolean)
+	   Enable Constrained Directional Enhancement Filter. The libaom-av1
+	   encoder enables CDEF by default.
+
+       enable-restoration (boolean)
+	   Enable Loop Restoration Filter. Default is true for libaom-av1.
+
+       enable-global-motion (boolean)
+	   Enable the use of global motion for block prediction. Default is
+	   true.
+
+       enable-intrabc (boolean)
+	   Enable block copy mode for intra block prediction. This mode is
+	   useful for screen content. Default is true.
+
+       enable-rect-partitions (boolean) (Requires libaom >= v2.0.0)
+	   Enable rectangular partitions. Default is true.
+
+       enable-1to4-partitions (boolean) (Requires libaom >= v2.0.0)
+	   Enable 1:4/4:1 partitions. Default is true.
+
+       enable-ab-partitions (boolean) (Requires libaom >= v2.0.0)
+	   Enable AB shape partitions. Default is true.
+
+       enable-angle-delta (boolean) (Requires libaom >= v2.0.0)
+	   Enable angle delta intra prediction. Default is true.
+
+       enable-cfl-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable chroma predicted from luma intra prediction. Default is
+	   true.
+
+       enable-filter-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable filter intra predictor. Default is true.
+
+       enable-intra-edge-filter (boolean) (Requires libaom >= v2.0.0)
+	   Enable intra edge filter. Default is true.
+
+       enable-smooth-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable smooth intra prediction mode. Default is true.
+
+       enable-paeth-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable paeth predictor in intra prediction. Default is true.
+
+       enable-palette (boolean) (Requires libaom >= v2.0.0)
+	   Enable palette prediction mode. Default is true.
+
+       enable-flip-idtx (boolean) (Requires libaom >= v2.0.0)
+	   Enable extended transform type, including FLIPADST_DCT,
+	   DCT_FLIPADST, FLIPADST_FLIPADST, ADST_FLIPADST, FLIPADST_ADST,
+	   IDTX, V_DCT, H_DCT, V_ADST, H_ADST, V_FLIPADST, H_FLIPADST. Default
+	   is true.
+
+       enable-tx64 (boolean) (Requires libaom >= v2.0.0)
+	   Enable 64-pt transform. Default is true.
+
+       reduced-tx-type-set (boolean) (Requires libaom >= v2.0.0)
+	   Use reduced set of transform types. Default is false.
+
+       use-intra-dct-only (boolean) (Requires libaom >= v2.0.0)
+	   Use DCT only for INTRA modes. Default is false.
+
+       use-inter-dct-only (boolean) (Requires libaom >= v2.0.0)
+	   Use DCT only for INTER modes. Default is false.
+
+       use-intra-default-tx-only (boolean) (Requires libaom >= v2.0.0)
+	   Use Default-transform only for INTRA modes. Default is false.
+
+       enable-ref-frame-mvs (boolean) (Requires libaom >= v2.0.0)
+	   Enable temporal mv prediction. Default is true.
+
+       enable-reduced-reference-set (boolean) (Requires libaom >= v2.0.0)
+	   Use reduced set of single and compound references. Default is
+	   false.
+
+       enable-obmc (boolean) (Requires libaom >= v2.0.0)
+	   Enable obmc. Default is true.
+
+       enable-dual-filter (boolean) (Requires libaom >= v2.0.0)
+	   Enable dual filter. Default is true.
+
+       enable-diff-wtd-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable difference-weighted compound. Default is true.
+
+       enable-dist-wtd-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable distance-weighted compound. Default is true.
+
+       enable-onesided-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable one sided compound. Default is true.
+
+       enable-interinter-wedge (boolean) (Requires libaom >= v2.0.0)
+	   Enable interinter wedge compound. Default is true.
+
+       enable-interintra-wedge (boolean) (Requires libaom >= v2.0.0)
+	   Enable interintra wedge compound. Default is true.
+
+       enable-masked-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable masked compound. Default is true.
+
+       enable-interintra-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable interintra compound. Default is true.
+
+       enable-smooth-interintra (boolean) (Requires libaom >= v2.0.0)
+	   Enable smooth interintra mode. Default is true.
+
+       aom-params
+	   Set libaom options using a list of key=value pairs separated by
+	   ":". For a list of supported options, see aomenc --help under the
+	   section "AV1 Specific Options".
+
+	   For example to specify libaom encoding options with -aom-params:
+
+		   ffmpeg -i input -c:v libaom-av1 -b:v 500K -aom-params tune=psnr:enable-tpl-model=1 output.mp4
+
+   libsvtav1
+       SVT-AV1 encoder wrapper.
+
+       Requires the presence of the SVT-AV1 headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libsvtav1".
+
+       Options
+
+       profile
+	   Set the encoding profile.
+
+	   main
+	   high
+	   professional
+       level
+	   Set the operating point level. For example: '4.0'
+
+       hielevel
+	   Set the Hierarchical prediction levels.
+
+	   3level
+	   4level
+	       This is the default.
+
+       tier
+	   Set the operating point tier.
+
+	   main
+	       This is the default.
+
+	   high
+       qmax
+	   Set the maximum quantizer to use when using a bitrate mode.
+
+       qmin
+	   Set the minimum quantizer to use when using a bitrate mode.
+
+       crf Constant rate factor value used in crf rate control mode (0-63).
+
+       qp  Set the quantizer used in cqp rate control mode (0-63).
+
+       sc_detection
+	   Enable scene change detection.
+
+       la_depth
+	   Set number of frames to look ahead (0-120).
+
+       preset
+	   Set the quality-speed tradeoff, in the range 0 to 13.  Higher
+	   values are faster but lower quality.
+
+       tile_rows
+	   Set log2 of the number of rows of tiles to use (0-6).
+
+       tile_columns
+	   Set log2 of the number of columns of tiles to use (0-4).
+
+       svtav1-params
+	   Set SVT-AV1 options using a list of key=value pairs separated by
+	   ":". See the SVT-AV1 encoder user guide for a list of accepted
+	   parameters.
+
+   libjxl
+       libjxl JPEG XL encoder wrapper.
+
+       Requires the presence of the libjxl headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libjxl".
+
+       Options
+
+       The libjxl wrapper supports the following options:
+
+       distance
+	   Set the target Butteraugli distance. This is a quality setting:
+	   lower distance yields higher quality, with distance=1.0 roughly
+	   comparable to libjpeg Quality 90 for photographic content. Setting
+	   distance=0.0 yields true lossless encoding. Valid values range
+	   between 0.0 and 15.0, and sane values rarely exceed 5.0. Setting
+	   distance=0.1 usually attains transparency for most input. The
+	   default is 1.0.
+
+       effort
+	   Set the encoding effort used. Higher effort values produce more
+	   consistent quality and usually produces a better quality/bpp curve,
+	   at the cost of more CPU time required. Valid values range from 1 to
+	   9, and the default is 7.
+
+       modular
+	   Force the encoder to use Modular mode instead of choosing
+	   automatically. The default is to use VarDCT for lossy encoding and
+	   Modular for lossless. VarDCT is generally superior to Modular for
+	   lossy encoding but does not support lossless encoding.
+
+   libkvazaar
+       Kvazaar H.265/HEVC encoder.
+
+       Requires the presence of the libkvazaar headers and library during
+       configuration. You need to explicitly configure the build with
+       --enable-libkvazaar.
+
+       Options
+
+       b   Set target video bitrate in bit/s and enable rate control.
+
+       kvazaar-params
+	   Set kvazaar parameters as a list of name=value pairs separated by
+	   commas (,). See kvazaar documentation for a list of options.
+
+   libopenh264
+       Cisco libopenh264 H.264/MPEG-4 AVC encoder wrapper.
+
+       This encoder requires the presence of the libopenh264 headers and
+       library during configuration. You need to explicitly configure the
+       build with "--enable-libopenh264". The library is detected using pkg-
+       config.
+
+       For more information about the library see <http://www.openh264.org>.
+
+       Options
+
+       The following FFmpeg global options affect the configurations of the
+       libopenh264 encoder.
+
+       b   Set the bitrate (as a number of bits per second).
+
+       g   Set the GOP size.
+
+       maxrate
+	   Set the max bitrate (as a number of bits per second).
+
+       flags +global_header
+	   Set global header in the bitstream.
+
+       slices
+	   Set the number of slices, used in parallelized encoding. Default
+	   value is 0. This is only used when slice_mode is set to fixed.
+
+       loopfilter
+	   Enable loop filter, if set to 1 (automatically enabled). To disable
+	   set a value of 0.
+
+       profile
+	   Set profile restrictions. If set to the value of main enable CABAC
+	   (set the "SEncParamExt.iEntropyCodingModeFlag" flag to 1).
+
+       max_nal_size
+	   Set maximum NAL size in bytes.
+
+       allow_skip_frames
+	   Allow skipping frames to hit the target bitrate if set to 1.
+
+   libtheora
+       libtheora Theora encoder wrapper.
+
+       Requires the presence of the libtheora headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libtheora".
+
+       For more information about the libtheora project see
+       <http://www.theora.org/>.
+
+       Options
+
+       The following global options are mapped to internal libtheora options
+       which affect the quality and the bitrate of the encoded stream.
+
+       b   Set the video bitrate in bit/s for CBR (Constant Bit Rate) mode.
+	   In case VBR (Variable Bit Rate) mode is enabled this option is
+	   ignored.
+
+       flags
+	   Used to enable constant quality mode (VBR) encoding through the
+	   qscale flag, and to enable the "pass1" and "pass2" modes.
+
+       g   Set the GOP size.
+
+       global_quality
+	   Set the global quality as an integer in lambda units.
+
+	   Only relevant when VBR mode is enabled with "flags +qscale". The
+	   value is converted to QP units by dividing it by "FF_QP2LAMBDA",
+	   clipped in the [0 - 10] range, and then multiplied by 6.3 to get a
+	   value in the native libtheora range [0-63]. A higher value
+	   corresponds to a higher quality.
+
+       q   Enable VBR mode when set to a non-negative value, and set constant
+	   quality value as a double floating point value in QP units.
+
+	   The value is clipped in the [0-10] range, and then multiplied by
+	   6.3 to get a value in the native libtheora range [0-63].
+
+	   This option is valid only using the ffmpeg command-line tool. For
+	   library interface users, use global_quality.
+
+       Examples
+
+       o   Set maximum constant quality (VBR) encoding with ffmpeg:
+
+		   ffmpeg -i INPUT -codec:v libtheora -q:v 10 OUTPUT.ogg
+
+       o   Use ffmpeg to convert a CBR 1000 kbps Theora video stream:
+
+		   ffmpeg -i INPUT -codec:v libtheora -b:v 1000k OUTPUT.ogg
+
+   libvpx
+       VP8/VP9 format supported through libvpx.
+
+       Requires the presence of the libvpx headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libvpx".
+
+       Options
+
+       The following options are supported by the libvpx wrapper. The
+       vpxenc-equivalent options or values are listed in parentheses for easy
+       migration.
+
+       To reduce the duplication of documentation, only the private options
+       and some others requiring special attention are documented here. For
+       the documentation of the undocumented generic options, see the Codec
+       Options chapter.
+
+       To get more documentation of the libvpx options, invoke the command
+       ffmpeg -h encoder=libvpx, ffmpeg -h encoder=libvpx-vp9 or vpxenc
+       --help. Further information is available in the libvpx API
+       documentation.
+
+       b (target-bitrate)
+	   Set bitrate in bits/s. Note that FFmpeg's b option is expressed in
+	   bits/s, while vpxenc's target-bitrate is in kilobits/s.
+
+       g (kf-max-dist)
+       keyint_min (kf-min-dist)
+       qmin (min-q)
+	   Minimum (Best Quality) Quantizer.
+
+       qmax (max-q)
+	   Maximum (Worst Quality) Quantizer.  Can be changed per-frame.
+
+       bufsize (buf-sz, buf-optimal-sz)
+	   Set ratecontrol buffer size (in bits). Note vpxenc's options are
+	   specified in milliseconds, the libvpx wrapper converts this value
+	   as follows: "buf-sz = bufsize * 1000 / bitrate", "buf-optimal-sz =
+	   bufsize * 1000 / bitrate * 5 / 6".
+
+       rc_init_occupancy (buf-initial-sz)
+	   Set number of bits which should be loaded into the rc buffer before
+	   decoding starts. Note vpxenc's option is specified in milliseconds,
+	   the libvpx wrapper converts this value as follows:
+	   "rc_init_occupancy * 1000 / bitrate".
+
+       undershoot-pct
+	   Set datarate undershoot (min) percentage of the target bitrate.
+
+       overshoot-pct
+	   Set datarate overshoot (max) percentage of the target bitrate.
+
+       skip_threshold (drop-frame)
+       qcomp (bias-pct)
+       maxrate (maxsection-pct)
+	   Set GOP max bitrate in bits/s. Note vpxenc's option is specified as
+	   a percentage of the target bitrate, the libvpx wrapper converts
+	   this value as follows: "(maxrate * 100 / bitrate)".
+
+       minrate (minsection-pct)
+	   Set GOP min bitrate in bits/s. Note vpxenc's option is specified as
+	   a percentage of the target bitrate, the libvpx wrapper converts
+	   this value as follows: "(minrate * 100 / bitrate)".
+
+       minrate, maxrate, b end-usage=cbr
+	   "(minrate == maxrate == bitrate)".
+
+       crf (end-usage=cq, cq-level)
+       tune (tune)
+	   psnr (psnr)
+	   ssim (ssim)
+       quality, deadline (deadline)
+	   best
+	       Use best quality deadline. Poorly named and quite slow, this
+	       option should be avoided as it may give worse quality output
+	       than good.
+
+	   good
+	       Use good quality deadline. This is a good trade-off between
+	       speed and quality when used with the cpu-used option.
+
+	   realtime
+	       Use realtime quality deadline.
+
+       speed, cpu-used (cpu-used)
+	   Set quality/speed ratio modifier. Higher values speed up the encode
+	   at the cost of quality.
+
+       nr (noise-sensitivity)
+       static-thresh
+	   Set a change threshold on blocks below which they will be skipped
+	   by the encoder.
+
+       slices (token-parts)
+	   Note that FFmpeg's slices option gives the total number of
+	   partitions, while vpxenc's token-parts is given as
+	   "log2(partitions)".
+
+       max-intra-rate
+	   Set maximum I-frame bitrate as a percentage of the target bitrate.
+	   A value of 0 means unlimited.
+
+       force_key_frames
+	   "VPX_EFLAG_FORCE_KF"
+
+       Alternate reference frame related
+	   auto-alt-ref
+	       Enable use of alternate reference frames (2-pass only).	Values
+	       greater than 1 enable multi-layer alternate reference frames
+	       (VP9 only).
+
+	   arnr-maxframes
+	       Set altref noise reduction max frame count.
+
+	   arnr-type
+	       Set altref noise reduction filter type: backward, forward,
+	       centered.
+
+	   arnr-strength
+	       Set altref noise reduction filter strength.
+
+	   rc-lookahead, lag-in-frames (lag-in-frames)
+	       Set number of frames to look ahead for frametype and
+	       ratecontrol.
+
+	   min-gf-interval
+	       Set minimum golden/alternate reference frame interval (VP9
+	       only).
+
+       error-resilient
+	   Enable error resiliency features.
+
+       sharpness integer
+	   Increase sharpness at the expense of lower PSNR.  The valid range
+	   is [0, 7].
+
+       ts-parameters
+	   Sets the temporal scalability configuration using a :-separated
+	   list of key=value pairs. For example, to specify temporal
+	   scalability parameters with "ffmpeg":
+
+		   ffmpeg -i INPUT -c:v libvpx -ts-parameters ts_number_layers=3:\
+		   ts_target_bitrate=250,500,1000:ts_rate_decimator=4,2,1:\
+		   ts_periodicity=4:ts_layer_id=0,2,1,2:ts_layering_mode=3 OUTPUT
+
+	   Below is a brief explanation of each of the parameters, please
+	   refer to "struct vpx_codec_enc_cfg" in "vpx/vpx_encoder.h" for more
+	   details.
+
+	   ts_number_layers
+	       Number of temporal coding layers.
+
+	   ts_target_bitrate
+	       Target bitrate for each temporal layer (in kbps).  (bitrate
+	       should be inclusive of the lower temporal layer).
+
+	   ts_rate_decimator
+	       Frame rate decimation factor for each temporal layer.
+
+	   ts_periodicity
+	       Length of the sequence defining frame temporal layer
+	       membership.
+
+	   ts_layer_id
+	       Template defining the membership of frames to temporal layers.
+
+	   ts_layering_mode
+	       (optional) Selecting the temporal structure from a set of pre-
+	       defined temporal layering modes.  Currently supports the
+	       following options.
+
+	       0   No temporal layering flags are provided internally, relies
+		   on flags being passed in using "metadata" field in
+		   "AVFrame" with following keys.
+
+		   vp8-flags
+		       Sets the flags passed into the encoder to indicate the
+		       referencing scheme for the current frame.  Refer to
+		       function "vpx_codec_encode" in "vpx/vpx_encoder.h" for
+		       more details.
+
+		   temporal_id
+		       Explicitly sets the temporal id of the current frame to
+		       encode.
+
+	       2   Two temporal layers. 0-1...
+
+	       3   Three temporal layers. 0-2-1-2...; with single reference
+		   frame.
+
+	       4   Same as option "3", except there is a dependency between
+		   the two temporal layer 2 frames within the temporal period.
+
+       VP8-specific options
+	   screen-content-mode
+	       Screen content mode, one of: 0 (off), 1 (screen), 2 (screen
+	       with more aggressive rate control).
+
+       VP9-specific options
+	   lossless
+	       Enable lossless mode.
+
+	   tile-columns
+	       Set number of tile columns to use. Note this is given as
+	       "log2(tile_columns)". For example, 8 tile columns would be
+	       requested by setting the tile-columns option to 3.
+
+	   tile-rows
+	       Set number of tile rows to use. Note this is given as
+	       "log2(tile_rows)".  For example, 4 tile rows would be requested
+	       by setting the tile-rows option to 2.
+
+	   frame-parallel
+	       Enable frame parallel decodability features.
+
+	   aq-mode
+	       Set adaptive quantization mode (0: off (default), 1: variance
+	       2: complexity, 3: cyclic refresh, 4: equator360).
+
+	   colorspace color-space
+	       Set input color space. The VP9 bitstream supports signaling the
+	       following colorspaces:
+
+	       rgb sRGB
+	       bt709 bt709
+	       unspecified unknown
+	       bt470bg bt601
+	       smpte170m smpte170
+	       smpte240m smpte240
+	       bt2020_ncl bt2020
+	   row-mt boolean
+	       Enable row based multi-threading.
+
+	   tune-content
+	       Set content type: default (0), screen (1), film (2).
+
+	   corpus-complexity
+	       Corpus VBR mode is a variant of standard VBR where the
+	       complexity distribution midpoint is passed in rather than
+	       calculated for a specific clip or chunk.
+
+	       The valid range is [0, 10000]. 0 (default) uses standard VBR.
+
+	   enable-tpl boolean
+	       Enable temporal dependency model.
+
+	   ref-frame-config
+	       Using per-frame metadata, set members of the structure
+	       "vpx_svc_ref_frame_config_t" in "vpx/vp8cx.h" to fine-control
+	       referencing schemes and frame buffer management.  Use a
+	       :-separated list of key=value pairs.  For example,
+
+		       av_dict_set(&av_frame->metadata, "ref-frame-config", \
+		       "rfc_update_buffer_slot=7:rfc_lst_fb_idx=0:rfc_gld_fb_idx=1:rfc_alt_fb_idx=2:rfc_reference_last=0:rfc_reference_golden=0:rfc_reference_alt_ref=0");
+
+	       rfc_update_buffer_slot
+		   Indicates the buffer slot number to update
+
+	       rfc_update_last
+		   Indicates whether to update the LAST frame
+
+	       rfc_update_golden
+		   Indicates whether to update GOLDEN frame
+
+	       rfc_update_alt_ref
+		   Indicates whether to update ALT_REF frame
+
+	       rfc_lst_fb_idx
+		   LAST frame buffer index
+
+	       rfc_gld_fb_idx
+		   GOLDEN frame buffer index
+
+	       rfc_alt_fb_idx
+		   ALT_REF frame buffer index
+
+	       rfc_reference_last
+		   Indicates whether to reference LAST frame
+
+	       rfc_reference_golden
+		   Indicates whether to reference GOLDEN frame
+
+	       rfc_reference_alt_ref
+		   Indicates whether to reference ALT_REF frame
+
+	       rfc_reference_duration
+		   Indicates frame duration
+
+       For more information about libvpx see: <http://www.webmproject.org/>
+
+   libwebp
+       libwebp WebP Image encoder wrapper
+
+       libwebp is Google's official encoder for WebP images. It can encode in
+       either lossy or lossless mode. Lossy images are essentially a wrapper
+       around a VP8 frame. Lossless images are a separate codec developed by
+       Google.
+
+       Pixel Format
+
+       Currently, libwebp only supports YUV420 for lossy and RGB for lossless
+       due to limitations of the format and libwebp. Alpha is supported for
+       either mode.  Because of API limitations, if RGB is passed in when
+       encoding lossy or YUV is passed in for encoding lossless, the pixel
+       format will automatically be converted using functions from libwebp.
+       This is not ideal and is done only for convenience.
+
+       Options
+
+       -lossless boolean
+	   Enables/Disables use of lossless mode. Default is 0.
+
+       -compression_level integer
+	   For lossy, this is a quality/speed tradeoff. Higher values give
+	   better quality for a given size at the cost of increased encoding
+	   time. For lossless, this is a size/speed tradeoff. Higher values
+	   give smaller size at the cost of increased encoding time. More
+	   specifically, it controls the number of extra algorithms and
+	   compression tools used, and varies the combination of these tools.
+	   This maps to the method option in libwebp. The valid range is 0 to
+	   6.  Default is 4.
+
+       -quality float
+	   For lossy encoding, this controls image quality. For lossless
+	   encoding, this controls the effort and time spent in compression.
+	   Range is 0 to 100. Default is 75.
+
+       -preset type
+	   Configuration preset. This does some automatic settings based on
+	   the general type of the image.
+
+	   none
+	       Do not use a preset.
+
+	   default
+	       Use the encoder default.
+
+	   picture
+	       Digital picture, like portrait, inner shot
+
+	   photo
+	       Outdoor photograph, with natural lighting
+
+	   drawing
+	       Hand or line drawing, with high-contrast details
+
+	   icon
+	       Small-sized colorful images
+
+	   text
+	       Text-like
+
+   libx264, libx264rgb
+       x264 H.264/MPEG-4 AVC encoder wrapper.
+
+       This encoder requires the presence of the libx264 headers and library
+       during configuration. You need to explicitly configure the build with
+       "--enable-libx264".
+
+       libx264 supports an impressive number of features, including 8x8 and
+       4x4 adaptive spatial transform, adaptive B-frame placement, CAVLC/CABAC
+       entropy coding, interlacing (MBAFF), lossless mode, psy optimizations
+       for detail retention (adaptive quantization, psy-RD, psy-trellis).
+
+       Many libx264 encoder options are mapped to FFmpeg global codec options,
+       while unique encoder options are provided through private options.
+       Additionally the x264opts and x264-params private options allows one to
+       pass a list of key=value tuples as accepted by the libx264
+       "x264_param_parse" function.
+
+       The x264 project website is at
+       <http://www.videolan.org/developers/x264.html>.
+
+       The libx264rgb encoder is the same as libx264, except it accepts packed
+       RGB pixel formats as input instead of YUV.
+
+       Supported Pixel Formats
+
+       x264 supports 8- to 10-bit color spaces. The exact bit depth is
+       controlled at x264's configure time.
+
+       Options
+
+       The following options are supported by the libx264 wrapper. The
+       x264-equivalent options or values are listed in parentheses for easy
+       migration.
+
+       To reduce the duplication of documentation, only the private options
+       and some others requiring special attention are documented here. For
+       the documentation of the undocumented generic options, see the Codec
+       Options chapter.
+
+       To get a more accurate and extensive documentation of the libx264
+       options, invoke the command x264 --fullhelp or consult the libx264
+       documentation.
+
+       In the list below, note that the x264 option name is shown in
+       parentheses after the libavcodec corresponding name, in case there is a
+       direct mapping.
+
+       b (bitrate)
+	   Set bitrate in bits/s. Note that FFmpeg's b option is expressed in
+	   bits/s, while x264's bitrate is in kilobits/s.
+
+       bf (bframes)
+	   Number of B-frames between I and P-frames
+
+       g (keyint)
+	   Maximum GOP size
+
+       qmin (qpmin)
+	   Minimum quantizer scale
+
+       qmax (qpmax)
+	   Maximum quantizer scale
+
+       qdiff (qpstep)
+	   Maximum difference between quantizer scales
+
+       qblur (qblur)
+	   Quantizer curve blur
+
+       qcomp (qcomp)
+	   Quantizer curve compression factor
+
+       refs (ref)
+	   Number of reference frames each P-frame can use. The range is 0-16.
+
+       level (level)
+	   Set the "x264_param_t.i_level_idc" value in case the value is
+	   positive, it is ignored otherwise.
+
+	   This value can be set using the "AVCodecContext" API (e.g. by
+	   setting the "AVCodecContext" value directly), and is specified as
+	   an integer mapped on a corresponding level (e.g. the value 31 maps
+	   to H.264 level IDC "3.1", as defined in the "x264_levels" table).
+	   It is ignored when set to a non positive value.
+
+	   Alternatively it can be set as a private option, overriding the
+	   value set in "AVCodecContext", and in this case must be specified
+	   as the level IDC identifier (e.g. "3.1"), as defined by H.264 Annex
+	   A.
+
+       sc_threshold (scenecut)
+	   Sets the threshold for the scene change detection.
+
+       trellis (trellis)
+	   Performs Trellis quantization to increase efficiency. Enabled by
+	   default.
+
+       nr (nr)
+	   Noise reduction
+
+       me_range (merange)
+	   Maximum range of the motion search in pixels.
+
+       me_method (me)
+	   Set motion estimation method. Possible values in the decreasing
+	   order of speed:
+
+	   dia (dia)
+	   epzs (dia)
+	       Diamond search with radius 1 (fastest). epzs is an alias for
+	       dia.
+
+	   hex (hex)
+	       Hexagonal search with radius 2.
+
+	   umh (umh)
+	       Uneven multi-hexagon search.
+
+	   esa (esa)
+	       Exhaustive search.
+
+	   tesa (tesa)
+	       Hadamard exhaustive search (slowest).
+
+       forced-idr
+	   Normally, when forcing a I-frame type, the encoder can select any
+	   type of I-frame. This option forces it to choose an IDR-frame.
+
+       subq (subme)
+	   Sub-pixel motion estimation method.
+
+       b_strategy (b-adapt)
+	   Adaptive B-frame placement decision algorithm. Use only on first-
+	   pass.
+
+       keyint_min (min-keyint)
+	   Minimum GOP size.
+
+       coder
+	   Set entropy encoder. Possible values:
+
+	   ac  Enable CABAC.
+
+	   vlc Enable CAVLC and disable CABAC. It generates the same effect as
+	       x264's --no-cabac option.
+
+       cmp Set full pixel motion estimation comparison algorithm. Possible
+	   values:
+
+	   chroma
+	       Enable chroma in motion estimation.
+
+	   sad Ignore chroma in motion estimation. It generates the same
+	       effect as x264's --no-chroma-me option.
+
+       threads (threads)
+	   Number of encoding threads.
+
+       thread_type
+	   Set multithreading technique. Possible values:
+
+	   slice
+	       Slice-based multithreading. It generates the same effect as
+	       x264's --sliced-threads option.
+
+	   frame
+	       Frame-based multithreading.
+
+       flags
+	   Set encoding flags. It can be used to disable closed GOP and enable
+	   open GOP by setting it to "-cgop". The result is similar to the
+	   behavior of x264's --open-gop option.
+
+       rc_init_occupancy (vbv-init)
+	   Initial VBV buffer occupancy
+
+       preset (preset)
+	   Set the encoding preset.
+
+       tune (tune)
+	   Set tuning of the encoding params.
+
+       profile (profile)
+	   Set profile restrictions.
+
+       fastfirstpass
+	   Enable fast settings when encoding first pass, when set to 1. When
+	   set to 0, it has the same effect of x264's --slow-firstpass option.
+
+       crf (crf)
+	   Set the quality for constant quality mode.
+
+       crf_max (crf-max)
+	   In CRF mode, prevents VBV from lowering quality beyond this point.
+
+       qp (qp)
+	   Set constant quantization rate control method parameter.
+
+       aq-mode (aq-mode)
+	   Set AQ method. Possible values:
+
+	   none (0)
+	       Disabled.
+
+	   variance (1)
+	       Variance AQ (complexity mask).
+
+	   autovariance (2)
+	       Auto-variance AQ (experimental).
+
+       aq-strength (aq-strength)
+	   Set AQ strength, reduce blocking and blurring in flat and textured
+	   areas.
+
+       psy Use psychovisual optimizations when set to 1. When set to 0, it has
+	   the same effect as x264's --no-psy option.
+
+       psy-rd (psy-rd)
+	   Set strength of psychovisual optimization, in psy-rd:psy-trellis
+	   format.
+
+       rc-lookahead (rc-lookahead)
+	   Set number of frames to look ahead for frametype and ratecontrol.
+
+       weightb
+	   Enable weighted prediction for B-frames when set to 1. When set to
+	   0, it has the same effect as x264's --no-weightb option.
+
+       weightp (weightp)
+	   Set weighted prediction method for P-frames. Possible values:
+
+	   none (0)
+	       Disabled
+
+	   simple (1)
+	       Enable only weighted refs
+
+	   smart (2)
+	       Enable both weighted refs and duplicates
+
+       ssim (ssim)
+	   Enable calculation and printing SSIM stats after the encoding.
+
+       intra-refresh (intra-refresh)
+	   Enable the use of Periodic Intra Refresh instead of IDR frames when
+	   set to 1.
+
+       avcintra-class (class)
+	   Configure the encoder to generate AVC-Intra.  Valid values are 50,
+	   100 and 200
+
+       bluray-compat (bluray-compat)
+	   Configure the encoder to be compatible with the bluray standard.
+	   It is a shorthand for setting "bluray-compat=1 force-cfr=1".
+
+       b-bias (b-bias)
+	   Set the influence on how often B-frames are used.
+
+       b-pyramid (b-pyramid)
+	   Set method for keeping of some B-frames as references. Possible
+	   values:
+
+	   none (none)
+	       Disabled.
+
+	   strict (strict)
+	       Strictly hierarchical pyramid.
+
+	   normal (normal)
+	       Non-strict (not Blu-ray compatible).
+
+       mixed-refs
+	   Enable the use of one reference per partition, as opposed to one
+	   reference per macroblock when set to 1. When set to 0, it has the
+	   same effect as x264's --no-mixed-refs option.
+
+       8x8dct
+	   Enable adaptive spatial transform (high profile 8x8 transform) when
+	   set to 1. When set to 0, it has the same effect as x264's
+	   --no-8x8dct option.
+
+       fast-pskip
+	   Enable early SKIP detection on P-frames when set to 1. When set to
+	   0, it has the same effect as x264's --no-fast-pskip option.
+
+       aud (aud)
+	   Enable use of access unit delimiters when set to 1.
+
+       mbtree
+	   Enable use macroblock tree ratecontrol when set to 1. When set to
+	   0, it has the same effect as x264's --no-mbtree option.
+
+       deblock (deblock)
+	   Set loop filter parameters, in alpha:beta form.
+
+       cplxblur (cplxblur)
+	   Set fluctuations reduction in QP (before curve compression).
+
+       partitions (partitions)
+	   Set partitions to consider as a comma-separated list of values.
+	   Possible values in the list:
+
+	   p8x8
+	       8x8 P-frame partition.
+
+	   p4x4
+	       4x4 P-frame partition.
+
+	   b8x8
+	       4x4 B-frame partition.
+
+	   i8x8
+	       8x8 I-frame partition.
+
+	   i4x4
+	       4x4 I-frame partition.  (Enabling p4x4 requires p8x8 to be
+	       enabled. Enabling i8x8 requires adaptive spatial transform
+	       (8x8dct option) to be enabled.)
+
+	   none (none)
+	       Do not consider any partitions.
+
+	   all (all)
+	       Consider every partition.
+
+       direct-pred (direct)
+	   Set direct MV prediction mode. Possible values:
+
+	   none (none)
+	       Disable MV prediction.
+
+	   spatial (spatial)
+	       Enable spatial predicting.
+
+	   temporal (temporal)
+	       Enable temporal predicting.
+
+	   auto (auto)
+	       Automatically decided.
+
+       slice-max-size (slice-max-size)
+	   Set the limit of the size of each slice in bytes. If not specified
+	   but RTP payload size (ps) is specified, that is used.
+
+       stats (stats)
+	   Set the file name for multi-pass stats.
+
+       nal-hrd (nal-hrd)
+	   Set signal HRD information (requires vbv-bufsize to be set).
+	   Possible values:
+
+	   none (none)
+	       Disable HRD information signaling.
+
+	   vbr (vbr)
+	       Variable bit rate.
+
+	   cbr (cbr)
+	       Constant bit rate (not allowed in MP4 container).
+
+       x264opts opts
+       x264-params opts
+	   Override the x264 configuration using a :-separated list of
+	   key=value options.
+
+	   The argument for both options is a list of key=value couples
+	   separated by ":". With x264opts the value can be omitted, and the
+	   value 1 is assumed in that case.
+
+	   For filter and psy-rd options values that use ":" as a separator
+	   themselves, use "," instead. They accept it as well since long ago
+	   but this is kept undocumented for some reason.
+
+	   For example, the options might be provided as:
+
+		   level=30:bframes=0:weightp=0:cabac=0:ref=1:vbv-maxrate=768:vbv-bufsize=2000:analyse=all:me=umh:no-fast-pskip=1:subq=6:8x8dct=0:trellis=0
+
+	   For example to specify libx264 encoding options with ffmpeg:
+
+		   ffmpeg -i foo.mpg -c:v libx264 -x264opts keyint=123:min-keyint=20 -an out.mkv
+
+	   To get the complete list of the libx264 options, invoke the command
+	   x264 --fullhelp or consult the libx264 documentation.
+
+       a53cc boolean
+	   Import closed captions (which must be ATSC compatible format) into
+	   output.  Only the mpeg2 and h264 decoders provide these. Default is
+	   1 (on).
+
+       udu_sei boolean
+	   Import user data unregistered SEI if available into output. Default
+	   is 0 (off).
+
+       mb_info boolean
+	   Set mb_info data through AVFrameSideData, only useful when used
+	   from the API. Default is 0 (off).
+
+       Encoding ffpresets for common usages are provided so they can be used
+       with the general presets system (e.g. passing the pre option).
+
+   libx265
+       x265 H.265/HEVC encoder wrapper.
+
+       This encoder requires the presence of the libx265 headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libx265.
+
+       Options
+
+       b   Sets target video bitrate.
+
+       bf
+       g   Set the GOP size.
+
+       keyint_min
+	   Minimum GOP size.
+
+       refs
+	   Number of reference frames each P-frame can use. The range is from
+	   1-16.
+
+       preset
+	   Set the x265 preset.
+
+       tune
+	   Set the x265 tune parameter.
+
+       profile
+	   Set profile restrictions.
+
+       crf Set the quality for constant quality mode.
+
+       qp  Set constant quantization rate control method parameter.
+
+       qmin
+	   Minimum quantizer scale.
+
+       qmax
+	   Maximum quantizer scale.
+
+       qdiff
+	   Maximum difference between quantizer scales.
+
+       qblur
+	   Quantizer curve blur
+
+       qcomp
+	   Quantizer curve compression factor
+
+       i_qfactor
+       b_qfactor
+       forced-idr
+	   Normally, when forcing a I-frame type, the encoder can select any
+	   type of I-frame. This option forces it to choose an IDR-frame.
+
+       udu_sei boolean
+	   Import user data unregistered SEI if available into output. Default
+	   is 0 (off).
+
+       x265-params
+	   Set x265 options using a list of key=value couples separated by
+	   ":". See x265 --help for a list of options.
+
+	   For example to specify libx265 encoding options with -x265-params:
+
+		   ffmpeg -i input -c:v libx265 -x265-params crf=26:psy-rd=1 output.mp4
+
+   libxavs2
+       xavs2 AVS2-P2/IEEE1857.4 encoder wrapper.
+
+       This encoder requires the presence of the libxavs2 headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libxavs2.
+
+       The following standard libavcodec options are used:
+
+       o   b / bit_rate
+
+       o   g / gop_size
+
+       o   bf / max_b_frames
+
+       The encoder also has its own specific options:
+
+       Options
+
+       lcu_row_threads
+	   Set the number of parallel threads for rows from 1 to 8 (default
+	   5).
+
+       initial_qp
+	   Set the xavs2 quantization parameter from 1 to 63 (default 34).
+	   This is used to set the initial qp for the first frame.
+
+       qp  Set the xavs2 quantization parameter from 1 to 63 (default 34).
+	   This is used to set the qp value under constant-QP mode.
+
+       max_qp
+	   Set the max qp for rate control from 1 to 63 (default 55).
+
+       min_qp
+	   Set the min qp for rate control from 1 to 63 (default 20).
+
+       speed_level
+	   Set the Speed level from 0 to 9 (default 0). Higher is better but
+	   slower.
+
+       log_level
+	   Set the log level from -1 to 3 (default 0). -1: none, 0: error, 1:
+	   warning, 2: info, 3: debug.
+
+       xavs2-params
+	   Set xavs2 options using a list of key=value couples separated by
+	   ":".
+
+	   For example to specify libxavs2 encoding options with
+	   -xavs2-params:
+
+		   ffmpeg -i input -c:v libxavs2 -xavs2-params RdoqLevel=0 output.avs2
+
+   libxeve
+       eXtra-fast Essential Video Encoder (XEVE) MPEG-5 EVC encoder wrapper.
+       The xeve-equivalent options or values are listed in parentheses for
+       easy migration.
+
+       This encoder requires the presence of the libxeve headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libxeve.
+
+	   Many libxeve encoder options are mapped to FFmpeg global codec
+	   options, while unique encoder options are provided through private
+	   options.  Additionally the xeve-params private options allows one
+	   to pass a list of key=value tuples as accepted by the libxeve
+	   "parse_xeve_params" function.
+
+       The xeve project website is at <https://github.com/mpeg5/xeve>.
+
+       Options
+
+       The following options are supported by the libxeve wrapper.  The xeve-
+       equivalent options or values are listed in parentheses for easy
+       migration.
+
+	   To reduce the duplication of documentation, only the private
+	   options and some others requiring special attention are documented
+	   here. For the documentation of the undocumented generic options,
+	   see the Codec Options chapter.
+
+	   To get a more accurate and extensive documentation of the libxeve
+	   options, invoke the command	"xeve_app --help" or consult the
+	   libxeve documentation.
+
+       b (bitrate)
+	   Set target video bitrate in bits/s.	Note that FFmpeg's b option is
+	   expressed in bits/s, while xeve's bitrate is in kilobits/s.
+
+       bf (bframes)
+	   Set the maximum number of B frames (1,3,7,15).
+
+       g (keyint)
+	   Set the GOP size (I-picture period).
+
+       preset (preset)
+	   Set the xeve preset.  Set the encoder preset value to determine
+	   encoding speed [fast, medium, slow, placebo]
+
+       tune (tune)
+	   Set the encoder tune parameter [psnr, zerolatency]
+
+       profile (profile)
+	   Set the encoder profile [0: baseline; 1: main]
+
+       crf (crf)
+	   Set the quality for constant quality mode.  Constant rate factor
+	   <10..49> [default: 32]
+
+       qp (qp)
+	   Set constant quantization rate control method parameter.
+	   Quantization parameter qp <0..51> [default: 32]
+
+       threads (threads)
+	   Force to use a specific number of threads
+
+   libxvid
+       Xvid MPEG-4 Part 2 encoder wrapper.
+
+       This encoder requires the presence of the libxvidcore headers and
+       library during configuration. You need to explicitly configure the
+       build with "--enable-libxvid --enable-gpl".
+
+       The native "mpeg4" encoder supports the MPEG-4 Part 2 format, so users
+       can encode to this format without this library.
+
+       Options
+
+       The following options are supported by the libxvid wrapper. Some of the
+       following options are listed but are not documented, and correspond to
+       shared codec options. See the Codec Options chapter for their
+       documentation. The other shared options which are not listed have no
+       effect for the libxvid encoder.
+
+       b
+       g
+       qmin
+       qmax
+       mpeg_quant
+       threads
+       bf
+       b_qfactor
+       b_qoffset
+       flags
+	   Set specific encoding flags. Possible values:
+
+	   mv4 Use four motion vector by macroblock.
+
+	   aic Enable high quality AC prediction.
+
+	   gray
+	       Only encode grayscale.
+
+	   qpel
+	       Enable quarter-pixel motion compensation.
+
+	   cgop
+	       Enable closed GOP.
+
+	   global_header
+	       Place global headers in extradata instead of every keyframe.
+
+       gmc Enable the use of global motion compensation (GMC).	Default is 0
+	   (disabled).
+
+       me_quality
+	   Set motion estimation quality level. Possible values in decreasing
+	   order of speed and increasing order of quality:
+
+	   0   Use no motion estimation (default).
+
+	   1, 2
+	       Enable advanced diamond zonal search for 16x16 blocks and half-
+	       pixel refinement for 16x16 blocks.
+
+	   3, 4
+	       Enable all of the things described above, plus advanced diamond
+	       zonal search for 8x8 blocks and half-pixel refinement for 8x8
+	       blocks, also enable motion estimation on chroma planes for P
+	       and B-frames.
+
+	   5, 6
+	       Enable all of the things described above, plus extended 16x16
+	       and 8x8 blocks search.
+
+       mbd Set macroblock decision algorithm. Possible values in the
+	   increasing order of quality:
+
+	   simple
+	       Use macroblock comparing function algorithm (default).
+
+	   bits
+	       Enable rate distortion-based half pixel and quarter pixel
+	       refinement for 16x16 blocks.
+
+	   rd  Enable all of the things described above, plus rate distortion-
+	       based half pixel and quarter pixel refinement for 8x8 blocks,
+	       and rate distortion-based search using square pattern.
+
+       lumi_aq
+	   Enable lumi masking adaptive quantization when set to 1. Default is
+	   0 (disabled).
+
+       variance_aq
+	   Enable variance adaptive quantization when set to 1. Default is 0
+	   (disabled).
+
+	   When combined with lumi_aq, the resulting quality will not be
+	   better than any of the two specified individually. In other words,
+	   the resulting quality will be the worse one of the two effects.
+
+       trellis
+	   Set rate-distortion optimal quantization.
+
+       ssim
+	   Set structural similarity (SSIM) displaying method. Possible
+	   values:
+
+	   off Disable displaying of SSIM information.
+
+	   avg Output average SSIM at the end of encoding to stdout. The
+	       format of showing the average SSIM is:
+
+		       Average SSIM: %f
+
+	       For users who are not familiar with C, %f means a float number,
+	       or a decimal (e.g. 0.939232).
+
+	   frame
+	       Output both per-frame SSIM data during encoding and average
+	       SSIM at the end of encoding to stdout. The format of per-frame
+	       information is:
+
+			      SSIM: avg: %1.3f min: %1.3f max: %1.3f
+
+	       For users who are not familiar with C, %1.3f means a float
+	       number rounded to 3 digits after the dot (e.g. 0.932).
+
+       ssim_acc
+	   Set SSIM accuracy. Valid options are integers within the range of
+	   0-4, while 0 gives the most accurate result and 4 computes the
+	   fastest.
+
+   MediaFoundation
+       This provides wrappers to encoders (both audio and video) in the
+       MediaFoundation framework. It can access both SW and HW encoders.
+       Video encoders can take input in either of nv12 or yuv420p form (some
+       encoders support both, some support only either - in practice, nv12 is
+       the safer choice, especially among HW encoders).
+
+   Microsoft RLE
+       Microsoft RLE aka MSRLE encoder.  Only 8-bit palette mode supported.
+       Compatible with Windows 3.1 and Windows 95.
+
+       Options
+
+       g integer
+	   Keyframe interval.  A keyframe is inserted at least every "-g"
+	   frames, sometimes sooner.
+
+   mpeg2
+       MPEG-2 video encoder.
+
+       Options
+
+       profile
+	   Select the mpeg2 profile to encode:
+
+	   422
+	   high
+	   ss  Spatially Scalable
+
+	   snr SNR Scalable
+
+	   main
+	   simple
+       level
+	   Select the mpeg2 level to encode:
+
+	   high
+	   high1440
+	   main
+	   low
+       seq_disp_ext integer
+	   Specifies if the encoder should write a sequence_display_extension
+	   to the output.
+
+	   -1
+	   auto
+	       Decide automatically to write it or not (this is the default)
+	       by checking if the data to be written is different from the
+	       default or unspecified values.
+
+	   0
+	   never
+	       Never write it.
+
+	   1
+	   always
+	       Always write it.
+
+       video_format integer
+	   Specifies the video_format written into the sequence display
+	   extension indicating the source of the video pictures. The default
+	   is unspecified, can be component, pal, ntsc, secam or mac.  For
+	   maximum compatibility, use component.
+
+       a53cc boolean
+	   Import closed captions (which must be ATSC compatible format) into
+	   output.  Default is 1 (on).
+
+   png
+       PNG image encoder.
+
+       Private options
+
+       dpi integer
+	   Set physical density of pixels, in dots per inch, unset by default
+
+       dpm integer
+	   Set physical density of pixels, in dots per meter, unset by default
+
+   ProRes
+       Apple ProRes encoder.
+
+       FFmpeg contains 2 ProRes encoders, the prores-aw and prores-ks encoder.
+       The used encoder can be chosen with the "-vcodec" option.
+
+       Private Options for prores-ks
+
+       profile integer
+	   Select the ProRes profile to encode
+
+	   proxy
+	   lt
+	   standard
+	   hq
+	   4444
+	   4444xq
+       quant_mat integer
+	   Select quantization matrix.
+
+	   auto
+	   default
+	   proxy
+	   lt
+	   standard
+	   hq
+
+	   If set to auto, the matrix matching the profile will be picked.  If
+	   not set, the matrix providing the highest quality, default, will be
+	   picked.
+
+       bits_per_mb integer
+	   How many bits to allot for coding one macroblock. Different
+	   profiles use between 200 and 2400 bits per macroblock, the maximum
+	   is 8000.
+
+       mbs_per_slice integer
+	   Number of macroblocks in each slice (1-8); the default value (8)
+	   should be good in almost all situations.
+
+       vendor string
+	   Override the 4-byte vendor ID.  A custom vendor ID like apl0 would
+	   claim the stream was produced by the Apple encoder.
+
+       alpha_bits integer
+	   Specify number of bits for alpha component.	Possible values are 0,
+	   8 and 16.  Use 0 to disable alpha plane coding.
+
+       Speed considerations
+
+       In the default mode of operation the encoder has to honor frame
+       constraints (i.e. not produce frames with size bigger than requested)
+       while still making output picture as good as possible.  A frame
+       containing a lot of small details is harder to compress and the encoder
+       would spend more time searching for appropriate quantizers for each
+       slice.
+
+       Setting a higher bits_per_mb limit will improve the speed.
+
+       For the fastest encoding speed set the qscale parameter (4 is the
+       recommended value) and do not set a size constraint.
+
+   QSV Encoders
+       The family of Intel QuickSync Video encoders (MPEG-2, H.264, HEVC,
+       JPEG/MJPEG, VP9, AV1)
+
+       Ratecontrol Method
+
+       The ratecontrol method is selected as follows:
+
+       o   When global_quality is specified, a quality-based mode is used.
+	   Specifically this means either
+
+	   -   CQP - constant quantizer scale, when the qscale codec flag is
+	       also set (the -qscale ffmpeg option).
+
+	   -   LA_ICQ - intelligent constant quality with lookahead, when the
+	       look_ahead option is also set.
+
+	   -   ICQ -- intelligent constant quality otherwise. For the ICQ
+	       modes, global quality range is 1 to 51, with 1 being the best
+	       quality.
+
+       o   Otherwise when the desired average bitrate is specified with the b
+	   option, a bitrate-based mode is used.
+
+	   -   LA - VBR with lookahead, when the look_ahead option is
+	       specified.
+
+	   -   VCM - video conferencing mode, when the vcm option is set.
+
+	   -   CBR - constant bitrate, when maxrate is specified and equal to
+	       the average bitrate.
+
+	   -   VBR - variable bitrate, when maxrate is specified, but is
+	       higher than the average bitrate.
+
+	   -   AVBR - average VBR mode, when maxrate is not specified, both
+	       avbr_accuracy and avbr_convergence are set to non-zero. This
+	       mode is available for H264 and HEVC on Windows.
+
+       o   Otherwise the default ratecontrol method CQP is used.
+
+       Note that depending on your system, a different mode than the one you
+       specified may be selected by the encoder. Set the verbosity level to
+       verbose or higher to see the actual settings used by the QSV runtime.
+
+       Global Options -> MSDK Options
+
+       Additional libavcodec global options are mapped to MSDK options as
+       follows:
+
+       o   g/gop_size -> GopPicSize
+
+       o   bf/max_b_frames+1 -> GopRefDist
+
+       o   rc_init_occupancy/rc_initial_buffer_occupancy -> InitialDelayInKB
+
+       o   slices -> NumSlice
+
+       o   refs -> NumRefFrame
+
+       o   b_strategy/b_frame_strategy -> BRefType
+
+       o   cgop/CLOSED_GOP codec flag -> GopOptFlag
+
+       o   For the CQP mode, the i_qfactor/i_qoffset and b_qfactor/b_qoffset
+	   set the difference between QPP and QPI, and QPP and QPB
+	   respectively.
+
+       o   Setting the coder option to the value vlc will make the H.264
+	   encoder use CAVLC instead of CABAC.
+
+       Common Options
+
+       Following options are used by all qsv encoders.
+
+       async_depth
+	   Specifies how many asynchronous operations an application performs
+	   before the application explicitly synchronizes the result. If zero,
+	   the value is not specified.
+
+       preset
+	   This option itemizes a range of choices from veryfast (best speed)
+	   to veryslow (best quality).
+
+	   veryfast
+	   faster
+	   fast
+	   medium
+	   slow
+	   slower
+	   veryslow
+       forced_idr
+	   Forcing I frames as IDR frames.
+
+       low_power
+	   For encoders set this flag to ON to reduce power consumption and
+	   GPU usage.
+
+       Runtime Options
+
+       Following options can be used durning qsv encoding.
+
+       global_quality
+       i_quant_factor
+       i_quant_offset
+       b_quant_factor
+       b_quant_offset
+	   Supported in h264_qsv and hevc_qsv.	Change these value to reset
+	   qsv codec's qp configuration.
+
+       max_frame_size
+	   Supported in h264_qsv and hevc_qsv.	Change this value to reset qsv
+	   codec's MaxFrameSize configuration.
+
+       gop_size
+	   Change this value to reset qsv codec's gop configuration.
+
+       int_ref_type
+       int_ref_cycle_size
+       int_ref_qp_delta
+       int_ref_cycle_dist
+	   Supported in h264_qsv and hevc_qsv.	Change these value to reset
+	   qsv codec's Intra Refresh configuration.
+
+       qmax
+       qmin
+       max_qp_i
+       min_qp_i
+       max_qp_p
+       min_qp_p
+       max_qp_b
+       min_qp_b
+	   Supported in h264_qsv.  Change these value to reset qsv codec's
+	   max/min qp configuration.
+
+       low_delay_brc
+	   Supported in h264_qsv, hevc_qsv and av1_qsv.  Change this value to
+	   reset qsv codec's low_delay_brc configuration.
+
+       framerate
+	   Change this value to reset qsv codec's framerate configuration.
+
+       bit_rate
+       rc_buffer_size
+       rc_initial_buffer_occupancy
+       rc_max_rate
+	   Change these value to reset qsv codec's bitrate control
+	   configuration.
+
+       pic_timing_sei
+	   Supported in h264_qsv and hevc_qsv.	Change this value to reset qsv
+	   codec's pic_timing_sei configuration.
+
+       H264 options
+
+       These options are used by h264_qsv
+
+       extbrc
+	   Extended bitrate control.
+
+       recovery_point_sei
+	   Set this flag to insert the recovery point SEI message at the
+	   beginning of every intra refresh cycle.
+
+       rdo Enable rate distortion optimization.
+
+       max_frame_size
+	   Maximum encoded frame size in bytes.
+
+       max_frame_size_i
+	   Maximum encoded frame size for I frames in bytes. If this value is
+	   set as larger than zero, then for I frames the value set by
+	   max_frame_size is ignored.
+
+       max_frame_size_p
+	   Maximum encoded frame size for P frames in bytes. If this value is
+	   set as larger than zero, then for P frames the value set by
+	   max_frame_size is ignored.
+
+       max_slice_size
+	   Maximum encoded slice size in bytes.
+
+       bitrate_limit
+	   Toggle bitrate limitations.	Modifies bitrate to be in the range
+	   imposed by the QSV encoder. Setting this flag off may lead to
+	   violation of HRD conformance. Mind that specifying bitrate below
+	   the QSV encoder range might significantly affect quality. If on
+	   this option takes effect in non CQP modes: if bitrate is not in the
+	   range imposed by the QSV encoder, it will be changed to be in the
+	   range.
+
+       mbbrc
+	   Setting this flag enables macroblock level bitrate control that
+	   generally improves subjective visual quality. Enabling this flag
+	   may have negative impact on performance and objective visual
+	   quality metric.
+
+       low_delay_brc
+	   Setting this flag turns on or off LowDelayBRC feautre in qsv
+	   plugin, which provides more accurate bitrate control to minimize
+	   the variance of bitstream size frame by frame. Value: -1-default
+	   0-off 1-on
+
+       adaptive_i
+	   This flag controls insertion of I frames by the QSV encoder. Turn
+	   ON this flag to allow changing of frame type from P and B to I.
+
+       adaptive_b
+	   This flag controls changing of frame type from B to P.
+
+       p_strategy
+	   Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to
+	   0).
+
+       b_strategy
+	   This option controls usage of B frames as reference.
+
+       dblk_idc
+	   This option disable deblocking. It has value in range 0~2.
+
+       cavlc
+	   If set, CAVLC is used; if unset, CABAC is used for encoding.
+
+       vcm Video conferencing mode, please see ratecontrol method.
+
+       idr_interval
+	   Distance (in I-frames) between IDR frames.
+
+       pic_timing_sei
+	   Insert picture timing SEI with pic_struct_syntax element.
+
+       single_sei_nal_unit
+	   Put all the SEI messages into one NALU.
+
+       max_dec_frame_buffering
+	   Maximum number of frames buffered in the DPB.
+
+       look_ahead
+	   Use VBR algorithm with look ahead.
+
+       look_ahead_depth
+	   Depth of look ahead in number frames.
+
+       look_ahead_downsampling
+	   Downscaling factor for the frames saved for the lookahead analysis.
+
+	   unknown
+	   auto
+	   off
+	   2x
+	   4x
+       int_ref_type
+	   Specifies intra refresh type. The major goal of intra refresh is
+	   improvement of error resilience without significant impact on
+	   encoded bitstream size caused by I frames. The SDK encoder achieves
+	   this by encoding part of each frame in refresh cycle using intra
+	   MBs. none means no refresh. vertical means vertical refresh, by
+	   column of MBs. horizontal means horizontal refresh, by rows of MBs.
+	   slice means horizontal refresh by slices without overlapping. In
+	   case of slice, in_ref_cycle_size is ignored. To enable intra
+	   refresh, B frame should be set to 0.
+
+       int_ref_cycle_size
+	   Specifies number of pictures within refresh cycle starting from 2.
+	   0 and 1 are invalid values.
+
+       int_ref_qp_delta
+	   Specifies QP difference for inserted intra MBs. This is signed
+	   value in [-51, 51] range if target encoding bit-depth for luma
+	   samples is 8 and this range is [-63, 63] for 10 bit-depth or [-75,
+	   75] for 12 bit-depth respectively.
+
+       int_ref_cycle_dist
+	   Distance between the beginnings of the intra-refresh cycles in
+	   frames.
+
+       profile
+	   unknown
+	   baseline
+	   main
+	   high
+       a53cc
+	   Use A53 Closed Captions (if available).
+
+       aud Insert the Access Unit Delimiter NAL.
+
+       mfmode
+	   Multi-Frame Mode.
+
+	   off
+	   auto
+       repeat_pps
+	   Repeat pps for every frame.
+
+       max_qp_i
+	   Maximum video quantizer scale for I frame.
+
+       min_qp_i
+	   Minimum video quantizer scale for I frame.
+
+       max_qp_p
+	   Maximum video quantizer scale for P frame.
+
+       min_qp_p
+	   Minimum video quantizer scale for P frame.
+
+       max_qp_b
+	   Maximum video quantizer scale for B frame.
+
+       min_qp_b
+	   Minimum video quantizer scale for B frame.
+
+       scenario
+	   Provides a hint to encoder about the scenario for the encoding
+	   session.
+
+	   unknown
+	   displayremoting
+	   videoconference
+	   archive
+	   livestreaming
+	   cameracapture
+	   videosurveillance
+	   gamestreaming
+	   remotegaming
+       avbr_accuracy
+	   Accuracy of the AVBR ratecontrol (unit of tenth of percent).
+
+       avbr_convergence
+	   Convergence of the AVBR ratecontrol (unit of 100 frames)
+
+	   The parameters avbr_accuracy and avbr_convergence are for the
+	   average variable bitrate control (AVBR) algorithm.  The algorithm
+	   focuses on overall encoding quality while meeting the specified
+	   bitrate, target_bitrate, within the accuracy range avbr_accuracy,
+	   after a avbr_Convergence period. This method does not follow HRD
+	   and the instant bitrate is not capped or padded.
+
+       skip_frame
+	   Use per-frame metadata "qsv_skip_frame" to skip frame when
+	   encoding. This option defines the usage of this metadata.
+
+	   no_skip
+	       Frame skipping is disabled.
+
+	   insert_dummy
+	       Encoder inserts into bitstream frame where all macroblocks are
+	       encoded as skipped.
+
+	   insert_nothing
+	       Similar to insert_dummy, but encoder inserts nothing into
+	       bitstream. The skipped frames are still used in brc. For
+	       example, gop still include skipped frames, and the frames after
+	       skipped frames will be larger in size.
+
+	   brc_only
+	       skip_frame metadata indicates the number of missed frames
+	       before the current frame.
+
+       HEVC Options
+
+       These options are used by hevc_qsv
+
+       extbrc
+	   Extended bitrate control.
+
+       recovery_point_sei
+	   Set this flag to insert the recovery point SEI message at the
+	   beginning of every intra refresh cycle.
+
+       rdo Enable rate distortion optimization.
+
+       max_frame_size
+	   Maximum encoded frame size in bytes.
+
+       max_frame_size_i
+	   Maximum encoded frame size for I frames in bytes. If this value is
+	   set as larger than zero, then for I frames the value set by
+	   max_frame_size is ignored.
+
+       max_frame_size_p
+	   Maximum encoded frame size for P frames in bytes. If this value is
+	   set as larger than zero, then for P frames the value set by
+	   max_frame_size is ignored.
+
+       max_slice_size
+	   Maximum encoded slice size in bytes.
+
+       mbbrc
+	   Setting this flag enables macroblock level bitrate control that
+	   generally improves subjective visual quality. Enabling this flag
+	   may have negative impact on performance and objective visual
+	   quality metric.
+
+       low_delay_brc
+	   Setting this flag turns on or off LowDelayBRC feautre in qsv
+	   plugin, which provides more accurate bitrate control to minimize
+	   the variance of bitstream size frame by frame. Value: -1-default
+	   0-off 1-on
+
+       adaptive_i
+	   This flag controls insertion of I frames by the QSV encoder. Turn
+	   ON this flag to allow changing of frame type from P and B to I.
+
+       adaptive_b
+	   This flag controls changing of frame type from B to P.
+
+       p_strategy
+	   Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to
+	   0).
+
+       b_strategy
+	   This option controls usage of B frames as reference.
+
+       dblk_idc
+	   This option disable deblocking. It has value in range 0~2.
+
+       idr_interval
+	   Distance (in I-frames) between IDR frames.
+
+	   begin_only
+	       Output an IDR-frame only at the beginning of the stream.
+
+       load_plugin
+	   A user plugin to load in an internal session.
+
+	   none
+	   hevc_sw
+	   hevc_hw
+       load_plugins
+	   A :-separate list of hexadecimal plugin UIDs to load in an internal
+	   session.
+
+       look_ahead_depth
+	   Depth of look ahead in number frames, available when extbrc option
+	   is enabled.
+
+       profile
+	   Set the encoding profile (scc requires libmfx >= 1.32).
+
+	   unknown
+	   main
+	   main10
+	   mainsp
+	   rext
+	   scc
+       tier
+	   Set the encoding tier (only level >= 4 can support high tier).
+	   This option only takes effect when the level option is specified.
+
+	   main
+	   high
+       gpb 1: GPB (generalized P/B frame)
+
+	   0: regular P frame.
+
+       tile_cols
+	   Number of columns for tiled encoding.
+
+       tile_rows
+	   Number of rows for tiled encoding.
+
+       aud Insert the Access Unit Delimiter NAL.
+
+       pic_timing_sei
+	   Insert picture timing SEI with pic_struct_syntax element.
+
+       transform_skip
+	   Turn this option ON to enable transformskip. It is supported on
+	   platform equal or newer than ICL.
+
+       int_ref_type
+	   Specifies intra refresh type. The major goal of intra refresh is
+	   improvement of error resilience without significant impact on
+	   encoded bitstream size caused by I frames. The SDK encoder achieves
+	   this by encoding part of each frame in refresh cycle using intra
+	   MBs. none means no refresh. vertical means vertical refresh, by
+	   column of MBs. horizontal means horizontal refresh, by rows of MBs.
+	   slice means horizontal refresh by slices without overlapping. In
+	   case of slice, in_ref_cycle_size is ignored. To enable intra
+	   refresh, B frame should be set to 0.
+
+       int_ref_cycle_size
+	   Specifies number of pictures within refresh cycle starting from 2.
+	   0 and 1 are invalid values.
+
+       int_ref_qp_delta
+	   Specifies QP difference for inserted intra MBs. This is signed
+	   value in [-51, 51] range if target encoding bit-depth for luma
+	   samples is 8 and this range is [-63, 63] for 10 bit-depth or [-75,
+	   75] for 12 bit-depth respectively.
+
+       int_ref_cycle_dist
+	   Distance between the beginnings of the intra-refresh cycles in
+	   frames.
+
+       max_qp_i
+	   Maximum video quantizer scale for I frame.
+
+       min_qp_i
+	   Minimum video quantizer scale for I frame.
+
+       max_qp_p
+	   Maximum video quantizer scale for P frame.
+
+       min_qp_p
+	   Minimum video quantizer scale for P frame.
+
+       max_qp_b
+	   Maximum video quantizer scale for B frame.
+
+       min_qp_b
+	   Minimum video quantizer scale for B frame.
+
+       scenario
+	   Provides a hint to encoder about the scenario for the encoding
+	   session.
+
+	   unknown
+	   displayremoting
+	   videoconference
+	   archive
+	   livestreaming
+	   cameracapture
+	   videosurveillance
+	   gamestreaming
+	   remotegaming
+       avbr_accuracy
+	   Accuracy of the AVBR ratecontrol (unit of tenth of percent).
+
+       avbr_convergence
+	   Convergence of the AVBR ratecontrol (unit of 100 frames)
+
+	   The parameters avbr_accuracy and avbr_convergence are for the
+	   average variable bitrate control (AVBR) algorithm.  The algorithm
+	   focuses on overall encoding quality while meeting the specified
+	   bitrate, target_bitrate, within the accuracy range avbr_accuracy,
+	   after a avbr_Convergence period. This method does not follow HRD
+	   and the instant bitrate is not capped or padded.
+
+       skip_frame
+	   Use per-frame metadata "qsv_skip_frame" to skip frame when
+	   encoding. This option defines the usage of this metadata.
+
+	   no_skip
+	       Frame skipping is disabled.
+
+	   insert_dummy
+	       Encoder inserts into bitstream frame where all macroblocks are
+	       encoded as skipped.
+
+	   insert_nothing
+	       Similar to insert_dummy, but encoder inserts nothing into
+	       bitstream. The skipped frames are still used in brc. For
+	       example, gop still include skipped frames, and the frames after
+	       skipped frames will be larger in size.
+
+	   brc_only
+	       skip_frame metadata indicates the number of missed frames
+	       before the current frame.
+
+       MPEG2 Options
+
+       These options are used by mpeg2_qsv
+
+       profile
+	   unknown
+	   simple
+	   main
+	   high
+
+       VP9 Options
+
+       These options are used by vp9_qsv
+
+       profile
+	   unknown
+	   profile0
+	   profile1
+	   profile2
+	   profile3
+       tile_cols
+	   Number of columns for tiled encoding (requires libmfx >= 1.29).
+
+       tile_rows
+	   Number of rows for tiled encoding (requires libmfx  >= 1.29).
+
+       AV1 Options
+
+       These options are used by av1_qsv (requires libvpl).
+
+       profile
+	   unknown
+	   main
+       tile_cols
+	   Number of columns for tiled encoding.
+
+       tile_rows
+	   Number of rows for tiled encoding.
+
+       adaptive_i
+	   This flag controls insertion of I frames by the QSV encoder. Turn
+	   ON this flag to allow changing of frame type from P and B to I.
+
+       adaptive_b
+	   This flag controls changing of frame type from B to P.
+
+       b_strategy
+	   This option controls usage of B frames as reference.
+
+       extbrc
+	   Extended bitrate control.
+
+       look_ahead_depth
+	   Depth of look ahead in number frames, available when extbrc option
+	   is enabled.
+
+       low_delay_brc
+	   Setting this flag turns on or off LowDelayBRC feautre in qsv
+	   plugin, which provides more accurate bitrate control to minimize
+	   the variance of bitstream size frame by frame. Value: -1-default
+	   0-off 1-on
+
+       max_frame_size
+	   Set the allowed max size in bytes for each frame. If the frame size
+	   exceeds the limitation, encoder will adjust the QP value to control
+	   the frame size.  Invalid in CQP rate control mode.
+
+   snow
+       Options
+
+       iterative_dia_size
+	   dia size for the iterative motion estimation
+
+   VAAPI encoders
+       Wrappers for hardware encoders accessible via VAAPI.
+
+       These encoders only accept input in VAAPI hardware surfaces.  If you
+       have input in software frames, use the hwupload filter to upload them
+       to the GPU.
+
+       The following standard libavcodec options are used:
+
+       o   g / gop_size
+
+       o   bf / max_b_frames
+
+       o   profile
+
+	   If not set, this will be determined automatically from the format
+	   of the input frames and the profiles supported by the driver.
+
+       o   level
+
+       o   b / bit_rate
+
+       o   maxrate / rc_max_rate
+
+       o   bufsize / rc_buffer_size
+
+       o   rc_init_occupancy / rc_initial_buffer_occupancy
+
+       o   compression_level
+
+	   Speed / quality tradeoff: higher values are faster / worse quality.
+
+       o   q / global_quality
+
+	   Size / quality tradeoff: higher values are smaller / worse quality.
+
+       o   qmin
+
+       o   qmax
+
+       o   i_qfactor / i_quant_factor
+
+       o   i_qoffset / i_quant_offset
+
+       o   b_qfactor / b_quant_factor
+
+       o   b_qoffset / b_quant_offset
+
+       o   slices
+
+       All encoders support the following options:
+
+       low_power
+	   Some drivers/platforms offer a second encoder for some codecs
+	   intended to use less power than the default encoder; setting this
+	   option will attempt to use that encoder.  Note that it may support
+	   a reduced feature set, so some other options may not be available
+	   in this mode.
+
+       idr_interval
+	   Set the number of normal intra frames between full-refresh (IDR)
+	   frames in open-GOP mode.  The intra frames are still IRAPs, but
+	   will not include global headers and may have non-decodable leading
+	   pictures.
+
+       b_depth
+	   Set the B-frame reference depth.  When set to one (the default),
+	   all B-frames will refer only to P- or I-frames.  When set to
+	   greater values multiple layers of B-frames will be present, frames
+	   in each layer only referring to frames in higher layers.
+
+       async_depth
+	   Maximum processing parallelism. Increase this to improve single
+	   channel performance. This option doesn't work if driver doesn't
+	   implement vaSyncBuffer function. Please make sure there are enough
+	   hw_frames allocated if a large number of async_depth is used.
+
+       max_frame_size
+	   Set the allowed max size in bytes for each frame. If the frame size
+	   exceeds the limitation, encoder will adjust the QP value to control
+	   the frame size.  Invalid in CQP rate control mode.
+
+       rc_mode
+	   Set the rate control mode to use.  A given driver may only support
+	   a subset of modes.
+
+	   Possible modes:
+
+	   auto
+	       Choose the mode automatically based on driver support and the
+	       other options.  This is the default.
+
+	   CQP Constant-quality.
+
+	   CBR Constant-bitrate.
+
+	   VBR Variable-bitrate.
+
+	   ICQ Intelligent constant-quality.
+
+	   QVBR
+	       Quality-defined variable-bitrate.
+
+	   AVBR
+	       Average variable bitrate.
+
+       blbrc
+	   Enable block level rate control, which assigns different bitrate
+	   block by block.  Invalid for CQP mode.
+
+       Each encoder also has its own specific options:
+
+       av1_vaapi
+	   profile sets the value of seq_profile.  tier sets the value of
+	   seq_tier.  level sets the value of seq_level_idx.
+
+	   tiles
+	       Set the number of tiles to encode the input video with, as
+	       columns x rows.	(default is auto, which means use minimal tile
+	       column/row number).
+
+	   tile_groups
+	       Set tile groups number. All the tiles will be distributed as
+	       evenly as possible to each tile group. (default is 1).
+
+       h264_vaapi
+	   profile sets the value of profile_idc and the
+	   constraint_set*_flags.  level sets the value of level_idc.
+
+	   coder
+	       Set entropy encoder (default is cabac).	Possible values:
+
+	       ac
+	       cabac
+		   Use CABAC.
+
+	       vlc
+	       cavlc
+		   Use CAVLC.
+
+	   aud Include access unit delimiters in the stream (not included by
+	       default).
+
+	   sei Set SEI message types to include.  Some combination of the
+	       following values:
+
+	       identifier
+		   Include a user_data_unregistered message containing
+		   information about the encoder.
+
+	       timing
+		   Include picture timing parameters (buffering_period and
+		   pic_timing messages).
+
+	       recovery_point
+		   Include recovery points where appropriate (recovery_point
+		   messages).
+
+       hevc_vaapi
+	   profile and level set the values of general_profile_idc and
+	   general_level_idc respectively.
+
+	   aud Include access unit delimiters in the stream (not included by
+	       default).
+
+	   tier
+	       Set general_tier_flag.  This may affect the level chosen for
+	       the stream if it is not explicitly specified.
+
+	   sei Set SEI message types to include.  Some combination of the
+	       following values:
+
+	       hdr Include HDR metadata if the input frames have it
+		   (mastering_display_colour_volume and content_light_level
+		   messages).
+
+	   tiles
+	       Set the number of tiles to encode the input video with, as
+	       columns x rows.	Larger numbers allow greater parallelism in
+	       both encoding and decoding, but may decrease coding efficiency.
+
+       mjpeg_vaapi
+	   Only baseline DCT encoding is supported.  The encoder always uses
+	   the standard quantisation and huffman tables - global_quality
+	   scales the standard quantisation table (range 1-100).
+
+	   For YUV, 4:2:0, 4:2:2 and 4:4:4 subsampling modes are supported.
+	   RGB is also supported, and will create an RGB JPEG.
+
+	   jfif
+	       Include JFIF header in each frame (not included by default).
+
+	   huffman
+	       Include standard huffman tables (on by default).  Turning this
+	       off will save a few hundred bytes in each output frame, but may
+	       lose compatibility with some JPEG decoders which don't fully
+	       handle MJPEG.
+
+       mpeg2_vaapi
+	   profile and level set the value of profile_and_level_indication.
+
+       vp8_vaapi
+	   B-frames are not supported.
+
+	   global_quality sets the q_idx used for non-key frames (range
+	   0-127).
+
+	   loop_filter_level
+	   loop_filter_sharpness
+	       Manually set the loop filter parameters.
+
+       vp9_vaapi
+	   global_quality sets the q_idx used for P-frames (range 0-255).
+
+	   loop_filter_level
+	   loop_filter_sharpness
+	       Manually set the loop filter parameters.
+
+	   B-frames are supported, but the output stream is always in encode
+	   order rather than display order.  If B-frames are enabled, it may
+	   be necessary to use the vp9_raw_reorder bitstream filter to modify
+	   the output stream to display frames in the correct order.
+
+	   Only normal frames are produced - the vp9_superframe bitstream
+	   filter may be required to produce a stream usable with all
+	   decoders.
+
+   vbn
+       Vizrt Binary Image encoder.
+
+       This format is used by the broadcast vendor Vizrt for quick texture
+       streaming.  Advanced features of the format such as LZW compression of
+       texture data or generation of mipmaps are not supported.
+
+       Options
+
+       format string
+	   Sets the texture compression used by the VBN file. Can be dxt1,
+	   dxt5 or raw. Default is dxt5.
+
+   vc2
+       SMPTE VC-2 (previously BBC Dirac Pro). This codec was primarily aimed
+       at professional broadcasting but since it supports yuv420, yuv422 and
+       yuv444 at 8 (limited range or full range), 10 or 12 bits, this makes it
+       suitable for other tasks which require low overhead and low compression
+       (like screen recording).
+
+       Options
+
+       b   Sets target video bitrate. Usually that's around 1:6 of the
+	   uncompressed video bitrate (e.g. for 1920x1080 50fps yuv422p10
+	   that's around 400Mbps). Higher values (close to the uncompressed
+	   bitrate) turn on lossless compression mode.
+
+       field_order
+	   Enables field coding when set (e.g. to tt - top field first) for
+	   interlaced inputs. Should increase compression with interlaced
+	   content as it splits the fields and encodes each separately.
+
+       wavelet_depth
+	   Sets the total amount of wavelet transforms to apply, between 1 and
+	   5 (default).  Lower values reduce compression and quality. Less
+	   capable decoders may not be able to handle values of wavelet_depth
+	   over 3.
+
+       wavelet_type
+	   Sets the transform type. Currently only 5_3 (LeGall) and 9_7
+	   (Deslauriers-Dubuc) are implemented, with 9_7 being the one with
+	   better compression and thus is the default.
+
+       slice_width
+       slice_height
+	   Sets the slice size for each slice. Larger values result in better
+	   compression.  For compatibility with other more limited decoders
+	   use slice_width of 32 and slice_height of 8.
+
+       tolerance
+	   Sets the undershoot tolerance of the rate control system in
+	   percent. This is to prevent an expensive search from being run.
+
+       qm  Sets the quantization matrix preset to use by default or when
+	   wavelet_depth is set to 5
+
+	   -   default Uses the default quantization matrix from the
+	       specifications, extended with values for the fifth level. This
+	       provides a good balance between keeping detail and omitting
+	       artifacts.
+
+	   -   flat Use a completely zeroed out quantization matrix. This
+	       increases PSNR but might reduce perception. Use in bogus
+	       benchmarks.
+
+	   -   color Reduces detail but attempts to preserve color at
+	       extremely low bitrates.
+
+SUBTITLES ENCODERS
+   dvdsub
+       This codec encodes the bitmap subtitle format that is used in DVDs.
+       Typically they are stored in VOBSUB file pairs (*.idx + *.sub), and
+       they can also be used in Matroska files.
+
+       Options
+
+       palette
+	   Specify the global palette used by the bitmaps.
+
+	   The format for this option is a string containing 16 24-bits
+	   hexadecimal numbers (without 0x prefix) separated by commas, for
+	   example "0d00ee, ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b,
+	   0d617a, 7b7b7b, d1d1d1, 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c,
+	   7c127b".
+
+       even_rows_fix
+	   When set to 1, enable a work-around that makes the number of pixel
+	   rows even in all subtitles.	This fixes a problem with some players
+	   that cut off the bottom row if the number is odd.  The work-around
+	   just adds a fully transparent row if needed.  The overhead is low,
+	   typically one byte per subtitle on average.
+
+	   By default, this work-around is disabled.
+
+BITSTREAM FILTERS
+       When you configure your FFmpeg build, all the supported bitstream
+       filters are enabled by default. You can list all available ones using
+       the configure option "--list-bsfs".
+
+       You can disable all the bitstream filters using the configure option
+       "--disable-bsfs", and selectively enable any bitstream filter using the
+       option "--enable-bsf=BSF", or you can disable a particular bitstream
+       filter using the option "--disable-bsf=BSF".
+
+       The option "-bsfs" of the ff* tools will display the list of all the
+       supported bitstream filters included in your build.
+
+       The ff* tools have a -bsf option applied per stream, taking a comma-
+       separated list of filters, whose parameters follow the filter name
+       after a '='.
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT
+
+       Below is a description of the currently available bitstream filters,
+       with their parameters, if any.
+
+   aac_adtstoasc
+       Convert MPEG-2/4 AAC ADTS to an MPEG-4 Audio Specific Configuration
+       bitstream.
+
+       This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4 ADTS
+       header and removes the ADTS header.
+
+       This filter is required for example when copying an AAC stream from a
+       raw ADTS AAC or an MPEG-TS container to MP4A-LATM, to an FLV file, or
+       to MOV/MP4 files and related formats such as 3GP or M4A. Please note
+       that it is auto-inserted for MP4A-LATM and MOV/MP4 and related formats.
+
+   av1_metadata
+       Modify metadata embedded in an AV1 stream.
+
+       td  Insert or remove temporal delimiter OBUs in all temporal units of
+	   the stream.
+
+	   insert
+	       Insert a TD at the beginning of every TU which does not already
+	       have one.
+
+	   remove
+	       Remove the TD from the beginning of every TU which has one.
+
+       color_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the color description fields in the stream (see AV1 section
+	   6.4.2).
+
+       color_range
+	   Set the color range in the stream (see AV1 section 6.4.2; note that
+	   this cannot be set for streams using BT.709 primaries, sRGB
+	   transfer characteristic and identity (RGB) matrix coefficients).
+
+	   tv  Limited range.
+
+	   pc  Full range.
+
+       chroma_sample_position
+	   Set the chroma sample location in the stream (see AV1 section
+	   6.4.2).  This can only be set for 4:2:0 streams.
+
+	   vertical
+	       Left position (matching the default in MPEG-2 and H.264).
+
+	   colocated
+	       Top-left position.
+
+       tick_rate
+	   Set the tick rate (time_scale / num_units_in_display_tick) in the
+	   timing info in the sequence header.
+
+       num_ticks_per_picture
+	   Set the number of ticks in each picture, to indicate that the
+	   stream has a fixed framerate.  Ignored if tick_rate is not also
+	   set.
+
+       delete_padding
+	   Deletes Padding OBUs.
+
+   chomp
+       Remove zero padding at the end of a packet.
+
+   dca_core
+       Extract the core from a DCA/DTS stream, dropping extensions such as
+       DTS-HD.
+
+   dump_extra
+       Add extradata to the beginning of the filtered packets except when said
+       packets already exactly begin with the extradata that is intended to be
+       added.
+
+       freq
+	   The additional argument specifies which packets should be filtered.
+	   It accepts the values:
+
+	   k
+	   keyframe
+	       add extradata to all key packets
+
+	   e
+	   all add extradata to all packets
+
+       If not specified it is assumed k.
+
+       For example the following ffmpeg command forces a global header (thus
+       disabling individual packet headers) in the H.264 packets generated by
+       the "libx264" encoder, but corrects them by adding the header stored in
+       extradata to the key packets:
+
+	       ffmpeg -i INPUT -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra out.ts
+
+   dv_error_marker
+       Blocks in DV which are marked as damaged are replaced by blocks of the
+       specified color.
+
+       color
+	   The color to replace damaged blocks by
+
+       sta A 16 bit mask which specifies which of the 16 possible error status
+	   values are to be replaced by colored blocks. 0xFFFE is the default
+	   which replaces all non 0 error status values.
+
+	   ok  No error, no concealment
+
+	   err Error, No concealment
+
+	   res Reserved
+
+	   notok
+	       Error or concealment
+
+	   notres
+	       Not reserved
+
+	   Aa, Ba, Ca, Ab, Bb, Cb, A, B, C, a, b, erri, erru
+	       The specific error status code
+
+	   see page 44-46 or section 5.5 of
+	   <http://web.archive.org/web/20060927044735/http://www.smpte.org/smpte_store/standards/pdf/s314m.pdf>
+
+   eac3_core
+       Extract the core from a E-AC-3 stream, dropping extra channels.
+
+   extract_extradata
+       Extract the in-band extradata.
+
+       Certain codecs allow the long-term headers (e.g. MPEG-2 sequence
+       headers, or H.264/HEVC (VPS/)SPS/PPS) to be transmitted either "in-
+       band" (i.e. as a part of the bitstream containing the coded frames) or
+       "out of band" (e.g. on the container level). This latter form is called
+       "extradata" in FFmpeg terminology.
+
+       This bitstream filter detects the in-band headers and makes them
+       available as extradata.
+
+       remove
+	   When this option is enabled, the long-term headers are removed from
+	   the bitstream after extraction.
+
+   filter_units
+       Remove units with types in or not in a given set from the stream.
+
+       pass_types
+	   List of unit types or ranges of unit types to pass through while
+	   removing all others.  This is specified as a '|'-separated list of
+	   unit type values or ranges of values with '-'.
+
+       remove_types
+	   Identical to pass_types, except the units in the given set removed
+	   and all others passed through.
+
+       The types used by pass_types and remove_types correspond to NAL unit
+       types (nal_unit_type) in H.264, HEVC and H.266 (see Table 7-1 in the
+       H.264 and HEVC specifications or Table 5 in the H.266 specification),
+       to marker values for JPEG (without 0xFF prefix) and to start codes
+       without start code prefix (i.e. the byte following the 0x000001) for
+       MPEG-2.	For VP8 and VP9, every unit has type zero.
+
+       Extradata is unchanged by this transformation, but note that if the
+       stream contains inline parameter sets then the output may be unusable
+       if they are removed.
+
+       For example, to remove all non-VCL NAL units from an H.264 stream:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=pass_types=1-5' OUTPUT
+
+       To remove all AUDs, SEI and filler from an H.265 stream:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT
+
+       To remove all user data from a MPEG-2 stream, including Closed
+       Captions:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=178' OUTPUT
+
+       To remove all SEI from a H264 stream, including Closed Captions:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=6' OUTPUT
+
+       To remove all prefix and suffix SEI from a HEVC stream, including
+       Closed Captions and dynamic HDR:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=39|40' OUTPUT
+
+   hapqa_extract
+       Extract Rgb or Alpha part of an HAPQA file, without recompression, in
+       order to create an HAPQ or an HAPAlphaOnly file.
+
+       texture
+	   Specifies the texture to keep.
+
+	   color
+	   alpha
+
+       Convert HAPQA to HAPQ
+
+	       ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=color -tag:v HapY -metadata:s:v:0 encoder="HAPQ" hapq_file.mov
+
+       Convert HAPQA to HAPAlphaOnly
+
+	       ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=alpha -tag:v HapA -metadata:s:v:0 encoder="HAPAlpha Only" hapalphaonly_file.mov
+
+   h264_metadata
+       Modify metadata embedded in an H.264 stream.
+
+       aud Insert or remove AUD NAL units in all access units of the stream.
+
+	   pass
+	   insert
+	   remove
+
+	   Default is pass.
+
+       sample_aspect_ratio
+	   Set the sample aspect ratio of the stream in the VUI parameters.
+	   See H.264 table E-1.
+
+       overscan_appropriate_flag
+	   Set whether the stream is suitable for display using overscan or
+	   not (see H.264 section E.2.1).
+
+       video_format
+       video_full_range_flag
+	   Set the video format in the stream (see H.264 section E.2.1 and
+	   table E-2).
+
+       colour_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the colour description in the stream (see H.264 section E.2.1
+	   and tables E-3, E-4 and E-5).
+
+       chroma_sample_loc_type
+	   Set the chroma sample location in the stream (see H.264 section
+	   E.2.1 and figure E-1).
+
+       tick_rate
+	   Set the tick rate (time_scale / num_units_in_tick) in the VUI
+	   parameters.	This is the smallest time unit representable in the
+	   stream, and in many cases represents the field rate of the stream
+	   (double the frame rate).
+
+       fixed_frame_rate_flag
+	   Set whether the stream has fixed framerate - typically this
+	   indicates that the framerate is exactly half the tick rate, but the
+	   exact meaning is dependent on interlacing and the picture structure
+	   (see H.264 section E.2.1 and table E-6).
+
+       zero_new_constraint_set_flags
+	   Zero constraint_set4_flag and constraint_set5_flag in the SPS.
+	   These bits were reserved in a previous version of the H.264 spec,
+	   and thus some hardware decoders require these to be zero. The
+	   result of zeroing this is still a valid bitstream.
+
+       crop_left
+       crop_right
+       crop_top
+       crop_bottom
+	   Set the frame cropping offsets in the SPS.  These values will
+	   replace the current ones if the stream is already cropped.
+
+	   These fields are set in pixels.  Note that some sizes may not be
+	   representable if the chroma is subsampled or the stream is
+	   interlaced (see H.264 section 7.4.2.1.1).
+
+       sei_user_data
+	   Insert a string as SEI unregistered user data.  The argument must
+	   be of the form UUID+string, where the UUID is as hex digits
+	   possibly separated by hyphens, and the string can be anything.
+
+	   For example, 086f3693-b7b3-4f2c-9653-21492feee5b8+hello will insert
+	   the string ``hello'' associated with the given UUID.
+
+       delete_filler
+	   Deletes both filler NAL units and filler SEI messages.
+
+       display_orientation
+	   Insert, extract or remove Display orientation SEI messages.	See
+	   H.264 section D.1.27 and D.2.27 for syntax and semantics.
+
+	   pass
+	   insert
+	   remove
+	   extract
+
+	   Default is pass.
+
+	   Insert mode works in conjunction with "rotate" and "flip" options.
+	   Any pre-existing Display orientation messages will be removed in
+	   insert or remove mode.  Extract mode attaches the display matrix to
+	   the packet as side data.
+
+       rotate
+	   Set rotation in display orientation SEI (anticlockwise angle in
+	   degrees).  Range is -360 to +360. Default is NaN.
+
+       flip
+	   Set flip in display orientation SEI.
+
+	   horizontal
+	   vertical
+
+	   Default is unset.
+
+       level
+	   Set the level in the SPS.  Refer to H.264 section A.3 and tables
+	   A-1 to A-5.
+
+	   The argument must be the name of a level (for example, 4.2), a
+	   level_idc value (for example, 42), or the special name auto
+	   indicating that the filter should attempt to guess the level from
+	   the input stream properties.
+
+   h264_mp4toannexb
+       Convert an H.264 bitstream from length prefixed mode to start code
+       prefixed mode (as defined in the Annex B of the ITU-T H.264
+       specification).
+
+       This is required by some streaming formats, typically the MPEG-2
+       transport stream format (muxer "mpegts").
+
+       For example to remux an MP4 file containing an H.264 stream to mpegts
+       format with ffmpeg, you can use the command:
+
+	       ffmpeg -i INPUT.mp4 -codec copy -bsf:v h264_mp4toannexb OUTPUT.ts
+
+       Please note that this filter is auto-inserted for MPEG-TS (muxer
+       "mpegts") and raw H.264 (muxer "h264") output formats.
+
+   h264_redundant_pps
+       This applies a specific fixup to some Blu-ray streams which contain
+       redundant PPSs modifying irrelevant parameters of the stream which
+       confuse other transformations which require correct extradata.
+
+   hevc_metadata
+       Modify metadata embedded in an HEVC stream.
+
+       aud Insert or remove AUD NAL units in all access units of the stream.
+
+	   insert
+	   remove
+       sample_aspect_ratio
+	   Set the sample aspect ratio in the stream in the VUI parameters.
+
+       video_format
+       video_full_range_flag
+	   Set the video format in the stream (see H.265 section E.3.1 and
+	   table E.2).
+
+       colour_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the colour description in the stream (see H.265 section E.3.1
+	   and tables E.3, E.4 and E.5).
+
+       chroma_sample_loc_type
+	   Set the chroma sample location in the stream (see H.265 section
+	   E.3.1 and figure E.1).
+
+       tick_rate
+	   Set the tick rate in the VPS and VUI parameters (time_scale /
+	   num_units_in_tick). Combined with num_ticks_poc_diff_one, this can
+	   set a constant framerate in the stream.  Note that it is likely to
+	   be overridden by container parameters when the stream is in a
+	   container.
+
+       num_ticks_poc_diff_one
+	   Set poc_proportional_to_timing_flag in VPS and VUI and use this
+	   value to set num_ticks_poc_diff_one_minus1 (see H.265 sections
+	   7.4.3.1 and E.3.1).	Ignored if tick_rate is not also set.
+
+       crop_left
+       crop_right
+       crop_top
+       crop_bottom
+	   Set the conformance window cropping offsets in the SPS.  These
+	   values will replace the current ones if the stream is already
+	   cropped.
+
+	   These fields are set in pixels.  Note that some sizes may not be
+	   representable if the chroma is subsampled (H.265 section
+	   7.4.3.2.1).
+
+       level
+	   Set the level in the VPS and SPS.  See H.265 section A.4 and tables
+	   A.6 and A.7.
+
+	   The argument must be the name of a level (for example, 5.1), a
+	   general_level_idc value (for example, 153 for level 5.1), or the
+	   special name auto indicating that the filter should attempt to
+	   guess the level from the input stream properties.
+
+   hevc_mp4toannexb
+       Convert an HEVC/H.265 bitstream from length prefixed mode to start code
+       prefixed mode (as defined in the Annex B of the ITU-T H.265
+       specification).
+
+       This is required by some streaming formats, typically the MPEG-2
+       transport stream format (muxer "mpegts").
+
+       For example to remux an MP4 file containing an HEVC stream to mpegts
+       format with ffmpeg, you can use the command:
+
+	       ffmpeg -i INPUT.mp4 -codec copy -bsf:v hevc_mp4toannexb OUTPUT.ts
+
+       Please note that this filter is auto-inserted for MPEG-TS (muxer
+       "mpegts") and raw HEVC/H.265 (muxer "h265" or "hevc") output formats.
+
+   imxdump
+       Modifies the bitstream to fit in MOV and to be usable by the Final Cut
+       Pro decoder. This filter only applies to the mpeg2video codec, and is
+       likely not needed for Final Cut Pro 7 and newer with the appropriate
+       -tag:v.
+
+       For example, to remux 30 MB/sec NTSC IMX to MOV:
+
+	       ffmpeg -i input.mxf -c copy -bsf:v imxdump -tag:v mx3n output.mov
+
+   mjpeg2jpeg
+       Convert MJPEG/AVI1 packets to full JPEG/JFIF packets.
+
+       MJPEG is a video codec wherein each video frame is essentially a JPEG
+       image. The individual frames can be extracted without loss, e.g. by
+
+	       ffmpeg -i ../some_mjpeg.avi -c:v copy frames_%d.jpg
+
+       Unfortunately, these chunks are incomplete JPEG images, because they
+       lack the DHT segment required for decoding. Quoting from
+       <http://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml>:
+
+       Avery Lee, writing in the rec.video.desktop newsgroup in 2001,
+       commented that "MJPEG, or at least the MJPEG in AVIs having the MJPG
+       fourcc, is restricted JPEG with a fixed -- and *omitted* -- Huffman
+       table. The JPEG must be YCbCr colorspace, it must be 4:2:2, and it must
+       use basic Huffman encoding, not arithmetic or progressive. . . . You
+       can indeed extract the MJPEG frames and decode them with a regular JPEG
+       decoder, but you have to prepend the DHT segment to them, or else the
+       decoder won't have any idea how to decompress the data. The exact table
+       necessary is given in the OpenDML spec."
+
+       This bitstream filter patches the header of frames extracted from an
+       MJPEG stream (carrying the AVI1 header ID and lacking a DHT segment) to
+       produce fully qualified JPEG images.
+
+	       ffmpeg -i mjpeg-movie.avi -c:v copy -bsf:v mjpeg2jpeg frame_%d.jpg
+	       exiftran -i -9 frame*.jpg
+	       ffmpeg -i frame_%d.jpg -c:v copy rotated.avi
+
+   mjpegadump
+       Add an MJPEG A header to the bitstream, to enable decoding by
+       Quicktime.
+
+   mov2textsub
+       Extract a representable text file from MOV subtitles, stripping the
+       metadata header from each subtitle packet.
+
+       See also the text2movsub filter.
+
+   mpeg2_metadata
+       Modify metadata embedded in an MPEG-2 stream.
+
+       display_aspect_ratio
+	   Set the display aspect ratio in the stream.
+
+	   The following fixed values are supported:
+
+	   4/3
+	   16/9
+	   221/100
+
+	   Any other value will result in square pixels being signalled
+	   instead (see H.262 section 6.3.3 and table 6-3).
+
+       frame_rate
+	   Set the frame rate in the stream.  This is constructed from a table
+	   of known values combined with a small multiplier and divisor - if
+	   the supplied value is not exactly representable, the nearest
+	   representable value will be used instead (see H.262 section 6.3.3
+	   and table 6-4).
+
+       video_format
+	   Set the video format in the stream (see H.262 section 6.3.6 and
+	   table 6-6).
+
+       colour_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the colour description in the stream (see H.262 section 6.3.6
+	   and tables 6-7, 6-8 and 6-9).
+
+   mpeg4_unpack_bframes
+       Unpack DivX-style packed B-frames.
+
+       DivX-style packed B-frames are not valid MPEG-4 and were only a
+       workaround for the broken Video for Windows subsystem.  They use more
+       space, can cause minor AV sync issues, require more CPU power to decode
+       (unless the player has some decoded picture queue to compensate the
+       2,0,2,0 frame per packet style) and cause trouble if copied into a
+       standard container like mp4 or mpeg-ps/ts, because MPEG-4 decoders may
+       not be able to decode them, since they are not valid MPEG-4.
+
+       For example to fix an AVI file containing an MPEG-4 stream with DivX-
+       style packed B-frames using ffmpeg, you can use the command:
+
+	       ffmpeg -i INPUT.avi -codec copy -bsf:v mpeg4_unpack_bframes OUTPUT.avi
+
+   noise
+       Damages the contents of packets or simply drops them without damaging
+       the container. Can be used for fuzzing or testing error
+       resilience/concealment.
+
+       Parameters:
+
+       amount
+	   Accepts an expression whose evaluation per-packet determines how
+	   often bytes in that packet will be modified. A value below 0 will
+	   result in a variable frequency.  Default is 0 which results in no
+	   modification. However, if neither amount nor drop is specified,
+	   amount will be set to -1. See below for accepted variables.
+
+       drop
+	   Accepts an expression evaluated per-packet whose value determines
+	   whether that packet is dropped.  Evaluation to a positive value
+	   results in the packet being dropped. Evaluation to a negative value
+	   results in a variable chance of it being dropped, roughly inverse
+	   in proportion to the magnitude of the value. Default is 0 which
+	   results in no drops. See below for accepted variables.
+
+       dropamount
+	   Accepts a non-negative integer, which assigns a variable chance of
+	   it being dropped, roughly inverse in proportion to the value.
+	   Default is 0 which results in no drops. This option is kept for
+	   backwards compatibility and is equivalent to setting drop to a
+	   negative value with the same magnitude i.e. "dropamount=4" is the
+	   same as "drop=-4". Ignored if drop is also specified.
+
+       Both "amount" and "drop" accept expressions containing the following
+       variables:
+
+       n   The index of the packet, starting from zero.
+
+       tb  The timebase for packet timestamps.
+
+       pts Packet presentation timestamp.
+
+       dts Packet decoding timestamp.
+
+       nopts
+	   Constant representing AV_NOPTS_VALUE.
+
+       startpts
+	   First non-AV_NOPTS_VALUE PTS seen in the stream.
+
+       startdts
+	   First non-AV_NOPTS_VALUE DTS seen in the stream.
+
+       duration
+       d   Packet duration, in timebase units.
+
+       pos Packet position in input; may be -1 when unknown or not set.
+
+       size
+	   Packet size, in bytes.
+
+       key Whether packet is marked as a keyframe.
+
+       state
+	   A pseudo random integer, primarily derived from the content of
+	   packet payload.
+
+       Examples
+
+       Apply modification to every byte but don't drop any packets.
+
+	       ffmpeg -i INPUT -c copy -bsf noise=1 output.mkv
+
+       Drop every video packet not marked as a keyframe after timestamp 30s
+       but do not modify any of the remaining packets.
+
+	       ffmpeg -i INPUT -c copy -bsf:v noise=drop='gt(t\,30)*not(key)' output.mkv
+
+       Drop one second of audio every 10 seconds and add some random noise to
+       the rest.
+
+	       ffmpeg -i INPUT -c copy -bsf:a noise=amount=-1:drop='between(mod(t\,10)\,9\,10)' output.mkv
+
+   null
+       This bitstream filter passes the packets through unchanged.
+
+   pcm_rechunk
+       Repacketize PCM audio to a fixed number of samples per packet or a
+       fixed packet rate per second. This is similar to the asetnsamples audio
+       filter but works on audio packets instead of audio frames.
+
+       nb_out_samples, n
+	   Set the number of samples per each output audio packet. The number
+	   is intended as the number of samples per each channel. Default
+	   value is 1024.
+
+       pad, p
+	   If set to 1, the filter will pad the last audio packet with
+	   silence, so that it will contain the same number of samples (or
+	   roughly the same number of samples, see frame_rate) as the previous
+	   ones. Default value is 1.
+
+       frame_rate, r
+	   This option makes the filter output a fixed number of packets per
+	   second instead of a fixed number of samples per packet. If the
+	   audio sample rate is not divisible by the frame rate then the
+	   number of samples will not be constant but will vary slightly so
+	   that each packet will start as close to the frame boundary as
+	   possible. Using this option has precedence over nb_out_samples.
+
+       You can generate the well known 1602-1601-1602-1601-1602 pattern of
+       48kHz audio for NTSC frame rate using the frame_rate option.
+
+	       ffmpeg -f lavfi -i sine=r=48000:d=1 -c pcm_s16le -bsf pcm_rechunk=r=30000/1001 -f framecrc -
+
+   pgs_frame_merge
+       Merge a sequence of PGS Subtitle segments ending with an "end of
+       display set" segment into a single packet.
+
+       This is required by some containers that support PGS subtitles (muxer
+       "matroska").
+
+   prores_metadata
+       Modify color property metadata embedded in prores stream.
+
+       color_primaries
+	   Set the color primaries.  Available values are:
+
+	   auto
+	       Keep the same color primaries property (default).
+
+	   unknown
+	   bt709
+	   bt470bg
+	       BT601 625
+
+	   smpte170m
+	       BT601 525
+
+	   bt2020
+	   smpte431
+	       DCI P3
+
+	   smpte432
+	       P3 D65
+
+       transfer_characteristics
+	   Set the color transfer.  Available values are:
+
+	   auto
+	       Keep the same transfer characteristics property (default).
+
+	   unknown
+	   bt709
+	       BT 601, BT 709, BT 2020
+
+	   smpte2084
+	       SMPTE ST 2084
+
+	   arib-std-b67
+	       ARIB STD-B67
+
+       matrix_coefficients
+	   Set the matrix coefficient.	Available values are:
+
+	   auto
+	       Keep the same colorspace property (default).
+
+	   unknown
+	   bt709
+	   smpte170m
+	       BT 601
+
+	   bt2020nc
+
+       Set Rec709 colorspace for each frame of the file
+
+	       ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709 output.mov
+
+       Set Hybrid Log-Gamma parameters for each frame of the file
+
+	       ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt2020:color_trc=arib-std-b67:colorspace=bt2020nc output.mov
+
+   remove_extra
+       Remove extradata from packets.
+
+       It accepts the following parameter:
+
+       freq
+	   Set which frame types to remove extradata from.
+
+	   k   Remove extradata from non-keyframes only.
+
+	   keyframe
+	       Remove extradata from keyframes only.
+
+	   e, all
+	       Remove extradata from all frames.
+
+   setts
+       Set PTS and DTS in packets.
+
+       It accepts the following parameters:
+
+       ts
+       pts
+       dts Set expressions for PTS, DTS or both.
+
+       duration
+	   Set expression for duration.
+
+       time_base
+	   Set output time base.
+
+       The expressions are evaluated through the eval API and can contain the
+       following constants:
+
+       N   The count of the input packet. Starting from 0.
+
+       TS  The demux timestamp in input in case of "ts" or "dts" option or
+	   presentation timestamp in case of "pts" option.
+
+       POS The original position in the file of the packet, or undefined if
+	   undefined for the current packet
+
+       DTS The demux timestamp in input.
+
+       PTS The presentation timestamp in input.
+
+       DURATION
+	   The duration in input.
+
+       STARTDTS
+	   The DTS of the first packet.
+
+       STARTPTS
+	   The PTS of the first packet.
+
+       PREV_INDTS
+	   The previous input DTS.
+
+       PREV_INPTS
+	   The previous input PTS.
+
+       PREV_INDURATION
+	   The previous input duration.
+
+       PREV_OUTDTS
+	   The previous output DTS.
+
+       PREV_OUTPTS
+	   The previous output PTS.
+
+       PREV_OUTDURATION
+	   The previous output duration.
+
+       NEXT_DTS
+	   The next input DTS.
+
+       NEXT_PTS
+	   The next input PTS.
+
+       NEXT_DURATION
+	   The next input duration.
+
+       TB  The timebase of stream packet belongs.
+
+       TB_OUT
+	   The output timebase.
+
+       SR  The sample rate of stream packet belongs.
+
+       NOPTS
+	   The AV_NOPTS_VALUE constant.
+
+       For example, to set PTS equal to DTS (not recommended if B-frames are
+       involved):
+
+	       ffmpeg -i INPUT -c:a copy -bsf:a setts=pts=DTS out.mkv
+
+   showinfo
+       Log basic packet information. Mainly useful for testing, debugging, and
+       development.
+
+   text2movsub
+       Convert text subtitles to MOV subtitles (as used by the "mov_text"
+       codec) with metadata headers.
+
+       See also the mov2textsub filter.
+
+   trace_headers
+       Log trace output containing all syntax elements in the coded stream
+       headers (everything above the level of individual coded blocks).  This
+       can be useful for debugging low-level stream issues.
+
+       Supports AV1, H.264, H.265, (M)JPEG, MPEG-2 and VP9, but depending on
+       the build only a subset of these may be available.
+
+   truehd_core
+       Extract the core from a TrueHD stream, dropping ATMOS data.
+
+   vp9_metadata
+       Modify metadata embedded in a VP9 stream.
+
+       color_space
+	   Set the color space value in the frame header.  Note that any frame
+	   set to RGB will be implicitly set to PC range and that RGB is
+	   incompatible with profiles 0 and 2.
+
+	   unknown
+	   bt601
+	   bt709
+	   smpte170
+	   smpte240
+	   bt2020
+	   rgb
+       color_range
+	   Set the color range value in the frame header.  Note that any value
+	   imposed by the color space will take precedence over this value.
+
+	   tv
+	   pc
+
+   vp9_superframe
+       Merge VP9 invisible (alt-ref) frames back into VP9 superframes. This
+       fixes merging of split/segmented VP9 streams where the alt-ref frame
+       was split from its visible counterpart.
+
+   vp9_superframe_split
+       Split VP9 superframes into single frames.
+
+   vp9_raw_reorder
+       Given a VP9 stream with correct timestamps but possibly out of order,
+       insert additional show-existing-frame packets to correct the ordering.
+
+FORMAT OPTIONS
+       The libavformat library provides some generic global options, which can
+       be set on all the muxers and demuxers. In addition each muxer or
+       demuxer may support so-called private options, which are specific for
+       that component.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the "AVFormatContext" options or
+       using the libavutil/opt.h API for programmatic use.
+
+       The list of supported options follows:
+
+       avioflags flags (input/output)
+	   Possible values:
+
+	   direct
+	       Reduce buffering.
+
+       probesize integer (input)
+	   Set probing size in bytes, i.e. the size of the data to analyze to
+	   get stream information. A higher value will enable detecting more
+	   information in case it is dispersed into the stream, but will
+	   increase latency. Must be an integer not lesser than 32. It is
+	   5000000 by default.
+
+       max_probe_packets integer (input)
+	   Set the maximum number of buffered packets when probing a codec.
+	   Default is 2500 packets.
+
+       packetsize integer (output)
+	   Set packet size.
+
+       fflags flags
+	   Set format flags. Some are implemented for a limited number of
+	   formats.
+
+	   Possible values for input files:
+
+	   discardcorrupt
+	       Discard corrupted packets.
+
+	   fastseek
+	       Enable fast, but inaccurate seeks for some formats.
+
+	   genpts
+	       Generate missing PTS if DTS is present.
+
+	   igndts
+	       Ignore DTS if PTS is also set. In case the PTS is set, the DTS
+	       value is set to NOPTS. This is ignored when the "nofillin" flag
+	       is set.
+
+	   ignidx
+	       Ignore index.
+
+	   nobuffer
+	       Reduce the latency introduced by buffering during initial input
+	       streams analysis.
+
+	   nofillin
+	       Do not fill in missing values in packet fields that can be
+	       exactly calculated.
+
+	   noparse
+	       Disable AVParsers, this needs "+nofillin" too.
+
+	   sortdts
+	       Try to interleave output packets by DTS. At present, available
+	       only for AVIs with an index.
+
+	   Possible values for output files:
+
+	   autobsf
+	       Automatically apply bitstream filters as required by the output
+	       format. Enabled by default.
+
+	   bitexact
+	       Only write platform-, build- and time-independent data.	This
+	       ensures that file and data checksums are reproducible and match
+	       between platforms. Its primary use is for regression testing.
+
+	   flush_packets
+	       Write out packets immediately.
+
+	   shortest
+	       Stop muxing at the end of the shortest stream.  It may be
+	       needed to increase max_interleave_delta to avoid flushing the
+	       longer streams before EOF.
+
+       seek2any integer (input)
+	   Allow seeking to non-keyframes on demuxer level when supported if
+	   set to 1.  Default is 0.
+
+       analyzeduration integer (input)
+	   Specify how many microseconds are analyzed to probe the input. A
+	   higher value will enable detecting more accurate information, but
+	   will increase latency. It defaults to 5,000,000 microseconds = 5
+	   seconds.
+
+       cryptokey hexadecimal string (input)
+	   Set decryption key.
+
+       indexmem integer (input)
+	   Set max memory used for timestamp index (per stream).
+
+       rtbufsize integer (input)
+	   Set max memory used for buffering real-time frames.
+
+       fdebug flags (input/output)
+	   Print specific debug info.
+
+	   Possible values:
+
+	   ts
+       max_delay integer (input/output)
+	   Set maximum muxing or demuxing delay in microseconds.
+
+       fpsprobesize integer (input)
+	   Set number of frames used to probe fps.
+
+       audio_preload integer (output)
+	   Set microseconds by which audio packets should be interleaved
+	   earlier.
+
+       chunk_duration integer (output)
+	   Set microseconds for each chunk.
+
+       chunk_size integer (output)
+	   Set size in bytes for each chunk.
+
+       err_detect, f_err_detect flags (input)
+	   Set error detection flags. "f_err_detect" is deprecated and should
+	   be used only via the ffmpeg tool.
+
+	   Possible values:
+
+	   crccheck
+	       Verify embedded CRCs.
+
+	   bitstream
+	       Detect bitstream specification deviations.
+
+	   buffer
+	       Detect improper bitstream length.
+
+	   explode
+	       Abort decoding on minor error detection.
+
+	   careful
+	       Consider things that violate the spec and have not been seen in
+	       the wild as errors.
+
+	   compliant
+	       Consider all spec non compliancies as errors.
+
+	   aggressive
+	       Consider things that a sane encoder should not do as an error.
+
+       max_interleave_delta integer (output)
+	   Set maximum buffering duration for interleaving. The duration is
+	   expressed in microseconds, and defaults to 10000000 (10 seconds).
+
+	   To ensure all the streams are interleaved correctly, libavformat
+	   will wait until it has at least one packet for each stream before
+	   actually writing any packets to the output file. When some streams
+	   are "sparse" (i.e. there are large gaps between successive
+	   packets), this can result in excessive buffering.
+
+	   This field specifies the maximum difference between the timestamps
+	   of the first and the last packet in the muxing queue, above which
+	   libavformat will output a packet regardless of whether it has
+	   queued a packet for all the streams.
+
+	   If set to 0, libavformat will continue buffering packets until it
+	   has a packet for each stream, regardless of the maximum timestamp
+	   difference between the buffered packets.
+
+       use_wallclock_as_timestamps integer (input)
+	   Use wallclock as timestamps if set to 1. Default is 0.
+
+       avoid_negative_ts integer (output)
+	   Possible values:
+
+	   make_non_negative
+	       Shift timestamps to make them non-negative.  Also note that
+	       this affects only leading negative timestamps, and not non-
+	       monotonic negative timestamps.
+
+	   make_zero
+	       Shift timestamps so that the first timestamp is 0.
+
+	   auto (default)
+	       Enables shifting when required by the target format.
+
+	   disabled
+	       Disables shifting of timestamp.
+
+	   When shifting is enabled, all output timestamps are shifted by the
+	   same amount. Audio, video, and subtitles desynching and relative
+	   timestamp differences are preserved compared to how they would have
+	   been without shifting.
+
+       skip_initial_bytes integer (input)
+	   Set number of bytes to skip before reading header and frames if set
+	   to 1.  Default is 0.
+
+       correct_ts_overflow integer (input)
+	   Correct single timestamp overflows if set to 1. Default is 1.
+
+       flush_packets integer (output)
+	   Flush the underlying I/O stream after each packet. Default is -1
+	   (auto), which means that the underlying protocol will decide, 1
+	   enables it, and has the effect of reducing the latency, 0 disables
+	   it and may increase IO throughput in some cases.
+
+       output_ts_offset offset (output)
+	   Set the output time offset.
+
+	   offset must be a time duration specification, see the Time duration
+	   section in the ffmpeg-utils(1) manual.
+
+	   The offset is added by the muxer to the output timestamps.
+
+	   Specifying a positive offset means that the corresponding streams
+	   are delayed bt the time duration specified in offset. Default value
+	   is 0 (meaning that no offset is applied).
+
+       format_whitelist list (input)
+	   "," separated list of allowed demuxers. By default all are allowed.
+
+       dump_separator string (input)
+	   Separator used to separate the fields printed on the command line
+	   about the Stream parameters.  For example, to separate the fields
+	   with newlines and indentation:
+
+		   ffprobe -dump_separator "
+					     "	-i ~/videos/matrixbench_mpeg2.mpg
+
+       max_streams integer (input)
+	   Specifies the maximum number of streams. This can be used to reject
+	   files that would require too many resources due to a large number
+	   of streams.
+
+       skip_estimate_duration_from_pts bool (input)
+	   Skip estimation of input duration when calculated using PTS.  At
+	   present, applicable for MPEG-PS and MPEG-TS.
+
+       strict, f_strict integer (input/output)
+	   Specify how strictly to follow the standards. "f_strict" is
+	   deprecated and should be used only via the ffmpeg tool.
+
+	   Possible values:
+
+	   very
+	       strictly conform to an older more strict version of the spec or
+	       reference software
+
+	   strict
+	       strictly conform to all the things in the spec no matter what
+	       consequences
+
+	   normal
+	   unofficial
+	       allow unofficial extensions
+
+	   experimental
+	       allow non standardized experimental things, experimental
+	       (unfinished/work in progress/not well tested) decoders and
+	       encoders.  Note: experimental decoders can pose a security
+	       risk, do not use this for decoding untrusted input.
+
+   Format stream specifiers
+       Format stream specifiers allow selection of one or more streams that
+       match specific properties.
+
+       The exact semantics of stream specifiers is defined by the
+       "avformat_match_stream_specifier()" function declared in the
+       libavformat/avformat.h header and documented in the Stream specifiers
+       section in the ffmpeg(1) manual.
+
+DEMUXERS
+       Demuxers are configured elements in FFmpeg that can read the multimedia
+       streams from a particular type of file.
+
+       When you configure your FFmpeg build, all the supported demuxers are
+       enabled by default. You can list all available ones using the configure
+       option "--list-demuxers".
+
+       You can disable all the demuxers using the configure option
+       "--disable-demuxers", and selectively enable a single demuxer with the
+       option "--enable-demuxer=DEMUXER", or disable it with the option
+       "--disable-demuxer=DEMUXER".
+
+       The option "-demuxers" of the ff* tools will display the list of
+       enabled demuxers. Use "-formats" to view a combined list of enabled
+       demuxers and muxers.
+
+       The description of some of the currently available demuxers follows.
+
+   aa
+       Audible Format 2, 3, and 4 demuxer.
+
+       This demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.
+
+   aac
+       Raw Audio Data Transport Stream AAC demuxer.
+
+       This demuxer is used to demux an ADTS input containing a single AAC
+       stream alongwith any ID3v1/2 or APE tags in it.
+
+   apng
+       Animated Portable Network Graphics demuxer.
+
+       This demuxer is used to demux APNG files.  All headers, but the PNG
+       signature, up to (but not including) the first fcTL chunk are
+       transmitted as extradata.  Frames are then split as being all the
+       chunks between two fcTL ones, or between the last fcTL and IEND chunks.
+
+       -ignore_loop bool
+	   Ignore the loop variable in the file if set. Default is enabled.
+
+       -max_fps int
+	   Maximum framerate in frames per second. Default of 0 imposes no
+	   limit.
+
+       -default_fps int
+	   Default framerate in frames per second when none is specified in
+	   the file (0 meaning as fast as possible). Default is 15.
+
+   asf
+       Advanced Systems Format demuxer.
+
+       This demuxer is used to demux ASF files and MMS network streams.
+
+       -no_resync_search bool
+	   Do not try to resynchronize by looking for a certain optional start
+	   code.
+
+   concat
+       Virtual concatenation script demuxer.
+
+       This demuxer reads a list of files and other directives from a text
+       file and demuxes them one after the other, as if all their packets had
+       been muxed together.
+
+       The timestamps in the files are adjusted so that the first file starts
+       at 0 and each next file starts where the previous one finishes. Note
+       that it is done globally and may cause gaps if all streams do not have
+       exactly the same length.
+
+       All files must have the same streams (same codecs, same time base,
+       etc.).
+
+       The duration of each file is used to adjust the timestamps of the next
+       file: if the duration is incorrect (because it was computed using the
+       bit-rate or because the file is truncated, for example), it can cause
+       artifacts. The "duration" directive can be used to override the
+       duration stored in each file.
+
+       Syntax
+
+       The script is a text file in extended-ASCII, with one directive per
+       line.  Empty lines, leading spaces and lines starting with '#' are
+       ignored. The following directive is recognized:
+
+       "file path"
+	   Path to a file to read; special characters and spaces must be
+	   escaped with backslash or single quotes.
+
+	   All subsequent file-related directives apply to that file.
+
+       "ffconcat version 1.0"
+	   Identify the script type and version.
+
+	   To make FFmpeg recognize the format automatically, this directive
+	   must appear exactly as is (no extra space or byte-order-mark) on
+	   the very first line of the script.
+
+       "duration dur"
+	   Duration of the file. This information can be specified from the
+	   file; specifying it here may be more efficient or help if the
+	   information from the file is not available or accurate.
+
+	   If the duration is set for all files, then it is possible to seek
+	   in the whole concatenated video.
+
+       "inpoint timestamp"
+	   In point of the file. When the demuxer opens the file it instantly
+	   seeks to the specified timestamp. Seeking is done so that all
+	   streams can be presented successfully at In point.
+
+	   This directive works best with intra frame codecs, because for non-
+	   intra frame ones you will usually get extra packets before the
+	   actual In point and the decoded content will most likely contain
+	   frames before In point too.
+
+	   For each file, packets before the file In point will have
+	   timestamps less than the calculated start timestamp of the file
+	   (negative in case of the first file), and the duration of the files
+	   (if not specified by the "duration" directive) will be reduced
+	   based on their specified In point.
+
+	   Because of potential packets before the specified In point, packet
+	   timestamps may overlap between two concatenated files.
+
+       "outpoint timestamp"
+	   Out point of the file. When the demuxer reaches the specified
+	   decoding timestamp in any of the streams, it handles it as an end
+	   of file condition and skips the current and all the remaining
+	   packets from all streams.
+
+	   Out point is exclusive, which means that the demuxer will not
+	   output packets with a decoding timestamp greater or equal to Out
+	   point.
+
+	   This directive works best with intra frame codecs and formats where
+	   all streams are tightly interleaved. For non-intra frame codecs you
+	   will usually get additional packets with presentation timestamp
+	   after Out point therefore the decoded content will most likely
+	   contain frames after Out point too. If your streams are not tightly
+	   interleaved you may not get all the packets from all streams before
+	   Out point and you may only will be able to decode the earliest
+	   stream until Out point.
+
+	   The duration of the files (if not specified by the "duration"
+	   directive) will be reduced based on their specified Out point.
+
+       "file_packet_metadata key=value"
+	   Metadata of the packets of the file. The specified metadata will be
+	   set for each file packet. You can specify this directive multiple
+	   times to add multiple metadata entries.  This directive is
+	   deprecated, use "file_packet_meta" instead.
+
+       "file_packet_meta key value"
+	   Metadata of the packets of the file. The specified metadata will be
+	   set for each file packet. You can specify this directive multiple
+	   times to add multiple metadata entries.
+
+       "option key value"
+	   Option to access, open and probe the file.  Can be present multiple
+	   times.
+
+       "stream"
+	   Introduce a stream in the virtual file.  All subsequent stream-
+	   related directives apply to the last introduced stream.  Some
+	   streams properties must be set in order to allow identifying the
+	   matching streams in the subfiles.  If no streams are defined in the
+	   script, the streams from the first file are copied.
+
+       "exact_stream_id id"
+	   Set the id of the stream.  If this directive is given, the string
+	   with the corresponding id in the subfiles will be used.  This is
+	   especially useful for MPEG-PS (VOB) files, where the order of the
+	   streams is not reliable.
+
+       "stream_meta key value"
+	   Metadata for the stream.  Can be present multiple times.
+
+       "stream_codec value"
+	   Codec for the stream.
+
+       "stream_extradata hex_string"
+	   Extradata for the string, encoded in hexadecimal.
+
+       "chapter id start end"
+	   Add a chapter. id is an unique identifier, possibly small and
+	   consecutive.
+
+       Options
+
+       This demuxer accepts the following option:
+
+       safe
+	   If set to 1, reject unsafe file paths and directives.  A file path
+	   is considered safe if it does not contain a protocol specification
+	   and is relative and all components only contain characters from the
+	   portable character set (letters, digits, period, underscore and
+	   hyphen) and have no period at the beginning of a component.
+
+	   If set to 0, any file name is accepted.
+
+	   The default is 1.
+
+       auto_convert
+	   If set to 1, try to perform automatic conversions on packet data to
+	   make the streams concatenable.  The default is 1.
+
+	   Currently, the only conversion is adding the h264_mp4toannexb
+	   bitstream filter to H.264 streams in MP4 format. This is necessary
+	   in particular if there are resolution changes.
+
+       segment_time_metadata
+	   If set to 1, every packet will contain the lavf.concat.start_time
+	   and the lavf.concat.duration packet metadata values which are the
+	   start_time and the duration of the respective file segments in the
+	   concatenated output expressed in microseconds. The duration
+	   metadata is only set if it is known based on the concat file.  The
+	   default is 0.
+
+       Examples
+
+       o   Use absolute filenames and include some comments:
+
+		   # my first filename
+		   file /mnt/share/file-1.wav
+		   # my second filename including whitespace
+		   file '/mnt/share/file 2.wav'
+		   # my third filename including whitespace plus single quote
+		   file '/mnt/share/file 3'\''.wav'
+
+       o   Allow for input format auto-probing, use safe filenames and set the
+	   duration of the first file:
+
+		   ffconcat version 1.0
+
+		   file file-1.wav
+		   duration 20.0
+
+		   file subdir/file-2.wav
+
+   dash
+       Dynamic Adaptive Streaming over HTTP demuxer.
+
+       This demuxer presents all AVStreams found in the manifest.  By setting
+       the discard flags on AVStreams the caller can decide which streams to
+       actually receive.  Each stream mirrors the "id" and "bandwidth"
+       properties from the "<Representation>" as metadata keys named "id" and
+       "variant_bitrate" respectively.
+
+       Options
+
+       This demuxer accepts the following option:
+
+       cenc_decryption_key
+	   16-byte key, in hex, to decrypt files encrypted using ISO Common
+	   Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+
+   dvdvideo
+       DVD-Video demuxer, powered by libdvdnav and libdvdread.
+
+       Can directly ingest DVD titles, specifically sequential PGCs, into a
+       conversion pipeline. Menu assets, such as background video or audio,
+       can also be demuxed given the menu's coordinates (at best effort).
+       Seeking is not supported at this time.
+
+       Block devices (DVD drives), ISO files, and directory structures are
+       accepted.  Activate with "-f dvdvideo" in front of one of these inputs.
+
+       This demuxer does NOT have decryption code of any kind. You are on your
+       own working with encrypted DVDs, and should not expect support on the
+       matter.
+
+       Underlying playback is handled by libdvdnav, and structure parsing by
+       libdvdread.  FFmpeg must be built with GPL library support available as
+       well as the configure switches "--enable-libdvdnav" and
+       "--enable-libdvdread".
+
+       You will need to provide either the desired "title number" or exact
+       PGC/PG coordinates.  Many open-source DVD players and tools can aid in
+       providing this information.  If not specified, the demuxer will default
+       to title 1 which works for many discs.  However, due to the flexibility
+       of the format, it is recommended to check manually.  There are many
+       discs that are authored strangely or with invalid headers.
+
+       If the input is a real DVD drive, please note that there are some
+       drives which may silently fail on reading bad sectors from the disc,
+       returning random bits instead which is effectively corrupt data. This
+       is especially prominent on aging or rotting discs.  A second pass and
+       integrity checks would be needed to detect the corruption.  This is not
+       an FFmpeg issue.
+
+       Background
+
+       DVD-Video is not a directly accessible, linear container format in the
+       traditional sense. Instead, it allows for complex and programmatic
+       playback of carefully muxed MPEG-PS streams that are stored in
+       headerless VOB files.  To the end-user, these streams are known simply
+       as "titles", but the actual logical playback sequence is defined by one
+       or more "PGCs", or Program Group Chains, within the title. The PGC is
+       in turn comprised of multiple "PGs", or Programs", which are the actual
+       video segments (and for a typical video feature, sequentially ordered).
+       The PGC structure, along with stream layout and metadata, are stored in
+       IFO files that need to be parsed. PGCs can be thought of as playlists
+       in easier terms.
+
+       An actual DVD player relies on user GUI interaction via menus and an
+       internal VM to drive the direction of demuxing. Generally, the user
+       would either navigate (via menus) or automatically be redirected to the
+       PGC of their choice. During this process and the subsequent playback,
+       the DVD player's internal VM also maintains a state and executes
+       instructions that can create jumps to different sectors during
+       playback.  This is why libdvdnav is involved, as a linear read of the
+       MPEG-PS blobs on the disc (VOBs) is not enough to produce the right
+       sequence in many cases.
+
+       There are many other DVD structures (a long subject) that will not be
+       discussed here.	NAV packets, in particular, are handled by this
+       demuxer to build accurate timing but not emitted as a stream. For a
+       good high-level understanding, refer to:
+       <https://code.videolan.org/videolan/libdvdnav/-/blob/master/doc/dvd_structures>
+
+       Options
+
+       This demuxer accepts the following options:
+
+       title int
+	   The title number to play. Must be set if pgc and pg are not set.
+	   Not applicable to menus.  Default is 0 (auto), which currently only
+	   selects the first available title (title 1) and notifies the user
+	   about the implications.
+
+       chapter_start int
+	   The chapter, or PTT (part-of-title), number to start at. Not
+	   applicable to menus.  Default is 1.
+
+       chapter_end int
+	   The chapter, or PTT (part-of-title), number to end at. Not
+	   applicable to menus.  Default is 0, which is a special value to
+	   signal end at the last possible chapter.
+
+       angle int
+	   The video angle number, referring to what is essentially an
+	   additional video stream that is composed from alternate frames
+	   interleaved in the VOBs.  Not applicable to menus.  Default is 1.
+
+       region int
+	   The region code to use for playback. Some discs may use this to
+	   default playback at a particular angle in different regions. This
+	   option will not affect the region code of a real DVD drive, if used
+	   as an input. Not applicable to menus.  Default is 0, "world".
+
+       menu bool
+	   Demux menu assets instead of navigating a title. Requires exact
+	   coordinates of the menu (menu_lu, menu_vts, pgc, pg).  Default is
+	   false.
+
+       menu_lu int
+	   The menu language to demux. In DVD, menus are grouped by language.
+	   Default is 0, the first language unit.
+
+       menu_vts int
+	   The VTS where the menu lives, or 0 if it is a VMG menu (root-
+	   level).  Default is 0, VMG menu.
+
+       pgc int
+	   The entry PGC to start playback, in conjunction with pg.
+	   Alternative to setting title.  Chapter markers are not supported at
+	   this time.  Must be explicitly set for menus.  Default is 0,
+	   automatically resolve from value of title.
+
+       pg int
+	   The entry PG to start playback, in conjunction with pgc.
+	   Alternative to setting title.  Chapter markers are not supported at
+	   this time.  Default is 0, automatically resolve from value of
+	   title, or start from the beginning (PG 1) of the menu.
+
+       preindex bool
+	   Enable this to have accurate chapter (PTT) markers and duration
+	   measurement, which requires a slow second pass read in order to
+	   index the chapter marker timestamps from NAV packets. This is non-
+	   ideal extra work for real optical drives.  It is recommended and
+	   faster to use this option with a backup of the DVD structure stored
+	   on a hard drive. Not compatible with pgc and pg.  Not applicable to
+	   menus.  Default is 0, false.
+
+       trim bool
+	   Skip padding cells (i.e. cells shorter than 1 second) from the
+	   beginning.  There exist many discs with filler segments at the
+	   beginning of the PGC, often with junk data intended for controlling
+	   a real DVD player's buffering speed and with no other material data
+	   value.  Not applicable to menus.  Default is 1, true.
+
+       Examples
+
+       o   Open title 3 from a given DVD structure:
+
+		   ffmpeg -f dvdvideo -title 3 -i <path to DVD> ...
+
+       o   Open chapters 3-6 from title 1 from a given DVD structure:
+
+		   ffmpeg -f dvdvideo -chapter_start 3 -chapter_end 6 -title 1 -i <path to DVD> ...
+
+       o   Open only chapter 5 from title 1 from a given DVD structure:
+
+		   ffmpeg -f dvdvideo -chapter_start 5 -chapter_end 5 -title 1 -i <path to DVD> ...
+
+       o   Demux menu with language 1 from VTS 1, PGC 1, starting at PG 1:
+
+		   ffmpeg -f dvdvideo -menu 1 -menu_lu 1 -menu_vts 1 -pgc 1 -pg 1 -i <path to DVD> ...
+
+   ea
+       Electronic Arts Multimedia format demuxer.
+
+       This format is used by various Electronic Arts games.
+
+       Options
+
+       merge_alpha bool
+	   Normally the VP6 alpha channel (if exists) is returned as a
+	   secondary video stream, by setting this option you can make the
+	   demuxer return a single video stream which contains the alpha
+	   channel in addition to the ordinary video.
+
+   imf
+       Interoperable Master Format demuxer.
+
+       This demuxer presents audio and video streams found in an IMF
+       Composition, as specified in
+       <https://doi.org/10.5594/SMPTE.ST2067-2.2020>.
+
+	       ffmpeg [-assetmaps <path of ASSETMAP1>,<path of ASSETMAP2>,...] -i <path of CPL> ...
+
+       If "-assetmaps" is not specified, the demuxer looks for a file called
+       ASSETMAP.xml in the same directory as the CPL.
+
+   flv, live_flv, kux
+       Adobe Flash Video Format demuxer.
+
+       This demuxer is used to demux FLV files and RTMP network streams. In
+       case of live network streams, if you force format, you may use live_flv
+       option instead of flv to survive timestamp discontinuities.  KUX is a
+       flv variant used on the Youku platform.
+
+	       ffmpeg -f flv -i myfile.flv ...
+	       ffmpeg -f live_flv -i rtmp://<any.server>/anything/key ....
+
+       -flv_metadata bool
+	   Allocate the streams according to the onMetaData array content.
+
+       -flv_ignore_prevtag bool
+	   Ignore the size of previous tag value.
+
+       -flv_full_metadata bool
+	   Output all context of the onMetadata.
+
+   gif
+       Animated GIF demuxer.
+
+       It accepts the following options:
+
+       min_delay
+	   Set the minimum valid delay between frames in hundredths of
+	   seconds.  Range is 0 to 6000. Default value is 2.
+
+       max_gif_delay
+	   Set the maximum valid delay between frames in hundredth of seconds.
+	   Range is 0 to 65535. Default value is 65535 (nearly eleven
+	   minutes), the maximum value allowed by the specification.
+
+       default_delay
+	   Set the default delay between frames in hundredths of seconds.
+	   Range is 0 to 6000. Default value is 10.
+
+       ignore_loop
+	   GIF files can contain information to loop a certain number of times
+	   (or infinitely). If ignore_loop is set to 1, then the loop setting
+	   from the input will be ignored and looping will not occur. If set
+	   to 0, then looping will occur and will cycle the number of times
+	   according to the GIF. Default value is 1.
+
+       For example, with the overlay filter, place an infinitely looping GIF
+       over another video:
+
+	       ffmpeg -i input.mp4 -ignore_loop 0 -i input.gif -filter_complex overlay=shortest=1 out.mkv
+
+       Note that in the above example the shortest option for overlay filter
+       is used to end the output video at the length of the shortest input
+       file, which in this case is input.mp4 as the GIF in this example loops
+       infinitely.
+
+   hls
+       HLS demuxer
+
+       Apple HTTP Live Streaming demuxer.
+
+       This demuxer presents all AVStreams from all variant streams.  The id
+       field is set to the bitrate variant index number. By setting the
+       discard flags on AVStreams (by pressing 'a' or 'v' in ffplay), the
+       caller can decide which variant streams to actually receive.  The total
+       bitrate of the variant that the stream belongs to is available in a
+       metadata key named "variant_bitrate".
+
+       It accepts the following options:
+
+       live_start_index
+	   segment index to start live streams at (negative values are from
+	   the end).
+
+       prefer_x_start
+	   prefer to use #EXT-X-START if it's in playlist instead of
+	   live_start_index.
+
+       allowed_extensions
+	   ',' separated list of file extensions that hls is allowed to
+	   access.
+
+       max_reload
+	   Maximum number of times a insufficient list is attempted to be
+	   reloaded.  Default value is 1000.
+
+       m3u8_hold_counters
+	   The maximum number of times to load m3u8 when it refreshes without
+	   new segments.  Default value is 1000.
+
+       http_persistent
+	   Use persistent HTTP connections. Applicable only for HTTP streams.
+	   Enabled by default.
+
+       http_multiple
+	   Use multiple HTTP connections for downloading HTTP segments.
+	   Enabled by default for HTTP/1.1 servers.
+
+       http_seekable
+	   Use HTTP partial requests for downloading HTTP segments.  0 =
+	   disable, 1 = enable, -1 = auto, Default is auto.
+
+       seg_format_options
+	   Set options for the demuxer of media segments using a list of
+	   key=value pairs separated by ":".
+
+       seg_max_retry
+	   Maximum number of times to reload a segment on error, useful when
+	   segment skip on network error is not desired.  Default value is 0.
+
+   image2
+       Image file demuxer.
+
+       This demuxer reads from a list of image files specified by a pattern.
+       The syntax and meaning of the pattern is specified by the option
+       pattern_type.
+
+       The pattern may contain a suffix which is used to automatically
+       determine the format of the images contained in the files.
+
+       The size, the pixel format, and the format of each image must be the
+       same for all the files in the sequence.
+
+       This demuxer accepts the following options:
+
+       framerate
+	   Set the frame rate for the video stream. It defaults to 25.
+
+       loop
+	   If set to 1, loop over the input. Default value is 0.
+
+       pattern_type
+	   Select the pattern type used to interpret the provided filename.
+
+	   pattern_type accepts one of the following values.
+
+	   none
+	       Disable pattern matching, therefore the video will only contain
+	       the specified image. You should use this option if you do not
+	       want to create sequences from multiple images and your
+	       filenames may contain special pattern characters.
+
+	   sequence
+	       Select a sequence pattern type, used to specify a sequence of
+	       files indexed by sequential numbers.
+
+	       A sequence pattern may contain the string "%d" or "%0Nd", which
+	       specifies the position of the characters representing a
+	       sequential number in each filename matched by the pattern. If
+	       the form "%d0Nd" is used, the string representing the number in
+	       each filename is 0-padded and N is the total number of 0-padded
+	       digits representing the number. The literal character '%' can
+	       be specified in the pattern with the string "%%".
+
+	       If the sequence pattern contains "%d" or "%0Nd", the first
+	       filename of the file list specified by the pattern must contain
+	       a number inclusively contained between start_number and
+	       start_number+start_number_range-1, and all the following
+	       numbers must be sequential.
+
+	       For example the pattern "img-%03d.bmp" will match a sequence of
+	       filenames of the form img-001.bmp, img-002.bmp, ...,
+	       img-010.bmp, etc.; the pattern "i%%m%%g-%d.jpg" will match a
+	       sequence of filenames of the form i%m%g-1.jpg, i%m%g-2.jpg,
+	       ..., i%m%g-10.jpg, etc.
+
+	       Note that the pattern must not necessarily contain "%d" or
+	       "%0Nd", for example to convert a single image file img.jpeg you
+	       can employ the command:
+
+		       ffmpeg -i img.jpeg img.png
+
+	   glob
+	       Select a glob wildcard pattern type.
+
+	       The pattern is interpreted like a "glob()" pattern. This is
+	       only selectable if libavformat was compiled with globbing
+	       support.
+
+	   glob_sequence (deprecated, will be removed)
+	       Select a mixed glob wildcard/sequence pattern.
+
+	       If your version of libavformat was compiled with globbing
+	       support, and the provided pattern contains at least one glob
+	       meta character among "%*?[]{}" that is preceded by an unescaped
+	       "%", the pattern is interpreted like a "glob()" pattern,
+	       otherwise it is interpreted like a sequence pattern.
+
+	       All glob special characters "%*?[]{}" must be prefixed with
+	       "%". To escape a literal "%" you shall use "%%".
+
+	       For example the pattern "foo-%*.jpeg" will match all the
+	       filenames prefixed by "foo-" and terminating with ".jpeg", and
+	       "foo-%?%?%?.jpeg" will match all the filenames prefixed with
+	       "foo-", followed by a sequence of three characters, and
+	       terminating with ".jpeg".
+
+	       This pattern type is deprecated in favor of glob and sequence.
+
+	   Default value is glob_sequence.
+
+       pixel_format
+	   Set the pixel format of the images to read. If not specified the
+	   pixel format is guessed from the first image file in the sequence.
+
+       start_number
+	   Set the index of the file matched by the image file pattern to
+	   start to read from. Default value is 0.
+
+       start_number_range
+	   Set the index interval range to check when looking for the first
+	   image file in the sequence, starting from start_number. Default
+	   value is 5.
+
+       ts_from_file
+	   If set to 1, will set frame timestamp to modification time of image
+	   file. Note that monotonity of timestamps is not provided: images go
+	   in the same order as without this option. Default value is 0.  If
+	   set to 2, will set frame timestamp to the modification time of the
+	   image file in nanosecond precision.
+
+       video_size
+	   Set the video size of the images to read. If not specified the
+	   video size is guessed from the first image file in the sequence.
+
+       export_path_metadata
+	   If set to 1, will add two extra fields to the metadata found in
+	   input, making them also available for other filters (see drawtext
+	   filter for examples). Default value is 0. The extra fields are
+	   described below:
+
+	   lavf.image2dec.source_path
+	       Corresponds to the full path to the input file being read.
+
+	   lavf.image2dec.source_basename
+	       Corresponds to the name of the file being read.
+
+       Examples
+
+       o   Use ffmpeg for creating a video from the images in the file
+	   sequence img-001.jpeg, img-002.jpeg, ..., assuming an input frame
+	   rate of 10 frames per second:
+
+		   ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
+
+       o   As above, but start by reading from a file with index 100 in the
+	   sequence:
+
+		   ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
+
+       o   Read images matching the "*.png" glob pattern , that is all the
+	   files terminating with the ".png" suffix:
+
+		   ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
+
+   libgme
+       The Game Music Emu library is a collection of video game music file
+       emulators.
+
+       See <https://bitbucket.org/mpyne/game-music-emu/overview> for more
+       information.
+
+       It accepts the following options:
+
+       track_index
+	   Set the index of which track to demux. The demuxer can only export
+	   one track.  Track indexes start at 0. Default is to pick the first
+	   track. Number of tracks is exported as tracks metadata entry.
+
+       sample_rate
+	   Set the sampling rate of the exported track. Range is 1000 to
+	   999999. Default is 44100.
+
+       max_size (bytes)
+	   The demuxer buffers the entire file into memory. Adjust this value
+	   to set the maximum buffer size, which in turn, acts as a ceiling
+	   for the size of files that can be read.  Default is 50 MiB.
+
+   libmodplug
+       ModPlug based module demuxer
+
+       See <https://github.com/Konstanty/libmodplug>
+
+       It will export one 2-channel 16-bit 44.1 kHz audio stream.  Optionally,
+       a "pal8" 16-color video stream can be exported with or without printed
+       metadata.
+
+       It accepts the following options:
+
+       noise_reduction
+	   Apply a simple low-pass filter. Can be 1 (on) or 0 (off). Default
+	   is 0.
+
+       reverb_depth
+	   Set amount of reverb. Range 0-100. Default is 0.
+
+       reverb_delay
+	   Set delay in ms, clamped to 40-250 ms. Default is 0.
+
+       bass_amount
+	   Apply bass expansion a.k.a. XBass or megabass. Range is 0 (quiet)
+	   to 100 (loud). Default is 0.
+
+       bass_range
+	   Set cutoff i.e. upper-bound for bass frequencies. Range is 10-100
+	   Hz. Default is 0.
+
+       surround_depth
+	   Apply a Dolby Pro-Logic surround effect. Range is 0 (quiet) to 100
+	   (heavy). Default is 0.
+
+       surround_delay
+	   Set surround delay in ms, clamped to 5-40 ms. Default is 0.
+
+       max_size
+	   The demuxer buffers the entire file into memory. Adjust this value
+	   to set the maximum buffer size, which in turn, acts as a ceiling
+	   for the size of files that can be read. Range is 0 to 100 MiB.  0
+	   removes buffer size limit (not recommended). Default is 5 MiB.
+
+       video_stream_expr
+	   String which is evaluated using the eval API to assign colors to
+	   the generated video stream.	Variables which can be used are "x",
+	   "y", "w", "h", "t", "speed", "tempo", "order", "pattern" and "row".
+
+       video_stream
+	   Generate video stream. Can be 1 (on) or 0 (off). Default is 0.
+
+       video_stream_w
+	   Set video frame width in 'chars' where one char indicates 8 pixels.
+	   Range is 20-512. Default is 30.
+
+       video_stream_h
+	   Set video frame height in 'chars' where one char indicates 8
+	   pixels. Range is 20-512. Default is 30.
+
+       video_stream_ptxt
+	   Print metadata on video stream. Includes "speed", "tempo", "order",
+	   "pattern", "row" and "ts" (time in ms). Can be 1 (on) or 0 (off).
+	   Default is 1.
+
+   libopenmpt
+       libopenmpt based module demuxer
+
+       See <https://lib.openmpt.org/libopenmpt/> for more information.
+
+       Some files have multiple subsongs (tracks) this can be set with the
+       subsong option.
+
+       It accepts the following options:
+
+       subsong
+	   Set the subsong index. This can be either  'all', 'auto', or the
+	   index of the subsong. Subsong indexes start at 0. The default is
+	   'auto'.
+
+	   The default value is to let libopenmpt choose.
+
+       layout
+	   Set the channel layout. Valid values are 1, 2, and 4 channel
+	   layouts.  The default value is STEREO.
+
+       sample_rate
+	   Set the sample rate for libopenmpt to output.  Range is from 1000
+	   to INT_MAX. The value default is 48000.
+
+   mov/mp4/3gp
+       Demuxer for Quicktime File Format & ISO/IEC Base Media File Format
+       (ISO/IEC 14496-12 or MPEG-4 Part 12, ISO/IEC 15444-12 or JPEG 2000 Part
+       12).
+
+       Registered extensions: mov, mp4, m4a, 3gp, 3g2, mj2, psp, m4b, ism,
+       ismv, isma, f4v
+
+       Options
+
+       This demuxer accepts the following options:
+
+       enable_drefs
+	   Enable loading of external tracks, disabled by default.  Enabling
+	   this can theoretically leak information in some use cases.
+
+       use_absolute_path
+	   Allows loading of external tracks via absolute paths, disabled by
+	   default.  Enabling this poses a security risk. It should only be
+	   enabled if the source is known to be non-malicious.
+
+       seek_streams_individually
+	   When seeking, identify the closest point in each stream
+	   individually and demux packets in that stream from identified
+	   point. This can lead to a different sequence of packets compared to
+	   demuxing linearly from the beginning. Default is true.
+
+       ignore_editlist
+	   Ignore any edit list atoms. The demuxer, by default, modifies the
+	   stream index to reflect the timeline described by the edit list.
+	   Default is false.
+
+       advanced_editlist
+	   Modify the stream index to reflect the timeline described by the
+	   edit list. "ignore_editlist" must be set to false for this option
+	   to be effective.  If both "ignore_editlist" and this option are set
+	   to false, then only the start of the stream index is modified to
+	   reflect initial dwell time or starting timestamp described by the
+	   edit list. Default is true.
+
+       ignore_chapters
+	   Don't parse chapters. This includes GoPro 'HiLight' tags/moments.
+	   Note that chapters are only parsed when input is seekable. Default
+	   is false.
+
+       use_mfra_for
+	   For seekable fragmented input, set fragment's starting timestamp
+	   from media fragment random access box, if present.
+
+	   Following options are available:
+
+	   auto
+	       Auto-detect whether to set mfra timestamps as PTS or DTS
+	       (default)
+
+	   dts Set mfra timestamps as DTS
+
+	   pts Set mfra timestamps as PTS
+
+	   0   Don't use mfra box to set timestamps
+
+       use_tfdt
+	   For fragmented input, set fragment's starting timestamp to
+	   "baseMediaDecodeTime" from the "tfdt" box.  Default is enabled,
+	   which will prefer to use the "tfdt" box to set DTS. Disable to use
+	   the "earliest_presentation_time" from the "sidx" box.  In either
+	   case, the timestamp from the "mfra" box will be used if it's
+	   available and "use_mfra_for" is set to pts or dts.
+
+       export_all
+	   Export unrecognized boxes within the udta box as metadata entries.
+	   The first four characters of the box type are set as the key.
+	   Default is false.
+
+       export_xmp
+	   Export entire contents of XMP_ box and uuid box as a string with
+	   key "xmp". Note that if "export_all" is set and this option isn't,
+	   the contents of XMP_ box are still exported but with key "XMP_".
+	   Default is false.
+
+       activation_bytes
+	   4-byte key required to decrypt Audible AAX and AAX+ files. See
+	   Audible AAX subsection below.
+
+       audible_fixed_key
+	   Fixed key used for handling Audible AAX/AAX+ files. It has been
+	   pre-set so should not be necessary to specify.
+
+       decryption_key
+	   16-byte key, in hex, to decrypt files encrypted using ISO Common
+	   Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+
+       max_stts_delta
+	   Very high sample deltas written in a trak's stts box may
+	   occasionally be intended but usually they are written in error or
+	   used to store a negative value for dts correction when treated as
+	   signed 32-bit integers. This option lets the user set an upper
+	   limit, beyond which the delta is clamped to 1. Values greater than
+	   the limit if negative when cast to int32 are used to adjust onward
+	   dts.
+
+	   Unit is the track time scale. Range is 0 to UINT_MAX. Default is
+	   "UINT_MAX - 48000*10" which allows up to a 10 second dts correction
+	   for 48 kHz audio streams while accommodating 99.9% of "uint32"
+	   range.
+
+       interleaved_read
+	   Interleave packets from multiple tracks at demuxer level. For badly
+	   interleaved files, this prevents playback issues caused by large
+	   gaps between packets in different tracks, as MOV/MP4 do not have
+	   packet placement requirements.  However, this can cause excessive
+	   seeking on very badly interleaved files, due to seeking between
+	   tracks, so disabling it may prevent I/O issues, at the expense of
+	   playback.
+
+       Audible AAX
+
+       Audible AAX files are encrypted M4B files, and they can be decrypted by
+       specifying a 4 byte activation secret.
+
+	       ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
+
+   mpegts
+       MPEG-2 transport stream demuxer.
+
+       This demuxer accepts the following options:
+
+       resync_size
+	   Set size limit for looking up a new synchronization. Default value
+	   is 65536.
+
+       skip_unknown_pmt
+	   Skip PMTs for programs not defined in the PAT. Default value is 0.
+
+       fix_teletext_pts
+	   Override teletext packet PTS and DTS values with the timestamps
+	   calculated from the PCR of the first program which the teletext
+	   stream is part of and is not discarded. Default value is 1, set
+	   this option to 0 if you want your teletext packet PTS and DTS
+	   values untouched.
+
+       ts_packetsize
+	   Output option carrying the raw packet size in bytes.  Show the
+	   detected raw packet size, cannot be set by the user.
+
+       scan_all_pmts
+	   Scan and combine all PMTs. The value is an integer with value from
+	   -1 to 1 (-1 means automatic setting, 1 means enabled, 0 means
+	   disabled). Default value is -1.
+
+       merge_pmt_versions
+	   Re-use existing streams when a PMT's version is updated and
+	   elementary streams move to different PIDs. Default value is 0.
+
+       max_packet_size
+	   Set maximum size, in bytes, of packet emitted by the demuxer.
+	   Payloads above this size are split across multiple packets. Range
+	   is 1 to INT_MAX/2. Default is 204800 bytes.
+
+   mpjpeg
+       MJPEG encapsulated in multi-part MIME demuxer.
+
+       This demuxer allows reading of MJPEG, where each frame is represented
+       as a part of multipart/x-mixed-replace stream.
+
+       strict_mime_boundary
+	   Default implementation applies a relaxed standard to multi-part
+	   MIME boundary detection, to prevent regression with numerous
+	   existing endpoints not generating a proper MIME MJPEG stream.
+	   Turning this option on by setting it to 1 will result in a stricter
+	   check of the boundary value.
+
+   rawvideo
+       Raw video demuxer.
+
+       This demuxer allows one to read raw video data. Since there is no
+       header specifying the assumed video parameters, the user must specify
+       them in order to be able to decode the data correctly.
+
+       This demuxer accepts the following options:
+
+       framerate
+	   Set input video frame rate. Default value is 25.
+
+       pixel_format
+	   Set the input video pixel format. Default value is "yuv420p".
+
+       video_size
+	   Set the input video size. This value must be specified explicitly.
+
+       For example to read a rawvideo file input.raw with ffplay, assuming a
+       pixel format of "rgb24", a video size of "320x240", and a frame rate of
+       10 images per second, use the command:
+
+	       ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
+
+   sbg
+       SBaGen script demuxer.
+
+       This demuxer reads the script language used by SBaGen
+       <http://uazu.net/sbagen/> to generate binaural beats sessions. A SBG
+       script looks like that:
+
+	       -SE
+	       a: 300-2.5/3 440+4.5/0
+	       b: 300-2.5/0 440+4.5/3
+	       off: -
+	       NOW	== a
+	       +0:07:00 == b
+	       +0:14:00 == a
+	       +0:21:00 == b
+	       +0:30:00    off
+
+       A SBG script can mix absolute and relative timestamps. If the script
+       uses either only absolute timestamps (including the script start time)
+       or only relative ones, then its layout is fixed, and the conversion is
+       straightforward. On the other hand, if the script mixes both kind of
+       timestamps, then the NOW reference for relative timestamps will be
+       taken from the current time of day at the time the script is read, and
+       the script layout will be frozen according to that reference. That
+       means that if the script is directly played, the actual times will
+       match the absolute timestamps up to the sound controller's clock
+       accuracy, but if the user somehow pauses the playback or seeks, all
+       times will be shifted accordingly.
+
+   tedcaptions
+       JSON captions used for <http://www.ted.com/>.
+
+       TED does not provide links to the captions, but they can be guessed
+       from the page. The file tools/bookmarklets.html from the FFmpeg source
+       tree contains a bookmarklet to expose them.
+
+       This demuxer accepts the following option:
+
+       start_time
+	   Set the start time of the TED talk, in milliseconds. The default is
+	   15000 (15s). It is used to sync the captions with the downloadable
+	   videos, because they include a 15s intro.
+
+       Example: convert the captions to a format most players understand:
+
+	       ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt
+
+   vapoursynth
+       Vapoursynth wrapper.
+
+       Due to security concerns, Vapoursynth scripts will not be autodetected
+       so the input format has to be forced. For ff* CLI tools, add "-f
+       vapoursynth" before the input "-i yourscript.vpy".
+
+       This demuxer accepts the following option:
+
+       max_script_size
+	   The demuxer buffers the entire script into memory. Adjust this
+	   value to set the maximum buffer size, which in turn, acts as a
+	   ceiling for the size of scripts that can be read.  Default is 1
+	   MiB.
+
+   w64
+       Sony Wave64 Audio demuxer.
+
+       This demuxer accepts the following options:
+
+       max_size
+	   See the same option for the wav demuxer.
+
+   wav
+       RIFF Wave Audio demuxer.
+
+       This demuxer accepts the following options:
+
+       max_size
+	   Specify the maximum packet size in bytes for the demuxed packets.
+	   By default this is set to 0, which means that a sensible value is
+	   chosen based on the input format.
+
+MUXERS
+       Muxers are configured elements in FFmpeg which allow writing multimedia
+       streams to a particular type of file.
+
+       When you configure your FFmpeg build, all the supported muxers are
+       enabled by default. You can list all available muxers using the
+       configure option "--list-muxers".
+
+       You can disable all the muxers with the configure option
+       "--disable-muxers" and selectively enable / disable single muxers with
+       the options "--enable-muxer=MUXER" / "--disable-muxer=MUXER".
+
+       The option "-muxers" of the ff* tools will display the list of enabled
+       muxers. Use "-formats" to view a combined list of enabled demuxers and
+       muxers.
+
+       A description of some of the currently available muxers follows.
+
+   Raw muxers
+       This section covers raw muxers. They accept a single stream matching
+       the designated codec. They do not store timestamps or metadata. The
+       recognized extension is the same as the muxer name unless indicated
+       otherwise.
+
+       It comprises the following muxers. The media type and the eventual
+       extensions used to automatically selects the muxer from the output
+       extensions are also shown.
+
+       ac3 audio
+	   Dolby Digital, also known as AC-3.
+
+       adx audio
+	   CRI Middleware ADX audio.
+
+	   This muxer will write out the total sample count near the start of
+	   the first packet when the output is seekable and the count can be
+	   stored in 32 bits.
+
+       aptx audio
+	   aptX (Audio Processing Technology for Bluetooth)
+
+       aptx_hd audio (aptxdh)
+	   aptX HD (Audio Processing Technology for Bluetooth) audio
+
+       avs2 video (avs, avs2)
+	   AVS2-P2 (Audio Video Standard - Second generation - Part 2) / IEEE
+	   1857.4 video
+
+       avs3 video (avs3)
+	   AVS3-P2 (Audio Video Standard - Third generation - Part 2) / IEEE
+	   1857.10 video
+
+       cavsvideo video (cavs)
+	   Chinese AVS (Audio Video Standard - First generation)
+
+       codec2raw audio
+	   Codec 2 audio.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f codec2raw".
+
+       data any
+	   Generic data muxer.
+
+	   This muxer accepts a single stream with any codec of any type. The
+	   input stream has to be selected using the "-map" option with the
+	   ffmpeg CLI tool.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f data".
+
+       dfpwm audio (dfpwm)
+	   Raw DFPWM1a (Dynamic Filter Pulse With Modulation) audio muxer.
+
+       dirac video (drc, vc2)
+	   BBC Dirac video.
+
+	   The Dirac Pro codec is a subset and is standardized as SMPTE VC-2.
+
+       dnxhd video (dnxhd, dnxhr)
+	   Avid DNxHD video.
+
+	   It is standardized as SMPTE VC-3. Accepts DNxHR streams.
+
+       dts audio
+	   DTS Coherent Acoustics (DCA) audio
+
+       eac3 audio
+	   Dolby Digital Plus, also known as Enhanced AC-3
+
+       evc video (evc)
+	   MPEG-5 Essential Video Coding (EVC) / EVC / MPEG-5 Part 1 EVC video
+
+       g722 audio
+	   ITU-T G.722 audio
+
+       g723_1 audio (tco, rco)
+	   ITU-T G.723.1 audio
+
+       g726 audio
+	   ITU-T G.726 big-endian ("left-justified") audio.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f g726".
+
+       g726le audio
+	   ITU-T G.726 little-endian ("right-justified") audio.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f g726le".
+
+       gsm audio
+	   Global System for Mobile Communications audio
+
+       h261 video
+	   ITU-T H.261 video
+
+       h263 video
+	   ITU-T H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
+	   video
+
+       h264 video (h264, 264)
+	   ITU-T H.264 / MPEG-4 Part 10 AVC video. Bitstream shall be
+	   converted to Annex B syntax if it's in length-prefixed mode.
+
+       hevc video (hevc, h265, 265)
+	   ITU-T H.265 / MPEG-H Part 2 HEVC video. Bitstream shall be
+	   converted to Annex B syntax if it's in length-prefixed mode.
+
+       m4v video
+	   MPEG-4 Part 2 video
+
+       mjpeg video (mjpg, mjpeg)
+	   Motion JPEG video
+
+       mlp audio
+	   Meridian Lossless Packing, also known as Packed PCM
+
+       mp2 audio (mp2, m2a, mpa)
+	   MPEG-1 Audio Layer II audio
+
+       mpeg1video video (mpg, mpeg, m1v)
+	   MPEG-1 Part 2 video.
+
+       mpeg2video video (m2v)
+	   ITU-T H.262 / MPEG-2 Part 2 video
+
+       obu video
+	   AV1 low overhead Open Bitstream Units muxer.
+
+	   Temporal delimiter OBUs will be inserted in all temporal units of
+	   the stream.
+
+       rawvideo video (yuv, rgb)
+	   Raw uncompressed video.
+
+       sbc audio (sbc, msbc)
+	   Bluetooth SIG low-complexity subband codec audio
+
+       truehd audio (thd)
+	   Dolby TrueHD audio
+
+       vc1 video
+	   SMPTE 421M / VC-1 video
+
+       Examples
+
+       o   Store raw video frames with the rawvideo muxer using ffmpeg:
+
+		   ffmpeg -f lavfi -i testsrc -t 10 -s hd1080p testsrc.yuv
+
+	   Since the rawvideo muxer do not store the information related to
+	   size and format, this information must be provided when demuxing
+	   the file:
+
+		   ffplay -video_size 1920x1080 -pixel_format rgb24 -f rawvideo testsrc.rgb
+
+   Raw PCM muxers
+       This section covers raw PCM (Pulse-Code Modulation) audio muxers.
+
+       They accept a single stream matching the designated codec. They do not
+       store timestamps or metadata. The recognized extension is the same as
+       the muxer name.
+
+       It comprises the following muxers. The optional additional extension
+       used to automatically select the muxer from the output extension is
+       also shown in parentheses.
+
+       alaw (al)
+	   PCM A-law
+
+       f32be
+	   PCM 32-bit floating-point big-endian
+
+       f32le
+	   PCM 32-bit floating-point little-endian
+
+       f64be
+	   PCM 64-bit floating-point big-endian
+
+       f64le
+	   PCM 64-bit floating-point little-endian
+
+       mulaw (ul)
+	   PCM mu-law
+
+       s16be
+	   PCM signed 16-bit big-endian
+
+       s16le
+	   PCM signed 16-bit little-endian
+
+       s24be
+	   PCM signed 24-bit big-endian
+
+       s24le
+	   PCM signed 24-bit little-endian
+
+       s32be
+	   PCM signed 32-bit big-endian
+
+       s32le
+	   PCM signed 32-bit little-endian
+
+       s8 (sb)
+	   PCM signed 8-bit
+
+       u16be
+	   PCM unsigned 16-bit big-endian
+
+       u16le
+	   PCM unsigned 16-bit little-endian
+
+       u24be
+	   PCM unsigned 24-bit big-endian
+
+       u24le
+	   PCM unsigned 24-bit little-endian
+
+       u32be
+	   PCM unsigned 32-bit big-endian
+
+       u32le
+	   PCM unsigned 32-bit little-endian
+
+       u8 (ub)
+	   PCM unsigned 8-bit
+
+       vidc
+	   PCM Archimedes VIDC
+
+   MPEG-1/MPEG-2 program stream muxers
+       This section covers formats belonging to the MPEG-1 and MPEG-2 Systems
+       family.
+
+       The MPEG-1 Systems format (also known as ISO/IEEC 11172-1 or MPEG-1
+       program stream) has been adopted for the format of media track stored
+       in VCD (Video Compact Disc).
+
+       The MPEG-2 Systems standard (also known as ISO/IEEC 13818-1) covers two
+       containers formats, one known as transport stream and one known as
+       program stream; only the latter is covered here.
+
+       The MPEG-2 program stream format (also known as VOB due to the
+       corresponding file extension) is an extension of MPEG-1 program stream:
+       in addition to support different codecs for the audio and video
+       streams, it also stores subtitles and navigation metadata.  MPEG-2
+       program stream has been adopted for storing media streams in SVCD and
+       DVD storage devices.
+
+       This section comprises the following muxers.
+
+       mpeg (mpg,mpeg)
+	   MPEG-1 Systems / MPEG-1 program stream muxer.
+
+       vcd MPEG-1 Systems / MPEG-1 program stream (VCD) muxer.
+
+	   This muxer can be used to generate tracks in the format accepted by
+	   the VCD (Video Compact Disc) storage devices.
+
+	   It is the same as the mpeg muxer with a few differences.
+
+       vob MPEG-2 program stream (VOB) muxer.
+
+       dvd MPEG-2 program stream (DVD VOB) muxer.
+
+	   This muxer can be used to generate tracks in the format accepted by
+	   the DVD (Digital Versatile Disc) storage devices.
+
+	   This is the same as the vob muxer with a few differences.
+
+       svcd (vob)
+	   MPEG-2 program stream (SVCD VOB) muxer.
+
+	   This muxer can be used to generate tracks in the format accepted by
+	   the SVCD (Super Video Compact Disc) storage devices.
+
+	   This is the same as the vob muxer with a few differences.
+
+       Options
+
+       muxrate rate
+	   Set user-defined mux rate expressed as a number of bits/s. If not
+	   specied the automatically computed mux rate is employed. Default
+	   value is 0.
+
+       preload delay
+	   Set initial demux-decode delay in microseconds. Default value is
+	   500000.
+
+   MOV/MPEG-4/ISOMBFF muxers
+       This section covers formats belonging to the QuickTime / MOV family,
+       including the MPEG-4 Part 14 format and ISO base media file format
+       (ISOBMFF). These formats share a common structure based on the ISO base
+       media file format (ISOBMFF).
+
+       The MOV format was originally developed for use with Apple QuickTime.
+       It was later used as the basis for the MPEG-4 Part 1 (later Part 14)
+       format, also known as ISO/IEC 14496-1. That format was then generalized
+       into ISOBMFF, also named MPEG-4 Part 12 format, ISO/IEC 14496-12, or
+       ISO/IEC 15444-12.
+
+       It comprises the following muxers.
+
+       3gp Third Generation Partnership Project (3GPP) format for 3G UMTS
+	   multimedia services
+
+       3g2 Third Generation Partnership Project 2 (3GP2 or 3GPP2) format for
+	   3G CDMA2000 multimedia services, similar to 3gp with extensions and
+	   limitations
+
+       f4v Adobe Flash Video format
+
+       ipod
+	   MPEG-4 audio file format, as MOV/MP4 but limited to contain only
+	   audio streams, typically played with the Apple ipod device
+
+       ismv
+	   Microsoft IIS (Internet Information Services) Smooth Streaming
+	   Audio/Video (ISMV or ISMA) format. This is based on MPEG-4 Part 14
+	   format with a few incompatible variants, used to stream media files
+	   for the Microsoft IIS server.
+
+       mov QuickTime player format identified by the ".mov" extension
+
+       mp4 MP4 or MPEG-4 Part 14 format
+
+       psp PlayStation Portable MP4/MPEG-4 Part 14 format variant. This is
+	   based on MPEG-4 Part 14 format with a few incompatible variants,
+	   used to play files on PlayStation devices.
+
+       Fragmentation
+
+       The mov, mp4, and ismv muxers support fragmentation. Normally, a
+       MOV/MP4 file has all the metadata about all packets stored in one
+       location.
+
+       This data is usually written at the end of the file, but it can be
+       moved to the start for better playback by adding "+faststart" to the
+       "-movflags", or using the qt-faststart tool).
+
+       A fragmented file consists of a number of fragments, where packets and
+       metadata about these packets are stored together. Writing a fragmented
+       file has the advantage that the file is decodable even if the writing
+       is interrupted (while a normal MOV/MP4 is undecodable if it is not
+       properly finished), and it requires less memory when writing very long
+       files (since writing normal MOV/MP4 files stores info about every
+       single packet in memory until the file is closed). The downside is that
+       it is less compatible with other applications.
+
+       Fragmentation is enabled by setting one of the options that define how
+       to cut the file into fragments:
+
+       frag_duration
+       frag_size
+       min_frag_duration
+       movflags +frag_keyframe
+       movflags +frag_custom
+
+       If more than one condition is specified, fragments are cut when one of
+       the specified conditions is fulfilled. The exception to this is the
+       option min_frag_duration, which has to be fulfilled for any of the
+       other conditions to apply.
+
+       Options
+
+       brand brand_string
+	   Override major brand.
+
+       empty_hdlr_name bool
+	   Enable to skip writing the name inside a "hdlr" box.  Default is
+	   "false".
+
+       encryption_key key
+	   set the media encryption key in hexadecimal format
+
+       encryption_kid kid
+	   set the media encryption key identifier in hexadecimal format
+
+       encryption_scheme scheme
+	   configure the encryption scheme, allowed values are none, and cenc-
+	   aes-ctr
+
+       frag_duration duration
+	   Create fragments that are duration microseconds long.
+
+       frag_interleave	number
+	   Interleave samples within fragments (max number of consecutive
+	   samples, lower is tighter interleaving, but with more overhead. It
+	   is set to 0 by default.
+
+       frag_size size
+	   create fragments that contain up to size bytes of payload data
+
+       iods_audio_profile profile
+	   specify iods number for the audio profile atom (from -1 to 255),
+	   default is "-1"
+
+       iods_video_profile profile
+	   specify iods number for the video profile atom (from -1 to 255),
+	   default is "-1"
+
+       ism_lookahead num_entries
+	   specify number of lookahead entries for ISM files (from 0 to 255),
+	   default is 0
+
+       min_frag_duration duration
+	   do not create fragments that are shorter than duration microseconds
+	   long
+
+       moov_size bytes
+	   Reserves space for the moov atom at the beginning of the file
+	   instead of placing the moov atom at the end. If the space reserved
+	   is insufficient, muxing will fail.
+
+       mov_gamma gamma
+	   specify gamma value for gama atom (as a decimal number from 0 to
+	   10), default is 0.0, must be set together with "+ movflags"
+
+       movflags flags
+	   Set various muxing switches. The following flags can be used:
+
+	   cmaf
+	       write CMAF (Common Media Application Format) compatible
+	       fragmented MP4 output
+
+	   dash
+	       write DASH (Dynamic Adaptive Streaming over HTTP) compatible
+	       fragmented MP4 output
+
+	   default_base_moof
+	       Similarly to the omit_tfhd_offset flag, this flag avoids
+	       writing the absolute base_data_offset field in tfhd atoms, but
+	       does so by using the new default-base-is-moof flag instead.
+	       This flag is new from 14496-12:2012. This may make the
+	       fragments easier to parse in certain circumstances (avoiding
+	       basing track fragment location calculations on the implicit end
+	       of the previous track fragment).
+
+	   delay_moov
+	       delay writing the initial moov until the first fragment is cut,
+	       or until the first fragment flush
+
+	   disable_chpl
+	       Disable Nero chapter markers (chpl atom). Normally, both Nero
+	       chapters and a QuickTime chapter track are written to the file.
+	       With this option set, only the QuickTime chapter track will be
+	       written. Nero chapters can cause failures when the file is
+	       reprocessed with certain tagging programs, like mp3Tag 2.61a
+	       and iTunes 11.3, most likely other versions are affected as
+	       well.
+
+	   faststart
+	       Run a second pass moving the index (moov atom) to the beginning
+	       of the file. This operation can take a while, and will not work
+	       in various situations such as fragmented output, thus it is not
+	       enabled by default.
+
+	   frag_custom
+	       Allow the caller to manually choose when to cut fragments, by
+	       calling "av_write_frame(ctx, NULL)" to write a fragment with
+	       the packets written so far. (This is only useful with other
+	       applications integrating libavformat, not from ffmpeg.)
+
+	   frag_discont
+	       signal that the next fragment is discontinuous from earlier
+	       ones
+
+	   frag_every_frame
+	       fragment at every frame
+
+	   frag_keyframe
+	       start a new fragment at each video keyframe
+
+	   global_sidx
+	       write a global sidx index at the start of the file
+
+	   isml
+	       create a live smooth streaming feed (for pushing to a
+	       publishing point)
+
+	   negative_cts_offsets
+	       Enables utilization of version 1 of the CTTS box, in which the
+	       CTS offsets can be negative. This enables the initial sample to
+	       have DTS/CTS of zero, and reduces the need for edit lists for
+	       some cases such as video tracks with B-frames. Additionally,
+	       eases conformance with the DASH-IF interoperability guidelines.
+
+	       This option is implicitly set when writing ismv (Smooth
+	       Streaming) files.
+
+	   omit_tfhd_offset
+	       Do not write any absolute base_data_offset in tfhd atoms. This
+	       avoids tying fragments to absolute byte positions in the
+	       file/streams.
+
+	   prefer_icc
+	       If writing colr atom prioritise usage of ICC profile if it
+	       exists in stream packet side data.
+
+	   rtphint
+	       add RTP hinting tracks to the output file
+
+	   separate_moof
+	       Write a separate moof (movie fragment) atom for each track.
+	       Normally, packets for all tracks are written in a moof atom
+	       (which is slightly more efficient), but with this option set,
+	       the muxer writes one moof/mdat pair for each track, making it
+	       easier to separate tracks.
+
+	   skip_sidx
+	       Skip writing of sidx atom. When bitrate overhead due to sidx
+	       atom is high, this option could be used for cases where sidx
+	       atom is not mandatory. When the global_sidx flag is enabled,
+	       this option is ignored.
+
+	   skip_trailer
+	       skip writing the mfra/tfra/mfro trailer for fragmented files
+
+	   use_metadata_tags
+	       use mdta atom for metadata
+
+	   write_colr
+	       write colr atom even if the color info is unspecified. This
+	       flag is experimental, may be renamed or changed, do not use
+	       from scripts.
+
+	   write_gama
+	       write deprecated gama atom
+
+       movie_timescale scale
+	   Set the timescale written in the movie header box ("mvhd").	Range
+	   is 1 to INT_MAX. Default is 1000.
+
+       rtpflags flags
+	   Add RTP hinting tracks to the output file.
+
+	   The following flags can be used:
+
+	   h264_mode0
+	       use mode 0 for H.264 in RTP
+
+	   latm
+	       use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC
+
+	   rfc2190
+	       use RFC 2190 packetization instead of RFC 4629 for H.263
+
+	   send_bye
+	       send RTCP BYE packets when finishing
+
+	   skip_rtcp
+	       do not send RTCP sender reports
+
+       skip_iods bool
+	   skip writing iods atom (default value is "true")
+
+       use_editlist bool
+	   use edit list (default value is "auto")
+
+       use_stream_ids_as_track_ids bool
+	   use stream ids as track ids (default value is "false")
+
+       video_track_timescale scale
+	   Set the timescale used for video tracks. Range is 0 to INT_MAX. If
+	   set to 0, the timescale is automatically set based on the native
+	   stream time base. Default is 0.
+
+       write_btrt bool
+	   Force or disable writing bitrate box inside stsd box of a track.
+	   The box contains decoding buffer size (in bytes), maximum bitrate
+	   and average bitrate for the track. The box will be skipped if none
+	   of these values can be computed.  Default is "-1" or "auto", which
+	   will write the box only in MP4 mode.
+
+       write_prft option
+	   Write producer time reference box (PRFT) with a specified time
+	   source for the NTP field in the PRFT box. Set value as wallclock to
+	   specify timesource as wallclock time and pts to specify timesource
+	   as input packets' PTS values.
+
+       write_tmcd bool
+	   Specify "on" to force writing a timecode track, "off" to disable it
+	   and "auto" to write a timecode track only for mov and mp4 output
+	   (default).
+
+	   Setting value to pts is applicable only for a live encoding use
+	   case, where PTS values are set as as wallclock time at the source.
+	   For example, an encoding use case with decklink capture source
+	   where video_pts and audio_pts are set to abs_wallclock.
+
+       Examples
+
+       o   Push Smooth Streaming content in real time to a publishing point on
+	   IIS with the ismv muxer using ffmpeg:
+
+		   ffmpeg -re <<normal input/transcoding options>> -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)
+
+   a64
+       A64 Commodore 64 video muxer.
+
+       This muxer accepts a single "a64_multi" or "a64_multi5" codec video
+       stream.
+
+   ac4
+       Raw AC-4 audio muxer.
+
+       This muxer accepts a single "ac4" audio stream.
+
+       Options
+
+       write_crc bool
+	   when enabled, write a CRC checksum for each packet to the output,
+	   default is "false"
+
+   adts
+       Audio Data Transport Stream muxer.
+
+       It accepts a single AAC stream.
+
+       Options
+
+       write_id3v2 bool
+	   Enable to write ID3v2.4 tags at the start of the stream. Default is
+	   disabled.
+
+       write_apetag bool
+	   Enable to write APE tags at the end of the stream. Default is
+	   disabled.
+
+       write_mpeg2 bool
+	   Enable to set MPEG version bit in the ADTS frame header to 1 which
+	   indicates MPEG-2. Default is 0, which indicates MPEG-4.
+
+   aea
+       MD STUDIO audio muxer.
+
+       This muxer accepts a single ATRAC1 audio stream with either one or two
+       channels and a sample rate of 44100Hz.
+
+       As AEA supports storing the track title, this muxer will also write the
+       title from stream's metadata to the container.
+
+   aiff
+       Audio Interchange File Format muxer.
+
+       Options
+
+       write_id3v2 bool
+	   Enable ID3v2 tags writing when set to 1. Default is 0 (disabled).
+
+       id3v2_version bool
+	   Select ID3v2 version to write. Currently only version 3 and 4 (aka.
+	   ID3v2.3 and ID3v2.4) are supported. The default is version 4.
+
+   alp
+       High Voltage Software's Lego Racers game audio muxer.
+
+       It accepts a single ADPCM_IMA_ALP stream with no more than 2 channels
+       and a sample rate not greater than 44100 Hz.
+
+       Extensions: "tun", "pcm"
+
+       Options
+
+       type type
+	   Set file type.
+
+	   type accepts the following values:
+
+	   tun Set file type as music. Must have a sample rate of 22050 Hz.
+
+	   pcm Set file type as sfx.
+
+	   auto
+	       Set file type as per output file extension. ".pcm" results in
+	       type "pcm" else type "tun" is set. (default)
+
+   amr
+       3GPP AMR (Adaptive Multi-Rate) audio muxer.
+
+       It accepts a single audio stream containing an AMR NB stream.
+
+   amv
+       AMV (Actions Media Video) format muxer.
+
+   apm
+       Ubisoft Rayman 2 APM audio muxer.
+
+       It accepts a single ADPCM IMA APM audio stream.
+
+   apng
+       Animated Portable Network Graphics muxer.
+
+       It accepts a single APNG video stream.
+
+       Options
+
+       final_delay delay
+	   Force a delay expressed in seconds after the last frame of each
+	   repetition. Default value is 0.0.
+
+       plays repetitions
+	   specify how many times to play the content, 0 causes an infinte
+	   loop, with 1 there is no loop
+
+       Examples
+
+       o   Use ffmpeg to generate an APNG output with 2 repetitions, and with
+	   a delay of half a second after the first repetition:
+
+		   ffmpeg -i INPUT -final_delay 0.5 -plays 2 out.apng
+
+   argo_asf
+       Argonaut Games ASF audio muxer.
+
+       It accepts a single ADPCM audio stream.
+
+       Options
+
+       version_major version
+	   override file major version, specified as an integer, default value
+	   is 2
+
+       version_minor version
+	   override file minor version, specified as an integer, default value
+	   is 1
+
+       name name
+	   Embed file name into file, if not specified use the output file
+	   name. The name is truncated to 8 characters.
+
+   argo_cvg
+       Argonaut Games CVG audio muxer.
+
+       It accepts a single one-channel ADPCM 22050Hz audio stream.
+
+       The loop and reverb options set the corresponding flags in the header
+       which can be later retrieved to process the audio stream accordingly.
+
+       Options
+
+       skip_rate_check bool
+	   skip sample rate check (default is "false")
+
+       loop bool
+	   set loop flag (default is "false")
+
+       reverb boolean
+	   set reverb flag (default is "true")
+
+   asf, asf_stream
+       Advanced / Active Systems (or Streaming) Format audio muxer.
+
+       The asf_stream variant should be selected for streaming.
+
+       Note that Windows Media Audio (wma) and Windows Media Video (wmv) use
+       this muxer too.
+
+       Options
+
+       packet_size size
+	   Set the muxer packet size as a number of bytes. By tuning this
+	   setting you may reduce data fragmentation or muxer overhead
+	   depending on your source. Default value is 3200, minimum is 100,
+	   maximum is "64Ki".
+
+   ass
+       ASS/SSA (SubStation Alpha) subtitles muxer.
+
+       It accepts a single ASS subtitles stream.
+
+       Options
+
+       ignore_readorder bool
+	   Write dialogue events immediately, even if they are out-of-order,
+	   default is "false", otherwise they are cached until the expected
+	   time event is found.
+
+   ast
+       AST (Audio Stream) muxer.
+
+       This format is used to play audio on some Nintendo Wii games.
+
+       It accepts a single audio stream.
+
+       The loopstart and loopend options can be used to define a section of
+       the file to loop for players honoring such options.
+
+       Options
+
+       loopstart start
+	   Specify loop start position expressesd in milliseconds, from "-1"
+	   to "INT_MAX", in case "-1" is set then no loop is specified
+	   (default -1) and the loopend value is ignored.
+
+       loopend end
+	   Specify loop end position expressed in milliseconds, from 0 to
+	   "INT_MAX", default is 0, in case 0 is set it assumes the total
+	   stream duration.
+
+   au
+       SUN AU audio muxer.
+
+       It accepts a single audio stream.
+
+   avi
+       Audio Video Interleaved muxer.
+
+       AVI is a proprietary format developed by Microsoft, and later formally
+       specified through the Open DML specification.
+
+       Because of differences in players implementations, it might be required
+       to set some options to make sure that the generated output can be
+       correctly played by the target player.
+
+       Options
+
+       flipped_raw_rgb bool
+	   If set to "true", store positive height for raw RGB bitmaps, which
+	   indicates bitmap is stored bottom-up. Note that this option does
+	   not flip the bitmap which has to be done manually beforehand, e.g.
+	   by using the vflip filter. Default is "false" and indicates bitmap
+	   is stored top down.
+
+       reserve_index_space size
+	   Reserve the specified amount of bytes for the OpenDML master index
+	   of each stream within the file header. By default additional master
+	   indexes are embedded within the data packets if there is no space
+	   left in the first master index and are linked together as a chain
+	   of indexes. This index structure can cause problems for some use
+	   cases, e.g. third-party software strictly relying on the OpenDML
+	   index specification or when file seeking is slow. Reserving enough
+	   index space in the file header avoids these problems.
+
+	   The required index space depends on the output file size and should
+	   be about 16 bytes per gigabyte. When this option is omitted or set
+	   to zero the necessary index space is guessed.
+
+	   Default value is 0.
+
+       write_channel_mask bool
+	   Write the channel layout mask into the audio stream header.
+
+	   This option is enabled by default. Disabling the channel mask can
+	   be useful in specific scenarios, e.g. when merging multiple audio
+	   streams into one for compatibility with software that only supports
+	   a single audio stream in AVI (see the "amerge" section in the
+	   ffmpeg-filters manual).
+
+   avif
+       AV1 (Alliance for Open Media Video codec 1) image format muxer.
+
+       This muxers stores images encoded using the AV1 codec.
+
+       It accepts one or two video streams. In case two video streams are
+       provided, the second one shall contain a single plane storing the alpha
+       mask.
+
+       In case more than one image is provided, the generated output is
+       considered an animated AVIF and the number of loops can be specified
+       with the loop option.
+
+       This is based on the specification by Alliance for Open Media at url
+       <https://aomediacodec.github.io/av1-avif>.
+
+       Options
+
+       loop count
+	   number of times to loop an animated AVIF, 0 specify an infinite
+	   loop, default is 0
+
+       movie_timescale timescale
+	   Set the timescale written in the movie header box ("mvhd").	Range
+	   is 1 to INT_MAX. Default is 1000.
+
+   avm2
+       ShockWave Flash (SWF) / ActionScript Virtual Machine 2 (AVM2) format
+       muxer.
+
+       It accepts one audio stream, one video stream, or both.
+
+   bit
+       G.729 (.bit) file format muxer.
+
+       It accepts a single G.729 audio stream.
+
+   caf
+       Apple CAF (Core Audio Format) muxer.
+
+       It accepts a single audio stream.
+
+   codec2
+       Codec2 audio audio muxer.
+
+       It accepts a single codec2 audio stream.
+
+   chromaprint
+       Chromaprint fingerprinter muxers.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-chromaprint".
+
+       This muxer feeds audio data to the Chromaprint library, which generates
+       a fingerprint for the provided audio data. See:
+       <https://acoustid.org/chromaprint>
+
+       It takes a single signed native-endian 16-bit raw audio stream of at
+       most 2 channels.
+
+       Options
+
+       algorithm version
+	   Select version of algorithm to fingerprint with. Range is 0 to 4.
+	   Version 3 enables silence detection. Default is 1.
+
+       fp_format format
+	   Format to output the fingerprint as. Accepts the following options:
+
+	   base64
+	       Base64 compressed fingerprint (default)
+
+	   compressed
+	       Binary compressed fingerprint
+
+	   raw Binary raw fingerprint
+
+       silence_threshold threshold
+	   Threshold for detecting silence. Range is from "-1" to 32767, where
+	   "-1" disables silence detection. Silence detection can only be used
+	   with version 3 of the algorithm.
+
+	   Silence detection must be disabled for use with the AcoustID
+	   service. Default is "-1".
+
+   crc
+       CRC (Cyclic Redundancy Check) muxer.
+
+       This muxer computes and prints the Adler-32 CRC of all the input audio
+       and video frames. By default audio frames are converted to signed
+       16-bit raw audio and video frames to raw video before computing the
+       CRC.
+
+       The output of the muxer consists of a single line of the form:
+       CRC=0xCRC, where CRC is a hexadecimal number 0-padded to 8 digits
+       containing the CRC for all the decoded input frames.
+
+       See also the framecrc muxer.
+
+       Examples
+
+       o   Use ffmpeg to compute the CRC of the input, and store it in the
+	   file out.crc:
+
+		   ffmpeg -i INPUT -f crc out.crc
+
+       o   Use ffmpeg to print the CRC to stdout with the command:
+
+		   ffmpeg -i INPUT -f crc -
+
+       o   You can select the output format of each frame with ffmpeg by
+	   specifying the audio and video codec and format. For example, to
+	   compute the CRC of the input audio converted to PCM unsigned 8-bit
+	   and the input video converted to MPEG-2 video, use the command:
+
+		   ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f crc -
+
+   dash
+       Dynamic Adaptive Streaming over HTTP (DASH) muxer.
+
+       This muxer creates segments and manifest files according to the MPEG-
+       DASH standard ISO/IEC 23009-1:2014 and following standard updates.
+
+       For more information see:
+
+       o   ISO DASH Specification:
+	   <http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip>
+
+       o   WebM DASH Specification:
+	   <https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification>
+
+       This muxer creates an MPD (Media Presentation Description) manifest
+       file and segment files for each stream. Segment files are placed in the
+       same directory of the MPD manifest file.
+
+       The segment filename might contain pre-defined identifiers used in the
+       manifest "SegmentTemplate" section as defined in section 5.3.9.4.4 of
+       the standard.
+
+       Available identifiers are "$RepresentationID$", "$Number$",
+       "$Bandwidth$", and "$Time$". In addition to the standard identifiers,
+       an ffmpeg-specific "$ext$" identifier is also supported. When
+       specified, ffmpeg will replace "$ext$" in the file name with muxing
+       format's extensions such as "mp4", "webm" etc.
+
+       Options
+
+       adaptation_sets adaptation_sets
+	   Assign streams to adaptation sets, specified in the MPD manifest
+	   "AdaptationSets" section.
+
+	   An adaptation set contains a set of one or more streams accessed as
+	   a single subset, e.g. corresponding streams encoded at different
+	   size selectable by the user depending on the available bandwidth,
+	   or to different audio streams with a different language.
+
+	   Each adaptation set is specified with the syntax:
+
+		   id=<index>,streams=<streams>
+
+	   where index must be a numerical index, and streams is a sequence of
+	   ","-separated stream indices. Multiple adaptation sets can be
+	   specified, separated by spaces.
+
+	   To map all video (or audio) streams to an adaptation set, "v" (or
+	   "a") can be used as stream identifier instead of IDs.
+
+	   When no assignment is defined, this defaults to an adaptation set
+	   for each stream.
+
+	   The following optional fields can also be specified:
+
+	   descriptor
+	       Define the descriptor as defined by ISO/IEC
+	       23009-1:2014/Amd.2:2015.
+
+	       For example:
+
+		       <SupplementalProperty schemeIdUri=\"urn:mpeg:dash:srd:2014\" value=\"0,0,0,1,1,2,2\"/>
+
+	       The descriptor string should be a self-closing XML tag.
+
+	   frag_duration
+	       Override the global fragment duration specified with the
+	       frag_duration option.
+
+	   frag_type
+	       Override the global fragment type specified with the frag_type
+	       option.
+
+	   seg_duration
+	       Override the global segment duration specified with the
+	       seg_duration option.
+
+	   trick_id
+	       Mark an adaptation set as containing streams meant to be used
+	       for Trick Mode for the referenced adaptation set.
+
+	   A few examples of possible values for the adaptation_sets option
+	   follow:
+
+		   id=0,seg_duration=2,frag_duration=1,frag_type=duration,streams=v id=1,seg_duration=2,frag_type=none,streams=a
+
+		   id=0,seg_duration=2,frag_type=none,streams=0 id=1,seg_duration=10,frag_type=none,trick_id=0,streams=1
+
+       dash_segment_type type
+	   Set DASH segment files type.
+
+	   Possible values:
+
+	   auto
+	       The dash segment files format will be selected based on the
+	       stream codec. This is the default mode.
+
+	   mp4 the dash segment files will be in ISOBMFF/MP4 format
+
+	   webm
+	       the dash segment files will be in WebM format
+
+       extra_window_size size
+	   Set the maximum number of segments kept outside of the manifest
+	   before removing from disk.
+
+       format_options options_list
+	   Set container format (mp4/webm) options using a ":"-separated list
+	   of key=value parameters. Values containing ":" special characters
+	   must be escaped.
+
+       frag_duration duration
+	   Set the length in seconds of fragments within segments, fractional
+	   value can also be set.
+
+       frag_type type
+	   Set the type of interval for fragmentation.
+
+	   Possible values:
+
+	   auto
+	       set one fragment per segment
+
+	   every_frame
+	       fragment at every frame
+
+	   duration
+	       fragment at specific time intervals
+
+	   pframes
+	       fragment at keyframes and following P-Frame reordering (Video
+	       only, experimental)
+
+       global_sidx bool
+	   Write global "SIDX" atom. Applicable only for single file, mp4
+	   output, non-streaming mode.
+
+       hls_master_name file_name
+	   HLS master playlist name. Default is master.m3u8.
+
+       hls_playlist bool
+	   Generate HLS playlist files. The master playlist is generated with
+	   filename specified by the hls_master_name option. One media
+	   playlist file is generated for each stream with filenames
+	   media_0.m3u8, media_1.m3u8, etc.
+
+       http_opts http_opts
+	   Specify a list of ":"-separated key=value options to pass to the
+	   underlying HTTP protocol. Applicable only for HTTP output.
+
+       http_persistent bool
+	   Use persistent HTTP connections. Applicable only for HTTP output.
+
+       http_user_agent user_agent
+	   Override User-Agent field in HTTP header. Applicable only for HTTP
+	   output.
+
+       ignore_io_errors bool
+	   Ignore IO errors during open and write. Useful for long-duration
+	   runs with network output. This is disabled by default.
+
+       index_correction bool
+	   Enable or disable segment index correction logic. Applicable only
+	   when use_template is enabled and use_timeline is disabled. This is
+	   disabled by default.
+
+	   When enabled, the logic monitors the flow of segment indexes. If a
+	   streams's segment index value is not at the expected real time
+	   position, then the logic corrects that index value.
+
+	   Typically this logic is needed in live streaming use cases. The
+	   network bandwidth fluctuations are common during long run
+	   streaming. Each fluctuation can cause the segment indexes fall
+	   behind the expected real time position.
+
+       init_seg_name init_name
+	   DASH-templated name to use for the initialization segment. Default
+	   is "init-stream$RepresentationID$.$ext$". "$ext$" is replaced with
+	   the file name extension specific for the segment format.
+
+       ldash bool
+	   Enable Low-latency Dash by constraining the presence and values of
+	   some elements. This is disabled by default.
+
+       lhls bool
+	   Enable Low-latency HLS (LHLS). Add "#EXT-X-PREFETCH" tag with
+	   current segment's URI. hls.js player folks are trying to
+	   standardize an open LHLS spec. The draft spec is available at
+	   <https://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md>.
+
+	   This option tries to comply with the above open spec. It enables
+	   streaming and hls_playlist options automatically.  This is an
+	   experimental feature.
+
+	   Note: This is not Apple's version LHLS. See
+	   <https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis>
+
+       master_m3u8_publish_rate segment_intervals_count
+	   Publish master playlist repeatedly every after specified number of
+	   segment intervals.
+
+       max_playback_rate rate
+	   Set the maximum playback rate indicated as appropriate for the
+	   purposes of automatically adjusting playback latency and buffer
+	   occupancy during normal playback by clients.
+
+       media_seg_name segment_name
+	   DASH-templated name to use for the media segments. Default is
+	   "chunk-stream$RepresentationID$-$Number%05d$.$ext$". "$ext$" is
+	   replaced with the file name extension specific for the segment
+	   format.
+
+       method method
+	   Use the given HTTP method to create output files. Generally set to
+	   "PUT" or "POST".
+
+       min_playback_rate rate
+	   Set the minimum playback rate indicated as appropriate for the
+	   purposes of automatically adjusting playback latency and buffer
+	   occupancy during normal playback by clients.
+
+       mpd_profile flags
+	   Set one or more MPD manifest profiles.
+
+	   Possible values:
+
+	   dash
+	       MPEG-DASH ISO Base media file format live profile
+
+	   dvb_dash
+	       DVB-DASH profile
+
+	   Default value is "dash".
+
+       remove_at_exit bool
+	   Enable or disable removal of all segments when finished. This is
+	   disabled by default.
+
+       seg_duration duration
+	   Set the segment length in seconds (fractional value can be set).
+	   The value is treated as average segment duration when the
+	   use_template option is enabled and the use_timeline option is
+	   disabled and as minimum segment duration for all the other use
+	   cases.
+
+	   Default value is 5.
+
+       single_file bool
+	   Enable or disable storing all segments in one file, accessed using
+	   byte ranges. This is disabled by default.
+
+	   The name of the single file can be specified with the
+	   single_file_name option, if not specified assume the basename of
+	   the manifest file with the output format extension.
+
+       single_file_name file_name
+	   DASH-templated name to use for the manifest "baseURL" element.
+	   Imply that the single_file option is set to true. In the template,
+	   "$ext$" is replaced with the file name extension specific for the
+	   segment format.
+
+       streaming bool
+	   Enable or disable chunk streaming mode of output. In chunk
+	   streaming mode, each frame will be a "moof" fragment which forms a
+	   chunk. This is disabled by default.
+
+       target_latency target_latency
+	   Set an intended target latency in seconds for serving (fractional
+	   value can be set). Applicable only when the streaming and
+	   write_prft options are enabled. This is an informative fields
+	   clients can use to measure the latency of the service.
+
+       timeout timeout
+	   Set timeout for socket I/O operations expressed in seconds
+	   (fractional value can be set). Applicable only for HTTP output.
+
+       update_period period
+	   Set the MPD update period, for dynamic content. The unit is second.
+	   If set to 0, the period is automatically computed.
+
+	   Default value is 0.
+
+       use_template bool
+	   Enable or disable use of "SegmentTemplate" instead of "SegmentList"
+	   in the manifest. This is enabled by default.
+
+       use_timeline bool
+	   Enable or disable use of "SegmentTimeline" within the
+	   "SegmentTemplate" manifest section. This is enabled by default.
+
+       utc_timing_url url
+	   URL of the page that will return the UTC timestamp in ISO format,
+	   for example "https://time.akamai.com/?iso"
+
+       window_size size
+	   Set the maximum number of segments kept in the manifest, discard
+	   the oldest one. This is useful for live streaming.
+
+	   If the value is 0, all segments are kept in the manifest. Default
+	   value is 0.
+
+       write_prft write_prft
+	   Write Producer Reference Time elements on supported streams. This
+	   also enables writing prft boxes in the underlying muxer. Applicable
+	   only when the utc_url option is enabled. It is set to auto by
+	   default, in which case the muxer will attempt to enable it only in
+	   modes that require it.
+
+       Example
+
+       Generate a DASH output reading from an input source in realtime using
+       ffmpeg.
+
+       Two multimedia streams are generated from the input file, both
+       containing a video stream encoded through libx264, and an audio stream
+       encoded with libfdk_aac. The first multimedia stream contains video
+       with a bitrate of 800k and audio at the default rate, the second with
+       video scaled to 320x170 pixels at 300k and audio resampled at 22005 Hz.
+
+       The window_size option keeps only the latest 5 segments with the
+       default duration of 5 seconds.
+
+	       ffmpeg -re -i <input> -map 0 -map 0 -c:a libfdk_aac -c:v libx264 \
+	       -b:v:0 800k -profile:v:0 main \
+	       -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline -ar:a:1 22050 \
+	       -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 \
+	       -use_timeline 1 -use_template 1 -window_size 5 \
+	       -adaptation_sets "id=0,streams=v id=1,streams=a" \
+	       -f dash /path/to/out.mpd
+
+   daud
+       D-Cinema audio muxer.
+
+       It accepts a single 6-channels audio stream resampled at 96000 Hz
+       encoded with the pcm_24daud codec.
+
+       Example
+
+       Use ffmpeg to mux input audio to a 5.1 channel layout resampled at
+       96000Hz:
+
+	       ffmpeg -i INPUT -af aresample=96000,pan=5.1 slow.302
+
+       For ffmpeg versions before 7.0 you might have to use the asetnsamples
+       filter to limit the muxed packet size, because this format does not
+       support muxing packets larger than 65535 bytes (3640 samples). For
+       newer ffmpeg versions audio is automatically packetized to 36000 byte
+       (2000 sample) packets.
+
+   dv
+       DV (Digital Video) muxer.
+
+       It accepts exactly one dvvideo video stream and at most two pcm_s16
+       audio streams. More constraints are defined by the property of the
+       video, which must correspond to a DV video supported profile, and on
+       the framerate.
+
+       Example
+
+       Use ffmpeg to convert the input:
+
+	       ffmpeg -i INPUT -s:v 720x480 -pix_fmt yuv411p -r 29.97 -ac 2 -ar 48000 -y out.dv
+
+   ffmetadata
+       FFmpeg metadata muxer.
+
+       This muxer writes the streams metadata in the ffmetadata format.
+
+       See the Metadata chapter for information about the format.
+
+       Example
+
+       Use ffmpeg to extract metadata from an input file to a metadata.ffmeta
+       file in ffmetadata format:
+
+	       ffmpeg -i INPUT -f ffmetadata metadata.ffmeta
+
+   fifo
+       FIFO (First-In First-Out) muxer.
+
+       The fifo pseudo-muxer allows the separation of encoding and muxing by
+       using a first-in-first-out queue and running the actual muxer in a
+       separate thread.
+
+       This is especially useful in combination with the tee muxer and can be
+       used to send data to several destinations with different
+       reliability/writing speed/latency.
+
+       The target muxer is either selected from the output name or specified
+       through the fifo_format option.
+
+       The behavior of the fifo muxer if the queue fills up or if the output
+       fails (e.g. if a packet cannot be written to the output) is selectable:
+
+       o   Output can be transparently restarted with configurable delay
+	   between retries based on real time or time of the processed stream.
+
+       o   Encoding can be blocked during temporary failure, or continue
+	   transparently dropping packets in case the FIFO queue fills up.
+
+       API users should be aware that callback functions
+       ("interrupt_callback", "io_open" and "io_close") used within its
+       "AVFormatContext" must be thread-safe.
+
+       Options
+
+       attempt_recovery bool
+	   If failure occurs, attempt to recover the output. This is
+	   especially useful when used with network output, since it makes it
+	   possible to restart streaming transparently. By default this option
+	   is set to "false".
+
+       drop_pkts_on_overflow bool
+	   If set to "true", in case the fifo queue fills up, packets will be
+	   dropped rather than blocking the encoder. This makes it possible to
+	   continue streaming without delaying the input, at the cost of
+	   omitting part of the stream. By default this option is set to
+	   "false", so in such cases the encoder will be blocked until the
+	   muxer processes some of the packets and none of them is lost.
+
+       fifo_format format_name
+	   Specify the format name. Useful if it cannot be guessed from the
+	   output name suffix.
+
+       format_opts options
+	   Specify format options for the underlying muxer. Muxer options can
+	   be specified as a list of key=value pairs separated by ':'.
+
+       max_recovery_attempts count
+	   Set maximum number of successive unsuccessful recovery attempts
+	   after which the output fails permanently. By default this option is
+	   set to 0 (unlimited).
+
+       queue_size size
+	   Specify size of the queue as a number of packets. Default value is
+	   60.
+
+       recover_any_error bool
+	   If set to "true", recovery will be attempted regardless of type of
+	   the error causing the failure. By default this option is set to
+	   "false" and in case of certain (usually permanent) errors the
+	   recovery is not attempted even when the attempt_recovery option is
+	   set to "true".
+
+       recovery_wait_streamtime bool
+	   If set to "false", the real time is used when waiting for the
+	   recovery attempt (i.e. the recovery will be attempted after the
+	   time specified by the recovery_wait_time option).
+
+	   If set to "true", the time of the processed stream is taken into
+	   account instead (i.e. the recovery will be attempted after
+	   discarding the packets corresponding to the recovery_wait_time
+	   option).
+
+	   By default this option is set to "false".
+
+       recovery_wait_time duration
+	   Specify waiting time in seconds before the next recovery attempt
+	   after previous unsuccessful recovery attempt. Default value is 5.
+
+       restart_with_keyframe bool
+	   Specify whether to wait for the keyframe after recovering from
+	   queue overflow or failure. This option is set to "false" by
+	   default.
+
+       timeshift duration
+	   Buffer the specified amount of packets and delay writing the
+	   output. Note that the value of the queue_size option must be big
+	   enough to store the packets for timeshift. At the end of the input
+	   the fifo buffer is flushed at realtime speed.
+
+       Example
+
+       Use ffmpeg to stream to an RTMP server, continue processing the stream
+       at real-time rate even in case of temporary failure (network outage)
+       and attempt to recover streaming every second indefinitely:
+
+	       ffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifo_format flv \
+		 -drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 \
+		 -map 0:v -map 0:a rtmp://example.com/live/stream_name
+
+   film_cpk
+       Sega film (.cpk) muxer.
+
+       This format was used as internal format for several Sega games.
+
+       For more information regarding the Sega film file format, visit
+       <http://wiki.multimedia.cx/index.php?title=Sega_FILM>.
+
+       It accepts at maximum one cinepak or raw video stream, and at maximum
+       one audio stream.
+
+   filmstrip
+       Adobe Filmstrip muxer.
+
+       This format is used by several Adobe tools to store a generated
+       filmstrip export. It accepts a single raw video stream.
+
+   fits
+       Flexible Image Transport System (FITS) muxer.
+
+       This image format is used to store astronomical data.
+
+       For more information regarding the format, visit
+       <https://fits.gsfc.nasa.gov>.
+
+   flac
+       Raw FLAC audio muxer.
+
+       This muxer accepts exactly one FLAC audio stream. Additionally, it is
+       possible to add images with disposition attached_pic.
+
+       Options
+
+       write_header bool
+	   write the file header if set to "true", default is "true"
+
+       Example
+
+       Use ffmpeg to store the audio stream from an input file, together with
+       several pictures used with attached_pic disposition:
+
+	       ffmpeg -i INPUT -i pic1.png -i pic2.jpg -map 0:a -map 1 -map 2 -disposition:v attached_pic OUTPUT
+
+   flv
+       Adobe Flash Video Format muxer.
+
+       Options
+
+       flvflags flags
+	   Possible values:
+
+	   aac_seq_header_detect
+	       Place AAC sequence header based on audio stream data.
+
+	   no_sequence_end
+	       Disable sequence end tag.
+
+	   no_metadata
+	       Disable metadata tag.
+
+	   no_duration_filesize
+	       Disable duration and filesize in metadata when they are equal
+	       to zero at the end of stream. (Be used to non-seekable living
+	       stream).
+
+	   add_keyframe_index
+	       Used to facilitate seeking; particularly for HTTP pseudo
+	       streaming.
+
+   framecrc
+       Per-packet CRC (Cyclic Redundancy Check) testing format.
+
+       This muxer computes and prints the Adler-32 CRC for each audio and
+       video packet. By default audio frames are converted to signed 16-bit
+       raw audio and video frames to raw video before computing the CRC.
+
+       The output of the muxer consists of a line for each audio and video
+       packet of the form:
+
+	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, 0x<CRC>
+
+       CRC is a hexadecimal number 0-padded to 8 digits containing the CRC of
+       the packet.
+
+       Examples
+
+       For example to compute the CRC of the audio and video frames in INPUT,
+       converted to raw audio and video packets, and store it in the file
+       out.crc:
+
+	       ffmpeg -i INPUT -f framecrc out.crc
+
+       To print the information to stdout, use the command:
+
+	       ffmpeg -i INPUT -f framecrc -
+
+       With ffmpeg, you can select the output format to which the audio and
+       video frames are encoded before computing the CRC for each packet by
+       specifying the audio and video codec. For example, to compute the CRC
+       of each decoded input audio frame converted to PCM unsigned 8-bit and
+       of each decoded input video frame converted to MPEG-2 video, use the
+       command:
+
+	       ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
+
+       See also the crc muxer.
+
+   framehash
+       Per-packet hash testing format.
+
+       This muxer computes and prints a cryptographic hash for each audio and
+       video packet. This can be used for packet-by-packet equality checks
+       without having to individually do a binary comparison on each.
+
+       By default audio frames are converted to signed 16-bit raw audio and
+       video frames to raw video before computing the hash, but the output of
+       explicit conversions to other codecs can also be used. It uses the
+       SHA-256 cryptographic hash function by default, but supports several
+       other algorithms.
+
+       The output of the muxer consists of a line for each audio and video
+       packet of the form:
+
+	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, <hash>
+
+       hash is a hexadecimal number representing the computed hash for the
+       packet.
+
+       hash algorithm
+	   Use the cryptographic hash function specified by the string
+	   algorithm.  Supported values include "MD5", "murmur3", "RIPEMD128",
+	   "RIPEMD160", "RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
+	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
+	   and "adler32".
+
+       Examples
+
+       To compute the SHA-256 hash of the audio and video frames in INPUT,
+       converted to raw audio and video packets, and store it in the file
+       out.sha256:
+
+	       ffmpeg -i INPUT -f framehash out.sha256
+
+       To print the information to stdout, using the MD5 hash function, use
+       the command:
+
+	       ffmpeg -i INPUT -f framehash -hash md5 -
+
+       See also the hash muxer.
+
+   framemd5
+       Per-packet MD5 testing format.
+
+       This is a variant of the framehash muxer. Unlike that muxer, it
+       defaults to using the MD5 hash function.
+
+       Examples
+
+       To compute the MD5 hash of the audio and video frames in INPUT,
+       converted to raw audio and video packets, and store it in the file
+       out.md5:
+
+	       ffmpeg -i INPUT -f framemd5 out.md5
+
+       To print the information to stdout, use the command:
+
+	       ffmpeg -i INPUT -f framemd5 -
+
+       See also the framehash and md5 muxers.
+
+   gif
+       Animated GIF muxer.
+
+       Note that the GIF format has a very large time base: the delay between
+       two frames can therefore not be smaller than one centi second.
+
+       Options
+
+       loop bool
+	   Set the number of times to loop the output. Use "-1" for no loop, 0
+	   for looping indefinitely (default).
+
+       final_delay delay
+	   Force the delay (expressed in centiseconds) after the last frame.
+	   Each frame ends with a delay until the next frame. The default is
+	   "-1", which is a special value to tell the muxer to re-use the
+	   previous delay. In case of a loop, you might want to customize this
+	   value to mark a pause for instance.
+
+       Example
+
+       Encode a gif looping 10 times, with a 5 seconds delay between the
+       loops:
+
+	       ffmpeg -i INPUT -loop 10 -final_delay 500 out.gif
+
+       Note 1: if you wish to extract the frames into separate GIF files, you
+       need to force the image2 muxer:
+
+	       ffmpeg -i INPUT -c:v gif -f image2 "out%d.gif"
+
+   gxf
+       General eXchange Format (GXF) muxer.
+
+       GXF was developed by Grass Valley Group, then standardized by SMPTE as
+       SMPTE 360M and was extended in SMPTE RDD 14-2007 to include high-
+       definition video resolutions.
+
+       It accepts at most one video stream with codec mjpeg, or mpeg1video, or
+       mpeg2video, or dvvideo with resolution 512x480 or 608x576, and several
+       audio streams with rate 48000Hz and codec pcm16_le.
+
+   hash
+       Hash testing format.
+
+       This muxer computes and prints a cryptographic hash of all the input
+       audio and video frames. This can be used for equality checks without
+       having to do a complete binary comparison.
+
+       By default audio frames are converted to signed 16-bit raw audio and
+       video frames to raw video before computing the hash, but the output of
+       explicit conversions to other codecs can also be used. Timestamps are
+       ignored. It uses the SHA-256 cryptographic hash function by default,
+       but supports several other algorithms.
+
+       The output of the muxer consists of a single line of the form:
+       algo=hash, where algo is a short string representing the hash function
+       used, and hash is a hexadecimal number representing the computed hash.
+
+       hash algorithm
+	   Use the cryptographic hash function specified by the string
+	   algorithm.  Supported values include "MD5", "murmur3", "RIPEMD128",
+	   "RIPEMD160", "RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
+	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
+	   and "adler32".
+
+       Examples
+
+       To compute the SHA-256 hash of the input converted to raw audio and
+       video, and store it in the file out.sha256:
+
+	       ffmpeg -i INPUT -f hash out.sha256
+
+       To print an MD5 hash to stdout use the command:
+
+	       ffmpeg -i INPUT -f hash -hash md5 -
+
+       See also the framehash muxer.
+
+   hds
+       HTTP Dynamic Streaming (HDS) muxer.
+
+       HTTP dynamic streaming, or HDS, is an adaptive bitrate streaming method
+       developed by Adobe. HDS delivers MP4 video content over HTTP
+       connections. HDS can be used for on-demand streaming or live streaming.
+
+       This muxer creates an .f4m (Adobe Flash Media Manifest File) manifest,
+       an .abst (Adobe Bootstrap File) for each stream, and segment files in a
+       directory specified as the output.
+
+       These needs to be accessed by an HDS player throuhg HTTPS for it to be
+       able to perform playback on the generated stream.
+
+       Options
+
+       extra_window_size int
+	   number of fragments kept outside of the manifest before removing
+	   from disk
+
+       min_frag_duration microseconds
+	   minimum fragment duration (in microseconds), default value is 1
+	   second (10000000)
+
+       remove_at_exit bool
+	   remove all fragments when finished when set to "true"
+
+       window_size int
+	   number of fragments kept in the manifest, if set to a value
+	   different from 0. By default all segments are kept in the output
+	   directory.
+
+       Example
+
+       Use ffmpeg to generate HDS files to the output.hds directory in real-
+       time rate:
+
+	       ffmpeg -re -i INPUT -f hds -b:v 200k output.hds
+
+   hls
+       Apple HTTP Live Streaming muxer that segments MPEG-TS according to the
+       HTTP Live Streaming (HLS) specification.
+
+       It creates a playlist file, and one or more segment files. The output
+       filename specifies the playlist filename.
+
+       By default, the muxer creates a file for each segment produced. These
+       files have the same name as the playlist, followed by a sequential
+       number and a .ts extension.
+
+       Make sure to require a closed GOP when encoding and to set the GOP size
+       to fit your segment time constraint.
+
+       For example, to convert an input file with ffmpeg:
+
+	       ffmpeg -i in.mkv -c:v h264 -flags +cgop -g 30 -hls_time 1 out.m3u8
+
+       This example will produce the playlist, out.m3u8, and segment files:
+       out0.ts, out1.ts, out2.ts, etc.
+
+       See also the segment muxer, which provides a more generic and flexible
+       implementation of a segmenter, and can be used to perform HLS
+       segmentation.
+
+       Options
+
+       This muxer supports the following options:
+
+       hls_init_time duration
+	   Set the initial target segment length. Default value is 0.
+
+	   duration must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.
+
+	   Segment will be cut on the next key frame after this time has
+	   passed on the first m3u8 list.  After the initial playlist is
+	   filled ffmpeg will cut segments at duration equal to "hls_time"
+
+       hls_time duration
+	   Set the target segment length. Default value is 2.
+
+	   duration must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.  Segment will be
+	   cut on the next key frame after this time has passed.
+
+       hls_list_size size
+	   Set the maximum number of playlist entries. If set to 0 the list
+	   file will contain all the segments. Default value is 5.
+
+       hls_delete_threshold size
+	   Set the number of unreferenced segments to keep on disk before
+	   "hls_flags delete_segments" deletes them. Increase this to allow
+	   continue clients to download segments which were recently
+	   referenced in the playlist. Default value is 1, meaning segments
+	   older than "hls_list_size+1" will be deleted.
+
+       hls_start_number_source
+	   Start the playlist sequence number ("#EXT-X-MEDIA-SEQUENCE")
+	   according to the specified source.  Unless "hls_flags single_file"
+	   is set, it also specifies source of starting sequence numbers of
+	   segment and subtitle filenames. In any case, if "hls_flags
+	   append_list" is set and read playlist sequence number is greater
+	   than the specified start sequence number, then that value will be
+	   used as start value.
+
+	   It accepts the following values:
+
+	   generic (default)
+	       Set the starting sequence numbers according to start_number
+	       option value.
+
+	   epoch
+	       The start number will be the seconds since epoch (1970-01-01
+	       00:00:00)
+
+	   epoch_us
+	       The start number will be the microseconds since epoch
+	       (1970-01-01 00:00:00)
+
+	   datetime
+	       The start number will be based on the current date/time as
+	       YYYYmmddHHMMSS. e.g. 20161231235759.
+
+       start_number number
+	   Start the playlist sequence number ("#EXT-X-MEDIA-SEQUENCE") from
+	   the specified number when hls_start_number_source value is generic.
+	   (This is the default case.)	Unless "hls_flags single_file" is set,
+	   it also specifies starting sequence numbers of segment and subtitle
+	   filenames.  Default value is 0.
+
+       hls_allow_cache allowcache
+	   Explicitly set whether the client MAY (1) or MUST NOT (0) cache
+	   media segments.
+
+       hls_base_url baseurl
+	   Append baseurl to every entry in the playlist.  Useful to generate
+	   playlists with absolute paths.
+
+	   Note that the playlist sequence number must be unique for each
+	   segment and it is not to be confused with the segment filename
+	   sequence number which can be cyclic, for example if the wrap option
+	   is specified.
+
+       hls_segment_filename filename
+	   Set the segment filename. Unless "hls_flags single_file" is set,
+	   filename is used as a string format with the segment number:
+
+		   ffmpeg -i in.nut -hls_segment_filename 'file%03d.ts' out.m3u8
+
+	   This example will produce the playlist, out.m3u8, and segment
+	   files: file000.ts, file001.ts, file002.ts, etc.
+
+	   filename may contain full path or relative path specification, but
+	   only the file name part without any path info will be contained in
+	   the m3u8 segment list.  Should a relative path be specified, the
+	   path of the created segment files will be relative to the current
+	   working directory.  When strftime_mkdir is set, the whole expanded
+	   value of filename will be written into the m3u8 segment list.
+
+	   When "var_stream_map" is set with two or more variant streams, the
+	   filename pattern must contain the string "%v", this string
+	   specifies the position of variant stream index in the generated
+	   segment file names.
+
+		   ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     -hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8
+
+	   This example will produce the playlists segment file sets:
+	   file_0_000.ts, file_0_001.ts, file_0_002.ts, etc. and
+	   file_1_000.ts, file_1_001.ts, file_1_002.ts, etc.
+
+	   The string "%v" may be present in the filename or in the last
+	   directory name containing the file, but only in one of them.
+	   (Additionally, %v may appear multiple times in the last sub-
+	   directory or filename.) If the string %v is present in the
+	   directory name, then sub-directories are created after expanding
+	   the directory name pattern. This enables creation of segments
+	   corresponding to different variant streams in subdirectories.
+
+		   ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     -hls_segment_filename 'vs%v/file_%03d.ts' vs%v/out.m3u8
+
+	   This example will produce the playlists segment file sets:
+	   vs0/file_000.ts, vs0/file_001.ts, vs0/file_002.ts, etc. and
+	   vs1/file_000.ts, vs1/file_001.ts, vs1/file_002.ts, etc.
+
+       strftime
+	   Use strftime() on filename to expand the segment filename with
+	   localtime.  The segment number is also available in this mode, but
+	   to use it, you need to specify second_level_segment_index hls_flag
+	   and %%d will be the specifier.
+
+		   ffmpeg -i in.nut -strftime 1 -hls_segment_filename 'file-%Y%m%d-%s.ts' out.m3u8
+
+	   This example will produce the playlist, out.m3u8, and segment
+	   files: file-20160215-1455569023.ts, file-20160215-1455569024.ts,
+	   etc.  Note: On some systems/environments, the %s specifier is not
+	   available. See
+	     "strftime()" documentation.
+
+		   ffmpeg -i in.nut -strftime 1 -hls_flags second_level_segment_index -hls_segment_filename 'file-%Y%m%d-%%04d.ts' out.m3u8
+
+	   This example will produce the playlist, out.m3u8, and segment
+	   files: file-20160215-0001.ts, file-20160215-0002.ts, etc.
+
+       strftime_mkdir
+	   Used together with -strftime_mkdir, it will create all
+	   subdirectories which is expanded in filename.
+
+		   ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8
+
+	   This example will create a directory 201560215 (if it does not
+	   exist), and then produce the playlist, out.m3u8, and segment files:
+	   20160215/file-20160215-1455569023.ts,
+	   20160215/file-20160215-1455569024.ts, etc.
+
+		   ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8
+
+	   This example will create a directory hierarchy 2016/02/15 (if any
+	   of them do not exist), and then produce the playlist, out.m3u8, and
+	   segment files: 2016/02/15/file-20160215-1455569023.ts,
+	   2016/02/15/file-20160215-1455569024.ts, etc.
+
+       hls_segment_options options_list
+	   Set output format options using a :-separated list of key=value
+	   parameters. Values containing ":" special characters must be
+	   escaped.
+
+       hls_key_info_file key_info_file
+	   Use the information in key_info_file for segment encryption. The
+	   first line of key_info_file specifies the key URI written to the
+	   playlist. The key URL is used to access the encryption key during
+	   playback. The second line specifies the path to the key file used
+	   to obtain the key during the encryption process. The key file is
+	   read as a single packed array of 16 octets in binary format. The
+	   optional third line specifies the initialization vector (IV) as a
+	   hexadecimal string to be used instead of the segment sequence
+	   number (default) for encryption. Changes to key_info_file will
+	   result in segment encryption with the new key/IV and an entry in
+	   the playlist for the new key URI/IV if "hls_flags periodic_rekey"
+	   is enabled.
+
+	   Key info file format:
+
+		   <key URI>
+		   <key file path>
+		   <IV> (optional)
+
+	   Example key URIs:
+
+		   http://server/file.key
+		   /path/to/file.key
+		   file.key
+
+	   Example key file paths:
+
+		   file.key
+		   /path/to/file.key
+
+	   Example IV:
+
+		   0123456789ABCDEF0123456789ABCDEF
+
+	   Key info file example:
+
+		   http://server/file.key
+		   /path/to/file.key
+		   0123456789ABCDEF0123456789ABCDEF
+
+	   Example shell script:
+
+		   #!/bin/sh
+		   BASE_URL=${1:-'.'}
+		   openssl rand 16 > file.key
+		   echo $BASE_URL/file.key > file.keyinfo
+		   echo file.key >> file.keyinfo
+		   echo $(openssl rand -hex 16) >> file.keyinfo
+		   ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
+		     -hls_key_info_file file.keyinfo out.m3u8
+
+       -hls_enc enc
+	   Enable (1) or disable (0) the AES128 encryption.  When enabled
+	   every segment generated is encrypted and the encryption key is
+	   saved as playlist name.key.
+
+       -hls_enc_key key
+	   16-octet key to encrypt the segments, by default it is randomly
+	   generated.
+
+       -hls_enc_key_url keyurl
+	   If set, keyurl is prepended instead of baseurl to the key filename
+	   in the playlist.
+
+       -hls_enc_iv iv
+	   16-octet initialization vector for every segment instead of the
+	   autogenerated ones.
+
+       hls_segment_type flags
+	   Possible values:
+
+	   mpegts
+	       Output segment files in MPEG-2 Transport Stream format. This is
+	       compatible with all HLS versions.
+
+	   fmp4
+	       Output segment files in fragmented MP4 format, similar to MPEG-
+	       DASH.  fmp4 files may be used in HLS version 7 and above.
+
+       hls_fmp4_init_filename filename
+	   Set filename to the fragment files header file, default filename is
+	   init.mp4.
+
+	   Use "-strftime 1" on filename to expand the segment filename with
+	   localtime.
+
+		   ffmpeg -i in.nut  -hls_segment_type fmp4 -strftime 1 -hls_fmp4_init_filename "%s_init.mp4" out.m3u8
+
+	   This will produce init like this 1602678741_init.mp4
+
+       hls_fmp4_init_resend
+	   Resend init file after m3u8 file refresh every time, default is 0.
+
+	   When "var_stream_map" is set with two or more variant streams, the
+	   filename pattern must contain the string "%v", this string
+	   specifies the position of variant stream index in the generated
+	   init file names.  The string "%v" may be present in the filename or
+	   in the last directory name containing the file. If the string is
+	   present in the directory name, then sub-directories are created
+	   after expanding the directory name pattern. This enables creation
+	   of init files corresponding to different variant streams in
+	   subdirectories.
+
+       hls_flags flags
+	   Possible values:
+
+	   single_file
+	       If this flag is set, the muxer will store all segments in a
+	       single MPEG-TS file, and will use byte ranges in the playlist.
+	       HLS playlists generated with this way will have the version
+	       number 4.  For example:
+
+		       ffmpeg -i in.nut -hls_flags single_file out.m3u8
+
+	       Will produce the playlist, out.m3u8, and a single segment file,
+	       out.ts.
+
+	   delete_segments
+	       Segment files removed from the playlist are deleted after a
+	       period of time equal to the duration of the segment plus the
+	       duration of the playlist.
+
+	   append_list
+	       Append new segments into the end of old segment list, and
+	       remove the "#EXT-X-ENDLIST" from the old segment list.
+
+	   round_durations
+	       Round the duration info in the playlist file segment info to
+	       integer values, instead of using floating point.  If there are
+	       no other features requiring higher HLS versions be used, then
+	       this will allow ffmpeg to output a HLS version 2 m3u8.
+
+	   discont_start
+	       Add the "#EXT-X-DISCONTINUITY" tag to the playlist, before the
+	       first segment's information.
+
+	   omit_endlist
+	       Do not append the "EXT-X-ENDLIST" tag at the end of the
+	       playlist.
+
+	   periodic_rekey
+	       The file specified by "hls_key_info_file" will be checked
+	       periodically and detect updates to the encryption info. Be sure
+	       to replace this file atomically, including the file containing
+	       the AES encryption key.
+
+	   independent_segments
+	       Add the "#EXT-X-INDEPENDENT-SEGMENTS" to playlists that has
+	       video segments and when all the segments of that playlist are
+	       guaranteed to start with a Key frame.
+
+	   iframes_only
+	       Add the "#EXT-X-I-FRAMES-ONLY" to playlists that has video
+	       segments and can play only I-frames in the "#EXT-X-BYTERANGE"
+	       mode.
+
+	   split_by_time
+	       Allow segments to start on frames other than keyframes. This
+	       improves behavior on some players when the time between
+	       keyframes is inconsistent, but may make things worse on others,
+	       and can cause some oddities during seeking. This flag should be
+	       used with the "hls_time" option.
+
+	   program_date_time
+	       Generate "EXT-X-PROGRAM-DATE-TIME" tags.
+
+	   second_level_segment_index
+	       Makes it possible to use segment indexes as %%d in
+	       hls_segment_filename expression besides date/time values when
+	       strftime is on.	To get fixed width numbers with trailing
+	       zeroes, %%0xd format is available where x is the required
+	       width.
+
+	   second_level_segment_size
+	       Makes it possible to use segment sizes (counted in bytes) as
+	       %%s in hls_segment_filename expression besides date/time values
+	       when strftime is on.  To get fixed width numbers with trailing
+	       zeroes, %%0xs format is available where x is the required
+	       width.
+
+	   second_level_segment_duration
+	       Makes it possible to use segment duration (calculated  in
+	       microseconds) as %%t in hls_segment_filename expression besides
+	       date/time values when strftime is on.  To get fixed width
+	       numbers with trailing zeroes, %%0xt format is available where x
+	       is the required width.
+
+		       ffmpeg -i sample.mpeg \
+			  -f hls -hls_time 3 -hls_list_size 5 \
+			  -hls_flags second_level_segment_index+second_level_segment_size+second_level_segment_duration \
+			  -strftime 1 -strftime_mkdir 1 -hls_segment_filename "segment_%Y%m%d%H%M%S_%%04d_%%08s_%%013t.ts" stream.m3u8
+
+	       This will produce segments like this:
+	       segment_20170102194334_0003_00122200_0000003000000.ts,
+	       segment_20170102194334_0004_00120072_0000003000000.ts etc.
+
+	   temp_file
+	       Write segment data to filename.tmp and rename to filename only
+	       once the segment is complete. A webserver serving up segments
+	       can be configured to reject requests to *.tmp to prevent access
+	       to in-progress segments before they have been added to the m3u8
+	       playlist. This flag also affects how m3u8 playlist files are
+	       created.  If this flag is set, all playlist files will written
+	       into temporary file and renamed after they are complete,
+	       similarly as segments are handled.  But playlists with "file"
+	       protocol and with type ("hls_playlist_type") other than "vod"
+	       are always written into temporary file regardless of this flag.
+	       Master playlist files ("master_pl_name"), if any, with "file"
+	       protocol, are always written into temporary file regardless of
+	       this flag if "master_pl_publish_rate" value is other than zero.
+
+       hls_playlist_type event
+	   Emit "#EXT-X-PLAYLIST-TYPE:EVENT" in the m3u8 header. Forces
+	   hls_list_size to 0; the playlist can only be appended to.
+
+       hls_playlist_type vod
+	   Emit "#EXT-X-PLAYLIST-TYPE:VOD" in the m3u8 header. Forces
+	   hls_list_size to 0; the playlist must not change.
+
+       method
+	   Use the given HTTP method to create the hls files.
+
+		   ffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8
+
+	   This example will upload all the mpegts segment files to the HTTP
+	   server using the HTTP PUT method, and update the m3u8 files every
+	   "refresh" times using the same method.  Note that the HTTP server
+	   must support the given method for uploading files.
+
+       http_user_agent
+	   Override User-Agent field in HTTP header. Applicable only for HTTP
+	   output.
+
+       var_stream_map
+	   Map string which specifies how to group the audio, video and
+	   subtitle streams into different variant streams. The variant stream
+	   groups are separated by space.  Expected string format is like this
+	   "a:0,v:0 a:1,v:1 ....". Here a:, v:, s: are the keys to specify
+	   audio, video and subtitle streams respectively.  Allowed values are
+	   0 to 9 (limited just based on practical usage).
+
+	   When there are two or more variant streams, the output filename
+	   pattern must contain the string "%v", this string specifies the
+	   position of variant stream index in the output media playlist
+	   filenames. The string "%v" may be present in the filename or in the
+	   last directory name containing the file. If the string is present
+	   in the directory name, then sub-directories are created after
+	   expanding the directory name pattern. This enables creation of
+	   variant streams in subdirectories.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two hls variant streams. The first variant
+	   stream will contain video stream of bitrate 1000k and audio stream
+	   of bitrate 64k and the second variant stream will contain video
+	   stream of bitrate 256k and audio stream of bitrate 32k. Here, two
+	   media playlist with file names out_0.m3u8 and out_1.m3u8 will be
+	   created. If you want something meaningful text instead of indexes
+	   in result names, you may specify names for each or some of the
+	   variants as in the following example.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0,name:my_hd v:1,a:1,name:my_sd" \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two hls variant streams as in the previous
+	   one.  But here, the two media playlist with file names
+	   out_my_hd.m3u8 and out_my_sd.m3u8 will be created.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k \
+		     -map 0:v -map 0:a -map 0:v -f hls -var_stream_map "v:0 a:0 v:1" \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates three hls variant streams. The first variant
+	   stream will be a video only stream with video bitrate 1000k, the
+	   second variant stream will be an audio only stream with bitrate 64k
+	   and the third variant stream will be a video only stream with
+	   bitrate 256k. Here, three media playlist with file names
+	   out_0.m3u8, out_1.m3u8 and out_2.m3u8 will be created.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     http://example.com/live/vs_%v/out.m3u8
+
+	   This example creates the variant streams in subdirectories. Here,
+	   the first media playlist is created at
+	   http://example.com/live/vs_0/out.m3u8 and the second one at
+	   http://example.com/live/vs_1/out.m3u8.
+
+		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k -b:v:1 3000k	\
+		     -map 0:a -map 0:a -map 0:v -map 0:v -f hls \
+		     -var_stream_map "a:0,agroup:aud_low a:1,agroup:aud_high v:0,agroup:aud_low v:1,agroup:aud_high" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two audio only and two video only variant
+	   streams. In addition to the #EXT-X-STREAM-INF tag for each variant
+	   stream in the master playlist, #EXT-X-MEDIA tag is also added for
+	   the two audio only variant streams and they are mapped to the two
+	   video only variant streams with audio group names 'aud_low' and
+	   'aud_high'.
+
+	   By default, a single hls variant containing all the encoded streams
+	   is created.
+
+		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
+		     -map 0:a -map 0:a -map 0:v -f hls \
+		     -var_stream_map "a:0,agroup:aud_low,default:yes a:1,agroup:aud_low v:0,agroup:aud_low" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two audio only and one video only variant
+	   streams. In addition to the #EXT-X-STREAM-INF tag for each variant
+	   stream in the master playlist, #EXT-X-MEDIA tag is also added for
+	   the two audio only variant streams and they are mapped to the one
+	   video only variant streams with audio group name 'aud_low', and the
+	   audio group have default stat is NO or YES.
+
+	   By default, a single hls variant containing all the encoded streams
+	   is created.
+
+		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
+		     -map 0:a -map 0:a -map 0:v -f hls \
+		     -var_stream_map "a:0,agroup:aud_low,default:yes,language:ENG a:1,agroup:aud_low,language:CHN v:0,agroup:aud_low" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two audio only and one video only variant
+	   streams. In addition to the #EXT-X-STREAM-INF tag for each variant
+	   stream in the master playlist, #EXT-X-MEDIA tag is also added for
+	   the two audio only variant streams and they are mapped to the one
+	   video only variant streams with audio group name 'aud_low', and the
+	   audio group have default stat is NO or YES, and one audio have and
+	   language is named ENG, the other audio language is named CHN.
+
+	   By default, a single hls variant containing all the encoded streams
+	   is created.
+
+		   ffmpeg -y -i input_with_subtitle.mkv \
+		    -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
+		    -b:a:0 256k \
+		    -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
+		    -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
+		    -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
+		    10 -master_pl_publish_rate 10  -hls_flags \
+		    delete_segments+discont_start+split_by_time ./tmp/video.m3u8
+
+	   This example adds "#EXT-X-MEDIA" tag with "TYPE=SUBTITLES" in the
+	   master playlist with webvtt subtitle group name 'subtitle'. Please
+	   make sure the input file has one text subtitle stream at least.
+
+       cc_stream_map
+	   Map string which specifies different closed captions groups and
+	   their attributes. The closed captions stream groups are separated
+	   by space.  Expected string format is like this "ccgroup:<group
+	   name>,instreamid:<INSTREAM-ID>,language:<language code> ....".
+	   'ccgroup' and 'instreamid' are mandatory attributes. 'language' is
+	   an optional attribute.  The closed captions groups configured using
+	   this option are mapped to different variant streams by providing
+	   the same 'ccgroup' name in the "var_stream_map" string. If
+	   "var_stream_map" is not set, then the first available ccgroup in
+	   "cc_stream_map" is mapped to the output variant stream. The
+	   examples for these two use cases are given below.
+
+		   ffmpeg -re -i in.ts -b:v 1000k -b:a 64k -a53cc 1 -f hls \
+		     -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out.m3u8
+
+	   This example adds "#EXT-X-MEDIA" tag with "TYPE=CLOSED-CAPTIONS" in
+	   the master playlist with group name 'cc', language 'en' (english)
+	   and INSTREAM-ID 'CC1'. Also, it adds "CLOSED-CAPTIONS" attribute
+	   with group name 'cc' for the output variant stream.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -a53cc:0 1 -a53cc:1 1\
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls \
+		     -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en ccgroup:cc,instreamid:CC2,language:sp" \
+		     -var_stream_map "v:0,a:0,ccgroup:cc v:1,a:1,ccgroup:cc" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example adds two "#EXT-X-MEDIA" tags with
+	   "TYPE=CLOSED-CAPTIONS" in the master playlist for the INSTREAM-IDs
+	   'CC1' and 'CC2'. Also, it adds "CLOSED-CAPTIONS" attribute with
+	   group name 'cc' for the two output variant streams.
+
+       master_pl_name
+	   Create HLS master playlist with the given name.
+
+		   ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 http://example.com/live/out.m3u8
+
+	   This example creates HLS master playlist with name master.m3u8 and
+	   it is published at http://example.com/live/
+
+       master_pl_publish_rate
+	   Publish master play list repeatedly every after specified number of
+	   segment intervals.
+
+		   ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 \
+		   -hls_time 2 -master_pl_publish_rate 30 http://example.com/live/out.m3u8
+
+	   This example creates HLS master playlist with name master.m3u8 and
+	   keep publishing it repeatedly every after 30 segments i.e. every
+	   after 60s.
+
+       http_persistent
+	   Use persistent HTTP connections. Applicable only for HTTP output.
+
+       timeout
+	   Set timeout for socket I/O operations. Applicable only for HTTP
+	   output.
+
+       ignore_io_errors
+	   Ignore IO errors during open, write and delete. Useful for long-
+	   duration runs with network output.
+
+       headers
+	   Set custom HTTP headers, can override built in default headers.
+	   Applicable only for HTTP output.
+
+   ico
+       ICO file muxer.
+
+       Microsoft's icon file format (ICO) has some strict limitations that
+       should be noted:
+
+       o   Size cannot exceed 256 pixels in any dimension
+
+       o   Only BMP and PNG images can be stored
+
+       o   If a BMP image is used, it must be one of the following pixel
+	   formats:
+
+		   BMP Bit Depth      FFmpeg Pixel Format
+		   1bit 	      pal8
+		   4bit 	      pal8
+		   8bit 	      pal8
+		   16bit	      rgb555le
+		   24bit	      bgr24
+		   32bit	      bgra
+
+       o   If a BMP image is used, it must use the BITMAPINFOHEADER DIB header
+
+       o   If a PNG image is used, it must use the rgba pixel format
+
+   image2
+       Image file muxer.
+
+       The image file muxer writes video frames to image files.
+
+       The output filenames are specified by a pattern, which can be used to
+       produce sequentially numbered series of files.  The pattern may contain
+       the string "%d" or "%0Nd", this string specifies the position of the
+       characters representing a numbering in the filenames. If the form
+       "%0Nd" is used, the string representing the number in each filename is
+       0-padded to N digits. The literal character '%' can be specified in the
+       pattern with the string "%%".
+
+       If the pattern contains "%d" or "%0Nd", the first filename of the file
+       list specified will contain the number 1, all the following numbers
+       will be sequential.
+
+       The pattern may contain a suffix which is used to automatically
+       determine the format of the image files to write.
+
+       For example the pattern "img-%03d.bmp" will specify a sequence of
+       filenames of the form img-001.bmp, img-002.bmp, ..., img-010.bmp, etc.
+       The pattern "img%%-%d.jpg" will specify a sequence of filenames of the
+       form img%-1.jpg, img%-2.jpg, ..., img%-10.jpg, etc.
+
+       The image muxer supports the .Y.U.V image file format. This format is
+       special in that each image frame consists of three files, for each of
+       the YUV420P components. To read or write this image file format,
+       specify the name of the '.Y' file. The muxer will automatically open
+       the '.U' and '.V' files as required.
+
+       Options
+
+       frame_pts
+	   If set to 1, expand the filename with pts from pkt->pts.  Default
+	   value is 0.
+
+       start_number
+	   Start the sequence from the specified number. Default value is 1.
+
+       update
+	   If set to 1, the filename will always be interpreted as just a
+	   filename, not a pattern, and the corresponding file will be
+	   continuously overwritten with new images. Default value is 0.
+
+       strftime
+	   If set to 1, expand the filename with date and time information
+	   from "strftime()". Default value is 0.
+
+       atomic_writing
+	   Write output to a temporary file, which is renamed to target
+	   filename once writing is completed. Default is disabled.
+
+       protocol_opts options_list
+	   Set protocol options as a :-separated list of key=value parameters.
+	   Values containing the ":" special character must be escaped.
+
+       Examples
+
+       The following example shows how to use ffmpeg for creating a sequence
+       of files img-001.jpeg, img-002.jpeg, ..., taking one image every second
+       from the input video:
+
+	       ffmpeg -i in.avi -vsync cfr -r 1 -f image2 'img-%03d.jpeg'
+
+       Note that with ffmpeg, if the format is not specified with the "-f"
+       option and the output filename specifies an image file format, the
+       image2 muxer is automatically selected, so the previous command can be
+       written as:
+
+	       ffmpeg -i in.avi -vsync cfr -r 1 'img-%03d.jpeg'
+
+       Note also that the pattern must not necessarily contain "%d" or "%0Nd",
+       for example to create a single image file img.jpeg from the start of
+       the input video you can employ the command:
+
+	       ffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg
+
+       The strftime option allows you to expand the filename with date and
+       time information. Check the documentation of the "strftime()" function
+       for the syntax.
+
+       For example to generate image files from the "strftime()"
+       "%Y-%m-%d_%H-%M-%S" pattern, the following ffmpeg command can be used:
+
+	       ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 "%Y-%m-%d_%H-%M-%S.jpg"
+
+       You can set the file name with current frame's PTS:
+
+	       ffmpeg -f v4l2 -r 1 -i /dev/video0 -copyts -f image2 -frame_pts true %d.jpg
+
+       A more complex example is to publish contents of your desktop directly
+       to a WebDAV server every second:
+
+	       ffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocol_opts method=PUT http://example.com/desktop.jpg
+
+   matroska
+       Matroska container muxer.
+
+       This muxer implements the matroska and webm container specs.
+
+       Metadata
+
+       The recognized metadata settings in this muxer are:
+
+       title
+	   Set title name provided to a single track. This gets mapped to the
+	   FileDescription element for a stream written as attachment.
+
+       language
+	   Specify the language of the track in the Matroska languages form.
+
+	   The language can be either the 3 letters bibliographic ISO-639-2
+	   (ISO 639-2/B) form (like "fre" for French), or a language code
+	   mixed with a country code for specialities in languages (like "fre-
+	   ca" for Canadian French).
+
+       stereo_mode
+	   Set stereo 3D video layout of two views in a single video track.
+
+	   The following values are recognized:
+
+	   mono
+	       video is not stereo
+
+	   left_right
+	       Both views are arranged side by side, Left-eye view is on the
+	       left
+
+	   bottom_top
+	       Both views are arranged in top-bottom orientation, Left-eye
+	       view is at bottom
+
+	   top_bottom
+	       Both views are arranged in top-bottom orientation, Left-eye
+	       view is on top
+
+	   checkerboard_rl
+	       Each view is arranged in a checkerboard interleaved pattern,
+	       Left-eye view being first
+
+	   checkerboard_lr
+	       Each view is arranged in a checkerboard interleaved pattern,
+	       Right-eye view being first
+
+	   row_interleaved_rl
+	       Each view is constituted by a row based interleaving, Right-eye
+	       view is first row
+
+	   row_interleaved_lr
+	       Each view is constituted by a row based interleaving, Left-eye
+	       view is first row
+
+	   col_interleaved_rl
+	       Both views are arranged in a column based interleaving manner,
+	       Right-eye view is first column
+
+	   col_interleaved_lr
+	       Both views are arranged in a column based interleaving manner,
+	       Left-eye view is first column
+
+	   anaglyph_cyan_red
+	       All frames are in anaglyph format viewable through red-cyan
+	       filters
+
+	   right_left
+	       Both views are arranged side by side, Right-eye view is on the
+	       left
+
+	   anaglyph_green_magenta
+	       All frames are in anaglyph format viewable through green-
+	       magenta filters
+
+	   block_lr
+	       Both eyes laced in one Block, Left-eye view is first
+
+	   block_rl
+	       Both eyes laced in one Block, Right-eye view is first
+
+       For example a 3D WebM clip can be created using the following command
+       line:
+
+	       ffmpeg -i sample_left_right_clip.mpg -an -c:v libvpx -metadata stereo_mode=left_right -y stereo_clip.webm
+
+       Options
+
+       This muxer supports the following options:
+
+       reserve_index_space
+	   By default, this muxer writes the index for seeking (called cues in
+	   Matroska terms) at the end of the file, because it cannot know in
+	   advance how much space to leave for the index at the beginning of
+	   the file. However for some use cases -- e.g.  streaming where
+	   seeking is possible but slow -- it is useful to put the index at
+	   the beginning of the file.
+
+	   If this option is set to a non-zero value, the muxer will reserve a
+	   given amount of space in the file header and then try to write the
+	   cues there when the muxing finishes. If the reserved space does not
+	   suffice, no Cues will be written, the file will be finalized and
+	   writing the trailer will return an error.  A safe size for most use
+	   cases should be about 50kB per hour of video.
+
+	   Note that cues are only written if the output is seekable and this
+	   option will have no effect if it is not.
+
+       cues_to_front
+	   If set, the muxer will write the index at the beginning of the file
+	   by shifting the main data if necessary. This can be combined with
+	   reserve_index_space in which case the data is only shifted if the
+	   initially reserved space turns out to be insufficient.
+
+	   This option is ignored if the output is unseekable.
+
+       default_mode
+	   This option controls how the FlagDefault of the output tracks will
+	   be set.  It influences which tracks players should play by default.
+	   The default mode is passthrough.
+
+	   infer
+	       Every track with disposition default will have the FlagDefault
+	       set.  Additionally, for each type of track (audio, video or
+	       subtitle), if no track with disposition default of this type
+	       exists, then the first track of this type will be marked as
+	       default (if existing). This ensures that the default flag is
+	       set in a sensible way even if the input originated from
+	       containers that lack the concept of default tracks.
+
+	   infer_no_subs
+	       This mode is the same as infer except that if no subtitle track
+	       with disposition default exists, no subtitle track will be
+	       marked as default.
+
+	   passthrough
+	       In this mode the FlagDefault is set if and only if the
+	       AV_DISPOSITION_DEFAULT flag is set in the disposition of the
+	       corresponding stream.
+
+       flipped_raw_rgb
+	   If set to true, store positive height for raw RGB bitmaps, which
+	   indicates bitmap is stored bottom-up. Note that this option does
+	   not flip the bitmap which has to be done manually beforehand, e.g.
+	   by using the vflip filter.  Default is false and indicates bitmap
+	   is stored top down.
+
+   md5
+       MD5 testing format.
+
+       This is a variant of the hash muxer. Unlike that muxer, it defaults to
+       using the MD5 hash function.
+
+       Examples
+
+       To compute the MD5 hash of the input converted to raw audio and video,
+       and store it in the file out.md5:
+
+	       ffmpeg -i INPUT -f md5 out.md5
+
+       You can print the MD5 to stdout with the command:
+
+	       ffmpeg -i INPUT -f md5 -
+
+       See also the hash and framemd5 muxers.
+
+   mp3
+       The MP3 muxer writes a raw MP3 stream with the following optional
+       features:
+
+       o   An ID3v2 metadata header at the beginning (enabled by default).
+	   Versions 2.3 and 2.4 are supported, the "id3v2_version" private
+	   option controls which one is used (3 or 4). Setting "id3v2_version"
+	   to 0 disables the ID3v2 header completely.
+
+	   The muxer supports writing attached pictures (APIC frames) to the
+	   ID3v2 header.  The pictures are supplied to the muxer in form of a
+	   video stream with a single packet. There can be any number of those
+	   streams, each will correspond to a single APIC frame.  The stream
+	   metadata tags title and comment map to APIC description and picture
+	   type respectively. See <http://id3.org/id3v2.4.0-frames> for
+	   allowed picture types.
+
+	   Note that the APIC frames must be written at the beginning, so the
+	   muxer will buffer the audio frames until it gets all the pictures.
+	   It is therefore advised to provide the pictures as soon as possible
+	   to avoid excessive buffering.
+
+       o   A Xing/LAME frame right after the ID3v2 header (if present). It is
+	   enabled by default, but will be written only if the output is
+	   seekable. The "write_xing" private option can be used to disable
+	   it.	The frame contains various information that may be useful to
+	   the decoder, like the audio duration or encoder delay.
+
+       o   A legacy ID3v1 tag at the end of the file (disabled by default). It
+	   may be enabled with the "write_id3v1" private option, but as its
+	   capabilities are very limited, its usage is not recommended.
+
+       Examples:
+
+       Write an mp3 with an ID3v2.3 header and an ID3v1 footer:
+
+	       ffmpeg -i INPUT -id3v2_version 3 -write_id3v1 1 out.mp3
+
+       To attach a picture to an mp3 file select both the audio and the
+       picture stream with "map":
+
+	       ffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1
+	       -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3
+
+       Write a "clean" MP3 without any extra features:
+
+	       ffmpeg -i input.wav -write_xing 0 -id3v2_version 0 out.mp3
+
+   mpegts
+       MPEG transport stream muxer.
+
+       This muxer implements ISO 13818-1 and part of ETSI EN 300 468.
+
+       The recognized metadata settings in mpegts muxer are "service_provider"
+       and "service_name". If they are not set the default for
+       "service_provider" is FFmpeg and the default for "service_name" is
+       Service01.
+
+       Options
+
+       The muxer options are:
+
+       mpegts_transport_stream_id integer
+	   Set the transport_stream_id. This identifies a transponder in DVB.
+	   Default is 0x0001.
+
+       mpegts_original_network_id integer
+	   Set the original_network_id. This is unique identifier of a network
+	   in DVB. Its main use is in the unique identification of a service
+	   through the path Original_Network_ID, Transport_Stream_ID. Default
+	   is 0x0001.
+
+       mpegts_service_id integer
+	   Set the service_id, also known as program in DVB. Default is
+	   0x0001.
+
+       mpegts_service_type integer
+	   Set the program service_type. Default is "digital_tv".  Accepts the
+	   following options:
+
+	   hex_value
+	       Any hexadecimal value between 0x01 and 0xff as defined in ETSI
+	       300 468.
+
+	   digital_tv
+	       Digital TV service.
+
+	   digital_radio
+	       Digital Radio service.
+
+	   teletext
+	       Teletext service.
+
+	   advanced_codec_digital_radio
+	       Advanced Codec Digital Radio service.
+
+	   mpeg2_digital_hdtv
+	       MPEG2 Digital HDTV service.
+
+	   advanced_codec_digital_sdtv
+	       Advanced Codec Digital SDTV service.
+
+	   advanced_codec_digital_hdtv
+	       Advanced Codec Digital HDTV service.
+
+       mpegts_pmt_start_pid integer
+	   Set the first PID for PMTs. Default is 0x1000, minimum is 0x0020,
+	   maximum is 0x1ffa. This option has no effect in m2ts mode where the
+	   PMT PID is fixed 0x0100.
+
+       mpegts_start_pid integer
+	   Set the first PID for elementary streams. Default is 0x0100,
+	   minimum is 0x0020, maximum is 0x1ffa. This option has no effect in
+	   m2ts mode where the elementary stream PIDs are fixed.
+
+       mpegts_m2ts_mode boolean
+	   Enable m2ts mode if set to 1. Default value is "-1" which disables
+	   m2ts mode.
+
+       muxrate integer
+	   Set a constant muxrate. Default is VBR.
+
+       pes_payload_size integer
+	   Set minimum PES packet payload in bytes. Default is 2930.
+
+       mpegts_flags flags
+	   Set mpegts flags. Accepts the following options:
+
+	   resend_headers
+	       Reemit PAT/PMT before writing the next packet.
+
+	   latm
+	       Use LATM packetization for AAC.
+
+	   pat_pmt_at_frames
+	       Reemit PAT and PMT at each video frame.
+
+	   system_b
+	       Conform to System B (DVB) instead of System A (ATSC).
+
+	   initial_discontinuity
+	       Mark the initial packet of each stream as discontinuity.
+
+	   nit Emit NIT table.
+
+	   omit_rai
+	       Disable writing of random access indicator.
+
+       mpegts_copyts boolean
+	   Preserve original timestamps, if value is set to 1. Default value
+	   is "-1", which results in shifting timestamps so that they start
+	   from 0.
+
+       omit_video_pes_length boolean
+	   Omit the PES packet length for video packets. Default is 1 (true).
+
+       pcr_period integer
+	   Override the default PCR retransmission time in milliseconds.
+	   Default is "-1" which means that the PCR interval will be
+	   determined automatically: 20 ms is used for CBR streams, the
+	   highest multiple of the frame duration which is less than 100 ms is
+	   used for VBR streams.
+
+       pat_period duration
+	   Maximum time in seconds between PAT/PMT tables. Default is 0.1.
+
+       sdt_period duration
+	   Maximum time in seconds between SDT tables. Default is 0.5.
+
+       nit_period duration
+	   Maximum time in seconds between NIT tables. Default is 0.5.
+
+       tables_version integer
+	   Set PAT, PMT, SDT and NIT version (default 0, valid values are from
+	   0 to 31, inclusively).  This option allows updating stream
+	   structure so that standard consumer may detect the change. To do
+	   so, reopen output "AVFormatContext" (in case of API usage) or
+	   restart ffmpeg instance, cyclically changing tables_version value:
+
+		   ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
+		   ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
+		   ...
+		   ffmpeg -i source3.ts -codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
+		   ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
+		   ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
+		   ...
+
+       Example
+
+	       ffmpeg -i file.mpg -c copy \
+		    -mpegts_original_network_id 0x1122 \
+		    -mpegts_transport_stream_id 0x3344 \
+		    -mpegts_service_id 0x5566 \
+		    -mpegts_pmt_start_pid 0x1500 \
+		    -mpegts_start_pid 0x150 \
+		    -metadata service_provider="Some provider" \
+		    -metadata service_name="Some Channel" \
+		    out.ts
+
+   mxf, mxf_d10, mxf_opatom
+       MXF muxer.
+
+       Options
+
+       The muxer options are:
+
+       store_user_comments bool
+	   Set if user comments should be stored if available or never.  IRT
+	   D-10 does not allow user comments. The default is thus to write
+	   them for mxf and mxf_opatom but not for mxf_d10
+
+   null
+       Null muxer.
+
+       This muxer does not generate any output file, it is mainly useful for
+       testing or benchmarking purposes.
+
+       For example to benchmark decoding with ffmpeg you can use the command:
+
+	       ffmpeg -benchmark -i INPUT -f null out.null
+
+       Note that the above command does not read or write the out.null file,
+       but specifying the output file is required by the ffmpeg syntax.
+
+       Alternatively you can write the command as:
+
+	       ffmpeg -benchmark -i INPUT -f null -
+
+   nut
+       -syncpoints flags
+	   Change the syncpoint usage in nut:
+
+	   default use the normal low-overhead seeking aids.
+	   none do not use the syncpoints at all, reducing the overhead but
+	   making the stream non-seekable;
+		   Use of this option is not recommended, as the resulting files are very damage
+		   sensitive and seeking is not possible. Also in general the overhead from
+		   syncpoints is negligible. Note, -C<write_index> 0 can be used to disable
+		   all growing data tables, allowing to mux endless streams with limited memory
+		   and without these disadvantages.
+
+	   timestamped extend the syncpoint with a wallclock field.
+
+	   The none and timestamped flags are experimental.
+
+       -write_index bool
+	   Write index at the end, the default is to write an index.
+
+	       ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor
+
+   ogg
+       Ogg container muxer.
+
+       -page_duration duration
+	   Preferred page duration, in microseconds. The muxer will attempt to
+	   create pages that are approximately duration microseconds long.
+	   This allows the user to compromise between seek granularity and
+	   container overhead. The default is 1 second. A value of 0 will fill
+	   all segments, making pages as large as possible. A value of 1 will
+	   effectively use 1 packet-per-page in most situations, giving a
+	   small seek granularity at the cost of additional container
+	   overhead.
+
+       -serial_offset value
+	   Serial value from which to set the streams serial number.  Setting
+	   it to different and sufficiently large values ensures that the
+	   produced ogg files can be safely chained.
+
+   rcwt
+       Raw Captions With Time (RCWT) is a format native to ccextractor, a
+       commonly used open source tool for processing 608/708 closed caption
+       (CC) sources.  It can be used to archive the original, raw CC bitstream
+       and to produce a source file for later CC processing or conversion. As
+       a result, it also allows for interopability with ccextractor for
+       processing CC data extracted via ffmpeg. The format is simple to parse
+       and can be used to retain all lines and variants of CC.
+
+       This muxer implements the specification as of 2024-01-05, which has
+       been stable and unchanged for 10 years as of this writing.
+
+       This muxer will have some nuances from the way that ccextractor muxes
+       RCWT.  No compatibility issues when processing the output with
+       ccextractor have been observed as a result of this so far, but mileage
+       may vary and outputs will not be a bit-exact match.
+
+       A free specification of RCWT can be found here:
+       <https://github.com/CCExtractor/ccextractor/blob/master/docs/BINARY_FILE_FORMAT.TXT>
+
+   segment, stream_segment, ssegment
+       Basic stream segmenter.
+
+       This muxer outputs streams to a number of separate files of nearly
+       fixed duration. Output filename pattern can be set in a fashion similar
+       to image2, or by using a "strftime" template if the strftime option is
+       enabled.
+
+       "stream_segment" is a variant of the muxer used to write to streaming
+       output formats, i.e. which do not require global headers, and is
+       recommended for outputting e.g. to MPEG transport stream segments.
+       "ssegment" is a shorter alias for "stream_segment".
+
+       Every segment starts with a keyframe of the selected reference stream,
+       which is set through the reference_stream option.
+
+       Note that if you want accurate splitting for a video file, you need to
+       make the input key frames correspond to the exact splitting times
+       expected by the segmenter, or the segment muxer will start the new
+       segment with the key frame found next after the specified start time.
+
+       The segment muxer works best with a single constant frame rate video.
+
+       Optionally it can generate a list of the created segments, by setting
+       the option segment_list. The list type is specified by the
+       segment_list_type option. The entry filenames in the segment list are
+       set by default to the basename of the corresponding segment files.
+
+       See also the hls muxer, which provides a more specific implementation
+       for HLS segmentation.
+
+       Options
+
+       The segment muxer supports the following options:
+
+       increment_tc 1|0
+	   if set to 1, increment timecode between each segment If this is
+	   selected, the input need to have a timecode in the first video
+	   stream. Default value is 0.
+
+       reference_stream specifier
+	   Set the reference stream, as specified by the string specifier.  If
+	   specifier is set to "auto", the reference is chosen automatically.
+	   Otherwise it must be a stream specifier (see the ``Stream
+	   specifiers'' chapter in the ffmpeg manual) which specifies the
+	   reference stream. The default value is "auto".
+
+       segment_format format
+	   Override the inner container format, by default it is guessed by
+	   the filename extension.
+
+       segment_format_options options_list
+	   Set output format options using a :-separated list of key=value
+	   parameters. Values containing the ":" special character must be
+	   escaped.
+
+       segment_list name
+	   Generate also a listfile named name. If not specified no listfile
+	   is generated.
+
+       segment_list_flags flags
+	   Set flags affecting the segment list generation.
+
+	   It currently supports the following flags:
+
+	   cache
+	       Allow caching (only affects M3U8 list files).
+
+	   live
+	       Allow live-friendly file generation.
+
+       segment_list_size size
+	   Update the list file so that it contains at most size segments. If
+	   0 the list file will contain all the segments. Default value is 0.
+
+       segment_list_entry_prefix prefix
+	   Prepend prefix to each entry. Useful to generate absolute paths.
+	   By default no prefix is applied.
+
+       segment_list_type type
+	   Select the listing format.
+
+	   The following values are recognized:
+
+	   flat
+	       Generate a flat list for the created segments, one segment per
+	       line.
+
+	   csv, ext
+	       Generate a list for the created segments, one segment per line,
+	       each line matching the format (comma-separated values):
+
+		       <segment_filename>,<segment_start_time>,<segment_end_time>
+
+	       segment_filename is the name of the output file generated by
+	       the muxer according to the provided pattern. CSV escaping
+	       (according to RFC4180) is applied if required.
+
+	       segment_start_time and segment_end_time specify the segment
+	       start and end time expressed in seconds.
+
+	       A list file with the suffix ".csv" or ".ext" will auto-select
+	       this format.
+
+	       ext is deprecated in favor or csv.
+
+	   ffconcat
+	       Generate an ffconcat file for the created segments. The
+	       resulting file can be read using the FFmpeg concat demuxer.
+
+	       A list file with the suffix ".ffcat" or ".ffconcat" will auto-
+	       select this format.
+
+	   m3u8
+	       Generate an extended M3U8 file, version 3, compliant with
+	       <http://tools.ietf.org/id/draft-pantos-http-live-streaming>.
+
+	       A list file with the suffix ".m3u8" will auto-select this
+	       format.
+
+	   If not specified the type is guessed from the list file name
+	   suffix.
+
+       segment_time time
+	   Set segment duration to time, the value must be a duration
+	   specification. Default value is "2". See also the segment_times
+	   option.
+
+	   Note that splitting may not be accurate, unless you force the
+	   reference stream key-frames at the given time. See the introductory
+	   notice and the examples below.
+
+       min_seg_duration time
+	   Set minimum segment duration to time, the value must be a duration
+	   specification. This prevents the muxer ending segments at a
+	   duration below this value. Only effective with "segment_time".
+	   Default value is "0".
+
+       segment_atclocktime 1|0
+	   If set to "1" split at regular clock time intervals starting from
+	   00:00 o'clock. The time value specified in segment_time is used for
+	   setting the length of the splitting interval.
+
+	   For example with segment_time set to "900" this makes it possible
+	   to create files at 12:00 o'clock, 12:15, 12:30, etc.
+
+	   Default value is "0".
+
+       segment_clocktime_offset duration
+	   Delay the segment splitting times with the specified duration when
+	   using segment_atclocktime.
+
+	   For example with segment_time set to "900" and
+	   segment_clocktime_offset set to "300" this makes it possible to
+	   create files at 12:05, 12:20, 12:35, etc.
+
+	   Default value is "0".
+
+       segment_clocktime_wrap_duration duration
+	   Force the segmenter to only start a new segment if a packet reaches
+	   the muxer within the specified duration after the segmenting clock
+	   time. This way you can make the segmenter more resilient to
+	   backward local time jumps, such as leap seconds or transition to
+	   standard time from daylight savings time.
+
+	   Default is the maximum possible duration which means starting a new
+	   segment regardless of the elapsed time since the last clock time.
+
+       segment_time_delta delta
+	   Specify the accuracy time when selecting the start time for a
+	   segment, expressed as a duration specification. Default value is
+	   "0".
+
+	   When delta is specified a key-frame will start a new segment if its
+	   PTS satisfies the relation:
+
+		   PTS >= start_time - time_delta
+
+	   This option is useful when splitting video content, which is always
+	   split at GOP boundaries, in case a key frame is found just before
+	   the specified split time.
+
+	   In particular may be used in combination with the ffmpeg option
+	   force_key_frames. The key frame times specified by force_key_frames
+	   may not be set accurately because of rounding issues, with the
+	   consequence that a key frame time may result set just before the
+	   specified time. For constant frame rate videos a value of
+	   1/(2*frame_rate) should address the worst case mismatch between the
+	   specified time and the time set by force_key_frames.
+
+       segment_times times
+	   Specify a list of split points. times contains a list of comma
+	   separated duration specifications, in increasing order. See also
+	   the segment_time option.
+
+       segment_frames frames
+	   Specify a list of split video frame numbers. frames contains a list
+	   of comma separated integer numbers, in increasing order.
+
+	   This option specifies to start a new segment whenever a reference
+	   stream key frame is found and the sequential number (starting from
+	   0) of the frame is greater or equal to the next value in the list.
+
+       segment_wrap limit
+	   Wrap around segment index once it reaches limit.
+
+       segment_start_number number
+	   Set the sequence number of the first segment. Defaults to 0.
+
+       strftime 1|0
+	   Use the "strftime" function to define the name of the new segments
+	   to write. If this is selected, the output segment name must contain
+	   a "strftime" function template. Default value is 0.
+
+       break_non_keyframes 1|0
+	   If enabled, allow segments to start on frames other than keyframes.
+	   This improves behavior on some players when the time between
+	   keyframes is inconsistent, but may make things worse on others, and
+	   can cause some oddities during seeking. Defaults to 0.
+
+       reset_timestamps 1|0
+	   Reset timestamps at the beginning of each segment, so that each
+	   segment will start with near-zero timestamps. It is meant to ease
+	   the playback of the generated segments. May not work with some
+	   combinations of muxers/codecs. It is set to 0 by default.
+
+       initial_offset offset
+	   Specify timestamp offset to apply to the output packet timestamps.
+	   The argument must be a time duration specification, and defaults to
+	   0.
+
+       write_empty_segments 1|0
+	   If enabled, write an empty segment if there are no packets during
+	   the period a segment would usually span. Otherwise, the segment
+	   will be filled with the next packet written. Defaults to 0.
+
+       Make sure to require a closed GOP when encoding and to set the GOP size
+       to fit your segment time constraint.
+
+       Examples
+
+       o   Remux the content of file in.mkv to a list of segments out-000.nut,
+	   out-001.nut, etc., and write the list of generated segments to
+	   out.list:
+
+		   ffmpeg -i in.mkv -codec hevc -flags +cgop -g 60 -map 0 -f segment -segment_list out.list out%03d.nut
+
+       o   Segment input and set output format options for the output
+	   segments:
+
+		   ffmpeg -i in.mkv -f segment -segment_time 10 -segment_format_options movflags=+faststart out%03d.mp4
+
+       o   Segment the input file according to the split points specified by
+	   the segment_times option:
+
+		   ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 out%03d.nut
+
+       o   Use the ffmpeg force_key_frames option to force key frames in the
+	   input at the specified location, together with the segment option
+	   segment_time_delta to account for possible roundings operated when
+	   setting key frame times.
+
+		   ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le -map 0 \
+		   -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut
+
+	   In order to force key frames on the input file, transcoding is
+	   required.
+
+       o   Segment the input file by splitting the input file according to the
+	   frame numbers sequence specified with the segment_frames option:
+
+		   ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_frames 100,200,300,500,800 out%03d.nut
+
+       o   Convert the in.mkv to TS segments using the "libx264" and "aac"
+	   encoders:
+
+		   ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segment_list out.list out%03d.ts
+
+       o   Segment the input file, and create an M3U8 live playlist (can be
+	   used as live HLS source):
+
+		   ffmpeg -re -i in.mkv -codec copy -map 0 -f segment -segment_list playlist.m3u8 \
+		   -segment_list_flags +live -segment_time 10 out%03d.mkv
+
+   smoothstreaming
+       Smooth Streaming muxer generates a set of files (Manifest, chunks)
+       suitable for serving with conventional web server.
+
+       window_size
+	   Specify the number of fragments kept in the manifest. Default 0
+	   (keep all).
+
+       extra_window_size
+	   Specify the number of fragments kept outside of the manifest before
+	   removing from disk. Default 5.
+
+       lookahead_count
+	   Specify the number of lookahead fragments. Default 2.
+
+       min_frag_duration
+	   Specify the minimum fragment duration (in microseconds). Default
+	   5000000.
+
+       remove_at_exit
+	   Specify whether to remove all fragments when finished. Default 0
+	   (do not remove).
+
+   streamhash
+       Per stream hash testing format.
+
+       This muxer computes and prints a cryptographic hash of all the input
+       frames, on a per-stream basis. This can be used for equality checks
+       without having to do a complete binary comparison.
+
+       By default audio frames are converted to signed 16-bit raw audio and
+       video frames to raw video before computing the hash, but the output of
+       explicit conversions to other codecs can also be used. Timestamps are
+       ignored. It uses the SHA-256 cryptographic hash function by default,
+       but supports several other algorithms.
+
+       The output of the muxer consists of one line per stream of the form:
+       streamindex,streamtype,algo=hash, where streamindex is the index of the
+       mapped stream, streamtype is a single character indicating the type of
+       stream, algo is a short string representing the hash function used, and
+       hash is a hexadecimal number representing the computed hash.
+
+       hash algorithm
+	   Use the cryptographic hash function specified by the string
+	   algorithm.  Supported values include "MD5", "murmur3", "RIPEMD128",
+	   "RIPEMD160", "RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
+	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
+	   and "adler32".
+
+       Examples
+
+       To compute the SHA-256 hash of the input converted to raw audio and
+       video, and store it in the file out.sha256:
+
+	       ffmpeg -i INPUT -f streamhash out.sha256
+
+       To print an MD5 hash to stdout use the command:
+
+	       ffmpeg -i INPUT -f streamhash -hash md5 -
+
+       See also the hash and framehash muxers.
+
+   tee
+       The tee muxer can be used to write the same data to several outputs,
+       such as files or streams.  It can be used, for example, to stream a
+       video over a network and save it to disk at the same time.
+
+       It is different from specifying several outputs to the ffmpeg command-
+       line tool. With the tee muxer, the audio and video data will be encoded
+       only once.  With conventional multiple outputs, multiple encoding
+       operations in parallel are initiated, which can be a very expensive
+       process. The tee muxer is not useful when using the libavformat API
+       directly because it is then possible to feed the same packets to
+       several muxers directly.
+
+       Since the tee muxer does not represent any particular output format,
+       ffmpeg cannot auto-select output streams. So all streams intended for
+       output must be specified using "-map". See the examples below.
+
+       Some encoders may need different options depending on the output
+       format; the auto-detection of this can not work with the tee muxer, so
+       they need to be explicitly specified.  The main example is the
+       global_header flag.
+
+       The slave outputs are specified in the file name given to the muxer,
+       separated by '|'. If any of the slave name contains the '|' separator,
+       leading or trailing spaces or any special character, those must be
+       escaped (see the "Quoting and escaping" section in the ffmpeg-utils(1)
+       manual).
+
+       Options
+
+       use_fifo bool
+	   If set to 1, slave outputs will be processed in separate threads
+	   using the fifo muxer. This allows to compensate for different
+	   speed/latency/reliability of outputs and setup transparent
+	   recovery. By default this feature is turned off.
+
+       fifo_options
+	   Options to pass to fifo pseudo-muxer instances. See fifo.
+
+       Muxer options can be specified for each slave by prepending them as a
+       list of key=value pairs separated by ':', between square brackets. If
+       the options values contain a special character or the ':' separator,
+       they must be escaped; note that this is a second level escaping.
+
+       The following special options are also recognized:
+
+       f   Specify the format name. Required if it cannot be guessed from the
+	   output URL.
+
+       bsfs[/spec]
+	   Specify a list of bitstream filters to apply to the specified
+	   output.
+
+	   It is possible to specify to which streams a given bitstream filter
+	   applies, by appending a stream specifier to the option separated by
+	   "/". spec must be a stream specifier (see Format stream
+	   specifiers).
+
+	   If the stream specifier is not specified, the bitstream filters
+	   will be applied to all streams in the output. This will cause that
+	   output operation to fail if the output contains streams to which
+	   the bitstream filter cannot be applied e.g. "h264_mp4toannexb"
+	   being applied to an output containing an audio stream.
+
+	   Options for a bitstream filter must be specified in the form of
+	   "opt=value".
+
+	   Several bitstream filters can be specified, separated by ",".
+
+       use_fifo bool
+	   This allows to override tee muxer use_fifo option for individual
+	   slave muxer.
+
+       fifo_options
+	   This allows to override tee muxer fifo_options for individual slave
+	   muxer.  See fifo.
+
+       select
+	   Select the streams that should be mapped to the slave output,
+	   specified by a stream specifier. If not specified, this defaults to
+	   all the mapped streams. This will cause that output operation to
+	   fail if the output format does not accept all mapped streams.
+
+	   You may use multiple stream specifiers separated by commas (",")
+	   e.g.: "a:0,v"
+
+       onfail
+	   Specify behaviour on output failure. This can be set to either
+	   "abort" (which is default) or "ignore". "abort" will cause whole
+	   process to fail in case of failure on this slave output. "ignore"
+	   will ignore failure on this output, so other outputs will continue
+	   without being affected.
+
+       Examples
+
+       o   Encode something and both archive it in a WebM file and stream it
+	   as MPEG-TS over UDP:
+
+		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
+		     "archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
+
+       o   As above, but continue streaming even if output to local file fails
+	   (for example local drive fills up):
+
+		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
+		     "[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
+
+       o   Use ffmpeg to encode the input, and send the output to three
+	   different destinations. The "dump_extra" bitstream filter is used
+	   to add extradata information to all the output video keyframes
+	   packets, as requested by the MPEG-TS format. The select option is
+	   applied to out.aac in order to make it contain only audio packets.
+
+		   ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
+			  -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"
+
+       o   As above, but select only stream "a:1" for the audio output. Note
+	   that a second level escaping must be performed, as ":" is a special
+	   character used to separate options.
+
+		   ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
+			  -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"
+
+   webm_chunk
+       WebM Live Chunk Muxer.
+
+       This muxer writes out WebM headers and chunks as separate files which
+       can be consumed by clients that support WebM Live streams via DASH.
+
+       Options
+
+       This muxer supports the following options:
+
+       chunk_start_index
+	   Index of the first chunk (defaults to 0).
+
+       header
+	   Filename of the header where the initialization data will be
+	   written.
+
+       audio_chunk_duration
+	   Duration of each audio chunk in milliseconds (defaults to 5000).
+
+       Example
+
+	       ffmpeg -f v4l2 -i /dev/video0 \
+		      -f alsa -i hw:0 \
+		      -map 0:0 \
+		      -c:v libvpx-vp9 \
+		      -s 640x360 -keyint_min 30 -g 30 \
+		      -f webm_chunk \
+		      -header webm_live_video_360.hdr \
+		      -chunk_start_index 1 \
+		      webm_live_video_360_%d.chk \
+		      -map 1:0 \
+		      -c:a libvorbis \
+		      -b:a 128k \
+		      -f webm_chunk \
+		      -header webm_live_audio_128.hdr \
+		      -chunk_start_index 1 \
+		      -audio_chunk_duration 1000 \
+		      webm_live_audio_128_%d.chk
+
+   webm_dash_manifest
+       WebM DASH Manifest muxer.
+
+       This muxer implements the WebM DASH Manifest specification to generate
+       the DASH manifest XML. It also supports manifest generation for DASH
+       live streams.
+
+       For more information see:
+
+       o   WebM DASH Specification:
+	   <https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification>
+
+       o   ISO DASH Specification:
+	   <http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip>
+
+       Options
+
+       This muxer supports the following options:
+
+       adaptation_sets
+	   This option has the following syntax: "id=x,streams=a,b,c
+	   id=y,streams=d,e" where x and y are the unique identifiers of the
+	   adaptation sets and a,b,c,d and e are the indices of the
+	   corresponding audio and video streams. Any number of adaptation
+	   sets can be added using this option.
+
+       live
+	   Set this to 1 to create a live stream DASH Manifest. Default: 0.
+
+       chunk_start_index
+	   Start index of the first chunk. This will go in the startNumber
+	   attribute of the SegmentTemplate element in the manifest. Default:
+	   0.
+
+       chunk_duration_ms
+	   Duration of each chunk in milliseconds. This will go in the
+	   duration attribute of the SegmentTemplate element in the manifest.
+	   Default: 1000.
+
+       utc_timing_url
+	   URL of the page that will return the UTC timestamp in ISO format.
+	   This will go in the value attribute of the UTCTiming element in the
+	   manifest.  Default: None.
+
+       time_shift_buffer_depth
+	   Smallest time (in seconds) shifting buffer for which any
+	   Representation is guaranteed to be available. This will go in the
+	   timeShiftBufferDepth attribute of the MPD element. Default: 60.
+
+       minimum_update_period
+	   Minimum update period (in seconds) of the manifest. This will go in
+	   the minimumUpdatePeriod attribute of the MPD element. Default: 0.
+
+       Example
+
+	       ffmpeg -f webm_dash_manifest -i video1.webm \
+		      -f webm_dash_manifest -i video2.webm \
+		      -f webm_dash_manifest -i audio1.webm \
+		      -f webm_dash_manifest -i audio2.webm \
+		      -map 0 -map 1 -map 2 -map 3 \
+		      -c copy \
+		      -f webm_dash_manifest \
+		      -adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
+		      manifest.xml
+
+METADATA
+       FFmpeg is able to dump metadata from media files into a simple
+       UTF-8-encoded INI-like text file and then load it back using the
+       metadata muxer/demuxer.
+
+       The file format is as follows:
+
+       1.  A file consists of a header and a number of metadata tags divided
+	   into sections, each on its own line.
+
+       2.  The header is a ;FFMETADATA string, followed by a version number
+	   (now 1).
+
+       3.  Metadata tags are of the form key=value
+
+       4.  Immediately after header follows global metadata
+
+       5.  After global metadata there may be sections with
+	   per-stream/per-chapter metadata.
+
+       6.  A section starts with the section name in uppercase (i.e. STREAM or
+	   CHAPTER) in brackets ([, ]) and ends with next section or end of
+	   file.
+
+       7.  At the beginning of a chapter section there may be an optional
+	   timebase to be used for start/end values. It must be in form
+	   TIMEBASE=num/den, where num and den are integers. If the timebase
+	   is missing then start/end times are assumed to be in nanoseconds.
+
+	   Next a chapter section must contain chapter start and end times in
+	   form START=num, END=num, where num is a positive integer.
+
+       8.  Empty lines and lines starting with ; or # are ignored.
+
+       9.  Metadata keys or values containing special characters (=, ;, #, \
+	   and a newline) must be escaped with a backslash \.
+
+       10. Note that whitespace in metadata (e.g. foo = bar) is considered to
+	   be a part of the tag (in the example above key is foo , value is
+	    bar).
+
+       A ffmetadata file might look like this:
+
+	       ;FFMETADATA1
+	       title=bike\\shed
+	       ;this is a comment
+	       artist=FFmpeg troll team
+
+	       [CHAPTER]
+	       TIMEBASE=1/1000
+	       START=0
+	       #chapter ends at 0:01:00
+	       END=60000
+	       title=chapter \#1
+	       [STREAM]
+	       title=multi\
+	       line
+
+       By using the ffmetadata muxer and demuxer it is possible to extract
+       metadata from an input file to an ffmetadata file, and then transcode
+       the file into an output file with the edited ffmetadata file.
+
+       Extracting an ffmetadata file with ffmpeg goes as follows:
+
+	       ffmpeg -i INPUT -f ffmetadata FFMETADATAFILE
+
+       Reinserting edited metadata information from the FFMETADATAFILE file
+       can be done as:
+
+	       ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -codec copy OUTPUT
+
+PROTOCOL OPTIONS
+       The libavformat library provides some generic global options, which can
+       be set on all the protocols. In addition each protocol may support so-
+       called private options, which are specific for that component.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the "AVFormatContext" options or
+       using the libavutil/opt.h API for programmatic use.
+
+       The list of supported options follows:
+
+       protocol_whitelist list (input)
+	   Set a ","-separated list of allowed protocols. "ALL" matches all
+	   protocols. Protocols prefixed by "-" are disabled.  All protocols
+	   are allowed by default but protocols used by an another protocol
+	   (nested protocols) are restricted to a per protocol subset.
+
+PROTOCOLS
+       Protocols are configured elements in FFmpeg that enable access to
+       resources that require specific protocols.
+
+       When you configure your FFmpeg build, all the supported protocols are
+       enabled by default. You can list all available ones using the configure
+       option "--list-protocols".
+
+       You can disable all the protocols using the configure option
+       "--disable-protocols", and selectively enable a protocol using the
+       option "--enable-protocol=PROTOCOL", or you can disable a particular
+       protocol using the option "--disable-protocol=PROTOCOL".
+
+       The option "-protocols" of the ff* tools will display the list of
+       supported protocols.
+
+       All protocols accept the following options:
+
+       rw_timeout
+	   Maximum time to wait for (network) read/write operations to
+	   complete, in microseconds.
+
+       A description of the currently available protocols follows.
+
+   amqp
+       Advanced Message Queueing Protocol (AMQP) version 0-9-1 is a broker
+       based publish-subscribe communication protocol.
+
+       FFmpeg must be compiled with --enable-librabbitmq to support AMQP. A
+       separate AMQP broker must also be run. An example open-source AMQP
+       broker is RabbitMQ.
+
+       After starting the broker, an FFmpeg client may stream data to the
+       broker using the command:
+
+	       ffmpeg -re -i input -f mpegts amqp://[[user]:[password]@]hostname[:port][/vhost]
+
+       Where hostname and port (default is 5672) is the address of the broker.
+       The client may also set a user/password for authentication. The default
+       for both fields is "guest". Name of virtual host on broker can be set
+       with vhost. The default value is "/".
+
+       Muliple subscribers may stream from the broker using the command:
+
+	       ffplay amqp://[[user]:[password]@]hostname[:port][/vhost]
+
+       In RabbitMQ all data published to the broker flows through a specific
+       exchange, and each subscribing client has an assigned queue/buffer.
+       When a packet arrives at an exchange, it may be copied to a client's
+       queue depending on the exchange and routing_key fields.
+
+       The following options are supported:
+
+       exchange
+	   Sets the exchange to use on the broker. RabbitMQ has several
+	   predefined exchanges: "amq.direct" is the default exchange, where
+	   the publisher and subscriber must have a matching routing_key;
+	   "amq.fanout" is the same as a broadcast operation (i.e. the data is
+	   forwarded to all queues on the fanout exchange independent of the
+	   routing_key); and "amq.topic" is similar to "amq.direct", but
+	   allows for more complex pattern matching (refer to the RabbitMQ
+	   documentation).
+
+       routing_key
+	   Sets the routing key. The default value is "amqp". The routing key
+	   is used on the "amq.direct" and "amq.topic" exchanges to decide
+	   whether packets are written to the queue of a subscriber.
+
+       pkt_size
+	   Maximum size of each packet sent/received to the broker. Default is
+	   131072.  Minimum is 4096 and max is any large value (representable
+	   by an int). When receiving packets, this sets an internal buffer
+	   size in FFmpeg. It should be equal to or greater than the size of
+	   the published packets to the broker. Otherwise the received message
+	   may be truncated causing decoding errors.
+
+       connection_timeout
+	   The timeout in seconds during the initial connection to the broker.
+	   The default value is rw_timeout, or 5 seconds if rw_timeout is not
+	   set.
+
+       delivery_mode mode
+	   Sets the delivery mode of each message sent to broker.  The
+	   following values are accepted:
+
+	   persistent
+	       Delivery mode set to "persistent" (2). This is the default
+	       value.  Messages may be written to the broker's disk depending
+	       on its setup.
+
+	   non-persistent
+	       Delivery mode set to "non-persistent" (1).  Messages will stay
+	       in broker's memory unless the broker is under memory pressure.
+
+   async
+       Asynchronous data filling wrapper for input stream.
+
+       Fill data in a background thread, to decouple I/O operation from demux
+       thread.
+
+	       async:<URL>
+	       async:http://host/resource
+	       async:cache:http://host/resource
+
+   bluray
+       Read BluRay playlist.
+
+       The accepted options are:
+
+       angle
+	   BluRay angle
+
+       chapter
+	   Start chapter (1...N)
+
+       playlist
+	   Playlist to read (BDMV/PLAYLIST/?????.mpls)
+
+       Examples:
+
+       Read longest playlist from BluRay mounted to /mnt/bluray:
+
+	       bluray:/mnt/bluray
+
+       Read angle 2 of playlist 4 from BluRay mounted to /mnt/bluray, start
+       from chapter 2:
+
+	       -playlist 4 -angle 2 -chapter 2 bluray:/mnt/bluray
+
+   cache
+       Caching wrapper for input stream.
+
+       Cache the input stream to temporary file. It brings seeking capability
+       to live streams.
+
+       The accepted options are:
+
+       read_ahead_limit
+	   Amount in bytes that may be read ahead when seeking isn't
+	   supported. Range is -1 to INT_MAX.  -1 for unlimited. Default is
+	   65536.
+
+       URL Syntax is
+
+	       cache:<URL>
+
+   concat
+       Physical concatenation protocol.
+
+       Read and seek from many resources in sequence as if they were a unique
+       resource.
+
+       A URL accepted by this protocol has the syntax:
+
+	       concat:<URL1>|<URL2>|...|<URLN>
+
+       where URL1, URL2, ..., URLN are the urls of the resource to be
+       concatenated, each one possibly specifying a distinct protocol.
+
+       For example to read a sequence of files split1.mpeg, split2.mpeg,
+       split3.mpeg with ffplay use the command:
+
+	       ffplay concat:split1.mpeg\|split2.mpeg\|split3.mpeg
+
+       Note that you may need to escape the character "|" which is special for
+       many shells.
+
+   concatf
+       Physical concatenation protocol using a line break delimited list of
+       resources.
+
+       Read and seek from many resources in sequence as if they were a unique
+       resource.
+
+       A URL accepted by this protocol has the syntax:
+
+	       concatf:<URL>
+
+       where URL is the url containing a line break delimited list of
+       resources to be concatenated, each one possibly specifying a distinct
+       protocol. Special characters must be escaped with backslash or single
+       quotes. See the "Quoting and escaping" section in the ffmpeg-utils(1)
+       manual.
+
+       For example to read a sequence of files split1.mpeg, split2.mpeg,
+       split3.mpeg listed in separate lines within a file split.txt with
+       ffplay use the command:
+
+	       ffplay concatf:split.txt
+
+       Where split.txt contains the lines:
+
+	       split1.mpeg
+	       split2.mpeg
+	       split3.mpeg
+
+   crypto
+       AES-encrypted stream reading protocol.
+
+       The accepted options are:
+
+       key Set the AES decryption key binary block from given hexadecimal
+	   representation.
+
+       iv  Set the AES decryption initialization vector binary block from
+	   given hexadecimal representation.
+
+       Accepted URL formats:
+
+	       crypto:<URL>
+	       crypto+<URL>
+
+   data
+       Data in-line in the URI. See
+       <http://en.wikipedia.org/wiki/Data_URI_scheme>.
+
+       For example, to convert a GIF file given inline with ffmpeg:
+
+	       ffmpeg -i "data:image/gif;base64,R0lGODdhCAAIAMIEAAAAAAAA//8AAP//AP///////////////ywAAAAACAAIAAADF0gEDLojDgdGiJdJqUX02iB4E8Q9jUMkADs=" smiley.png
+
+   fd
+       File descriptor access protocol.
+
+       The accepted syntax is:
+
+	       fd: -fd <file_descriptor>
+
+       If fd is not specified, by default the stdout file descriptor will be
+       used for writing, stdin for reading. Unlike the pipe protocol, fd
+       protocol has seek support if it corresponding to a regular file. fd
+       protocol doesn't support pass file descriptor via URL for security.
+
+       This protocol accepts the following options:
+
+       blocksize
+	   Set I/O operation maximum block size, in bytes. Default value is
+	   "INT_MAX", which results in not limiting the requested block size.
+	   Setting this value reasonably low improves user termination request
+	   reaction time, which is valuable if data transmission is slow.
+
+       fd  Set file descriptor.
+
+   file
+       File access protocol.
+
+       Read from or write to a file.
+
+       A file URL can have the form:
+
+	       file:<filename>
+
+       where filename is the path of the file to read.
+
+       An URL that does not have a protocol prefix will be assumed to be a
+       file URL. Depending on the build, an URL that looks like a Windows path
+       with the drive letter at the beginning will also be assumed to be a
+       file URL (usually not the case in builds for unix-like systems).
+
+       For example to read from a file input.mpeg with ffmpeg use the command:
+
+	       ffmpeg -i file:input.mpeg output.mpeg
+
+       This protocol accepts the following options:
+
+       truncate
+	   Truncate existing files on write, if set to 1. A value of 0
+	   prevents truncating. Default value is 1.
+
+       blocksize
+	   Set I/O operation maximum block size, in bytes. Default value is
+	   "INT_MAX", which results in not limiting the requested block size.
+	   Setting this value reasonably low improves user termination request
+	   reaction time, which is valuable for files on slow medium.
+
+       follow
+	   If set to 1, the protocol will retry reading at the end of the
+	   file, allowing reading files that still are being written. In order
+	   for this to terminate, you either need to use the rw_timeout
+	   option, or use the interrupt callback (for API users).
+
+       seekable
+	   Controls if seekability is advertised on the file. 0 means non-
+	   seekable, -1 means auto (seekable for normal files, non-seekable
+	   for named pipes).
+
+	   Many demuxers handle seekable and non-seekable resources
+	   differently, overriding this might speed up opening certain files
+	   at the cost of losing some features (e.g. accurate seeking).
+
+   ftp
+       FTP (File Transfer Protocol).
+
+       Read from or write to remote resources using FTP protocol.
+
+       Following syntax is required.
+
+	       ftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg
+
+       This protocol accepts the following options.
+
+       timeout
+	   Set timeout in microseconds of socket I/O operations used by the
+	   underlying low level operation. By default it is set to -1, which
+	   means that the timeout is not specified.
+
+       ftp-user
+	   Set a user to be used for authenticating to the FTP server. This is
+	   overridden by the user in the FTP URL.
+
+       ftp-password
+	   Set a password to be used for authenticating to the FTP server.
+	   This is overridden by the password in the FTP URL, or by ftp-
+	   anonymous-password if no user is set.
+
+       ftp-anonymous-password
+	   Password used when login as anonymous user. Typically an e-mail
+	   address should be used.
+
+       ftp-write-seekable
+	   Control seekability of connection during encoding. If set to 1 the
+	   resource is supposed to be seekable, if set to 0 it is assumed not
+	   to be seekable. Default value is 0.
+
+       NOTE: Protocol can be used as output, but it is recommended to not do
+       it, unless special care is taken (tests, customized server
+       configuration etc.). Different FTP servers behave in different way
+       during seek operation. ff* tools may produce incomplete content due to
+       server limitations.
+
+   gopher
+       Gopher protocol.
+
+   gophers
+       Gophers protocol.
+
+       The Gopher protocol with TLS encapsulation.
+
+   hls
+       Read Apple HTTP Live Streaming compliant segmented stream as a uniform
+       one. The M3U8 playlists describing the segments can be remote HTTP
+       resources or local files, accessed using the standard file protocol.
+       The nested protocol is declared by specifying "+proto" after the hls
+       URI scheme name, where proto is either "file" or "http".
+
+	       hls+http://host/path/to/remote/resource.m3u8
+	       hls+file://path/to/local/resource.m3u8
+
+       Using this protocol is discouraged - the hls demuxer should work just
+       as well (if not, please report the issues) and is more complete.  To
+       use the hls demuxer instead, simply use the direct URLs to the m3u8
+       files.
+
+   http
+       HTTP (Hyper Text Transfer Protocol).
+
+       This protocol accepts the following options:
+
+       seekable
+	   Control seekability of connection. If set to 1 the resource is
+	   supposed to be seekable, if set to 0 it is assumed not to be
+	   seekable, if set to -1 it will try to autodetect if it is seekable.
+	   Default value is -1.
+
+       chunked_post
+	   If set to 1 use chunked Transfer-Encoding for posts, default is 1.
+
+       content_type
+	   Set a specific content type for the POST messages or for listen
+	   mode.
+
+       http_proxy
+	   set HTTP proxy to tunnel through e.g. http://example.com:1234
+
+       headers
+	   Set custom HTTP headers, can override built in default headers. The
+	   value must be a string encoding the headers.
+
+       multiple_requests
+	   Use persistent connections if set to 1, default is 0.
+
+       post_data
+	   Set custom HTTP post data.
+
+       referer
+	   Set the Referer header. Include 'Referer: URL' header in HTTP
+	   request.
+
+       user_agent
+	   Override the User-Agent header. If not specified the protocol will
+	   use a string describing the libavformat build. ("Lavf/<version>")
+
+       reconnect_at_eof
+	   If set then eof is treated like an error and causes reconnection,
+	   this is useful for live / endless streams.
+
+       reconnect_streamed
+	   If set then even streamed/non seekable streams will be reconnected
+	   on errors.
+
+       reconnect_on_network_error
+	   Reconnect automatically in case of TCP/TLS errors during connect.
+
+       reconnect_on_http_error
+	   A comma separated list of HTTP status codes to reconnect on. The
+	   list can include specific status codes (e.g. '503') or the strings
+	   '4xx' / '5xx'.
+
+       reconnect_delay_max
+	   Sets the maximum delay in seconds after which to give up
+	   reconnecting
+
+       mime_type
+	   Export the MIME type.
+
+       http_version
+	   Exports the HTTP response version number. Usually "1.0" or "1.1".
+
+       icy If set to 1 request ICY (SHOUTcast) metadata from the server. If
+	   the server supports this, the metadata has to be retrieved by the
+	   application by reading the icy_metadata_headers and
+	   icy_metadata_packet options.  The default is 1.
+
+       icy_metadata_headers
+	   If the server supports ICY metadata, this contains the ICY-specific
+	   HTTP reply headers, separated by newline characters.
+
+       icy_metadata_packet
+	   If the server supports ICY metadata, and icy was set to 1, this
+	   contains the last non-empty metadata packet sent by the server. It
+	   should be polled in regular intervals by applications interested in
+	   mid-stream metadata updates.
+
+       cookies
+	   Set the cookies to be sent in future requests. The format of each
+	   cookie is the same as the value of a Set-Cookie HTTP response
+	   field. Multiple cookies can be delimited by a newline character.
+
+       offset
+	   Set initial byte offset.
+
+       end_offset
+	   Try to limit the request to bytes preceding this offset.
+
+       method
+	   When used as a client option it sets the HTTP method for the
+	   request.
+
+	   When used as a server option it sets the HTTP method that is going
+	   to be expected from the client(s).  If the expected and the
+	   received HTTP method do not match the client will be given a Bad
+	   Request response.  When unset the HTTP method is not checked for
+	   now. This will be replaced by autodetection in the future.
+
+       listen
+	   If set to 1 enables experimental HTTP server. This can be used to
+	   send data when used as an output option, or read data from a client
+	   with HTTP POST when used as an input option.  If set to 2 enables
+	   experimental multi-client HTTP server. This is not yet implemented
+	   in ffmpeg.c and thus must not be used as a command line option.
+
+		   # Server side (sending):
+		   ffmpeg -i somefile.ogg -c copy -listen 1 -f ogg http://<server>:<port>
+
+		   # Client side (receiving):
+		   ffmpeg -i http://<server>:<port> -c copy somefile.ogg
+
+		   # Client can also be done with wget:
+		   wget http://<server>:<port> -O somefile.ogg
+
+		   # Server side (receiving):
+		   ffmpeg -listen 1 -i http://<server>:<port> -c copy somefile.ogg
+
+		   # Client side (sending):
+		   ffmpeg -i somefile.ogg -chunked_post 0 -c copy -f ogg http://<server>:<port>
+
+		   # Client can also be done with wget:
+		   wget --post-file=somefile.ogg http://<server>:<port>
+
+       send_expect_100
+	   Send an Expect: 100-continue header for POST. If set to 1 it will
+	   send, if set to 0 it won't, if set to -1 it will try to send if it
+	   is applicable. Default value is -1.
+
+       auth_type
+	   Set HTTP authentication type. No option for Digest, since this
+	   method requires getting nonce parameters from the server first and
+	   can't be used straight away like Basic.
+
+	   none
+	       Choose the HTTP authentication type automatically. This is the
+	       default.
+
+	   basic
+	       Choose the HTTP basic authentication.
+
+	       Basic authentication sends a Base64-encoded string that
+	       contains a user name and password for the client. Base64 is not
+	       a form of encryption and should be considered the same as
+	       sending the user name and password in clear text (Base64 is a
+	       reversible encoding).  If a resource needs to be protected,
+	       strongly consider using an authentication scheme other than
+	       basic authentication. HTTPS/TLS should be used with basic
+	       authentication.	Without these additional security
+	       enhancements, basic authentication should not be used to
+	       protect sensitive or valuable information.
+
+       HTTP Cookies
+
+       Some HTTP requests will be denied unless cookie values are passed in
+       with the request. The cookies option allows these cookies to be
+       specified. At the very least, each cookie must specify a value along
+       with a path and domain.	HTTP requests that match both the domain and
+       path will automatically include the cookie value in the HTTP Cookie
+       header field. Multiple cookies can be delimited by a newline.
+
+       The required syntax to play a stream specifying a cookie is:
+
+	       ffplay -cookies "nlqptid=nltid=tsn; path=/; domain=somedomain.com;" http://somedomain.com/somestream.m3u8
+
+   Icecast
+       Icecast protocol (stream to Icecast servers)
+
+       This protocol accepts the following options:
+
+       ice_genre
+	   Set the stream genre.
+
+       ice_name
+	   Set the stream name.
+
+       ice_description
+	   Set the stream description.
+
+       ice_url
+	   Set the stream website URL.
+
+       ice_public
+	   Set if the stream should be public.	The default is 0 (not public).
+
+       user_agent
+	   Override the User-Agent header. If not specified a string of the
+	   form "Lavf/<version>" will be used.
+
+       password
+	   Set the Icecast mountpoint password.
+
+       content_type
+	   Set the stream content type. This must be set if it is different
+	   from audio/mpeg.
+
+       legacy_icecast
+	   This enables support for Icecast versions < 2.4.0, that do not
+	   support the HTTP PUT method but the SOURCE method.
+
+       tls Establish a TLS (HTTPS) connection to Icecast.
+
+	       icecast://[<username>[:<password>]@]<server>:<port>/<mountpoint>
+
+   ipfs
+       InterPlanetary File System (IPFS) protocol support. One can access
+       files stored on the IPFS network through so-called gateways. These are
+       http(s) endpoints.  This protocol wraps the IPFS native protocols
+       (ipfs:// and ipns://) to be sent to such a gateway. Users can (and
+       should) host their own node which means this protocol will use one's
+       local gateway to access files on the IPFS network.
+
+       This protocol accepts the following options:
+
+       gateway
+	   Defines the gateway to use. When not set, the protocol will first
+	   try locating the local gateway by looking at $IPFS_GATEWAY,
+	   $IPFS_PATH and "$HOME/.ipfs/", in that order.
+
+       One can use this protocol in 2 ways. Using IPFS:
+
+	       ffplay ipfs://<hash>
+
+       Or the IPNS protocol (IPNS is mutable IPFS):
+
+	       ffplay ipns://<hash>
+
+   mmst
+       MMS (Microsoft Media Server) protocol over TCP.
+
+   mmsh
+       MMS (Microsoft Media Server) protocol over HTTP.
+
+       The required syntax is:
+
+	       mmsh://<server>[:<port>][/<app>][/<playpath>]
+
+   md5
+       MD5 output protocol.
+
+       Computes the MD5 hash of the data to be written, and on close writes
+       this to the designated output or stdout if none is specified. It can be
+       used to test muxers without writing an actual file.
+
+       Some examples follow.
+
+	       # Write the MD5 hash of the encoded AVI file to the file output.avi.md5.
+	       ffmpeg -i input.flv -f avi -y md5:output.avi.md5
+
+	       # Write the MD5 hash of the encoded AVI file to stdout.
+	       ffmpeg -i input.flv -f avi -y md5:
+
+       Note that some formats (typically MOV) require the output protocol to
+       be seekable, so they will fail with the MD5 output protocol.
+
+   pipe
+       UNIX pipe access protocol.
+
+       Read and write from UNIX pipes.
+
+       The accepted syntax is:
+
+	       pipe:[<number>]
+
+       If fd isn't specified, number is the number corresponding to the file
+       descriptor of the pipe (e.g. 0 for stdin, 1 for stdout, 2 for stderr).
+       If number is not specified, by default the stdout file descriptor will
+       be used for writing, stdin for reading.
+
+       For example to read from stdin with ffmpeg:
+
+	       cat test.wav | ffmpeg -i pipe:0
+	       # ...this is the same as...
+	       cat test.wav | ffmpeg -i pipe:
+
+       For writing to stdout with ffmpeg:
+
+	       ffmpeg -i test.wav -f avi pipe:1 | cat > test.avi
+	       # ...this is the same as...
+	       ffmpeg -i test.wav -f avi pipe: | cat > test.avi
+
+       This protocol accepts the following options:
+
+       blocksize
+	   Set I/O operation maximum block size, in bytes. Default value is
+	   "INT_MAX", which results in not limiting the requested block size.
+	   Setting this value reasonably low improves user termination request
+	   reaction time, which is valuable if data transmission is slow.
+
+       fd  Set file descriptor.
+
+       Note that some formats (typically MOV), require the output protocol to
+       be seekable, so they will fail with the pipe output protocol.
+
+   prompeg
+       Pro-MPEG Code of Practice #3 Release 2 FEC protocol.
+
+       The Pro-MPEG CoP#3 FEC is a 2D parity-check forward error correction
+       mechanism for MPEG-2 Transport Streams sent over RTP.
+
+       This protocol must be used in conjunction with the "rtp_mpegts" muxer
+       and the "rtp" protocol.
+
+       The required syntax is:
+
+	       -f rtp_mpegts -fec prompeg=<option>=<val>... rtp://<hostname>:<port>
+
+       The destination UDP ports are "port + 2" for the column FEC stream and
+       "port + 4" for the row FEC stream.
+
+       This protocol accepts the following options:
+
+       l=n The number of columns (4-20, LxD <= 100)
+
+       d=n The number of rows (4-20, LxD <= 100)
+
+       Example usage:
+
+	       -f rtp_mpegts -fec prompeg=l=8:d=4 rtp://<hostname>:<port>
+
+   rist
+       Reliable Internet Streaming Transport protocol
+
+       The accepted options are:
+
+       rist_profile
+	   Supported values:
+
+	   simple
+	   main
+	       This one is default.
+
+	   advanced
+       buffer_size
+	   Set internal RIST buffer size in milliseconds for retransmission of
+	   data.  Default value is 0 which means the librist default (1 sec).
+	   Maximum value is 30 seconds.
+
+       fifo_size
+	   Size of the librist receiver output fifo in number of packets. This
+	   must be a power of 2.  Defaults to 8192 (vs the librist default of
+	   1024).
+
+       overrun_nonfatal=1|0
+	   Survive in case of librist fifo buffer overrun. Default value is 0.
+
+       pkt_size
+	   Set maximum packet size for sending data. 1316 by default.
+
+       log_level
+	   Set loglevel for RIST logging messages. You only need to set this
+	   if you explicitly want to enable debug level messages or packet
+	   loss simulation, otherwise the regular loglevel is respected.
+
+       secret
+	   Set override of encryption secret, by default is unset.
+
+       encryption
+	   Set encryption type, by default is disabled.  Acceptable values are
+	   128 and 256.
+
+   rtmp
+       Real-Time Messaging Protocol.
+
+       The Real-Time Messaging Protocol (RTMP) is used for streaming
+       multimedia content across a TCP/IP network.
+
+       The required syntax is:
+
+	       rtmp://[<username>:<password>@]<server>[:<port>][/<app>][/<instance>][/<playpath>]
+
+       The accepted parameters are:
+
+       username
+	   An optional username (mostly for publishing).
+
+       password
+	   An optional password (mostly for publishing).
+
+       server
+	   The address of the RTMP server.
+
+       port
+	   The number of the TCP port to use (by default is 1935).
+
+       app It is the name of the application to access. It usually corresponds
+	   to the path where the application is installed on the RTMP server
+	   (e.g. /ondemand/, /flash/live/, etc.). You can override the value
+	   parsed from the URI through the "rtmp_app" option, too.
+
+       playpath
+	   It is the path or name of the resource to play with reference to
+	   the application specified in app, may be prefixed by "mp4:". You
+	   can override the value parsed from the URI through the
+	   "rtmp_playpath" option, too.
+
+       listen
+	   Act as a server, listening for an incoming connection.
+
+       timeout
+	   Maximum time to wait for the incoming connection. Implies listen.
+
+       Additionally, the following parameters can be set via command line
+       options (or in code via "AVOption"s):
+
+       rtmp_app
+	   Name of application to connect on the RTMP server. This option
+	   overrides the parameter specified in the URI.
+
+       rtmp_buffer
+	   Set the client buffer time in milliseconds. The default is 3000.
+
+       rtmp_conn
+	   Extra arbitrary AMF connection parameters, parsed from a string,
+	   e.g. like "B:1 S:authMe O:1 NN:code:1.23 NS:flag:ok O:0".  Each
+	   value is prefixed by a single character denoting the type, B for
+	   Boolean, N for number, S for string, O for object, or Z for null,
+	   followed by a colon. For Booleans the data must be either 0 or 1
+	   for FALSE or TRUE, respectively.  Likewise for Objects the data
+	   must be 0 or 1 to end or begin an object, respectively. Data items
+	   in subobjects may be named, by prefixing the type with 'N' and
+	   specifying the name before the value (i.e. "NB:myFlag:1"). This
+	   option may be used multiple times to construct arbitrary AMF
+	   sequences.
+
+       rtmp_enhanced_codecs
+	   Specify the list of codecs the client advertises to support in an
+	   enhanced RTMP stream. This option should be set to a comma
+	   separated list of fourcc values, like "hvc1,av01,vp09" for multiple
+	   codecs or "hvc1" for only one codec. The specified list will be
+	   presented in the "fourCcLive" property of the Connect Command
+	   Message.
+
+       rtmp_flashver
+	   Version of the Flash plugin used to run the SWF player. The default
+	   is LNX 9,0,124,2. (When publishing, the default is FMLE/3.0
+	   (compatible; <libavformat version>).)
+
+       rtmp_flush_interval
+	   Number of packets flushed in the same request (RTMPT only). The
+	   default is 10.
+
+       rtmp_live
+	   Specify that the media is a live stream. No resuming or seeking in
+	   live streams is possible. The default value is "any", which means
+	   the subscriber first tries to play the live stream specified in the
+	   playpath. If a live stream of that name is not found, it plays the
+	   recorded stream. The other possible values are "live" and
+	   "recorded".
+
+       rtmp_pageurl
+	   URL of the web page in which the media was embedded. By default no
+	   value will be sent.
+
+       rtmp_playpath
+	   Stream identifier to play or to publish. This option overrides the
+	   parameter specified in the URI.
+
+       rtmp_subscribe
+	   Name of live stream to subscribe to. By default no value will be
+	   sent.  It is only sent if the option is specified or if rtmp_live
+	   is set to live.
+
+       rtmp_swfhash
+	   SHA256 hash of the decompressed SWF file (32 bytes).
+
+       rtmp_swfsize
+	   Size of the decompressed SWF file, required for SWFVerification.
+
+       rtmp_swfurl
+	   URL of the SWF player for the media. By default no value will be
+	   sent.
+
+       rtmp_swfverify
+	   URL to player swf file, compute hash/size automatically.
+
+       rtmp_tcurl
+	   URL of the target stream. Defaults to proto://host[:port]/app.
+
+       tcp_nodelay=1|0
+	   Set TCP_NODELAY to disable Nagle's algorithm. Default value is 0.
+
+	   Remark: Writing to the socket is currently not optimized to
+	   minimize system calls and reduces the efficiency / effect of
+	   TCP_NODELAY.
+
+       For example to read with ffplay a multimedia resource named "sample"
+       from the application "vod" from an RTMP server "myserver":
+
+	       ffplay rtmp://myserver/vod/sample
+
+       To publish to a password protected server, passing the playpath and app
+       names separately:
+
+	       ffmpeg -re -i <input> -f flv -rtmp_playpath some/long/path -rtmp_app long/app/name rtmp://username:password@myserver/
+
+   rtmpe
+       Encrypted Real-Time Messaging Protocol.
+
+       The Encrypted Real-Time Messaging Protocol (RTMPE) is used for
+       streaming multimedia content within standard cryptographic primitives,
+       consisting of Diffie-Hellman key exchange and HMACSHA256, generating a
+       pair of RC4 keys.
+
+   rtmps
+       Real-Time Messaging Protocol over a secure SSL connection.
+
+       The Real-Time Messaging Protocol (RTMPS) is used for streaming
+       multimedia content across an encrypted connection.
+
+   rtmpt
+       Real-Time Messaging Protocol tunneled through HTTP.
+
+       The Real-Time Messaging Protocol tunneled through HTTP (RTMPT) is used
+       for streaming multimedia content within HTTP requests to traverse
+       firewalls.
+
+   rtmpte
+       Encrypted Real-Time Messaging Protocol tunneled through HTTP.
+
+       The Encrypted Real-Time Messaging Protocol tunneled through HTTP
+       (RTMPTE) is used for streaming multimedia content within HTTP requests
+       to traverse firewalls.
+
+   rtmpts
+       Real-Time Messaging Protocol tunneled through HTTPS.
+
+       The Real-Time Messaging Protocol tunneled through HTTPS (RTMPTS) is
+       used for streaming multimedia content within HTTPS requests to traverse
+       firewalls.
+
+   libsmbclient
+       libsmbclient permits one to manipulate CIFS/SMB network resources.
+
+       Following syntax is required.
+
+	       smb://[[domain:]user[:password@]]server[/share[/path[/file]]]
+
+       This protocol accepts the following options.
+
+       timeout
+	   Set timeout in milliseconds of socket I/O operations used by the
+	   underlying low level operation. By default it is set to -1, which
+	   means that the timeout is not specified.
+
+       truncate
+	   Truncate existing files on write, if set to 1. A value of 0
+	   prevents truncating. Default value is 1.
+
+       workgroup
+	   Set the workgroup used for making connections. By default workgroup
+	   is not specified.
+
+       For more information see: <http://www.samba.org/>.
+
+   libssh
+       Secure File Transfer Protocol via libssh
+
+       Read from or write to remote resources using SFTP protocol.
+
+       Following syntax is required.
+
+	       sftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg
+
+       This protocol accepts the following options.
+
+       timeout
+	   Set timeout of socket I/O operations used by the underlying low
+	   level operation. By default it is set to -1, which means that the
+	   timeout is not specified.
+
+       truncate
+	   Truncate existing files on write, if set to 1. A value of 0
+	   prevents truncating. Default value is 1.
+
+       private_key
+	   Specify the path of the file containing private key to use during
+	   authorization.  By default libssh searches for keys in the ~/.ssh/
+	   directory.
+
+       Example: Play a file stored on remote server.
+
+	       ffplay sftp://user:password@server_address:22/home/user/resource.mpeg
+
+   librtmp rtmp, rtmpe, rtmps, rtmpt, rtmpte
+       Real-Time Messaging Protocol and its variants supported through
+       librtmp.
+
+       Requires the presence of the librtmp headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-librtmp". If enabled this will replace the native RTMP
+       protocol.
+
+       This protocol provides most client functions and a few server functions
+       needed to support RTMP, RTMP tunneled in HTTP (RTMPT), encrypted RTMP
+       (RTMPE), RTMP over SSL/TLS (RTMPS) and tunneled variants of these
+       encrypted types (RTMPTE, RTMPTS).
+
+       The required syntax is:
+
+	       <rtmp_proto>://<server>[:<port>][/<app>][/<playpath>] <options>
+
+       where rtmp_proto is one of the strings "rtmp", "rtmpt", "rtmpe",
+       "rtmps", "rtmpte", "rtmpts" corresponding to each RTMP variant, and
+       server, port, app and playpath have the same meaning as specified for
+       the RTMP native protocol.  options contains a list of space-separated
+       options of the form key=val.
+
+       See the librtmp manual page (man 3 librtmp) for more information.
+
+       For example, to stream a file in real-time to an RTMP server using
+       ffmpeg:
+
+	       ffmpeg -re -i myfile -f flv rtmp://myserver/live/mystream
+
+       To play the same stream using ffplay:
+
+	       ffplay "rtmp://myserver/live/mystream live=1"
+
+   rtp
+       Real-time Transport Protocol.
+
+       The required syntax for an RTP URL is:
+       rtp://hostname[:port][?option=val...]
+
+       port specifies the RTP port to use.
+
+       The following URL options are supported:
+
+       ttl=n
+	   Set the TTL (Time-To-Live) value (for multicast only).
+
+       rtcpport=n
+	   Set the remote RTCP port to n.
+
+       localrtpport=n
+	   Set the local RTP port to n.
+
+       localrtcpport=n'
+	   Set the local RTCP port to n.
+
+       pkt_size=n
+	   Set max packet size (in bytes) to n.
+
+       buffer_size=size
+	   Set the maximum UDP socket buffer size in bytes.
+
+       connect=0|1
+	   Do a "connect()" on the UDP socket (if set to 1) or not (if set to
+	   0).
+
+       sources=ip[,ip]
+	   List allowed source IP addresses.
+
+       block=ip[,ip]
+	   List disallowed (blocked) source IP addresses.
+
+       write_to_source=0|1
+	   Send packets to the source address of the latest received packet
+	   (if set to 1) or to a default remote address (if set to 0).
+
+       localport=n
+	   Set the local RTP port to n.
+
+       localaddr=addr
+	   Local IP address of a network interface used for sending packets or
+	   joining multicast groups.
+
+       timeout=n
+	   Set timeout (in microseconds) of socket I/O operations to n.
+
+	   This is a deprecated option. Instead, localrtpport should be used.
+
+       Important notes:
+
+       1.  If rtcpport is not set the RTCP port will be set to the RTP port
+	   value plus 1.
+
+       2.  If localrtpport (the local RTP port) is not set any available port
+	   will be used for the local RTP and RTCP ports.
+
+       3.  If localrtcpport (the local RTCP port) is not set it will be set to
+	   the local RTP port value plus 1.
+
+   rtsp
+       Real-Time Streaming Protocol.
+
+       RTSP is not technically a protocol handler in libavformat, it is a
+       demuxer and muxer. The demuxer supports both normal RTSP (with data
+       transferred over RTP; this is used by e.g. Apple and Microsoft) and
+       Real-RTSP (with data transferred over RDT).
+
+       The muxer can be used to send a stream using RTSP ANNOUNCE to a server
+       supporting it (currently Darwin Streaming Server and Mischa
+       Spiegelmock's <https://github.com/revmischa/rtsp-server>).
+
+       The required syntax for a RTSP url is:
+
+	       rtsp://<hostname>[:<port>]/<path>
+
+       Options can be set on the ffmpeg/ffplay command line, or set in code
+       via "AVOption"s or in "avformat_open_input".
+
+       Muxer
+
+       The following options are supported.
+
+       rtsp_transport
+	   Set RTSP transport protocols.
+
+	   It accepts the following values:
+
+	   udp Use UDP as lower transport protocol.
+
+	   tcp Use TCP (interleaving within the RTSP control channel) as lower
+	       transport protocol.
+
+	   Default value is 0.
+
+       rtsp_flags
+	   Set RTSP flags.
+
+	   The following values are accepted:
+
+	   latm
+	       Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC.
+
+	   rfc2190
+	       Use RFC 2190 packetization instead of RFC 4629 for H.263.
+
+	   skip_rtcp
+	       Don't send RTCP sender reports.
+
+	   h264_mode0
+	       Use mode 0 for H.264 in RTP.
+
+	   send_bye
+	       Send RTCP BYE packets when finishing.
+
+	   Default value is 0.
+
+       min_port
+	   Set minimum local UDP port. Default value is 5000.
+
+       max_port
+	   Set maximum local UDP port. Default value is 65000.
+
+       buffer_size
+	   Set the maximum socket buffer size in bytes.
+
+       pkt_size
+	   Set max send packet size (in bytes). Default value is 1472.
+
+       Demuxer
+
+       The following options are supported.
+
+       initial_pause
+	   Do not start playing the stream immediately if set to 1. Default
+	   value is 0.
+
+       rtsp_transport
+	   Set RTSP transport protocols.
+
+	   It accepts the following values:
+
+	   udp Use UDP as lower transport protocol.
+
+	   tcp Use TCP (interleaving within the RTSP control channel) as lower
+	       transport protocol.
+
+	   udp_multicast
+	       Use UDP multicast as lower transport protocol.
+
+	   http
+	       Use HTTP tunneling as lower transport protocol, which is useful
+	       for passing proxies.
+
+	   https
+	       Use HTTPs tunneling as lower transport protocol, which is
+	       useful for passing proxies and widely used for security
+	       consideration.
+
+	   Multiple lower transport protocols may be specified, in that case
+	   they are tried one at a time (if the setup of one fails, the next
+	   one is tried).  For the muxer, only the tcp and udp options are
+	   supported.
+
+       rtsp_flags
+	   Set RTSP flags.
+
+	   The following values are accepted:
+
+	   filter_src
+	       Accept packets only from negotiated peer address and port.
+
+	   listen
+	       Act as a server, listening for an incoming connection.
+
+	   prefer_tcp
+	       Try TCP for RTP transport first, if TCP is available as RTSP
+	       RTP transport.
+
+	   satip_raw
+	       Export raw MPEG-TS stream instead of demuxing. The flag will
+	       simply write out the raw stream, with the original PAT/PMT/PIDs
+	       intact.
+
+	   Default value is none.
+
+       allowed_media_types
+	   Set media types to accept from the server.
+
+	   The following flags are accepted:
+
+	   video
+	   audio
+	   data
+	   subtitle
+
+	   By default it accepts all media types.
+
+       min_port
+	   Set minimum local UDP port. Default value is 5000.
+
+       max_port
+	   Set maximum local UDP port. Default value is 65000.
+
+       listen_timeout
+	   Set maximum timeout (in seconds) to establish an initial
+	   connection. Setting listen_timeout > 0 sets rtsp_flags to listen.
+	   Default is -1 which means an infinite timeout when listen mode is
+	   set.
+
+       reorder_queue_size
+	   Set number of packets to buffer for handling of reordered packets.
+
+       timeout
+	   Set socket TCP I/O timeout in microseconds.
+
+       user_agent
+	   Override User-Agent header. If not specified, it defaults to the
+	   libavformat identifier string.
+
+       buffer_size
+	   Set the maximum socket buffer size in bytes.
+
+       When receiving data over UDP, the demuxer tries to reorder received
+       packets (since they may arrive out of order, or packets may get lost
+       totally). This can be disabled by setting the maximum demuxing delay to
+       zero (via the "max_delay" field of AVFormatContext).
+
+       When watching multi-bitrate Real-RTSP streams with ffplay, the streams
+       to display can be chosen with "-vst" n and "-ast" n for video and audio
+       respectively, and can be switched on the fly by pressing "v" and "a".
+
+       Examples
+
+       The following examples all make use of the ffplay and ffmpeg tools.
+
+       o   Watch a stream over UDP, with a max reordering delay of 0.5
+	   seconds:
+
+		   ffplay -max_delay 500000 -rtsp_transport udp rtsp://server/video.mp4
+
+       o   Watch a stream tunneled over HTTP:
+
+		   ffplay -rtsp_transport http rtsp://server/video.mp4
+
+       o   Send a stream in realtime to a RTSP server, for others to watch:
+
+		   ffmpeg -re -i <input> -f rtsp -muxdelay 0.1 rtsp://server/live.sdp
+
+       o   Receive a stream in realtime:
+
+		   ffmpeg -rtsp_flags listen -i rtsp://ownaddress/live.sdp <output>
+
+   sap
+       Session Announcement Protocol (RFC 2974). This is not technically a
+       protocol handler in libavformat, it is a muxer and demuxer.  It is used
+       for signalling of RTP streams, by announcing the SDP for the streams
+       regularly on a separate port.
+
+       Muxer
+
+       The syntax for a SAP url given to the muxer is:
+
+	       sap://<destination>[:<port>][?<options>]
+
+       The RTP packets are sent to destination on port port, or to port 5004
+       if no port is specified.  options is a "&"-separated list. The
+       following options are supported:
+
+       announce_addr=address
+	   Specify the destination IP address for sending the announcements
+	   to.	If omitted, the announcements are sent to the commonly used
+	   SAP announcement multicast address 224.2.127.254 (sap.mcast.net),
+	   or ff0e::2:7ffe if destination is an IPv6 address.
+
+       announce_port=port
+	   Specify the port to send the announcements on, defaults to 9875 if
+	   not specified.
+
+       ttl=ttl
+	   Specify the time to live value for the announcements and RTP
+	   packets, defaults to 255.
+
+       same_port=0|1
+	   If set to 1, send all RTP streams on the same port pair. If zero
+	   (the default), all streams are sent on unique ports, with each
+	   stream on a port 2 numbers higher than the previous.  VLC/Live555
+	   requires this to be set to 1, to be able to receive the stream.
+	   The RTP stack in libavformat for receiving requires all streams to
+	   be sent on unique ports.
+
+       Example command lines follow.
+
+       To broadcast a stream on the local subnet, for watching in VLC:
+
+	       ffmpeg -re -i <input> -f sap sap://224.0.0.255?same_port=1
+
+       Similarly, for watching in ffplay:
+
+	       ffmpeg -re -i <input> -f sap sap://224.0.0.255
+
+       And for watching in ffplay, over IPv6:
+
+	       ffmpeg -re -i <input> -f sap sap://[ff0e::1:2:3:4]
+
+       Demuxer
+
+       The syntax for a SAP url given to the demuxer is:
+
+	       sap://[<address>][:<port>]
+
+       address is the multicast address to listen for announcements on, if
+       omitted, the default 224.2.127.254 (sap.mcast.net) is used. port is the
+       port that is listened on, 9875 if omitted.
+
+       The demuxers listens for announcements on the given address and port.
+       Once an announcement is received, it tries to receive that particular
+       stream.
+
+       Example command lines follow.
+
+       To play back the first stream announced on the normal SAP multicast
+       address:
+
+	       ffplay sap://
+
+       To play back the first stream announced on one the default IPv6 SAP
+       multicast address:
+
+	       ffplay sap://[ff0e::2:7ffe]
+
+   sctp
+       Stream Control Transmission Protocol.
+
+       The accepted URL syntax is:
+
+	       sctp://<host>:<port>[?<options>]
+
+       The protocol accepts the following options:
+
+       listen
+	   If set to any value, listen for an incoming connection. Outgoing
+	   connection is done by default.
+
+       max_streams
+	   Set the maximum number of streams. By default no limit is set.
+
+   srt
+       Haivision Secure Reliable Transport Protocol via libsrt.
+
+       The supported syntax for a SRT URL is:
+
+	       srt://<hostname>:<port>[?<options>]
+
+       options contains a list of &-separated options of the form key=val.
+
+       or
+
+	       <options> srt://<hostname>:<port>
+
+       options contains a list of '-key val' options.
+
+       This protocol accepts the following options.
+
+       connect_timeout=milliseconds
+	   Connection timeout; SRT cannot connect for RTT > 1500 msec (2
+	   handshake exchanges) with the default connect timeout of 3 seconds.
+	   This option applies to the caller and rendezvous connection modes.
+	   The connect timeout is 10 times the value set for the rendezvous
+	   mode (which can be used as a workaround for this connection problem
+	   with earlier versions).
+
+       ffs=bytes
+	   Flight Flag Size (Window Size), in bytes. FFS is actually an
+	   internal parameter and you should set it to not less than
+	   recv_buffer_size and mss. The default value is relatively large,
+	   therefore unless you set a very large receiver buffer, you do not
+	   need to change this option. Default value is 25600.
+
+       inputbw=bytes/seconds
+	   Sender nominal input rate, in bytes per seconds. Used along with
+	   oheadbw, when maxbw is set to relative (0), to calculate maximum
+	   sending rate when recovery packets are sent along with the main
+	   media stream: inputbw * (100 + oheadbw) / 100 if inputbw is not set
+	   while maxbw is set to relative (0), the actual input rate is
+	   evaluated inside the library. Default value is 0.
+
+       iptos=tos
+	   IP Type of Service. Applies to sender only. Default value is 0xB8.
+
+       ipttl=ttl
+	   IP Time To Live. Applies to sender only. Default value is 64.
+
+       latency=microseconds
+	   Timestamp-based Packet Delivery Delay.  Used to absorb bursts of
+	   missed packet retransmissions.  This flag sets both rcvlatency and
+	   peerlatency to the same value. Note that prior to version 1.3.0
+	   this is the only flag to set the latency, however this is
+	   effectively equivalent to setting peerlatency, when side is sender
+	   and rcvlatency when side is receiver, and the bidirectional stream
+	   sending is not supported.
+
+       listen_timeout=microseconds
+	   Set socket listen timeout.
+
+       maxbw=bytes/seconds
+	   Maximum sending bandwidth, in bytes per seconds.  -1 infinite
+	   (CSRTCC limit is 30mbps) 0 relative to input rate (see inputbw) >0
+	   absolute limit value Default value is 0 (relative)
+
+       mode=caller|listener|rendezvous
+	   Connection mode.  caller opens client connection.  listener starts
+	   server to listen for incoming connections.  rendezvous use Rendez-
+	   Vous connection mode.  Default value is caller.
+
+       mss=bytes
+	   Maximum Segment Size, in bytes. Used for buffer allocation and rate
+	   calculation using a packet counter assuming fully filled packets.
+	   The smallest MSS between the peers is used. This is 1500 by default
+	   in the overall internet.  This is the maximum size of the UDP
+	   packet and can be only decreased, unless you have some unusual
+	   dedicated network settings. Default value is 1500.
+
+       nakreport=1|0
+	   If set to 1, Receiver will send `UMSG_LOSSREPORT` messages
+	   periodically until a lost packet is retransmitted or intentionally
+	   dropped. Default value is 1.
+
+       oheadbw=percents
+	   Recovery bandwidth overhead above input rate, in percents.  See
+	   inputbw. Default value is 25%.
+
+       passphrase=string
+	   HaiCrypt Encryption/Decryption Passphrase string, length from 10 to
+	   79 characters. The passphrase is the shared secret between the
+	   sender and the receiver. It is used to generate the Key Encrypting
+	   Key using PBKDF2 (Password-Based Key Derivation Function). It is
+	   used only if pbkeylen is non-zero. It is used on the receiver only
+	   if the received data is encrypted.  The configured passphrase
+	   cannot be recovered (write-only).
+
+       enforced_encryption=1|0
+	   If true, both connection parties must have the same password set
+	   (including empty, that is, with no encryption). If the password
+	   doesn't match or only one side is unencrypted, the connection is
+	   rejected. Default is true.
+
+       kmrefreshrate=packets
+	   The number of packets to be transmitted after which the encryption
+	   key is switched to a new key. Default is -1.  -1 means auto
+	   (0x1000000 in srt library). The range for this option is integers
+	   in the 0 - "INT_MAX".
+
+       kmpreannounce=packets
+	   The interval between when a new encryption key is sent and when
+	   switchover occurs. This value also applies to the subsequent
+	   interval between when switchover occurs and when the old encryption
+	   key is decommissioned. Default is -1.  -1 means auto (0x1000 in srt
+	   library). The range for this option is integers in the 0 -
+	   "INT_MAX".
+
+       snddropdelay=microseconds
+	   The sender's extra delay before dropping packets. This delay is
+	   added to the default drop delay time interval value.
+
+	   Special value -1: Do not drop packets on the sender at all.
+
+       payload_size=bytes
+	   Sets the maximum declared size of a packet transferred during the
+	   single call to the sending function in Live mode. Use 0 if this
+	   value isn't used (which is default in file mode).  Default is -1
+	   (automatic), which typically means MPEG-TS; if you are going to use
+	   SRT to send any different kind of payload, such as, for example,
+	   wrapping a live stream in very small frames, then you can use a
+	   bigger maximum frame size, though not greater than 1456 bytes.
+
+       pkt_size=bytes
+	   Alias for payload_size.
+
+       peerlatency=microseconds
+	   The latency value (as described in rcvlatency) that is set by the
+	   sender side as a minimum value for the receiver.
+
+       pbkeylen=bytes
+	   Sender encryption key length, in bytes.  Only can be set to 0, 16,
+	   24 and 32.  Enable sender encryption if not 0.  Not required on
+	   receiver (set to 0), key size obtained from sender in HaiCrypt
+	   handshake.  Default value is 0.
+
+       rcvlatency=microseconds
+	   The time that should elapse since the moment when the packet was
+	   sent and the moment when it's delivered to the receiver application
+	   in the receiving function.  This time should be a buffer time large
+	   enough to cover the time spent for sending, unexpectedly extended
+	   RTT time, and the time needed to retransmit the lost UDP packet.
+	   The effective latency value will be the maximum of this options'
+	   value and the value of peerlatency set by the peer side. Before
+	   version 1.3.0 this option is only available as latency.
+
+       recv_buffer_size=bytes
+	   Set UDP receive buffer size, expressed in bytes.
+
+       send_buffer_size=bytes
+	   Set UDP send buffer size, expressed in bytes.
+
+       timeout=microseconds
+	   Set raise error timeouts for read, write and connect operations.
+	   Note that the SRT library has internal timeouts which can be
+	   controlled separately, the value set here is only a cap on those.
+
+       tlpktdrop=1|0
+	   Too-late Packet Drop. When enabled on receiver, it skips missing
+	   packets that have not been delivered in time and delivers the
+	   following packets to the application when their time-to-play has
+	   come. It also sends a fake ACK to the sender. When enabled on
+	   sender and enabled on the receiving peer, the sender drops the
+	   older packets that have no chance of being delivered in time. It
+	   was automatically enabled in the sender if the receiver supports
+	   it.
+
+       sndbuf=bytes
+	   Set send buffer size, expressed in bytes.
+
+       rcvbuf=bytes
+	   Set receive buffer size, expressed in bytes.
+
+	   Receive buffer must not be greater than ffs.
+
+       lossmaxttl=packets
+	   The value up to which the Reorder Tolerance may grow. When Reorder
+	   Tolerance is > 0, then packet loss report is delayed until that
+	   number of packets come in. Reorder Tolerance increases every time a
+	   "belated" packet has come, but it wasn't due to retransmission
+	   (that is, when UDP packets tend to come out of order), with the
+	   difference between the latest sequence and this packet's sequence,
+	   and not more than the value of this option. By default it's 0,
+	   which means that this mechanism is turned off, and the loss report
+	   is always sent immediately upon experiencing a "gap" in sequences.
+
+       minversion
+	   The minimum SRT version that is required from the peer. A
+	   connection to a peer that does not satisfy the minimum version
+	   requirement will be rejected.
+
+	   The version format in hex is 0xXXYYZZ for x.y.z in human readable
+	   form.
+
+       streamid=string
+	   A string limited to 512 characters that can be set on the socket
+	   prior to connecting. This stream ID will be able to be retrieved by
+	   the listener side from the socket that is returned from srt_accept
+	   and was connected by a socket with that set stream ID. SRT does not
+	   enforce any special interpretation of the contents of this string.
+	   This option doesnXt make sense in Rendezvous connection; the result
+	   might be that simply one side will override the value from the
+	   other side and itXs the matter of luck which one would win
+
+       srt_streamid=string
+	   Alias for streamid to avoid conflict with ffmpeg command line
+	   option.
+
+       smoother=live|file
+	   The type of Smoother used for the transmission for that socket,
+	   which is responsible for the transmission and congestion control.
+	   The Smoother type must be exactly the same on both connecting
+	   parties, otherwise the connection is rejected.
+
+       messageapi=1|0
+	   When set, this socket uses the Message API, otherwise it uses
+	   Buffer API. Note that in live mode (see transtype) thereXs only
+	   message API available. In File mode you can chose to use one of two
+	   modes:
+
+	   Stream API (default, when this option is false). In this mode you
+	   may send as many data as you wish with one sending instruction, or
+	   even use dedicated functions that read directly from a file. The
+	   internal facility will take care of any speed and congestion
+	   control. When receiving, you can also receive as many data as
+	   desired, the data not extracted will be waiting for the next call.
+	   There is no boundary between data portions in the Stream mode.
+
+	   Message API. In this mode your single sending instruction passes
+	   exactly one piece of data that has boundaries (a message). Contrary
+	   to Live mode, this message may span across multiple UDP packets and
+	   the only size limitation is that it shall fit as a whole in the
+	   sending buffer. The receiver shall use as large buffer as necessary
+	   to receive the message, otherwise the message will not be given up.
+	   When the message is not complete (not all packets received or there
+	   was a packet loss) it will not be given up.
+
+       transtype=live|file
+	   Sets the transmission type for the socket, in particular, setting
+	   this option sets multiple other parameters to their default values
+	   as required for a particular transmission type.
+
+	   live: Set options as for live transmission. In this mode, you
+	   should send by one sending instruction only so many data that fit
+	   in one UDP packet, and limited to the value defined first in
+	   payload_size (1316 is default in this mode). There is no speed
+	   control in this mode, only the bandwidth control, if configured, in
+	   order to not exceed the bandwidth with the overhead transmission
+	   (retransmitted and control packets).
+
+	   file: Set options as for non-live transmission. See messageapi for
+	   further explanations
+
+       linger=seconds
+	   The number of seconds that the socket waits for unsent data when
+	   closing.  Default is -1. -1 means auto (off with 0 seconds in live
+	   mode, on with 180 seconds in file mode). The range for this option
+	   is integers in the 0 - "INT_MAX".
+
+       tsbpd=1|0
+	   When true, use Timestamp-based Packet Delivery mode. The default
+	   behavior depends on the transmission type: enabled in live mode,
+	   disabled in file mode.
+
+       For more information see: <https://github.com/Haivision/srt>.
+
+   srtp
+       Secure Real-time Transport Protocol.
+
+       The accepted options are:
+
+       srtp_in_suite
+       srtp_out_suite
+	   Select input and output encoding suites.
+
+	   Supported values:
+
+	   AES_CM_128_HMAC_SHA1_80
+	   SRTP_AES128_CM_HMAC_SHA1_80
+	   AES_CM_128_HMAC_SHA1_32
+	   SRTP_AES128_CM_HMAC_SHA1_32
+       srtp_in_params
+       srtp_out_params
+	   Set input and output encoding parameters, which are expressed by a
+	   base64-encoded representation of a binary block. The first 16 bytes
+	   of this binary block are used as master key, the following 14 bytes
+	   are used as master salt.
+
+   subfile
+       Virtually extract a segment of a file or another stream.  The
+       underlying stream must be seekable.
+
+       Accepted options:
+
+       start
+	   Start offset of the extracted segment, in bytes.
+
+       end End offset of the extracted segment, in bytes.  If set to 0,
+	   extract till end of file.
+
+       Examples:
+
+       Extract a chapter from a DVD VOB file (start and end sectors obtained
+       externally and multiplied by 2048):
+
+	       subfile,,start,153391104,end,268142592,,:/media/dvd/VIDEO_TS/VTS_08_1.VOB
+
+       Play an AVI file directly from a TAR archive:
+
+	       subfile,,start,183241728,end,366490624,,:archive.tar
+
+       Play a MPEG-TS file from start offset till end:
+
+	       subfile,,start,32815239,end,0,,:video.ts
+
+   tee
+       Writes the output to multiple protocols. The individual outputs are
+       separated by |
+
+	       tee:file://path/to/local/this.avi|file://path/to/local/that.avi
+
+   tcp
+       Transmission Control Protocol.
+
+       The required syntax for a TCP url is:
+
+	       tcp://<hostname>:<port>[?<options>]
+
+       options contains a list of &-separated options of the form key=val.
+
+       The list of supported options follows.
+
+       listen=2|1|0
+	   Listen for an incoming connection. 0 disables listen, 1 enables
+	   listen in single client mode, 2 enables listen in multi-client
+	   mode. Default value is 0.
+
+       local_addr=addr
+	   Local IP address of a network interface used for tcp socket
+	   connect.
+
+       local_port=port
+	   Local port used for tcp socket connect.
+
+       timeout=microseconds
+	   Set raise error timeout, expressed in microseconds.
+
+	   This option is only relevant in read mode: if no data arrived in
+	   more than this time interval, raise error.
+
+       listen_timeout=milliseconds
+	   Set listen timeout, expressed in milliseconds.
+
+       recv_buffer_size=bytes
+	   Set receive buffer size, expressed bytes.
+
+       send_buffer_size=bytes
+	   Set send buffer size, expressed bytes.
+
+       tcp_nodelay=1|0
+	   Set TCP_NODELAY to disable Nagle's algorithm. Default value is 0.
+
+	   Remark: Writing to the socket is currently not optimized to
+	   minimize system calls and reduces the efficiency / effect of
+	   TCP_NODELAY.
+
+       tcp_mss=bytes
+	   Set maximum segment size for outgoing TCP packets, expressed in
+	   bytes.
+
+       The following example shows how to setup a listening TCP connection
+       with ffmpeg, which is then accessed with ffplay:
+
+	       ffmpeg -i <input> -f <format> tcp://<hostname>:<port>?listen
+	       ffplay tcp://<hostname>:<port>
+
+   tls
+       Transport Layer Security (TLS) / Secure Sockets Layer (SSL)
+
+       The required syntax for a TLS/SSL url is:
+
+	       tls://<hostname>:<port>[?<options>]
+
+       The following parameters can be set via command line options (or in
+       code via "AVOption"s):
+
+       ca_file, cafile=filename
+	   A file containing certificate authority (CA) root certificates to
+	   treat as trusted. If the linked TLS library contains a default this
+	   might not need to be specified for verification to work, but not
+	   all libraries and setups have defaults built in.  The file must be
+	   in OpenSSL PEM format.
+
+       tls_verify=1|0
+	   If enabled, try to verify the peer that we are communicating with.
+	   Note, if using OpenSSL, this currently only makes sure that the
+	   peer certificate is signed by one of the root certificates in the
+	   CA database, but it does not validate that the certificate actually
+	   matches the host name we are trying to connect to. (With other
+	   backends, the host name is validated as well.)
+
+	   This is disabled by default since it requires a CA database to be
+	   provided by the caller in many cases.
+
+       cert_file, cert=filename
+	   A file containing a certificate to use in the handshake with the
+	   peer.  (When operating as server, in listen mode, this is more
+	   often required by the peer, while client certificates only are
+	   mandated in certain setups.)
+
+       key_file, key=filename
+	   A file containing the private key for the certificate.
+
+       listen=1|0
+	   If enabled, listen for connections on the provided port, and assume
+	   the server role in the handshake instead of the client role.
+
+       http_proxy
+	   The HTTP proxy to tunnel through, e.g. "http://example.com:1234".
+	   The proxy must support the CONNECT method.
+
+       Example command lines:
+
+       To create a TLS/SSL server that serves an input stream.
+
+	       ffmpeg -i <input> -f <format> tls://<hostname>:<port>?listen&cert=<server.crt>&key=<server.key>
+
+       To play back a stream from the TLS/SSL server using ffplay:
+
+	       ffplay tls://<hostname>:<port>
+
+   udp
+       User Datagram Protocol.
+
+       The required syntax for an UDP URL is:
+
+	       udp://<hostname>:<port>[?<options>]
+
+       options contains a list of &-separated options of the form key=val.
+
+       In case threading is enabled on the system, a circular buffer is used
+       to store the incoming data, which allows one to reduce loss of data due
+       to UDP socket buffer overruns. The fifo_size and overrun_nonfatal
+       options are related to this buffer.
+
+       The list of supported options follows.
+
+       buffer_size=size
+	   Set the UDP maximum socket buffer size in bytes. This is used to
+	   set either the receive or send buffer size, depending on what the
+	   socket is used for.	Default is 32 KB for output, 384 KB for input.
+	   See also fifo_size.
+
+       bitrate=bitrate
+	   If set to nonzero, the output will have the specified constant
+	   bitrate if the input has enough packets to sustain it.
+
+       burst_bits=bits
+	   When using bitrate this specifies the maximum number of bits in
+	   packet bursts.
+
+       localport=port
+	   Override the local UDP port to bind with.
+
+       localaddr=addr
+	   Local IP address of a network interface used for sending packets or
+	   joining multicast groups.
+
+       pkt_size=size
+	   Set the size in bytes of UDP packets.
+
+       reuse=1|0
+	   Explicitly allow or disallow reusing UDP sockets.
+
+       ttl=ttl
+	   Set the time to live value (for multicast only).
+
+       connect=1|0
+	   Initialize the UDP socket with "connect()". In this case, the
+	   destination address can't be changed with ff_udp_set_remote_url
+	   later.  If the destination address isn't known at the start, this
+	   option can be specified in ff_udp_set_remote_url, too.  This allows
+	   finding out the source address for the packets with getsockname,
+	   and makes writes return with AVERROR(ECONNREFUSED) if "destination
+	   unreachable" is received.  For receiving, this gives the benefit of
+	   only receiving packets from the specified peer address/port.
+
+       sources=address[,address]
+	   Only receive packets sent from the specified addresses. In case of
+	   multicast, also subscribe to multicast traffic coming from these
+	   addresses only.
+
+       block=address[,address]
+	   Ignore packets sent from the specified addresses. In case of
+	   multicast, also exclude the source addresses in the multicast
+	   subscription.
+
+       fifo_size=units
+	   Set the UDP receiving circular buffer size, expressed as a number
+	   of packets with size of 188 bytes. If not specified defaults to
+	   7*4096.
+
+       overrun_nonfatal=1|0
+	   Survive in case of UDP receiving circular buffer overrun. Default
+	   value is 0.
+
+       timeout=microseconds
+	   Set raise error timeout, expressed in microseconds.
+
+	   This option is only relevant in read mode: if no data arrived in
+	   more than this time interval, raise error.
+
+       broadcast=1|0
+	   Explicitly allow or disallow UDP broadcasting.
+
+	   Note that broadcasting may not work properly on networks having a
+	   broadcast storm protection.
+
+       Examples
+
+       o   Use ffmpeg to stream over UDP to a remote endpoint:
+
+		   ffmpeg -i <input> -f <format> udp://<hostname>:<port>
+
+       o   Use ffmpeg to stream in mpegts format over UDP using 188 sized UDP
+	   packets, using a large input buffer:
+
+		   ffmpeg -i <input> -f mpegts udp://<hostname>:<port>?pkt_size=188&buffer_size=65535
+
+       o   Use ffmpeg to receive over UDP from a remote endpoint:
+
+		   ffmpeg -i udp://[<multicast-address>]:<port> ...
+
+   unix
+       Unix local socket
+
+       The required syntax for a Unix socket URL is:
+
+	       unix://<filepath>
+
+       The following parameters can be set via command line options (or in
+       code via "AVOption"s):
+
+       timeout
+	   Timeout in ms.
+
+       listen
+	   Create the Unix socket in listening mode.
+
+   zmq
+       ZeroMQ asynchronous messaging using the libzmq library.
+
+       This library supports unicast streaming to multiple clients without
+       relying on an external server.
+
+       The required syntax for streaming or connecting to a stream is:
+
+	       zmq:tcp://ip-address:port
+
+       Example: Create a localhost stream on port 5555:
+
+	       ffmpeg -re -i input -f mpegts zmq:tcp://127.0.0.1:5555
+
+       Multiple clients may connect to the stream using:
+
+	       ffplay zmq:tcp://127.0.0.1:5555
+
+       Streaming to multiple clients is implemented using a ZeroMQ Pub-Sub
+       pattern.  The server side binds to a port and publishes data. Clients
+       connect to the server (via IP address/port) and subscribe to the
+       stream. The order in which the server and client start generally does
+       not matter.
+
+       ffmpeg must be compiled with the --enable-libzmq option to support this
+       protocol.
+
+       Options can be set on the ffmpeg/ffplay command line. The following
+       options are supported:
+
+       pkt_size
+	   Forces the maximum packet size for sending/receiving data. The
+	   default value is 131,072 bytes. On the server side, this sets the
+	   maximum size of sent packets via ZeroMQ. On the clients, it sets an
+	   internal buffer size for receiving packets. Note that pkt_size on
+	   the clients should be equal to or greater than pkt_size on the
+	   server. Otherwise the received message may be truncated causing
+	   decoding errors.
+
+DEVICE OPTIONS
+       The libavdevice library provides the same interface as libavformat.
+       Namely, an input device is considered like a demuxer, and an output
+       device like a muxer, and the interface and generic device options are
+       the same provided by libavformat (see the ffmpeg-formats manual).
+
+       In addition each input or output device may support so-called private
+       options, which are specific for that component.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the device "AVFormatContext" options
+       or using the libavutil/opt.h API for programmatic use.
+
+INPUT DEVICES
+       Input devices are configured elements in FFmpeg which enable accessing
+       the data coming from a multimedia device attached to your system.
+
+       When you configure your FFmpeg build, all the supported input devices
+       are enabled by default. You can list all available ones using the
+       configure option "--list-indevs".
+
+       You can disable all the input devices using the configure option
+       "--disable-indevs", and selectively enable an input device using the
+       option "--enable-indev=INDEV", or you can disable a particular input
+       device using the option "--disable-indev=INDEV".
+
+       The option "-devices" of the ff* tools will display the list of
+       supported input devices.
+
+       A description of the currently available input devices follows.
+
+   alsa
+       ALSA (Advanced Linux Sound Architecture) input device.
+
+       To enable this input device during configuration you need libasound
+       installed on your system.
+
+       This device allows capturing from an ALSA device. The name of the
+       device to capture has to be an ALSA card identifier.
+
+       An ALSA identifier has the syntax:
+
+	       hw:<CARD>[,<DEV>[,<SUBDEV>]]
+
+       where the DEV and SUBDEV components are optional.
+
+       The three arguments (in order: CARD,DEV,SUBDEV) specify card number or
+       identifier, device number and subdevice number (-1 means any).
+
+       To see the list of cards currently recognized by your system check the
+       files /proc/asound/cards and /proc/asound/devices.
+
+       For example to capture with ffmpeg from an ALSA device with card id 0,
+       you may run the command:
+
+	       ffmpeg -f alsa -i hw:0 alsaout.wav
+
+       For more information see:
+       <http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html>
+
+       Options
+
+       sample_rate
+	   Set the sample rate in Hz. Default is 48000.
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   android_camera
+       Android camera input device.
+
+       This input devices uses the Android Camera2 NDK API which is available
+       on devices with API level 24+. The availability of android_camera is
+       autodetected during configuration.
+
+       This device allows capturing from all cameras on an Android device,
+       which are integrated into the Camera2 NDK API.
+
+       The available cameras are enumerated internally and can be selected
+       with the camera_index parameter. The input file string is discarded.
+
+       Generally the back facing camera has index 0 while the front facing
+       camera has index 1.
+
+       Options
+
+       video_size
+	   Set the video size given as a string such as 640x480 or hd720.
+	   Falls back to the first available configuration reported by Android
+	   if requested video size is not available or by default.
+
+       framerate
+	   Set the video framerate.  Falls back to the first available
+	   configuration reported by Android if requested framerate is not
+	   available or by default (-1).
+
+       camera_index
+	   Set the index of the camera to use. Default is 0.
+
+       input_queue_size
+	   Set the maximum number of frames to buffer. Default is 5.
+
+   avfoundation
+       AVFoundation input device.
+
+       AVFoundation is the currently recommended framework by Apple for
+       streamgrabbing on OSX >= 10.7 as well as on iOS.
+
+       The input filename has to be given in the following syntax:
+
+	       -i "[[VIDEO]:[AUDIO]]"
+
+       The first entry selects the video input while the latter selects the
+       audio input.  The stream has to be specified by the device name or the
+       device index as shown by the device list.  Alternatively, the video
+       and/or audio input device can be chosen by index using the
+
+	   B<-video_device_index E<lt>INDEXE<gt>>
+
+       and/or
+
+	   B<-audio_device_index E<lt>INDEXE<gt>>
+
+       , overriding any device name or index given in the input filename.
+
+       All available devices can be enumerated by using -list_devices true,
+       listing all device names and corresponding indices.
+
+       There are two device name aliases:
+
+       "default"
+	   Select the AVFoundation default device of the corresponding type.
+
+       "none"
+	   Do not record the corresponding media type.	This is equivalent to
+	   specifying an empty device name or index.
+
+       Options
+
+       AVFoundation supports the following options:
+
+       -list_devices <TRUE|FALSE>
+	   If set to true, a list of all available input devices is given
+	   showing all device names and indices.
+
+       -video_device_index <INDEX>
+	   Specify the video device by its index. Overrides anything given in
+	   the input filename.
+
+       -audio_device_index <INDEX>
+	   Specify the audio device by its index. Overrides anything given in
+	   the input filename.
+
+       -pixel_format <FORMAT>
+	   Request the video device to use a specific pixel format.  If the
+	   specified format is not supported, a list of available formats is
+	   given and the first one in this list is used instead. Available
+	   pixel formats are: "monob, rgb555be, rgb555le, rgb565be, rgb565le,
+	   rgb24, bgr24, 0rgb, bgr0, 0bgr, rgb0,
+	    bgr48be, uyvy422, yuva444p, yuva444p16le, yuv444p, yuv422p16,
+	   yuv422p10, yuv444p10,
+	    yuv420p, nv12, yuyv422, gray"
+
+       -framerate
+	   Set the grabbing frame rate. Default is "ntsc", corresponding to a
+	   frame rate of "30000/1001".
+
+       -video_size
+	   Set the video frame size.
+
+       -capture_cursor
+	   Capture the mouse pointer. Default is 0.
+
+       -capture_mouse_clicks
+	   Capture the screen mouse clicks. Default is 0.
+
+       -capture_raw_data
+	   Capture the raw device data. Default is 0.  Using this option may
+	   result in receiving the underlying data delivered to the
+	   AVFoundation framework. E.g. for muxed devices that sends raw DV
+	   data to the framework (like tape-based camcorders), setting this
+	   option to false results in extracted video frames captured in the
+	   designated pixel format only. Setting this option to true results
+	   in receiving the raw DV stream untouched.
+
+       Examples
+
+       o   Print the list of AVFoundation supported devices and exit:
+
+		   $ ffmpeg -f avfoundation -list_devices true -i ""
+
+       o   Record video from video device 0 and audio from audio device 0 into
+	   out.avi:
+
+		   $ ffmpeg -f avfoundation -i "0:0" out.avi
+
+       o   Record video from video device 2 and audio from audio device 1 into
+	   out.avi:
+
+		   $ ffmpeg -f avfoundation -video_device_index 2 -i ":1" out.avi
+
+       o   Record video from the system default video device using the pixel
+	   format bgr0 and do not record any audio into out.avi:
+
+		   $ ffmpeg -f avfoundation -pixel_format bgr0 -i "default:none" out.avi
+
+       o   Record raw DV data from a suitable input device and write the
+	   output into out.dv:
+
+		   $ ffmpeg -f avfoundation -capture_raw_data true -i "zr100:none" out.dv
+
+   bktr
+       BSD video input device. Deprecated and will be removed - please contact
+       the developers if you are interested in maintaining it.
+
+       Options
+
+       framerate
+	   Set the frame rate.
+
+       video_size
+	   Set the video frame size. Default is "vga".
+
+       standard
+	   Available values are:
+
+	   pal
+	   ntsc
+	   secam
+	   paln
+	   palm
+	   ntscj
+
+   decklink
+       The decklink input device provides capture capabilities for Blackmagic
+       DeckLink devices.
+
+       To enable this input device, you need the Blackmagic DeckLink SDK and
+       you need to configure with the appropriate "--extra-cflags" and
+       "--extra-ldflags".  On Windows, you need to run the IDL files through
+       widl.
+
+       DeckLink is very picky about the formats it supports. Pixel format of
+       the input can be set with raw_format.  Framerate and video size must be
+       determined for your device with -list_formats 1. Audio sample rate is
+       always 48 kHz and the number of channels can be 2, 8 or 16. Note that
+       all audio channels are bundled in one single audio track.
+
+       Options
+
+       list_devices
+	   If set to true, print a list of devices and exit.  Defaults to
+	   false. This option is deprecated, please use the "-sources" option
+	   of ffmpeg to list the available input devices.
+
+       list_formats
+	   If set to true, print a list of supported formats and exit.
+	   Defaults to false.
+
+       format_code <FourCC>
+	   This sets the input video format to the format given by the FourCC.
+	   To see the supported values of your device(s) use list_formats.
+	   Note that there is a FourCC 'pal ' that can also be used as pal (3
+	   letters).  Default behavior is autodetection of the input video
+	   format, if the hardware supports it.
+
+       raw_format
+	   Set the pixel format of the captured video.	Available values are:
+
+	   auto
+	       This is the default which means 8-bit YUV 422 or 8-bit ARGB if
+	       format autodetection is used, 8-bit YUV 422 otherwise.
+
+	   uyvy422
+	       8-bit YUV 422.
+
+	   yuv422p10
+	       10-bit YUV 422.
+
+	   argb
+	       8-bit RGB.
+
+	   bgra
+	       8-bit RGB.
+
+	   rgb10
+	       10-bit RGB.
+
+       teletext_lines
+	   If set to nonzero, an additional teletext stream will be captured
+	   from the vertical ancillary data. Both SD PAL (576i) and HD (1080i
+	   or 1080p) sources are supported. In case of HD sources, OP47
+	   packets are decoded.
+
+	   This option is a bitmask of the SD PAL VBI lines captured,
+	   specifically lines 6 to 22, and lines 318 to 335. Line 6 is the LSB
+	   in the mask. Selected lines which do not contain teletext
+	   information will be ignored. You can use the special all constant
+	   to select all possible lines, or standard to skip lines 6, 318 and
+	   319, which are not compatible with all receivers.
+
+	   For SD sources, ffmpeg needs to be compiled with
+	   "--enable-libzvbi". For HD sources, on older (pre-4K) DeckLink card
+	   models you have to capture in 10 bit mode.
+
+       channels
+	   Defines number of audio channels to capture. Must be 2, 8 or 16.
+	   Defaults to 2.
+
+       duplex_mode
+	   Sets the decklink device duplex/profile mode. Must be unset, half,
+	   full, one_sub_device_full, one_sub_device_half,
+	   two_sub_device_full, four_sub_device_half Defaults to unset.
+
+	   Note: DeckLink SDK 11.0 have replaced the duplex property by a
+	   profile property.  For the DeckLink Duo 2 and DeckLink Quad 2, a
+	   profile is shared between any 2 sub-devices that utilize the same
+	   connectors. For the DeckLink 8K Pro, a profile is shared between
+	   all 4 sub-devices. So DeckLink 8K Pro support four profiles.
+
+	   Valid profile modes for DeckLink 8K Pro(with DeckLink SDK >= 11.0):
+	   one_sub_device_full, one_sub_device_half, two_sub_device_full,
+	   four_sub_device_half
+
+	   Valid profile modes for DeckLink Quad 2 and DeckLink Duo 2: half,
+	   full
+
+       timecode_format
+	   Timecode type to include in the frame and video stream metadata.
+	   Must be none, rp188vitc, rp188vitc2, rp188ltc, rp188hfr, rp188any,
+	   vitc, vitc2, or serial.  Defaults to none (not included).
+
+	   In order to properly support 50/60 fps timecodes, the ordering of
+	   the queried timecode types for rp188any is HFR, VITC1, VITC2 and
+	   LTC for >30 fps content. Note that this is slightly different to
+	   the ordering used by the DeckLink API, which is HFR, VITC1, LTC,
+	   VITC2.
+
+       video_input
+	   Sets the video input source. Must be unset, sdi, hdmi, optical_sdi,
+	   component, composite or s_video.  Defaults to unset.
+
+       audio_input
+	   Sets the audio input source. Must be unset, embedded, aes_ebu,
+	   analog, analog_xlr, analog_rca or microphone. Defaults to unset.
+
+       video_pts
+	   Sets the video packet timestamp source. Must be video, audio,
+	   reference, wallclock or abs_wallclock.  Defaults to video.
+
+       audio_pts
+	   Sets the audio packet timestamp source. Must be video, audio,
+	   reference, wallclock or abs_wallclock.  Defaults to audio.
+
+       draw_bars
+	   If set to true, color bars are drawn in the event of a signal loss.
+	   Defaults to true.
+
+       queue_size
+	   Sets maximum input buffer size in bytes. If the buffering reaches
+	   this value, incoming frames will be dropped.  Defaults to
+	   1073741824.
+
+       audio_depth
+	   Sets the audio sample bit depth. Must be 16 or 32.  Defaults to 16.
+
+       decklink_copyts
+	   If set to true, timestamps are forwarded as they are without
+	   removing the initial offset.  Defaults to false.
+
+       timestamp_align
+	   Capture start time alignment in seconds. If set to nonzero, input
+	   frames are dropped till the system timestamp aligns with configured
+	   value.  Alignment difference of up to one frame duration is
+	   tolerated.  This is useful for maintaining input synchronization
+	   across N different hardware devices deployed for 'N-way'
+	   redundancy. The system time of different hardware devices should be
+	   synchronized with protocols such as NTP or PTP, before using this
+	   option.  Note that this method is not foolproof. In some border
+	   cases input synchronization may not happen due to thread scheduling
+	   jitters in the OS.  Either sync could go wrong by 1 frame or in a
+	   rarer case timestamp_align seconds.	Defaults to 0.
+
+       wait_for_tc (bool)
+	   Drop frames till a frame with timecode is received. Sometimes
+	   serial timecode isn't received with the first input frame. If that
+	   happens, the stored stream timecode will be inaccurate. If this
+	   option is set to true, input frames are dropped till a frame with
+	   timecode is received.  Option timecode_format must be specified.
+	   Defaults to false.
+
+       enable_klv(bool)
+	   If set to true, extracts KLV data from VANC and outputs KLV
+	   packets.  KLV VANC packets are joined based on MID and PSC fields
+	   and aggregated into one KLV packet.	Defaults to false.
+
+       Examples
+
+       o   List input devices:
+
+		   ffmpeg -sources decklink
+
+       o   List supported formats:
+
+		   ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'
+
+       o   Capture video clip at 1080i50:
+
+		   ffmpeg -format_code Hi50 -f decklink -i 'Intensity Pro' -c:a copy -c:v copy output.avi
+
+       o   Capture video clip at 1080i50 10 bit:
+
+		   ffmpeg -raw_format yuv422p10 -format_code Hi50 -f decklink -i 'UltraStudio Mini Recorder' -c:a copy -c:v copy output.avi
+
+       o   Capture video clip at 1080i50 with 16 audio channels:
+
+		   ffmpeg -channels 16 -format_code Hi50 -f decklink -i 'UltraStudio Mini Recorder' -c:a copy -c:v copy output.avi
+
+   dshow
+       Windows DirectShow input device.
+
+       DirectShow support is enabled when FFmpeg is built with the mingw-w64
+       project.  Currently only audio and video devices are supported.
+
+       Multiple devices may be opened as separate inputs, but they may also be
+       opened on the same input, which should improve synchronism between
+       them.
+
+       The input name should be in the format:
+
+	       <TYPE>=<NAME>[:<TYPE>=<NAME>]
+
+       where TYPE can be either audio or video, and NAME is the device's name
+       or alternative name..
+
+       Options
+
+       If no options are specified, the device's defaults are used.  If the
+       device does not support the requested options, it will fail to open.
+
+       video_size
+	   Set the video size in the captured video.
+
+       framerate
+	   Set the frame rate in the captured video.
+
+       sample_rate
+	   Set the sample rate (in Hz) of the captured audio.
+
+       sample_size
+	   Set the sample size (in bits) of the captured audio.
+
+       channels
+	   Set the number of channels in the captured audio.
+
+       list_devices
+	   If set to true, print a list of devices and exit.
+
+       list_options
+	   If set to true, print a list of selected device's options and exit.
+
+       video_device_number
+	   Set video device number for devices with the same name (starts at
+	   0, defaults to 0).
+
+       audio_device_number
+	   Set audio device number for devices with the same name (starts at
+	   0, defaults to 0).
+
+       pixel_format
+	   Select pixel format to be used by DirectShow. This may only be set
+	   when the video codec is not set or set to rawvideo.
+
+       audio_buffer_size
+	   Set audio device buffer size in milliseconds (which can directly
+	   impact latency, depending on the device).  Defaults to using the
+	   audio device's default buffer size (typically some multiple of
+	   500ms).  Setting this value too low can degrade performance.  See
+	   also
+	   <http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx>
+
+       video_pin_name
+	   Select video capture pin to use by name or alternative name.
+
+       audio_pin_name
+	   Select audio capture pin to use by name or alternative name.
+
+       crossbar_video_input_pin_number
+	   Select video input pin number for crossbar device. This will be
+	   routed to the crossbar device's Video Decoder output pin.  Note
+	   that changing this value can affect future invocations (sets a new
+	   default) until system reboot occurs.
+
+       crossbar_audio_input_pin_number
+	   Select audio input pin number for crossbar device. This will be
+	   routed to the crossbar device's Audio Decoder output pin.  Note
+	   that changing this value can affect future invocations (sets a new
+	   default) until system reboot occurs.
+
+       show_video_device_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to change video filter properties and
+	   configurations manually.  Note that for crossbar devices, adjusting
+	   values in this dialog may be needed at times to toggle between PAL
+	   (25 fps) and NTSC (29.97) input frame rates, sizes, interlacing,
+	   etc.  Changing these values can enable different scan rates/frame
+	   rates and avoiding green bars at the bottom, flickering scan lines,
+	   etc.  Note that with some devices, changing these properties can
+	   also affect future invocations (sets new defaults) until system
+	   reboot occurs.
+
+       show_audio_device_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to change audio filter properties and
+	   configurations manually.
+
+       show_video_crossbar_connection_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify crossbar pin
+	   routings, when it opens a video device.
+
+       show_audio_crossbar_connection_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify crossbar pin
+	   routings, when it opens an audio device.
+
+       show_analog_tv_tuner_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify TV channels and
+	   frequencies.
+
+       show_analog_tv_tuner_audio_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify TV audio (like mono
+	   vs. stereo, Language A,B or C).
+
+       audio_device_load
+	   Load an audio capture filter device from file instead of searching
+	   it by name. It may load additional parameters too, if the filter
+	   supports the serialization of its properties to.  To use this an
+	   audio capture source has to be specified, but it can be anything
+	   even fake one.
+
+       audio_device_save
+	   Save the currently used audio capture filter device and its
+	   parameters (if the filter supports it) to a file.  If a file with
+	   the same name exists it will be overwritten.
+
+       video_device_load
+	   Load a video capture filter device from file instead of searching
+	   it by name. It may load additional parameters too, if the filter
+	   supports the serialization of its properties to.  To use this a
+	   video capture source has to be specified, but it can be anything
+	   even fake one.
+
+       video_device_save
+	   Save the currently used video capture filter device and its
+	   parameters (if the filter supports it) to a file.  If a file with
+	   the same name exists it will be overwritten.
+
+       use_video_device_timestamps
+	   If set to false, the timestamp for video frames will be derived
+	   from the wallclock instead of the timestamp provided by the capture
+	   device. This allows working around devices that provide unreliable
+	   timestamps.
+
+       Examples
+
+       o   Print the list of DirectShow supported devices and exit:
+
+		   $ ffmpeg -list_devices true -f dshow -i dummy
+
+       o   Open video device Camera:
+
+		   $ ffmpeg -f dshow -i video="Camera"
+
+       o   Open second video device with name Camera:
+
+		   $ ffmpeg -f dshow -video_device_number 1 -i video="Camera"
+
+       o   Open video device Camera and audio device Microphone:
+
+		   $ ffmpeg -f dshow -i video="Camera":audio="Microphone"
+
+       o   Print the list of supported options in selected device and exit:
+
+		   $ ffmpeg -list_options true -f dshow -i video="Camera"
+
+       o   Specify pin names to capture by name or alternative name, specify
+	   alternative device name:
+
+		   $ ffmpeg -f dshow -audio_pin_name "Audio Out" -video_pin_name 2 -i video=video="@device_pnp_\\?\pci#ven_1a0a&dev_6200&subsys_62021461&rev_01#4&e2c7dd6&0&00e1#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}":audio="Microphone"
+
+       o   Configure a crossbar device, specifying crossbar pins, allow user
+	   to adjust video capture properties at startup:
+
+		   $ ffmpeg -f dshow -show_video_device_dialog true -crossbar_video_input_pin_number 0
+			-crossbar_audio_input_pin_number 3 -i video="AVerMedia BDA Analog Capture":audio="AVerMedia BDA Analog Capture"
+
+   fbdev
+       Linux framebuffer input device.
+
+       The Linux framebuffer is a graphic hardware-independent abstraction
+       layer to show graphics on a computer monitor, typically on the console.
+       It is accessed through a file device node, usually /dev/fb0.
+
+       For more detailed information read the file
+       Documentation/fb/framebuffer.txt included in the Linux source tree.
+
+       See also <http://linux-fbdev.sourceforge.net/>, and fbset(1).
+
+       To record from the framebuffer device /dev/fb0 with ffmpeg:
+
+	       ffmpeg -f fbdev -framerate 10 -i /dev/fb0 out.avi
+
+       You can take a single screenshot image with the command:
+
+	       ffmpeg -f fbdev -framerate 1 -i /dev/fb0 -frames:v 1 screenshot.jpeg
+
+       Options
+
+       framerate
+	   Set the frame rate. Default is 25.
+
+   gdigrab
+       Win32 GDI-based screen capture device.
+
+       This device allows you to capture a region of the display on Windows.
+
+       Amongst options for the imput filenames are such elements as:
+
+	       desktop
+
+       or
+
+	       title=<window_title>
+
+       or
+
+	       hwnd=<window_hwnd>
+
+       The first option will capture the entire desktop, or a fixed region of
+       the desktop. The second and third options will instead capture the
+       contents of a single window, regardless of its position on the screen.
+
+       For example, to grab the entire desktop using ffmpeg:
+
+	       ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg
+
+       Grab a 640x480 region at position "10,20":
+
+	       ffmpeg -f gdigrab -framerate 6 -offset_x 10 -offset_y 20 -video_size vga -i desktop out.mpg
+
+       Grab the contents of the window named "Calculator"
+
+	       ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg
+
+       Options
+
+       draw_mouse
+	   Specify whether to draw the mouse pointer. Use the value 0 to not
+	   draw the pointer. Default value is 1.
+
+       framerate
+	   Set the grabbing frame rate. Default value is "ntsc", corresponding
+	   to a frame rate of "30000/1001".
+
+       show_region
+	   Show grabbed region on screen.
+
+	   If show_region is specified with 1, then the grabbing region will
+	   be indicated on screen. With this option, it is easy to know what
+	   is being grabbed if only a portion of the screen is grabbed.
+
+	   Note that show_region is incompatible with grabbing the contents of
+	   a single window.
+
+	   For example:
+
+		   ffmpeg -f gdigrab -show_region 1 -framerate 6 -video_size cif -offset_x 10 -offset_y 20 -i desktop out.mpg
+
+       video_size
+	   Set the video frame size. The default is to capture the full screen
+	   if desktop is selected, or the full window size if
+	   title=window_title is selected.
+
+       offset_x
+	   When capturing a region with video_size, set the distance from the
+	   left edge of the screen or desktop.
+
+	   Note that the offset calculation is from the top left corner of the
+	   primary monitor on Windows. If you have a monitor positioned to the
+	   left of your primary monitor, you will need to use a negative
+	   offset_x value to move the region to that monitor.
+
+       offset_y
+	   When capturing a region with video_size, set the distance from the
+	   top edge of the screen or desktop.
+
+	   Note that the offset calculation is from the top left corner of the
+	   primary monitor on Windows. If you have a monitor positioned above
+	   your primary monitor, you will need to use a negative offset_y
+	   value to move the region to that monitor.
+
+   iec61883
+       FireWire DV/HDV input device using libiec61883.
+
+       To enable this input device, you need libiec61883, libraw1394 and
+       libavc1394 installed on your system. Use the configure option
+       "--enable-libiec61883" to compile with the device enabled.
+
+       The iec61883 capture device supports capturing from a video device
+       connected via IEEE1394 (FireWire), using libiec61883 and the new Linux
+       FireWire stack (juju). This is the default DV/HDV input method in Linux
+       Kernel 2.6.37 and later, since the old FireWire stack was removed.
+
+       Specify the FireWire port to be used as input file, or "auto" to choose
+       the first port connected.
+
+       Options
+
+       dvtype
+	   Override autodetection of DV/HDV. This should only be used if auto
+	   detection does not work, or if usage of a different device type
+	   should be prohibited. Treating a DV device as HDV (or vice versa)
+	   will not work and result in undefined behavior.  The values auto,
+	   dv and hdv are supported.
+
+       dvbuffer
+	   Set maximum size of buffer for incoming data, in frames. For DV,
+	   this is an exact value. For HDV, it is not frame exact, since HDV
+	   does not have a fixed frame size.
+
+       dvguid
+	   Select the capture device by specifying its GUID. Capturing will
+	   only be performed from the specified device and fails if no device
+	   with the given GUID is found. This is useful to select the input if
+	   multiple devices are connected at the same time.  Look at
+	   /sys/bus/firewire/devices to find out the GUIDs.
+
+       Examples
+
+       o   Grab and show the input of a FireWire DV/HDV device.
+
+		   ffplay -f iec61883 -i auto
+
+       o   Grab and record the input of a FireWire DV/HDV device, using a
+	   packet buffer of 100000 packets if the source is HDV.
+
+		   ffmpeg -f iec61883 -i auto -dvbuffer 100000 out.mpg
+
+   jack
+       JACK input device.
+
+       To enable this input device during configuration you need libjack
+       installed on your system.
+
+       A JACK input device creates one or more JACK writable clients, one for
+       each audio channel, with name client_name:input_N, where client_name is
+       the name provided by the application, and N is a number which
+       identifies the channel.	Each writable client will send the acquired
+       data to the FFmpeg input device.
+
+       Once you have created one or more JACK readable clients, you need to
+       connect them to one or more JACK writable clients.
+
+       To connect or disconnect JACK clients you can use the jack_connect and
+       jack_disconnect programs, or do it through a graphical interface, for
+       example with qjackctl.
+
+       To list the JACK clients and their properties you can invoke the
+       command jack_lsp.
+
+       Follows an example which shows how to capture a JACK readable client
+       with ffmpeg.
+
+	       # Create a JACK writable client with name "ffmpeg".
+	       $ ffmpeg -f jack -i ffmpeg -y out.wav
+
+	       # Start the sample jack_metro readable client.
+	       $ jack_metro -b 120 -d 0.2 -f 4000
+
+	       # List the current JACK clients.
+	       $ jack_lsp -c
+	       system:capture_1
+	       system:capture_2
+	       system:playback_1
+	       system:playback_2
+	       ffmpeg:input_1
+	       metro:120_bpm
+
+	       # Connect metro to the ffmpeg writable client.
+	       $ jack_connect metro:120_bpm ffmpeg:input_1
+
+       For more information read: <http://jackaudio.org/>
+
+       Options
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   kmsgrab
+       KMS video input device.
+
+       Captures the KMS scanout framebuffer associated with a specified CRTC
+       or plane as a DRM object that can be passed to other hardware
+       functions.
+
+       Requires either DRM master or CAP_SYS_ADMIN to run.
+
+       If you don't understand what all of that means, you probably don't want
+       this.  Look at x11grab instead.
+
+       Options
+
+       device
+	   DRM device to capture on.  Defaults to /dev/dri/card0.
+
+       format
+	   Pixel format of the framebuffer.  This can be autodetected if you
+	   are running Linux 5.7 or later, but needs to be provided for
+	   earlier versions.  Defaults to bgr0, which is the most common
+	   format used by the Linux console and Xorg X server.
+
+       format_modifier
+	   Format modifier to signal on output frames.	This is necessary to
+	   import correctly into some APIs.  It can be autodetected if you are
+	   running Linux 5.7 or later, but will need to be provided explicitly
+	   when needed in earlier versions.  See the libdrm documentation for
+	   possible values.
+
+       crtc_id
+	   KMS CRTC ID to define the capture source.  The first active plane
+	   on the given CRTC will be used.
+
+       plane_id
+	   KMS plane ID to define the capture source.  Defaults to the first
+	   active plane found if neither crtc_id nor plane_id are specified.
+
+       framerate
+	   Framerate to capture at.  This is not synchronised to any page
+	   flipping or framebuffer changes - it just defines the interval at
+	   which the framebuffer is sampled.  Sampling faster than the
+	   framebuffer update rate will generate independent frames with the
+	   same content.  Defaults to 30.
+
+       Examples
+
+       o   Capture from the first active plane, download the result to normal
+	   frames and encode.  This will only work if the framebuffer is both
+	   linear and mappable - if not, the result may be scrambled or fail
+	   to download.
+
+		   ffmpeg -f kmsgrab -i - -vf 'hwdownload,format=bgr0' output.mp4
+
+       o   Capture from CRTC ID 42 at 60fps, map the result to VAAPI, convert
+	   to NV12 and encode as H.264.
+
+		   ffmpeg -crtc_id 42 -framerate 60 -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' -c:v h264_vaapi output.mp4
+
+       o   To capture only part of a plane the output can be cropped - this
+	   can be used to capture a single window, as long as it has a known
+	   absolute position and size.	For example, to capture and encode the
+	   middle quarter of a 1920x1080 plane:
+
+		   ffmpeg -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,crop=960:540:480:270,scale_vaapi=960:540:nv12' -c:v h264_vaapi output.mp4
+
+   lavfi
+       Libavfilter input virtual device.
+
+       This input device reads data from the open output pads of a libavfilter
+       filtergraph.
+
+       For each filtergraph open output, the input device will create a
+       corresponding stream which is mapped to the generated output.  The
+       filtergraph is specified through the option graph.
+
+       Options
+
+       graph
+	   Specify the filtergraph to use as input. Each video open output
+	   must be labelled by a unique string of the form "outN", where N is
+	   a number starting from 0 corresponding to the mapped input stream
+	   generated by the device.  The first unlabelled output is
+	   automatically assigned to the "out0" label, but all the others need
+	   to be specified explicitly.
+
+	   The suffix "+subcc" can be appended to the output label to create
+	   an extra stream with the closed captions packets attached to that
+	   output (experimental; only for EIA-608 / CEA-708 for now).  The
+	   subcc streams are created after all the normal streams, in the
+	   order of the corresponding stream.  For example, if there is
+	   "out19+subcc", "out7+subcc" and up to "out42", the stream #43 is
+	   subcc for stream #7 and stream #44 is subcc for stream #19.
+
+	   If not specified defaults to the filename specified for the input
+	   device.
+
+       graph_file
+	   Set the filename of the filtergraph to be read and sent to the
+	   other filters. Syntax of the filtergraph is the same as the one
+	   specified by the option graph.
+
+       dumpgraph
+	   Dump graph to stderr.
+
+       Examples
+
+       o   Create a color video stream and play it back with ffplay:
+
+		   ffplay -f lavfi -graph "color=c=pink [out0]" dummy
+
+       o   As the previous example, but use filename for specifying the graph
+	   description, and omit the "out0" label:
+
+		   ffplay -f lavfi color=c=pink
+
+       o   Create three different video test filtered sources and play them:
+
+		   ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate [out2]" test3
+
+       o   Read an audio stream from a file using the amovie source and play
+	   it back with ffplay:
+
+		   ffplay -f lavfi "amovie=test.wav"
+
+       o   Read an audio stream and a video stream and play it back with
+	   ffplay:
+
+		   ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]"
+
+       o   Dump decoded frames to images and closed captions to a file
+	   (experimental):
+
+		   ffmpeg -f lavfi -i "movie=test.ts[out0+subcc]" -map v frame%08d.png -map s -c copy -f rawvideo subcc.bin
+
+   libcdio
+       Audio-CD input device based on libcdio.
+
+       To enable this input device during configuration you need libcdio
+       installed on your system. It requires the configure option
+       "--enable-libcdio".
+
+       This device allows playing and grabbing from an Audio-CD.
+
+       For example to copy with ffmpeg the entire Audio-CD in /dev/sr0, you
+       may run the command:
+
+	       ffmpeg -f libcdio -i /dev/sr0 cd.wav
+
+       Options
+
+       speed
+	   Set drive reading speed. Default value is 0.
+
+	   The speed is specified CD-ROM speed units. The speed is set through
+	   the libcdio "cdio_cddap_speed_set" function. On many CD-ROM drives,
+	   specifying a value too large will result in using the fastest
+	   speed.
+
+       paranoia_mode
+	   Set paranoia recovery mode flags. It accepts one of the following
+	   values:
+
+	   disable
+	   verify
+	   overlap
+	   neverskip
+	   full
+
+	   Default value is disable.
+
+	   For more information about the available recovery modes, consult
+	   the paranoia project documentation.
+
+   libdc1394
+       IIDC1394 input device, based on libdc1394 and libraw1394.
+
+       Requires the configure option "--enable-libdc1394".
+
+       Options
+
+       framerate
+	   Set the frame rate. Default is "ntsc", corresponding to a frame
+	   rate of "30000/1001".
+
+       pixel_format
+	   Select the pixel format. Default is "uyvy422".
+
+       video_size
+	   Set the video size given as a string such as "640x480" or "hd720".
+	   Default is "qvga".
+
+   openal
+       The OpenAL input device provides audio capture on all systems with a
+       working OpenAL 1.1 implementation.
+
+       To enable this input device during configuration, you need OpenAL
+       headers and libraries installed on your system, and need to configure
+       FFmpeg with "--enable-openal".
+
+       OpenAL headers and libraries should be provided as part of your OpenAL
+       implementation, or as an additional download (an SDK). Depending on
+       your installation you may need to specify additional flags via the
+       "--extra-cflags" and "--extra-ldflags" for allowing the build system to
+       locate the OpenAL headers and libraries.
+
+       An incomplete list of OpenAL implementations follows:
+
+       Creative
+	   The official Windows implementation, providing hardware
+	   acceleration with supported devices and software fallback.  See
+	   <http://openal.org/>.
+
+       OpenAL Soft
+	   Portable, open source (LGPL) software implementation. Includes
+	   backends for the most common sound APIs on the Windows, Linux,
+	   Solaris, and BSD operating systems.	See
+	   <http://kcat.strangesoft.net/openal.html>.
+
+       Apple
+	   OpenAL is part of Core Audio, the official Mac OS X Audio
+	   interface.  See
+	   <http://developer.apple.com/technologies/mac/audio-and-video.html>
+
+       This device allows one to capture from an audio input device handled
+       through OpenAL.
+
+       You need to specify the name of the device to capture in the provided
+       filename. If the empty string is provided, the device will
+       automatically select the default device. You can get the list of the
+       supported devices by using the option list_devices.
+
+       Options
+
+       channels
+	   Set the number of channels in the captured audio. Only the values 1
+	   (monaural) and 2 (stereo) are currently supported.  Defaults to 2.
+
+       sample_size
+	   Set the sample size (in bits) of the captured audio. Only the
+	   values 8 and 16 are currently supported. Defaults to 16.
+
+       sample_rate
+	   Set the sample rate (in Hz) of the captured audio.  Defaults to
+	   44.1k.
+
+       list_devices
+	   If set to true, print a list of devices and exit.  Defaults to
+	   false.
+
+       Examples
+
+       Print the list of OpenAL supported devices and exit:
+
+	       $ ffmpeg -list_devices true -f openal -i dummy out.ogg
+
+       Capture from the OpenAL device DR-BT101 via PulseAudio:
+
+	       $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out.ogg
+
+       Capture from the default device (note the empty string '' as filename):
+
+	       $ ffmpeg -f openal -i '' out.ogg
+
+       Capture from two devices simultaneously, writing to two different
+       files, within the same ffmpeg command:
+
+	       $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out1.ogg -f openal -i 'ALSA Default' out2.ogg
+
+       Note: not all OpenAL implementations support multiple simultaneous
+       capture - try the latest OpenAL Soft if the above does not work.
+
+   oss
+       Open Sound System input device.
+
+       The filename to provide to the input device is the device node
+       representing the OSS input device, and is usually set to /dev/dsp.
+
+       For example to grab from /dev/dsp using ffmpeg use the command:
+
+	       ffmpeg -f oss -i /dev/dsp /tmp/oss.wav
+
+       For more information about OSS see:
+       <http://manuals.opensound.com/usersguide/dsp.html>
+
+       Options
+
+       sample_rate
+	   Set the sample rate in Hz. Default is 48000.
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   pulse
+       PulseAudio input device.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-libpulse".
+
+       The filename to provide to the input device is a source device or the
+       string "default"
+
+       To list the PulseAudio source devices and their properties you can
+       invoke the command pactl list sources.
+
+       More information about PulseAudio can be found on
+       <http://www.pulseaudio.org>.
+
+       Options
+
+       server
+	   Connect to a specific PulseAudio server, specified by an IP
+	   address.  Default server is used when not provided.
+
+       name
+	   Specify the application name PulseAudio will use when showing
+	   active clients, by default it is the "LIBAVFORMAT_IDENT" string.
+
+       stream_name
+	   Specify the stream name PulseAudio will use when showing active
+	   streams, by default it is "record".
+
+       sample_rate
+	   Specify the samplerate in Hz, by default 48kHz is used.
+
+       channels
+	   Specify the channels in use, by default 2 (stereo) is set.
+
+       frame_size
+	   This option does nothing and is deprecated.
+
+       fragment_size
+	   Specify the size in bytes of the minimal buffering fragment in
+	   PulseAudio, it will affect the audio latency. By default it is set
+	   to 50 ms amount of data.
+
+       wallclock
+	   Set the initial PTS using the current time. Default is 1.
+
+       Examples
+
+       Record a stream from default device:
+
+	       ffmpeg -f pulse -i default /tmp/pulse.wav
+
+   sndio
+       sndio input device.
+
+       To enable this input device during configuration you need libsndio
+       installed on your system.
+
+       The filename to provide to the input device is the device node
+       representing the sndio input device, and is usually set to /dev/audio0.
+
+       For example to grab from /dev/audio0 using ffmpeg use the command:
+
+	       ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav
+
+       Options
+
+       sample_rate
+	   Set the sample rate in Hz. Default is 48000.
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   video4linux2, v4l2
+       Video4Linux2 input video device.
+
+       "v4l2" can be used as alias for "video4linux2".
+
+       If FFmpeg is built with v4l-utils support (by using the
+       "--enable-libv4l2" configure option), it is possible to use it with the
+       "-use_libv4l2" input device option.
+
+       The name of the device to grab is a file device node, usually Linux
+       systems tend to automatically create such nodes when the device (e.g.
+       an USB webcam) is plugged into the system, and has a name of the kind
+       /dev/videoN, where N is a number associated to the device.
+
+       Video4Linux2 devices usually support a limited set of widthxheight
+       sizes and frame rates. You can check which are supported using
+       -list_formats all for Video4Linux2 devices.  Some devices, like TV
+       cards, support one or more standards. It is possible to list all the
+       supported standards using -list_standards all.
+
+       The time base for the timestamps is 1 microsecond. Depending on the
+       kernel version and configuration, the timestamps may be derived from
+       the real time clock (origin at the Unix Epoch) or the monotonic clock
+       (origin usually at boot time, unaffected by NTP or manual changes to
+       the clock). The -timestamps abs or -ts abs option can be used to force
+       conversion into the real time clock.
+
+       Some usage examples of the video4linux2 device with ffmpeg and ffplay:
+
+       o   List supported formats for a video4linux2 device:
+
+		   ffplay -f video4linux2 -list_formats all /dev/video0
+
+       o   Grab and show the input of a video4linux2 device:
+
+		   ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
+
+       o   Grab and record the input of a video4linux2 device, leave the frame
+	   rate and size as previously set:
+
+		   ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg
+
+       For more information about Video4Linux, check <http://linuxtv.org/>.
+
+       Options
+
+       standard
+	   Set the standard. Must be the name of a supported standard. To get
+	   a list of the supported standards, use the list_standards option.
+
+       channel
+	   Set the input channel number. Default to -1, which means using the
+	   previously selected channel.
+
+       video_size
+	   Set the video frame size. The argument must be a string in the form
+	   WIDTHxHEIGHT or a valid size abbreviation.
+
+       pixel_format
+	   Select the pixel format (only valid for raw video input).
+
+       input_format
+	   Set the preferred pixel format (for raw video) or a codec name.
+	   This option allows one to select the input format, when several are
+	   available.
+
+       framerate
+	   Set the preferred video frame rate.
+
+       list_formats
+	   List available formats (supported pixel formats, codecs, and frame
+	   sizes) and exit.
+
+	   Available values are:
+
+	   all Show all available (compressed and non-compressed) formats.
+
+	   raw Show only raw video (non-compressed) formats.
+
+	   compressed
+	       Show only compressed formats.
+
+       list_standards
+	   List supported standards and exit.
+
+	   Available values are:
+
+	   all Show all supported standards.
+
+       timestamps, ts
+	   Set type of timestamps for grabbed frames.
+
+	   Available values are:
+
+	   default
+	       Use timestamps from the kernel.
+
+	   abs Use absolute timestamps (wall clock).
+
+	   mono2abs
+	       Force conversion from monotonic to absolute timestamps.
+
+	   Default value is "default".
+
+       use_libv4l2
+	   Use libv4l2 (v4l-utils) conversion functions. Default is 0.
+
+   vfwcap
+       VfW (Video for Windows) capture input device.
+
+       The filename passed as input is the capture driver number, ranging from
+       0 to 9. You may use "list" as filename to print a list of drivers. Any
+       other filename will be interpreted as device number 0.
+
+       Options
+
+       video_size
+	   Set the video frame size.
+
+       framerate
+	   Set the grabbing frame rate. Default value is "ntsc", corresponding
+	   to a frame rate of "30000/1001".
+
+   x11grab
+       X11 video input device.
+
+       To enable this input device during configuration you need libxcb
+       installed on your system. It will be automatically detected during
+       configuration.
+
+       This device allows one to capture a region of an X11 display.
+
+       The filename passed as input has the syntax:
+
+	       [<hostname>]:<display_number>.<screen_number>[+<x_offset>,<y_offset>]
+
+       hostname:display_number.screen_number specifies the X11 display name of
+       the screen to grab from. hostname can be omitted, and defaults to
+       "localhost". The environment variable DISPLAY contains the default
+       display name.
+
+       x_offset and y_offset specify the offsets of the grabbed area with
+       respect to the top-left border of the X11 screen. They default to 0.
+
+       Check the X11 documentation (e.g. man X) for more detailed information.
+
+       Use the xdpyinfo program for getting basic information about the
+       properties of your X11 display (e.g. grep for "name" or "dimensions").
+
+       For example to grab from :0.0 using ffmpeg:
+
+	       ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0 out.mpg
+
+       Grab at position "10,20":
+
+	       ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
+
+       Options
+
+       select_region
+	   Specify whether to select the grabbing area graphically using the
+	   pointer.  A value of 1 prompts the user to select the grabbing area
+	   graphically by clicking and dragging. A single click with no
+	   dragging will select the whole screen. A region with zero width or
+	   height will also select the whole screen. This option overwrites
+	   the video_size, grab_x, and grab_y options. Default value is 0.
+
+       draw_mouse
+	   Specify whether to draw the mouse pointer. A value of 0 specifies
+	   not to draw the pointer. Default value is 1.
+
+       follow_mouse
+	   Make the grabbed area follow the mouse. The argument can be
+	   "centered" or a number of pixels PIXELS.
+
+	   When it is specified with "centered", the grabbing region follows
+	   the mouse pointer and keeps the pointer at the center of region;
+	   otherwise, the region follows only when the mouse pointer reaches
+	   within PIXELS (greater than zero) to the edge of region.
+
+	   For example:
+
+		   ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 out.mpg
+
+	   To follow only when the mouse pointer reaches within 100 pixels to
+	   edge:
+
+		   ffmpeg -f x11grab -follow_mouse 100 -framerate 25 -video_size cif -i :0.0 out.mpg
+
+       framerate
+	   Set the grabbing frame rate. Default value is "ntsc", corresponding
+	   to a frame rate of "30000/1001".
+
+       show_region
+	   Show grabbed region on screen.
+
+	   If show_region is specified with 1, then the grabbing region will
+	   be indicated on screen. With this option, it is easy to know what
+	   is being grabbed if only a portion of the screen is grabbed.
+
+       region_border
+	   Set the region border thickness if -show_region 1 is used.  Range
+	   is 1 to 128 and default is 3 (XCB-based x11grab only).
+
+	   For example:
+
+		   ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
+
+	   With follow_mouse:
+
+		   ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
+
+       window_id
+	   Grab this window, instead of the whole screen. Default value is 0,
+	   which maps to the whole screen (root window).
+
+	   The id of a window can be found using the xwininfo program,
+	   possibly with options -tree and -root.
+
+	   If the window is later enlarged, the new area is not recorded.
+	   Video ends when the window is closed, unmapped (i.e., iconified) or
+	   shrunk beyond the video size (which defaults to the initial window
+	   size).
+
+	   This option disables options follow_mouse and select_region.
+
+       video_size
+	   Set the video frame size. Default is the full desktop or window.
+
+       grab_x
+       grab_y
+	   Set the grabbing region coordinates. They are expressed as offset
+	   from the top left corner of the X11 window and correspond to the
+	   x_offset and y_offset parameters in the device name. The default
+	   value for both options is 0.
+
+OUTPUT DEVICES
+       Output devices are configured elements in FFmpeg that can write
+       multimedia data to an output device attached to your system.
+
+       When you configure your FFmpeg build, all the supported output devices
+       are enabled by default. You can list all available ones using the
+       configure option "--list-outdevs".
+
+       You can disable all the output devices using the configure option
+       "--disable-outdevs", and selectively enable an output device using the
+       option "--enable-outdev=OUTDEV", or you can disable a particular input
+       device using the option "--disable-outdev=OUTDEV".
+
+       The option "-devices" of the ff* tools will display the list of enabled
+       output devices.
+
+       A description of the currently available output devices follows.
+
+   alsa
+       ALSA (Advanced Linux Sound Architecture) output device.
+
+       Examples
+
+       o   Play a file on default ALSA device:
+
+		   ffmpeg -i INPUT -f alsa default
+
+       o   Play a file on soundcard 1, audio device 7:
+
+		   ffmpeg -i INPUT -f alsa hw:1,7
+
+   AudioToolbox
+       AudioToolbox output device.
+
+       Allows native output to CoreAudio devices on OSX.
+
+       The output filename can be empty (or "-") to refer to the default
+       system output device or a number that refers to the device index as
+       shown using: "-list_devices true".
+
+       Alternatively, the audio input device can be chosen by index using the
+
+	   B<-audio_device_index E<lt>INDEXE<gt>>
+
+       , overriding any device name or index given in the input filename.
+
+       All available devices can be enumerated by using -list_devices true,
+       listing all device names, UIDs and corresponding indices.
+
+       Options
+
+       AudioToolbox supports the following options:
+
+       -audio_device_index <INDEX>
+	   Specify the audio device by its index. Overrides anything given in
+	   the output filename.
+
+       Examples
+
+       o   Print the list of supported devices and output a sine wave to the
+	   default device:
+
+		   $ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -list_devices true -
+
+       o   Output a sine wave to the device with the index 2, overriding any
+	   output filename:
+
+		   $ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -audio_device_index 2 -
+
+   caca
+       CACA output device.
+
+       This output device allows one to show a video stream in CACA window.
+       Only one CACA window is allowed per application, so you can have only
+       one instance of this output device in an application.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-libcaca".  libcaca is a graphics library that outputs text
+       instead of pixels.
+
+       For more information about libcaca, check:
+       <http://caca.zoy.org/wiki/libcaca>
+
+       Options
+
+       window_title
+	   Set the CACA window title, if not specified default to the filename
+	   specified for the output device.
+
+       window_size
+	   Set the CACA window size, can be a string of the form widthxheight
+	   or a video size abbreviation.  If not specified it defaults to the
+	   size of the input video.
+
+       driver
+	   Set display driver.
+
+       algorithm
+	   Set dithering algorithm. Dithering is necessary because the picture
+	   being rendered has usually far more colours than the available
+	   palette.  The accepted values are listed with "-list_dither
+	   algorithms".
+
+       antialias
+	   Set antialias method. Antialiasing smoothens the rendered image and
+	   avoids the commonly seen staircase effect.  The accepted values are
+	   listed with "-list_dither antialiases".
+
+       charset
+	   Set which characters are going to be used when rendering text.  The
+	   accepted values are listed with "-list_dither charsets".
+
+       color
+	   Set color to be used when rendering text.  The accepted values are
+	   listed with "-list_dither colors".
+
+       list_drivers
+	   If set to true, print a list of available drivers and exit.
+
+       list_dither
+	   List available dither options related to the argument.  The
+	   argument must be one of "algorithms", "antialiases", "charsets",
+	   "colors".
+
+       Examples
+
+       o   The following command shows the ffmpeg output is an CACA window,
+	   forcing its size to 80x25:
+
+		   ffmpeg -i INPUT -c:v rawvideo -pix_fmt rgb24 -window_size 80x25 -f caca -
+
+       o   Show the list of available drivers and exit:
+
+		   ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers true -
+
+       o   Show the list of available dither colors and exit:
+
+		   ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
+
+   decklink
+       The decklink output device provides playback capabilities for
+       Blackmagic DeckLink devices.
+
+       To enable this output device, you need the Blackmagic DeckLink SDK and
+       you need to configure with the appropriate "--extra-cflags" and
+       "--extra-ldflags".  On Windows, you need to run the IDL files through
+       widl.
+
+       DeckLink is very picky about the formats it supports. Pixel format is
+       always uyvy422, framerate, field order and video size must be
+       determined for your device with -list_formats 1. Audio sample rate is
+       always 48 kHz.
+
+       Options
+
+       list_devices
+	   If set to true, print a list of devices and exit.  Defaults to
+	   false. This option is deprecated, please use the "-sinks" option of
+	   ffmpeg to list the available output devices.
+
+       list_formats
+	   If set to true, print a list of supported formats and exit.
+	   Defaults to false.
+
+       preroll
+	   Amount of time to preroll video in seconds.	Defaults to 0.5.
+
+       duplex_mode
+	   Sets the decklink device duplex/profile mode. Must be unset, half,
+	   full, one_sub_device_full, one_sub_device_half,
+	   two_sub_device_full, four_sub_device_half Defaults to unset.
+
+	   Note: DeckLink SDK 11.0 have replaced the duplex property by a
+	   profile property.  For the DeckLink Duo 2 and DeckLink Quad 2, a
+	   profile is shared between any 2 sub-devices that utilize the same
+	   connectors. For the DeckLink 8K Pro, a profile is shared between
+	   all 4 sub-devices. So DeckLink 8K Pro support four profiles.
+
+	   Valid profile modes for DeckLink 8K Pro(with DeckLink SDK >= 11.0):
+	   one_sub_device_full, one_sub_device_half, two_sub_device_full,
+	   four_sub_device_half
+
+	   Valid profile modes for DeckLink Quad 2 and DeckLink Duo 2: half,
+	   full
+
+       timing_offset
+	   Sets the genlock timing pixel offset on the used output.  Defaults
+	   to unset.
+
+       link
+	   Sets the SDI video link configuration on the used output. Must be
+	   unset, single link SDI, dual link SDI or quad link SDI.  Defaults
+	   to unset.
+
+       sqd Enable Square Division Quad Split mode for Quad-link SDI output.
+	   Must be unset, true or false.  Defaults to unset.
+
+       level_a
+	   Enable SMPTE Level A mode on the used output.  Must be unset, true
+	   or false.  Defaults to unset.
+
+       vanc_queue_size
+	   Sets maximum output buffer size in bytes for VANC data. If the
+	   buffering reaches this value, outgoing VANC data will be dropped.
+	   Defaults to 1048576.
+
+       Examples
+
+       o   List output devices:
+
+		   ffmpeg -sinks decklink
+
+       o   List supported formats:
+
+		   ffmpeg -i test.avi -f decklink -list_formats 1 'DeckLink Mini Monitor'
+
+       o   Play video clip:
+
+		   ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 'DeckLink Mini Monitor'
+
+       o   Play video clip with non-standard framerate or video size:
+
+		   ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 -s 720x486 -r 24000/1001 'DeckLink Mini Monitor'
+
+   fbdev
+       Linux framebuffer output device.
+
+       The Linux framebuffer is a graphic hardware-independent abstraction
+       layer to show graphics on a computer monitor, typically on the console.
+       It is accessed through a file device node, usually /dev/fb0.
+
+       For more detailed information read the file
+       Documentation/fb/framebuffer.txt included in the Linux source tree.
+
+       Options
+
+       xoffset
+       yoffset
+	   Set x/y coordinate of top left corner. Default is 0.
+
+       Examples
+
+       Play a file on framebuffer device /dev/fb0.  Required pixel format
+       depends on current framebuffer settings.
+
+	       ffmpeg -re -i INPUT -c:v rawvideo -pix_fmt bgra -f fbdev /dev/fb0
+
+       See also <http://linux-fbdev.sourceforge.net/>, and fbset(1).
+
+   opengl
+       OpenGL output device. Deprecated and will be removed.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-opengl".
+
+       This output device allows one to render to OpenGL context.  Context may
+       be provided by application or default SDL window is created.
+
+       When device renders to external context, application must implement
+       handlers for following messages: "AV_DEV_TO_APP_CREATE_WINDOW_BUFFER" -
+       create OpenGL context on current thread.
+       "AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER" - make OpenGL context current.
+       "AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER" - swap buffers.
+       "AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER" - destroy OpenGL context.
+       Application is also required to inform a device about current
+       resolution by sending "AV_APP_TO_DEV_WINDOW_SIZE" message.
+
+       Options
+
+       background
+	   Set background color. Black is a default.
+
+       no_window
+	   Disables default SDL window when set to non-zero value.
+	   Application must provide OpenGL context and both "window_size_cb"
+	   and "window_swap_buffers_cb" callbacks when set.
+
+       window_title
+	   Set the SDL window title, if not specified default to the filename
+	   specified for the output device.  Ignored when no_window is set.
+
+       window_size
+	   Set preferred window size, can be a string of the form widthxheight
+	   or a video size abbreviation.  If not specified it defaults to the
+	   size of the input video, downscaled according to the aspect ratio.
+	   Mostly usable when no_window is not set.
+
+       Examples
+
+       Play a file on SDL window using OpenGL rendering:
+
+	       ffmpeg  -i INPUT -f opengl "window title"
+
+   oss
+       OSS (Open Sound System) output device.
+
+   pulse
+       PulseAudio output device.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-libpulse".
+
+       More information about PulseAudio can be found on
+       <http://www.pulseaudio.org>
+
+       Options
+
+       server
+	   Connect to a specific PulseAudio server, specified by an IP
+	   address.  Default server is used when not provided.
+
+       name
+	   Specify the application name PulseAudio will use when showing
+	   active clients, by default it is the "LIBAVFORMAT_IDENT" string.
+
+       stream_name
+	   Specify the stream name PulseAudio will use when showing active
+	   streams, by default it is set to the specified output name.
+
+       device
+	   Specify the device to use. Default device is used when not
+	   provided.  List of output devices can be obtained with command
+	   pactl list sinks.
+
+       buffer_size
+       buffer_duration
+	   Control the size and duration of the PulseAudio buffer. A small
+	   buffer gives more control, but requires more frequent updates.
+
+	   buffer_size specifies size in bytes while buffer_duration specifies
+	   duration in milliseconds.
+
+	   When both options are provided then the highest value is used
+	   (duration is recalculated to bytes using stream parameters). If
+	   they are set to 0 (which is default), the device will use the
+	   default PulseAudio duration value. By default PulseAudio set buffer
+	   duration to around 2 seconds.
+
+       prebuf
+	   Specify pre-buffering size in bytes. The server does not start with
+	   playback before at least prebuf bytes are available in the buffer.
+	   By default this option is initialized to the same value as
+	   buffer_size or buffer_duration (whichever is bigger).
+
+       minreq
+	   Specify minimum request size in bytes. The server does not request
+	   less than minreq bytes from the client, instead waits until the
+	   buffer is free enough to request more bytes at once. It is
+	   recommended to not set this option, which will initialize this to a
+	   value that is deemed sensible by the server.
+
+       Examples
+
+       Play a file on default device on default server:
+
+	       ffmpeg  -i INPUT -f pulse "stream name"
+
+   sdl
+       SDL (Simple DirectMedia Layer) output device. Deprecated and will be
+       removed.
+
+       For monitoring purposes in FFmpeg, pipes and a video player such as
+       ffplay can be used:
+
+	       ffmpeg -i INPUT -f nut -c:v rawvideo - | ffplay -
+
+       "sdl2" can be used as alias for "sdl".
+
+       This output device allows one to show a video stream in an SDL window.
+       Only one SDL window is allowed per application, so you can have only
+       one instance of this output device in an application.
+
+       To enable this output device you need libsdl installed on your system
+       when configuring your build.
+
+       For more information about SDL, check: <http://www.libsdl.org/>
+
+       Options
+
+       window_borderless
+	   Set SDL window border off.  Default value is 0 (enable window
+	   border).
+
+       window_enable_quit
+	   Enable quit action (using window button or keyboard key) when non-
+	   zero value is provided.  Default value is 1 (enable quit action).
+
+       window_fullscreen
+	   Set fullscreen mode when non-zero value is provided.  Default value
+	   is zero.
+
+       window_size
+	   Set the SDL window size, can be a string of the form widthxheight
+	   or a video size abbreviation.  If not specified it defaults to the
+	   size of the input video, downscaled according to the aspect ratio.
+
+       window_title
+	   Set the SDL window title, if not specified default to the filename
+	   specified for the output device.
+
+       window_x
+       window_y
+	   Set the position of the window on the screen.
+
+       Interactive commands
+
+       The window created by the device can be controlled through the
+       following interactive commands.
+
+       q, ESC
+	   Quit the device immediately.
+
+       Examples
+
+       The following command shows the ffmpeg output is an SDL window, forcing
+       its size to the qcif format:
+
+	       ffmpeg -i INPUT -c:v rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL output"
+
+   sndio
+       sndio audio output device.
+
+   v4l2
+       Video4Linux2 output device.
+
+   xv
+       XV (XVideo) output device.
+
+       This output device allows one to show a video stream in a X Window
+       System window.
+
+       Options
+
+       display_name
+	   Specify the hardware display name, which determines the display and
+	   communications domain to be used.
+
+	   The display name or DISPLAY environment variable can be a string in
+	   the format hostname[:number[.screen_number]].
+
+	   hostname specifies the name of the host machine on which the
+	   display is physically attached. number specifies the number of the
+	   display server on that host machine. screen_number specifies the
+	   screen to be used on that server.
+
+	   If unspecified, it defaults to the value of the DISPLAY environment
+	   variable.
+
+	   For example, "dual-headed:0.1" would specify screen 1 of display 0
+	   on the machine named ``dual-headed''.
+
+	   Check the X11 specification for more detailed information about the
+	   display name format.
+
+       window_id
+	   When set to non-zero value then device doesn't create new window,
+	   but uses existing one with provided window_id. By default this
+	   options is set to zero and device creates its own window.
+
+       window_size
+	   Set the created window size, can be a string of the form
+	   widthxheight or a video size abbreviation. If not specified it
+	   defaults to the size of the input video.  Ignored when window_id is
+	   set.
+
+       window_x
+       window_y
+	   Set the X and Y window offsets for the created window. They are
+	   both set to 0 by default. The values may be ignored by the window
+	   manager.  Ignored when window_id is set.
+
+       window_title
+	   Set the window title, if not specified default to the filename
+	   specified for the output device. Ignored when window_id is set.
+
+       For more information about XVideo see <http://www.x.org/>.
+
+       Examples
+
+       o   Decode, display and encode video input with ffmpeg at the same
+	   time:
+
+		   ffmpeg -i INPUT OUTPUT -f xv display
+
+       o   Decode and display the input video to multiple X11 windows:
+
+		   ffmpeg -i INPUT -f xv normal -vf negate -f xv negated
+
+RESAMPLER OPTIONS
+       The audio resampler supports the following named options.
+
+       Options may be set by specifying -option value in the FFmpeg tools,
+       option=value for the aresample filter, by setting the value explicitly
+       in the "SwrContext" options or using the libavutil/opt.h API for
+       programmatic use.
+
+       uchl, used_chlayout
+	   Set used input channel layout. Default is unset. This option is
+	   only used for special remapping.
+
+       isr, in_sample_rate
+	   Set the input sample rate. Default value is 0.
+
+       osr, out_sample_rate
+	   Set the output sample rate. Default value is 0.
+
+       isf, in_sample_fmt
+	   Specify the input sample format. It is set by default to "none".
+
+       osf, out_sample_fmt
+	   Specify the output sample format. It is set by default to "none".
+
+       tsf, internal_sample_fmt
+	   Set the internal sample format. Default value is "none".  This will
+	   automatically be chosen when it is not explicitly set.
+
+       ichl, in_chlayout
+       ochl, out_chlayout
+	   Set the input/output channel layout.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       clev, center_mix_level
+	   Set the center mix level. It is a value expressed in deciBel, and
+	   must be in the interval [-32,32].
+
+       slev, surround_mix_level
+	   Set the surround mix level. It is a value expressed in deciBel, and
+	   must be in the interval [-32,32].
+
+       lfe_mix_level
+	   Set LFE mix into non LFE level. It is used when there is a LFE
+	   input but no LFE output. It is a value expressed in deciBel, and
+	   must be in the interval [-32,32].
+
+       rmvol, rematrix_volume
+	   Set rematrix volume. Default value is 1.0.
+
+       rematrix_maxval
+	   Set maximum output value for rematrixing.  This can be used to
+	   prevent clipping vs. preventing volume reduction.  A value of 1.0
+	   prevents clipping.
+
+       flags, swr_flags
+	   Set flags used by the converter. Default value is 0.
+
+	   It supports the following individual flags:
+
+	   res force resampling, this flag forces resampling to be used even
+	       when the input and output sample rates match.
+
+       dither_scale
+	   Set the dither scale. Default value is 1.
+
+       dither_method
+	   Set dither method. Default value is 0.
+
+	   Supported values:
+
+	   rectangular
+	       select rectangular dither
+
+	   triangular
+	       select triangular dither
+
+	   triangular_hp
+	       select triangular dither with high pass
+
+	   lipshitz
+	       select Lipshitz noise shaping dither.
+
+	   shibata
+	       select Shibata noise shaping dither.
+
+	   low_shibata
+	       select low Shibata noise shaping dither.
+
+	   high_shibata
+	       select high Shibata noise shaping dither.
+
+	   f_weighted
+	       select f-weighted noise shaping dither
+
+	   modified_e_weighted
+	       select modified-e-weighted noise shaping dither
+
+	   improved_e_weighted
+	       select improved-e-weighted noise shaping dither
+
+       resampler
+	   Set resampling engine. Default value is swr.
+
+	   Supported values:
+
+	   swr select the native SW Resampler; filter options precision and
+	       cheby are not applicable in this case.
+
+	   soxr
+	       select the SoX Resampler (where available); compensation, and
+	       filter options filter_size, phase_shift, exact_rational,
+	       filter_type & kaiser_beta, are not applicable in this case.
+
+       filter_size
+	   For swr only, set resampling filter size, default value is 32.
+
+       phase_shift
+	   For swr only, set resampling phase shift, default value is 10, and
+	   must be in the interval [0,30].
+
+       linear_interp
+	   Use linear interpolation when enabled (the default). Disable it if
+	   you want to preserve speed instead of quality when exact_rational
+	   fails.
+
+       exact_rational
+	   For swr only, when enabled, try to use exact phase_count based on
+	   input and output sample rate. However, if it is larger than "1 <<
+	   phase_shift", the phase_count will be "1 << phase_shift" as
+	   fallback. Default is enabled.
+
+       cutoff
+	   Set cutoff frequency (swr: 6dB point; soxr: 0dB point) ratio; must
+	   be a float value between 0 and 1.  Default value is 0.97 with swr,
+	   and 0.91 with soxr (which, with a sample-rate of 44100, preserves
+	   the entire audio band to 20kHz).
+
+       precision
+	   For soxr only, the precision in bits to which the resampled signal
+	   will be calculated.	The default value of 20 (which, with suitable
+	   dithering, is appropriate for a destination bit-depth of 16) gives
+	   SoX's 'High Quality'; a value of 28 gives SoX's 'Very High
+	   Quality'.
+
+       cheby
+	   For soxr only, selects passband rolloff none (Chebyshev) & higher-
+	   precision approximation for 'irrational' ratios. Default value is
+	   0.
+
+       async
+	   For swr only, simple 1 parameter audio sync to timestamps using
+	   stretching, squeezing, filling and trimming. Setting this to 1 will
+	   enable filling and trimming, larger values represent the maximum
+	   amount in samples that the data may be stretched or squeezed for
+	   each second.  Default value is 0, thus no compensation is applied
+	   to make the samples match the audio timestamps.
+
+       first_pts
+	   For swr only, assume the first pts should be this value. The time
+	   unit is 1 / sample rate.  This allows for padding/trimming at the
+	   start of stream. By default, no assumption is made about the first
+	   frame's expected pts, so no padding or trimming is done. For
+	   example, this could be set to 0 to pad the beginning with silence
+	   if an audio stream starts after the video stream or to trim any
+	   samples with a negative pts due to encoder delay.
+
+       min_comp
+	   For swr only, set the minimum difference between timestamps and
+	   audio data (in seconds) to trigger stretching/squeezing/filling or
+	   trimming of the data to make it match the timestamps. The default
+	   is that stretching/squeezing/filling and trimming is disabled
+	   (min_comp = "FLT_MAX").
+
+       min_hard_comp
+	   For swr only, set the minimum difference between timestamps and
+	   audio data (in seconds) to trigger adding/dropping samples to make
+	   it match the timestamps.  This option effectively is a threshold to
+	   select between hard (trim/fill) and soft (squeeze/stretch)
+	   compensation. Note that all compensation is by default disabled
+	   through min_comp.  The default is 0.1.
+
+       comp_duration
+	   For swr only, set duration (in seconds) over which data is
+	   stretched/squeezed to make it match the timestamps. Must be a non-
+	   negative double float value, default value is 1.0.
+
+       max_soft_comp
+	   For swr only, set maximum factor by which data is
+	   stretched/squeezed to make it match the timestamps. Must be a non-
+	   negative double float value, default value is 0.
+
+       matrix_encoding
+	   Select matrixed stereo encoding.
+
+	   It accepts the following values:
+
+	   none
+	       select none
+
+	   dolby
+	       select Dolby
+
+	   dplii
+	       select Dolby Pro Logic II
+
+	   Default value is "none".
+
+       filter_type
+	   For swr only, select resampling filter type. This only affects
+	   resampling operations.
+
+	   It accepts the following values:
+
+	   cubic
+	       select cubic
+
+	   blackman_nuttall
+	       select Blackman Nuttall windowed sinc
+
+	   kaiser
+	       select Kaiser windowed sinc
+
+       kaiser_beta
+	   For swr only, set Kaiser window beta value. Must be a double float
+	   value in the interval [2,16], default value is 9.
+
+       output_sample_bits
+	   For swr only, set number of used output sample bits for dithering.
+	   Must be an integer in the interval [0,64], default value is 0,
+	   which means it's not used.
+
+SCALER OPTIONS
+       The video scaler supports the following named options.
+
+       Options may be set by specifying -option value in the FFmpeg tools,
+       with a few API-only exceptions noted below.  For programmatic use, they
+       can be set explicitly in the "SwsContext" options or through the
+       libavutil/opt.h API.
+
+       sws_flags
+	   Set the scaler flags. This is also used to set the scaling
+	   algorithm. Only a single algorithm should be selected. Default
+	   value is bicubic.
+
+	   It accepts the following values:
+
+	   fast_bilinear
+	       Select fast bilinear scaling algorithm.
+
+	   bilinear
+	       Select bilinear scaling algorithm.
+
+	   bicubic
+	       Select bicubic scaling algorithm.
+
+	   experimental
+	       Select experimental scaling algorithm.
+
+	   neighbor
+	       Select nearest neighbor rescaling algorithm.
+
+	   area
+	       Select averaging area rescaling algorithm.
+
+	   bicublin
+	       Select bicubic scaling algorithm for the luma component,
+	       bilinear for chroma components.
+
+	   gauss
+	       Select Gaussian rescaling algorithm.
+
+	   sinc
+	       Select sinc rescaling algorithm.
+
+	   lanczos
+	       Select Lanczos rescaling algorithm. The default width (alpha)
+	       is 3 and can be changed by setting "param0".
+
+	   spline
+	       Select natural bicubic spline rescaling algorithm.
+
+	   print_info
+	       Enable printing/debug logging.
+
+	   accurate_rnd
+	       Enable accurate rounding.
+
+	   full_chroma_int
+	       Enable full chroma interpolation.
+
+	   full_chroma_inp
+	       Select full chroma input.
+
+	   bitexact
+	       Enable bitexact output.
+
+       srcw (API only)
+	   Set source width.
+
+       srch (API only)
+	   Set source height.
+
+       dstw (API only)
+	   Set destination width.
+
+       dsth (API only)
+	   Set destination height.
+
+       src_format (API only)
+	   Set source pixel format (must be expressed as an integer).
+
+       dst_format (API only)
+	   Set destination pixel format (must be expressed as an integer).
+
+       src_range (boolean)
+	   If value is set to 1, indicates source is full range. Default value
+	   is 0, which indicates source is limited range.
+
+       dst_range (boolean)
+	   If value is set to 1, enable full range for destination. Default
+	   value is 0, which enables limited range.
+
+       param0, param1
+	   Set scaling algorithm parameters. The specified values are specific
+	   of some scaling algorithms and ignored by others. The specified
+	   values are floating point number values.
+
+       sws_dither
+	   Set the dithering algorithm. Accepts one of the following values.
+	   Default value is auto.
+
+	   auto
+	       automatic choice
+
+	   none
+	       no dithering
+
+	   bayer
+	       bayer dither
+
+	   ed  error diffusion dither
+
+	   a_dither
+	       arithmetic dither, based using addition
+
+	   x_dither
+	       arithmetic dither, based using xor (more random/less apparent
+	       patterning that a_dither).
+
+       alphablend
+	   Set the alpha blending to use when the input has alpha but the
+	   output does not.  Default value is none.
+
+	   uniform_color
+	       Blend onto a uniform background color
+
+	   checkerboard
+	       Blend onto a checkerboard
+
+	   none
+	       No blending
+
+FILTERING INTRODUCTION
+       Filtering in FFmpeg is enabled through the libavfilter library.
+
+       In libavfilter, a filter can have multiple inputs and multiple outputs.
+       To illustrate the sorts of things that are possible, we consider the
+       following filtergraph.
+
+			       [main]
+	       input --> split ---------------------> overlay --> output
+			   |				 ^
+			   |[tmp]		   [flip]|
+			   +-----> crop --> vflip -------+
+
+       This filtergraph splits the input stream in two streams, then sends one
+       stream through the crop filter and the vflip filter, before merging it
+       back with the other stream by overlaying it on top. You can use the
+       following command to achieve this:
+
+	       ffmpeg -i INPUT -vf "split [main][tmp]; [tmp] crop=iw:ih/2:0:0, vflip [flip]; [main][flip] overlay=0:H/2" OUTPUT
+
+       The result will be that the top half of the video is mirrored onto the
+       bottom half of the output video.
+
+       Filters in the same linear chain are separated by commas, and distinct
+       linear chains of filters are separated by semicolons. In our example,
+       crop,vflip are in one linear chain, split and overlay are separately in
+       another. The points where the linear chains join are labelled by names
+       enclosed in square brackets. In the example, the split filter generates
+       two outputs that are associated to the labels [main] and [tmp].
+
+       The stream sent to the second output of split, labelled as [tmp], is
+       processed through the crop filter, which crops away the lower half part
+       of the video, and then vertically flipped. The overlay filter takes in
+       input the first unchanged output of the split filter (which was
+       labelled as [main]), and overlay on its lower half the output generated
+       by the crop,vflip filterchain.
+
+       Some filters take in input a list of parameters: they are specified
+       after the filter name and an equal sign, and are separated from each
+       other by a colon.
+
+       There exist so-called source filters that do not have an audio/video
+       input, and sink filters that will not have audio/video output.
+
+GRAPH
+       The graph2dot program included in the FFmpeg tools directory can be
+       used to parse a filtergraph description and issue a corresponding
+       textual representation in the dot language.
+
+       Invoke the command:
+
+	       graph2dot -h
+
+       to see how to use graph2dot.
+
+       You can then pass the dot description to the dot program (from the
+       graphviz suite of programs) and obtain a graphical representation of
+       the filtergraph.
+
+       For example the sequence of commands:
+
+	       echo <GRAPH_DESCRIPTION> | \
+	       tools/graph2dot -o graph.tmp && \
+	       dot -Tpng graph.tmp -o graph.png && \
+	       display graph.png
+
+       can be used to create and display an image representing the graph
+       described by the GRAPH_DESCRIPTION string. Note that this string must
+       be a complete self-contained graph, with its inputs and outputs
+       explicitly defined.  For example if your command line is of the form:
+
+	       ffmpeg -i infile -vf scale=640:360 outfile
+
+       your GRAPH_DESCRIPTION string will need to be of the form:
+
+	       nullsrc,scale=640:360,nullsink
+
+       you may also need to set the nullsrc parameters and add a format filter
+       in order to simulate a specific input file.
+
+FILTERGRAPH DESCRIPTION
+       A filtergraph is a directed graph of connected filters. It can contain
+       cycles, and there can be multiple links between a pair of filters. Each
+       link has one input pad on one side connecting it to one filter from
+       which it takes its input, and one output pad on the other side
+       connecting it to one filter accepting its output.
+
+       Each filter in a filtergraph is an instance of a filter class
+       registered in the application, which defines the features and the
+       number of input and output pads of the filter.
+
+       A filter with no input pads is called a "source", and a filter with no
+       output pads is called a "sink".
+
+   Filtergraph syntax
+       A filtergraph has a textual representation, which is recognized by the
+       -filter/-vf/-af and -filter_complex options in ffmpeg and -vf/-af in
+       ffplay, and by the "avfilter_graph_parse_ptr()" function defined in
+       libavfilter/avfilter.h.
+
+       A filterchain consists of a sequence of connected filters, each one
+       connected to the previous one in the sequence. A filterchain is
+       represented by a list of ","-separated filter descriptions.
+
+       A filtergraph consists of a sequence of filterchains. A sequence of
+       filterchains is represented by a list of ";"-separated filterchain
+       descriptions.
+
+       A filter is represented by a string of the form:
+       [in_link_1]...[in_link_N]filter_name@id=arguments[out_link_1]...[out_link_M]
+
+       filter_name is the name of the filter class of which the described
+       filter is an instance of, and has to be the name of one of the filter
+       classes registered in the program optionally followed by "@id".	The
+       name of the filter class is optionally followed by a string
+       "=arguments".
+
+       arguments is a string which contains the parameters used to initialize
+       the filter instance. It may have one of two forms:
+
+       o   A ':'-separated list of key=value pairs.
+
+       o   A ':'-separated list of value. In this case, the keys are assumed
+	   to be the option names in the order they are declared. E.g. the
+	   "fade" filter declares three options in this order -- type,
+	   start_frame and nb_frames. Then the parameter list in:0:30 means
+	   that the value in is assigned to the option type, 0 to start_frame
+	   and 30 to nb_frames.
+
+       o   A ':'-separated list of mixed direct value and long key=value
+	   pairs. The direct value must precede the key=value pairs, and
+	   follow the same constraints order of the previous point. The
+	   following key=value pairs can be set in any preferred order.
+
+       If the option value itself is a list of items (e.g. the "format" filter
+       takes a list of pixel formats), the items in the list are usually
+       separated by |.
+
+       The list of arguments can be quoted using the character ' as initial
+       and ending mark, and the character \ for escaping the characters within
+       the quoted text; otherwise the argument string is considered terminated
+       when the next special character (belonging to the set []=;,) is
+       encountered.
+
+       A special syntax implemented in the ffmpeg CLI tool allows loading
+       option values from files. This is done be prepending a slash '/' to the
+       option name, then the supplied value is interpreted as a path from
+       which the actual value is loaded. E.g.
+
+	       ffmpeg -i <INPUT> -vf drawtext=/text=/tmp/some_text <OUTPUT>
+
+       will load the text to be drawn from /tmp/some_text. API users wishing
+       to implement a similar feature should use the
+       "avfilter_graph_segment_*()" functions together with custom IO code.
+
+       The name and arguments of the filter are optionally preceded and
+       followed by a list of link labels.  A link label allows one to name a
+       link and associate it to a filter output or input pad. The preceding
+       labels in_link_1 ... in_link_N, are associated to the filter input
+       pads, the following labels out_link_1 ... out_link_M, are associated to
+       the output pads.
+
+       When two link labels with the same name are found in the filtergraph, a
+       link between the corresponding input and output pad is created.
+
+       If an output pad is not labelled, it is linked by default to the first
+       unlabelled input pad of the next filter in the filterchain.  For
+       example in the filterchain
+
+	       nullsrc, split[L1], [L2]overlay, nullsink
+
+       the split filter instance has two output pads, and the overlay filter
+       instance two input pads. The first output pad of split is labelled
+       "L1", the first input pad of overlay is labelled "L2", and the second
+       output pad of split is linked to the second input pad of overlay, which
+       are both unlabelled.
+
+       In a filter description, if the input label of the first filter is not
+       specified, "in" is assumed; if the output label of the last filter is
+       not specified, "out" is assumed.
+
+       In a complete filterchain all the unlabelled filter input and output
+       pads must be connected. A filtergraph is considered valid if all the
+       filter input and output pads of all the filterchains are connected.
+
+       Leading and trailing whitespaces (space, tabs, or line feeds)
+       separating tokens in the filtergraph specification are ignored. This
+       means that the filtergraph can be expressed using empty lines and
+       spaces to improve redability.
+
+       For example, the filtergraph:
+
+	       testsrc,split[L1],hflip[L2];[L1][L2] hstack
+
+       can be represented as:
+
+	       testsrc,
+	       split [L1], hflip [L2];
+
+	       [L1][L2] hstack
+
+       Libavfilter will automatically insert scale filters where format
+       conversion is required. It is possible to specify swscale flags for
+       those automatically inserted scalers by prepending "sws_flags=flags;"
+       to the filtergraph description.
+
+       Here is a BNF description of the filtergraph syntax:
+
+	       <NAME>		  ::= sequence of alphanumeric characters and '_'
+	       <FILTER_NAME>	  ::= <NAME>["@"<NAME>]
+	       <LINKLABEL>	  ::= "[" <NAME> "]"
+	       <LINKLABELS>	  ::= <LINKLABEL> [<LINKLABELS>]
+	       <FILTER_ARGUMENTS> ::= sequence of chars (possibly quoted)
+	       <FILTER> 	  ::= [<LINKLABELS>] <FILTER_NAME> ["=" <FILTER_ARGUMENTS>] [<LINKLABELS>]
+	       <FILTERCHAIN>	  ::= <FILTER> [,<FILTERCHAIN>]
+	       <FILTERGRAPH>	  ::= [sws_flags=<flags>;] <FILTERCHAIN> [;<FILTERGRAPH>]
+
+   Notes on filtergraph escaping
+       Filtergraph description composition entails several levels of escaping.
+       See the "Quoting and escaping" section in the ffmpeg-utils(1) manual
+       for more information about the employed escaping procedure.
+
+       A first level escaping affects the content of each filter option value,
+       which may contain the special character ":" used to separate values, or
+       one of the escaping characters "\'".
+
+       A second level escaping affects the whole filter description, which may
+       contain the escaping characters "\'" or the special characters "[],;"
+       used by the filtergraph description.
+
+       Finally, when you specify a filtergraph on a shell commandline, you
+       need to perform a third level escaping for the shell special characters
+       contained within it.
+
+       For example, consider the following string to be embedded in the
+       drawtext filter description text value:
+
+	       this is a 'string': may contain one, or more, special characters
+
+       This string contains the "'" special escaping character, and the ":"
+       special character, so it needs to be escaped in this way:
+
+	       text=this is a \'string\'\: may contain one, or more, special characters
+
+       A second level of escaping is required when embedding the filter
+       description in a filtergraph description, in order to escape all the
+       filtergraph special characters. Thus the example above becomes:
+
+	       drawtext=text=this is a \\\'string\\\'\\: may contain one\, or more\, special characters
+
+       (note that in addition to the "\'" escaping special characters, also
+       "," needs to be escaped).
+
+       Finally an additional level of escaping is needed when writing the
+       filtergraph description in a shell command, which depends on the
+       escaping rules of the adopted shell. For example, assuming that "\" is
+       special and needs to be escaped with another "\", the previous string
+       will finally result in:
+
+	       -vf "drawtext=text=this is a \\\\\\'string\\\\\\'\\\\: may contain one\\, or more\\, special characters"
+
+       In order to avoid cumbersome escaping when using a commandline tool
+       accepting a filter specification as input, it is advisable to avoid
+       direct inclusion of the filter or options specification in the shell.
+
+       For example, in case of the drawtext filter, you might prefer to use
+       the textfile option in place of text to specify the text to render.
+
+TIMELINE EDITING
+       Some filters support a generic enable option. For the filters
+       supporting timeline editing, this option can be set to an expression
+       which is evaluated before sending a frame to the filter. If the
+       evaluation is non-zero, the filter will be enabled, otherwise the frame
+       will be sent unchanged to the next filter in the filtergraph.
+
+       The expression accepts the following values:
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       n   sequential number of the input frame, starting from 0
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       w
+       h   width and height of the input frame if video
+
+       Additionally, these filters support an enable command that can be used
+       to re-define the expression.
+
+       Like any other filtering option, the enable option follows the same
+       rules.
+
+       For example, to enable a blur filter (smartblur) from 10 seconds to 3
+       minutes, and a curves filter starting at 3 seconds:
+
+	       smartblur = enable='between(t,10,3*60)',
+	       curves	 = enable='gte(t,3)' : preset=cross_process
+
+       See "ffmpeg -filters" to view which filters have timeline support.
+
+CHANGING OPTIONS AT RUNTIME WITH A COMMAND
+       Some options can be changed during the operation of the filter using a
+       command. These options are marked 'T' on the output of ffmpeg -h
+       filter=<name of filter>.  The name of the command is the name of the
+       option and the argument is the new value.
+
+OPTIONS FOR FILTERS WITH SEVERAL INPUTS
+       Some filters with several inputs support a common set of options.
+       These options can only be set by name, not with the short notation.
+
+       eof_action
+	   The action to take when EOF is encountered on the secondary input;
+	   it accepts one of the following values:
+
+	   repeat
+	       Repeat the last frame (the default).
+
+	   endall
+	       End both streams.
+
+	   pass
+	       Pass the main input through.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+       repeatlast
+	   If set to 1, force the filter to extend the last frame of secondary
+	   streams until the end of the primary stream. A value of 0 disables
+	   this behavior.  Default value is 1.
+
+       ts_sync_mode
+	   How strictly to sync streams based on secondary input timestamps;
+	   it accepts one of the following values:
+
+	   default
+	       Frame from secondary input with the nearest lower or equal
+	       timestamp to the primary input frame.
+
+	   nearest
+	       Frame from secondary input with the absolute nearest timestamp
+	       to the primary input frame.
+
+AUDIO FILTERS
+       When you configure your FFmpeg build, you can disable any of the
+       existing filters using "--disable-filters".  The configure output will
+       show the audio filters included in your build.
+
+       Below is a description of the currently available audio filters.
+
+   aap
+       Apply Affine Projection algorithm to the first audio stream using the
+       second audio stream.
+
+       This adaptive filter is used to estimate unknown audio based on
+       multiple input audio samples.  Affine projection algorithm can make
+       trade-offs between computation complexity with convergence speed.
+
+       A description of the accepted options follows.
+
+       order
+	   Set the filter order.
+
+       projection
+	   Set the projection order.
+
+       mu  Set the filter mu.
+
+       delta
+	   Set the coefficient to initialize internal covariance matrix.
+
+       out_mode
+	   Set the filter output samples. It accepts the following values:
+
+	   i   Pass the 1st input.
+
+	   d   Pass the 2nd input.
+
+	   o   Pass difference between desired, 2nd input and error signal
+	       estimate.
+
+	   n   Pass difference between input, 1st input and error signal
+	       estimate.
+
+	   e   Pass error signal estimated samples.
+
+	       Default value is o.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+   acompressor
+       A compressor is mainly used to reduce the dynamic range of a signal.
+       Especially modern music is mostly compressed at a high ratio to improve
+       the overall loudness. It's done to get the highest attention of a
+       listener, "fatten" the sound and bring more "power" to the track.  If a
+       signal is compressed too much it may sound dull or "dead" afterwards or
+       it may start to "pump" (which could be a powerful effect but can also
+       destroy a track completely).  The right compression is the key to reach
+       a professional sound and is the high art of mixing and mastering.
+       Because of its complex settings it may take a long time to get the
+       right feeling for this kind of effect.
+
+       Compression is done by detecting the volume above a chosen level
+       "threshold" and dividing it by the factor set with "ratio".  So if you
+       set the threshold to -12dB and your signal reaches -6dB a ratio of 2:1
+       will result in a signal at -9dB. Because an exact manipulation of the
+       signal would cause distortion of the waveform the reduction can be
+       levelled over the time. This is done by setting "Attack" and "Release".
+       "attack" determines how long the signal has to rise above the threshold
+       before any reduction will occur and "release" sets the time the signal
+       has to fall below the threshold to reduce the reduction again. Shorter
+       signals than the chosen attack time will be left untouched.  The
+       overall reduction of the signal can be made up afterwards with the
+       "makeup" setting. So compressing the peaks of a signal about 6dB and
+       raising the makeup to this level results in a signal twice as loud than
+       the source. To gain a softer entry in the compression the "knee"
+       flattens the hard edge at the threshold in the range of the chosen
+       decibels.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. Default is 1. Range is between 0.015625 and 64.
+
+       mode
+	   Set mode of compressor operation. Can be "upward" or "downward".
+	   Default is "downward".
+
+       threshold
+	   If a signal of stream rises above this level it will affect the
+	   gain reduction.  By default it is 0.125. Range is between
+	   0.00097563 and 1.
+
+       ratio
+	   Set a ratio by which the signal is reduced. 1:2 means that if the
+	   level rose 4dB above the threshold, it will be only 2dB above after
+	   the reduction.  Default is 2. Range is between 1 and 20.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction starts. Default is 20. Range is between 0.01
+	   and 2000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before reduction is decreased again. Default is 250. Range is
+	   between 0.01 and 9000.
+
+       makeup
+	   Set the amount by how much signal will be amplified after
+	   processing.	Default is 1. Range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.82843. Range is between 1 and 8.
+
+       link
+	   Choose if the "average" level between all channels of input stream
+	   or the louder("maximum") channel of input stream affects the
+	   reduction. Default is "average".
+
+       detection
+	   Should the exact signal be taken in case of "peak" or an RMS one in
+	   case of "rms". Default is "rms" which is mostly smoother.
+
+       mix How much to use compressed signal in output. Default is 1.  Range
+	   is between 0 and 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   acontrast
+       Simple audio dynamic range compression/expansion filter.
+
+       The filter accepts the following options:
+
+       contrast
+	   Set contrast. Default is 33. Allowed range is between 0 and 100.
+
+   acopy
+       Copy the input audio source unchanged to the output. This is mainly
+       useful for testing purposes.
+
+   acrossfade
+       Apply cross fade from one input audio stream to another input audio
+       stream.	The cross fade is applied for specified duration near the end
+       of first stream.
+
+       The filter accepts the following options:
+
+       nb_samples, ns
+	   Specify the number of samples for which the cross fade effect has
+	   to last.  At the end of the cross fade effect the first input audio
+	   will be completely silent. Default is 44100.
+
+       duration, d
+	   Specify the duration of the cross fade effect. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  By default the duration is determined by nb_samples.  If
+	   set this option is used instead of nb_samples.
+
+       overlap, o
+	   Should first stream end overlap with second stream start. Default
+	   is enabled.
+
+       curve1
+	   Set curve for cross fade transition for first stream.
+
+       curve2
+	   Set curve for cross fade transition for second stream.
+
+	   For description of available curve types see afade filter
+	   description.
+
+       Examples
+
+       o   Cross fade from one input to another:
+
+		   ffmpeg -i first.flac -i second.flac -filter_complex acrossfade=d=10:c1=exp:c2=exp output.flac
+
+       o   Cross fade from one input to another but without overlapping:
+
+		   ffmpeg -i first.flac -i second.flac -filter_complex acrossfade=d=10:o=0:c1=exp:c2=exp output.flac
+
+   acrossover
+       Split audio stream into several bands.
+
+       This filter splits audio stream into two or more frequency ranges.
+       Summing all streams back will give flat output.
+
+       The filter accepts the following options:
+
+       split
+	   Set split frequencies. Those must be positive and increasing.
+
+       order
+	   Set filter order for each band split. This controls filter roll-off
+	   or steepness of filter transfer function.  Available values are:
+
+	   2nd 12 dB per octave.
+
+	   4th 24 dB per octave.
+
+	   6th 36 dB per octave.
+
+	   8th 48 dB per octave.
+
+	   10th
+	       60 dB per octave.
+
+	   12th
+	       72 dB per octave.
+
+	   14th
+	       84 dB per octave.
+
+	   16th
+	       96 dB per octave.
+
+	   18th
+	       108 dB per octave.
+
+	   20th
+	       120 dB per octave.
+
+	   Default is 4th.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 1. Default value
+	   is 1.
+
+       gains
+	   Set output gain for each band. Default value is 1 for all bands.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+	   Default value is "auto".
+
+       Examples
+
+       o   Split input audio stream into two bands (low and high) with split
+	   frequency of 1500 Hz, each band will be in separate stream:
+
+		   ffmpeg -i in.flac -filter_complex 'acrossover=split=1500[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
+
+       o   Same as above, but with higher filter order:
+
+		   ffmpeg -i in.flac -filter_complex 'acrossover=split=1500:order=8th[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
+
+       o   Same as above, but also with additional middle band (frequencies
+	   between 1500 and 8000):
+
+		   ffmpeg -i in.flac -filter_complex 'acrossover=split=1500 8000:order=8th[LOW][MID][HIGH]' -map '[LOW]' low.wav -map '[MID]' mid.wav -map '[HIGH]' high.wav
+
+   acrusher
+       Reduce audio bit resolution.
+
+       This filter is bit crusher with enhanced functionality. A bit crusher
+       is used to audibly reduce number of bits an audio signal is sampled
+       with. This doesn't change the bit depth at all, it just produces the
+       effect. Material reduced in bit depth sounds more harsh and "digital".
+       This filter is able to even round to continuous values instead of
+       discrete bit depths.  Additionally it has a D/C offset which results in
+       different crushing of the lower and the upper half of the signal.  An
+       Anti-Aliasing setting is able to produce "softer" crushing sounds.
+
+       Another feature of this filter is the logarithmic mode.	This setting
+       switches from linear distances between bits to logarithmic ones.  The
+       result is a much more "natural" sounding crusher which doesn't gate low
+       signals for example. The human ear has a logarithmic perception, so
+       this kind of crushing is much more pleasant.  Logarithmic crushing is
+       also able to get anti-aliased.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set level in.
+
+       level_out
+	   Set level out.
+
+       bits
+	   Set bit reduction.
+
+       mix Set mixing amount.
+
+       mode
+	   Can be linear: "lin" or logarithmic: "log".
+
+       dc  Set DC.
+
+       aa  Set anti-aliasing.
+
+       samples
+	   Set sample reduction.
+
+       lfo Enable LFO. By default disabled.
+
+       lforange
+	   Set LFO range.
+
+       lforate
+	   Set LFO rate.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   acue
+       Delay audio filtering until a given wallclock timestamp. See the cue
+       filter.
+
+   adeclick
+       Remove impulsive noise from input audio.
+
+       Samples detected as impulsive noise are replaced by interpolated
+       samples using autoregressive modelling.
+
+       window, w
+	   Set window size, in milliseconds. Allowed range is from 10 to 100.
+	   Default value is 55 milliseconds.  This sets size of window which
+	   will be processed at once.
+
+       overlap, o
+	   Set window overlap, in percentage of window size. Allowed range is
+	   from 50 to 95. Default value is 75 percent.	Setting this to a very
+	   high value increases impulsive noise removal but makes whole
+	   process much slower.
+
+       arorder, a
+	   Set autoregression order, in percentage of window size. Allowed
+	   range is from 0 to 25. Default value is 2 percent. This option also
+	   controls quality of interpolated samples using neighbour good
+	   samples.
+
+       threshold, t
+	   Set threshold value. Allowed range is from 1 to 100.  Default value
+	   is 2.  This controls the strength of impulsive noise which is going
+	   to be removed.  The lower value, the more samples will be detected
+	   as impulsive noise.
+
+       burst, b
+	   Set burst fusion, in percentage of window size. Allowed range is 0
+	   to 10. Default value is 2.  If any two samples detected as noise
+	   are spaced less than this value then any sample between those two
+	   samples will be also detected as noise.
+
+       method, m
+	   Set overlap method.
+
+	   It accepts the following values:
+
+	   add, a
+	       Select overlap-add method. Even not interpolated samples are
+	       slightly changed with this method.
+
+	   save, s
+	       Select overlap-save method. Not interpolated samples remain
+	       unchanged.
+
+	   Default value is "a".
+
+   adeclip
+       Remove clipped samples from input audio.
+
+       Samples detected as clipped are replaced by interpolated samples using
+       autoregressive modelling.
+
+       window, w
+	   Set window size, in milliseconds. Allowed range is from 10 to 100.
+	   Default value is 55 milliseconds.  This sets size of window which
+	   will be processed at once.
+
+       overlap, o
+	   Set window overlap, in percentage of window size. Allowed range is
+	   from 50 to 95. Default value is 75 percent.
+
+       arorder, a
+	   Set autoregression order, in percentage of window size. Allowed
+	   range is from 0 to 25. Default value is 8 percent. This option also
+	   controls quality of interpolated samples using neighbour good
+	   samples.
+
+       threshold, t
+	   Set threshold value. Allowed range is from 1 to 100.  Default value
+	   is 10. Higher values make clip detection less aggressive.
+
+       hsize, n
+	   Set size of histogram used to detect clips. Allowed range is from
+	   100 to 9999.  Default value is 1000. Higher values make clip
+	   detection less aggressive.
+
+       method, m
+	   Set overlap method.
+
+	   It accepts the following values:
+
+	   add, a
+	       Select overlap-add method. Even not interpolated samples are
+	       slightly changed with this method.
+
+	   save, s
+	       Select overlap-save method. Not interpolated samples remain
+	       unchanged.
+
+	   Default value is "a".
+
+   adecorrelate
+       Apply decorrelation to input audio stream.
+
+       The filter accepts the following options:
+
+       stages
+	   Set decorrelation stages of filtering. Allowed range is from 1 to
+	   16. Default value is 6.
+
+       seed
+	   Set random seed used for setting delay in samples across channels.
+
+   adelay
+       Delay one or more audio channels.
+
+       Samples in delayed channel are filled with silence.
+
+       The filter accepts the following option:
+
+       delays
+	   Set list of delays in milliseconds for each channel separated by
+	   '|'.  Unused delays will be silently ignored. If number of given
+	   delays is smaller than number of channels all remaining channels
+	   will not be delayed.  If you want to delay exact number of samples,
+	   append 'S' to number.  If you want instead to delay in seconds,
+	   append 's' to number.
+
+       all Use last set delay for all remaining channels. By default is
+	   disabled.  This option if enabled changes how option "delays" is
+	   interpreted.
+
+       Examples
+
+       o   Delay first channel by 1.5 seconds, the third channel by 0.5
+	   seconds and leave the second channel (and any other channels that
+	   may be present) unchanged.
+
+		   adelay=1500|0|500
+
+       o   Delay second channel by 500 samples, the third channel by 700
+	   samples and leave the first channel (and any other channels that
+	   may be present) unchanged.
+
+		   adelay=0|500S|700S
+
+       o   Delay all channels by same number of samples:
+
+		   adelay=delays=64S:all=1
+
+   adenorm
+       Remedy denormals in audio by adding extremely low-level noise.
+
+       This filter shall be placed before any filter that can produce
+       denormals.
+
+       A description of the accepted parameters follows.
+
+       level
+	   Set level of added noise in dB. Default is "-351".  Allowed range
+	   is from -451 to -90.
+
+       type
+	   Set type of added noise.
+
+	   dc  Add DC signal.
+
+	   ac  Add AC signal.
+
+	   square
+	       Add square signal.
+
+	   pulse
+	       Add pulse signal.
+
+	   Default is "dc".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aderivative, aintegral
+       Compute derivative/integral of audio stream.
+
+       Applying both filters one after another produces original audio.
+
+   adrc
+       Apply spectral dynamic range controller filter to input audio stream.
+
+       A description of the accepted options follows.
+
+       transfer
+	   Set the transfer expression.
+
+	   The expression can contain the following constants:
+
+	   ch  current channel number
+
+	   sn  current sample number
+
+	   nb_channels
+	       number of channels
+
+	   t   timestamp expressed in seconds
+
+	   sr  sample rate
+
+	   p   current frequency power value, in dB
+
+	   f   current frequency in Hz
+
+	   Default value is "p".
+
+       attack
+	   Set the attack in milliseconds. Default is 50 milliseconds.
+	   Allowed range is from 1 to 1000 milliseconds.
+
+       release
+	   Set the release in milliseconds. Default is 100 milliseconds.
+	   Allowed range is from 5 to 2000 milliseconds.
+
+       channels
+	   Set which channels to filter, by default "all" channels in audio
+	   stream are filtered.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Apply spectral compression to all frequencies with threshold of -50
+	   dB and 1:6 ratio:
+
+		   adrc=transfer='if(gt(p,-50),-50+(p-(-50))/6,p)':attack=50:release=100
+
+       o   Similar to above but with 1:2 ratio and filtering only front center
+	   channel:
+
+		   adrc=transfer='if(gt(p,-50),-50+(p-(-50))/2,p)':attack=50:release=100:channels=FC
+
+       o   Apply spectral noise gate to all frequencies with threshold of -85
+	   dB and with short attack time and short release time:
+
+		   adrc=transfer='if(lte(p,-85),p-800,p)':attack=1:release=5
+
+       o   Apply spectral expansion to all frequencies with threshold of -10
+	   dB and 1:2 ratio:
+
+		   adrc=transfer='if(lt(p,-10),-10+(p-(-10))*2,p)':attack=50:release=100
+
+       o   Apply limiter to max -60 dB to all frequencies, with attack of 2 ms
+	   and release of 10 ms:
+
+		   adrc=transfer='min(p,-60)':attack=2:release=10
+
+   adynamicequalizer
+       Apply dynamic equalization to input audio stream.
+
+       A description of the accepted options follows.
+
+       threshold
+	   Set the detection threshold used to trigger equalization.
+	   Threshold detection is using detection filter.  Default value is 0.
+	   Allowed range is from 0 to 100.
+
+       dfrequency
+	   Set the detection frequency in Hz used for detection filter used to
+	   trigger equalization.  Default value is 1000 Hz. Allowed range is
+	   between 2 and 1000000 Hz.
+
+       dqfactor
+	   Set the detection resonance factor for detection filter used to
+	   trigger equalization.  Default value is 1. Allowed range is from
+	   0.001 to 1000.
+
+       tfrequency
+	   Set the target frequency of equalization filter.  Default value is
+	   1000 Hz. Allowed range is between 2 and 1000000 Hz.
+
+       tqfactor
+	   Set the target resonance factor for target equalization filter.
+	   Default value is 1. Allowed range is from 0.001 to 1000.
+
+       attack
+	   Set the amount of milliseconds the signal from detection has to
+	   rise above the detection threshold before equalization starts.
+	   Default is 20. Allowed range is between 1 and 2000.
+
+       release
+	   Set the amount of milliseconds the signal from detection has to
+	   fall below the detection threshold before equalization ends.
+	   Default is 200. Allowed range is between 1 and 2000.
+
+       ratio
+	   Set the ratio by which the equalization gain is raised.  Default is
+	   1. Allowed range is between 0 and 30.
+
+       makeup
+	   Set the makeup offset by which the equalization gain is raised.
+	   Default is 0. Allowed range is between 0 and 100.
+
+       range
+	   Set the max allowed cut/boost amount. Default is 50.  Allowed range
+	   is from 1 to 200.
+
+       mode
+	   Set the mode of filter operation, can be one of the following:
+
+	   listen
+	       Output only isolated detection signal.
+
+	   cutbelow
+	       Cut frequencies below detection threshold.
+
+	   cutabove
+	       Cut frequencies above detection threshold.
+
+	   boostbelow
+	       Boost frequencies below detection threshold.
+
+	   boostabove
+	       Boost frequencies above detection threshold.
+
+	   Default mode is cutbelow.
+
+       dftype
+	   Set the type of detection filter, can be one of the following:
+
+	   bandpass
+	   lowpass
+	   highpass
+	   peak
+
+	   Default type is bandpass.
+
+       tftype
+	   Set the type of target filter, can be one of the following:
+
+	   bell
+	   lowshelf
+	   highshelf
+
+	   Default type is bell.
+
+       auto
+	   Automatically gather threshold from detection filter. By default is
+	   disabled.  This option is useful to detect threshold in certain
+	   time frame of input audio stream, in such case option value is
+	   changed at runtime.
+
+	   Available values are:
+
+	   disabled
+	       Disable using automatically gathered threshold value.
+
+	   off Stop picking threshold value.
+
+	   on  Start picking threshold value.
+
+	   adaptive
+	       Adaptively pick threshold value, by calculating sliding window
+	       entropy.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   adynamicsmooth
+       Apply dynamic smoothing to input audio stream.
+
+       A description of the accepted options follows.
+
+       sensitivity
+	   Set an amount of sensitivity to frequency fluctations. Default is
+	   2.  Allowed range is from 0 to 1e+06.
+
+       basefreq
+	   Set a base frequency for smoothing. Default value is 22050.
+	   Allowed range is from 2 to 1e+06.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aecho
+       Apply echoing to the input audio.
+
+       Echoes are reflected sound and can occur naturally amongst mountains
+       (and sometimes large buildings) when talking or shouting; digital echo
+       effects emulate this behaviour and are often used to help fill out the
+       sound of a single instrument or vocal. The time difference between the
+       original signal and the reflection is the "delay", and the loudness of
+       the reflected signal is the "decay".  Multiple echoes can have
+       different delays and decays.
+
+       A description of the accepted parameters follows.
+
+       in_gain
+	   Set input gain of reflected signal. Default is 0.6.
+
+       out_gain
+	   Set output gain of reflected signal. Default is 0.3.
+
+       delays
+	   Set list of time intervals in milliseconds between original signal
+	   and reflections separated by '|'. Allowed range for each "delay" is
+	   "(0 - 90000.0]".  Default is 1000.
+
+       decays
+	   Set list of loudness of reflected signals separated by '|'.
+	   Allowed range for each "decay" is "(0 - 1.0]".  Default is 0.5.
+
+       Examples
+
+       o   Make it sound as if there are twice as many instruments as are
+	   actually playing:
+
+		   aecho=0.8:0.88:60:0.4
+
+       o   If delay is very short, then it sounds like a (metallic) robot
+	   playing music:
+
+		   aecho=0.8:0.88:6:0.4
+
+       o   A longer delay will sound like an open air concert in the
+	   mountains:
+
+		   aecho=0.8:0.9:1000:0.3
+
+       o   Same as above but with one more mountain:
+
+		   aecho=0.8:0.9:1000|1800:0.3|0.25
+
+   aemphasis
+       Audio emphasis filter creates or restores material directly taken from
+       LPs or emphased CDs with different filter curves. E.g. to store music
+       on vinyl the signal has to be altered by a filter first to even out the
+       disadvantages of this recording medium.	Once the material is played
+       back the inverse filter has to be applied to restore the distortion of
+       the frequency response.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain.
+
+       level_out
+	   Set output gain.
+
+       mode
+	   Set filter mode. For restoring material use "reproduction" mode,
+	   otherwise use "production" mode. Default is "reproduction" mode.
+
+       type
+	   Set filter type. Selects medium. Can be one of the following:
+
+	   col select Columbia.
+
+	   emi select EMI.
+
+	   bsi select BSI (78RPM).
+
+	   riaa
+	       select RIAA.
+
+	   cd  select Compact Disc (CD).
+
+	   50fm
+	       select 50Xs (FM).
+
+	   75fm
+	       select 75Xs (FM).
+
+	   50kf
+	       select 50Xs (FM-KF).
+
+	   75kf
+	       select 75Xs (FM-KF).
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aeval
+       Modify an audio signal according to the specified expressions.
+
+       This filter accepts one or more expressions (one for each channel),
+       which are evaluated and used to modify a corresponding audio signal.
+
+       It accepts the following parameters:
+
+       exprs
+	   Set the '|'-separated expressions list for each separate channel.
+	   If the number of input channels is greater than the number of
+	   expressions, the last specified expression is used for the
+	   remaining output channels.
+
+       channel_layout, c
+	   Set output channel layout. If not specified, the channel layout is
+	   specified by the number of expressions. If set to same, it will use
+	   by default the same input channel layout.
+
+       Each expression in exprs can contain the following constants and
+       functions:
+
+       ch  channel number of the current expression
+
+       n   number of the evaluated sample, starting from 0
+
+       s   sample rate
+
+       t   time of the evaluated sample expressed in seconds
+
+       nb_in_channels
+       nb_out_channels
+	   input and output number of channels
+
+       val(CH)
+	   the value of input channel with number CH
+
+       Note: this filter is slow. For faster processing you should use a
+       dedicated filter.
+
+       Examples
+
+       o   Half volume:
+
+		   aeval=val(ch)/2:c=same
+
+       o   Invert phase of the second channel:
+
+		   aeval=val(0)|-val(1)
+
+   aexciter
+       An exciter is used to produce high sound that is not present in the
+       original signal. This is done by creating harmonic distortions of the
+       signal which are restricted in range and added to the original signal.
+       An Exciter raises the upper end of an audio signal without simply
+       raising the higher frequencies like an equalizer would do to create a
+       more "crisp" or "brilliant" sound.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level prior processing of signal.	Allowed range is from
+	   0 to 64.  Default value is 1.
+
+       level_out
+	   Set output level after processing of signal.  Allowed range is from
+	   0 to 64.  Default value is 1.
+
+       amount
+	   Set the amount of harmonics added to original signal.  Allowed
+	   range is from 0 to 64.  Default value is 1.
+
+       drive
+	   Set the amount of newly created harmonics.  Allowed range is from
+	   0.1 to 10.  Default value is 8.5.
+
+       blend
+	   Set the octave of newly created harmonics.  Allowed range is from
+	   -10 to 10.  Default value is 0.
+
+       freq
+	   Set the lower frequency limit of producing harmonics in Hz.
+	   Allowed range is from 2000 to 12000 Hz.  Default is 7500 Hz.
+
+       ceil
+	   Set the upper frequency limit of producing harmonics.  Allowed
+	   range is from 9999 to 20000 Hz.  If value is lower than 10000 Hz no
+	   limit is applied.
+
+       listen
+	   Mute the original signal and output only added harmonics.  By
+	   default is disabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   afade
+       Apply fade-in/out effect to input audio.
+
+       A description of the accepted parameters follows.
+
+       type, t
+	   Specify the effect type, can be either "in" for fade-in, or "out"
+	   for a fade-out effect. Default is "in".
+
+       start_sample, ss
+	   Specify the number of the start sample for starting to apply the
+	   fade effect. Default is 0.
+
+       nb_samples, ns
+	   Specify the number of samples for which the fade effect has to
+	   last. At the end of the fade-in effect the output audio will have
+	   the same volume as the input audio, at the end of the fade-out
+	   transition the output audio will be silence. Default is 44100.
+
+       start_time, st
+	   Specify the start time of the fade effect. Default is 0.  The value
+	   must be specified as a time duration; see the Time duration section
+	   in the ffmpeg-utils(1) manual for the accepted syntax.  If set this
+	   option is used instead of start_sample.
+
+       duration, d
+	   Specify the duration of the fade effect. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.  At
+	   the end of the fade-in effect the output audio will have the same
+	   volume as the input audio, at the end of the fade-out transition
+	   the output audio will be silence.  By default the duration is
+	   determined by nb_samples.  If set this option is used instead of
+	   nb_samples.
+
+       curve
+	   Set curve for fade transition.
+
+	   It accepts the following values:
+
+	   tri select triangular, linear slope (default)
+
+	   qsin
+	       select quarter of sine wave
+
+	   hsin
+	       select half of sine wave
+
+	   esin
+	       select exponential sine wave
+
+	   log select logarithmic
+
+	   ipar
+	       select inverted parabola
+
+	   qua select quadratic
+
+	   cub select cubic
+
+	   squ select square root
+
+	   cbr select cubic root
+
+	   par select parabola
+
+	   exp select exponential
+
+	   iqsin
+	       select inverted quarter of sine wave
+
+	   ihsin
+	       select inverted half of sine wave
+
+	   dese
+	       select double-exponential seat
+
+	   desi
+	       select double-exponential sigmoid
+
+	   losi
+	       select logistic sigmoid
+
+	   sinc
+	       select sine cardinal function
+
+	   isinc
+	       select inverted sine cardinal function
+
+	   quat
+	       select quartic
+
+	   quatr
+	       select quartic root
+
+	   qsin2
+	       select squared quarter of sine wave
+
+	   hsin2
+	       select squared half of sine wave
+
+	   nofade
+	       no fade applied
+
+       silence
+	   Set the initial gain for fade-in or final gain for fade-out.
+	   Default value is 0.0.
+
+       unity
+	   Set the initial gain for fade-out or final gain for fade-in.
+	   Default value is 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Fade in first 15 seconds of audio:
+
+		   afade=t=in:ss=0:d=15
+
+       o   Fade out last 25 seconds of a 900 seconds audio:
+
+		   afade=t=out:st=875:d=25
+
+   afftdn
+       Denoise audio samples with FFT.
+
+       A description of the accepted parameters follows.
+
+       noise_reduction, nr
+	   Set the noise reduction in dB, allowed range is 0.01 to 97.
+	   Default value is 12 dB.
+
+       noise_floor, nf
+	   Set the noise floor in dB, allowed range is -80 to -20.  Default
+	   value is -50 dB.
+
+       noise_type, nt
+	   Set the noise type.
+
+	   It accepts the following values:
+
+	   white, w
+	       Select white noise.
+
+	   vinyl, v
+	       Select vinyl noise.
+
+	   shellac, s
+	       Select shellac noise.
+
+	   custom, c
+	       Select custom noise, defined in "bn" option.
+
+	       Default value is white noise.
+
+       band_noise, bn
+	   Set custom band noise profile for every one of 15 bands.  Bands are
+	   separated by ' ' or '|'.
+
+       residual_floor, rf
+	   Set the residual floor in dB, allowed range is -80 to -20.  Default
+	   value is -38 dB.
+
+       track_noise, tn
+	   Enable noise floor tracking. By default is disabled.  With this
+	   enabled, noise floor is automatically adjusted.
+
+       track_residual, tr
+	   Enable residual tracking. By default is disabled.
+
+       output_mode, om
+	   Set the output mode.
+
+	   It accepts the following values:
+
+	   input, i
+	       Pass input unchanged.
+
+	   output, o
+	       Pass noise filtered out.
+
+	   noise, n
+	       Pass only noise.
+
+	       Default value is output.
+
+       adaptivity, ad
+	   Set the adaptivity factor, used how fast to adapt gains adjustments
+	   per each frequency bin. Value 0 enables instant adaptation, while
+	   higher values react much slower.  Allowed range is from 0 to 1.
+	   Default value is 0.5.
+
+       floor_offset, fo
+	   Set the noise floor offset factor. This option is used to adjust
+	   offset applied to measured noise floor. It is only effective when
+	   noise floor tracking is enabled.  Allowed range is from -2.0 to
+	   2.0. Default value is 1.0.
+
+       noise_link, nl
+	   Set the noise link used for multichannel audio.
+
+	   It accepts the following values:
+
+	   none
+	       Use unchanged channel's noise floor.
+
+	   min Use measured min noise floor of all channels.
+
+	   max Use measured max noise floor of all channels.
+
+	   average
+	       Use measured average noise floor of all channels.
+
+	       Default value is min.
+
+       band_multiplier, bm
+	   Set the band multiplier factor, used how much to spread bands
+	   across frequency bins.  Allowed range is from 0.2 to 5. Default
+	   value is 1.25.
+
+       sample_noise, sn
+	   Toggle capturing and measurement of noise profile from input audio.
+
+	   It accepts the following values:
+
+	   start, begin
+	       Start sample noise capture.
+
+	   stop, end
+	       Stop sample noise capture and measure new noise band profile.
+
+	       Default value is "none".
+
+       gain_smooth, gs
+	   Set gain smooth spatial radius, used to smooth gains applied to
+	   each frequency bin.	Useful to reduce random music noise artefacts.
+	   Higher values increases smoothing of gains.	Allowed range is from
+	   0 to 50.  Default value is 0.
+
+       Commands
+
+       This filter supports the some above mentioned options as commands.
+
+       Examples
+
+       o   Reduce white noise by 10dB, and use previously measured noise floor
+	   of -40dB:
+
+		   afftdn=nr=10:nf=-40
+
+       o   Reduce white noise by 10dB, also set initial noise floor to -80dB
+	   and enable automatic tracking of noise floor so noise floor will
+	   gradually change during processing:
+
+		   afftdn=nr=10:nf=-80:tn=1
+
+       o   Reduce noise by 20dB, using noise floor of -40dB and using commands
+	   to take noise profile of first 0.4 seconds of input audio:
+
+		   asendcmd=0.0 afftdn sn start,asendcmd=0.4 afftdn sn stop,afftdn=nr=20:nf=-40
+
+   afftfilt
+       Apply arbitrary expressions to samples in frequency domain.
+
+       real
+	   Set frequency domain real expression for each separate channel
+	   separated by '|'. Default is "re".  If the number of input channels
+	   is greater than the number of expressions, the last specified
+	   expression is used for the remaining output channels.
+
+       imag
+	   Set frequency domain imaginary expression for each separate channel
+	   separated by '|'. Default is "im".
+
+	   Each expression in real and imag can contain the following
+	   constants and functions:
+
+	   sr  sample rate
+
+	   b   current frequency bin number
+
+	   nb  number of available bins
+
+	   ch  channel number of the current expression
+
+	   chs number of channels
+
+	   pts current frame pts
+
+	   re  current real part of frequency bin of current channel
+
+	   im  current imaginary part of frequency bin of current channel
+
+	   real(b, ch)
+	       Return the value of real part of frequency bin at location
+	       (bin,channel)
+
+	   imag(b, ch)
+	       Return the value of imaginary part of frequency bin at location
+	       (bin,channel)
+
+       win_size
+	   Set window size. Allowed range is from 16 to 131072.  Default is
+	   4096
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann, hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hann".
+
+       overlap
+	   Set window overlap. If set to 1, the recommended overlap for
+	   selected window function will be picked. Default is 0.75.
+
+       Examples
+
+       o   Leave almost only low frequencies in audio:
+
+		   afftfilt="'real=re * (1-clip((b/nb)*b,0,1))':imag='im * (1-clip((b/nb)*b,0,1))'"
+
+       o   Apply robotize effect:
+
+		   afftfilt="real='hypot(re,im)*sin(0)':imag='hypot(re,im)*cos(0)':win_size=512:overlap=0.75"
+
+       o   Apply whisper effect:
+
+		   afftfilt="real='hypot(re,im)*cos((random(0)*2-1)*2*3.14)':imag='hypot(re,im)*sin((random(1)*2-1)*2*3.14)':win_size=128:overlap=0.8"
+
+       o   Apply phase shift:
+
+		   afftfilt="real=re*cos(1)-im*sin(1):imag=re*sin(1)+im*cos(1)"
+
+   afir
+       Apply an arbitrary Finite Impulse Response filter.
+
+       This filter is designed for applying long FIR filters, up to 60 seconds
+       long.
+
+       It can be used as component for digital crossover filters, room
+       equalization, cross talk cancellation, wavefield synthesis,
+       auralization, ambiophonics, ambisonics and spatialization.
+
+       This filter uses the streams higher than first one as FIR coefficients.
+       If the non-first stream holds a single channel, it will be used for all
+       input channels in the first stream, otherwise the number of channels in
+       the non-first stream must be same as the number of channels in the
+       first stream.
+
+       It accepts the following parameters:
+
+       dry Set dry gain. This sets input gain.
+
+       wet Set wet gain. This sets final output gain.
+
+       length
+	   Set Impulse Response filter length. Default is 1, which means whole
+	   IR is processed.
+
+       gtype
+	   This option is deprecated, and does nothing.
+
+       irnorm
+	   Set norm to be applied to IR coefficients before filtering.
+	   Allowed range is from -1 to 2.  IR coefficients are normalized with
+	   calculated vector norm set by this option.  For negative values, no
+	   norm is calculated, and IR coefficients are not modified at all.
+	   Default is 1.
+
+       irlink
+	   For multichannel IR if this option is set to true, all IR channels
+	   will be normalized with maximal measured gain of all IR channels
+	   coefficients as set by "irnorm" option.  When disabled, all IR
+	   coefficients in each IR channel will be normalized independently.
+	   Default is true.
+
+       irgain
+	   Set gain to be applied to IR coefficients before filtering.
+	   Allowed range is 0 to 1. This gain is applied after any gain
+	   applied with irnorm option.
+
+       irfmt
+	   Set format of IR stream. Can be "mono" or "input".  Default is
+	   "input".
+
+       maxir
+	   Set max allowed Impulse Response filter duration in seconds.
+	   Default is 30 seconds.  Allowed range is 0.1 to 60 seconds.
+
+       response
+	   This option is deprecated, and does nothing.
+
+       channel
+	   This option is deprecated, and does nothing.
+
+       size
+	   This option is deprecated, and does nothing.
+
+       rate
+	   This option is deprecated, and does nothing.
+
+       minp
+	   Set minimal partition size used for convolution. Default is 8192.
+	   Allowed range is from 1 to 65536.  Lower values decreases latency
+	   at cost of higher CPU usage.
+
+       maxp
+	   Set maximal partition size used for convolution. Default is 8192.
+	   Allowed range is from 8 to 65536.  Lower values may increase CPU
+	   usage.
+
+       nbirs
+	   Set number of input impulse responses streams which will be
+	   switchable at runtime.  Allowed range is from 1 to 32. Default is
+	   1.
+
+       ir  Set IR stream which will be used for convolution, starting from 0,
+	   should always be lower than supplied value by "nbirs" option.
+	   Default is 0.  This option can be changed at runtime via commands.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+	   Default value is auto.
+
+       irload
+	   Set when to load IR stream. Can be "init" or "access".  First one
+	   load and prepares all IRs on initialization, second one once on
+	   first access of specific IR.  Default is "init".
+
+       Examples
+
+       o   Apply reverb to stream using mono IR file as second input, complete
+	   command using ffmpeg:
+
+		   ffmpeg -i input.wav -i middle_tunnel_1way_mono.wav -lavfi afir output.wav
+
+       o   Apply true stereo processing given input stereo stream, and two
+	   stereo impulse responses for left and right channel, the impulse
+	   response files are files with names l_ir.wav and r_ir.wav, and
+	   setting irnorm option value:
+
+		   "pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irnorm=1.2,pan=stereo|FL<c0+c2|FR<c1+c3"
+
+       o   Similar to above example, but with "irgain" explicitly set to
+	   estimated value and with "irnorm" disabled:
+
+		   "pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irgain=-5dB:irnom=-1,pan=stereo|FL<c0+c2|FR<c1+c3"
+
+   aformat
+       Set output format constraints for the input audio. The framework will
+       negotiate the most appropriate format to minimize conversions.
+
+       It accepts the following parameters:
+
+       sample_fmts, f
+	   A '|'-separated list of requested sample formats.
+
+       sample_rates, r
+	   A '|'-separated list of requested sample rates.
+
+       channel_layouts, cl
+	   A '|'-separated list of requested channel layouts.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       If a parameter is omitted, all values are allowed.
+
+       Force the output to either unsigned 8-bit or signed 16-bit stereo
+
+	       aformat=sample_fmts=u8|s16:channel_layouts=stereo
+
+   afreqshift
+       Apply frequency shift to input audio samples.
+
+       The filter accepts the following options:
+
+       shift
+	   Specify frequency shift. Allowed range is -INT_MAX to INT_MAX.
+	   Default value is 0.0.
+
+       level
+	   Set output gain applied to final output. Allowed range is from 0.0
+	   to 1.0.  Default value is 1.0.
+
+       order
+	   Set filter order used for filtering. Allowed range is from 1 to 16.
+	   Default value is 8.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   afwtdn
+       Reduce broadband noise from input samples using Wavelets.
+
+       A description of the accepted options follows.
+
+       sigma
+	   Set the noise sigma, allowed range is from 0 to 1.  Default value
+	   is 0.  This option controls strength of denoising applied to input
+	   samples.  Most useful way to set this option is via decibels, eg.
+	   -45dB.
+
+       levels
+	   Set the number of wavelet levels of decomposition.  Allowed range
+	   is from 1 to 12.  Default value is 10.  Setting this too low make
+	   denoising performance very poor.
+
+       wavet
+	   Set wavelet type for decomposition of input frame.  They are sorted
+	   by number of coefficients, from lowest to highest.  More
+	   coefficients means worse filtering speed, but overall better
+	   quality.  Available wavelets are:
+
+	   sym2
+	   sym4
+	   rbior68
+	   deb10
+	   sym10
+	   coif5
+	   bl3
+       percent
+	   Set percent of full denoising. Allowed range is from 0 to 100
+	   percent.  Default value is 85 percent or partial denoising.
+
+       profile
+	   If enabled, first input frame will be used as noise profile.  If
+	   first frame samples contain non-noise performance will be very
+	   poor.
+
+       adaptive
+	   If enabled, input frames are analyzed for presence of noise.  If
+	   noise is detected with high possibility then input frame profile
+	   will be used for processing following frames, until new noise frame
+	   is detected.
+
+       samples
+	   Set size of single frame in number of samples. Allowed range is
+	   from 512 to 65536. Default frame size is 8192 samples.
+
+       softness
+	   Set softness applied inside thresholding function. Allowed range is
+	   from 0 to 10. Default softness is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   agate
+       A gate is mainly used to reduce lower parts of a signal. This kind of
+       signal processing reduces disturbing noise between useful signals.
+
+       Gating is done by detecting the volume below a chosen level threshold
+       and dividing it by the factor set with ratio. The bottom of the noise
+       floor is set via range. Because an exact manipulation of the signal
+       would cause distortion of the waveform the reduction can be levelled
+       over time. This is done by setting attack and release.
+
+       attack determines how long the signal has to fall below the threshold
+       before any reduction will occur and release sets the time the signal
+       has to rise above the threshold to reduce the reduction again.  Shorter
+       signals than the chosen attack time will be left untouched.
+
+       level_in
+	   Set input level before filtering.  Default is 1. Allowed range is
+	   from 0.015625 to 64.
+
+       mode
+	   Set the mode of operation. Can be "upward" or "downward".  Default
+	   is "downward". If set to "upward" mode, higher parts of signal will
+	   be amplified, expanding dynamic range in upward direction.
+	   Otherwise, in case of "downward" lower parts of signal will be
+	   reduced.
+
+       range
+	   Set the level of gain reduction when the signal is below the
+	   threshold.  Default is 0.06125. Allowed range is from 0 to 1.
+	   Setting this to 0 disables reduction and then filter behaves like
+	   expander.
+
+       threshold
+	   If a signal rises above this level the gain reduction is released.
+	   Default is 0.125. Allowed range is from 0 to 1.
+
+       ratio
+	   Set a ratio by which the signal is reduced.	Default is 2. Allowed
+	   range is from 1 to 9000.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction stops.  Default is 20 milliseconds. Allowed
+	   range is from 0.01 to 9000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before the reduction is increased again. Default is 250
+	   milliseconds.  Allowed range is from 0.01 to 9000.
+
+       makeup
+	   Set amount of amplification of signal after processing.  Default is
+	   1. Allowed range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.828427125. Allowed range is from 1 to 8.
+
+       detection
+	   Choose if exact signal should be taken for detection or an RMS like
+	   one.  Default is "rms". Can be "peak" or "rms".
+
+       link
+	   Choose if the average level between all channels or the louder
+	   channel affects the reduction.  Default is "average". Can be
+	   "average" or "maximum".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aiir
+       Apply an arbitrary Infinite Impulse Response filter.
+
+       It accepts the following parameters:
+
+       zeros, z
+	   Set B/numerator/zeros/reflection coefficients.
+
+       poles, p
+	   Set A/denominator/poles/ladder coefficients.
+
+       gains, k
+	   Set channels gains.
+
+       dry_gain
+	   Set input gain.
+
+       wet_gain
+	   Set output gain.
+
+       format, f
+	   Set coefficients format.
+
+	   ll  lattice-ladder function
+
+	   sf  analog transfer function
+
+	   tf  digital transfer function
+
+	   zp  Z-plane zeros/poles, cartesian (default)
+
+	   pr  Z-plane zeros/poles, polar radians
+
+	   pd  Z-plane zeros/poles, polar degrees
+
+	   sp  S-plane zeros/poles
+
+       process, r
+	   Set type of processing.
+
+	   d   direct processing
+
+	   s   serial processing
+
+	   p   parallel processing
+
+       precision, e
+	   Set filtering precision.
+
+	   dbl double-precision floating-point (default)
+
+	   flt single-precision floating-point
+
+	   i32 32-bit integers
+
+	   i16 16-bit integers
+
+       normalize, n
+	   Normalize filter coefficients, by default is enabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       mix How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       response
+	   Show IR frequency response, magnitude(magenta), phase(green) and
+	   group delay(yellow) in additional video stream.  By default it is
+	   disabled.
+
+       channel
+	   Set for which IR channel to display frequency response. By default
+	   is first channel displayed. This option is used only when response
+	   is enabled.
+
+       size
+	   Set video stream size. This option is used only when response is
+	   enabled.
+
+       Coefficients in "tf" and "sf" format are separated by spaces and are in
+       ascending order.
+
+       Coefficients in "zp" format are separated by spaces and order of
+       coefficients doesn't matter. Coefficients in "zp" format are complex
+       numbers with i imaginary unit.
+
+       Different coefficients and gains can be provided for every channel, in
+       such case use '|' to separate coefficients or gains. Last provided
+       coefficients will be used for all remaining channels.
+
+       Examples
+
+       o   Apply 2 pole elliptic notch at around 5000Hz for 48000 Hz sample
+	   rate:
+
+		   aiir=k=1:z=7.957584807809675810E-1 -2.575128568908332300 3.674839853930788710 -2.57512875289799137 7.957586296317130880E-1:p=1 -2.86950072432325953 3.63022088054647218 -2.28075678147272232 6.361362326477423500E-1:f=tf:r=d
+
+       o   Same as above but in "zp" format:
+
+		   aiir=k=0.79575848078096756:z=0.80918701+0.58773007i 0.80918701-0.58773007i 0.80884700+0.58784055i 0.80884700-0.58784055i:p=0.63892345+0.59951235i 0.63892345-0.59951235i 0.79582691+0.44198673i 0.79582691-0.44198673i:f=zp:r=s
+
+       o   Apply 3-rd order analog normalized Butterworth low-pass filter,
+	   using analog transfer function format:
+
+		   aiir=z=1.3057 0 0 0:p=1.3057 2.3892 2.1860 1:f=sf:r=d
+
+   alimiter
+       The limiter prevents an input signal from rising over a desired
+       threshold.  This limiter uses lookahead technology to prevent your
+       signal from distorting.	It means that there is a small delay after the
+       signal is processed. Keep in mind that the delay it produces is the
+       attack time you set.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. Default is 1.
+
+       level_out
+	   Set output gain. Default is 1.
+
+       limit
+	   Don't let signals above this level pass the limiter. Default is 1.
+
+       attack
+	   The limiter will reach its attenuation level in this amount of time
+	   in milliseconds. Default is 5 milliseconds.
+
+       release
+	   Come back from limiting to attenuation 1.0 in this amount of
+	   milliseconds.  Default is 50 milliseconds.
+
+       asc When gain reduction is always needed ASC takes care of releasing to
+	   an average reduction level rather than reaching a reduction of 0 in
+	   the release time.
+
+       asc_level
+	   Select how much the release time is affected by ASC, 0 means nearly
+	   no changes in release time while 1 produces higher release times.
+
+       level
+	   Auto level output signal. Default is enabled.  This normalizes
+	   audio back to 0dB if enabled.
+
+       latency
+	   Compensate the delay introduced by using the lookahead buffer set
+	   with attack parameter. Also flush the valid audio data in the
+	   lookahead buffer when the stream hits EOF.
+
+       Depending on picked setting it is recommended to upsample input 2x or
+       4x times with aresample before applying this filter.
+
+   allpass
+       Apply a two-pole all-pass filter with central frequency (in Hz)
+       frequency, and filter-width width.  An all-pass filter changes the
+       audio's frequency to phase relationship without changing its frequency
+       to amplitude relationship.
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set frequency in Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       order, o
+	   Set the filter order, can be 1 or 2. Default is 2.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change allpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change allpass width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change allpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change allpass mix.	Syntax for the command is : "mix"
+
+   aloop
+       Loop audio samples.
+
+       The filter accepts the following options:
+
+       loop
+	   Set the number of loops. Setting this value to -1 will result in
+	   infinite loops.  Default is 0.
+
+       size
+	   Set maximal number of samples. Default is 0.
+
+       start
+	   Set first sample of loop. Default is 0.
+
+       time
+	   Set the time of loop start in seconds.  Only used if option named
+	   start is set to "-1".
+
+   amerge
+       Merge two or more audio streams into a single multi-channel stream.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set the number of inputs. Default is 2.
+
+       If the channel layouts of the inputs are disjoint, and therefore
+       compatible, the channel layout of the output will be set accordingly
+       and the channels will be reordered as necessary. If the channel layouts
+       of the inputs are not disjoint, the output will have all the channels
+       of the first input then all the channels of the second input, in that
+       order, and the channel layout of the output will be the default value
+       corresponding to the total number of channels.
+
+       For example, if the first input is in 2.1 (FL+FR+LF) and the second
+       input is FC+BL+BR, then the output will be in 5.1, with the channels in
+       the following order: a1, a2, b1, a3, b2, b3 (a1 is the first channel of
+       the first input, b1 is the first channel of the second input).
+
+       On the other hand, if both input are in stereo, the output channels
+       will be in the default order: a1, a2, b1, b2, and the channel layout
+       will be arbitrarily set to 4.0, which may or may not be the expected
+       value.
+
+       All inputs must have the same sample rate, and format.
+
+       If inputs do not have the same duration, the output will stop with the
+       shortest.
+
+       Examples
+
+       o   Merge two mono files into a stereo stream:
+
+		   amovie=left.wav [l] ; amovie=right.mp3 [r] ; [l] [r] amerge
+
+       o   Multiple merges assuming 1 video stream and 6 audio streams in
+	   input.mkv:
+
+		   ffmpeg -i input.mkv -filter_complex "[0:1][0:2][0:3][0:4][0:5][0:6] amerge=inputs=6" -c:a pcm_s16le output.mkv
+
+   amix
+       Mixes multiple audio inputs into a single output.
+
+       Note that this filter only supports float samples (the amerge and pan
+       audio filters support many formats). If the amix input has integer
+       samples then aresample will be automatically inserted to perform the
+       conversion to float samples.
+
+       It accepts the following parameters:
+
+       inputs
+	   The number of inputs. If unspecified, it defaults to 2.
+
+       duration
+	   How to determine the end-of-stream.
+
+	   longest
+	       The duration of the longest input. (default)
+
+	   shortest
+	       The duration of the shortest input.
+
+	   first
+	       The duration of the first input.
+
+       dropout_transition
+	   The transition time, in seconds, for volume renormalization when an
+	   input stream ends. The default value is 2 seconds.
+
+       weights
+	   Specify weight of each input audio stream as a sequence of numbers
+	   separated by a space. If fewer weights are specified compared to
+	   number of inputs, the last weight is assigned to the remaining
+	   inputs.  Default weight for each input is 1.
+
+       normalize
+	   Always scale inputs instead of only doing summation of samples.
+	   Beware of heavy clipping if inputs are not normalized prior or
+	   after filtering by this filter if this option is disabled. By
+	   default is enabled.
+
+       Examples
+
+       o   This will mix 3 input audio streams to a single output with the
+	   same duration as the first input and a dropout transition time of 3
+	   seconds:
+
+		   ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex amix=inputs=3:duration=first:dropout_transition=3 OUTPUT
+
+       o   This will mix one vocal and one music input audio stream to a
+	   single output with the same duration as the longest input. The
+	   music will have quarter the weight as the vocals, and the inputs
+	   are not normalized:
+
+		   ffmpeg -i VOCALS -i MUSIC -filter_complex amix=inputs=2:duration=longest:dropout_transition=0:weights="1 0.25":normalize=0 OUTPUT
+
+       Commands
+
+       This filter supports the following commands:
+
+       weights
+       normalize
+	   Syntax is same as option with same name.
+
+   amultiply
+       Multiply first audio stream with second audio stream and store result
+       in output audio stream. Multiplication is done by multiplying each
+       sample from first stream with sample at same position from second
+       stream.
+
+       With this element-wise multiplication one can create amplitude fades
+       and amplitude modulations.
+
+   anequalizer
+       High-order parametric multiband equalizer for each channel.
+
+       It accepts the following parameters:
+
+       params
+	   This option string is in format: "cchn f=cf w=w g=g t=f | ..."
+	   Each equalizer band is separated by '|'.
+
+	   chn Set channel number to which equalization will be applied.  If
+	       input doesn't have that channel the entry is ignored.
+
+	   f   Set central frequency for band.	If input doesn't have that
+	       frequency the entry is ignored.
+
+	   w   Set band width in Hertz.
+
+	   g   Set band gain in dB.
+
+	   t   Set filter type for band, optional, can be:
+
+	       0   Butterworth, this is default.
+
+	       1   Chebyshev type 1.
+
+	       2   Chebyshev type 2.
+
+       curves
+	   With this option activated frequency response of anequalizer is
+	   displayed in video stream.
+
+       size
+	   Set video stream size. Only useful if curves option is activated.
+
+       mgain
+	   Set max gain that will be displayed. Only useful if curves option
+	   is activated.  Setting this to a reasonable value makes it possible
+	   to display gain which is derived from neighbour bands which are too
+	   close to each other and thus produce higher gain when both are
+	   activated.
+
+       fscale
+	   Set frequency scale used to draw frequency response in video
+	   output.  Can be linear or logarithmic. Default is logarithmic.
+
+       colors
+	   Set color for each channel curve which is going to be displayed in
+	   video stream.  This is list of color names separated by space or by
+	   '|'.  Unrecognised or missing colors will be replaced by white
+	   color.
+
+       Examples
+
+       o   Lower gain by 10 of central frequency 200Hz and width 100 Hz for
+	   first 2 channels using Chebyshev type 1 filter:
+
+		   anequalizer=c0 f=200 w=100 g=-10 t=1|c1 f=200 w=100 g=-10 t=1
+
+       Commands
+
+       This filter supports the following commands:
+
+       change
+	   Alter existing filter parameters.  Syntax for the commands is :
+	   "fN|f=freq|w=width|g=gain"
+
+	   fN is existing filter number, starting from 0, if no such filter is
+	   available error is returned.  freq set new frequency parameter.
+	   width set new width parameter in Hertz.  gain set new gain
+	   parameter in dB.
+
+	   Full filter invocation with asendcmd may look like this:
+	   asendcmd=c='4.0 anequalizer change
+	   0|f=200|w=50|g=1',anequalizer=...
+
+   anlmdn
+       Reduce broadband noise in audio samples using Non-Local Means
+       algorithm.
+
+       Each sample is adjusted by looking for other samples with similar
+       contexts. This context similarity is defined by comparing their
+       surrounding patches of size p. Patches are searched in an area of r
+       around the sample.
+
+       The filter accepts the following options:
+
+       strength, s
+	   Set denoising strength. Allowed range is from 0.00001 to 10000.
+	   Default value is 0.00001.
+
+       patch, p
+	   Set patch radius duration. Allowed range is from 1 to 100
+	   milliseconds.  Default value is 2 milliseconds.
+
+       research, r
+	   Set research radius duration. Allowed range is from 2 to 300
+	   milliseconds.  Default value is 6 milliseconds.
+
+       output, o
+	   Set the output mode.
+
+	   It accepts the following values:
+
+	   i   Pass input unchanged.
+
+	   o   Pass noise filtered out.
+
+	   n   Pass only noise.
+
+	       Default value is o.
+
+       smooth, m
+	   Set smooth factor. Default value is 11. Allowed range is from 1 to
+	   1000.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   anlmf, anlms
+       Apply Normalized Least-Mean-(Squares|Fourth) algorithm to the first
+       audio stream using the second audio stream.
+
+       This adaptive filter is used to mimic a desired filter by finding the
+       filter coefficients that relate to producing the least mean square of
+       the error signal (difference between the desired, 2nd input audio
+       stream and the actual signal, the 1st input audio stream).
+
+       A description of the accepted options follows.
+
+       order
+	   Set filter order.
+
+       mu  Set filter mu.
+
+       eps Set the filter eps.
+
+       leakage
+	   Set the filter leakage.
+
+       out_mode
+	   It accepts the following values:
+
+	   i   Pass the 1st input.
+
+	   d   Pass the 2nd input.
+
+	   o   Pass difference between desired, 2nd input and error signal
+	       estimate.
+
+	   n   Pass difference between input, 1st input and error signal
+	       estimate.
+
+	   e   Pass error signal estimated samples.
+
+	       Default value is o.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+       Examples
+
+       o   One of many usages of this filter is noise reduction, input audio
+	   is filtered with same samples that are delayed by fixed amount, one
+	   such example for stereo audio is:
+
+		   asplit[a][b],[a]adelay=32S|32S[a],[b][a]anlms=order=128:leakage=0.0005:mu=.5:out_mode=o
+
+       Commands
+
+       This filter supports the same commands as options, excluding option
+       "order".
+
+   anull
+       Pass the audio source unchanged to the output.
+
+   apad
+       Pad the end of an audio stream with silence.
+
+       This can be used together with ffmpeg -shortest to extend audio streams
+       to the same length as the video stream.
+
+       A description of the accepted options follows.
+
+       packet_size
+	   Set silence packet size. Default value is 4096.
+
+       pad_len
+	   Set the number of samples of silence to add to the end. After the
+	   value is reached, the stream is terminated. This option is mutually
+	   exclusive with whole_len.
+
+       whole_len
+	   Set the minimum total number of samples in the output audio stream.
+	   If the value is longer than the input audio length, silence is
+	   added to the end, until the value is reached. This option is
+	   mutually exclusive with pad_len.
+
+       pad_dur
+	   Specify the duration of samples of silence to add. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax. Used only if set to non-negative value.
+
+       whole_dur
+	   Specify the minimum total duration in the output audio stream. See
+	   the Time duration section in the ffmpeg-utils(1) manual for the
+	   accepted syntax. Used only if set to non-negative value. If the
+	   value is longer than the input audio length, silence is added to
+	   the end, until the value is reached.  This option is mutually
+	   exclusive with pad_dur
+
+       If neither the pad_len nor the whole_len nor pad_dur nor whole_dur
+       option is set, the filter will add silence to the end of the input
+       stream indefinitely.
+
+       Note that for ffmpeg 4.4 and earlier a zero pad_dur or whole_dur also
+       caused the filter to add silence indefinitely.
+
+       Examples
+
+       o   Add 1024 samples of silence to the end of the input:
+
+		   apad=pad_len=1024
+
+       o   Make sure the audio output will contain at least 10000 samples, pad
+	   the input with silence if required:
+
+		   apad=whole_len=10000
+
+       o   Use ffmpeg to pad the audio input with silence, so that the video
+	   stream will always result the shortest and will be converted until
+	   the end in the output file when using the shortest option:
+
+		   ffmpeg -i VIDEO -i AUDIO -filter_complex "[1:0]apad" -shortest OUTPUT
+
+   aphaser
+       Add a phasing effect to the input audio.
+
+       A phaser filter creates series of peaks and troughs in the frequency
+       spectrum.  The position of the peaks and troughs are modulated so that
+       they vary over time, creating a sweeping effect.
+
+       A description of the accepted parameters follows.
+
+       in_gain
+	   Set input gain. Default is 0.4.
+
+       out_gain
+	   Set output gain. Default is 0.74
+
+       delay
+	   Set delay in milliseconds. Default is 3.0.
+
+       decay
+	   Set decay. Default is 0.4.
+
+       speed
+	   Set modulation speed in Hz. Default is 0.5.
+
+       type
+	   Set modulation type. Default is triangular.
+
+	   It accepts the following values:
+
+	   triangular, t
+	   sinusoidal, s
+
+   aphaseshift
+       Apply phase shift to input audio samples.
+
+       The filter accepts the following options:
+
+       shift
+	   Specify phase shift. Allowed range is from -1.0 to 1.0.  Default
+	   value is 0.0.
+
+       level
+	   Set output gain applied to final output. Allowed range is from 0.0
+	   to 1.0.  Default value is 1.0.
+
+       order
+	   Set filter order used for filtering. Allowed range is from 1 to 16.
+	   Default value is 8.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   apsnr
+       Measure Audio Peak Signal-to-Noise Ratio.
+
+       This filter takes two audio streams for input, and outputs first audio
+       stream.	Results are in dB per channel at end of either input.
+
+   apsyclip
+       Apply Psychoacoustic clipper to input audio stream.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. By default it is 1. Range is [0.015625 - 64].
+
+       level_out
+	   Set output gain. By default it is 1. Range is [0.015625 - 64].
+
+       clip
+	   Set the clipping start value. Default value is 0dBFS or 1.
+
+       diff
+	   Output only difference samples, useful to hear introduced
+	   distortions.  By default is disabled.
+
+       adaptive
+	   Set strength of adaptive distortion applied. Default value is 0.5.
+	   Allowed range is from 0 to 1.
+
+       iterations
+	   Set number of iterations of psychoacoustic clipper.	Allowed range
+	   is from 1 to 20. Default value is 10.
+
+       level
+	   Auto level output signal. Default is disabled.  This normalizes
+	   audio back to 0dBFS if enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   apulsator
+       Audio pulsator is something between an autopanner and a tremolo.  But
+       it can produce funny stereo effects as well. Pulsator changes the
+       volume of the left and right channel based on a LFO (low frequency
+       oscillator) with different waveforms and shifted phases.  This filter
+       have the ability to define an offset between left and right channel. An
+       offset of 0 means that both LFO shapes match each other.  The left and
+       right channel are altered equally - a conventional tremolo.  An offset
+       of 50% means that the shape of the right channel is exactly shifted in
+       phase (or moved backwards about half of the frequency) - pulsator acts
+       as an autopanner. At 1 both curves match again. Every setting in
+       between moves the phase shift gapless between all stages and produces
+       some "bypassing" sounds with sine and triangle waveforms. The more you
+       set the offset near 1 (starting from the 0.5) the faster the signal
+       passes from the left to the right speaker.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. By default it is 1. Range is [0.015625 - 64].
+
+       level_out
+	   Set output gain. By default it is 1. Range is [0.015625 - 64].
+
+       mode
+	   Set waveform shape the LFO will use. Can be one of: sine, triangle,
+	   square, sawup or sawdown. Default is sine.
+
+       amount
+	   Set modulation. Define how much of original signal is affected by
+	   the LFO.
+
+       offset_l
+	   Set left channel offset. Default is 0. Allowed range is [0 - 1].
+
+       offset_r
+	   Set right channel offset. Default is 0.5. Allowed range is [0 - 1].
+
+       width
+	   Set pulse width. Default is 1. Allowed range is [0 - 2].
+
+       timing
+	   Set possible timing mode. Can be one of: bpm, ms or hz. Default is
+	   hz.
+
+       bpm Set bpm. Default is 120. Allowed range is [30 - 300]. Only used if
+	   timing is set to bpm.
+
+       ms  Set ms. Default is 500. Allowed range is [10 - 2000]. Only used if
+	   timing is set to ms.
+
+       hz  Set frequency in Hz. Default is 2. Allowed range is [0.01 - 100].
+	   Only used if timing is set to hz.
+
+   aresample
+       Resample the input audio to the specified parameters, using the
+       libswresample library. If none are specified then the filter will
+       automatically convert between its input and output.
+
+       This filter is also able to stretch/squeeze the audio data to make it
+       match the timestamps or to inject silence / cut out audio to make it
+       match the timestamps, do a combination of both or do neither.
+
+       The filter accepts the syntax [sample_rate:]resampler_options, where
+       sample_rate expresses a sample rate and resampler_options is a list of
+       key=value pairs, separated by ":". See the "Resampler Options" section
+       in the ffmpeg-resampler(1) manual for the complete list of supported
+       options.
+
+       Examples
+
+       o   Resample the input audio to 44100Hz:
+
+		   aresample=44100
+
+       o   Stretch/squeeze samples to the given timestamps, with a maximum of
+	   1000 samples per second compensation:
+
+		   aresample=async=1000
+
+   areverse
+       Reverse an audio clip.
+
+       Warning: This filter requires memory to buffer the entire clip, so
+       trimming is suggested.
+
+       Examples
+
+       o   Take the first 5 seconds of a clip, and reverse it.
+
+		   atrim=end=5,areverse
+
+   arls
+       Apply Recursive Least Squares algorithm to the first audio stream using
+       the second audio stream.
+
+       This adaptive filter is used to mimic a desired filter by recursively
+       finding the filter coefficients that relate to producing the minimal
+       weighted linear least squares cost function of the error signal
+       (difference between the desired, 2nd input audio stream and the actual
+       signal, the 1st input audio stream).
+
+       A description of the accepted options follows.
+
+       order
+	   Set the filter order.
+
+       lambda
+	   Set the forgetting factor.
+
+       delta
+	   Set the coefficient to initialize internal covariance matrix.
+
+       out_mode
+	   Set the filter output samples. It accepts the following values:
+
+	   i   Pass the 1st input.
+
+	   d   Pass the 2nd input.
+
+	   o   Pass difference between desired, 2nd input and error signal
+	       estimate.
+
+	   n   Pass difference between input, 1st input and error signal
+	       estimate.
+
+	   e   Pass error signal estimated samples.
+
+	       Default value is o.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+   arnndn
+       Reduce noise from speech using Recurrent Neural Networks.
+
+       This filter accepts the following options:
+
+       model, m
+	   Set train model file to load. This option is always required.
+
+       mix Set how much to mix filtered samples into final output.  Allowed
+	   range is from -1 to 1. Default value is 1.  Negative values are
+	   special, they set how much to keep filtered noise in the final
+	   filter output. Set this option to -1 to hear actual noise removed
+	   from input signal.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asdr
+       Measure Audio Signal-to-Distortion Ratio.
+
+       This filter takes two audio streams for input, and outputs first audio
+       stream.	Results are in dB per channel at end of either input.
+
+   asetnsamples
+       Set the number of samples per each output audio frame.
+
+       The last output packet may contain a different number of samples, as
+       the filter will flush all the remaining samples when the input audio
+       signals its end.
+
+       The filter accepts the following options:
+
+       nb_out_samples, n
+	   Set the number of frames per each output audio frame. The number is
+	   intended as the number of samples per each channel.	Default value
+	   is 1024.
+
+       pad, p
+	   If set to 1, the filter will pad the last audio frame with zeroes,
+	   so that the last frame will contain the same number of samples as
+	   the previous ones. Default value is 1.
+
+       For example, to set the number of per-frame samples to 1234 and disable
+       padding for the last frame, use:
+
+	       asetnsamples=n=1234:p=0
+
+   asetrate
+       Set the sample rate without altering the PCM data.  This will result in
+       a change of speed and pitch.
+
+       The filter accepts the following options:
+
+       sample_rate, r
+	   Set the output sample rate. Default is 44100 Hz.
+
+   ashowinfo
+       Show a line containing various information for each input audio frame.
+       The input audio is not modified.
+
+       The shown line contains a sequence of key/value pairs of the form
+       key:value.
+
+       The following values are shown in the output:
+
+       n   The (sequential) number of the input frame, starting from 0.
+
+       pts The presentation timestamp of the input frame, in time base units;
+	   the time base depends on the filter input pad, and is usually
+	   1/sample_rate.
+
+       pts_time
+	   The presentation timestamp of the input frame in seconds.
+
+       fmt The sample format.
+
+       chlayout
+	   The channel layout.
+
+       rate
+	   The sample rate for the audio frame.
+
+       nb_samples
+	   The number of samples (per channel) in the frame.
+
+       checksum
+	   The Adler-32 checksum (printed in hexadecimal) of the audio data.
+	   For planar audio, the data is treated as if all the planes were
+	   concatenated.
+
+       plane_checksums
+	   A list of Adler-32 checksums for each data plane.
+
+   asisdr
+       Measure Audio Scaled-Invariant Signal-to-Distortion Ratio.
+
+       This filter takes two audio streams for input, and outputs first audio
+       stream.	Results are in dB per channel at end of either input.
+
+   asoftclip
+       Apply audio soft clipping.
+
+       Soft clipping is a type of distortion effect where the amplitude of a
+       signal is saturated along a smooth curve, rather than the abrupt shape
+       of hard-clipping.
+
+       This filter accepts the following options:
+
+       type
+	   Set type of soft-clipping.
+
+	   It accepts the following values:
+
+	   hard
+	   tanh
+	   atan
+	   cubic
+	   exp
+	   alg
+	   quintic
+	   sin
+	   erf
+       threshold
+	   Set threshold from where to start clipping. Default value is 0dB or
+	   1.
+
+       output
+	   Set gain applied to output. Default value is 0dB or 1.
+
+       param
+	   Set additional parameter which controls sigmoid function.
+
+       oversample
+	   Set oversampling factor.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aspectralstats
+       Display frequency domain statistical information about the audio
+       channels.  Statistics are calculated and stored as metadata for each
+       audio channel and for each audio frame.
+
+       It accepts the following option:
+
+       win_size
+	   Set the window length in samples. Default value is 2048.  Allowed
+	   range is from 32 to 65536.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann, hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hann".
+
+       overlap
+	   Set window overlap. Allowed range is from 0 to 1. Default value is
+	   0.5.
+
+       measure
+	   Select the parameters which are measured. The metadata keys can be
+	   used as flags, default is all which measures everything.  none
+	   disables all measurement.
+
+       A list of each metadata key follows:
+
+       mean
+       variance
+       centroid
+       spread
+       skewness
+       kurtosis
+       entropy
+       flatness
+       crest
+       flux
+       slope
+       decrease
+       rolloff
+
+   asr
+       Automatic Speech Recognition
+
+       This filter uses PocketSphinx for speech recognition. To enable
+       compilation of this filter, you need to configure FFmpeg with
+       "--enable-pocketsphinx".
+
+       It accepts the following options:
+
+       rate
+	   Set sampling rate of input audio. Defaults is 16000.  This need to
+	   match speech models, otherwise one will get poor results.
+
+       hmm Set dictionary containing acoustic model files.
+
+       dict
+	   Set pronunciation dictionary.
+
+       lm  Set language model file.
+
+       lmctl
+	   Set language model set.
+
+       lmname
+	   Set which language model to use.
+
+       logfn
+	   Set output for log messages.
+
+       The filter exports recognized speech as the frame metadata
+       "lavfi.asr.text".
+
+   astats
+       Display time domain statistical information about the audio channels.
+       Statistics are calculated and displayed for each audio channel and,
+       where applicable, an overall figure is also given.
+
+       It accepts the following option:
+
+       length
+	   Short window length in seconds, used for peak and trough RMS
+	   measurement.  Default is 0.05 (50 milliseconds). Allowed range is
+	   "[0 - 10]".
+
+       metadata
+	   Set metadata injection. All the metadata keys are prefixed with
+	   "lavfi.astats.X", where "X" is channel number starting from 1 or
+	   string "Overall". Default is disabled.
+
+	   Available keys for each channel are: Bit_depth Crest_factor
+	   DC_offset Dynamic_range Entropy Flat_factor Max_difference
+	   Max_level Mean_difference Min_difference Min_level Noise_floor
+	   Noise_floor_count Number_of_Infs Number_of_NaNs Number_of_denormals
+	   Peak_count Abs_Peak_count Peak_level RMS_difference RMS_peak
+	   RMS_trough Zero_crossings Zero_crossings_rate
+
+	   and for "Overall": Bit_depth DC_offset Entropy Flat_factor
+	   Max_difference Max_level Mean_difference Min_difference Min_level
+	   Noise_floor Noise_floor_count Number_of_Infs Number_of_NaNs
+	   Number_of_denormals Number_of_samples Peak_count Abs_Peak_count
+	   Peak_level RMS_difference RMS_level RMS_peak RMS_trough
+
+	   For example, a full key looks like "lavfi.astats.1.DC_offset" or
+	   "lavfi.astats.Overall.Peak_count".
+
+	   Read below for the description of the keys.
+
+       reset
+	   Set the number of frames over which cumulative stats are calculated
+	   before being reset. Default is disabled.
+
+       measure_perchannel
+	   Select the parameters which are measured per channel. The metadata
+	   keys can be used as flags, default is all which measures
+	   everything.	none disables all per channel measurement.
+
+       measure_overall
+	   Select the parameters which are measured overall. The metadata keys
+	   can be used as flags, default is all which measures everything.
+	   none disables all overall measurement.
+
+       A description of the measure keys follow:
+
+       none
+	   no measures
+
+       all all measures
+
+       Bit_depth
+	   overall bit depth of audio, i.e. number of bits used for each
+	   sample
+
+       Crest_factor
+	   standard ratio of peak to RMS level (note: not in dB)
+
+       DC_offset
+	   mean amplitude displacement from zero
+
+       Dynamic_range
+	   measured dynamic range of audio in dB
+
+       Entropy
+	   entropy measured across whole audio, entropy of value near 1.0 is
+	   typically measured for white noise
+
+       Flat_factor
+	   flatness (i.e. consecutive samples with the same value) of the
+	   signal at its peak levels (i.e. either Min_level or Max_level)
+
+       Max_difference
+	   maximal difference between two consecutive samples
+
+       Max_level
+	   maximal sample level
+
+       Mean_difference
+	   mean difference between two consecutive samples, i.e. the average
+	   of each difference between two consecutive samples
+
+       Min_difference
+	   minimal difference between two consecutive samples
+
+       Min_level
+	   minimal sample level
+
+       Noise_floor
+	   minimum local peak measured in dBFS over a short window
+
+       Noise_floor_count
+	   number of occasions (not the number of samples) that the signal
+	   attained Noise floor
+
+       Number_of_Infs
+	   number of samples with an infinite value
+
+       Number_of_NaNs
+	   number of samples with a NaN (not a number) value
+
+       Number_of_denormals
+	   number of samples with a subnormal value
+
+       Number_of_samples
+	   number of samples
+
+       Peak_count
+	   number of occasions (not the number of samples) that the signal
+	   attained either Min_level or Max_level
+
+       Abs_Peak_count
+	   number of occasions that the absolute samples taken from the signal
+	   attained max absolute value of Min_level and Max_level
+
+       Peak_level
+	   standard peak level measured in dBFS
+
+       RMS_difference
+	   Root Mean Square difference between two consecutive samples
+
+       RMS_level
+	   standard RMS level measured in dBFS
+
+       RMS_peak
+       RMS_trough
+	   peak and trough values for RMS level measured over a short window,
+	   measured in dBFS.
+
+       Zero crossings
+	   number of points where the waveform crosses the zero level axis
+
+       Zero crossings rate
+	   rate of Zero crossings and number of audio samples
+
+   asubboost
+       Boost subwoofer frequencies.
+
+       The filter accepts the following options:
+
+       dry Set dry gain, how much of original signal is kept. Allowed range is
+	   from 0 to 1.  Default value is 1.0.
+
+       wet Set wet gain, how much of filtered signal is kept. Allowed range is
+	   from 0 to 1.  Default value is 1.0.
+
+       boost
+	   Set max boost factor. Allowed range is from 1 to 12. Default value
+	   is 2.
+
+       decay
+	   Set delay line decay gain value. Allowed range is from 0 to 1.
+	   Default value is 0.0.
+
+       feedback
+	   Set delay line feedback gain value. Allowed range is from 0 to 1.
+	   Default value is 0.9.
+
+       cutoff
+	   Set cutoff frequency in Hertz. Allowed range is 50 to 900.  Default
+	   value is 100.
+
+       slope
+	   Set slope amount for cutoff frequency. Allowed range is 0.0001 to
+	   1.  Default value is 0.5.
+
+       delay
+	   Set delay. Allowed range is from 1 to 100.  Default value is 20.
+
+       channels
+	   Set the channels to process. Default value is all available.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asubcut
+       Cut subwoofer frequencies.
+
+       This filter allows to set custom, steeper roll off than highpass
+       filter, and thus is able to more attenuate frequency content in stop-
+       band.
+
+       The filter accepts the following options:
+
+       cutoff
+	   Set cutoff frequency in Hertz. Allowed range is 2 to 200.  Default
+	   value is 20.
+
+       order
+	   Set filter order. Available values are from 3 to 20.  Default value
+	   is 10.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 1. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asupercut
+       Cut super frequencies.
+
+       The filter accepts the following options:
+
+       cutoff
+	   Set cutoff frequency in Hertz. Allowed range is 20000 to 192000.
+	   Default value is 20000.
+
+       order
+	   Set filter order. Available values are from 3 to 20.  Default value
+	   is 10.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 1. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asuperpass
+       Apply high order Butterworth band-pass filter.
+
+       The filter accepts the following options:
+
+       centerf
+	   Set center frequency in Hertz. Allowed range is 2 to 999999.
+	   Default value is 1000.
+
+       order
+	   Set filter order. Available values are from 4 to 20.  Default value
+	   is 4.
+
+       qfactor
+	   Set Q-factor. Allowed range is from 0.01 to 100. Default value is
+	   1.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 2. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asuperstop
+       Apply high order Butterworth band-stop filter.
+
+       The filter accepts the following options:
+
+       centerf
+	   Set center frequency in Hertz. Allowed range is 2 to 999999.
+	   Default value is 1000.
+
+       order
+	   Set filter order. Available values are from 4 to 20.  Default value
+	   is 4.
+
+       qfactor
+	   Set Q-factor. Allowed range is from 0.01 to 100. Default value is
+	   1.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 2. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   atempo
+       Adjust audio tempo.
+
+       The filter accepts exactly one parameter, the audio tempo. If not
+       specified then the filter will assume nominal 1.0 tempo. Tempo must be
+       in the [0.5, 100.0] range.
+
+       Note that tempo greater than 2 will skip some samples rather than blend
+       them in.  If for any reason this is a concern it is always possible to
+       daisy-chain several instances of atempo to achieve the desired product
+       tempo.
+
+       Examples
+
+       o   Slow down audio to 80% tempo:
+
+		   atempo=0.8
+
+       o   To speed up audio to 300% tempo:
+
+		   atempo=3
+
+       o   To speed up audio to 300% tempo by daisy-chaining two atempo
+	   instances:
+
+		   atempo=sqrt(3),atempo=sqrt(3)
+
+       Commands
+
+       This filter supports the following commands:
+
+       tempo
+	   Change filter tempo scale factor.  Syntax for the command is :
+	   "tempo"
+
+   atilt
+       Apply spectral tilt filter to audio stream.
+
+       This filter apply any spectral roll-off slope over any specified
+       frequency band.
+
+       The filter accepts the following options:
+
+       freq
+	   Set central frequency of tilt in Hz. Default is 10000 Hz.
+
+       slope
+	   Set slope direction of tilt. Default is 0. Allowed range is from -1
+	   to 1.
+
+       width
+	   Set width of tilt. Default is 1000. Allowed range is from 100 to
+	   10000.
+
+       order
+	   Set order of tilt filter.
+
+       level
+	   Set input volume level. Allowed range is from 0 to 4.  Default is
+	   1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   atrim
+       Trim the input so that the output contains one continuous subpart of
+       the input.
+
+       It accepts the following parameters:
+
+       start
+	   Timestamp (in seconds) of the start of the section to keep. I.e.
+	   the audio sample with the timestamp start will be the first sample
+	   in the output.
+
+       end Specify time of the first audio sample that will be dropped, i.e.
+	   the audio sample immediately preceding the one with the timestamp
+	   end will be the last sample in the output.
+
+       start_pts
+	   Same as start, except this option sets the start timestamp in
+	   samples instead of seconds.
+
+       end_pts
+	   Same as end, except this option sets the end timestamp in samples
+	   instead of seconds.
+
+       duration
+	   The maximum duration of the output in seconds.
+
+       start_sample
+	   The number of the first sample that should be output.
+
+       end_sample
+	   The number of the first sample that should be dropped.
+
+       start, end, and duration are expressed as time duration specifications;
+       see the Time duration section in the ffmpeg-utils(1) manual.
+
+       Note that the first two sets of the start/end options and the duration
+       option look at the frame timestamp, while the _sample options simply
+       count the samples that pass through the filter. So start/end_pts and
+       start/end_sample will give different results when the timestamps are
+       wrong, inexact or do not start at zero. Also note that this filter does
+       not modify the timestamps. If you wish to have the output timestamps
+       start at zero, insert the asetpts filter after the atrim filter.
+
+       If multiple start or end options are set, this filter tries to be
+       greedy and keep all samples that match at least one of the specified
+       constraints. To keep only the part that matches all the constraints at
+       once, chain multiple atrim filters.
+
+       The defaults are such that all the input is kept. So it is possible to
+       set e.g.  just the end values to keep everything before the specified
+       time.
+
+       Examples:
+
+       o   Drop everything except the second minute of input:
+
+		   ffmpeg -i INPUT -af atrim=60:120
+
+       o   Keep only the first 1000 samples:
+
+		   ffmpeg -i INPUT -af atrim=end_sample=1000
+
+   axcorrelate
+       Calculate normalized windowed cross-correlation between two input audio
+       streams.
+
+       Resulted samples are always between -1 and 1 inclusive.	If result is 1
+       it means two input samples are highly correlated in that selected
+       segment.  Result 0 means they are not correlated at all.  If result is
+       -1 it means two input samples are out of phase, which means they cancel
+       each other.
+
+       The filter accepts the following options:
+
+       size
+	   Set size of segment over which cross-correlation is calculated.
+	   Default is 256. Allowed range is from 2 to 131072.
+
+       algo
+	   Set algorithm for cross-correlation. Can be "slow" or "fast" or
+	   "best".  Default is "best". Fast algorithm assumes mean values over
+	   any given segment are always zero and thus need much less
+	   calculations to make.  This is generally not true, but is valid for
+	   typical audio streams.
+
+       Examples
+
+       o   Calculate correlation between channels in stereo audio stream:
+
+		   ffmpeg -i stereo.wav -af channelsplit,axcorrelate=size=1024:algo=fast correlation.wav
+
+   bandpass
+       Apply a two-pole Butterworth band-pass filter with central frequency
+       frequency, and (3dB-point) band-width width.  The csg option selects a
+       constant skirt gain (peak gain = Q) instead of the default: constant
+       0dB peak gain.  The filter roll off at 6dB per octave (20dB per
+       decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the filter's central frequency. Default is 3000.
+
+       csg Constant skirt gain if set to 1. Defaults to 0.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change bandpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change bandpass width_type.	Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change bandpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change bandpass mix.  Syntax for the command is : "mix"
+
+   bandreject
+       Apply a two-pole Butterworth band-reject filter with central frequency
+       frequency, and (3dB-point) band-width width.  The filter roll off at
+       6dB per octave (20dB per decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the filter's central frequency. Default is 3000.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change bandreject frequency.  Syntax for the command is :
+	   "frequency"
+
+       width_type, t
+	   Change bandreject width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change bandreject width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change bandreject mix.  Syntax for the command is : "mix"
+
+   bass, lowshelf
+       Boost or cut the bass (lower) frequencies of the audio using a two-pole
+       shelving filter with a response similar to that of a standard hi-fi's
+       tone-controls. This is also known as shelving equalisation (EQ).
+
+       The filter accepts the following options:
+
+       gain, g
+	   Give the gain at 0 Hz. Its useful range is about -20 (for a large
+	   cut) to +20 (for a large boost).  Beware of clipping when using a
+	   positive gain.
+
+       frequency, f
+	   Set the filter's central frequency and so can be used to extend or
+	   reduce the frequency range to be boosted or cut.  The default value
+	   is 100 Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Determine how steep is the filter's shelf transition.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change bass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change bass width_type.  Syntax for the command is : "width_type"
+
+       width, w
+	   Change bass width.  Syntax for the command is : "width"
+
+       gain, g
+	   Change bass gain.  Syntax for the command is : "gain"
+
+       mix, m
+	   Change bass mix.  Syntax for the command is : "mix"
+
+   biquad
+       Apply a biquad IIR filter with the given coefficients.  Where b0, b1,
+       b2 and a0, a1, a2 are the numerator and denominator coefficients
+       respectively.  and channels, c specify which channels to filter, by
+       default all available are filtered.
+
+       Commands
+
+       This filter supports the following commands:
+
+       a0
+       a1
+       a2
+       b0
+       b1
+       b2  Change biquad parameter.  Syntax for the command is : "value"
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+   bs2b
+       Bauer stereo to binaural transformation, which improves headphone
+       listening of stereo audio records.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libbs2b".
+
+       It accepts the following parameters:
+
+       profile
+	   Pre-defined crossfeed level.
+
+	   default
+	       Default level (fcut=700, feed=50).
+
+	   cmoy
+	       Chu Moy circuit (fcut=700, feed=60).
+
+	   jmeier
+	       Jan Meier circuit (fcut=650, feed=95).
+
+       fcut
+	   Cut frequency (in Hz).
+
+       feed
+	   Feed level (in Hz).
+
+   channelmap
+       Remap input channels to new locations.
+
+       It accepts the following parameters:
+
+       map Map channels from input to output. The argument is a '|'-separated
+	   list of mappings, each in the "in_channel-out_channel" or
+	   "in_channel" form. in_channel can be either the name of the input
+	   channel (e.g. FL for front left) or its index in the input channel
+	   layout. out_channel is the name of the output channel or its index
+	   in the output channel layout. If out_channel is not given then it
+	   is implicitly an index, starting with zero and increasing by one
+	   for each mapping. Mixing different types of mappings is not allowed
+	   and will result in a parse error.
+
+       channel_layout
+	   The channel layout of the output stream. If not specified, then
+	   filter will guess it based on the out_channel names or the number
+	   of mappings.  Guessed layouts will not necessarily contain channels
+	   in the order of the mappings.
+
+       If no mapping is present, the filter will implicitly map input channels
+       to output channels, preserving indices.
+
+       Examples
+
+       o   For example, assuming a 5.1+downmix input MOV file,
+
+		   ffmpeg -i in.mov -filter 'channelmap=map=DL-FL|DR-FR' out.wav
+
+	   will create an output WAV file tagged as stereo from the downmix
+	   channels of the input.
+
+       o   To fix a 5.1 WAV improperly encoded in AAC's native channel order
+
+		   ffmpeg -i in.wav -filter 'channelmap=1|2|0|5|3|4:5.1' out.wav
+
+   channelsplit
+       Split each channel from an input audio stream into a separate output
+       stream.
+
+       It accepts the following parameters:
+
+       channel_layout
+	   The channel layout of the input stream. The default is "stereo".
+
+       channels
+	   A channel layout describing the channels to be extracted as
+	   separate output streams or "all" to extract each input channel as a
+	   separate stream. The default is "all".
+
+	   Choosing channels not present in channel layout in the input will
+	   result in an error.
+
+       Examples
+
+       o   For example, assuming a stereo input MP3 file,
+
+		   ffmpeg -i in.mp3 -filter_complex channelsplit out.mkv
+
+	   will create an output Matroska file with two audio streams, one
+	   containing only the left channel and the other the right channel.
+
+       o   Split a 5.1 WAV file into per-channel files:
+
+		   ffmpeg -i in.wav -filter_complex
+		   'channelsplit=channel_layout=5.1[FL][FR][FC][LFE][SL][SR]'
+		   -map '[FL]' front_left.wav -map '[FR]' front_right.wav -map '[FC]'
+		   front_center.wav -map '[LFE]' lfe.wav -map '[SL]' side_left.wav -map '[SR]'
+		   side_right.wav
+
+       o   Extract only LFE from a 5.1 WAV file:
+
+		   ffmpeg -i in.wav -filter_complex 'channelsplit=channel_layout=5.1:channels=LFE[LFE]'
+		   -map '[LFE]' lfe.wav
+
+   chorus
+       Add a chorus effect to the audio.
+
+       Can make a single vocal sound like a chorus, but can also be applied to
+       instrumentation.
+
+       Chorus resembles an echo effect with a short delay, but whereas with
+       echo the delay is constant, with chorus, it is varied using using
+       sinusoidal or triangular modulation.  The modulation depth defines the
+       range the modulated delay is played before or after the delay. Hence
+       the delayed sound will sound slower or faster, that is the delayed
+       sound tuned around the original one, like in a chorus where some vocals
+       are slightly off key.
+
+       It accepts the following parameters:
+
+       in_gain
+	   Set input gain. Default is 0.4.
+
+       out_gain
+	   Set output gain. Default is 0.4.
+
+       delays
+	   Set delays. A typical delay is around 40ms to 60ms.
+
+       decays
+	   Set decays.
+
+       speeds
+	   Set speeds.
+
+       depths
+	   Set depths.
+
+       Examples
+
+       o   A single delay:
+
+		   chorus=0.7:0.9:55:0.4:0.25:2
+
+       o   Two delays:
+
+		   chorus=0.6:0.9:50|60:0.4|0.32:0.25|0.4:2|1.3
+
+       o   Fuller sounding chorus with three delays:
+
+		   chorus=0.5:0.9:50|60|40:0.4|0.32|0.3:0.25|0.4|0.3:2|2.3|1.3
+
+   compand
+       Compress or expand the audio's dynamic range.
+
+       It accepts the following parameters:
+
+       attacks
+       decays
+	   A list of times in seconds for each channel over which the
+	   instantaneous level of the input signal is averaged to determine
+	   its volume. attacks refers to increase of volume and decays refers
+	   to decrease of volume. For most situations, the attack time
+	   (response to the audio getting louder) should be shorter than the
+	   decay time, because the human ear is more sensitive to sudden loud
+	   audio than sudden soft audio. A typical value for attack is 0.3
+	   seconds and a typical value for decay is 0.8 seconds.  If specified
+	   number of attacks & decays is lower than number of channels, the
+	   last set attack/decay will be used for all remaining channels.
+
+       points
+	   A list of points for the transfer function, specified in dB
+	   relative to the maximum possible signal amplitude. Each key points
+	   list must be defined using the following syntax:
+	   "x0/y0|x1/y1|x2/y2|...." or "x0/y0 x1/y1 x2/y2 ...."
+
+	   The input values must be in strictly increasing order but the
+	   transfer function does not have to be monotonically rising. The
+	   point "0/0" is assumed but may be overridden (by "0/out-dBn").
+	   Typical values for the transfer function are "-70/-70|-60/-20|1/0".
+
+       soft-knee
+	   Set the curve radius in dB for all joints. It defaults to 0.01.
+
+       gain
+	   Set the additional gain in dB to be applied at all points on the
+	   transfer function. This allows for easy adjustment of the overall
+	   gain.  It defaults to 0.
+
+       volume
+	   Set an initial volume, in dB, to be assumed for each channel when
+	   filtering starts. This permits the user to supply a nominal level
+	   initially, so that, for example, a very large gain is not applied
+	   to initial signal levels before the companding has begun to
+	   operate. A typical value for audio which is initially quiet is -90
+	   dB. It defaults to 0.
+
+       delay
+	   Set a delay, in seconds. The input audio is analyzed immediately,
+	   but audio is delayed before being fed to the volume adjuster.
+	   Specifying a delay approximately equal to the attack/decay times
+	   allows the filter to effectively operate in predictive rather than
+	   reactive mode. It defaults to 0.
+
+       Examples
+
+       o   Make music with both quiet and loud passages suitable for listening
+	   to in a noisy environment:
+
+		   compand=.3|.3:1|1:-90/-60|-60/-40|-40/-30|-20/-20:6:0:-90:0.2
+
+	   Another example for audio with whisper and explosion parts:
+
+		   compand=0|0:1|1:-90/-900|-70/-70|-30/-9|0/-3:6:0:0:0
+
+       o   A noise gate for when the noise is at a lower level than the
+	   signal:
+
+		   compand=.1|.1:.2|.2:-900/-900|-50.1/-900|-50/-50:.01:0:-90:.1
+
+       o   Here is another noise gate, this time for when the noise is at a
+	   higher level than the signal (making it, in some ways, similar to
+	   squelch):
+
+		   compand=.1|.1:.1|.1:-45.1/-45.1|-45/-900|0/-900:.01:45:-90:.1
+
+       o   2:1 compression starting at -6dB:
+
+		   compand=points=-80/-80|-6/-6|0/-3.8|20/3.5
+
+       o   2:1 compression starting at -9dB:
+
+		   compand=points=-80/-80|-9/-9|0/-5.3|20/2.9
+
+       o   2:1 compression starting at -12dB:
+
+		   compand=points=-80/-80|-12/-12|0/-6.8|20/1.9
+
+       o   2:1 compression starting at -18dB:
+
+		   compand=points=-80/-80|-18/-18|0/-9.8|20/0.7
+
+       o   3:1 compression starting at -15dB:
+
+		   compand=points=-80/-80|-15/-15|0/-10.8|20/-5.2
+
+       o   Compressor/Gate:
+
+		   compand=points=-80/-105|-62/-80|-15.4/-15.4|0/-12|20/-7.6
+
+       o   Expander:
+
+		   compand=attacks=0:points=-80/-169|-54/-80|-49.5/-64.6|-41.1/-41.1|-25.8/-15|-10.8/-4.5|0/0|20/8.3
+
+       o   Hard limiter at -6dB:
+
+		   compand=attacks=0:points=-80/-80|-6/-6|20/-6
+
+       o   Hard limiter at -12dB:
+
+		   compand=attacks=0:points=-80/-80|-12/-12|20/-12
+
+       o   Hard noise gate at -35 dB:
+
+		   compand=attacks=0:points=-80/-115|-35.1/-80|-35/-35|20/20
+
+       o   Soft limiter:
+
+		   compand=attacks=0:points=-80/-80|-12.4/-12.4|-6/-8|0/-6.8|20/-2.8
+
+   compensationdelay
+       Compensation Delay Line is a metric based delay to compensate differing
+       positions of microphones or speakers.
+
+       For example, you have recorded guitar with two microphones placed in
+       different locations. Because the front of sound wave has fixed speed in
+       normal conditions, the phasing of microphones can vary and depends on
+       their location and interposition. The best sound mix can be achieved
+       when these microphones are in phase (synchronized). Note that a
+       distance of ~30 cm between microphones makes one microphone capture the
+       signal in antiphase to the other microphone. That makes the final mix
+       sound moody.  This filter helps to solve phasing problems by adding
+       different delays to each microphone track and make them synchronized.
+
+       The best result can be reached when you take one track as base and
+       synchronize other tracks one by one with it.  Remember that
+       synchronization/delay tolerance depends on sample rate, too.  Higher
+       sample rates will give more tolerance.
+
+       The filter accepts the following parameters:
+
+       mm  Set millimeters distance. This is compensation distance for fine
+	   tuning.  Default is 0.
+
+       cm  Set cm distance. This is compensation distance for tightening
+	   distance setup.  Default is 0.
+
+       m   Set meters distance. This is compensation distance for hard
+	   distance setup.  Default is 0.
+
+       dry Set dry amount. Amount of unprocessed (dry) signal.	Default is 0.
+
+       wet Set wet amount. Amount of processed (wet) signal.  Default is 1.
+
+       temp
+	   Set temperature in degrees Celsius. This is the temperature of the
+	   environment.  Default is 20.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   crossfeed
+       Apply headphone crossfeed filter.
+
+       Crossfeed is the process of blending the left and right channels of
+       stereo audio recording.	It is mainly used to reduce extreme stereo
+       separation of low frequencies.
+
+       The intent is to produce more speaker like sound to the listener.
+
+       The filter accepts the following options:
+
+       strength
+	   Set strength of crossfeed. Default is 0.2. Allowed range is from 0
+	   to 1.  This sets gain of low shelf filter for side part of stereo
+	   image.  Default is -6dB. Max allowed is -30db when strength is set
+	   to 1.
+
+       range
+	   Set soundstage wideness. Default is 0.5. Allowed range is from 0 to
+	   1.  This sets cut off frequency of low shelf filter. Default is cut
+	   off near 1550 Hz. With range set to 1 cut off frequency is set to
+	   2100 Hz.
+
+       slope
+	   Set curve slope of low shelf filter. Default is 0.5.  Allowed range
+	   is from 0.01 to 1.
+
+       level_in
+	   Set input gain. Default is 0.9.
+
+       level_out
+	   Set output gain. Default is 1.
+
+       block_size
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   crystalizer
+       Simple algorithm for audio noise sharpening.
+
+       This filter linearly increases differences between each audio sample.
+
+       The filter accepts the following options:
+
+       i   Sets the intensity of effect (default: 2.0). Must be in range
+	   between -10.0 to 0 (unchanged sound) to 10.0 (maximum effect).  To
+	   inverse filtering use negative value.
+
+       c   Enable clipping. By default is enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   dcshift
+       Apply a DC shift to the audio.
+
+       This can be useful to remove a DC offset (caused perhaps by a hardware
+       problem in the recording chain) from the audio. The effect of a DC
+       offset is reduced headroom and hence volume. The astats filter can be
+       used to determine if a signal has a DC offset.
+
+       shift
+	   Set the DC shift, allowed range is [-1, 1]. It indicates the amount
+	   to shift the audio.
+
+       limitergain
+	   Optional. It should have a value much less than 1 (e.g. 0.05 or
+	   0.02) and is used to prevent clipping.
+
+   deesser
+       Apply de-essing to the audio samples.
+
+       i   Set intensity for triggering de-essing. Allowed range is from 0 to
+	   1.  Default is 0.
+
+       m   Set amount of ducking on treble part of sound. Allowed range is
+	   from 0 to 1.  Default is 0.5.
+
+       f   How much of original frequency content to keep when de-essing.
+	   Allowed range is from 0 to 1.  Default is 0.5.
+
+       s   Set the output mode.
+
+	   It accepts the following values:
+
+	   i   Pass input unchanged.
+
+	   o   Pass ess filtered out.
+
+	   e   Pass only ess.
+
+	       Default value is o.
+
+   dialoguenhance
+       Enhance dialogue in stereo audio.
+
+       This filter accepts stereo input and produce surround (3.0) channels
+       output.	The newly produced front center channel have enhanced speech
+       dialogue originally available in both stereo channels.  This filter
+       outputs front left and front right channels same as available in stereo
+       input.
+
+       The filter accepts the following options:
+
+       original
+	   Set the original center factor to keep in front center channel
+	   output.  Allowed range is from 0 to 1. Default value is 1.
+
+       enhance
+	   Set the dialogue enhance factor to put in front center channel
+	   output.  Allowed range is from 0 to 3. Default value is 1.
+
+       voice
+	   Set the voice detection factor.  Allowed range is from 2 to 32.
+	   Default value is 2.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   drmeter
+       Measure audio dynamic range.
+
+       DR values of 14 and higher is found in very dynamic material. DR of 8
+       to 13 is found in transition material. And anything less that 8 have
+       very poor dynamics and is very compressed.
+
+       The filter accepts the following options:
+
+       length
+	   Set window length in seconds used to split audio into segments of
+	   equal length.  Default is 3 seconds.
+
+   dynaudnorm
+       Dynamic Audio Normalizer.
+
+       This filter applies a certain amount of gain to the input audio in
+       order to bring its peak magnitude to a target level (e.g. 0 dBFS).
+       However, in contrast to more "simple" normalization algorithms, the
+       Dynamic Audio Normalizer *dynamically* re-adjusts the gain factor to
+       the input audio.  This allows for applying extra gain to the "quiet"
+       sections of the audio while avoiding distortions or clipping the "loud"
+       sections. In other words: The Dynamic Audio Normalizer will "even out"
+       the volume of quiet and loud sections, in the sense that the volume of
+       each section is brought to the same target level. Note, however, that
+       the Dynamic Audio Normalizer achieves this goal *without* applying
+       "dynamic range compressing". It will retain 100% of the dynamic range
+       *within* each section of the audio file.
+
+       framelen, f
+	   Set the frame length in milliseconds. In range from 10 to 8000
+	   milliseconds.  Default is 500 milliseconds.	The Dynamic Audio
+	   Normalizer processes the input audio in small chunks, referred to
+	   as frames. This is required, because a peak magnitude has no
+	   meaning for just a single sample value. Instead, we need to
+	   determine the peak magnitude for a contiguous sequence of sample
+	   values. While a "standard" normalizer would simply use the peak
+	   magnitude of the complete file, the Dynamic Audio Normalizer
+	   determines the peak magnitude individually for each frame. The
+	   length of a frame is specified in milliseconds. By default, the
+	   Dynamic Audio Normalizer uses a frame length of 500 milliseconds,
+	   which has been found to give good results with most files.  Note
+	   that the exact frame length, in number of samples, will be
+	   determined automatically, based on the sampling rate of the
+	   individual input audio file.
+
+       gausssize, g
+	   Set the Gaussian filter window size. In range from 3 to 301, must
+	   be odd number. Default is 31.  Probably the most important
+	   parameter of the Dynamic Audio Normalizer is the "window size" of
+	   the Gaussian smoothing filter. The filter's window size is
+	   specified in frames, centered around the current frame. For the
+	   sake of simplicity, this must be an odd number. Consequently, the
+	   default value of 31 takes into account the current frame, as well
+	   as the 15 preceding frames and the 15 subsequent frames. Using a
+	   larger window results in a stronger smoothing effect and thus in
+	   less gain variation, i.e. slower gain adaptation. Conversely, using
+	   a smaller window results in a weaker smoothing effect and thus in
+	   more gain variation, i.e. faster gain adaptation.  In other words,
+	   the more you increase this value, the more the Dynamic Audio
+	   Normalizer will behave like a "traditional" normalization filter.
+	   On the contrary, the more you decrease this value, the more the
+	   Dynamic Audio Normalizer will behave like a dynamic range
+	   compressor.
+
+       peak, p
+	   Set the target peak value. This specifies the highest permissible
+	   magnitude level for the normalized audio input. This filter will
+	   try to approach the target peak magnitude as closely as possible,
+	   but at the same time it also makes sure that the normalized signal
+	   will never exceed the peak magnitude.  A frame's maximum local gain
+	   factor is imposed directly by the target peak magnitude. The
+	   default value is 0.95 and thus leaves a headroom of 5%*.  It is not
+	   recommended to go above this value.
+
+       maxgain, m
+	   Set the maximum gain factor. In range from 1.0 to 100.0. Default is
+	   10.0.  The Dynamic Audio Normalizer determines the maximum possible
+	   (local) gain factor for each input frame, i.e. the maximum gain
+	   factor that does not result in clipping or distortion. The maximum
+	   gain factor is determined by the frame's highest magnitude sample.
+	   However, the Dynamic Audio Normalizer additionally bounds the
+	   frame's maximum gain factor by a predetermined (global) maximum
+	   gain factor. This is done in order to avoid excessive gain factors
+	   in "silent" or almost silent frames. By default, the maximum gain
+	   factor is 10.0, For most inputs the default value should be
+	   sufficient and it usually is not recommended to increase this
+	   value. Though, for input with an extremely low overall volume
+	   level, it may be necessary to allow even higher gain factors. Note,
+	   however, that the Dynamic Audio Normalizer does not simply apply a
+	   "hard" threshold (i.e. cut off values above the threshold).
+	   Instead, a "sigmoid" threshold function will be applied. This way,
+	   the gain factors will smoothly approach the threshold value, but
+	   never exceed that value.
+
+       targetrms, r
+	   Set the target RMS. In range from 0.0 to 1.0. Default is 0.0 -
+	   disabled.  By default, the Dynamic Audio Normalizer performs "peak"
+	   normalization.  This means that the maximum local gain factor for
+	   each frame is defined (only) by the frame's highest magnitude
+	   sample. This way, the samples can be amplified as much as possible
+	   without exceeding the maximum signal level, i.e. without clipping.
+	   Optionally, however, the Dynamic Audio Normalizer can also take
+	   into account the frame's root mean square, abbreviated RMS. In
+	   electrical engineering, the RMS is commonly used to determine the
+	   power of a time-varying signal. It is therefore considered that the
+	   RMS is a better approximation of the "perceived loudness" than just
+	   looking at the signal's peak magnitude. Consequently, by adjusting
+	   all frames to a constant RMS value, a uniform "perceived loudness"
+	   can be established. If a target RMS value has been specified, a
+	   frame's local gain factor is defined as the factor that would
+	   result in exactly that RMS value.  Note, however, that the maximum
+	   local gain factor is still restricted by the frame's highest
+	   magnitude sample, in order to prevent clipping.
+
+       coupling, n
+	   Enable channels coupling. By default is enabled.  By default, the
+	   Dynamic Audio Normalizer will amplify all channels by the same
+	   amount. This means the same gain factor will be applied to all
+	   channels, i.e.  the maximum possible gain factor is determined by
+	   the "loudest" channel.  However, in some recordings, it may happen
+	   that the volume of the different channels is uneven, e.g. one
+	   channel may be "quieter" than the other one(s).  In this case, this
+	   option can be used to disable the channel coupling. This way, the
+	   gain factor will be determined independently for each channel,
+	   depending only on the individual channel's highest magnitude
+	   sample. This allows for harmonizing the volume of the different
+	   channels.
+
+       correctdc, c
+	   Enable DC bias correction. By default is disabled.  An audio signal
+	   (in the time domain) is a sequence of sample values.  In the
+	   Dynamic Audio Normalizer these sample values are represented in the
+	   -1.0 to 1.0 range, regardless of the original input format.
+	   Normally, the audio signal, or "waveform", should be centered
+	   around the zero point.  That means if we calculate the mean value
+	   of all samples in a file, or in a single frame, then the result
+	   should be 0.0 or at least very close to that value. If, however,
+	   there is a significant deviation of the mean value from 0.0, in
+	   either positive or negative direction, this is referred to as a DC
+	   bias or DC offset. Since a DC bias is clearly undesirable, the
+	   Dynamic Audio Normalizer provides optional DC bias correction.
+	   With DC bias correction enabled, the Dynamic Audio Normalizer will
+	   determine the mean value, or "DC correction" offset, of each input
+	   frame and subtract that value from all of the frame's sample values
+	   which ensures those samples are centered around 0.0 again. Also, in
+	   order to avoid "gaps" at the frame boundaries, the DC correction
+	   offset values will be interpolated smoothly between neighbouring
+	   frames.
+
+       altboundary, b
+	   Enable alternative boundary mode. By default is disabled.  The
+	   Dynamic Audio Normalizer takes into account a certain neighbourhood
+	   around each frame. This includes the preceding frames as well as
+	   the subsequent frames. However, for the "boundary" frames, located
+	   at the very beginning and at the very end of the audio file, not
+	   all neighbouring frames are available. In particular, for the first
+	   few frames in the audio file, the preceding frames are not known.
+	   And, similarly, for the last few frames in the audio file, the
+	   subsequent frames are not known. Thus, the question arises which
+	   gain factors should be assumed for the missing frames in the
+	   "boundary" region. The Dynamic Audio Normalizer implements two
+	   modes to deal with this situation. The default boundary mode
+	   assumes a gain factor of exactly 1.0 for the missing frames,
+	   resulting in a smooth "fade in" and "fade out" at the beginning and
+	   at the end of the input, respectively.
+
+       compress, s
+	   Set the compress factor. In range from 0.0 to 30.0. Default is 0.0.
+	   By default, the Dynamic Audio Normalizer does not apply
+	   "traditional" compression. This means that signal peaks will not be
+	   pruned and thus the full dynamic range will be retained within each
+	   local neighbourhood. However, in some cases it may be desirable to
+	   combine the Dynamic Audio Normalizer's normalization algorithm with
+	   a more "traditional" compression.  For this purpose, the Dynamic
+	   Audio Normalizer provides an optional compression (thresholding)
+	   function. If (and only if) the compression feature is enabled, all
+	   input frames will be processed by a soft knee thresholding function
+	   prior to the actual normalization process. Put simply, the
+	   thresholding function is going to prune all samples whose magnitude
+	   exceeds a certain threshold value.  However, the Dynamic Audio
+	   Normalizer does not simply apply a fixed threshold value. Instead,
+	   the threshold value will be adjusted for each individual frame.  In
+	   general, smaller parameters result in stronger compression, and
+	   vice versa.	Values below 3.0 are not recommended, because audible
+	   distortion may appear.
+
+       threshold, t
+	   Set the target threshold value. This specifies the lowest
+	   permissible magnitude level for the audio input which will be
+	   normalized.	If input frame volume is above this value frame will
+	   be normalized.  Otherwise frame may not be normalized at all. The
+	   default value is set to 0, which means all input frames will be
+	   normalized.	This option is mostly useful if digital noise is not
+	   wanted to be amplified.
+
+       channels, h
+	   Specify which channels to filter, by default all available channels
+	   are filtered.
+
+       overlap, o
+	   Specify overlap for frames. If set to 0 (default) no frame
+	   overlapping is done.  Using >0 and <1 values will make less
+	   conservative gain adjustments, like when framelen option is set to
+	   smaller value, if framelen option value is compensated for non-zero
+	   overlap then gain adjustments will be smoother across time compared
+	   to zero overlap case.
+
+       curve, v
+	   Specify the peak mapping curve expression which is going to be used
+	   when calculating gain applied to frames. The max output frame gain
+	   will still be limited by other options mentioned previously for
+	   this filter.
+
+	   The expression can contain the following constants:
+
+	   ch  current channel number
+
+	   sn  current sample number
+
+	   nb_channels
+	       number of channels
+
+	   t   timestamp expressed in seconds
+
+	   sr  sample rate
+
+	   p   current frame peak value
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   earwax
+       Make audio easier to listen to on headphones.
+
+       This filter adds `cues' to 44.1kHz stereo (i.e. audio CD format) audio
+       so that when listened to on headphones the stereo image is moved from
+       inside your head (standard for headphones) to outside and in front of
+       the listener (standard for speakers).
+
+       Ported from SoX.
+
+   equalizer
+       Apply a two-pole peaking equalisation (EQ) filter. With this filter,
+       the signal-level at and around a selected frequency can be increased or
+       decreased, whilst (unlike bandpass and bandreject filters) that at all
+       other frequencies is unchanged.
+
+       In order to produce complex equalisation curves, this filter can be
+       given several times, each with a different central frequency.
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the filter's central frequency in Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       gain, g
+	   Set the required gain or attenuation in dB.	Beware of clipping
+	   when using a positive gain.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Examples
+
+       o   Attenuate 10 dB at 1000 Hz, with a bandwidth of 200 Hz:
+
+		   equalizer=f=1000:t=h:width=200:g=-10
+
+       o   Apply 2 dB gain at 1000 Hz with Q 1 and attenuate 5 dB at 100 Hz
+	   with Q 2:
+
+		   equalizer=f=1000:t=q:w=1:g=2,equalizer=f=100:t=q:w=2:g=-5
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change equalizer frequency.	Syntax for the command is :
+	   "frequency"
+
+       width_type, t
+	   Change equalizer width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change equalizer width.  Syntax for the command is : "width"
+
+       gain, g
+	   Change equalizer gain.  Syntax for the command is : "gain"
+
+       mix, m
+	   Change equalizer mix.  Syntax for the command is : "mix"
+
+   extrastereo
+       Linearly increases the difference between left and right channels which
+       adds some sort of "live" effect to playback.
+
+       The filter accepts the following options:
+
+       m   Sets the difference coefficient (default: 2.5). 0.0 means mono
+	   sound (average of both channels), with 1.0 sound will be unchanged,
+	   with -1.0 left and right channels will be swapped.
+
+       c   Enable clipping. By default is enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   firequalizer
+       Apply FIR Equalization using arbitrary frequency response.
+
+       The filter accepts the following option:
+
+       gain
+	   Set gain curve equation (in dB). The expression can contain
+	   variables:
+
+	   f   the evaluated frequency
+
+	   sr  sample rate
+
+	   ch  channel number, set to 0 when multichannels evaluation is
+	       disabled
+
+	   chid
+	       channel id, see libavutil/channel_layout.h, set to the first
+	       channel id when multichannels evaluation is disabled
+
+	   chs number of channels
+
+	   chlayout
+	       channel_layout, see libavutil/channel_layout.h
+
+	   and functions:
+
+	   gain_interpolate(f)
+	       interpolate gain on frequency f based on gain_entry
+
+	   cubic_interpolate(f)
+	       same as gain_interpolate, but smoother
+
+	   This option is also available as command. Default is
+	   gain_interpolate(f).
+
+       gain_entry
+	   Set gain entry for gain_interpolate function. The expression can
+	   contain functions:
+
+	   entry(f, g)
+	       store gain entry at frequency f with value g
+
+	   This option is also available as command.
+
+       delay
+	   Set filter delay in seconds. Higher value means more accurate.
+	   Default is 0.01.
+
+       accuracy
+	   Set filter accuracy in Hz. Lower value means more accurate.
+	   Default is 5.
+
+       wfunc
+	   Set window function. Acceptable values are:
+
+	   rectangular
+	       rectangular window, useful when gain curve is already smooth
+
+	   hann
+	       hann window (default)
+
+	   hamming
+	       hamming window
+
+	   blackman
+	       blackman window
+
+	   nuttall3
+	       3-terms continuous 1st derivative nuttall window
+
+	   mnuttall3
+	       minimum 3-terms discontinuous nuttall window
+
+	   nuttall
+	       4-terms continuous 1st derivative nuttall window
+
+	   bnuttall
+	       minimum 4-terms discontinuous nuttall (blackman-nuttall) window
+
+	   bharris
+	       blackman-harris window
+
+	   tukey
+	       tukey window
+
+       fixed
+	   If enabled, use fixed number of audio samples. This improves speed
+	   when filtering with large delay. Default is disabled.
+
+       multi
+	   Enable multichannels evaluation on gain. Default is disabled.
+
+       zero_phase
+	   Enable zero phase mode by subtracting timestamp to compensate
+	   delay.  Default is disabled.
+
+       scale
+	   Set scale used by gain. Acceptable values are:
+
+	   linlin
+	       linear frequency, linear gain
+
+	   linlog
+	       linear frequency, logarithmic (in dB) gain (default)
+
+	   loglin
+	       logarithmic (in octave scale where 20 Hz is 0) frequency,
+	       linear gain
+
+	   loglog
+	       logarithmic frequency, logarithmic gain
+
+       dumpfile
+	   Set file for dumping, suitable for gnuplot.
+
+       dumpscale
+	   Set scale for dumpfile. Acceptable values are same with scale
+	   option.  Default is linlog.
+
+       fft2
+	   Enable 2-channel convolution using complex FFT. This improves speed
+	   significantly.  Default is disabled.
+
+       min_phase
+	   Enable minimum phase impulse response. Default is disabled.
+
+       Examples
+
+       o   lowpass at 1000 Hz:
+
+		   firequalizer=gain='if(lt(f,1000), 0, -INF)'
+
+       o   lowpass at 1000 Hz with gain_entry:
+
+		   firequalizer=gain_entry='entry(1000,0); entry(1001, -INF)'
+
+       o   custom equalization:
+
+		   firequalizer=gain_entry='entry(100,0); entry(400, -4); entry(1000, -6); entry(2000, 0)'
+
+       o   higher delay with zero phase to compensate delay:
+
+		   firequalizer=delay=0.1:fixed=on:zero_phase=on
+
+       o   lowpass on left channel, highpass on right channel:
+
+		   firequalizer=gain='if(eq(chid,1), gain_interpolate(f), if(eq(chid,2), gain_interpolate(1e6+f), 0))'
+		   :gain_entry='entry(1000, 0); entry(1001,-INF); entry(1e6+1000,0)':multi=on
+
+   flanger
+       Apply a flanging effect to the audio.
+
+       The filter accepts the following options:
+
+       delay
+	   Set base delay in milliseconds. Range from 0 to 30. Default value
+	   is 0.
+
+       depth
+	   Set added sweep delay in milliseconds. Range from 0 to 10. Default
+	   value is 2.
+
+       regen
+	   Set percentage regeneration (delayed signal feedback). Range from
+	   -95 to 95.  Default value is 0.
+
+       width
+	   Set percentage of delayed signal mixed with original. Range from 0
+	   to 100.  Default value is 71.
+
+       speed
+	   Set sweeps per second (Hz). Range from 0.1 to 10. Default value is
+	   0.5.
+
+       shape
+	   Set swept wave shape, can be triangular or sinusoidal.  Default
+	   value is sinusoidal.
+
+       phase
+	   Set swept wave percentage-shift for multi channel. Range from 0 to
+	   100.  Default value is 25.
+
+       interp
+	   Set delay-line interpolation, linear or quadratic.  Default is
+	   linear.
+
+   haas
+       Apply Haas effect to audio.
+
+       Note that this makes most sense to apply on mono signals.  With this
+       filter applied to mono signals it give some directionality and
+       stretches its stereo image.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level. By default is 1, or 0dB
+
+       level_out
+	   Set output level. By default is 1, or 0dB.
+
+       side_gain
+	   Set gain applied to side part of signal. By default is 1.
+
+       middle_source
+	   Set kind of middle source. Can be one of the following:
+
+	   left
+	       Pick left channel.
+
+	   right
+	       Pick right channel.
+
+	   mid Pick middle part signal of stereo image.
+
+	   side
+	       Pick side part signal of stereo image.
+
+       middle_phase
+	   Change middle phase. By default is disabled.
+
+       left_delay
+	   Set left channel delay. By default is 2.05 milliseconds.
+
+       left_balance
+	   Set left channel balance. By default is -1.
+
+       left_gain
+	   Set left channel gain. By default is 1.
+
+       left_phase
+	   Change left phase. By default is disabled.
+
+       right_delay
+	   Set right channel delay. By defaults is 2.12 milliseconds.
+
+       right_balance
+	   Set right channel balance. By default is 1.
+
+       right_gain
+	   Set right channel gain. By default is 1.
+
+       right_phase
+	   Change right phase. By default is enabled.
+
+   hdcd
+       Decodes High Definition Compatible Digital (HDCD) data. A 16-bit PCM
+       stream with embedded HDCD codes is expanded into a 20-bit PCM stream.
+
+       The filter supports the Peak Extend and Low-level Gain Adjustment
+       features of HDCD, and detects the Transient Filter flag.
+
+	       ffmpeg -i HDCD16.flac -af hdcd OUT24.flac
+
+       When using the filter with wav, note the default encoding for wav is
+       16-bit, so the resulting 20-bit stream will be truncated back to
+       16-bit. Use something like -acodec pcm_s24le after the filter to get
+       24-bit PCM output.
+
+	       ffmpeg -i HDCD16.wav -af hdcd OUT16.wav
+	       ffmpeg -i HDCD16.wav -af hdcd -c:a pcm_s24le OUT24.wav
+
+       The filter accepts the following options:
+
+       disable_autoconvert
+	   Disable any automatic format conversion or resampling in the filter
+	   graph.
+
+       process_stereo
+	   Process the stereo channels together. If target_gain does not match
+	   between channels, consider it invalid and use the last valid
+	   target_gain.
+
+       cdt_ms
+	   Set the code detect timer period in ms.
+
+       force_pe
+	   Always extend peaks above -3dBFS even if PE isn't signaled.
+
+       analyze_mode
+	   Replace audio with a solid tone and adjust the amplitude to signal
+	   some specific aspect of the decoding process. The output file can
+	   be loaded in an audio editor alongside the original to aid
+	   analysis.
+
+	   "analyze_mode=pe:force_pe=true" can be used to see all samples
+	   above the PE level.
+
+	   Modes are:
+
+	   0, off
+	       Disabled
+
+	   1, lle
+	       Gain adjustment level at each sample
+
+	   2, pe
+	       Samples where peak extend occurs
+
+	   3, cdt
+	       Samples where the code detect timer is active
+
+	   4, tgm
+	       Samples where the target gain does not match between channels
+
+   headphone
+       Apply head-related transfer functions (HRTFs) to create virtual
+       loudspeakers around the user for binaural listening via headphones.
+       The HRIRs are provided via additional streams, for each channel one
+       stereo input stream is needed.
+
+       The filter accepts the following options:
+
+       map Set mapping of input streams for convolution.  The argument is a
+	   '|'-separated list of channel names in order as they are given as
+	   additional stream inputs for filter.  This also specify number of
+	   input streams. Number of input streams must be not less than number
+	   of channels in first stream plus one.
+
+       gain
+	   Set gain applied to audio. Value is in dB. Default is 0.
+
+       type
+	   Set processing type. Can be time or freq. time is processing audio
+	   in time domain which is slow.  freq is processing audio in
+	   frequency domain which is fast.  Default is freq.
+
+       lfe Set custom gain for LFE channels. Value is in dB. Default is 0.
+
+       size
+	   Set size of frame in number of samples which will be processed at
+	   once.  Default value is 1024. Allowed range is from 1024 to 96000.
+
+       hrir
+	   Set format of hrir stream.  Default value is stereo. Alternative
+	   value is multich.  If value is set to stereo, number of additional
+	   streams should be greater or equal to number of input channels in
+	   first input stream.	Also each additional stream should have stereo
+	   number of channels.	If value is set to multich, number of
+	   additional streams should be exactly one. Also number of input
+	   channels of additional stream should be equal or greater than twice
+	   number of channels of first input stream.
+
+       Examples
+
+       o   Full example using wav files as coefficients with amovie filters
+	   for 7.1 downmix, each amovie filter use stereo file with IR
+	   coefficients as input.  The files give coefficients for each
+	   position of virtual loudspeaker:
+
+		   ffmpeg -i input.wav
+		   -filter_complex "amovie=azi_270_ele_0_DFC.wav[sr];amovie=azi_90_ele_0_DFC.wav[sl];amovie=azi_225_ele_0_DFC.wav[br];amovie=azi_135_ele_0_DFC.wav[bl];amovie=azi_0_ele_0_DFC.wav,asplit[fc][lfe];amovie=azi_35_ele_0_DFC.wav[fl];amovie=azi_325_ele_0_DFC.wav[fr];[0:a][fl][fr][fc][lfe][bl][br][sl][sr]headphone=FL|FR|FC|LFE|BL|BR|SL|SR"
+		   output.wav
+
+       o   Full example using wav files as coefficients with amovie filters
+	   for 7.1 downmix, but now in multich hrir format.
+
+		   ffmpeg -i input.wav -filter_complex "amovie=minp.wav[hrirs];[0:a][hrirs]headphone=map=FL|FR|FC|LFE|BL|BR|SL|SR:hrir=multich"
+		   output.wav
+
+   highpass
+       Apply a high-pass filter with 3dB point frequency.  The filter can be
+       either single-pole, or double-pole (the default).  The filter roll off
+       at 6dB per pole per octave (20dB per pole per decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set frequency in Hz. Default is 3000.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.  Applies
+	   only to double-pole filter.	The default is 0.707q and gives a
+	   Butterworth response.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change highpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change highpass width_type.	Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change highpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change highpass mix.  Syntax for the command is : "mix"
+
+   join
+       Join multiple input streams into one multi-channel stream.
+
+       It accepts the following parameters:
+
+       inputs
+	   The number of input streams. It defaults to 2.
+
+       channel_layout
+	   The desired output channel layout. It defaults to stereo.
+
+       map Map channels from inputs to output. The argument is a '|'-separated
+	   list of mappings, each in the "input_idx.in_channel-out_channel"
+	   form. input_idx is the 0-based index of the input stream.
+	   in_channel can be either the name of the input channel (e.g. FL for
+	   front left) or its index in the specified input stream. out_channel
+	   is the name of the output channel.
+
+       The filter will attempt to guess the mappings when they are not
+       specified explicitly. It does so by first trying to find an unused
+       matching input channel and if that fails it picks the first unused
+       input channel.
+
+       Join 3 inputs (with properly set channel layouts):
+
+	       ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex join=inputs=3 OUTPUT
+
+       Build a 5.1 output from 6 single-channel streams:
+
+	       ffmpeg -i fl -i fr -i fc -i sl -i sr -i lfe -filter_complex
+	       'join=inputs=6:channel_layout=5.1:map=0.0-FL|1.0-FR|2.0-FC|3.0-SL|4.0-SR|5.0-LFE'
+	       out
+
+   ladspa
+       Load a LADSPA (Linux Audio Developer's Simple Plugin API) plugin.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-ladspa".
+
+       file, f
+	   Specifies the name of LADSPA plugin library to load. If the
+	   environment variable LADSPA_PATH is defined, the LADSPA plugin is
+	   searched in each one of the directories specified by the colon
+	   separated list in LADSPA_PATH, otherwise in the standard LADSPA
+	   paths, which are in this order: HOME/.ladspa/lib/,
+	   /usr/local/lib/ladspa/, /usr/lib/ladspa/.
+
+       plugin, p
+	   Specifies the plugin within the library. Some libraries contain
+	   only one plugin, but others contain many of them. If this is not
+	   set filter will list all available plugins within the specified
+	   library.
+
+       controls, c
+	   Set the '|' separated list of controls which are zero or more
+	   floating point values that determine the behavior of the loaded
+	   plugin (for example delay, threshold or gain).  Controls need to be
+	   defined using the following syntax:
+	   c0=value0|c1=value1|c2=value2|..., where valuei is the value set on
+	   the i-th control.  Alternatively they can be also defined using the
+	   following syntax: value0|value1|value2|..., where valuei is the
+	   value set on the i-th control.  If controls is set to "help", all
+	   available controls and their valid ranges are printed.
+
+       sample_rate, s
+	   Specify the sample rate, default to 44100. Only used if plugin have
+	   zero inputs.
+
+       nb_samples, n
+	   Set the number of samples per channel per each output frame,
+	   default is 1024. Only used if plugin have zero inputs.
+
+       duration, d
+	   Set the minimum duration of the sourced audio. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  Note that the resulting duration may be greater than the
+	   specified duration, as the generated audio is always cut at the end
+	   of a complete frame.  If not specified, or the expressed duration
+	   is negative, the audio is supposed to be generated forever.	Only
+	   used if plugin have zero inputs.
+
+       latency, l
+	   Enable latency compensation, by default is disabled.  Only used if
+	   plugin have inputs.
+
+       Examples
+
+       o   List all available plugins within amp (LADSPA example plugin)
+	   library:
+
+		   ladspa=file=amp
+
+       o   List all available controls and their valid ranges for "vcf_notch"
+	   plugin from "VCF" library:
+
+		   ladspa=f=vcf:p=vcf_notch:c=help
+
+       o   Simulate low quality audio equipment using "Computer Music Toolkit"
+	   (CMT) plugin library:
+
+		   ladspa=file=cmt:plugin=lofi:controls=c0=22|c1=12|c2=12
+
+       o   Add reverberation to the audio using TAP-plugins (Tom's Audio
+	   Processing plugins):
+
+		   ladspa=file=tap_reverb:tap_reverb
+
+       o   Generate white noise, with 0.2 amplitude:
+
+		   ladspa=file=cmt:noise_source_white:c=c0=.2
+
+       o   Generate 20 bpm clicks using plugin "C* Click - Metronome" from the
+	   "C* Audio Plugin Suite" (CAPS) library:
+
+		   ladspa=file=caps:Click:c=c1=20'
+
+       o   Apply "C* Eq10X2 - Stereo 10-band equaliser" effect:
+
+		   ladspa=caps:Eq10X2:c=c0=-48|c9=-24|c3=12|c4=2
+
+       o   Increase volume by 20dB using fast lookahead limiter from Steve
+	   Harris "SWH Plugins" collection:
+
+		   ladspa=fast_lookahead_limiter_1913:fastLookaheadLimiter:20|0|2
+
+       o   Attenuate low frequencies using Multiband EQ from Steve Harris "SWH
+	   Plugins" collection:
+
+		   ladspa=mbeq_1197:mbeq:-24|-24|-24|0|0|0|0|0|0|0|0|0|0|0|0
+
+       o   Reduce stereo image using "Narrower" from the "C* Audio Plugin
+	   Suite" (CAPS) library:
+
+		   ladspa=caps:Narrower
+
+       o   Another white noise, now using "C* Audio Plugin Suite" (CAPS)
+	   library:
+
+		   ladspa=caps:White:.2
+
+       o   Some fractal noise, using "C* Audio Plugin Suite" (CAPS) library:
+
+		   ladspa=caps:Fractal:c=c1=1
+
+       o   Dynamic volume normalization using "VLevel" plugin:
+
+		   ladspa=vlevel-ladspa:vlevel_mono
+
+       Commands
+
+       This filter supports the following commands:
+
+       cN  Modify the N-th control value.
+
+	   If the specified value is not valid, it is ignored and prior one is
+	   kept.
+
+   loudnorm
+       EBU R128 loudness normalization. Includes both dynamic and linear
+       normalization modes.  Support for both single pass (livestreams, files)
+       and double pass (files) modes.  This algorithm can target IL, LRA, and
+       maximum true peak. In dynamic mode, to accurately detect true peaks,
+       the audio stream will be upsampled to 192 kHz.  Use the "-ar" option or
+       "aresample" filter to explicitly set an output sample rate.
+
+       The filter accepts the following options:
+
+       I, i
+	   Set integrated loudness target.  Range is -70.0 - -5.0. Default
+	   value is -24.0.
+
+       LRA, lra
+	   Set loudness range target.  Range is 1.0 - 50.0. Default value is
+	   7.0.
+
+       TP, tp
+	   Set maximum true peak.  Range is -9.0 - +0.0. Default value is
+	   -2.0.
+
+       measured_I, measured_i
+	   Measured IL of input file.  Range is -99.0 - +0.0.
+
+       measured_LRA, measured_lra
+	   Measured LRA of input file.	Range is  0.0 - 99.0.
+
+       measured_TP, measured_tp
+	   Measured true peak of input file.  Range is	-99.0 - +99.0.
+
+       measured_thresh
+	   Measured threshold of input file.  Range is -99.0 - +0.0.
+
+       offset
+	   Set offset gain. Gain is applied before the true-peak limiter.
+	   Range is  -99.0 - +99.0. Default is +0.0.
+
+       linear
+	   Normalize by linearly scaling the source audio.  "measured_I",
+	   "measured_LRA", "measured_TP", and "measured_thresh" must all be
+	   specified. Target LRA shouldn't be lower than source LRA and the
+	   change in integrated loudness shouldn't result in a true peak which
+	   exceeds the target TP. If any of these conditions aren't met,
+	   normalization mode will revert to dynamic.  Options are "true" or
+	   "false". Default is "true".
+
+       dual_mono
+	   Treat mono input files as "dual-mono". If a mono file is intended
+	   for playback on a stereo system, its EBU R128 measurement will be
+	   perceptually incorrect.  If set to "true", this option will
+	   compensate for this effect.	Multi-channel input files are not
+	   affected by this option.  Options are true or false. Default is
+	   false.
+
+       print_format
+	   Set print format for stats. Options are summary, json, or none.
+	   Default value is none.
+
+   lowpass
+       Apply a low-pass filter with 3dB point frequency.  The filter can be
+       either single-pole or double-pole (the default).  The filter roll off
+       at 6dB per pole per octave (20dB per pole per decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set frequency in Hz. Default is 500.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.  Applies
+	   only to double-pole filter.	The default is 0.707q and gives a
+	   Butterworth response.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Examples
+
+       o   Lowpass only LFE channel, it LFE is not present it does nothing:
+
+		   lowpass=c=LFE
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change lowpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change lowpass width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change lowpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change lowpass mix.	Syntax for the command is : "mix"
+
+   lv2
+       Load a LV2 (LADSPA Version 2) plugin.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-lv2".
+
+       plugin, p
+	   Specifies the plugin URI. You may need to escape ':'.
+
+       controls, c
+	   Set the '|' separated list of controls which are zero or more
+	   floating point values that determine the behavior of the loaded
+	   plugin (for example delay, threshold or gain).  If controls is set
+	   to "help", all available controls and their valid ranges are
+	   printed.
+
+       sample_rate, s
+	   Specify the sample rate, default to 44100. Only used if plugin have
+	   zero inputs.
+
+       nb_samples, n
+	   Set the number of samples per channel per each output frame,
+	   default is 1024. Only used if plugin have zero inputs.
+
+       duration, d
+	   Set the minimum duration of the sourced audio. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  Note that the resulting duration may be greater than the
+	   specified duration, as the generated audio is always cut at the end
+	   of a complete frame.  If not specified, or the expressed duration
+	   is negative, the audio is supposed to be generated forever.	Only
+	   used if plugin have zero inputs.
+
+       Examples
+
+       o   Apply bass enhancer plugin from Calf:
+
+		   lv2=p=http\\\\://calf.sourceforge.net/plugins/BassEnhancer:c=amount=2
+
+       o   Apply vinyl plugin from Calf:
+
+		   lv2=p=http\\\\://calf.sourceforge.net/plugins/Vinyl:c=drone=0.2|aging=0.5
+
+       o   Apply bit crusher plugin from ArtyFX:
+
+		   lv2=p=http\\\\://www.openavproductions.com/artyfx#bitta:c=crush=0.3
+
+       Commands
+
+       This filter supports all options that are exported by plugin as
+       commands.
+
+   mcompand
+       Multiband Compress or expand the audio's dynamic range.
+
+       The input audio is divided into bands using 4th order Linkwitz-Riley
+       IIRs.  This is akin to the crossover of a loudspeaker, and results in
+       flat frequency response when absent compander action.
+
+       It accepts the following parameters:
+
+       args
+	   This option syntax is: attack,decay,[attack,decay..] soft-knee
+	   points crossover_frequency [delay [initial_volume [gain]]] |
+	   attack,decay ...  For explanation of each item refer to compand
+	   filter documentation.
+
+   pan
+       Mix channels with specific gain levels. The filter accepts the output
+       channel layout followed by a set of channels definitions.
+
+       This filter is also designed to efficiently remap the channels of an
+       audio stream.
+
+       The filter accepts parameters of the form: "l|outdef|outdef|..."
+
+       l   output channel layout or number of channels
+
+       outdef
+	   output channel specification, of the form:
+	   "out_name=[gain*]in_name[(+-)[gain*]in_name...]"
+
+       out_name
+	   output channel to define, either a channel name (FL, FR, etc.) or a
+	   channel number (c0, c1, etc.)
+
+       gain
+	   multiplicative coefficient for the channel, 1 leaving the volume
+	   unchanged
+
+       in_name
+	   input channel to use, see out_name for details; it is not possible
+	   to mix named and numbered input channels
+
+       If the `=' in a channel specification is replaced by `<', then the
+       gains for that specification will be renormalized so that the total is
+       1, thus avoiding clipping noise.
+
+       Mixing examples
+
+       For example, if you want to down-mix from stereo to mono, but with a
+       bigger factor for the left channel:
+
+	       pan=1c|c0=0.9*c0+0.1*c1
+
+       A customized down-mix to stereo that works automatically for 3-, 4-, 5-
+       and 7-channels surround:
+
+	       pan=stereo| FL < FL + 0.5*FC + 0.6*BL + 0.6*SL | FR < FR + 0.5*FC + 0.6*BR + 0.6*SR
+
+       Note that ffmpeg integrates a default down-mix (and up-mix) system that
+       should be preferred (see "-ac" option) unless you have very specific
+       needs.
+
+       Remapping examples
+
+       The channel remapping will be effective if, and only if:
+
+       *<gain coefficients are zeroes or ones,>
+       *<only one input per channel output,>
+
+       If all these conditions are satisfied, the filter will notify the user
+       ("Pure channel mapping detected"), and use an optimized and lossless
+       method to do the remapping.
+
+       For example, if you have a 5.1 source and want a stereo audio stream by
+       dropping the extra channels:
+
+	       pan="stereo| c0=FL | c1=FR"
+
+       Given the same source, you can also switch front left and front right
+       channels and keep the input channel layout:
+
+	       pan="5.1| c0=c1 | c1=c0 | c2=c2 | c3=c3 | c4=c4 | c5=c5"
+
+       If the input is a stereo audio stream, you can mute the front left
+       channel (and still keep the stereo channel layout) with:
+
+	       pan="stereo|c1=c1"
+
+       Still with a stereo audio stream input, you can copy the right channel
+       in both front left and right:
+
+	       pan="stereo| c0=FR | c1=FR"
+
+   replaygain
+       ReplayGain scanner filter. This filter takes an audio stream as an
+       input and outputs it unchanged.	At end of filtering it displays
+       "track_gain" and "track_peak".
+
+       The filter accepts the following exported read-only options:
+
+       track_gain
+	   Exported track gain in dB at end of stream.
+
+       track_peak
+	   Exported track peak at end of stream.
+
+   resample
+       Convert the audio sample format, sample rate and channel layout. It is
+       not meant to be used directly.
+
+   rubberband
+       Apply time-stretching and pitch-shifting with librubberband.
+
+       To enable compilation of this filter, you need to configure FFmpeg with
+       "--enable-librubberband".
+
+       The filter accepts the following options:
+
+       tempo
+	   Set tempo scale factor.
+
+       pitch
+	   Set pitch scale factor.
+
+       transients
+	   Set transients detector.  Possible values are:
+
+	   crisp
+	   mixed
+	   smooth
+       detector
+	   Set detector.  Possible values are:
+
+	   compound
+	   percussive
+	   soft
+       phase
+	   Set phase.  Possible values are:
+
+	   laminar
+	   independent
+       window
+	   Set processing window size.	Possible values are:
+
+	   standard
+	   short
+	   long
+       smoothing
+	   Set smoothing.  Possible values are:
+
+	   off
+	   on
+       formant
+	   Enable formant preservation when shift pitching.  Possible values
+	   are:
+
+	   shifted
+	   preserved
+       pitchq
+	   Set pitch quality.  Possible values are:
+
+	   quality
+	   speed
+	   consistency
+       channels
+	   Set channels.  Possible values are:
+
+	   apart
+	   together
+
+       Commands
+
+       This filter supports the following commands:
+
+       tempo
+	   Change filter tempo scale factor.  Syntax for the command is :
+	   "tempo"
+
+       pitch
+	   Change filter pitch scale factor.  Syntax for the command is :
+	   "pitch"
+
+   sidechaincompress
+       This filter acts like normal compressor but has the ability to compress
+       detected signal using second input signal.  It needs two input streams
+       and returns one output stream.  First input stream will be processed
+       depending on second stream signal.  The filtered signal then can be
+       filtered with other filters in later stages of processing. See pan and
+       amerge filter.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. Default is 1. Range is between 0.015625 and 64.
+
+       mode
+	   Set mode of compressor operation. Can be "upward" or "downward".
+	   Default is "downward".
+
+       threshold
+	   If a signal of second stream raises above this level it will affect
+	   the gain reduction of first stream.	By default is 0.125. Range is
+	   between 0.00097563 and 1.
+
+       ratio
+	   Set a ratio about which the signal is reduced. 1:2 means that if
+	   the level raised 4dB above the threshold, it will be only 2dB above
+	   after the reduction.  Default is 2. Range is between 1 and 20.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction starts. Default is 20. Range is between 0.01
+	   and 2000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before reduction is decreased again. Default is 250. Range is
+	   between 0.01 and 9000.
+
+       makeup
+	   Set the amount by how much signal will be amplified after
+	   processing.	Default is 1. Range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.82843. Range is between 1 and 8.
+
+       link
+	   Choose if the "average" level between all channels of side-chain
+	   stream or the louder("maximum") channel of side-chain stream
+	   affects the reduction. Default is "average".
+
+       detection
+	   Should the exact signal be taken in case of "peak" or an RMS one in
+	   case of "rms". Default is "rms" which is mainly smoother.
+
+       level_sc
+	   Set sidechain gain. Default is 1. Range is between 0.015625 and 64.
+
+       mix How much to use compressed signal in output. Default is 1.  Range
+	   is between 0 and 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Full ffmpeg example taking 2 audio inputs, 1st input to be
+	   compressed depending on the signal of 2nd input and later
+	   compressed signal to be merged with 2nd input:
+
+		   ffmpeg -i main.flac -i sidechain.flac -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress[compr];[compr][mix]amerge"
+
+   sidechaingate
+       A sidechain gate acts like a normal (wideband) gate but has the ability
+       to filter the detected signal before sending it to the gain reduction
+       stage.  Normally a gate uses the full range signal to detect a level
+       above the threshold.  For example: If you cut all lower frequencies
+       from your sidechain signal the gate will decrease the volume of your
+       track only if not enough highs appear. With this technique you are able
+       to reduce the resonation of a natural drum or remove "rumbling" of
+       muted strokes from a heavily distorted guitar.  It needs two input
+       streams and returns one output stream.  First input stream will be
+       processed depending on second stream signal.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level before filtering.  Default is 1. Allowed range is
+	   from 0.015625 to 64.
+
+       mode
+	   Set the mode of operation. Can be "upward" or "downward".  Default
+	   is "downward". If set to "upward" mode, higher parts of signal will
+	   be amplified, expanding dynamic range in upward direction.
+	   Otherwise, in case of "downward" lower parts of signal will be
+	   reduced.
+
+       range
+	   Set the level of gain reduction when the signal is below the
+	   threshold.  Default is 0.06125. Allowed range is from 0 to 1.
+	   Setting this to 0 disables reduction and then filter behaves like
+	   expander.
+
+       threshold
+	   If a signal rises above this level the gain reduction is released.
+	   Default is 0.125. Allowed range is from 0 to 1.
+
+       ratio
+	   Set a ratio about which the signal is reduced.  Default is 2.
+	   Allowed range is from 1 to 9000.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction stops.  Default is 20 milliseconds. Allowed
+	   range is from 0.01 to 9000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before the reduction is increased again. Default is 250
+	   milliseconds.  Allowed range is from 0.01 to 9000.
+
+       makeup
+	   Set amount of amplification of signal after processing.  Default is
+	   1. Allowed range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.828427125. Allowed range is from 1 to 8.
+
+       detection
+	   Choose if exact signal should be taken for detection or an RMS like
+	   one.  Default is rms. Can be peak or rms.
+
+       link
+	   Choose if the average level between all channels or the louder
+	   channel affects the reduction.  Default is average. Can be average
+	   or maximum.
+
+       level_sc
+	   Set sidechain gain. Default is 1. Range is from 0.015625 to 64.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   silencedetect
+       Detect silence in an audio stream.
+
+       This filter logs a message when it detects that the input audio volume
+       is less or equal to a noise tolerance value for a duration greater or
+       equal to the minimum detected noise duration.
+
+       The printed times and duration are expressed in seconds. The
+       "lavfi.silence_start" or "lavfi.silence_start.X" metadata key is set on
+       the first frame whose timestamp equals or exceeds the detection
+       duration and it contains the timestamp of the first frame of the
+       silence.
+
+       The "lavfi.silence_duration" or "lavfi.silence_duration.X" and
+       "lavfi.silence_end" or "lavfi.silence_end.X" metadata keys are set on
+       the first frame after the silence. If mono is enabled, and each channel
+       is evaluated separately, the ".X" suffixed keys are used, and "X"
+       corresponds to the channel number.
+
+       The filter accepts the following options:
+
+       noise, n
+	   Set noise tolerance. Can be specified in dB (in case "dB" is
+	   appended to the specified value) or amplitude ratio. Default is
+	   -60dB, or 0.001.
+
+       duration, d
+	   Set silence duration until notification (default is 2 seconds). See
+	   the Time duration section in the ffmpeg-utils(1) manual for the
+	   accepted syntax.
+
+       mono, m
+	   Process each channel separately, instead of combined. By default is
+	   disabled.
+
+       Examples
+
+       o   Detect 5 seconds of silence with -50dB noise tolerance:
+
+		   silencedetect=n=-50dB:d=5
+
+       o   Complete example with ffmpeg to detect silence with 0.0001 noise
+	   tolerance in silence.mp3:
+
+		   ffmpeg -i silence.mp3 -af silencedetect=noise=0.0001 -f null -
+
+   silenceremove
+       Remove silence from the beginning, middle or end of the audio.
+
+       The filter accepts the following options:
+
+       start_periods
+	   This value is used to indicate if audio should be trimmed at
+	   beginning of the audio. A value of zero indicates no silence should
+	   be trimmed from the beginning. When specifying a non-zero value, it
+	   trims audio up until it finds non-silence. Normally, when trimming
+	   silence from beginning of audio the start_periods will be 1 but it
+	   can be increased to higher values to trim all audio up to specific
+	   count of non-silence periods.  Default value is 0.
+
+       start_duration
+	   Specify the amount of time that non-silence must be detected before
+	   it stops trimming audio. By increasing the duration, bursts of
+	   noises can be treated as silence and trimmed off. Default value is
+	   0.
+
+       start_threshold
+	   This indicates what sample value should be treated as silence. For
+	   digital audio, a value of 0 may be fine but for audio recorded from
+	   analog, you may wish to increase the value to account for
+	   background noise.  Can be specified in dB (in case "dB" is appended
+	   to the specified value) or amplitude ratio. Default value is 0.
+
+       start_silence
+	   Specify max duration of silence at beginning that will be kept
+	   after trimming. Default is 0, which is equal to trimming all
+	   samples detected as silence.
+
+       start_mode
+	   Specify mode of detection of silence end at start of multi-channel
+	   audio.  Can be any or all. Default is any.  With any, any sample
+	   from any channel that is detected as non-silence will trigger end
+	   of silence trimming at start of audio stream.  With all, only if
+	   every sample from every channel is detected as non-silence will
+	   trigger end of silence trimming at start of audio stream, limited
+	   usage.
+
+       stop_periods
+	   Set the count for trimming silence from the end of audio. When
+	   specifying a positive value, it trims audio after it finds
+	   specified silence period.  To remove silence from the middle of a
+	   file, specify a stop_periods that is negative. This value is then
+	   treated as a positive value and is used to indicate the effect
+	   should restart processing as specified by stop_periods, making it
+	   suitable for removing periods of silence in the middle of the
+	   audio.  Default value is 0.
+
+       stop_duration
+	   Specify a duration of silence that must exist before audio is not
+	   copied any more. By specifying a higher duration, silence that is
+	   wanted can be left in the audio.  Default value is 0.
+
+       stop_threshold
+	   This is the same as start_threshold but for trimming silence from
+	   the end of audio.  Can be specified in dB (in case "dB" is appended
+	   to the specified value) or amplitude ratio. Default value is 0.
+
+       stop_silence
+	   Specify max duration of silence at end that will be kept after
+	   trimming. Default is 0, which is equal to trimming all samples
+	   detected as silence.
+
+       stop_mode
+	   Specify mode of detection of silence start after start of multi-
+	   channel audio.  Can be any or all. Default is all.  With any, any
+	   sample from any channel that is detected as silence will trigger
+	   start of silence trimming after start of audio stream, limited
+	   usage.  With all, only if every sample from every channel is
+	   detected as silence will trigger start of silence trimming after
+	   start of audio stream.
+
+       detection
+	   Set how is silence detected.
+
+	   avg Mean of absolute values of samples in moving window.
+
+	   rms Root squared mean of absolute values of samples in moving
+	       window.
+
+	   peak
+	       Maximum of absolute values of samples in moving window.
+
+	   median
+	       Median of absolute values of samples in moving window.
+
+	   ptp Absolute of max peak to min peak difference of samples in
+	       moving window.
+
+	   dev Standard deviation of values of samples in moving window.
+
+	   Default value is "rms".
+
+       window
+	   Set duration in number of seconds used to calculate size of window
+	   in number of samples for detecting silence. Using 0 will
+	   effectively disable any windowing and use only single sample per
+	   channel for silence detection.  In that case it may be needed to
+	   also set start_silence and/or stop_silence to nonzero values with
+	   also start_duration and/or stop_duration to nonzero values.
+	   Default value is 0.02. Allowed range is from 0 to 10.
+
+       timestamp
+	   Set processing mode of every audio frame output timestamp.
+
+	   write
+	       Full timestamps rewrite, keep only the start time for the first
+	       output frame.
+
+	   copy
+	       Non-dropped frames are left with same timestamp as input audio
+	       frame.
+
+	   Defaults value is "write".
+
+       Examples
+
+       o   The following example shows how this filter can be used to start a
+	   recording that does not contain the delay at the start which
+	   usually occurs between pressing the record button and the start of
+	   the performance:
+
+		   silenceremove=start_periods=1:start_duration=5:start_threshold=0.02
+
+       o   Trim all silence encountered from beginning to end where there is
+	   more than 1 second of silence in audio:
+
+		   silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-90dB
+
+       o   Trim all digital silence samples, using peak detection, from
+	   beginning to end where there is more than 0 samples of digital
+	   silence in audio and digital silence is detected in all channels at
+	   same positions in stream:
+
+		   silenceremove=window=0:detection=peak:stop_mode=all:start_mode=all:stop_periods=-1:stop_threshold=0
+
+       o   Trim every 2nd encountered silence period from beginning to end
+	   where there is more than 1 second of silence per silence period in
+	   audio:
+
+		   silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB
+
+       o   Similar as above, but keep maximum of 0.5 seconds of silence from
+	   each trimmed period:
+
+		   silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB:stop_silence=0.5
+
+       o   Similar as above, but keep maximum of 1.5 seconds of silence from
+	   start of audio:
+
+		   silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB:stop_silence=0.5:start_periods=1:start_duration=1:start_silence=1.5:stop_threshold=-90dB
+
+       Commands
+
+       This filter supports some above options as commands.
+
+   sofalizer
+       SOFAlizer uses head-related transfer functions (HRTFs) to create
+       virtual loudspeakers around the user for binaural listening via
+       headphones (audio formats up to 9 channels supported).  The HRTFs are
+       stored in SOFA files (see <http://www.sofacoustics.org/> for a
+       database).  SOFAlizer is developed at the Acoustics Research Institute
+       (ARI) of the Austrian Academy of Sciences.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libmysofa".
+
+       The filter accepts the following options:
+
+       sofa
+	   Set the SOFA file used for rendering.
+
+       gain
+	   Set gain applied to audio. Value is in dB. Default is 0.
+
+       rotation
+	   Set rotation of virtual loudspeakers in deg. Default is 0.
+
+       elevation
+	   Set elevation of virtual speakers in deg. Default is 0.
+
+       radius
+	   Set distance in meters between loudspeakers and the listener with
+	   near-field HRTFs. Default is 1.
+
+       type
+	   Set processing type. Can be time or freq. time is processing audio
+	   in time domain which is slow.  freq is processing audio in
+	   frequency domain which is fast.  Default is freq.
+
+       speakers
+	   Set custom positions of virtual loudspeakers. Syntax for this
+	   option is: <CH> <AZIM> <ELEV>[|<CH> <AZIM> <ELEV>|...].  Each
+	   virtual loudspeaker is described with short channel name following
+	   with azimuth and elevation in degrees.  Each virtual loudspeaker
+	   description is separated by '|'.  For example to override front
+	   left and front right channel positions use: 'speakers=FL 45 15|FR
+	   345 15'.  Descriptions with unrecognised channel names are ignored.
+
+       lfegain
+	   Set custom gain for LFE channels. Value is in dB. Default is 0.
+
+       framesize
+	   Set custom frame size in number of samples. Default is 1024.
+	   Allowed range is from 1024 to 96000. Only used if option type is
+	   set to freq.
+
+       normalize
+	   Should all IRs be normalized upon importing SOFA file.  By default
+	   is enabled.
+
+       interpolate
+	   Should nearest IRs be interpolated with neighbor IRs if exact
+	   position does not match. By default is disabled.
+
+       minphase
+	   Minphase all IRs upon loading of SOFA file. By default is disabled.
+
+       anglestep
+	   Set neighbor search angle step. Only used if option interpolate is
+	   enabled.
+
+       radstep
+	   Set neighbor search radius step. Only used if option interpolate is
+	   enabled.
+
+       Examples
+
+       o   Using ClubFritz6 sofa file:
+
+		   sofalizer=sofa=/path/to/ClubFritz6.sofa:type=freq:radius=1
+
+       o   Using ClubFritz12 sofa file and bigger radius with small rotation:
+
+		   sofalizer=sofa=/path/to/ClubFritz12.sofa:type=freq:radius=2:rotation=5
+
+       o   Similar as above but with custom speaker positions for front left,
+	   front right, back left and back right and also with custom gain:
+
+		   "sofalizer=sofa=/path/to/ClubFritz6.sofa:type=freq:radius=2:speakers=FL 45|FR 315|BL 135|BR 225:gain=28"
+
+   speechnorm
+       Speech Normalizer.
+
+       This filter expands or compresses each half-cycle of audio samples
+       (local set of samples all above or all below zero and between two
+       nearest zero crossings) depending on threshold value, so audio reaches
+       target peak value under conditions controlled by below options.
+
+       The filter accepts the following options:
+
+       peak, p
+	   Set the expansion target peak value. This specifies the highest
+	   allowed absolute amplitude level for the normalized audio input.
+	   Default value is 0.95. Allowed range is from 0.0 to 1.0.
+
+       expansion, e
+	   Set the maximum expansion factor. Allowed range is from 1.0 to
+	   50.0. Default value is 2.0.	This option controls maximum local
+	   half-cycle of samples expansion. The maximum expansion would be
+	   such that local peak value reaches target peak value but never to
+	   surpass it and that ratio between new and previous peak value does
+	   not surpass this option value.
+
+       compression, c
+	   Set the maximum compression factor. Allowed range is from 1.0 to
+	   50.0. Default value is 2.0.	This option controls maximum local
+	   half-cycle of samples compression. This option is used only if
+	   threshold option is set to value greater than 0.0, then in such
+	   cases when local peak is lower or same as value set by threshold
+	   all samples belonging to that peak's half-cycle will be compressed
+	   by current compression factor.
+
+       threshold, t
+	   Set the threshold value. Default value is 0.0. Allowed range is
+	   from 0.0 to 1.0.  This option specifies which half-cycles of
+	   samples will be compressed and which will be expanded.  Any half-
+	   cycle samples with their local peak value below or same as this
+	   option value will be compressed by current compression factor,
+	   otherwise, if greater than threshold value they will be expanded
+	   with expansion factor so that it could reach peak target value but
+	   never surpass it.
+
+       raise, r
+	   Set the expansion raising amount per each half-cycle of samples.
+	   Default value is 0.001.  Allowed range is from 0.0 to 1.0. This
+	   controls how fast expansion factor is raised per each new half-
+	   cycle until it reaches expansion value.  Setting this options too
+	   high may lead to distortions.
+
+       fall, f
+	   Set the compression raising amount per each half-cycle of samples.
+	   Default value is 0.001.  Allowed range is from 0.0 to 1.0. This
+	   controls how fast compression factor is raised per each new half-
+	   cycle until it reaches compression value.
+
+       channels, h
+	   Specify which channels to filter, by default all available channels
+	   are filtered.
+
+       invert, i
+	   Enable inverted filtering, by default is disabled. This inverts
+	   interpretation of threshold option. When enabled any half-cycle of
+	   samples with their local peak value below or same as threshold
+	   option will be expanded otherwise it will be compressed.
+
+       link, l
+	   Link channels when calculating gain applied to each filtered
+	   channel sample, by default is disabled.  When disabled each
+	   filtered channel gain calculation is independent, otherwise when
+	   this option is enabled the minimum of all possible gains for each
+	   filtered channel is used.
+
+       rms, m
+	   Set the expansion target RMS value. This specifies the highest
+	   allowed RMS level for the normalized audio input. Default value is
+	   0.0, thus disabled. Allowed range is from 0.0 to 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Weak and slow amplification:
+
+		   speechnorm=e=3:r=0.00001:l=1
+
+       o   Moderate and slow amplification:
+
+		   speechnorm=e=6.25:r=0.00001:l=1
+
+       o   Strong and fast amplification:
+
+		   speechnorm=e=12.5:r=0.0001:l=1
+
+       o   Very strong and fast amplification:
+
+		   speechnorm=e=25:r=0.0001:l=1
+
+       o   Extreme and fast amplification:
+
+		   speechnorm=e=50:r=0.0001:l=1
+
+   stereotools
+       This filter has some handy utilities to manage stereo signals, for
+       converting M/S stereo recordings to L/R signal while having control
+       over the parameters or spreading the stereo image of master track.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level before filtering for both channels. Defaults is 1.
+	   Allowed range is from 0.015625 to 64.
+
+       level_out
+	   Set output level after filtering for both channels. Defaults is 1.
+	   Allowed range is from 0.015625 to 64.
+
+       balance_in
+	   Set input balance between both channels. Default is 0.  Allowed
+	   range is from -1 to 1.
+
+       balance_out
+	   Set output balance between both channels. Default is 0.  Allowed
+	   range is from -1 to 1.
+
+       softclip
+	   Enable softclipping. Results in analog distortion instead of harsh
+	   digital 0dB clipping. Disabled by default.
+
+       mutel
+	   Mute the left channel. Disabled by default.
+
+       muter
+	   Mute the right channel. Disabled by default.
+
+       phasel
+	   Change the phase of the left channel. Disabled by default.
+
+       phaser
+	   Change the phase of the right channel. Disabled by default.
+
+       mode
+	   Set stereo mode. Available values are:
+
+	   lr>lr
+	       Left/Right to Left/Right, this is default.
+
+	   lr>ms
+	       Left/Right to Mid/Side.
+
+	   ms>lr
+	       Mid/Side to Left/Right.
+
+	   lr>ll
+	       Left/Right to Left/Left.
+
+	   lr>rr
+	       Left/Right to Right/Right.
+
+	   lr>l+r
+	       Left/Right to Left + Right.
+
+	   lr>rl
+	       Left/Right to Right/Left.
+
+	   ms>ll
+	       Mid/Side to Left/Left.
+
+	   ms>rr
+	       Mid/Side to Right/Right.
+
+	   ms>rl
+	       Mid/Side to Right/Left.
+
+	   lr>l-r
+	       Left/Right to Left - Right.
+
+       slev
+	   Set level of side signal. Default is 1.  Allowed range is from
+	   0.015625 to 64.
+
+       sbal
+	   Set balance of side signal. Default is 0.  Allowed range is from -1
+	   to 1.
+
+       mlev
+	   Set level of the middle signal. Default is 1.  Allowed range is
+	   from 0.015625 to 64.
+
+       mpan
+	   Set middle signal pan. Default is 0. Allowed range is from -1 to 1.
+
+       base
+	   Set stereo base between mono and inversed channels. Default is 0.
+	   Allowed range is from -1 to 1.
+
+       delay
+	   Set delay in milliseconds how much to delay left from right channel
+	   and vice versa. Default is 0. Allowed range is from -20 to 20.
+
+       sclevel
+	   Set S/C level. Default is 1. Allowed range is from 1 to 100.
+
+       phase
+	   Set the stereo phase in degrees. Default is 0. Allowed range is
+	   from 0 to 360.
+
+       bmode_in, bmode_out
+	   Set balance mode for balance_in/balance_out option.
+
+	   Can be one of the following:
+
+	   balance
+	       Classic balance mode. Attenuate one channel at time.  Gain is
+	       raised up to 1.
+
+	   amplitude
+	       Similar as classic mode above but gain is raised up to 2.
+
+	   power
+	       Equal power distribution, from -6dB to +6dB range.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Apply karaoke like effect:
+
+		   stereotools=mlev=0.015625
+
+       o   Convert M/S signal to L/R:
+
+		   "stereotools=mode=ms>lr"
+
+   stereowiden
+       This filter enhance the stereo effect by suppressing signal common to
+       both channels and by delaying the signal of left into right and vice
+       versa, thereby widening the stereo effect.
+
+       The filter accepts the following options:
+
+       delay
+	   Time in milliseconds of the delay of left signal into right and
+	   vice versa.	Default is 20 milliseconds.
+
+       feedback
+	   Amount of gain in delayed signal into right and vice versa. Gives a
+	   delay effect of left signal in right output and vice versa which
+	   gives widening effect. Default is 0.3.
+
+       crossfeed
+	   Cross feed of left into right with inverted phase. This helps in
+	   suppressing the mono. If the value is 1 it will cancel all the
+	   signal common to both channels. Default is 0.3.
+
+       drymix
+	   Set level of input signal of original channel. Default is 0.8.
+
+       Commands
+
+       This filter supports the all above options except "delay" as commands.
+
+   superequalizer
+       Apply 18 band equalizer.
+
+       The filter accepts the following options:
+
+       1b  Set 65Hz band gain.
+
+       2b  Set 92Hz band gain.
+
+       3b  Set 131Hz band gain.
+
+       4b  Set 185Hz band gain.
+
+       5b  Set 262Hz band gain.
+
+       6b  Set 370Hz band gain.
+
+       7b  Set 523Hz band gain.
+
+       8b  Set 740Hz band gain.
+
+       9b  Set 1047Hz band gain.
+
+       10b Set 1480Hz band gain.
+
+       11b Set 2093Hz band gain.
+
+       12b Set 2960Hz band gain.
+
+       13b Set 4186Hz band gain.
+
+       14b Set 5920Hz band gain.
+
+       15b Set 8372Hz band gain.
+
+       16b Set 11840Hz band gain.
+
+       17b Set 16744Hz band gain.
+
+       18b Set 20000Hz band gain.
+
+   surround
+       Apply audio surround upmix filter.
+
+       This filter allows to produce multichannel output from audio stream.
+
+       The filter accepts the following options:
+
+       chl_out
+	   Set output channel layout. By default, this is 5.1.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       chl_in
+	   Set input channel layout. By default, this is stereo.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       level_in
+	   Set input volume level. By default, this is 1.
+
+       level_out
+	   Set output volume level. By default, this is 1.
+
+       lfe Enable LFE channel output if output channel layout has it. By
+	   default, this is enabled.
+
+       lfe_low
+	   Set LFE low cut off frequency. By default, this is 128 Hz.
+
+       lfe_high
+	   Set LFE high cut off frequency. By default, this is 256 Hz.
+
+       lfe_mode
+	   Set LFE mode, can be add or sub. Default is add.  In add mode, LFE
+	   channel is created from input audio and added to output.  In sub
+	   mode, LFE channel is created from input audio and added to output
+	   but also all non-LFE output channels are subtracted with output LFE
+	   channel.
+
+       smooth
+	   Set temporal smoothness strength, used to gradually change factors
+	   when transforming stereo sound in time. Allowed range is from 0.0
+	   to 1.0.  Useful to improve output quality with focus option values
+	   greater than 0.0.  Default is 0.0. Only values inside this range
+	   and without edges are effective.
+
+       angle
+	   Set angle of stereo surround transform, Allowed range is from 0 to
+	   360.  Default is 90.
+
+       focus
+	   Set focus of stereo surround transform, Allowed range is from -1 to
+	   1.  Default is 0.
+
+       fc_in
+	   Set front center input volume. By default, this is 1.
+
+       fc_out
+	   Set front center output volume. By default, this is 1.
+
+       fl_in
+	   Set front left input volume. By default, this is 1.
+
+       fl_out
+	   Set front left output volume. By default, this is 1.
+
+       fr_in
+	   Set front right input volume. By default, this is 1.
+
+       fr_out
+	   Set front right output volume. By default, this is 1.
+
+       sl_in
+	   Set side left input volume. By default, this is 1.
+
+       sl_out
+	   Set side left output volume. By default, this is 1.
+
+       sr_in
+	   Set side right input volume. By default, this is 1.
+
+       sr_out
+	   Set side right output volume. By default, this is 1.
+
+       bl_in
+	   Set back left input volume. By default, this is 1.
+
+       bl_out
+	   Set back left output volume. By default, this is 1.
+
+       br_in
+	   Set back right input volume. By default, this is 1.
+
+       br_out
+	   Set back right output volume. By default, this is 1.
+
+       bc_in
+	   Set back center input volume. By default, this is 1.
+
+       bc_out
+	   Set back center output volume. By default, this is 1.
+
+       lfe_in
+	   Set LFE input volume. By default, this is 1.
+
+       lfe_out
+	   Set LFE output volume. By default, this is 1.
+
+       allx
+	   Set spread usage of stereo image across X axis for all channels.
+	   Allowed range is from -1 to 15.  By default this value is negative
+	   -1, and thus unused.
+
+       ally
+	   Set spread usage of stereo image across Y axis for all channels.
+	   Allowed range is from -1 to 15.  By default this value is negative
+	   -1, and thus unused.
+
+       fcx, flx, frx, blx, brx, slx, srx, bcx
+	   Set spread usage of stereo image across X axis for each channel.
+	   Allowed range is from 0.06 to 15.  By default this value is 0.5.
+
+       fcy, fly, fry, bly, bry, sly, sry, bcy
+	   Set spread usage of stereo image across Y axis for each channel.
+	   Allowed range is from 0.06 to 15.  By default this value is 0.5.
+
+       win_size
+	   Set window size. Allowed range is from 1024 to 65536. Default size
+	   is 4096.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann, hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hann".
+
+       overlap
+	   Set window overlap. If set to 1, the recommended overlap for
+	   selected window function will be picked. Default is 0.5.
+
+   tiltshelf
+       Boost or cut the lower frequencies and cut or boost higher frequencies
+       of the audio using a two-pole shelving filter with a response similar
+       to that of a standard hi-fi's tone-controls.  This is also known as
+       shelving equalisation (EQ).
+
+       The filter accepts the following options:
+
+       gain, g
+	   Give the gain at 0 Hz. Its useful range is about -20 (for a large
+	   cut) to +20 (for a large boost).  Beware of clipping when using a
+	   positive gain.
+
+       frequency, f
+	   Set the filter's central frequency and so can be used to extend or
+	   reduce the frequency range to be boosted or cut.  The default value
+	   is 3000 Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Determine how steep is the filter's shelf transition.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports some options as commands.
+
+   treble, highshelf
+       Boost or cut treble (upper) frequencies of the audio using a two-pole
+       shelving filter with a response similar to that of a standard hi-fi's
+       tone-controls. This is also known as shelving equalisation (EQ).
+
+       The filter accepts the following options:
+
+       gain, g
+	   Give the gain at whichever is the lower of ~22 kHz and the Nyquist
+	   frequency. Its useful range is about -20 (for a large cut) to +20
+	   (for a large boost). Beware of clipping when using a positive gain.
+
+       frequency, f
+	   Set the filter's central frequency and so can be used to extend or
+	   reduce the frequency range to be boosted or cut.  The default value
+	   is 3000 Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Determine how steep is the filter's shelf transition.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change treble frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change treble width_type.  Syntax for the command is : "width_type"
+
+       width, w
+	   Change treble width.  Syntax for the command is : "width"
+
+       gain, g
+	   Change treble gain.	Syntax for the command is : "gain"
+
+       mix, m
+	   Change treble mix.  Syntax for the command is : "mix"
+
+   tremolo
+       Sinusoidal amplitude modulation.
+
+       The filter accepts the following options:
+
+       f   Modulation frequency in Hertz. Modulation frequencies in the
+	   subharmonic range (20 Hz or lower) will result in a tremolo effect.
+	   This filter may also be used as a ring modulator by specifying a
+	   modulation frequency higher than 20 Hz.  Range is 0.1 - 20000.0.
+	   Default value is 5.0 Hz.
+
+       d   Depth of modulation as a percentage. Range is 0.0 - 1.0.  Default
+	   value is 0.5.
+
+   vibrato
+       Sinusoidal phase modulation.
+
+       The filter accepts the following options:
+
+       f   Modulation frequency in Hertz.  Range is 0.1 - 20000.0. Default
+	   value is 5.0 Hz.
+
+       d   Depth of modulation as a percentage. Range is 0.0 - 1.0.  Default
+	   value is 0.5.
+
+   virtualbass
+       Apply audio Virtual Bass filter.
+
+       This filter accepts stereo input and produce stereo with LFE (2.1)
+       channels output.  The newly produced LFE channel have enhanced virtual
+       bass originally obtained from both stereo channels.  This filter
+       outputs front left and front right channels unchanged as available in
+       stereo input.
+
+       The filter accepts the following options:
+
+       cutoff
+	   Set the virtual bass cutoff frequency. Default value is 250 Hz.
+	   Allowed range is from 100 to 500 Hz.
+
+       strength
+	   Set the virtual bass strength. Allowed range is from 0.5 to 3.
+	   Default value is 3.
+
+   volume
+       Adjust the input audio volume.
+
+       It accepts the following parameters:
+
+       volume
+	   Set audio volume expression.
+
+	   Output values are clipped to the maximum value.
+
+	   The output audio volume is given by the relation:
+
+		   <output_volume> = <volume> * <input_volume>
+
+	   The default value for volume is "1.0".
+
+       precision
+	   This parameter represents the mathematical precision.
+
+	   It determines which input sample formats will be allowed, which
+	   affects the precision of the volume scaling.
+
+	   fixed
+	       8-bit fixed-point; this limits input sample format to U8, S16,
+	       and S32.
+
+	   float
+	       32-bit floating-point; this limits input sample format to FLT.
+	       (default)
+
+	   double
+	       64-bit floating-point; this limits input sample format to DBL.
+
+       replaygain
+	   Choose the behaviour on encountering ReplayGain side data in input
+	   frames.
+
+	   drop
+	       Remove ReplayGain side data, ignoring its contents (the
+	       default).
+
+	   ignore
+	       Ignore ReplayGain side data, but leave it in the frame.
+
+	   track
+	       Prefer the track gain, if present.
+
+	   album
+	       Prefer the album gain, if present.
+
+       replaygain_preamp
+	   Pre-amplification gain in dB to apply to the selected replaygain
+	   gain.
+
+	   Default value for replaygain_preamp is 0.0.
+
+       replaygain_noclip
+	   Prevent clipping by limiting the gain applied.
+
+	   Default value for replaygain_noclip is 1.
+
+       eval
+	   Set when the volume expression is evaluated.
+
+	   It accepts the following values:
+
+	   once
+	       only evaluate expression once during the filter initialization,
+	       or when the volume command is sent
+
+	   frame
+	       evaluate expression for each incoming frame
+
+	   Default value is once.
+
+       The volume expression can contain the following parameters.
+
+       n   frame number (starting at zero)
+
+       nb_channels
+	   number of channels
+
+       nb_consumed_samples
+	   number of samples consumed by the filter
+
+       nb_samples
+	   number of samples in the current frame
+
+       pos original frame position in the file; deprecated, do not use
+
+       pts frame PTS
+
+       sample_rate
+	   sample rate
+
+       startpts
+	   PTS at start of stream
+
+       startt
+	   time at start of stream
+
+       t   frame time
+
+       tb  timestamp timebase
+
+       volume
+	   last set volume value
+
+       Note that when eval is set to once only the sample_rate and tb
+       variables are available, all other variables will evaluate to NAN.
+
+       Commands
+
+       This filter supports the following commands:
+
+       volume
+	   Modify the volume expression.  The command accepts the same syntax
+	   of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+       Examples
+
+       o   Halve the input audio volume:
+
+		   volume=volume=0.5
+		   volume=volume=1/2
+		   volume=volume=-6.0206dB
+
+	   In all the above example the named key for volume can be omitted,
+	   for example like in:
+
+		   volume=0.5
+
+       o   Increase input audio power by 6 decibels using fixed-point
+	   precision:
+
+		   volume=volume=6dB:precision=fixed
+
+       o   Fade volume after time 10 with an annihilation period of 5 seconds:
+
+		   volume='if(lt(t,10),1,max(1-(t-10)/5,0))':eval=frame
+
+   volumedetect
+       Detect the volume of the input video.
+
+       The filter has no parameters. It supports only 16-bit signed integer
+       samples, so the input will be converted when needed. Statistics about
+       the volume will be printed in the log when the input stream end is
+       reached.
+
+       In particular it will show the mean volume (root mean square), maximum
+       volume (on a per-sample basis), and the beginning of a histogram of the
+       registered volume values (from the maximum value to a cumulated 1/1000
+       of the samples).
+
+       All volumes are in decibels relative to the maximum PCM value.
+
+       Examples
+
+       Here is an excerpt of the output:
+
+	       [Parsed_volumedetect_0  0xa23120] mean_volume: -27 dB
+	       [Parsed_volumedetect_0  0xa23120] max_volume: -4 dB
+	       [Parsed_volumedetect_0  0xa23120] histogram_4db: 6
+	       [Parsed_volumedetect_0  0xa23120] histogram_5db: 62
+	       [Parsed_volumedetect_0  0xa23120] histogram_6db: 286
+	       [Parsed_volumedetect_0  0xa23120] histogram_7db: 1042
+	       [Parsed_volumedetect_0  0xa23120] histogram_8db: 2551
+	       [Parsed_volumedetect_0  0xa23120] histogram_9db: 4609
+	       [Parsed_volumedetect_0  0xa23120] histogram_10db: 8409
+
+       It means that:
+
+       o   The mean square energy is approximately -27 dB, or 10^-2.7.
+
+       o   The largest sample is at -4 dB, or more precisely between -4 dB and
+	   -5 dB.
+
+       o   There are 6 samples at -4 dB, 62 at -5 dB, 286 at -6 dB, etc.
+
+       In other words, raising the volume by +4 dB does not cause any
+       clipping, raising it by +5 dB causes clipping for 6 samples, etc.
+
+AUDIO SOURCES
+       Below is a description of the currently available audio sources.
+
+   abuffer
+       Buffer audio frames, and make them available to the filter chain.
+
+       This source is mainly intended for a programmatic use, in particular
+       through the interface defined in libavfilter/buffersrc.h.
+
+       It accepts the following parameters:
+
+       time_base
+	   The timebase which will be used for timestamps of submitted frames.
+	   It must be either a floating-point number or in
+	   numerator/denominator form.
+
+       sample_rate
+	   The sample rate of the incoming audio buffers.
+
+       sample_fmt
+	   The sample format of the incoming audio buffers.  Either a sample
+	   format name or its corresponding integer representation from the
+	   enum AVSampleFormat in libavutil/samplefmt.h
+
+       channel_layout
+	   The channel layout of the incoming audio buffers.  Either a channel
+	   layout name from channel_layout_map in libavutil/channel_layout.c
+	   or its corresponding integer representation from the AV_CH_LAYOUT_*
+	   macros in libavutil/channel_layout.h
+
+       channels
+	   The number of channels of the incoming audio buffers.  If both
+	   channels and channel_layout are specified, then they must be
+	   consistent.
+
+       Examples
+
+	       abuffer=sample_rate=44100:sample_fmt=s16p:channel_layout=stereo
+
+       will instruct the source to accept planar 16bit signed stereo at
+       44100Hz.  Since the sample format with name "s16p" corresponds to the
+       number 6 and the "stereo" channel layout corresponds to the value 0x3,
+       this is equivalent to:
+
+	       abuffer=sample_rate=44100:sample_fmt=6:channel_layout=0x3
+
+   aevalsrc
+       Generate an audio signal specified by an expression.
+
+       This source accepts in input one or more expressions (one for each
+       channel), which are evaluated and used to generate a corresponding
+       audio signal.
+
+       This source accepts the following options:
+
+       exprs
+	   Set the '|'-separated expressions list for each separate channel.
+	   In case the channel_layout option is not specified, the selected
+	   channel layout depends on the number of provided expressions.
+	   Otherwise the last specified expression is applied to the remaining
+	   output channels.
+
+       channel_layout, c
+	   Set the channel layout. The number of channels in the specified
+	   layout must be equal to the number of specified expressions.
+
+       duration, d
+	   Set the minimum duration of the sourced audio. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  Note that the resulting duration may be greater than the
+	   specified duration, as the generated audio is always cut at the end
+	   of a complete frame.
+
+	   If not specified, or the expressed duration is negative, the audio
+	   is supposed to be generated forever.
+
+       nb_samples, n
+	   Set the number of samples per channel per each output frame,
+	   default to 1024.
+
+       sample_rate, s
+	   Specify the sample rate, default to 44100.
+
+       Each expression in exprs can contain the following constants:
+
+       n   number of the evaluated sample, starting from 0
+
+       t   time of the evaluated sample expressed in seconds, starting from 0
+
+       s   sample rate
+
+       Examples
+
+       o   Generate silence:
+
+		   aevalsrc=0
+
+       o   Generate a sin signal with frequency of 440 Hz, set sample rate to
+	   8000 Hz:
+
+		   aevalsrc="sin(440*2*PI*t):s=8000"
+
+       o   Generate a two channels signal, specify the channel layout (Front
+	   Center + Back Center) explicitly:
+
+		   aevalsrc="sin(420*2*PI*t)|cos(430*2*PI*t):c=FC|BC"
+
+       o   Generate white noise:
+
+		   aevalsrc="-2+random(0)"
+
+       o   Generate an amplitude modulated signal:
+
+		   aevalsrc="sin(10*2*PI*t)*sin(880*2*PI*t)"
+
+       o   Generate 2.5 Hz binaural beats on a 360 Hz carrier:
+
+		   aevalsrc="0.1*sin(2*PI*(360-2.5/2)*t) | 0.1*sin(2*PI*(360+2.5/2)*t)"
+
+   afdelaysrc
+       Generate a fractional delay FIR coefficients.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       delay, d
+	   Set the fractional delay. Default is 0.
+
+       sample_rate, r
+	   Set the sample rate, default is 44100.
+
+       nb_samples, n
+	   Set the number of samples per each frame. Default is 1024.
+
+       taps, t
+	   Set the number of filter coefficients in output audio stream.
+	   Default value is 0.
+
+       channel_layout, c
+	   Specifies the channel layout, and can be a string representing a
+	   channel layout.  The default value of channel_layout is "stereo".
+
+   afireqsrc
+       Generate a FIR equalizer coefficients.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       preset, p
+	   Set equalizer preset.  Default preset is "flat".
+
+	   Available presets are:
+
+	   custom
+	   flat
+	   acoustic
+	   bass
+	   beats
+	   classic
+	   clear
+	   deep bass
+	   dubstep
+	   electronic
+	   hard-style
+	   hip-hop
+	   jazz
+	   metal
+	   movie
+	   pop
+	   r&b
+	   rock
+	   vocal booster
+       gains, g
+	   Set custom gains for each band. Only used if the preset option is
+	   set to "custom".  Gains are separated by white spaces and each gain
+	   is set in dBFS.  Default is "0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0".
+
+       bands, b
+	   Set the custom bands from where custon equalizer gains are set.
+	   This must be in strictly increasing order. Only used if the preset
+	   option is set to "custom".  Bands are separated by white spaces and
+	   each band represent frequency in Hz.  Default is "25 40 63 100 160
+	   250 400 630 1000 1600 2500 4000 6300 10000 16000 24000".
+
+       taps, t
+	   Set number of filter coefficients in output audio stream.  Default
+	   value is 4096.
+
+       sample_rate, r
+	   Set sample rate of output audio stream, default is 44100.
+
+       nb_samples, n
+	   Set number of samples per each frame in output audio stream.
+	   Default is 1024.
+
+       interp, i
+	   Set interpolation method for FIR equalizer coefficients. Can be
+	   "linear" or "cubic".
+
+       phase, h
+	   Set phase type of FIR filter. Can be "linear" or "min": minimum-
+	   phase.  Default is minimum-phase filter.
+
+   afirsrc
+       Generate a FIR coefficients using frequency sampling method.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       taps, t
+	   Set number of filter coefficients in output audio stream.  Default
+	   value is 1025.
+
+       frequency, f
+	   Set frequency points from where magnitude and phase are set.  This
+	   must be in non decreasing order, and first element must be 0, while
+	   last element must be 1. Elements are separated by white spaces.
+
+       magnitude, m
+	   Set magnitude value for every frequency point set by frequency.
+	   Number of values must be same as number of frequency points.
+	   Values are separated by white spaces.
+
+       phase, p
+	   Set phase value for every frequency point set by frequency.	Number
+	   of values must be same as number of frequency points.  Values are
+	   separated by white spaces.
+
+       sample_rate, r
+	   Set sample rate, default is 44100.
+
+       nb_samples, n
+	   Set number of samples per each frame. Default is 1024.
+
+       win_func, w
+	   Set window function. Default is blackman.
+
+   anullsrc
+       The null audio source, return unprocessed audio frames. It is mainly
+       useful as a template and to be employed in analysis / debugging tools,
+       or as the source for filters which ignore the input data (for example
+       the sox synth filter).
+
+       This source accepts the following options:
+
+       channel_layout, cl
+	   Specifies the channel layout, and can be either an integer or a
+	   string representing a channel layout. The default value of
+	   channel_layout is "stereo".
+
+	   Check the channel_layout_map definition in
+	   libavutil/channel_layout.c for the mapping between strings and
+	   channel layout values.
+
+       sample_rate, r
+	   Specifies the sample rate, and defaults to 44100.
+
+       nb_samples, n
+	   Set the number of samples per requested frames.
+
+       duration, d
+	   Set the duration of the sourced audio. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the audio
+	   is supposed to be generated forever.
+
+       Examples
+
+       o   Set the sample rate to 48000 Hz and the channel layout to
+	   AV_CH_LAYOUT_MONO.
+
+		   anullsrc=r=48000:cl=4
+
+       o   Do the same operation with a more obvious syntax:
+
+		   anullsrc=r=48000:cl=mono
+
+       All the parameters need to be explicitly defined.
+
+   flite
+       Synthesize a voice utterance using the libflite library.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libflite".
+
+       Note that versions of the flite library prior to 2.0 are not thread-
+       safe.
+
+       The filter accepts the following options:
+
+       list_voices
+	   If set to 1, list the names of the available voices and exit
+	   immediately. Default value is 0.
+
+       nb_samples, n
+	   Set the maximum number of samples per frame. Default value is 512.
+
+       textfile
+	   Set the filename containing the text to speak.
+
+       text
+	   Set the text to speak.
+
+       voice, v
+	   Set the voice to use for the speech synthesis. Default value is
+	   "kal". See also the list_voices option.
+
+       Examples
+
+       o   Read from file speech.txt, and synthesize the text using the
+	   standard flite voice:
+
+		   flite=textfile=speech.txt
+
+       o   Read the specified text selecting the "slt" voice:
+
+		   flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
+
+       o   Input text to ffmpeg:
+
+		   ffmpeg -f lavfi -i flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
+
+       o   Make ffplay speak the specified text, using "flite" and the "lavfi"
+	   device:
+
+		   ffplay -f lavfi flite=text='No more be grieved for which that thou hast done.'
+
+       For more information about libflite, check:
+       <http://www.festvox.org/flite/>
+
+   anoisesrc
+       Generate a noise audio signal.
+
+       The filter accepts the following options:
+
+       sample_rate, r
+	   Specify the sample rate. Default value is 48000 Hz.
+
+       amplitude, a
+	   Specify the amplitude (0.0 - 1.0) of the generated audio stream.
+	   Default value is 1.0.
+
+       duration, d
+	   Specify the duration of the generated audio stream. Not specifying
+	   this option results in noise with an infinite length.
+
+       color, colour, c
+	   Specify the color of noise. Available noise colors are white, pink,
+	   brown, blue, violet and velvet. Default color is white.
+
+       seed, s
+	   Specify a value used to seed the PRNG.
+
+       nb_samples, n
+	   Set the number of samples per each output frame, default is 1024.
+
+       density
+	   Set the density (0.0 - 1.0) for the velvet noise generator, default
+	   is 0.05.
+
+       Examples
+
+       o   Generate 60 seconds of pink noise, with a 44.1 kHz sampling rate
+	   and an amplitude of 0.5:
+
+		   anoisesrc=d=60:c=pink:r=44100:a=0.5
+
+   hilbert
+       Generate odd-tap Hilbert transform FIR coefficients.
+
+       The resulting stream can be used with afir filter for phase-shifting
+       the signal by 90 degrees.
+
+       This is used in many matrix coding schemes and for analytic signal
+       generation.  The process is often written as a multiplication by i (or
+       j), the imaginary unit.
+
+       The filter accepts the following options:
+
+       sample_rate, s
+	   Set sample rate, default is 44100.
+
+       taps, t
+	   Set length of FIR filter, default is 22051.
+
+       nb_samples, n
+	   Set number of samples per each frame.
+
+       win_func, w
+	   Set window function to be used when generating FIR coefficients.
+
+   sinc
+       Generate a sinc kaiser-windowed low-pass, high-pass, band-pass, or
+       band-reject FIR coefficients.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       sample_rate, r
+	   Set sample rate, default is 44100.
+
+       nb_samples, n
+	   Set number of samples per each frame. Default is 1024.
+
+       hp  Set high-pass frequency. Default is 0.
+
+       lp  Set low-pass frequency. Default is 0.  If high-pass frequency is
+	   lower than low-pass frequency and low-pass frequency is higher than
+	   0 then filter will create band-pass filter coefficients, otherwise
+	   band-reject filter coefficients.
+
+       phase
+	   Set filter phase response. Default is 50. Allowed range is from 0
+	   to 100.
+
+       beta
+	   Set Kaiser window beta.
+
+       att Set stop-band attenuation. Default is 120dB, allowed range is from
+	   40 to 180 dB.
+
+       round
+	   Enable rounding, by default is disabled.
+
+       hptaps
+	   Set number of taps for high-pass filter.
+
+       lptaps
+	   Set number of taps for low-pass filter.
+
+   sine
+       Generate an audio signal made of a sine wave with amplitude 1/8.
+
+       The audio signal is bit-exact.
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the carrier frequency. Default is 440 Hz.
+
+       beep_factor, b
+	   Enable a periodic beep every second with frequency beep_factor
+	   times the carrier frequency. Default is 0, meaning the beep is
+	   disabled.
+
+       sample_rate, r
+	   Specify the sample rate, default is 44100.
+
+       duration, d
+	   Specify the duration of the generated audio stream.
+
+       samples_per_frame
+	   Set the number of samples per output frame.
+
+	   The expression can contain the following constants:
+
+	   n   The (sequential) number of the output audio frame, starting
+	       from 0.
+
+	   pts The PTS (Presentation TimeStamp) of the output audio frame,
+	       expressed in TB units.
+
+	   t   The PTS of the output audio frame, expressed in seconds.
+
+	   TB  The timebase of the output audio frames.
+
+	   Default is 1024.
+
+       Examples
+
+       o   Generate a simple 440 Hz sine wave:
+
+		   sine
+
+       o   Generate a 220 Hz sine wave with a 880 Hz beep each second, for 5
+	   seconds:
+
+		   sine=220:4:d=5
+		   sine=f=220:b=4:d=5
+		   sine=frequency=220:beep_factor=4:duration=5
+
+       o   Generate a 1 kHz sine wave following "1602,1601,1602,1601,1602"
+	   NTSC pattern:
+
+		   sine=1000:samples_per_frame='st(0,mod(n,5)); 1602-not(not(eq(ld(0),1)+eq(ld(0),3)))'
+
+AUDIO SINKS
+       Below is a description of the currently available audio sinks.
+
+   abuffersink
+       Buffer audio frames, and make them available to the end of filter
+       chain.
+
+       This sink is mainly intended for programmatic use, in particular
+       through the interface defined in libavfilter/buffersink.h or the
+       options system.
+
+       It accepts a pointer to an AVABufferSinkContext structure, which
+       defines the incoming buffers' formats, to be passed as the opaque
+       parameter to "avfilter_init_filter" for initialization.
+
+   anullsink
+       Null audio sink; do absolutely nothing with the input audio. It is
+       mainly useful as a template and for use in analysis / debugging tools.
+
+VIDEO FILTERS
+       When you configure your FFmpeg build, you can disable any of the
+       existing filters using "--disable-filters".  The configure output will
+       show the video filters included in your build.
+
+       Below is a description of the currently available video filters.
+
+   addroi
+       Mark a region of interest in a video frame.
+
+       The frame data is passed through unchanged, but metadata is attached to
+       the frame indicating regions of interest which can affect the behaviour
+       of later encoding.  Multiple regions can be marked by applying the
+       filter multiple times.
+
+       x   Region distance in pixels from the left edge of the frame.
+
+       y   Region distance in pixels from the top edge of the frame.
+
+       w   Region width in pixels.
+
+       h   Region height in pixels.
+
+	   The parameters x, y, w and h are expressions, and may contain the
+	   following variables:
+
+	   iw  Width of the input frame.
+
+	   ih  Height of the input frame.
+
+       qoffset
+	   Quantisation offset to apply within the region.
+
+	   This must be a real value in the range -1 to +1.  A value of zero
+	   indicates no quality change.  A negative value asks for better
+	   quality (less quantisation), while a positive value asks for worse
+	   quality (greater quantisation).
+
+	   The range is calibrated so that the extreme values indicate the
+	   largest possible offset - if the rest of the frame is encoded with
+	   the worst possible quality, an offset of -1 indicates that this
+	   region should be encoded with the best possible quality anyway.
+	   Intermediate values are then interpolated in some codec-dependent
+	   way.
+
+	   For example, in 10-bit H.264 the quantisation parameter varies
+	   between -12 and 51.	A typical qoffset value of -1/10 therefore
+	   indicates that this region should be encoded with a QP around one-
+	   tenth of the full range better than the rest of the frame.  So, if
+	   most of the frame were to be encoded with a QP of around 30, this
+	   region would get a QP of around 24 (an offset of approximately
+	   -1/10 * (51 - -12) = -6.3).	An extreme value of -1 would indicate
+	   that this region should be encoded with the best possible quality
+	   regardless of the treatment of the rest of the frame - that is,
+	   should be encoded at a QP of -12.
+
+       clear
+	   If set to true, remove any existing regions of interest marked on
+	   the frame before adding the new one.
+
+       Examples
+
+       o   Mark the centre quarter of the frame as interesting.
+
+		   addroi=iw/4:ih/4:iw/2:ih/2:-1/10
+
+       o   Mark the 100-pixel-wide region on the left edge of the frame as
+	   very uninteresting (to be encoded at much lower quality than the
+	   rest of the frame).
+
+		   addroi=0:0:100:ih:+1/5
+
+   alphaextract
+       Extract the alpha component from the input as a grayscale video. This
+       is especially useful with the alphamerge filter.
+
+   alphamerge
+       Add or replace the alpha component of the primary input with the
+       grayscale value of a second input. This is intended for use with
+       alphaextract to allow the transmission or storage of frame sequences
+       that have alpha in a format that doesn't support an alpha channel.
+
+       For example, to reconstruct full frames from a normal YUV-encoded video
+       and a separate video created with alphaextract, you might use:
+
+	       movie=in_alpha.mkv [alpha]; [in][alpha] alphamerge [out]
+
+   amplify
+       Amplify differences between current pixel and pixels of adjacent frames
+       in same pixel location.
+
+       This filter accepts the following options:
+
+       radius
+	   Set frame radius. Default is 2. Allowed range is from 1 to 63.  For
+	   example radius of 3 will instruct filter to calculate average of 7
+	   frames.
+
+       factor
+	   Set factor to amplify difference. Default is 2. Allowed range is
+	   from 0 to 65535.
+
+       threshold
+	   Set threshold for difference amplification. Any difference greater
+	   or equal to this value will not alter source pixel. Default is 10.
+	   Allowed range is from 0 to 65535.
+
+       tolerance
+	   Set tolerance for difference amplification. Any difference lower to
+	   this value will not alter source pixel. Default is 0.  Allowed
+	   range is from 0 to 65535.
+
+       low Set lower limit for changing source pixel. Default is 65535.
+	   Allowed range is from 0 to 65535.  This option controls maximum
+	   possible value that will decrease source pixel value.
+
+       high
+	   Set high limit for changing source pixel. Default is 65535. Allowed
+	   range is from 0 to 65535.  This option controls maximum possible
+	   value that will increase source pixel value.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       Commands
+
+       This filter supports the following commands that corresponds to option
+       of same name:
+
+       factor
+       threshold
+       tolerance
+       low
+       high
+       planes
+
+   ass
+       Same as the subtitles filter, except that it doesn't require libavcodec
+       and libavformat to work. On the other hand, it is limited to ASS
+       (Advanced Substation Alpha) subtitles files.
+
+       This filter accepts the following option in addition to the common
+       options from the subtitles filter:
+
+       shaping
+	   Set the shaping engine
+
+	   Available values are:
+
+	   auto
+	       The default libass shaping engine, which is the best available.
+
+	   simple
+	       Fast, font-agnostic shaper that can do only substitutions
+
+	   complex
+	       Slower shaper using OpenType for substitutions and positioning
+
+	   The default is "auto".
+
+   atadenoise
+       Apply an Adaptive Temporal Averaging Denoiser to the video input.
+
+       The filter accepts the following options:
+
+       0a  Set threshold A for 1st plane. Default is 0.02.  Valid range is 0
+	   to 0.3.
+
+       0b  Set threshold B for 1st plane. Default is 0.04.  Valid range is 0
+	   to 5.
+
+       1a  Set threshold A for 2nd plane. Default is 0.02.  Valid range is 0
+	   to 0.3.
+
+       1b  Set threshold B for 2nd plane. Default is 0.04.  Valid range is 0
+	   to 5.
+
+       2a  Set threshold A for 3rd plane. Default is 0.02.  Valid range is 0
+	   to 0.3.
+
+       2b  Set threshold B for 3rd plane. Default is 0.04.  Valid range is 0
+	   to 5.
+
+	   Threshold A is designed to react on abrupt changes in the input
+	   signal and threshold B is designed to react on continuous changes
+	   in the input signal.
+
+       s   Set number of frames filter will use for averaging. Default is 9.
+	   Must be odd number in range [5, 129].
+
+       p   Set what planes of frame filter will use for averaging. Default is
+	   all.
+
+       a   Set what variant of algorithm filter will use for averaging.
+	   Default is "p" parallel.  Alternatively can be set to "s" serial.
+
+	   Parallel can be faster then serial, while other way around is never
+	   true.  Parallel will abort early on first change being greater then
+	   thresholds, while serial will continue processing other side of
+	   frames if they are equal or below thresholds.
+
+       0s
+       1s
+       2s  Set sigma for 1st plane, 2nd plane or 3rd plane. Default is 32767.
+	   Valid range is from 0 to 32767.  This options controls weight for
+	   each pixel in radius defined by size.  Default value means every
+	   pixel have same weight.  Setting this option to 0 effectively
+	   disables filtering.
+
+       Commands
+
+       This filter supports same commands as options except option "s".  The
+       command accepts the same syntax of the corresponding option.
+
+   avgblur
+       Apply average blur filter.
+
+       The filter accepts the following options:
+
+       sizeX
+	   Set horizontal radius size.
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       sizeY
+	   Set vertical radius size, if zero it will be same as "sizeX".
+	   Default is 0.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   backgroundkey
+       Turns a static background into transparency.
+
+       The filter accepts the following option:
+
+       threshold
+	   Threshold for scene change detection.
+
+       similarity
+	   Similarity percentage with the background.
+
+       blend
+	   Set the blend amount for pixels that are not similar.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   bbox
+       Compute the bounding box for the non-black pixels in the input frame
+       luma plane.
+
+       This filter computes the bounding box containing all the pixels with a
+       luma value greater than the minimum allowed value.  The parameters
+       describing the bounding box are printed on the filter log.
+
+       The filter accepts the following option:
+
+       min_val
+	   Set the minimal luma value. Default is 16.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   bilateral
+       Apply bilateral filter, spatial smoothing while preserving edges.
+
+       The filter accepts the following options:
+
+       sigmaS
+	   Set sigma of gaussian function to calculate spatial weight.
+	   Allowed range is 0 to 512. Default is 0.1.
+
+       sigmaR
+	   Set sigma of gaussian function to calculate range weight.  Allowed
+	   range is 0 to 1. Default is 0.1.
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   bilateral_cuda
+       CUDA accelerated bilateral filter, an edge preserving filter.  This
+       filter is mathematically accurate thanks to the use of GPU
+       acceleration.  For best output quality, use one to one chroma
+       subsampling, i.e. yuv444p format.
+
+       The filter accepts the following options:
+
+       sigmaS
+	   Set sigma of gaussian function to calculate spatial weight, also
+	   called sigma space.	Allowed range is 0.1 to 512. Default is 0.1.
+
+       sigmaR
+	   Set sigma of gaussian function to calculate color range weight,
+	   also called sigma color.  Allowed range is 0.1 to 512. Default is
+	   0.1.
+
+       window_size
+	   Set window size of the bilateral function to determine the number
+	   of neighbours to loop on.  If the number entered is even, one will
+	   be added automatically.  Allowed range is 1 to 255. Default is 1.
+
+       Examples
+
+       o   Apply the bilateral filter on a video.
+
+		   ./ffmpeg -v verbose \
+		   -hwaccel cuda -hwaccel_output_format cuda -i input.mp4  \
+		   -init_hw_device cuda \
+		   -filter_complex \
+		   " \
+		   [0:v]scale_cuda=format=yuv444p[scaled_video];
+		   [scaled_video]bilateral_cuda=window_size=9:sigmaS=3.0:sigmaR=50.0" \
+		   -an -sn -c:v h264_nvenc -cq 20 out.mp4
+
+   bitplanenoise
+       Show and measure bit plane noise.
+
+       The filter accepts the following options:
+
+       bitplane
+	   Set which plane to analyze. Default is 1.
+
+       filter
+	   Filter out noisy pixels from "bitplane" set above.  Default is
+	   disabled.
+
+   blackdetect
+       Detect video intervals that are (almost) completely black. Can be
+       useful to detect chapter transitions, commercials, or invalid
+       recordings.
+
+       The filter outputs its detection analysis to both the log as well as
+       frame metadata. If a black segment of at least the specified minimum
+       duration is found, a line with the start and end timestamps as well as
+       duration is printed to the log with level "info". In addition, a log
+       line with level "debug" is printed per frame showing the black amount
+       detected for that frame.
+
+       The filter also attaches metadata to the first frame of a black segment
+       with key "lavfi.black_start" and to the first frame after the black
+       segment ends with key "lavfi.black_end". The value is the frame's
+       timestamp. This metadata is added regardless of the minimum duration
+       specified.
+
+       The filter accepts the following options:
+
+       black_min_duration, d
+	   Set the minimum detected black duration expressed in seconds. It
+	   must be a non-negative floating point number.
+
+	   Default value is 2.0.
+
+       picture_black_ratio_th, pic_th
+	   Set the threshold for considering a picture "black".  Express the
+	   minimum value for the ratio:
+
+		   <nb_black_pixels> / <nb_pixels>
+
+	   for which a picture is considered black.  Default value is 0.98.
+
+       pixel_black_th, pix_th
+	   Set the threshold for considering a pixel "black".
+
+	   The threshold expresses the maximum pixel luma value for which a
+	   pixel is considered "black". The provided value is scaled according
+	   to the following equation:
+
+		   <absolute_threshold> = <luma_minimum_value> + <pixel_black_th> * <luma_range_size>
+
+	   luma_range_size and luma_minimum_value depend on the input video
+	   format, the range is [0-255] for YUV full-range formats and
+	   [16-235] for YUV non full-range formats.
+
+	   Default value is 0.10.
+
+       The following example sets the maximum pixel threshold to the minimum
+       value, and detects only black intervals of 2 or more seconds:
+
+	       blackdetect=d=2:pix_th=0.00
+
+   blackframe
+       Detect frames that are (almost) completely black. Can be useful to
+       detect chapter transitions or commercials. Output lines consist of the
+       frame number of the detected frame, the percentage of blackness, the
+       position in the file if known or -1 and the timestamp in seconds.
+
+       In order to display the output lines, you need to set the loglevel at
+       least to the AV_LOG_INFO value.
+
+       This filter exports frame metadata "lavfi.blackframe.pblack".  The
+       value represents the percentage of pixels in the picture that are below
+       the threshold value.
+
+       It accepts the following parameters:
+
+       amount
+	   The percentage of the pixels that have to be below the threshold;
+	   it defaults to 98.
+
+       threshold, thresh
+	   The threshold below which a pixel value is considered black; it
+	   defaults to 32.
+
+   blend
+       Blend two video frames into each other.
+
+       The "blend" filter takes two input streams and outputs one stream, the
+       first input is the "top" layer and second input is "bottom" layer.  By
+       default, the output terminates when the longest input terminates.
+
+       The "tblend" (time blend) filter takes two consecutive frames from one
+       single stream, and outputs the result obtained by blending the new
+       frame on top of the old frame.
+
+       A description of the accepted options follows.
+
+       c0_mode
+       c1_mode
+       c2_mode
+       c3_mode
+       all_mode
+	   Set blend mode for specific pixel component or all pixel components
+	   in case of all_mode. Default value is "normal".
+
+	   Available values for component modes are:
+
+	   addition
+	   and
+	   average
+	   bleach
+	   burn
+	   darken
+	   difference
+	   divide
+	   dodge
+	   exclusion
+	   extremity
+	   freeze
+	   geometric
+	   glow
+	   grainextract
+	   grainmerge
+	   hardlight
+	   hardmix
+	   hardoverlay
+	   harmonic
+	   heat
+	   interpolate
+	   lighten
+	   linearlight
+	   multiply
+	   multiply128
+	   negation
+	   normal
+	   or
+	   overlay
+	   phoenix
+	   pinlight
+	   reflect
+	   screen
+	   softdifference
+	   softlight
+	   stain
+	   subtract
+	   vividlight
+	   xor
+       c0_opacity
+       c1_opacity
+       c2_opacity
+       c3_opacity
+       all_opacity
+	   Set blend opacity for specific pixel component or all pixel
+	   components in case of all_opacity. Only used in combination with
+	   pixel component blend modes.
+
+       c0_expr
+       c1_expr
+       c2_expr
+       c3_expr
+       all_expr
+	   Set blend expression for specific pixel component or all pixel
+	   components in case of all_expr. Note that related mode options will
+	   be ignored if those are set.
+
+	   The expressions can use the following variables:
+
+	   N   The sequential number of the filtered frame, starting from 0.
+
+	   X
+	   Y   the coordinates of the current sample
+
+	   W
+	   H   the width and height of currently filtered plane
+
+	   SW
+	   SH  Width and height scale for the plane being filtered. It is the
+	       ratio between the dimensions of the current plane to the luma
+	       plane, e.g. for a "yuv420p" frame, the values are "1,1" for the
+	       luma plane and "0.5,0.5" for the chroma planes.
+
+	   T   Time of the current frame, expressed in seconds.
+
+	   TOP, A
+	       Value of pixel component at current location for first video
+	       frame (top layer).
+
+	   BOTTOM, B
+	       Value of pixel component at current location for second video
+	       frame (bottom layer).
+
+       The "blend" filter also supports the framesync options.
+
+       Examples
+
+       o   Apply transition from bottom layer to top layer in first 10
+	   seconds:
+
+		   blend=all_expr='A*(if(gte(T,10),1,T/10))+B*(1-(if(gte(T,10),1,T/10)))'
+
+       o   Apply linear horizontal transition from top layer to bottom layer:
+
+		   blend=all_expr='A*(X/W)+B*(1-X/W)'
+
+       o   Apply 1x1 checkerboard effect:
+
+		   blend=all_expr='if(eq(mod(X,2),mod(Y,2)),A,B)'
+
+       o   Apply uncover left effect:
+
+		   blend=all_expr='if(gte(N*SW+X,W),A,B)'
+
+       o   Apply uncover down effect:
+
+		   blend=all_expr='if(gte(Y-N*SH,0),A,B)'
+
+       o   Apply uncover up-left effect:
+
+		   blend=all_expr='if(gte(T*SH*40+Y,H)*gte((T*40*SW+X)*W/H,W),A,B)'
+
+       o   Split diagonally video and shows top and bottom layer on each side:
+
+		   blend=all_expr='if(gt(X,Y*(W/H)),A,B)'
+
+       o   Display differences between the current and the previous frame:
+
+		   tblend=all_mode=grainextract
+
+       Commands
+
+       This filter supports same commands as options.
+
+   blockdetect
+       Determines blockiness of frames without altering the input frames.
+
+       Based on Remco Muijs and Ihor Kirenko: "A no-reference blocking
+       artifact measure for adaptive video processing." 2005 13th European
+       signal processing conference.
+
+       The filter accepts the following options:
+
+       period_min
+       period_max
+	   Set minimum and maximum values for determining pixel grids
+	   (periods).  Default values are [3,24].
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Examples
+
+       o   Determine blockiness for the first plane and search for periods
+	   within [8,32]:
+
+		   blockdetect=period_min=8:period_max=32:planes=1
+
+   blurdetect
+       Determines blurriness of frames without altering the input frames.
+
+       Based on Marziliano, Pina, et al. "A no-reference perceptual blur
+       metric."  Allows for a block-based abbreviation.
+
+       The filter accepts the following options:
+
+       low
+       high
+	   Set low and high threshold values used by the Canny thresholding
+	   algorithm.
+
+	   The high threshold selects the "strong" edge pixels, which are then
+	   connected through 8-connectivity with the "weak" edge pixels
+	   selected by the low threshold.
+
+	   low and high threshold values must be chosen in the range [0,1],
+	   and low should be lesser or equal to high.
+
+	   Default value for low is "20/255", and default value for high is
+	   "50/255".
+
+       radius
+	   Define the radius to search around an edge pixel for local maxima.
+
+       block_pct
+	   Determine blurriness only for the most significant blocks, given in
+	   percentage.
+
+       block_width
+	   Determine blurriness for blocks of width block_width. If set to any
+	   value smaller 1, no blocks are used and the whole image is
+	   processed as one no matter of block_height.
+
+       block_height
+	   Determine blurriness for blocks of height block_height. If set to
+	   any value smaller 1, no blocks are used and the whole image is
+	   processed as one no matter of block_width.
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Examples
+
+       o   Determine blur for 80% of most significant 32x32 blocks:
+
+		   blurdetect=block_width=32:block_height=32:block_pct=80
+
+   bm3d
+       Denoise frames using Block-Matching 3D algorithm.
+
+       The filter accepts the following options.
+
+       sigma
+	   Set denoising strength. Default value is 1.	Allowed range is from
+	   0 to 999.9.	The denoising algorithm is very sensitive to sigma, so
+	   adjust it according to the source.
+
+       block
+	   Set local patch size. This sets dimensions in 2D.
+
+       bstep
+	   Set sliding step for processing blocks. Default value is 4.
+	   Allowed range is from 1 to 64.  Smaller values allows processing
+	   more reference blocks and is slower.
+
+       group
+	   Set maximal number of similar blocks for 3rd dimension. Default
+	   value is 1.	When set to 1, no block matching is done. Larger
+	   values allows more blocks in single group.  Allowed range is from 1
+	   to 256.
+
+       range
+	   Set radius for search block matching. Default is 9.	Allowed range
+	   is from 1 to INT32_MAX.
+
+       mstep
+	   Set step between two search locations for block matching. Default
+	   is 1.  Allowed range is from 1 to 64. Smaller is slower.
+
+       thmse
+	   Set threshold of mean square error for block matching. Valid range
+	   is 0 to INT32_MAX.
+
+       hdthr
+	   Set thresholding parameter for hard thresholding in 3D transformed
+	   domain.  Larger values results in stronger hard-thresholding
+	   filtering in frequency domain.
+
+       estim
+	   Set filtering estimation mode. Can be "basic" or "final".  Default
+	   is "basic".
+
+       ref If enabled, filter will use 2nd stream for block matching.  Default
+	   is disabled for "basic" value of estim option, and always enabled
+	   if value of estim is "final".
+
+       planes
+	   Set planes to filter. Default is all available except alpha.
+
+       Examples
+
+       o   Basic filtering with bm3d:
+
+		   bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic
+
+       o   Same as above, but filtering only luma:
+
+		   bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic:planes=1
+
+       o   Same as above, but with both estimation modes:
+
+		   split[a][b],[a]bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic[a],[b][a]bm3d=sigma=3:block=4:bstep=2:group=16:estim=final:ref=1
+
+       o   Same as above, but prefilter with nlmeans filter instead:
+
+		   split[a][b],[a]nlmeans=s=3:r=7:p=3[a],[b][a]bm3d=sigma=3:block=4:bstep=2:group=16:estim=final:ref=1
+
+   boxblur
+       Apply a boxblur algorithm to the input video.
+
+       It accepts the following parameters:
+
+       luma_radius, lr
+       luma_power, lp
+       chroma_radius, cr
+       chroma_power, cp
+       alpha_radius, ar
+       alpha_power, ap
+
+       A description of the accepted options follows.
+
+       luma_radius, lr
+       chroma_radius, cr
+       alpha_radius, ar
+	   Set an expression for the box radius in pixels used for blurring
+	   the corresponding input plane.
+
+	   The radius value must be a non-negative number, and must not be
+	   greater than the value of the expression "min(w,h)/2" for the luma
+	   and alpha planes, and of "min(cw,ch)/2" for the chroma planes.
+
+	   Default value for luma_radius is "2". If not specified,
+	   chroma_radius and alpha_radius default to the corresponding value
+	   set for luma_radius.
+
+	   The expressions can contain the following constants:
+
+	   w
+	   h   The input width and height in pixels.
+
+	   cw
+	   ch  The input chroma image width and height in pixels.
+
+	   hsub
+	   vsub
+	       The horizontal and vertical chroma subsample values. For
+	       example, for the pixel format "yuv422p", hsub is 2 and vsub is
+	       1.
+
+       luma_power, lp
+       chroma_power, cp
+       alpha_power, ap
+	   Specify how many times the boxblur filter is applied to the
+	   corresponding plane.
+
+	   Default value for luma_power is 2. If not specified, chroma_power
+	   and alpha_power default to the corresponding value set for
+	   luma_power.
+
+	   A value of 0 will disable the effect.
+
+       Examples
+
+       o   Apply a boxblur filter with the luma, chroma, and alpha radii set
+	   to 2:
+
+		   boxblur=luma_radius=2:luma_power=1
+		   boxblur=2:1
+
+       o   Set the luma radius to 2, and alpha and chroma radius to 0:
+
+		   boxblur=2:1:cr=0:ar=0
+
+       o   Set the luma and chroma radii to a fraction of the video dimension:
+
+		   boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chroma_power=1
+
+   bwdif
+       Deinterlace the input video ("bwdif" stands for "Bob Weaver
+       Deinterlacing Filter").
+
+       Motion adaptive deinterlacing based on yadif with the use of w3fdif and
+       cubic interpolation algorithms.	It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   The default value is "send_field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   bwdif_cuda
+       Deinterlace the input video using the bwdif algorithm, but implemented
+       in CUDA so that it can work as part of a GPU accelerated pipeline with
+       nvdec and/or nvenc.
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   The default value is "send_field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   ccrepack
+       Repack CEA-708 closed captioning side data
+
+       This filter fixes various issues seen with commerical encoders related
+       to upstream malformed CEA-708 payloads, specifically incorrect number
+       of tuples (wrong cc_count for the target FPS), and incorrect ordering
+       of tuples (i.e. the CEA-608 tuples are not at the first entries in the
+       payload).
+
+   cas
+       Apply Contrast Adaptive Sharpen filter to video stream.
+
+       The filter accepts the following options:
+
+       strength
+	   Set the sharpening strength. Default value is 0.
+
+       planes
+	   Set planes to filter. Default value is to filter all planes except
+	   alpha plane.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   chromahold
+       Remove all color information for all colors except for certain one.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will not be replaced with neutral chroma.
+
+       similarity
+	   Similarity percentage with the above color.	0.01 matches only the
+	   exact key color, while 1.0 matches everything.
+
+       blend
+	   Blend percentage.  0.0 makes pixels either fully gray, or not gray
+	   at all.  Higher values result in more preserved color.
+
+       yuv Signals that the color passed is already in YUV instead of RGB.
+
+	   Literal colors like "green" or "red" don't make sense with this
+	   enabled anymore.  This can be used to pass exact YUV values as
+	   hexadecimal numbers.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   chromakey
+       YUV colorspace color/chroma keying.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will be replaced with transparency.
+
+       similarity
+	   Similarity percentage with the key color.
+
+	   0.01 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.
+
+	   0.0 makes pixels either fully transparent, or not transparent at
+	   all.
+
+	   Higher values result in semi-transparent pixels, with a higher
+	   transparency the more similar the pixels color is to the key color.
+
+       yuv Signals that the color passed is already in YUV instead of RGB.
+
+	   Literal colors like "green" or "red" don't make sense with this
+	   enabled anymore.  This can be used to pass exact YUV values as
+	   hexadecimal numbers.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+       Examples
+
+       o   Make every green pixel in the input image transparent:
+
+		   ffmpeg -i input.png -vf chromakey=green out.png
+
+       o   Overlay a greenscreen-video on top of a static black background.
+
+		   ffmpeg -f lavfi -i color=c=black:s=1280x720 -i video.mp4 -shortest -filter_complex "[1:v]chromakey=0x70de77:0.1:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.mkv
+
+   chromakey_cuda
+       CUDA accelerated YUV colorspace color/chroma keying.
+
+       This filter works like normal chromakey filter but operates on CUDA
+       frames.	for more details and parameters see chromakey.
+
+       Examples
+
+       o   Make all the green pixels in the input video transparent and use it
+	   as an overlay for another video:
+
+		   ./ffmpeg \
+		       -hwaccel cuda -hwaccel_output_format cuda -i input_green.mp4  \
+		       -hwaccel cuda -hwaccel_output_format cuda -i base_video.mp4 \
+		       -init_hw_device cuda \
+		       -filter_complex \
+		       " \
+			   [0:v]chromakey_cuda=0x25302D:0.1:0.12:1[overlay_video]; \
+			   [1:v]scale_cuda=format=yuv420p[base]; \
+			   [base][overlay_video]overlay_cuda" \
+		       -an -sn -c:v h264_nvenc -cq 20 output.mp4
+
+       o   Process two software sources, explicitly uploading the frames:
+
+		   ./ffmpeg -init_hw_device cuda=cuda -filter_hw_device cuda \
+		       -f lavfi -i color=size=800x600:color=white,format=yuv420p \
+		       -f lavfi -i yuvtestsrc=size=200x200,format=yuv420p \
+		       -filter_complex \
+		       " \
+			   [0]hwupload[under]; \
+			   [1]hwupload,chromakey_cuda=green:0.1:0.12[over]; \
+			   [under][over]overlay_cuda" \
+		       -c:v hevc_nvenc -cq 18 -preset slow output.mp4
+
+   chromanr
+       Reduce chrominance noise.
+
+       The filter accepts the following options:
+
+       thres
+	   Set threshold for averaging chrominance values.  Sum of absolute
+	   difference of Y, U and V pixel components of current pixel and
+	   neighbour pixels lower than this threshold will be used in
+	   averaging. Luma component is left unchanged and is copied to
+	   output.  Default value is 30. Allowed range is from 1 to 200.
+
+       sizew
+	   Set horizontal radius of rectangle used for averaging.  Allowed
+	   range is from 1 to 100. Default value is 5.
+
+       sizeh
+	   Set vertical radius of rectangle used for averaging.  Allowed range
+	   is from 1 to 100. Default value is 5.
+
+       stepw
+	   Set horizontal step when averaging. Default value is 1.  Allowed
+	   range is from 1 to 50.  Mostly useful to speed-up filtering.
+
+       steph
+	   Set vertical step when averaging. Default value is 1.  Allowed
+	   range is from 1 to 50.  Mostly useful to speed-up filtering.
+
+       threy
+	   Set Y threshold for averaging chrominance values.  Set finer
+	   control for max allowed difference between Y components of current
+	   pixel and neigbour pixels.  Default value is 200. Allowed range is
+	   from 1 to 200.
+
+       threu
+	   Set U threshold for averaging chrominance values.  Set finer
+	   control for max allowed difference between U components of current
+	   pixel and neigbour pixels.  Default value is 200. Allowed range is
+	   from 1 to 200.
+
+       threv
+	   Set V threshold for averaging chrominance values.  Set finer
+	   control for max allowed difference between V components of current
+	   pixel and neigbour pixels.  Default value is 200. Allowed range is
+	   from 1 to 200.
+
+       distance
+	   Set distance type used in calculations.
+
+	   manhattan
+	       Absolute difference.
+
+	   euclidean
+	       Difference squared.
+
+	   Default distance type is manhattan.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+   chromashift
+       Shift chroma pixels horizontally and/or vertically.
+
+       The filter accepts the following options:
+
+       cbh Set amount to shift chroma-blue horizontally.
+
+       cbv Set amount to shift chroma-blue vertically.
+
+       crh Set amount to shift chroma-red horizontally.
+
+       crv Set amount to shift chroma-red vertically.
+
+       edge
+	   Set edge mode, can be smear, default, or warp.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   ciescope
+       Display CIE color diagram with pixels overlaid onto it.
+
+       The filter accepts the following options:
+
+       system
+	   Set color system.
+
+	   ntsc, 470m
+	   ebu, 470bg
+	   smpte
+	   240m
+	   apple
+	   widergb
+	   cie1931
+	   rec709, hdtv
+	   uhdtv, rec2020
+	   dcip3
+       cie Set CIE system.
+
+	   xyy
+	   ucs
+	   luv
+       gamuts
+	   Set what gamuts to draw.
+
+	   See "system" option for available values.
+
+       size, s
+	   Set ciescope size, by default set to 512.
+
+       intensity, i
+	   Set intensity used to map input pixel values to CIE diagram.
+
+       contrast
+	   Set contrast used to draw tongue colors that are out of active
+	   color system gamut.
+
+       corrgamma
+	   Correct gamma displayed on scope, by default enabled.
+
+       showwhite
+	   Show white point on CIE diagram, by default disabled.
+
+       gamma
+	   Set input gamma. Used only with XYZ input color space.
+
+       fill
+	   Fill with CIE colors. By default is enabled.
+
+   codecview
+       Visualize information exported by some codecs.
+
+       Some codecs can export information through frames using side-data or
+       other means. For example, some MPEG based codecs export motion vectors
+       through the export_mvs flag in the codec flags2 option.
+
+       The filter accepts the following option:
+
+       block
+	   Display block partition structure using the luma plane.
+
+       mv  Set motion vectors to visualize.
+
+	   Available flags for mv are:
+
+	   pf  forward predicted MVs of P-frames
+
+	   bf  forward predicted MVs of B-frames
+
+	   bb  backward predicted MVs of B-frames
+
+       qp  Display quantization parameters using the chroma planes.
+
+       mv_type, mvt
+	   Set motion vectors type to visualize. Includes MVs from all frames
+	   unless specified by frame_type option.
+
+	   Available flags for mv_type are:
+
+	   fp  forward predicted MVs
+
+	   bp  backward predicted MVs
+
+       frame_type, ft
+	   Set frame type to visualize motion vectors of.
+
+	   Available flags for frame_type are:
+
+	   if  intra-coded frames (I-frames)
+
+	   pf  predicted frames (P-frames)
+
+	   bf  bi-directionally predicted frames (B-frames)
+
+       Examples
+
+       o   Visualize forward predicted MVs of all frames using ffplay:
+
+		   ffplay -flags2 +export_mvs input.mp4 -vf codecview=mv_type=fp
+
+       o   Visualize multi-directionals MVs of P and B-Frames using ffplay:
+
+		   ffplay -flags2 +export_mvs input.mp4 -vf codecview=mv=pf+bf+bb
+
+   colorbalance
+       Modify intensity of primary colors (red, green and blue) of input
+       frames.
+
+       The filter allows an input frame to be adjusted in the shadows,
+       midtones or highlights regions for the red-cyan, green-magenta or blue-
+       yellow balance.
+
+       A positive adjustment value shifts the balance towards the primary
+       color, a negative value towards the complementary color.
+
+       The filter accepts the following options:
+
+       rs
+       gs
+       bs  Adjust red, green and blue shadows (darkest pixels).
+
+       rm
+       gm
+       bm  Adjust red, green and blue midtones (medium pixels).
+
+       rh
+       gh
+       bh  Adjust red, green and blue highlights (brightest pixels).
+
+	   Allowed ranges for options are "[-1.0, 1.0]". Defaults are 0.
+
+       pl  Preserve lightness when changing color balance. Default is
+	   disabled.
+
+       Examples
+
+       o   Add red color cast to shadows:
+
+		   colorbalance=rs=.3
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorcontrast
+       Adjust color contrast between RGB components.
+
+       The filter accepts the following options:
+
+       rc  Set the red-cyan contrast. Defaults is 0.0. Allowed range is from
+	   -1.0 to 1.0.
+
+       gm  Set the green-magenta contrast. Defaults is 0.0. Allowed range is
+	   from -1.0 to 1.0.
+
+       by  Set the blue-yellow contrast. Defaults is 0.0. Allowed range is
+	   from -1.0 to 1.0.
+
+       rcw
+       gmw
+       byw Set the weight of each "rc", "gm", "by" option value. Default value
+	   is 0.0.  Allowed range is from 0.0 to 1.0. If all weights are 0.0
+	   filtering is disabled.
+
+       pl  Set the amount of preserving lightness. Default value is 0.0.
+	   Allowed range is from 0.0 to 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorcorrect
+       Adjust color white balance selectively for blacks and whites.  This
+       filter operates in YUV colorspace.
+
+       The filter accepts the following options:
+
+       rl  Set the red shadow spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       bl  Set the blue shadow spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       rh  Set the red highlight spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       bh  Set the blue highlight spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       saturation
+	   Set the amount of saturation. Allowed range is from -3.0 to 3.0.
+	   Default value is 1.
+
+       analyze
+	   If set to anything other than "manual" it will analyze every frame
+	   and use derived parameters for filtering output frame.
+
+	   Possible values are:
+
+	   manual
+	   average
+	   minmax
+	   median
+
+	   Default value is "manual".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorchannelmixer
+       Adjust video input frames by re-mixing color channels.
+
+       This filter modifies a color channel by adding the values associated to
+       the other channels of the same pixels. For example if the value to
+       modify is red, the output value will be:
+
+	       <red>=<red>*<rr> + <blue>*<rb> + <green>*<rg> + <alpha>*<ra>
+
+       The filter accepts the following options:
+
+       rr
+       rg
+       rb
+       ra  Adjust contribution of input red, green, blue and alpha channels
+	   for output red channel.  Default is 1 for rr, and 0 for rg, rb and
+	   ra.
+
+       gr
+       gg
+       gb
+       ga  Adjust contribution of input red, green, blue and alpha channels
+	   for output green channel.  Default is 1 for gg, and 0 for gr, gb
+	   and ga.
+
+       br
+       bg
+       bb
+       ba  Adjust contribution of input red, green, blue and alpha channels
+	   for output blue channel.  Default is 1 for bb, and 0 for br, bg and
+	   ba.
+
+       ar
+       ag
+       ab
+       aa  Adjust contribution of input red, green, blue and alpha channels
+	   for output alpha channel.  Default is 1 for aa, and 0 for ar, ag
+	   and ab.
+
+	   Allowed ranges for options are "[-2.0, 2.0]".
+
+       pc  Set preserve color mode. The accepted values are:
+
+	   none
+	       Disable color preserving, this is default.
+
+	   lum Preserve luminance.
+
+	   max Preserve max value of RGB triplet.
+
+	   avg Preserve average value of RGB triplet.
+
+	   sum Preserve sum value of RGB triplet.
+
+	   nrm Preserve normalized value of RGB triplet.
+
+	   pwr Preserve power value of RGB triplet.
+
+       pa  Set the preserve color amount when changing colors. Allowed range
+	   is from "[0.0, 1.0]".  Default is 0.0, thus disabled.
+
+       Examples
+
+       o   Convert source to grayscale:
+
+		   colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3
+
+       o   Simulate sepia tones:
+
+		   colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorize
+       Overlay a solid color on the video stream.
+
+       The filter accepts the following options:
+
+       hue Set the color hue. Allowed range is from 0 to 360.  Default value
+	   is 0.
+
+       saturation
+	   Set the color saturation. Allowed range is from 0 to 1.  Default
+	   value is 0.5.
+
+       lightness
+	   Set the color lightness. Allowed range is from 0 to 1.  Default
+	   value is 0.5.
+
+       mix Set the mix of source lightness. By default is set to 1.0.  Allowed
+	   range is from 0.0 to 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorkey
+       RGB colorspace color keying.  This filter operates on 8-bit RGB format
+       frames by setting the alpha component of each pixel which falls within
+       the similarity radius of the key color to 0. The alpha value for pixels
+       outside the similarity radius depends on the value of the blend option.
+
+       The filter accepts the following options:
+
+       color
+	   Set the color for which alpha will be set to 0 (full transparency).
+	   See "Color" section in the ffmpeg-utils manual.  Default is
+	   "black".
+
+       similarity
+	   Set the radius from the key color within which other colors also
+	   have full transparency.  The computed distance is related to the
+	   unit fractional distance in 3D space between the RGB values of the
+	   key color and the pixel's color. Range is 0.01 to 1.0. 0.01 matches
+	   within a very small radius around the exact key color, while 1.0
+	   matches everything.	Default is 0.01.
+
+       blend
+	   Set how the alpha value for pixels that fall outside the similarity
+	   radius is computed.	0.0 makes pixels either fully transparent or
+	   fully opaque.  Higher values result in semi-transparent pixels,
+	   with greater transparency the more similar the pixel color is to
+	   the key color.  Range is 0.0 to 1.0. Default is 0.0.
+
+       Examples
+
+       o   Make every green pixel in the input image transparent:
+
+		   ffmpeg -i input.png -vf colorkey=green out.png
+
+       o   Overlay a greenscreen-video on top of a static background image.
+
+		   ffmpeg -i background.png -i video.mp4 -filter_complex "[1:v]colorkey=0x3BBD1E:0.3:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.flv
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   colorhold
+       Remove all color information for all RGB colors except for certain one.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will not be replaced with neutral gray.
+
+       similarity
+	   Similarity percentage with the above color.	0.01 matches only the
+	   exact key color, while 1.0 matches everything.
+
+       blend
+	   Blend percentage. 0.0 makes pixels fully gray.  Higher values
+	   result in more preserved color.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   colorlevels
+       Adjust video input frames using levels.
+
+       The filter accepts the following options:
+
+       rimin
+       gimin
+       bimin
+       aimin
+	   Adjust red, green, blue and alpha input black point.  Allowed
+	   ranges for options are "[-1.0, 1.0]". Defaults are 0.
+
+       rimax
+       gimax
+       bimax
+       aimax
+	   Adjust red, green, blue and alpha input white point.  Allowed
+	   ranges for options are "[-1.0, 1.0]". Defaults are 1.
+
+	   Input levels are used to lighten highlights (bright tones), darken
+	   shadows (dark tones), change the balance of bright and dark tones.
+
+       romin
+       gomin
+       bomin
+       aomin
+	   Adjust red, green, blue and alpha output black point.  Allowed
+	   ranges for options are "[0, 1.0]". Defaults are 0.
+
+       romax
+       gomax
+       bomax
+       aomax
+	   Adjust red, green, blue and alpha output white point.  Allowed
+	   ranges for options are "[0, 1.0]". Defaults are 1.
+
+	   Output levels allows manual selection of a constrained output level
+	   range.
+
+       preserve
+	   Set preserve color mode. The accepted values are:
+
+	   none
+	       Disable color preserving, this is default.
+
+	   lum Preserve luminance.
+
+	   max Preserve max value of RGB triplet.
+
+	   avg Preserve average value of RGB triplet.
+
+	   sum Preserve sum value of RGB triplet.
+
+	   nrm Preserve normalized value of RGB triplet.
+
+	   pwr Preserve power value of RGB triplet.
+
+       Examples
+
+       o   Make video output darker:
+
+		   colorlevels=rimin=0.058:gimin=0.058:bimin=0.058
+
+       o   Increase contrast:
+
+		   colorlevels=rimin=0.039:gimin=0.039:bimin=0.039:rimax=0.96:gimax=0.96:bimax=0.96
+
+       o   Make video output lighter:
+
+		   colorlevels=rimax=0.902:gimax=0.902:bimax=0.902
+
+       o   Increase brightness:
+
+		   colorlevels=romin=0.5:gomin=0.5:bomin=0.5
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colormap
+       Apply custom color maps to video stream.
+
+       This filter needs three input video streams.  First stream is video
+       stream that is going to be filtered out.  Second and third video stream
+       specify color patches for source color to target color mapping.
+
+       The filter accepts the following options:
+
+       patch_size
+	   Set the source and target video stream patch size in pixels.
+
+       nb_patches
+	   Set the max number of used patches from source and target video
+	   stream.  Default value is number of patches available in additional
+	   video streams.  Max allowed number of patches is 64.
+
+       type
+	   Set the adjustments used for target colors. Can be "relative" or
+	   "absolute".	Defaults is "absolute".
+
+       kernel
+	   Set the kernel used to measure color differences between mapped
+	   colors.
+
+	   The accepted values are:
+
+	   euclidean
+	   weuclidean
+
+	   Default is "euclidean".
+
+   colormatrix
+       Convert color matrix.
+
+       The filter accepts the following options:
+
+       src
+       dst Specify the source and destination color matrix. Both values must
+	   be specified.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt601
+	       BT.601
+
+	   bt470
+	       BT.470
+
+	   bt470bg
+	       BT.470BG
+
+	   smpte170m
+	       SMPTE-170M
+
+	   smpte240m
+	       SMPTE-240M
+
+	   bt2020
+	       BT.2020
+
+       For example to convert from BT.601 to SMPTE-240M, use the command:
+
+	       colormatrix=bt601:smpte240m
+
+   colorspace
+       Convert colorspace, transfer characteristics or color primaries.  Input
+       video needs to have an even size.
+
+       The filter accepts the following options:
+
+       all Specify all color properties at once.
+
+	   The accepted values are:
+
+	   bt470m
+	       BT.470M
+
+	   bt470bg
+	       BT.470BG
+
+	   bt601-6-525
+	       BT.601-6 525
+
+	   bt601-6-625
+	       BT.601-6 625
+
+	   bt709
+	       BT.709
+
+	   smpte170m
+	       SMPTE-170M
+
+	   smpte240m
+	       SMPTE-240M
+
+	   bt2020
+	       BT.2020
+
+       space
+	   Specify output colorspace.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt470bg
+	       BT.470BG or BT.601-6 625
+
+	   smpte170m
+	       SMPTE-170M or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   ycgco
+	       YCgCo
+
+	   bt2020ncl
+	       BT.2020 with non-constant luminance
+
+       trc Specify output transfer characteristics.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   bt470m
+	       BT.470M
+
+	   bt470bg
+	       BT.470BG
+
+	   gamma22
+	       Constant gamma of 2.2
+
+	   gamma28
+	       Constant gamma of 2.8
+
+	   smpte170m
+	       SMPTE-170M, BT.601-6 625 or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   srgb
+	       SRGB
+
+	   iec61966-2-1
+	       iec61966-2-1
+
+	   iec61966-2-4
+	       iec61966-2-4
+
+	   xvycc
+	       xvycc
+
+	   bt2020-10
+	       BT.2020 for 10-bits content
+
+	   bt2020-12
+	       BT.2020 for 12-bits content
+
+       primaries
+	   Specify output color primaries.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   bt470m
+	       BT.470M
+
+	   bt470bg
+	       BT.470BG or BT.601-6 625
+
+	   smpte170m
+	       SMPTE-170M or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   film
+	       film
+
+	   smpte431
+	       SMPTE-431
+
+	   smpte432
+	       SMPTE-432
+
+	   bt2020
+	       BT.2020
+
+	   jedec-p22
+	       JEDEC P22 phosphors
+
+       range
+	   Specify output color range.
+
+	   The accepted values are:
+
+	   tv  TV (restricted) range
+
+	   mpeg
+	       MPEG (restricted) range
+
+	   pc  PC (full) range
+
+	   jpeg
+	       JPEG (full) range
+
+       format
+	   Specify output color format.
+
+	   The accepted values are:
+
+	   yuv420p
+	       YUV 4:2:0 planar 8-bits
+
+	   yuv420p10
+	       YUV 4:2:0 planar 10-bits
+
+	   yuv420p12
+	       YUV 4:2:0 planar 12-bits
+
+	   yuv422p
+	       YUV 4:2:2 planar 8-bits
+
+	   yuv422p10
+	       YUV 4:2:2 planar 10-bits
+
+	   yuv422p12
+	       YUV 4:2:2 planar 12-bits
+
+	   yuv444p
+	       YUV 4:4:4 planar 8-bits
+
+	   yuv444p10
+	       YUV 4:4:4 planar 10-bits
+
+	   yuv444p12
+	       YUV 4:4:4 planar 12-bits
+
+       fast
+	   Do a fast conversion, which skips gamma/primary correction. This
+	   will take significantly less CPU, but will be mathematically
+	   incorrect. To get output compatible with that produced by the
+	   colormatrix filter, use fast=1.
+
+       dither
+	   Specify dithering mode.
+
+	   The accepted values are:
+
+	   none
+	       No dithering
+
+	   fsb Floyd-Steinberg dithering
+
+       wpadapt
+	   Whitepoint adaptation mode.
+
+	   The accepted values are:
+
+	   bradford
+	       Bradford whitepoint adaptation
+
+	   vonkries
+	       von Kries whitepoint adaptation
+
+	   identity
+	       identity whitepoint adaptation (i.e. no whitepoint adaptation)
+
+       iall
+	   Override all input properties at once. Same accepted values as all.
+
+       ispace
+	   Override input colorspace. Same accepted values as space.
+
+       iprimaries
+	   Override input color primaries. Same accepted values as primaries.
+
+       itrc
+	   Override input transfer characteristics. Same accepted values as
+	   trc.
+
+       irange
+	   Override input color range. Same accepted values as range.
+
+       The filter converts the transfer characteristics, color space and color
+       primaries to the specified user values. The output value, if not
+       specified, is set to a default value based on the "all" property. If
+       that property is also not specified, the filter will log an error. The
+       output color range and format default to the same value as the input
+       color range and format. The input transfer characteristics, color
+       space, color primaries and color range should be set on the input data.
+       If any of these are missing, the filter will log an error and no
+       conversion will take place.
+
+       For example to convert the input to SMPTE-240M, use the command:
+
+	       colorspace=smpte240m
+
+   colorspace_cuda
+       CUDA accelerated implementation of the colorspace filter.
+
+       It is by no means feature complete compared to the software colorspace
+       filter, and at the current time only supports color range conversion
+       between jpeg/full and mpeg/limited range.
+
+       The filter accepts the following options:
+
+       range
+	   Specify output color range.
+
+	   The accepted values are:
+
+	   tv  TV (restricted) range
+
+	   mpeg
+	       MPEG (restricted) range
+
+	   pc  PC (full) range
+
+	   jpeg
+	       JPEG (full) range
+
+   colortemperature
+       Adjust color temperature in video to simulate variations in ambient
+       color temperature.
+
+       The filter accepts the following options:
+
+       temperature
+	   Set the temperature in Kelvin. Allowed range is from 1000 to 40000.
+	   Default value is 6500 K.
+
+       mix Set mixing with filtered output. Allowed range is from 0 to 1.
+	   Default value is 1.
+
+       pl  Set the amount of preserving lightness. Allowed range is from 0 to
+	   1.  Default value is 0.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   convolution
+       Apply convolution of 3x3, 5x5, 7x7 or horizontal/vertical up to 49
+       elements.
+
+       The filter accepts the following options:
+
+       0m
+       1m
+       2m
+       3m  Set matrix for each plane.  Matrix is sequence of 9, 25 or 49
+	   signed integers in square mode, and from 1 to 49 odd number of
+	   signed integers in row mode.
+
+       0rdiv
+       1rdiv
+       2rdiv
+       3rdiv
+	   Set multiplier for calculated value for each plane.	If unset or 0,
+	   it will be 1/sum of all matrix elements.
+
+       0bias
+       1bias
+       2bias
+       3bias
+	   Set bias for each plane. This value is added to the result of the
+	   multiplication.  Useful for making the overall image brighter or
+	   darker. Default is 0.0.
+
+       0mode
+       1mode
+       2mode
+       3mode
+	   Set matrix mode for each plane. Can be square, row or column.
+	   Default is square.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Apply sharpen:
+
+		   convolution="0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0"
+
+       o   Apply blur:
+
+		   convolution="1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1/9:1/9:1/9:1/9"
+
+       o   Apply edge enhance:
+
+		   convolution="0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128"
+
+       o   Apply edge detect:
+
+		   convolution="0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128"
+
+       o   Apply laplacian edge detector which includes diagonals:
+
+		   convolution="1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:5:5:5:1:0:128:128:0"
+
+       o   Apply emboss:
+
+		   convolution="-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2"
+
+   convolve
+       Apply 2D convolution of video stream in frequency domain using second
+       stream as impulse.
+
+       The filter accepts the following options:
+
+       planes
+	   Set which planes to process.
+
+       impulse
+	   Set which impulse video frames will be processed, can be first or
+	   all. Default is all.
+
+       The "convolve" filter also supports the framesync options.
+
+   copy
+       Copy the input video source unchanged to the output. This is mainly
+       useful for testing purposes.
+
+   coreimage
+       Video filtering on GPU using Apple's CoreImage API on OSX.
+
+       Hardware acceleration is based on an OpenGL context. Usually, this
+       means it is processed by video hardware. However, software-based OpenGL
+       implementations exist which means there is no guarantee for hardware
+       processing. It depends on the respective OSX.
+
+       There are many filters and image generators provided by Apple that come
+       with a large variety of options. The filter has to be referenced by its
+       name along with its options.
+
+       The coreimage filter accepts the following options:
+
+       list_filters
+	   List all available filters and generators along with all their
+	   respective options as well as possible minimum and maximum values
+	   along with the default values.
+
+		   list_filters=true
+
+       filter
+	   Specify all filters by their respective name and options.  Use
+	   list_filters to determine all valid filter names and options.
+	   Numerical options are specified by a float value and are
+	   automatically clamped to their respective value range.  Vector and
+	   color options have to be specified by a list of space separated
+	   float values. Character escaping has to be done.  A special option
+	   name "default" is available to use default options for a filter.
+
+	   It is required to specify either "default" or at least one of the
+	   filter options.  All omitted options are used with their default
+	   values.  The syntax of the filter string is as follows:
+
+		   filter=<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...][#<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...]][#...]
+
+       output_rect
+	   Specify a rectangle where the output of the filter chain is copied
+	   into the input image. It is given by a list of space separated
+	   float values:
+
+		   output_rect=x\ y\ width\ height
+
+	   If not given, the output rectangle equals the dimensions of the
+	   input image.  The output rectangle is automatically cropped at the
+	   borders of the input image. Negative values are valid for each
+	   component.
+
+		   output_rect=25\ 25\ 100\ 100
+
+       Several filters can be chained for successive processing without GPU-
+       HOST transfers allowing for fast processing of complex filter chains.
+       Currently, only filters with zero (generators) or exactly one (filters)
+       input image and one output image are supported. Also, transition
+       filters are not yet usable as intended.
+
+       Some filters generate output images with additional padding depending
+       on the respective filter kernel. The padding is automatically removed
+       to ensure the filter output has the same size as the input image.
+
+       For image generators, the size of the output image is determined by the
+       previous output image of the filter chain or the input image of the
+       whole filterchain, respectively. The generators do not use the pixel
+       information of this image to generate their output. However, the
+       generated output is blended onto this image, resulting in partial or
+       complete coverage of the output image.
+
+       The coreimagesrc video source can be used for generating input images
+       which are directly fed into the filter chain. By using it, providing
+       input images by another video source or an input video is not required.
+
+       Examples
+
+       o   List all filters available:
+
+		   coreimage=list_filters=true
+
+       o   Use the CIBoxBlur filter with default options to blur an image:
+
+		   coreimage=filter=CIBoxBlur@default
+
+       o   Use a filter chain with CISepiaTone at default values and
+	   CIVignetteEffect with its center at 100x100 and a radius of 50
+	   pixels:
+
+		   coreimage=filter=CIBoxBlur@default#CIVignetteEffect@inputCenter=100\ 100@inputRadius=50
+
+       o   Use nullsrc and CIQRCodeGenerator to create a QR code for the
+	   FFmpeg homepage, given as complete and escaped command-line for
+	   Apple's standard bash shell:
+
+		   ffmpeg -f lavfi -i nullsrc=s=100x100,coreimage=filter=CIQRCodeGenerator@inputMessage=https\\\\\://FFmpeg.org/@inputCorrectionLevel=H -frames:v 1 QRCode.png
+
+   corr
+       Obtain the correlation between two input videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained per component, average, min and max correlation is printed
+       through the logging system.
+
+       The filter stores the calculated correlation of each frame in frame
+       metadata.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi corr -f null -
+
+   cover_rect
+       Cover a rectangular object
+
+       It accepts the following options:
+
+       cover
+	   Filepath of the optional cover image, needs to be in yuv420.
+
+       mode
+	   Set covering mode.
+
+	   It accepts the following values:
+
+	   cover
+	       cover it by the supplied image
+
+	   blur
+	       cover it by interpolating the surrounding pixels
+
+	   Default value is blur.
+
+       Examples
+
+       o   Cover a rectangular object by the supplied image of a given video
+	   using ffmpeg:
+
+		   ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv
+
+   crop
+       Crop the input video to given dimensions.
+
+       It accepts the following parameters:
+
+       w, out_w
+	   The width of the output video. It defaults to "iw".	This
+	   expression is evaluated only once during the filter configuration,
+	   or when the w or out_w command is sent.
+
+       h, out_h
+	   The height of the output video. It defaults to "ih".  This
+	   expression is evaluated only once during the filter configuration,
+	   or when the h or out_h command is sent.
+
+       x   The horizontal position, in the input video, of the left edge of
+	   the output video. It defaults to "(in_w-out_w)/2".  This expression
+	   is evaluated per-frame.
+
+       y   The vertical position, in the input video, of the top edge of the
+	   output video.  It defaults to "(in_h-out_h)/2".  This expression is
+	   evaluated per-frame.
+
+       keep_aspect
+	   If set to 1 will force the output display aspect ratio to be the
+	   same of the input, by changing the output sample aspect ratio. It
+	   defaults to 0.
+
+       exact
+	   Enable exact cropping. If enabled, subsampled videos will be
+	   cropped at exact width/height/x/y as specified and will not be
+	   rounded to nearest smaller value.  It defaults to 0.
+
+       The out_w, out_h, x, y parameters are expressions containing the
+       following constants:
+
+       x
+       y   The computed values for x and y. They are evaluated for each new
+	   frame.
+
+       in_w
+       in_h
+	   The input width and height.
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (cropped) width and height.
+
+       ow
+       oh  These are the same as out_w and out_h.
+
+       a   same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (iw / ih) * sar
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       n   The number of the input frame, starting from 0.
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       t   The timestamp expressed in seconds. It's NAN if the input timestamp
+	   is unknown.
+
+       The expression for out_w may depend on the value of out_h, and the
+       expression for out_h may depend on out_w, but they cannot depend on x
+       and y, as x and y are evaluated after out_w and out_h.
+
+       The x and y parameters specify the expressions for the position of the
+       top-left corner of the output (non-cropped) area. They are evaluated
+       for each frame. If the evaluated value is not valid, it is approximated
+       to the nearest valid value.
+
+       The expression for x may depend on y, and the expression for y may
+       depend on x.
+
+       Examples
+
+       o   Crop area with size 100x100 at position (12,34).
+
+		   crop=100:100:12:34
+
+	   Using named options, the example above becomes:
+
+		   crop=w=100:h=100:x=12:y=34
+
+       o   Crop the central input area with size 100x100:
+
+		   crop=100:100
+
+       o   Crop the central input area with size 2/3 of the input video:
+
+		   crop=2/3*in_w:2/3*in_h
+
+       o   Crop the input video central square:
+
+		   crop=out_w=in_h
+		   crop=in_h
+
+       o   Delimit the rectangle with the top-left corner placed at position
+	   100:100 and the right-bottom corner corresponding to the right-
+	   bottom corner of the input image.
+
+		   crop=in_w-100:in_h-100:100:100
+
+       o   Crop 10 pixels from the left and right borders, and 20 pixels from
+	   the top and bottom borders
+
+		   crop=in_w-2*10:in_h-2*20
+
+       o   Keep only the bottom right quarter of the input image:
+
+		   crop=in_w/2:in_h/2:in_w/2:in_h/2
+
+       o   Crop height for getting Greek harmony:
+
+		   crop=in_w:1/PHI*in_w
+
+       o   Apply trembling effect:
+
+		   crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)
+
+       o   Apply erratic camera effect depending on timestamp:
+
+		   crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(t*10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t*13)
+
+       o   Set x depending on the value of y:
+
+		   crop=in_w/2:in_h/2:y:10+10*sin(n/10)
+
+       Commands
+
+       This filter supports the following commands:
+
+       w, out_w
+       h, out_h
+       x
+       y   Set width/height of the output video and the horizontal/vertical
+	   position in the input video.  The command accepts the same syntax
+	   of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   cropdetect
+       Auto-detect the crop size.
+
+       It calculates the necessary cropping parameters and prints the
+       recommended parameters via the logging system. The detected dimensions
+       correspond to the non-black or video area of the input video according
+       to mode.
+
+       It accepts the following parameters:
+
+       mode
+	   Depending on mode crop detection is based on either the mere black
+	   value of surrounding pixels or a combination of motion vectors and
+	   edge pixels.
+
+	   black
+	       Detect black pixels surrounding the playing video. For fine
+	       control use option limit.
+
+	   mvedges
+	       Detect the playing video by the motion vectors inside the video
+	       and scanning for edge pixels typically forming the border of a
+	       playing video.
+
+       limit
+	   Set higher black value threshold, which can be optionally specified
+	   from nothing (0) to everything (255 for 8-bit based formats). An
+	   intensity value greater to the set value is considered non-black.
+	   It defaults to 24.  You can also specify a value between 0.0 and
+	   1.0 which will be scaled depending on the bitdepth of the pixel
+	   format.
+
+       round
+	   The value which the width/height should be divisible by. It
+	   defaults to 16. The offset is automatically adjusted to center the
+	   video. Use 2 to get only even dimensions (needed for 4:2:2 video).
+	   16 is best when encoding to most video codecs.
+
+       skip
+	   Set the number of initial frames for which evaluation is skipped.
+	   Default is 2. Range is 0 to INT_MAX.
+
+       reset_count, reset
+	   Set the counter that determines after how many frames cropdetect
+	   will reset the previously detected largest video area and start
+	   over to detect the current optimal crop area. Default value is 0.
+
+	   This can be useful when channel logos distort the video area. 0
+	   indicates 'never reset', and returns the largest area encountered
+	   during playback.
+
+       mv_threshold
+	   Set motion in pixel units as threshold for motion detection. It
+	   defaults to 8.
+
+       low
+       high
+	   Set low and high threshold values used by the Canny thresholding
+	   algorithm.
+
+	   The high threshold selects the "strong" edge pixels, which are then
+	   connected through 8-connectivity with the "weak" edge pixels
+	   selected by the low threshold.
+
+	   low and high threshold values must be chosen in the range [0,1],
+	   and low should be lesser or equal to high.
+
+	   Default value for low is "5/255", and default value for high is
+	   "15/255".
+
+       Examples
+
+       o   Find video area surrounded by black borders:
+
+		   ffmpeg -i file.mp4 -vf cropdetect,metadata=mode=print -f null -
+
+       o   Find an embedded video area, generate motion vectors beforehand:
+
+		   ffmpeg -i file.mp4 -vf mestimate,cropdetect=mode=mvedges,metadata=mode=print -f null -
+
+       o   Find an embedded video area, use motion vectors from decoder:
+
+		   ffmpeg -flags2 +export_mvs -i file.mp4 -vf cropdetect=mode=mvedges,metadata=mode=print -f null -
+
+       Commands
+
+       This filter supports the following commands:
+
+       limit
+	   The command accepts the same syntax of the corresponding option.
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   cue
+       Delay video filtering until a given wallclock timestamp. The filter
+       first passes on preroll amount of frames, then it buffers at most
+       buffer amount of frames and waits for the cue. After reaching the cue
+       it forwards the buffered frames and also any subsequent frames coming
+       in its input.
+
+       The filter can be used synchronize the output of multiple ffmpeg
+       processes for realtime output devices like decklink. By putting the
+       delay in the filtering chain and pre-buffering frames the process can
+       pass on data to output almost immediately after the target wallclock
+       timestamp is reached.
+
+       Perfect frame accuracy cannot be guaranteed, but the result is good
+       enough for some use cases.
+
+       cue The cue timestamp expressed in a UNIX timestamp in microseconds.
+	   Default is 0.
+
+       preroll
+	   The duration of content to pass on as preroll expressed in seconds.
+	   Default is 0.
+
+       buffer
+	   The maximum duration of content to buffer before waiting for the
+	   cue expressed in seconds. Default is 0.
+
+   curves
+       Apply color adjustments using curves.
+
+       This filter is similar to the Adobe Photoshop and GIMP curves tools.
+       Each component (red, green and blue) has its values defined by N key
+       points tied from each other using a smooth curve. The x-axis represents
+       the pixel values from the input frame, and the y-axis the new pixel
+       values to be set for the output frame.
+
+       By default, a component curve is defined by the two points (0;0) and
+       (1;1). This creates a straight line where each original pixel value is
+       "adjusted" to its own value, which means no change to the image.
+
+       The filter allows you to redefine these two points and add some more. A
+       new curve will be define to pass smoothly through all these new
+       coordinates. The new defined points needs to be strictly increasing
+       over the x-axis, and their x and y values must be in the [0;1]
+       interval. The curve is formed by using a natural or monotonic cubic
+       spline interpolation, depending on the interp option (default:
+       "natural"). The "natural" spline produces a smoother curve in general
+       while the monotonic ("pchip") spline guarantees the transitions between
+       the specified points to be monotonic. If the computed curves happened
+       to go outside the vector spaces, the values will be clipped
+       accordingly.
+
+       The filter accepts the following options:
+
+       preset
+	   Select one of the available color presets. This option can be used
+	   in addition to the r, g, b parameters; in this case, the later
+	   options takes priority on the preset values.  Available presets
+	   are:
+
+	   none
+	   color_negative
+	   cross_process
+	   darker
+	   increase_contrast
+	   lighter
+	   linear_contrast
+	   medium_contrast
+	   negative
+	   strong_contrast
+	   vintage
+
+	   Default is "none".
+
+       master, m
+	   Set the master key points. These points will define a second pass
+	   mapping. It is sometimes called a "luminance" or "value" mapping.
+	   It can be used with r, g, b or all since it acts like a post-
+	   processing LUT.
+
+       red, r
+	   Set the key points for the red component.
+
+       green, g
+	   Set the key points for the green component.
+
+       blue, b
+	   Set the key points for the blue component.
+
+       all Set the key points for all components (not including master).  Can
+	   be used in addition to the other key points component options. In
+	   this case, the unset component(s) will fallback on this all
+	   setting.
+
+       psfile
+	   Specify a Photoshop curves file (".acv") to import the settings
+	   from.
+
+       plot
+	   Save Gnuplot script of the curves in specified file.
+
+       interp
+	   Specify the kind of interpolation. Available algorithms are:
+
+	   natural
+	       Natural cubic spline using a piece-wise cubic polynomial that
+	       is twice continuously differentiable.
+
+	   pchip
+	       Monotonic cubic spline using a piecewise cubic Hermite
+	       interpolating polynomial (PCHIP).
+
+       To avoid some filtergraph syntax conflicts, each key points list need
+       to be defined using the following syntax: "x0/y0 x1/y1 x2/y2 ...".
+
+       Commands
+
+       This filter supports same commands as options.
+
+       Examples
+
+       o   Increase slightly the middle level of blue:
+
+		   curves=blue='0/0 0.5/0.58 1/1'
+
+       o   Vintage effect:
+
+		   curves=r='0/0.11 .42/.51 1/0.95':g='0/0 0.50/0.48 1/1':b='0/0.22 .49/.44 1/0.8'
+
+	   Here we obtain the following coordinates for each components:
+
+	   red "(0;0.11) (0.42;0.51) (1;0.95)"
+
+	   green
+	       "(0;0) (0.50;0.48) (1;1)"
+
+	   blue
+	       "(0;0.22) (0.49;0.44) (1;0.80)"
+
+       o   The previous example can also be achieved with the associated
+	   built-in preset:
+
+		   curves=preset=vintage
+
+       o   Or simply:
+
+		   curves=vintage
+
+       o   Use a Photoshop preset and redefine the points of the green
+	   component:
+
+		   curves=psfile='MyCurvesPresets/purple.acv':green='0/0 0.45/0.53 1/1'
+
+       o   Check out the curves of the "cross_process" profile using ffmpeg
+	   and gnuplot:
+
+		   ffmpeg -f lavfi -i color -vf curves=cross_process:plot=/tmp/curves.plt -frames:v 1 -f null -
+		   gnuplot -p /tmp/curves.plt
+
+   datascope
+       Video data analysis filter.
+
+       This filter shows hexadecimal pixel values of part of video.
+
+       The filter accepts the following options:
+
+       size, s
+	   Set output video size.
+
+       x   Set x offset from where to pick pixels.
+
+       y   Set y offset from where to pick pixels.
+
+       mode
+	   Set scope mode, can be one of the following:
+
+	   mono
+	       Draw hexadecimal pixel values with white color on black
+	       background.
+
+	   color
+	       Draw hexadecimal pixel values with input video pixel color on
+	       black background.
+
+	   color2
+	       Draw hexadecimal pixel values on color background picked from
+	       input video, the text color is picked in such way so its always
+	       visible.
+
+       axis
+	   Draw rows and columns numbers on left and top of video.
+
+       opacity
+	   Set background opacity.
+
+       format
+	   Set display number format. Can be "hex", or "dec". Default is
+	   "hex".
+
+       components
+	   Set pixel components to display. By default all pixel components
+	   are displayed.
+
+       Commands
+
+       This filter supports same commands as options excluding "size" option.
+
+   dblur
+       Apply Directional blur filter.
+
+       The filter accepts the following options:
+
+       angle
+	   Set angle of directional blur. Default is 45.
+
+       radius
+	   Set radius of directional blur. Default is 5.
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   dctdnoiz
+       Denoise frames using 2D DCT (frequency domain filtering).
+
+       This filter is not designed for real time.
+
+       The filter accepts the following options:
+
+       sigma, s
+	   Set the noise sigma constant.
+
+	   This sigma defines a hard threshold of "3 * sigma"; every DCT
+	   coefficient (absolute value) below this threshold with be dropped.
+
+	   If you need a more advanced filtering, see expr.
+
+	   Default is 0.
+
+       overlap
+	   Set number overlapping pixels for each block. Since the filter can
+	   be slow, you may want to reduce this value, at the cost of a less
+	   effective filter and the risk of various artefacts.
+
+	   If the overlapping value doesn't permit processing the whole input
+	   width or height, a warning will be displayed and according borders
+	   won't be denoised.
+
+	   Default value is blocksize-1, which is the best possible setting.
+
+       expr, e
+	   Set the coefficient factor expression.
+
+	   For each coefficient of a DCT block, this expression will be
+	   evaluated as a multiplier value for the coefficient.
+
+	   If this is option is set, the sigma option will be ignored.
+
+	   The absolute value of the coefficient can be accessed through the c
+	   variable.
+
+       n   Set the blocksize using the number of bits. "1<<n" defines the
+	   blocksize, which is the width and height of the processed blocks.
+
+	   The default value is 3 (8x8) and can be raised to 4 for a blocksize
+	   of 16x16. Note that changing this setting has huge consequences on
+	   the speed processing. Also, a larger block size does not
+	   necessarily means a better de-noising.
+
+       Examples
+
+       Apply a denoise with a sigma of 4.5:
+
+	       dctdnoiz=4.5
+
+       The same operation can be achieved using the expression system:
+
+	       dctdnoiz=e='gte(c, 4.5*3)'
+
+       Violent denoise using a block size of "16x16":
+
+	       dctdnoiz=15:n=4
+
+   deband
+       Remove banding artifacts from input video.  It works by replacing
+       banded pixels with average value of referenced pixels.
+
+       The filter accepts the following options:
+
+       1thr
+       2thr
+       3thr
+       4thr
+	   Set banding detection threshold for each plane. Default is 0.02.
+	   Valid range is 0.00003 to 0.5.  If difference between current pixel
+	   and reference pixel is less than threshold, it will be considered
+	   as banded.
+
+       range, r
+	   Banding detection range in pixels. Default is 16. If positive,
+	   random number in range 0 to set value will be used. If negative,
+	   exact absolute value will be used.  The range defines square of
+	   four pixels around current pixel.
+
+       direction, d
+	   Set direction in radians from which four pixel will be compared. If
+	   positive, random direction from 0 to set direction will be picked.
+	   If negative, exact of absolute value will be picked. For example
+	   direction 0, -PI or -2*PI radians will pick only pixels on same row
+	   and -PI/2 will pick only pixels on same column.
+
+       blur, b
+	   If enabled, current pixel is compared with average value of all
+	   four surrounding pixels. The default is enabled. If disabled
+	   current pixel is compared with all four surrounding pixels. The
+	   pixel is considered banded if only all four differences with
+	   surrounding pixels are less than threshold.
+
+       coupling, c
+	   If enabled, current pixel is changed if and only if all pixel
+	   components are banded, e.g. banding detection threshold is
+	   triggered for all color components.	The default is disabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   deblock
+       Remove blocking artifacts from input video.
+
+       The filter accepts the following options:
+
+       filter
+	   Set filter type, can be weak or strong. Default is strong.  This
+	   controls what kind of deblocking is applied.
+
+       block
+	   Set size of block, allowed range is from 4 to 512. Default is 8.
+
+       alpha
+       beta
+       gamma
+       delta
+	   Set blocking detection thresholds. Allowed range is 0 to 1.
+	   Defaults are: 0.098 for alpha and 0.05 for the rest.  Using higher
+	   threshold gives more deblocking strength.  Setting alpha controls
+	   threshold detection at exact edge of block.	Remaining options
+	   controls threshold detection near the edge. Each one for
+	   below/above or left/right. Setting any of those to 0 disables
+	   deblocking.
+
+       planes
+	   Set planes to filter. Default is to filter all available planes.
+
+       Examples
+
+       o   Deblock using weak filter and block size of 4 pixels.
+
+		   deblock=filter=weak:block=4
+
+       o   Deblock using strong filter, block size of 4 pixels and custom
+	   thresholds for deblocking more edges.
+
+		   deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05
+
+       o   Similar as above, but filter only first plane.
+
+		   deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=1
+
+       o   Similar as above, but filter only second and third plane.
+
+		   deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=6
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   decimate
+       Drop duplicated frames at regular intervals.
+
+       The filter accepts the following options:
+
+       cycle
+	   Set the number of frames from which one will be dropped. Setting
+	   this to N means one frame in every batch of N frames will be
+	   dropped.  Default is 5.
+
+       dupthresh
+	   Set the threshold for duplicate detection. If the difference metric
+	   for a frame is less than or equal to this value, then it is
+	   declared as duplicate. Default is 1.1
+
+       scthresh
+	   Set scene change threshold. Default is 15.
+
+       blockx
+       blocky
+	   Set the size of the x and y-axis blocks used during metric
+	   calculations.  Larger blocks give better noise suppression, but
+	   also give worse detection of small movements. Must be a power of
+	   two. Default is 32.
+
+       ppsrc
+	   Mark main input as a pre-processed input and activate clean source
+	   input stream. This allows the input to be pre-processed with
+	   various filters to help the metrics calculation while keeping the
+	   frame selection lossless. When set to 1, the first stream is for
+	   the pre-processed input, and the second stream is the clean source
+	   from where the kept frames are chosen. Default is 0.
+
+       chroma
+	   Set whether or not chroma is considered in the metric calculations.
+	   Default is 1.
+
+       mixed
+	   Set whether or not the input only partially contains content to be
+	   decimated.  Default is "false".  If enabled video output stream
+	   will be in variable frame rate.
+
+   deconvolve
+       Apply 2D deconvolution of video stream in frequency domain using second
+       stream as impulse.
+
+       The filter accepts the following options:
+
+       planes
+	   Set which planes to process.
+
+       impulse
+	   Set which impulse video frames will be processed, can be first or
+	   all. Default is all.
+
+       noise
+	   Set noise when doing divisions. Default is 0.0000001. Useful when
+	   width and height are not same and not power of 2 or if stream prior
+	   to convolving had noise.
+
+       The "deconvolve" filter also supports the framesync options.
+
+   dedot
+       Reduce cross-luminance (dot-crawl) and cross-color (rainbows) from
+       video.
+
+       It accepts the following options:
+
+       m   Set mode of operation. Can be combination of dotcrawl for cross-
+	   luminance reduction and/or rainbows for cross-color reduction.
+
+       lt  Set spatial luma threshold. Lower values increases reduction of
+	   cross-luminance.
+
+       tl  Set tolerance for temporal luma. Higher values increases reduction
+	   of cross-luminance.
+
+       tc  Set tolerance for chroma temporal variation. Higher values
+	   increases reduction of cross-color.
+
+       ct  Set temporal chroma threshold. Lower values increases reduction of
+	   cross-color.
+
+   deflate
+       Apply deflate effect to the video.
+
+       This filter replaces the pixel by the local(3x3) average by taking into
+       account only values lower than the pixel.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   deflicker
+       Remove temporal frame luminance variations.
+
+       It accepts the following options:
+
+       size, s
+	   Set moving-average filter size in frames. Default is 5. Allowed
+	   range is 2 - 129.
+
+       mode, m
+	   Set averaging mode to smooth temporal luminance variations.
+
+	   Available values are:
+
+	   am  Arithmetic mean
+
+	   gm  Geometric mean
+
+	   hm  Harmonic mean
+
+	   qm  Quadratic mean
+
+	   cm  Cubic mean
+
+	   pm  Power mean
+
+	   median
+	       Median
+
+       bypass
+	   Do not actually modify frame. Useful when one only wants metadata.
+
+   dejudder
+       Remove judder produced by partially interlaced telecined content.
+
+       Judder can be introduced, for instance, by pullup filter. If the
+       original source was partially telecined content then the output of
+       "pullup,dejudder" will have a variable frame rate. May change the
+       recorded frame rate of the container. Aside from that change, this
+       filter will not affect constant frame rate video.
+
+       The option available in this filter is:
+
+       cycle
+	   Specify the length of the window over which the judder repeats.
+
+	   Accepts any integer greater than 1. Useful values are:
+
+	   4   If the original was telecined from 24 to 30 fps (Film to NTSC).
+
+	   5   If the original was telecined from 25 to 30 fps (PAL to NTSC).
+
+	   20  If a mixture of the two.
+
+	   The default is 4.
+
+   delogo
+       Suppress a TV station logo by a simple interpolation of the surrounding
+       pixels. Just set a rectangle covering the logo and watch it disappear
+       (and sometimes something even uglier appear - your mileage may vary).
+
+       It accepts the following parameters:
+
+       x
+       y   Specify the top left corner coordinates of the logo. They must be
+	   specified.
+
+       w
+       h   Specify the width and height of the logo to clear. They must be
+	   specified.
+
+       show
+	   When set to 1, a green rectangle is drawn on the screen to simplify
+	   finding the right x, y, w, and h parameters.  The default value is
+	   0.
+
+	   The rectangle is drawn on the outermost pixels which will be
+	   (partly) replaced with interpolated values. The values of the next
+	   pixels immediately outside this rectangle in each direction will be
+	   used to compute the interpolated pixel values inside the rectangle.
+
+       Examples
+
+       o   Set a rectangle covering the area with top left corner coordinates
+	   0,0 and size 100x77:
+
+		   delogo=x=0:y=0:w=100:h=77
+
+   derain
+       Remove the rain in the input image/video by applying the derain methods
+       based on convolutional neural networks. Supported models:
+
+       o   Recurrent Squeeze-and-Excitation Context Aggregation Net (RESCAN).
+	   See
+	   <http://openaccess.thecvf.com/content_ECCV_2018/papers/Xia_Li_Recurrent_Squeeze-and-Excitation_Context_ECCV_2018_paper.pdf>.
+
+       Training as well as model generation scripts are provided in the
+       repository at <https://github.com/XueweiMeng/derain_filter.git>.
+
+       The filter accepts the following options:
+
+       filter_type
+	   Specify which filter to use. This option accepts the following
+	   values:
+
+	   derain
+	       Derain filter. To conduct derain filter, you need to use a
+	       derain model.
+
+	   dehaze
+	       Dehaze filter. To conduct dehaze filter, you need to use a
+	       dehaze model.
+
+	   Default value is derain.
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts the following values:
+
+	   tensorflow
+	       TensorFlow backend. To enable this backend you need to install
+	       the TensorFlow for C library (see
+	       <https://www.tensorflow.org/install/lang_c>) and configure
+	       FFmpeg with "--enable-libtensorflow"
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats. TensorFlow can load files for only its format.
+
+       To get full functionality (such as async execution), please use the
+       dnn_processing filter.
+
+   deshake
+       Attempt to fix small changes in horizontal and/or vertical shift. This
+       filter helps remove camera shake from hand-holding a camera, bumping a
+       tripod, moving on a vehicle, etc.
+
+       The filter accepts the following options:
+
+       x
+       y
+       w
+       h   Specify a rectangular area where to limit the search for motion
+	   vectors.  If desired the search for motion vectors can be limited
+	   to a rectangular area of the frame defined by its top left corner,
+	   width and height. These parameters have the same meaning as the
+	   drawbox filter which can be used to visualise the position of the
+	   bounding box.
+
+	   This is useful when simultaneous movement of subjects within the
+	   frame might be confused for camera motion by the motion vector
+	   search.
+
+	   If any or all of x, y, w and h are set to -1 then the full frame is
+	   used. This allows later options to be set without specifying the
+	   bounding box for the motion vector search.
+
+	   Default - search the whole frame.
+
+       rx
+       ry  Specify the maximum extent of movement in x and y directions in the
+	   range 0-64 pixels. Default 16.
+
+       edge
+	   Specify how to generate pixels to fill blanks at the edge of the
+	   frame. Available values are:
+
+	   blank, 0
+	       Fill zeroes at blank locations
+
+	   original, 1
+	       Original image at blank locations
+
+	   clamp, 2
+	       Extruded edge value at blank locations
+
+	   mirror, 3
+	       Mirrored edge at blank locations
+
+	   Default value is mirror.
+
+       blocksize
+	   Specify the blocksize to use for motion search. Range 4-128 pixels,
+	   default 8.
+
+       contrast
+	   Specify the contrast threshold for blocks. Only blocks with more
+	   than the specified contrast (difference between darkest and
+	   lightest pixels) will be considered. Range 1-255, default 125.
+
+       search
+	   Specify the search strategy. Available values are:
+
+	   exhaustive, 0
+	       Set exhaustive search
+
+	   less, 1
+	       Set less exhaustive search.
+
+	   Default value is exhaustive.
+
+       filename
+	   If set then a detailed log of the motion search is written to the
+	   specified file.
+
+   despill
+       Remove unwanted contamination of foreground colors, caused by reflected
+       color of greenscreen or bluescreen.
+
+       This filter accepts the following options:
+
+       type
+	   Set what type of despill to use.
+
+       mix Set how spillmap will be generated.
+
+       expand
+	   Set how much to get rid of still remaining spill.
+
+       red Controls amount of red in spill area.
+
+       green
+	   Controls amount of green in spill area.  Should be -1 for
+	   greenscreen.
+
+       blue
+	   Controls amount of blue in spill area.  Should be -1 for
+	   bluescreen.
+
+       brightness
+	   Controls brightness of spill area, preserving colors.
+
+       alpha
+	   Modify alpha from generated spillmap.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   detelecine
+       Apply an exact inverse of the telecine operation. It requires a
+       predefined pattern specified using the pattern option which must be the
+       same as that passed to the telecine filter.
+
+       This filter accepts the following options:
+
+       first_field
+	   top, t
+	       top field first
+
+	   bottom, b
+	       bottom field first The default value is "top".
+
+       pattern
+	   A string of numbers representing the pulldown pattern you wish to
+	   apply.  The default value is 23.
+
+       start_frame
+	   A number representing position of the first frame with respect to
+	   the telecine pattern. This is to be used if the stream is cut. The
+	   default value is 0.
+
+   dilation
+       Apply dilation effect to the video.
+
+       This filter replaces the pixel by the local(3x3) maximum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to. Default is 255 i.e. all
+	   eight pixels are used.
+
+	   Flags to local 3x3 coordinates maps like this:
+
+	       1 2 3
+	       4   5
+	       6 7 8
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   displace
+       Displace pixels as indicated by second and third input stream.
+
+       It takes three input streams and outputs one stream, the first input is
+       the source, and second and third input are displacement maps.
+
+       The second input specifies how much to displace pixels along the
+       x-axis, while the third input specifies how much to displace pixels
+       along the y-axis.  If one of displacement map streams terminates, last
+       frame from that displacement map will be used.
+
+       Note that once generated, displacements maps can be reused over and
+       over again.
+
+       A description of the accepted options follows.
+
+       edge
+	   Set displace behavior for pixels that are out of range.
+
+	   Available values are:
+
+	   blank
+	       Missing pixels are replaced by black pixels.
+
+	   smear
+	       Adjacent pixels will spread out to replace missing pixels.
+
+	   wrap
+	       Out of range pixels are wrapped so they point to pixels of
+	       other side.
+
+	   mirror
+	       Out of range pixels will be replaced with mirrored pixels.
+
+	   Default is smear.
+
+       Examples
+
+       o   Add ripple effect to rgb input of video size hd720:
+
+		   ffmpeg -i INPUT -f lavfi -i nullsrc=s=hd720,lutrgb=128:128:128 -f lavfi -i nullsrc=s=hd720,geq='r=128+30*sin(2*PI*X/400+T):g=128+30*sin(2*PI*X/400+T):b=128+30*sin(2*PI*X/400+T)' -lavfi '[0][1][2]displace' OUTPUT
+
+       o   Add wave effect to rgb input of video size hd720:
+
+		   ffmpeg -i INPUT -f lavfi -i nullsrc=hd720,geq='r=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T)):g=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T)):b=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T))' -lavfi '[1]split[x][y],[0][x][y]displace' OUTPUT
+
+   dnn_classify
+       Do classification with deep neural networks based on bounding boxes.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts only openvino now, tensorflow backends will be
+	   added.
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats.
+
+       input
+	   Set the input name of the dnn network.
+
+       output
+	   Set the output name of the dnn network.
+
+       confidence
+	   Set the confidence threshold (default: 0.5).
+
+       labels
+	   Set path to label file specifying the mapping between label id and
+	   name.  Each label name is written in one line, tailing spaces and
+	   empty lines are skipped.  The first line is the name of label id 0,
+	   and the second line is the name of label id 1, etc.	The label id
+	   is considered as name if the label file is not provided.
+
+       backend_configs
+	   Set the configs to be passed into backend
+
+	   For tensorflow backend, you can set its configs with sess_config
+	   options, please use tools/python/tf_sess_config.py to get the
+	   configs for your system.
+
+   dnn_detect
+       Do object detection with deep neural networks.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts only openvino now, tensorflow backends will be
+	   added.
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats.
+
+       input
+	   Set the input name of the dnn network.
+
+       output
+	   Set the output name of the dnn network.
+
+       confidence
+	   Set the confidence threshold (default: 0.5).
+
+       labels
+	   Set path to label file specifying the mapping between label id and
+	   name.  Each label name is written in one line, tailing spaces and
+	   empty lines are skipped.  The first line is the name of label id 0
+	   (usually it is 'background'), and the second line is the name of
+	   label id 1, etc.  The label id is considered as name if the label
+	   file is not provided.
+
+       backend_configs
+	   Set the configs to be passed into backend. To use async execution,
+	   set async (default: set).  Roll back to sync execution if the
+	   backend does not support async.
+
+   dnn_processing
+       Do image processing with deep neural networks. It works together with
+       another filter which converts the pixel format of the Frame to what the
+       dnn network requires.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts the following values:
+
+	   tensorflow
+	       TensorFlow backend. To enable this backend you need to install
+	       the TensorFlow for C library (see
+	       <https://www.tensorflow.org/install/lang_c>) and configure
+	       FFmpeg with "--enable-libtensorflow"
+
+	   openvino
+	       OpenVINO backend. To enable this backend you need to build and
+	       install the OpenVINO for C library (see
+	       <https://github.com/openvinotoolkit/openvino/blob/master/build-instruction.md>)
+	       and configure FFmpeg with "--enable-libopenvino"
+	       (--extra-cflags=-I... --extra-ldflags=-L... might be needed if
+	       the header files and libraries are not installed into system
+	       path)
+
+	   torch
+	       Libtorch backend. To enable this backend you need to build and
+	       install Libtroch for C++ library. Please download cxx11 ABI
+	       version (see <https://pytorch.org/get-started/locally>) and
+	       configure FFmpeg with "--enable-libtorch
+	       --extra-cflags=-I/libtorch_root/libtorch/include
+	       --extra-cflags=-I/libtorch_root/libtorch/include/torch/csrc/api/include
+	       --extra-ldflags=-L/libtorch_root/libtorch/lib/"
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats. TensorFlow, OpenVINO and Libtorch backend can load files
+	   for only its format.
+
+       input
+	   Set the input name of the dnn network.
+
+       output
+	   Set the output name of the dnn network.
+
+       backend_configs
+	   Set the configs to be passed into backend. To use async execution,
+	   set async (default: set).  Roll back to sync execution if the
+	   backend does not support async.
+
+	   For tensorflow backend, you can set its configs with sess_config
+	   options, please use tools/python/tf_sess_config.py to get the
+	   configs of TensorFlow backend for your system.
+
+       Examples
+
+       o   Remove rain in rgb24 frame with can.pb (see derain filter):
+
+		   ./ffmpeg -i rain.jpg -vf format=rgb24,dnn_processing=dnn_backend=tensorflow:model=can.pb:input=x:output=y derain.jpg
+
+       o   Handle the Y channel with srcnn.pb (see sr filter) for frame with
+	   yuv420p (planar YUV formats supported):
+
+		   ./ffmpeg -i 480p.jpg -vf format=yuv420p,scale=w=iw*2:h=ih*2,dnn_processing=dnn_backend=tensorflow:model=srcnn.pb:input=x:output=y -y srcnn.jpg
+
+       o   Handle the Y channel with espcn.pb (see sr filter), which changes
+	   frame size, for format yuv420p (planar YUV formats supported),
+	   please use tools/python/tf_sess_config.py to get the configs of
+	   TensorFlow backend for your system.
+
+		   ./ffmpeg -i 480p.jpg -vf format=yuv420p,dnn_processing=dnn_backend=tensorflow:model=espcn.pb:input=x:output=y:backend_configs=sess_config=0x10022805320e09cdccccccccccec3f20012a01303801 -y tmp.espcn.jpg
+
+   drawbox
+       Draw a colored box on the input image.
+
+       It accepts the following parameters:
+
+       x
+       y   The expressions which specify the top left corner coordinates of
+	   the box. It defaults to 0.
+
+       width, w
+       height, h
+	   The expressions which specify the width and height of the box; if 0
+	   they are interpreted as the input width and height. It defaults to
+	   0.
+
+       color, c
+	   Specify the color of the box to write. For the general syntax of
+	   this option, check the "Color" section in the ffmpeg-utils manual.
+	   If the special value "invert" is used, the box edge color is the
+	   same as the video with inverted luma.
+
+       thickness, t
+	   The expression which sets the thickness of the box edge.  A value
+	   of "fill" will create a filled box. Default value is 3.
+
+	   See below for the list of accepted constants.
+
+       replace
+	   Applicable if the input has alpha. With value 1, the pixels of the
+	   painted box will overwrite the video's color and alpha pixels.
+	   Default is 0, which composites the box onto the input, leaving the
+	   video's alpha intact.
+
+       The parameters for x, y, w and h and t are expressions containing the
+       following constants:
+
+       dar The input display aspect ratio, it is the same as (w / h) * sar.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       in_h, ih
+       in_w, iw
+	   The input width and height.
+
+       sar The input sample aspect ratio.
+
+       x
+       y   The x and y offset coordinates where the box is drawn.
+
+       w
+       h   The width and height of the drawn box.
+
+       box_source
+	   Box source can be set as side_data_detection_bboxes if you want to
+	   use box data in detection bboxes of side data.
+
+	   If box_source is set, the x, y, width and height will be ignored
+	   and still use box data in detection bboxes of side data. So please
+	   do not use this parameter if you were not sure about the box
+	   source.
+
+       t   The thickness of the drawn box.
+
+	   These constants allow the x, y, w, h and t expressions to refer to
+	   each other, so you may for example specify "y=x/dar" or "h=w/dar".
+
+       Examples
+
+       o   Draw a black box around the edge of the input image:
+
+		   drawbox
+
+       o   Draw a box with color red and an opacity of 50%:
+
+		   drawbox=10:20:200:60:red@0.5
+
+	   The previous example can be specified as:
+
+		   drawbox=x=10:y=20:w=200:h=60:color=red@0.5
+
+       o   Fill the box with pink color:
+
+		   drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=fill
+
+       o   Draw a 2-pixel red 2.40:1 mask:
+
+		   drawbox=x=-t:y=0.5*(ih-iw/2.4)-t:w=iw+t*2:h=iw/2.4+t*2:t=2:c=red
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   drawgraph
+       Draw a graph using input video metadata.
+
+       It accepts the following parameters:
+
+       m1  Set 1st frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg1 Set 1st foreground color expression.
+
+       m2  Set 2nd frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg2 Set 2nd foreground color expression.
+
+       m3  Set 3rd frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg3 Set 3rd foreground color expression.
+
+       m4  Set 4th frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg4 Set 4th foreground color expression.
+
+       min Set minimal value of metadata value.
+
+       max Set maximal value of metadata value.
+
+       bg  Set graph background color. Default is white.
+
+       mode
+	   Set graph mode.
+
+	   Available values for mode is:
+
+	   bar
+	   dot
+	   line
+
+	   Default is "line".
+
+       slide
+	   Set slide mode.
+
+	   Available values for slide is:
+
+	   frame
+	       Draw new frame when right border is reached.
+
+	   replace
+	       Replace old columns with new ones.
+
+	   scroll
+	       Scroll from right to left.
+
+	   rscroll
+	       Scroll from left to right.
+
+	   picture
+	       Draw single picture.
+
+	   Default is "frame".
+
+       size
+	   Set size of graph video. For the syntax of this option, check the
+	   "Video size" section in the ffmpeg-utils manual.  The default value
+	   is "900x256".
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+	   The foreground color expressions can use the following variables:
+
+	   MIN Minimal value of metadata value.
+
+	   MAX Maximal value of metadata value.
+
+	   VAL Current metadata key value.
+
+	   The color is defined as 0xAABBGGRR.
+
+       Example using metadata from signalstats filter:
+
+	       signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255
+
+       Example using metadata from ebur128 filter:
+
+	       ebur128=metadata=1,adrawgraph=lavfi.r128.M:min=-120:max=5
+
+   drawgrid
+       Draw a grid on the input image.
+
+       It accepts the following parameters:
+
+       x
+       y   The expressions which specify the coordinates of some point of grid
+	   intersection (meant to configure offset). Both default to 0.
+
+       width, w
+       height, h
+	   The expressions which specify the width and height of the grid
+	   cell, if 0 they are interpreted as the input width and height,
+	   respectively, minus "thickness", so image gets framed. Default to
+	   0.
+
+       color, c
+	   Specify the color of the grid. For the general syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual. If
+	   the special value "invert" is used, the grid color is the same as
+	   the video with inverted luma.
+
+       thickness, t
+	   The expression which sets the thickness of the grid line. Default
+	   value is 1.
+
+	   See below for the list of accepted constants.
+
+       replace
+	   Applicable if the input has alpha. With 1 the pixels of the painted
+	   grid will overwrite the video's color and alpha pixels.  Default is
+	   0, which composites the grid onto the input, leaving the video's
+	   alpha intact.
+
+       The parameters for x, y, w and h and t are expressions containing the
+       following constants:
+
+       dar The input display aspect ratio, it is the same as (w / h) * sar.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       in_h, ih
+       in_w, iw
+	   The input grid cell width and height.
+
+       sar The input sample aspect ratio.
+
+       x
+       y   The x and y coordinates of some point of grid intersection (meant
+	   to configure offset).
+
+       w
+       h   The width and height of the drawn cell.
+
+       t   The thickness of the drawn cell.
+
+	   These constants allow the x, y, w, h and t expressions to refer to
+	   each other, so you may for example specify "y=x/dar" or "h=w/dar".
+
+       Examples
+
+       o   Draw a grid with cell 100x100 pixels, thickness 2 pixels, with
+	   color red and an opacity of 50%:
+
+		   drawgrid=width=100:height=100:thickness=2:color=red@0.5
+
+       o   Draw a white 3x3 grid with an opacity of 50%:
+
+		   drawgrid=w=iw/3:h=ih/3:t=2:c=white@0.5
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   drawtext
+       Draw a text string or text from a specified file on top of a video,
+       using the libfreetype library.
+
+       To enable compilation of this filter, you need to configure FFmpeg with
+       "--enable-libfreetype" and "--enable-libharfbuzz".  To enable default
+       font fallback and the font option you need to configure FFmpeg with
+       "--enable-libfontconfig".  To enable the text_shaping option, you need
+       to configure FFmpeg with "--enable-libfribidi".
+
+       Syntax
+
+       It accepts the following parameters:
+
+       box Used to draw a box around text using the background color.  The
+	   value must be either 1 (enable) or 0 (disable).  The default value
+	   of box is 0.
+
+       boxborderw
+	   Set the width of the border to be drawn around the box using
+	   boxcolor.  The value must be specified using one of the following
+	   formats:
+
+	   *<"boxborderw=10" set the width of all the borders to 10>
+	   *<"boxborderw=10|20" set the width of the top and bottom borders to
+	   10>
+		   and the width of the left and right borders to 20
+
+	   *<"boxborderw=10|20|30" set the width of the top border to 10, the
+	   width>
+		   of the bottom border to 30 and the width of the left and right borders to 20
+
+	   *<"boxborderw=10|20|30|40" set the borders width to 10 (top), 20
+	   (right),>
+		   30 (bottom), 40 (left)
+
+	   The default value of boxborderw is "0".
+
+       boxcolor
+	   The color to be used for drawing box around text. For the syntax of
+	   this option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of boxcolor is "white".
+
+       line_spacing
+	   Set the line spacing in pixels. The default value of line_spacing
+	   is 0.
+
+       text_align
+	   Set the vertical and horizontal alignment of the text with respect
+	   to the box boundaries.  The value is combination of flags, one for
+	   the vertical alignment (T=top, M=middle, B=bottom) and one for the
+	   horizontal alignment (L=left, C=center, R=right).  Please note that
+	   tab characters are only supported with the left horizontal
+	   alignment.
+
+       y_align
+	   Specify what the y value is referred to. Possible values are:
+
+	   *<"text" the top of the highest glyph of the first text line is
+	   placed at y>
+	   *<"baseline" the baseline of the first text line is placed at y>
+	   *<"font" the baseline of the first text line is placed at y plus
+	   the>
+		   ascent (in pixels) defined in the font metrics
+
+	   The default value of y_align is "text" for backward compatibility.
+
+       borderw
+	   Set the width of the border to be drawn around the text using
+	   bordercolor.  The default value of borderw is 0.
+
+       bordercolor
+	   Set the color to be used for drawing border around text. For the
+	   syntax of this option, check the "Color" section in the ffmpeg-
+	   utils manual.
+
+	   The default value of bordercolor is "black".
+
+       expansion
+	   Select how the text is expanded. Can be either "none", "strftime"
+	   (deprecated) or "normal" (default). See the drawtext_expansion,
+	   Text expansion section below for details.
+
+       basetime
+	   Set a start time for the count. Value is in microseconds. Only
+	   applied in the deprecated "strftime" expansion mode. To emulate in
+	   normal expansion mode use the "pts" function, supplying the start
+	   time (in seconds) as the second argument.
+
+       fix_bounds
+	   If true, check and fix text coords to avoid clipping.
+
+       fontcolor
+	   The color to be used for drawing fonts. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of fontcolor is "black".
+
+       fontcolor_expr
+	   String which is expanded the same way as text to obtain dynamic
+	   fontcolor value. By default this option has empty value and is not
+	   processed. When this option is set, it overrides fontcolor option.
+
+       font
+	   The font family to be used for drawing text. By default Sans.
+
+       fontfile
+	   The font file to be used for drawing text. The path must be
+	   included.  This parameter is mandatory if the fontconfig support is
+	   disabled.
+
+       alpha
+	   Draw the text applying alpha blending. The value can be a number
+	   between 0.0 and 1.0.  The expression accepts the same variables x,
+	   y as well.  The default value is 1.	Please see fontcolor_expr.
+
+       fontsize
+	   The font size to be used for drawing text.  The default value of
+	   fontsize is 16.
+
+       text_shaping
+	   If set to 1, attempt to shape the text (for example, reverse the
+	   order of right-to-left text and join Arabic characters) before
+	   drawing it.	Otherwise, just draw the text exactly as given.  By
+	   default 1 (if supported).
+
+       ft_load_flags
+	   The flags to be used for loading the fonts.
+
+	   The flags map the corresponding flags supported by libfreetype, and
+	   are a combination of the following values:
+
+	   default
+	   no_scale
+	   no_hinting
+	   render
+	   no_bitmap
+	   vertical_layout
+	   force_autohint
+	   crop_bitmap
+	   pedantic
+	   ignore_global_advance_width
+	   no_recurse
+	   ignore_transform
+	   monochrome
+	   linear_design
+	   no_autohint
+
+	   Default value is "default".
+
+	   For more information consult the documentation for the FT_LOAD_*
+	   libfreetype flags.
+
+       shadowcolor
+	   The color to be used for drawing a shadow behind the drawn text.
+	   For the syntax of this option, check the "Color" section in the
+	   ffmpeg-utils manual.
+
+	   The default value of shadowcolor is "black".
+
+       boxw
+	   Set the width of the box to be drawn around text.  The default
+	   value of boxw is computed automatically to match the text width
+
+       boxh
+	   Set the height of the box to be drawn around text.  The default
+	   value of boxh is computed automatically to match the text height
+
+       shadowx
+       shadowy
+	   The x and y offsets for the text shadow position with respect to
+	   the position of the text. They can be either positive or negative
+	   values. The default value for both is "0".
+
+       start_number
+	   The starting frame number for the n/frame_num variable. The default
+	   value is "0".
+
+       tabsize
+	   The size in number of spaces to use for rendering the tab.  Default
+	   value is 4.
+
+       timecode
+	   Set the initial timecode representation in "hh:mm:ss[:;.]ff"
+	   format. It can be used with or without text parameter.
+	   timecode_rate option must be specified.
+
+       timecode_rate, rate, r
+	   Set the timecode frame rate (timecode only). Value will be rounded
+	   to nearest integer. Minimum value is "1".  Drop-frame timecode is
+	   supported for frame rates 30 & 60.
+
+       tc24hmax
+	   If set to 1, the output of the timecode option will wrap around at
+	   24 hours.  Default is 0 (disabled).
+
+       text
+	   The text string to be drawn. The text must be a sequence of UTF-8
+	   encoded characters.	This parameter is mandatory if no file is
+	   specified with the parameter textfile.
+
+       textfile
+	   A text file containing text to be drawn. The text must be a
+	   sequence of UTF-8 encoded characters.
+
+	   This parameter is mandatory if no text string is specified with the
+	   parameter text.
+
+	   If both text and textfile are specified, an error is thrown.
+
+       text_source
+	   Text source should be set as side_data_detection_bboxes if you want
+	   to use text data in detection bboxes of side data.
+
+	   If text source is set, text and textfile will be ignored and still
+	   use text data in detection bboxes of side data. So please do not
+	   use this parameter if you are not sure about the text source.
+
+       reload
+	   The textfile will be reloaded at specified frame interval.  Be sure
+	   to update textfile atomically, or it may be read partially, or even
+	   fail.  Range is 0 to INT_MAX. Default is 0.
+
+       x
+       y   The expressions which specify the offsets where text will be drawn
+	   within the video frame. They are relative to the top/left border of
+	   the output image.
+
+	   The default value of x and y is "0".
+
+	   See below for the list of accepted constants and functions.
+
+       The parameters for x and y are expressions containing the following
+       constants and functions:
+
+       dar input display aspect ratio, it is the same as (w / h) * sar
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       line_h, lh
+	   the height of each text line
+
+       main_h, h, H
+	   the input height
+
+       main_w, w, W
+	   the input width
+
+       max_glyph_a, ascent
+	   the maximum distance from the baseline to the highest/upper grid
+	   coordinate used to place a glyph outline point, for all the
+	   rendered glyphs.  It is a positive value, due to the grid's
+	   orientation with the Y axis upwards.
+
+       max_glyph_d, descent
+	   the maximum distance from the baseline to the lowest grid
+	   coordinate used to place a glyph outline point, for all the
+	   rendered glyphs.  This is a negative value, due to the grid's
+	   orientation, with the Y axis upwards.
+
+       max_glyph_h
+	   maximum glyph height, that is the maximum height for all the glyphs
+	   contained in the rendered text, it is equivalent to ascent -
+	   descent.
+
+       max_glyph_w
+	   maximum glyph width, that is the maximum width for all the glyphs
+	   contained in the rendered text
+
+       font_a
+	   the ascent size defined in the font metrics
+
+       font_d
+	   the descent size defined in the font metrics
+
+       top_a
+	   the maximum ascender of the glyphs of the first text line
+
+       bottom_d
+	   the maximum descender of the glyphs of the last text line
+
+       n   the number of input frame, starting from 0
+
+       rand(min, max)
+	   return a random number included between min and max
+
+       sar The input sample aspect ratio.
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       text_h, th
+	   the height of the rendered text
+
+       text_w, tw
+	   the width of the rendered text
+
+       x
+       y   the x and y offset coordinates where the text is drawn.
+
+	   These parameters allow the x and y expressions to refer to each
+	   other, so you can for example specify "y=x/dar".
+
+       pict_type
+	   A one character description of the current frame's picture type.
+
+       pkt_pos
+	   The current packet's position in the input file or stream (in
+	   bytes, from the start of the input). A value of -1 indicates this
+	   info is not available.
+
+       duration
+	   The current packet's duration, in seconds.
+
+       pkt_size
+	   The current packet's size (in bytes).
+
+       Text expansion
+
+       If expansion is set to "strftime", the filter recognizes sequences
+       accepted by the "strftime" C function in the provided text and expands
+       them accordingly. Check the documentation of "strftime". This feature
+       is deprecated in favor of "normal" expansion with the "gmtime" or
+       "localtime" expansion functions.
+
+       If expansion is set to "none", the text is printed verbatim.
+
+       If expansion is set to "normal" (which is the default), the following
+       expansion mechanism is used.
+
+       The backslash character \, followed by any character, always expands to
+       the second character.
+
+       Sequences of the form "%{...}" are expanded. The text between the
+       braces is a function name, possibly followed by arguments separated by
+       ':'.  If the arguments contain special characters or delimiters (':' or
+       '}'), they should be escaped.
+
+       Note that they probably must also be escaped as the value for the text
+       option in the filter argument string and as the filter argument in the
+       filtergraph description, and possibly also for the shell, that makes up
+       to four levels of escaping; using a text file with the textfile option
+       avoids these problems.
+
+       The following functions are available:
+
+       expr, e
+	   The expression evaluation result.
+
+	   It must take one argument specifying the expression to be
+	   evaluated, which accepts the same constants and functions as the x
+	   and y values. Note that not all constants should be used, for
+	   example the text size is not known when evaluating the expression,
+	   so the constants text_w and text_h will have an undefined value.
+
+       expr_int_format, eif
+	   Evaluate the expression's value and output as formatted integer.
+
+	   The first argument is the expression to be evaluated, just as for
+	   the expr function.  The second argument specifies the output
+	   format. Allowed values are x, X, d and u. They are treated exactly
+	   as in the "printf" function.  The third parameter is optional and
+	   sets the number of positions taken by the output.  It can be used
+	   to add padding with zeros from the left.
+
+       gmtime
+	   The time at which the filter is running, expressed in UTC.  It can
+	   accept an argument: a "strftime" C function format string.  The
+	   format string is extended to support the variable %[1-6]N which
+	   prints fractions of the second with optionally specified number of
+	   digits.
+
+       localtime
+	   The time at which the filter is running, expressed in the local
+	   time zone.  It can accept an argument: a "strftime" C function
+	   format string.  The format string is extended to support the
+	   variable %[1-6]N which prints fractions of the second with
+	   optionally specified number of digits.
+
+       metadata
+	   Frame metadata. Takes one or two arguments.
+
+	   The first argument is mandatory and specifies the metadata key.
+
+	   The second argument is optional and specifies a default value, used
+	   when the metadata key is not found or empty.
+
+	   Available metadata can be identified by inspecting entries starting
+	   with TAG included within each frame section printed by running
+	   "ffprobe -show_frames".
+
+	   String metadata generated in filters leading to the drawtext filter
+	   are also available.
+
+       n, frame_num
+	   The frame number, starting from 0.
+
+       pict_type
+	   A one character description of the current picture type.
+
+       pts The timestamp of the current frame.	It can take up to three
+	   arguments.
+
+	   The first argument is the format of the timestamp; it defaults to
+	   "flt" for seconds as a decimal number with microsecond accuracy;
+	   "hms" stands for a formatted [-]HH:MM:SS.mmm timestamp with
+	   millisecond accuracy.  "gmtime" stands for the timestamp of the
+	   frame formatted as UTC time; "localtime" stands for the timestamp
+	   of the frame formatted as local time zone time.
+
+	   The second argument is an offset added to the timestamp.
+
+	   If the format is set to "hms", a third argument "24HH" may be
+	   supplied to present the hour part of the formatted timestamp in 24h
+	   format (00-23).
+
+	   If the format is set to "localtime" or "gmtime", a third argument
+	   may be supplied: a "strftime" C function format string.  By
+	   default, YYYY-MM-DD HH:MM:SS format will be used.
+
+       Commands
+
+       This filter supports altering parameters via commands:
+
+       reinit
+	   Alter existing filter parameters.
+
+	   Syntax for the argument is the same as for filter invocation, e.g.
+
+		   fontsize=56:fontcolor=green:text='Hello World'
+
+	   Full filter invocation with sendcmd would look like this:
+
+		   sendcmd=c='56.0 drawtext reinit fontsize=56\:fontcolor=green\:text=Hello\\ World'
+
+	   If the entire argument can't be parsed or applied as valid values
+	   then the filter will continue with its existing parameters.
+
+       The following options are also supported as commands:
+
+       *<x>
+       *<y>
+       *<alpha>
+       *<fontsize>
+       *<fontcolor>
+       *<boxcolor>
+       *<bordercolor>
+       *<shadowcolor>
+       *<box>
+       *<boxw>
+       *<boxh>
+       *<boxborderw>
+       *<line_spacing>
+       *<text_align>
+       *<shadowx>
+       *<shadowy>
+       *<borderw>
+
+       Examples
+
+       o   Draw "Test Text" with font FreeSerif, using the default values for
+	   the optional parameters.
+
+		   drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text'"
+
+       o   Draw 'Test Text' with font FreeSerif of size 24 at position x=100
+	   and y=50 (counting from the top-left corner of the screen), text is
+	   yellow with a red box around it. Both the text and the box have an
+	   opacity of 20%.
+
+		   drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text':\
+			     x=100: y=50: fontsize=24: fontcolor=yellow@0.2: box=1: boxcolor=red@0.2"
+
+	   Note that the double quotes are not necessary if spaces are not
+	   used within the parameter list.
+
+       o   Show the text at the center of the video frame:
+
+		   drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=(w-text_w)/2:y=(h-text_h)/2"
+
+       o   Show the text at a random position, switching to a new position
+	   every 30 seconds:
+
+		   drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=if(eq(mod(t\,30)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(t\,30)\,0)\,rand(0\,(h-text_h))\,y)"
+
+       o   Show a text line sliding from right to left in the last row of the
+	   video frame. The file LONG_LINE is assumed to contain a single line
+	   with no newlines.
+
+		   drawtext="fontsize=15:fontfile=FreeSerif.ttf:text=LONG_LINE:y=h-line_h:x=-50*t"
+
+       o   Show the content of file CREDITS off the bottom of the frame and
+	   scroll up.
+
+		   drawtext="fontsize=20:fontfile=FreeSerif.ttf:textfile=CREDITS:y=h-20*t"
+
+       o   Draw a single green letter "g", at the center of the input video.
+	   The glyph baseline is placed at half screen height.
+
+		   drawtext="fontsize=60:fontfile=FreeSerif.ttf:fontcolor=green:text=g:x=(w-max_glyph_w)/2:y=h/2-ascent"
+
+       o   Show text for 1 second every 3 seconds:
+
+		   drawtext="fontfile=FreeSerif.ttf:fontcolor=white:x=100:y=x/dar:enable=lt(mod(t\,3)\,1):text='blink'"
+
+       o   Use fontconfig to set the font. Note that the colons need to be
+	   escaped.
+
+		   drawtext='fontfile=Linux Libertine O-40\\:style=Semibold:text=FFmpeg'
+
+       o   Draw "Test Text" with font size dependent on height of the video.
+
+		   drawtext="text='Test Text': fontsize=h/30: x=(w-text_w)/2: y=(h-text_h*2)"
+
+       o   Print the date of a real-time encoding (see documentation for the
+	   "strftime" C function):
+
+		   drawtext='fontfile=FreeSans.ttf:text=%{localtime\:%a %b %d %Y}'
+
+       o   Show text fading in and out (appearing/disappearing):
+
+		   #!/bin/sh
+		   DS=1.0 # display start
+		   DE=10.0 # display end
+		   FID=1.5 # fade in duration
+		   FOD=5 # fade out duration
+		   ffplay -f lavfi "color,drawtext=text=TEST:fontsize=50:fontfile=FreeSerif.ttf:fontcolor_expr=ff0000%{eif\\\\: clip(255*(1*between(t\\, $DS + $FID\\, $DE - $FOD) + ((t - $DS)/$FID)*between(t\\, $DS\\, $DS + $FID) + (-(t - $DE)/$FOD)*between(t\\, $DE - $FOD\\, $DE) )\\, 0\\, 255) \\\\: x\\\\: 2 }"
+
+       o   Horizontally align multiple separate texts. Note that max_glyph_a
+	   and the fontsize value are included in the y offset.
+
+		   drawtext=fontfile=FreeSans.ttf:text=DOG:fontsize=24:x=10:y=20+24-max_glyph_a,
+		   drawtext=fontfile=FreeSans.ttf:text=cow:fontsize=24:x=80:y=20+24-max_glyph_a
+
+       o   Plot special lavf.image2dec.source_basename metadata onto each
+	   frame if such metadata exists. Otherwise, plot the string "NA".
+	   Note that image2 demuxer must have option -export_path_metadata 1
+	   for the special metadata fields to be available for filters.
+
+		   drawtext="fontsize=20:fontcolor=white:fontfile=FreeSans.ttf:text='%{metadata\:lavf.image2dec.source_basename\:NA}':x=10:y=10"
+
+       For more information about libfreetype, check:
+       <http://www.freetype.org/>.
+
+       For more information about fontconfig, check:
+       <http://freedesktop.org/software/fontconfig/fontconfig-user.html>.
+
+       For more information about libfribidi, check: <http://fribidi.org/>.
+
+       For more information about libharfbuzz, check:
+       <https://github.com/harfbuzz/harfbuzz>.
+
+   edgedetect
+       Detect and draw edges. The filter uses the Canny Edge Detection
+       algorithm.
+
+       The filter accepts the following options:
+
+       low
+       high
+	   Set low and high threshold values used by the Canny thresholding
+	   algorithm.
+
+	   The high threshold selects the "strong" edge pixels, which are then
+	   connected through 8-connectivity with the "weak" edge pixels
+	   selected by the low threshold.
+
+	   low and high threshold values must be chosen in the range [0,1],
+	   and low should be lesser or equal to high.
+
+	   Default value for low is "20/255", and default value for high is
+	   "50/255".
+
+       mode
+	   Define the drawing mode.
+
+	   wires
+	       Draw white/gray wires on black background.
+
+	   colormix
+	       Mix the colors to create a paint/cartoon effect.
+
+	   canny
+	       Apply Canny edge detector on all selected planes.
+
+	   Default value is wires.
+
+       planes
+	   Select planes for filtering. By default all available planes are
+	   filtered.
+
+       Examples
+
+       o   Standard edge detection with custom values for the hysteresis
+	   thresholding:
+
+		   edgedetect=low=0.1:high=0.4
+
+       o   Painting effect without thresholding:
+
+		   edgedetect=mode=colormix:high=0
+
+   elbg
+       Apply a posterize effect using the ELBG (Enhanced LBG) algorithm.
+
+       For each input image, the filter will compute the optimal mapping from
+       the input to the output given the codebook length, that is the number
+       of distinct output colors.
+
+       This filter accepts the following options.
+
+       codebook_length, l
+	   Set codebook length. The value must be a positive integer, and
+	   represents the number of distinct output colors. Default value is
+	   256.
+
+       nb_steps, n
+	   Set the maximum number of iterations to apply for computing the
+	   optimal mapping. The higher the value the better the result and the
+	   higher the computation time. Default value is 1.
+
+       seed, s
+	   Set a random seed, must be an integer included between 0 and
+	   UINT32_MAX. If not specified, or if explicitly set to -1, the
+	   filter will try to use a good random seed on a best effort basis.
+
+       pal8
+	   Set pal8 output pixel format. This option does not work with
+	   codebook length greater than 256. Default is disabled.
+
+       use_alpha
+	   Include alpha values in the quantization calculation. Allows
+	   creating palettized output images (e.g. PNG8) with multiple alpha
+	   smooth blending.
+
+   entropy
+       Measure graylevel entropy in histogram of color channels of video
+       frames.
+
+       It accepts the following parameters:
+
+       mode
+	   Can be either normal or diff. Default is normal.
+
+	   diff mode measures entropy of histogram delta values, absolute
+	   differences between neighbour histogram values.
+
+   epx
+       Apply the EPX magnification filter which is designed for pixel art.
+
+       It accepts the following option:
+
+       n   Set the scaling dimension: 2 for "2xEPX", 3 for "3xEPX".  Default
+	   is 3.
+
+   eq
+       Set brightness, contrast, saturation and approximate gamma adjustment.
+
+       The filter accepts the following options:
+
+       contrast
+	   Set the contrast expression. The value must be a float value in
+	   range "-1000.0" to 1000.0. The default value is "1".
+
+       brightness
+	   Set the brightness expression. The value must be a float value in
+	   range "-1.0" to 1.0. The default value is "0".
+
+       saturation
+	   Set the saturation expression. The value must be a float in range
+	   0.0 to 3.0. The default value is "1".
+
+       gamma
+	   Set the gamma expression. The value must be a float in range 0.1 to
+	   10.0.  The default value is "1".
+
+       gamma_r
+	   Set the gamma expression for red. The value must be a float in
+	   range 0.1 to 10.0. The default value is "1".
+
+       gamma_g
+	   Set the gamma expression for green. The value must be a float in
+	   range 0.1 to 10.0. The default value is "1".
+
+       gamma_b
+	   Set the gamma expression for blue. The value must be a float in
+	   range 0.1 to 10.0. The default value is "1".
+
+       gamma_weight
+	   Set the gamma weight expression. It can be used to reduce the
+	   effect of a high gamma value on bright image areas, e.g. keep them
+	   from getting overamplified and just plain white. The value must be
+	   a float in range 0.0 to 1.0. A value of 0.0 turns the gamma
+	   correction all the way down while 1.0 leaves it at its full
+	   strength. Default is "1".
+
+       eval
+	   Set when the expressions for brightness, contrast, saturation and
+	   gamma expressions are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       only evaluate expressions once during the filter initialization
+	       or when a command is processed
+
+	   frame
+	       evaluate expressions for each incoming frame
+
+	   Default value is init.
+
+       The expressions accept the following parameters:
+
+       n   frame count of the input frame starting from 0
+
+       pos byte position of the corresponding packet in the input file, NAN if
+	   unspecified; deprecated, do not use
+
+       r   frame rate of the input video, NAN if the input frame rate is
+	   unknown
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       Commands
+
+       The filter supports the following commands:
+
+       contrast
+	   Set the contrast expression.
+
+       brightness
+	   Set the brightness expression.
+
+       saturation
+	   Set the saturation expression.
+
+       gamma
+	   Set the gamma expression.
+
+       gamma_r
+	   Set the gamma_r expression.
+
+       gamma_g
+	   Set gamma_g expression.
+
+       gamma_b
+	   Set gamma_b expression.
+
+       gamma_weight
+	   Set gamma_weight expression.
+
+	   The command accepts the same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   erosion
+       Apply erosion effect to the video.
+
+       This filter replaces the pixel by the local(3x3) minimum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to. Default is 255 i.e. all
+	   eight pixels are used.
+
+	   Flags to local 3x3 coordinates maps like this:
+
+	       1 2 3
+	       4   5
+	       6 7 8
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   estdif
+       Deinterlace the input video ("estdif" stands for "Edge Slope Tracing
+       Deinterlacing Filter").
+
+       Spatial only filter that uses edge slope tracing algorithm to
+       interpolate missing lines.  It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   frame
+	       Output one frame for each frame.
+
+	   field
+	       Output one frame for each field.
+
+	   The default value is "field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   tff Assume the top field is first.
+
+	   bff Assume the bottom field is first.
+
+	   auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   all Deinterlace all frames.
+
+	   interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+       rslope
+	   Specify the search radius for edge slope tracing. Default value is
+	   1.  Allowed range is from 1 to 15.
+
+       redge
+	   Specify the search radius for best edge matching. Default value is
+	   2.  Allowed range is from 0 to 15.
+
+       ecost
+	   Specify the edge cost for edge matching. Default value is 2.
+	   Allowed range is from 0 to 50.
+
+       mcost
+	   Specify the middle cost for edge matching. Default value is 1.
+	   Allowed range is from 0 to 50.
+
+       dcost
+	   Specify the distance cost for edge matching. Default value is 1.
+	   Allowed range is from 0 to 50.
+
+       interp
+	   Specify the interpolation used. Default is 4-point interpolation.
+	   It accepts one of the following values:
+
+	   2p  Two-point interpolation.
+
+	   4p  Four-point interpolation.
+
+	   6p  Six-point interpolation.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   exposure
+       Adjust exposure of the video stream.
+
+       The filter accepts the following options:
+
+       exposure
+	   Set the exposure correction in EV. Allowed range is from -3.0 to
+	   3.0 EV Default value is 0 EV.
+
+       black
+	   Set the black level correction. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   extractplanes
+       Extract color channel components from input video stream into separate
+       grayscale video streams.
+
+       The filter accepts the following option:
+
+       planes
+	   Set plane(s) to extract.
+
+	   Available values for planes are:
+
+	   y
+	   u
+	   v
+	   a
+	   r
+	   g
+	   b
+
+	   Choosing planes not available in the input will result in an error.
+	   That means you cannot select "r", "g", "b" planes with "y", "u",
+	   "v" planes at same time.
+
+       Examples
+
+       o   Extract luma, u and v color channel component from input video
+	   frame into 3 grayscale outputs:
+
+		   ffmpeg -i video.avi -filter_complex 'extractplanes=y+u+v[y][u][v]' -map '[y]' y.avi -map '[u]' u.avi -map '[v]' v.avi
+
+   fade
+       Apply a fade-in/out effect to the input video.
+
+       It accepts the following parameters:
+
+       type, t
+	   The effect type can be either "in" for a fade-in, or "out" for a
+	   fade-out effect.  Default is "in".
+
+       start_frame, s
+	   Specify the number of the frame to start applying the fade effect
+	   at. Default is 0.
+
+       nb_frames, n
+	   The number of frames that the fade effect lasts. At the end of the
+	   fade-in effect, the output video will have the same intensity as
+	   the input video.  At the end of the fade-out transition, the output
+	   video will be filled with the selected color.  Default is 25.
+
+       alpha
+	   If set to 1, fade only alpha channel, if one exists on the input.
+	   Default value is 0.
+
+       start_time, st
+	   Specify the timestamp (in seconds) of the frame to start to apply
+	   the fade effect. If both start_frame and start_time are specified,
+	   the fade will start at whichever comes last.  Default is 0.
+
+       duration, d
+	   The number of seconds for which the fade effect has to last. At the
+	   end of the fade-in effect the output video will have the same
+	   intensity as the input video, at the end of the fade-out transition
+	   the output video will be filled with the selected color.  If both
+	   duration and nb_frames are specified, duration is used. Default is
+	   0 (nb_frames is used by default).
+
+       color, c
+	   Specify the color of the fade. Default is "black".
+
+       Examples
+
+       o   Fade in the first 30 frames of video:
+
+		   fade=in:0:30
+
+	   The command above is equivalent to:
+
+		   fade=t=in:s=0:n=30
+
+       o   Fade out the last 45 frames of a 200-frame video:
+
+		   fade=out:155:45
+		   fade=type=out:start_frame=155:nb_frames=45
+
+       o   Fade in the first 25 frames and fade out the last 25 frames of a
+	   1000-frame video:
+
+		   fade=in:0:25, fade=out:975:25
+
+       o   Make the first 5 frames yellow, then fade in from frame 5-24:
+
+		   fade=in:5:20:color=yellow
+
+       o   Fade in alpha over first 25 frames of video:
+
+		   fade=in:0:25:alpha=1
+
+       o   Make the first 5.5 seconds black, then fade in for 0.5 seconds:
+
+		   fade=t=in:st=5.5:d=0.5
+
+   feedback
+       Apply feedback video filter.
+
+       This filter pass cropped input frames to 2nd output.  From there it can
+       be filtered with other video filters.  After filter receives frame from
+       2nd input, that frame is combined on top of original frame from 1st
+       input and passed to 1st output.
+
+       The typical usage is filter only part of frame.
+
+       The filter accepts the following options:
+
+       x
+       y   Set the top left crop position.
+
+       w
+       h   Set the crop size.
+
+       Examples
+
+       o   Blur only top left rectangular part of video frame size 100x100
+	   with gblur filter.
+
+		   [in][blurin]feedback=x=0:y=0:w=100:h=100[out][blurout];[blurout]gblur=8[blurin]
+
+       o   Draw black box on top left part of video frame of size 100x100 with
+	   drawbox filter.
+
+		   [in][blurin]feedback=x=0:y=0:w=100:h=100[out][blurout];[blurout]drawbox=x=0:y=0:w=100:h=100:t=100[blurin]
+
+       o   Pixelize rectangular part of video frame of size 100x100 with
+	   pixelize filter.
+
+		   [in][blurin]feedback=x=320:y=240:w=100:h=100[out][blurout];[blurout]pixelize[blurin]
+
+   fftdnoiz
+       Denoise frames using 3D FFT (frequency domain filtering).
+
+       The filter accepts the following options:
+
+       sigma
+	   Set the noise sigma constant. This sets denoising strength.
+	   Default value is 1. Allowed range is from 0 to 30.  Using very high
+	   sigma with low overlap may give blocking artifacts.
+
+       amount
+	   Set amount of denoising. By default all detected noise is reduced.
+	   Default value is 1. Allowed range is from 0 to 1.
+
+       block
+	   Set size of block in pixels, Default is 32, can be 8 to 256.
+
+       overlap
+	   Set block overlap. Default is 0.5. Allowed range is from 0.2 to
+	   0.8.
+
+       method
+	   Set denoising method. Default is "wiener", can also be "hard".
+
+       prev
+	   Set number of previous frames to use for denoising. By default is
+	   set to 0.
+
+       next
+	   Set number of next frames to to use for denoising. By default is
+	   set to 0.
+
+       planes
+	   Set planes which will be filtered, by default are all available
+	   filtered except alpha.
+
+   fftfilt
+       Apply arbitrary expressions to samples in frequency domain
+
+       dc_Y
+	   Adjust the dc value (gain) of the luma plane of the image. The
+	   filter accepts an integer value in range 0 to 1000. The default
+	   value is set to 0.
+
+       dc_U
+	   Adjust the dc value (gain) of the 1st chroma plane of the image.
+	   The filter accepts an integer value in range 0 to 1000. The default
+	   value is set to 0.
+
+       dc_V
+	   Adjust the dc value (gain) of the 2nd chroma plane of the image.
+	   The filter accepts an integer value in range 0 to 1000. The default
+	   value is set to 0.
+
+       weight_Y
+	   Set the frequency domain weight expression for the luma plane.
+
+       weight_U
+	   Set the frequency domain weight expression for the 1st chroma
+	   plane.
+
+       weight_V
+	   Set the frequency domain weight expression for the 2nd chroma
+	   plane.
+
+       eval
+	   Set when the expressions are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       Only evaluate expressions once during the filter
+	       initialization.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+	   Default value is init.
+
+	   The filter accepts the following variables:
+
+       X
+       Y   The coordinates of the current sample.
+
+       W
+       H   The width and height of the image.
+
+       N   The number of input frame, starting from 0.
+
+       WS
+       HS  The size of FFT array for horizontal and vertical processing.
+
+       Examples
+
+       o   High-pass:
+
+		   fftfilt=dc_Y=128:weight_Y='squish(1-(Y+X)/100)'
+
+       o   Low-pass:
+
+		   fftfilt=dc_Y=0:weight_Y='squish((Y+X)/100-1)'
+
+       o   Sharpen:
+
+		   fftfilt=dc_Y=0:weight_Y='1+squish(1-(Y+X)/100)'
+
+       o   Blur:
+
+		   fftfilt=dc_Y=0:weight_Y='exp(-4 * ((Y+X)/(W+H)))'
+
+   field
+       Extract a single field from an interlaced image using stride arithmetic
+       to avoid wasting CPU time. The output frames are marked as non-
+       interlaced.
+
+       The filter accepts the following options:
+
+       type
+	   Specify whether to extract the top (if the value is 0 or "top") or
+	   the bottom field (if the value is 1 or "bottom").
+
+   fieldhint
+       Create new frames by copying the top and bottom fields from surrounding
+       frames supplied as numbers by the hint file.
+
+       hint
+	   Set file containing hints: absolute/relative frame numbers.
+
+	   There must be one line for each frame in a clip. Each line must
+	   contain two numbers separated by the comma, optionally followed by
+	   "-" or "+".	Numbers supplied on each line of file can not be out
+	   of [N-1,N+1] where N is current frame number for "absolute" mode or
+	   out of [-1, 1] range for "relative" mode. First number tells from
+	   which frame to pick up top field and second number tells from which
+	   frame to pick up bottom field.
+
+	   If optionally followed by "+" output frame will be marked as
+	   interlaced, else if followed by "-" output frame will be marked as
+	   progressive, else it will be marked same as input frame.  If
+	   optionally followed by "t" output frame will use only top field, or
+	   in case of "b" it will use only bottom field.  If line starts with
+	   "#" or ";" that line is skipped.
+
+       mode
+	   Can be item "absolute" or "relative" or "pattern". Default is
+	   "absolute".	The "pattern" mode is same as "relative" mode, except
+	   at last entry of file if there are more frames to process than
+	   "hint" file is seek back to start.
+
+       Example of first several lines of "hint" file for "relative" mode:
+
+	       0,0 - # first frame
+	       1,0 - # second frame, use third's frame top field and second's frame bottom field
+	       1,0 - # third frame, use fourth's frame top field and third's frame bottom field
+	       1,0 -
+	       0,0 -
+	       0,0 -
+	       1,0 -
+	       1,0 -
+	       1,0 -
+	       0,0 -
+	       0,0 -
+	       1,0 -
+	       1,0 -
+	       1,0 -
+	       0,0 -
+
+   fieldmatch
+       Field matching filter for inverse telecine. It is meant to reconstruct
+       the progressive frames from a telecined stream. The filter does not
+       drop duplicated frames, so to achieve a complete inverse telecine
+       "fieldmatch" needs to be followed by a decimation filter such as
+       decimate in the filtergraph.
+
+       The separation of the field matching and the decimation is notably
+       motivated by the possibility of inserting a de-interlacing filter
+       fallback between the two.  If the source has mixed telecined and real
+       interlaced content, "fieldmatch" will not be able to match fields for
+       the interlaced parts.  But these remaining combed frames will be marked
+       as interlaced, and thus can be de-interlaced by a later filter such as
+       yadif before decimation.
+
+       In addition to the various configuration options, "fieldmatch" can take
+       an optional second stream, activated through the ppsrc option. If
+       enabled, the frames reconstruction will be based on the fields and
+       frames from this second stream. This allows the first input to be pre-
+       processed in order to help the various algorithms of the filter, while
+       keeping the output lossless (assuming the fields are matched properly).
+       Typically, a field-aware denoiser, or brightness/contrast adjustments
+       can help.
+
+       Note that this filter uses the same algorithms as TIVTC/TFM (AviSynth
+       project) and VIVTC/VFM (VapourSynth project). The later is a light
+       clone of TFM from which "fieldmatch" is based on. While the semantic
+       and usage are very close, some behaviour and options names can differ.
+
+       The decimate filter currently only works for constant frame rate input.
+       If your input has mixed telecined (30fps) and progressive content with
+       a lower framerate like 24fps use the following filterchain to produce
+       the necessary cfr stream:
+       "dejudder,fps=30000/1001,fieldmatch,decimate".
+
+       The filter accepts the following options:
+
+       order
+	   Specify the assumed field order of the input stream. Available
+	   values are:
+
+	   auto
+	       Auto detect parity (use FFmpeg's internal parity value).
+
+	   bff Assume bottom field first.
+
+	   tff Assume top field first.
+
+	   Note that it is sometimes recommended not to trust the parity
+	   announced by the stream.
+
+	   Default value is auto.
+
+       mode
+	   Set the matching mode or strategy to use. pc mode is the safest in
+	   the sense that it won't risk creating jerkiness due to duplicate
+	   frames when possible, but if there are bad edits or blended fields
+	   it will end up outputting combed frames when a good match might
+	   actually exist. On the other hand, pcn_ub mode is the most risky in
+	   terms of creating jerkiness, but will almost always find a good
+	   frame if there is one. The other values are all somewhere in
+	   between pc and pcn_ub in terms of risking jerkiness and creating
+	   duplicate frames versus finding good matches in sections with bad
+	   edits, orphaned fields, blended fields, etc.
+
+	   More details about p/c/n/u/b are available in p/c/n/u/b meaning
+	   section.
+
+	   Available values are:
+
+	   pc  2-way matching (p/c)
+
+	   pc_n
+	       2-way matching, and trying 3rd match if still combed (p/c + n)
+
+	   pc_u
+	       2-way matching, and trying 3rd match (same order) if still
+	       combed (p/c + u)
+
+	   pc_n_ub
+	       2-way matching, trying 3rd match if still combed, and trying
+	       4th/5th matches if still combed (p/c + n + u/b)
+
+	   pcn 3-way matching (p/c/n)
+
+	   pcn_ub
+	       3-way matching, and trying 4th/5th matches if all 3 of the
+	       original matches are detected as combed (p/c/n + u/b)
+
+	   The parenthesis at the end indicate the matches that would be used
+	   for that mode assuming order=tff (and field on auto or top).
+
+	   In terms of speed pc mode is by far the fastest and pcn_ub is the
+	   slowest.
+
+	   Default value is pc_n.
+
+       ppsrc
+	   Mark the main input stream as a pre-processed input, and enable the
+	   secondary input stream as the clean source to pick the fields from.
+	   See the filter introduction for more details. It is similar to the
+	   clip2 feature from VFM/TFM.
+
+	   Default value is 0 (disabled).
+
+       field
+	   Set the field to match from. It is recommended to set this to the
+	   same value as order unless you experience matching failures with
+	   that setting. In certain circumstances changing the field that is
+	   used to match from can have a large impact on matching performance.
+	   Available values are:
+
+	   auto
+	       Automatic (same value as order).
+
+	   bottom
+	       Match from the bottom field.
+
+	   top Match from the top field.
+
+	   Default value is auto.
+
+       mchroma
+	   Set whether or not chroma is included during the match comparisons.
+	   In most cases it is recommended to leave this enabled. You should
+	   set this to 0 only if your clip has bad chroma problems such as
+	   heavy rainbowing or other artifacts. Setting this to 0 could also
+	   be used to speed things up at the cost of some accuracy.
+
+	   Default value is 1.
+
+       y0
+       y1  These define an exclusion band which excludes the lines between y0
+	   and y1 from being included in the field matching decision. An
+	   exclusion band can be used to ignore subtitles, a logo, or other
+	   things that may interfere with the matching. y0 sets the starting
+	   scan line and y1 sets the ending line; all lines in between y0 and
+	   y1 (including y0 and y1) will be ignored. Setting y0 and y1 to the
+	   same value will disable the feature.  y0 and y1 defaults to 0.
+
+       scthresh
+	   Set the scene change detection threshold as a percentage of maximum
+	   change on the luma plane. Good values are in the "[8.0, 14.0]"
+	   range. Scene change detection is only relevant in case
+	   combmatch=sc.  The range for scthresh is "[0.0, 100.0]".
+
+	   Default value is 12.0.
+
+       combmatch
+	   When combatch is not none, "fieldmatch" will take into account the
+	   combed scores of matches when deciding what match to use as the
+	   final match. Available values are:
+
+	   none
+	       No final matching based on combed scores.
+
+	   sc  Combed scores are only used when a scene change is detected.
+
+	   full
+	       Use combed scores all the time.
+
+	   Default is sc.
+
+       combdbg
+	   Force "fieldmatch" to calculate the combed metrics for certain
+	   matches and print them. This setting is known as micout in TFM/VFM
+	   vocabulary.	Available values are:
+
+	   none
+	       No forced calculation.
+
+	   pcn Force p/c/n calculations.
+
+	   pcnub
+	       Force p/c/n/u/b calculations.
+
+	   Default value is none.
+
+       cthresh
+	   This is the area combing threshold used for combed frame detection.
+	   This essentially controls how "strong" or "visible" combing must be
+	   to be detected.  Larger values mean combing must be more visible
+	   and smaller values mean combing can be less visible or strong and
+	   still be detected. Valid settings are from "-1" (every pixel will
+	   be detected as combed) to 255 (no pixel will be detected as
+	   combed). This is basically a pixel difference value. A good range
+	   is "[8, 12]".
+
+	   Default value is 9.
+
+       chroma
+	   Sets whether or not chroma is considered in the combed frame
+	   decision.  Only disable this if your source has chroma problems
+	   (rainbowing, etc.) that are causing problems for the combed frame
+	   detection with chroma enabled. Actually, using chroma=0 is usually
+	   more reliable, except for the case where there is chroma only
+	   combing in the source.
+
+	   Default value is 0.
+
+       blockx
+       blocky
+	   Respectively set the x-axis and y-axis size of the window used
+	   during combed frame detection. This has to do with the size of the
+	   area in which combpel pixels are required to be detected as combed
+	   for a frame to be declared combed. See the combpel parameter
+	   description for more info.  Possible values are any number that is
+	   a power of 2 starting at 4 and going up to 512.
+
+	   Default value is 16.
+
+       combpel
+	   The number of combed pixels inside any of the blocky by blockx size
+	   blocks on the frame for the frame to be detected as combed. While
+	   cthresh controls how "visible" the combing must be, this setting
+	   controls "how much" combing there must be in any localized area (a
+	   window defined by the blockx and blocky settings) on the frame.
+	   Minimum value is 0 and maximum is "blocky x blockx" (at which point
+	   no frames will ever be detected as combed). This setting is known
+	   as MI in TFM/VFM vocabulary.
+
+	   Default value is 80.
+
+       p/c/n/u/b meaning
+
+       p/c/n
+
+       We assume the following telecined stream:
+
+	       Top fields:     1 2 2 3 4
+	       Bottom fields:  1 2 3 4 4
+
+       The numbers correspond to the progressive frame the fields relate to.
+       Here, the first two frames are progressive, the 3rd and 4th are combed,
+       and so on.
+
+       When "fieldmatch" is configured to run a matching from bottom
+       (field=bottom) this is how this input stream get transformed:
+
+	       Input stream:
+			       T     1 2 2 3 4
+			       B     1 2 3 4 4	 <-- matching reference
+
+	       Matches: 	     c c n n c
+
+	       Output stream:
+			       T     1 2 3 4 4
+			       B     1 2 3 4 4
+
+       As a result of the field matching, we can see that some frames get
+       duplicated.  To perform a complete inverse telecine, you need to rely
+       on a decimation filter after this operation. See for instance the
+       decimate filter.
+
+       The same operation now matching from top fields (field=top) looks like
+       this:
+
+	       Input stream:
+			       T     1 2 2 3 4	 <-- matching reference
+			       B     1 2 3 4 4
+
+	       Matches: 	     c c p p c
+
+	       Output stream:
+			       T     1 2 2 3 4
+			       B     1 2 2 3 4
+
+       In these examples, we can see what p, c and n mean; basically, they
+       refer to the frame and field of the opposite parity:
+
+       *<p matches the field of the opposite parity in the previous frame>
+       *<c matches the field of the opposite parity in the current frame>
+       *<n matches the field of the opposite parity in the next frame>
+
+       u/b
+
+       The u and b matching are a bit special in the sense that they match
+       from the opposite parity flag. In the following examples, we assume
+       that we are currently matching the 2nd frame (Top:2, bottom:2).
+       According to the match, a 'x' is placed above and below each matched
+       fields.
+
+       With bottom matching (field=bottom):
+
+	       Match:		c	  p	      n 	 b	    u
+
+				x	x		x	 x	    x
+		 Top	      1 2 2	1 2 2	    1 2 2      1 2 2	  1 2 2
+		 Bottom       1 2 3	1 2 3	    1 2 3      1 2 3	  1 2 3
+				x	  x	      x        x	      x
+
+	       Output frames:
+				2	   1	      2 	 2	    2
+				2	   2	      2 	 1	    3
+
+       With top matching (field=top):
+
+	       Match:		c	  p	      n 	 b	    u
+
+				x	  x	      x        x	      x
+		 Top	      1 2 2	1 2 2	    1 2 2      1 2 2	  1 2 2
+		 Bottom       1 2 3	1 2 3	    1 2 3      1 2 3	  1 2 3
+				x	x		x	 x	    x
+
+	       Output frames:
+				2	   2	      2 	 1	    2
+				2	   1	      3 	 2	    2
+
+       Examples
+
+       Simple IVTC of a top field first telecined stream:
+
+	       fieldmatch=order=tff:combmatch=none, decimate
+
+       Advanced IVTC, with fallback on yadif for still combed frames:
+
+	       fieldmatch=order=tff:combmatch=full, yadif=deint=interlaced, decimate
+
+   fieldorder
+       Transform the field order of the input video.
+
+       It accepts the following parameters:
+
+       order
+	   The output field order. Valid values are tff for top field first or
+	   bff for bottom field first.
+
+       The default value is tff.
+
+       The transformation is done by shifting the picture content up or down
+       by one line, and filling the remaining line with appropriate picture
+       content.  This method is consistent with most broadcast field order
+       converters.
+
+       If the input video is not flagged as being interlaced, or it is already
+       flagged as being of the required output field order, then this filter
+       does not alter the incoming video.
+
+       It is very useful when converting to or from PAL DV material, which is
+       bottom field first.
+
+       For example:
+
+	       ffmpeg -i in.vob -vf "fieldorder=bff" out.dv
+
+   fillborders
+       Fill borders of the input video, without changing video stream
+       dimensions.  Sometimes video can have garbage at the four edges and you
+       may not want to crop video input to keep size multiple of some number.
+
+       This filter accepts the following options:
+
+       left
+	   Number of pixels to fill from left border.
+
+       right
+	   Number of pixels to fill from right border.
+
+       top Number of pixels to fill from top border.
+
+       bottom
+	   Number of pixels to fill from bottom border.
+
+       mode
+	   Set fill mode.
+
+	   It accepts the following values:
+
+	   smear
+	       fill pixels using outermost pixels
+
+	   mirror
+	       fill pixels using mirroring (half sample symmetric)
+
+	   fixed
+	       fill pixels with constant value
+
+	   reflect
+	       fill pixels using reflecting (whole sample symmetric)
+
+	   wrap
+	       fill pixels using wrapping
+
+	   fade
+	       fade pixels to constant value
+
+	   margins
+	       fill pixels at top and bottom with weighted averages pixels
+	       near borders
+
+	   Default is smear.
+
+       color
+	   Set color for pixels in fixed or fade mode. Default is black.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   find_rect
+       Find a rectangular object in the input video.
+
+       The object to search for must be specified as a gray8 image specified
+       with the object option.
+
+       For each possible match, a score is computed. If the score reaches the
+       specified threshold, the object is considered found.
+
+       If the input video contains multiple instances of the object, the
+       filter will find only one of them.
+
+       When an object is found, the following metadata entries are set in the
+       matching frame:
+
+       lavfi.rect.w
+	   width of object
+
+       lavfi.rect.h
+	   height of object
+
+       lavfi.rect.x
+	   x position of object
+
+       lavfi.rect.y
+	   y position of object
+
+       lavfi.rect.score
+	   match score of the found object
+
+       It accepts the following options:
+
+       object
+	   Filepath of the object image, needs to be in gray8.
+
+       threshold
+	   Detection threshold, expressed as a decimal number in the range
+	   0-1.
+
+	   A threshold value of 0.01 means only exact matches, a threshold of
+	   0.99 means almost everything matches.
+
+	   Default value is 0.5.
+
+       mipmaps
+	   Number of mipmaps, default is 3.
+
+       xmin, ymin, xmax, ymax
+	   Specifies the rectangle in which to search.
+
+       discard
+	   Discard frames where object is not detected. Default is disabled.
+
+       Examples
+
+       o   Cover a rectangular object by the supplied image of a given video
+	   using ffmpeg:
+
+		   ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv
+
+       o   Find the position of an object in each frame using ffprobe and
+	   write it to a log file:
+
+		   ffprobe -f lavfi movie=test.mp4,find_rect=object=object.pgm:threshold=0.3 \
+		     -show_entries frame=pkt_pts_time:frame_tags=lavfi.rect.x,lavfi.rect.y \
+		     -of csv -o find_rect.csv
+
+   floodfill
+       Flood area with values of same pixel components with another values.
+
+       It accepts the following options:
+
+       x   Set pixel x coordinate.
+
+       y   Set pixel y coordinate.
+
+       s0  Set source #0 component value.
+
+       s1  Set source #1 component value.
+
+       s2  Set source #2 component value.
+
+       s3  Set source #3 component value.
+
+       d0  Set destination #0 component value.
+
+       d1  Set destination #1 component value.
+
+       d2  Set destination #2 component value.
+
+       d3  Set destination #3 component value.
+
+   format
+       Convert the input video to one of the specified pixel formats.
+       Libavfilter will try to pick one that is suitable as input to the next
+       filter.
+
+       It accepts the following parameters:
+
+       pix_fmts
+	   A '|'-separated list of pixel format names, such as
+	   "pix_fmts=yuv420p|monow|rgb24".
+
+       color_spaces
+	   A '|'-separated list of color space names, such as
+	   "color_spaces=bt709|bt470bg|bt2020nc".
+
+       color_ranges
+	   A '|'-separated list of color range names, such as
+	   "color_spaces=tv|pc".
+
+       Examples
+
+       o   Convert the input video to the yuv420p format
+
+		   format=pix_fmts=yuv420p
+
+	   Convert the input video to any of the formats in the list
+
+		   format=pix_fmts=yuv420p|yuv444p|yuv410p
+
+   fps
+       Convert the video to specified constant frame rate by duplicating or
+       dropping frames as necessary.
+
+       It accepts the following parameters:
+
+       fps The desired output frame rate. It accepts expressions containing
+	   the following constants:
+
+	   source_fps
+	       The input's frame rate
+
+	   ntsc
+	       NTSC frame rate of "30000/1001"
+
+	   pal PAL frame rate of 25.0
+
+	   film
+	       Film frame rate of 24.0
+
+	   ntsc_film
+	       NTSC-film frame rate of "24000/1001"
+
+	   The default is 25.
+
+       start_time
+	   Assume the first PTS should be the given value, in seconds. This
+	   allows for padding/trimming at the start of stream. By default, no
+	   assumption is made about the first frame's expected PTS, so no
+	   padding or trimming is done.  For example, this could be set to 0
+	   to pad the beginning with duplicates of the first frame if a video
+	   stream starts after the audio stream or to trim any frames with a
+	   negative PTS.
+
+       round
+	   Timestamp (PTS) rounding method.
+
+	   Possible values are:
+
+	   zero
+	       round towards 0
+
+	   inf round away from 0
+
+	   down
+	       round towards -infinity
+
+	   up  round towards +infinity
+
+	   near
+	       round to nearest
+
+	   The default is "near".
+
+       eof_action
+	   Action performed when reading the last frame.
+
+	   Possible values are:
+
+	   round
+	       Use same timestamp rounding method as used for other frames.
+
+	   pass
+	       Pass through last frame if input duration has not been reached
+	       yet.
+
+	   The default is "round".
+
+       Alternatively, the options can be specified as a flat string:
+       fps[:start_time[:round]].
+
+       See also the setpts filter.
+
+       Examples
+
+       o   A typical usage in order to set the fps to 25:
+
+		   fps=fps=25
+
+       o   Sets the fps to 24, using abbreviation and rounding method to round
+	   to nearest:
+
+		   fps=fps=film:round=near
+
+   framepack
+       Pack two different video streams into a stereoscopic video, setting
+       proper metadata on supported codecs. The two views should have the same
+       size and framerate and processing will stop when the shorter video
+       ends. Please note that you may conveniently adjust view properties with
+       the scale and fps filters.
+
+       It accepts the following parameters:
+
+       format
+	   The desired packing format. Supported values are:
+
+	   sbs The views are next to each other (default).
+
+	   tab The views are on top of each other.
+
+	   lines
+	       The views are packed by line.
+
+	   columns
+	       The views are packed by column.
+
+	   frameseq
+	       The views are temporally interleaved.
+
+       Some examples:
+
+	       # Convert left and right views into a frame-sequential video
+	       ffmpeg -i LEFT -i RIGHT -filter_complex framepack=frameseq OUTPUT
+
+	       # Convert views into a side-by-side video with the same output resolution as the input
+	       ffmpeg -i LEFT -i RIGHT -filter_complex [0:v]scale=w=iw/2[left],[1:v]scale=w=iw/2[right],[left][right]framepack=sbs OUTPUT
+
+   framerate
+       Change the frame rate by interpolating new video output frames from the
+       source frames.
+
+       This filter is not designed to function correctly with interlaced
+       media. If you wish to change the frame rate of interlaced media then
+       you are required to deinterlace before this filter and re-interlace
+       after this filter.
+
+       A description of the accepted options follows.
+
+       fps Specify the output frames per second. This option can also be
+	   specified as a value alone. The default is 50.
+
+       interp_start
+	   Specify the start of a range where the output frame will be created
+	   as a linear interpolation of two frames. The range is [0-255], the
+	   default is 15.
+
+       interp_end
+	   Specify the end of a range where the output frame will be created
+	   as a linear interpolation of two frames. The range is [0-255], the
+	   default is 240.
+
+       scene
+	   Specify the level at which a scene change is detected as a value
+	   between 0 and 100 to indicate a new scene; a low value reflects a
+	   low probability for the current frame to introduce a new scene,
+	   while a higher value means the current frame is more likely to be
+	   one.  The default is 8.2.
+
+       flags
+	   Specify flags influencing the filter process.
+
+	   Available value for flags is:
+
+	   scene_change_detect, scd
+	       Enable scene change detection using the value of the option
+	       scene.  This flag is enabled by default.
+
+   framestep
+       Select one frame every N-th frame.
+
+       This filter accepts the following option:
+
+       step
+	   Select frame after every "step" frames.  Allowed values are
+	   positive integers higher than 0. Default value is 1.
+
+   freezedetect
+       Detect frozen video.
+
+       This filter logs a message and sets frame metadata when it detects that
+       the input video has no significant change in content during a specified
+       duration.  Video freeze detection calculates the mean average absolute
+       difference of all the components of video frames and compares it to a
+       noise floor.
+
+       The printed times and duration are expressed in seconds. The
+       "lavfi.freezedetect.freeze_start" metadata key is set on the first
+       frame whose timestamp equals or exceeds the detection duration and it
+       contains the timestamp of the first frame of the freeze. The
+       "lavfi.freezedetect.freeze_duration" and
+       "lavfi.freezedetect.freeze_end" metadata keys are set on the first
+       frame after the freeze.
+
+       The filter accepts the following options:
+
+       noise, n
+	   Set noise tolerance. Can be specified in dB (in case "dB" is
+	   appended to the specified value) or as a difference ratio between 0
+	   and 1. Default is -60dB, or 0.001.
+
+       duration, d
+	   Set freeze duration until notification (default is 2 seconds).
+
+   freezeframes
+       Freeze video frames.
+
+       This filter freezes video frames using frame from 2nd input.
+
+       The filter accepts the following options:
+
+       first
+	   Set number of first frame from which to start freeze.
+
+       last
+	   Set number of last frame from which to end freeze.
+
+       replace
+	   Set number of frame from 2nd input which will be used instead of
+	   replaced frames.
+
+   frei0r
+       Apply a frei0r effect to the input video.
+
+       To enable the compilation of this filter, you need to install the
+       frei0r header and configure FFmpeg with "--enable-frei0r".
+
+       It accepts the following parameters:
+
+       filter_name
+	   The name of the frei0r effect to load. If the environment variable
+	   FREI0R_PATH is defined, the frei0r effect is searched for in each
+	   of the directories specified by the colon-separated list in
+	   FREI0R_PATH.  Otherwise, the standard frei0r paths are searched, in
+	   this order: HOME/.frei0r-1/lib/, /usr/local/lib/frei0r-1/,
+	   /usr/lib/frei0r-1/.
+
+       filter_params
+	   A '|'-separated list of parameters to pass to the frei0r effect.
+
+       A frei0r effect parameter can be a boolean (its value is either "y" or
+       "n"), a double, a color (specified as R/G/B, where R, G, and B are
+       floating point numbers between 0.0 and 1.0, inclusive) or a color
+       description as specified in the "Color" section in the ffmpeg-utils
+       manual, a position (specified as X/Y, where X and Y are floating point
+       numbers) and/or a string.
+
+       The number and types of parameters depend on the loaded effect. If an
+       effect parameter is not specified, the default value is set.
+
+       Examples
+
+       o   Apply the distort0r effect, setting the first two double
+	   parameters:
+
+		   frei0r=filter_name=distort0r:filter_params=0.5|0.01
+
+       o   Apply the colordistance effect, taking a color as the first
+	   parameter:
+
+		   frei0r=colordistance:0.2/0.3/0.4
+		   frei0r=colordistance:violet
+		   frei0r=colordistance:0x112233
+
+       o   Apply the perspective effect, specifying the top left and top right
+	   image positions:
+
+		   frei0r=perspective:0.2/0.2|0.8/0.2
+
+       For more information, see <http://frei0r.dyne.org>
+
+       Commands
+
+       This filter supports the filter_params option as commands.
+
+   fspp
+       Apply fast and simple postprocessing. It is a faster version of spp.
+
+       It splits (I)DCT into horizontal/vertical passes. Unlike the simple
+       post- processing filter, one of them is performed once per block, not
+       per pixel.  This allows for much higher speed.
+
+       The filter accepts the following options:
+
+       quality
+	   Set quality. This option defines the number of levels for
+	   averaging. It accepts an integer in the range 4-5. Default value is
+	   4.
+
+       qp  Force a constant quantization parameter. It accepts an integer in
+	   range 0-63.	If not set, the filter will use the QP from the video
+	   stream (if available).
+
+       strength
+	   Set filter strength. It accepts an integer in range -15 to 32.
+	   Lower values mean more details but also more artifacts, while
+	   higher values make the image smoother but also blurrier. Default
+	   value is 0 X PSNR optimal.
+
+       use_bframe_qp
+	   Enable the use of the QP from the B-Frames if set to 1. Using this
+	   option may cause flicker since the B-Frames have often larger QP.
+	   Default is 0 (not enabled).
+
+   fsync
+       Synchronize video frames with an external mapping from a file.
+
+       For each input PTS given in the map file it either drops or creates as
+       many frames as necessary to recreate the sequence of output frames
+       given in the map file.
+
+       This filter is useful to recreate the output frames of a framerate
+       conversion by the fps filter, recorded into a map file using the ffmpeg
+       option "-stats_mux_pre", and do further processing to the corresponding
+       frames e.g. quality comparison.
+
+       Each line of the map file must contain three items per input frame, the
+       input PTS (decimal), the output PTS (decimal) and the output TIMEBASE
+       (decimal/decimal), seperated by a space.  This file format corresponds
+       to the output of "-stats_mux_pre_fmt="{ptsi} {pts} {tb}"".
+
+       The filter assumes the map file is sorted by increasing input PTS.
+
+       The filter accepts the following options:
+
+       file, f
+	   The filename of the map file to be used.
+
+       Example:
+
+	       # Convert a video to 25 fps and record a MAP_FILE file with the default format of this filter
+	       ffmpeg -i INPUT -vf fps=fps=25 -stats_mux_pre MAP_FILE -stats_mux_pre_fmt "{ptsi} {pts} {tb}" OUTPUT
+
+	       # Sort MAP_FILE by increasing input PTS
+	       sort -n MAP_FILE
+
+	       # Use INPUT, OUTPUT and the MAP_FILE from above to compare the corresponding frames in INPUT and OUTPUT via SSIM
+	       ffmpeg -i INPUT -i OUTPUT -filter_complex '[0:v]fsync=file=MAP_FILE[ref];[1:v][ref]ssim' -f null -
+
+   gblur
+       Apply Gaussian blur filter.
+
+       The filter accepts the following options:
+
+       sigma
+	   Set horizontal sigma, standard deviation of Gaussian blur. Default
+	   is 0.5.
+
+       steps
+	   Set number of steps for Gaussian approximation. Default is 1.
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       sigmaV
+	   Set vertical sigma, if negative it will be same as "sigma".
+	   Default is "-1".
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   geq
+       Apply generic equation to each pixel.
+
+       The filter accepts the following options:
+
+       lum_expr, lum
+	   Set the luma expression.
+
+       cb_expr, cb
+	   Set the chrominance blue expression.
+
+       cr_expr, cr
+	   Set the chrominance red expression.
+
+       alpha_expr, a
+	   Set the alpha expression.
+
+       red_expr, r
+	   Set the red expression.
+
+       green_expr, g
+	   Set the green expression.
+
+       blue_expr, b
+	   Set the blue expression.
+
+       The colorspace is selected according to the specified options. If one
+       of the lum_expr, cb_expr, or cr_expr options is specified, the filter
+       will automatically select a YCbCr colorspace. If one of the red_expr,
+       green_expr, or blue_expr options is specified, it will select an RGB
+       colorspace.
+
+       If one of the chrominance expression is not defined, it falls back on
+       the other one. If no alpha expression is specified it will evaluate to
+       opaque value.  If none of chrominance expressions are specified, they
+       will evaluate to the luma expression.
+
+       The expressions can use the following variables and functions:
+
+       N   The sequential number of the filtered frame, starting from 0.
+
+       X
+       Y   The coordinates of the current sample.
+
+       W
+       H   The width and height of the image.
+
+       SW
+       SH  Width and height scale depending on the currently filtered plane.
+	   It is the ratio between the corresponding luma plane number of
+	   pixels and the current plane ones. E.g. for YUV4:2:0 the values are
+	   "1,1" for the luma plane, and "0.5,0.5" for chroma planes.
+
+       T   Time of the current frame, expressed in seconds.
+
+       p(x, y)
+	   Return the value of the pixel at location (x,y) of the current
+	   plane.
+
+       lum(x, y)
+	   Return the value of the pixel at location (x,y) of the luma plane.
+
+       cb(x, y)
+	   Return the value of the pixel at location (x,y) of the blue-
+	   difference chroma plane. Return 0 if there is no such plane.
+
+       cr(x, y)
+	   Return the value of the pixel at location (x,y) of the red-
+	   difference chroma plane. Return 0 if there is no such plane.
+
+       r(x, y)
+       g(x, y)
+       b(x, y)
+	   Return the value of the pixel at location (x,y) of the
+	   red/green/blue component. Return 0 if there is no such component.
+
+       alpha(x, y)
+	   Return the value of the pixel at location (x,y) of the alpha plane.
+	   Return 0 if there is no such plane.
+
+       psum(x,y), lumsum(x, y), cbsum(x,y), crsum(x,y), rsum(x,y), gsum(x,y),
+       bsum(x,y), alphasum(x,y)
+	   Sum of sample values in the rectangle from (0,0) to (x,y), this
+	   allows obtaining sums of samples within a rectangle. See the
+	   functions without the sum postfix.
+
+       interpolation
+	   Set one of interpolation methods:
+
+	   nearest, n
+	   bilinear, b
+
+	   Default is bilinear.
+
+       For functions, if x and y are outside the area, the value will be
+       automatically clipped to the closer edge.
+
+       Please note that this filter can use multiple threads in which case
+       each slice will have its own expression state. If you want to use only
+       a single expression state because your expressions depend on previous
+       state then you should limit the number of filter threads to 1.
+
+       Examples
+
+       o   Flip the image horizontally:
+
+		   geq=p(W-X\,Y)
+
+       o   Generate a bidimensional sine wave, with angle "PI/3" and a
+	   wavelength of 100 pixels:
+
+		   geq=128 + 100*sin(2*(PI/100)*(cos(PI/3)*(X-50*T) + sin(PI/3)*Y)):128:128
+
+       o   Generate a fancy enigmatic moving light:
+
+		   nullsrc=s=256x256,geq=random(1)/hypot(X-cos(N*0.07)*W/2-W/2\,Y-sin(N*0.09)*H/2-H/2)^2*1000000*sin(N*0.02):128:128
+
+       o   Generate a quick emboss effect:
+
+		   format=gray,geq=lum_expr='(p(X,Y)+(256-p(X-4,Y-4)))/2'
+
+       o   Modify RGB components depending on pixel position:
+
+		   geq=r='X/W*r(X,Y)':g='(1-X/W)*g(X,Y)':b='(H-Y)/H*b(X,Y)'
+
+       o   Create a radial gradient that is the same size as the input (also
+	   see the vignette filter):
+
+		   geq=lum=255*gauss((X/W-0.5)*3)*gauss((Y/H-0.5)*3)/gauss(0)/gauss(0),format=gray
+
+   gradfun
+       Fix the banding artifacts that are sometimes introduced into nearly
+       flat regions by truncation to 8-bit color depth.  Interpolate the
+       gradients that should go where the bands are, and dither them.
+
+       It is designed for playback only.  Do not use it prior to lossy
+       compression, because compression tends to lose the dither and bring
+       back the bands.
+
+       It accepts the following parameters:
+
+       strength
+	   The maximum amount by which the filter will change any one pixel.
+	   This is also the threshold for detecting nearly flat regions.
+	   Acceptable values range from .51 to 64; the default value is 1.2.
+	   Out-of-range values will be clipped to the valid range.
+
+       radius
+	   The neighborhood to fit the gradient to. A larger radius makes for
+	   smoother gradients, but also prevents the filter from modifying the
+	   pixels near detailed regions. Acceptable values are 8-32; the
+	   default value is 16. Out-of-range values will be clipped to the
+	   valid range.
+
+       Alternatively, the options can be specified as a flat string:
+       strength[:radius]
+
+       Examples
+
+       o   Apply the filter with a 3.5 strength and radius of 8:
+
+		   gradfun=3.5:8
+
+       o   Specify radius, omitting the strength (which will fall-back to the
+	   default value):
+
+		   gradfun=radius=8
+
+   graphmonitor
+       Show various filtergraph stats.
+
+       With this filter one can debug complete filtergraph.  Especially issues
+       with links filling with queued frames.
+
+       The filter accepts the following options:
+
+       size, s
+	   Set video output size. Default is hd720.
+
+       opacity, o
+	   Set video opacity. Default is 0.9. Allowed range is from 0 to 1.
+
+       mode, m
+	   Set output mode flags.
+
+	   Available values for flags are:
+
+	   full
+	       No any filtering. Default.
+
+	   compact
+	       Show only filters with queued frames.
+
+	   nozero
+	       Show only filters with non-zero stats.
+
+	   noeof
+	       Show only filters with non-eof stat.
+
+	   nodisabled
+	       Show only filters that are enabled in timeline.
+
+       flags, f
+	   Set flags which enable which stats are shown in video.
+
+	   Available values for flags are:
+
+	   none
+	       All flags turned off.
+
+	   all All flags turned on.
+
+	   queue
+	       Display number of queued frames in each link.
+
+	   frame_count_in
+	       Display number of frames taken from filter.
+
+	   frame_count_out
+	       Display number of frames given out from filter.
+
+	   frame_count_delta
+	       Display delta number of frames between above two values.
+
+	   pts Display current filtered frame pts.
+
+	   pts_delta
+	       Display pts delta between current and previous frame.
+
+	   time
+	       Display current filtered frame time.
+
+	   time_delta
+	       Display time delta between current and previous frame.
+
+	   timebase
+	       Display time base for filter link.
+
+	   format
+	       Display used format for filter link.
+
+	   size
+	       Display video size or number of audio channels in case of audio
+	       used by filter link.
+
+	   rate
+	       Display video frame rate or sample rate in case of audio used
+	       by filter link.
+
+	   eof Display link output status.
+
+	   sample_count_in
+	       Display number of samples taken from filter.
+
+	   sample_count_out
+	       Display number of samples given out from filter.
+
+	   sample_count_delta
+	       Display delta number of samples between above two values.
+
+	   disabled
+	       Show the timeline filter status.
+
+       rate, r
+	   Set upper limit for video rate of output stream, Default value is
+	   25.	This guarantee that output video frame rate will not be higher
+	   than this value.
+
+   grayworld
+       A color constancy filter that applies color correction based on the
+       grayworld assumption
+
+       See:
+       <https://www.researchgate.net/publication/275213614_A_New_Color_Correction_Method_for_Underwater_Imaging>
+
+       The algorithm  uses linear light, so input data should be linearized
+       beforehand (and possibly correctly tagged).
+
+	       ffmpeg -i INPUT -vf zscale=transfer=linear,grayworld,zscale=transfer=bt709,format=yuv420p OUTPUT
+
+   greyedge
+       A color constancy variation filter which estimates scene illumination
+       via grey edge algorithm and corrects the scene colors accordingly.
+
+       See: <https://staff.science.uva.nl/th.gevers/pub/GeversTIP07.pdf>
+
+       The filter accepts the following options:
+
+       difford
+	   The order of differentiation to be applied on the scene. Must be
+	   chosen in the range [0,2] and default value is 1.
+
+       minknorm
+	   The Minkowski parameter to be used for calculating the Minkowski
+	   distance. Must be chosen in the range [0,20] and default value is
+	   1. Set to 0 for getting max value instead of calculating Minkowski
+	   distance.
+
+       sigma
+	   The standard deviation of Gaussian blur to be applied on the scene.
+	   Must be chosen in the range [0,1024.0] and default value = 1.
+	   floor( sigma * break_off_sigma(3) ) can't be equal to 0 if difford
+	   is greater than 0.
+
+       Examples
+
+       o   Grey Edge:
+
+		   greyedge=difford=1:minknorm=5:sigma=2
+
+       o   Max Edge:
+
+		   greyedge=difford=1:minknorm=0:sigma=2
+
+   guided
+       Apply guided filter for edge-preserving smoothing, dehazing and so on.
+
+       The filter accepts the following options:
+
+       radius
+	   Set the box radius in pixels.  Allowed range is 1 to 20. Default is
+	   3.
+
+       eps Set regularization parameter (with square).	Allowed range is 0 to
+	   1. Default is 0.01.
+
+       mode
+	   Set filter mode. Can be "basic" or "fast".  Default is "basic".
+
+       sub Set subsampling ratio for "fast" mode.  Range is 2 to 64. Default
+	   is 4.  No subsampling occurs in "basic" mode.
+
+       guidance
+	   Set guidance mode. Can be "off" or "on". Default is "off".  If
+	   "off", single input is required.  If "on", two inputs of the same
+	   resolution and pixel format are required.  The second input serves
+	   as the guidance.
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Edge-preserving smoothing with guided filter:
+
+		   ffmpeg -i in.png -vf guided out.png
+
+       o   Dehazing, structure-transferring filtering, detail enhancement with
+	   guided filter.  For the generation of guidance image, refer to
+	   paper "Guided Image Filtering".  See:
+	   <http://kaiminghe.com/publications/pami12guidedfilter.pdf>.
+
+		   ffmpeg -i in.png -i guidance.png -filter_complex guided=guidance=on out.png
+
+   haldclut
+       Apply a Hald CLUT to a video stream.
+
+       First input is the video stream to process, and second one is the Hald
+       CLUT.  The Hald CLUT input can be a simple picture or a complete video
+       stream.
+
+       The filter accepts the following options:
+
+       clut
+	   Set which CLUT video frames will be processed from second input
+	   stream, can be first or all. Default is all.
+
+       shortest
+	   Force termination when the shortest input terminates. Default is 0.
+
+       repeatlast
+	   Continue applying the last CLUT after the end of the stream. A
+	   value of 0 disable the filter after the last frame of the CLUT is
+	   reached.  Default is 1.
+
+       "haldclut" also has the same interpolation options as lut3d (both
+       filters share the same internals).
+
+       This filter also supports the framesync options.
+
+       More information about the Hald CLUT can be found on Eskil Steenberg's
+       website (Hald CLUT author) at
+       <http://www.quelsolaar.com/technology/clut.html>.
+
+       Commands
+
+       This filter supports the "interp" option as commands.
+
+       Workflow examples
+
+       Hald CLUT video stream
+
+       Generate an identity Hald CLUT stream altered with various effects:
+
+	       ffmpeg -f lavfi -i B<haldclutsrc>=8 -vf "hue=H=2*PI*t:s=sin(2*PI*t)+1, curves=cross_process" -t 10 -c:v ffv1 clut.nut
+
+       Note: make sure you use a lossless codec.
+
+       Then use it with "haldclut" to apply it on some random stream:
+
+	       ffmpeg -f lavfi -i mandelbrot -i clut.nut -filter_complex '[0][1] haldclut' -t 20 mandelclut.mkv
+
+       The Hald CLUT will be applied to the 10 first seconds (duration of
+       clut.nut), then the latest picture of that CLUT stream will be applied
+       to the remaining frames of the "mandelbrot" stream.
+
+       Hald CLUT with preview
+
+       A Hald CLUT is supposed to be a squared image of "Level*Level*Level" by
+       "Level*Level*Level" pixels. For a given Hald CLUT, FFmpeg will select
+       the biggest possible square starting at the top left of the picture.
+       The remaining padding pixels (bottom or right) will be ignored. This
+       area can be used to add a preview of the Hald CLUT.
+
+       Typically, the following generated Hald CLUT will be supported by the
+       "haldclut" filter:
+
+	       ffmpeg -f lavfi -i B<haldclutsrc>=8 -vf "
+		  pad=iw+320 [padded_clut];
+		  smptebars=s=320x256, split [a][b];
+		  [padded_clut][a] overlay=W-320:h, curves=color_negative [main];
+		  [main][b] overlay=W-320" -frames:v 1 clut.png
+
+       It contains the original and a preview of the effect of the CLUT: SMPTE
+       color bars are displayed on the right-top, and below the same color
+       bars processed by the color changes.
+
+       Then, the effect of this Hald CLUT can be visualized with:
+
+	       ffplay input.mkv -vf "movie=clut.png, [in] haldclut"
+
+   hflip
+       Flip the input video horizontally.
+
+       For example, to horizontally flip the input video with ffmpeg:
+
+	       ffmpeg -i in.avi -vf "hflip" out.avi
+
+   histeq
+       This filter applies a global color histogram equalization on a per-
+       frame basis.
+
+       It can be used to correct video that has a compressed range of pixel
+       intensities.  The filter redistributes the pixel intensities to
+       equalize their distribution across the intensity range. It may be
+       viewed as an "automatically adjusting contrast filter". This filter is
+       useful only for correcting degraded or poorly captured source video.
+
+       The filter accepts the following options:
+
+       strength
+	   Determine the amount of equalization to be applied.	As the
+	   strength is reduced, the distribution of pixel intensities more-
+	   and-more approaches that of the input frame. The value must be a
+	   float number in the range [0,1] and defaults to 0.200.
+
+       intensity
+	   Set the maximum intensity that can generated and scale the output
+	   values appropriately.  The strength should be set as desired and
+	   then the intensity can be limited if needed to avoid washing-out.
+	   The value must be a float number in the range [0,1] and defaults to
+	   0.210.
+
+       antibanding
+	   Set the antibanding level. If enabled the filter will randomly vary
+	   the luminance of output pixels by a small amount to avoid banding
+	   of the histogram. Possible values are "none", "weak" or "strong".
+	   It defaults to "none".
+
+   histogram
+       Compute and draw a color distribution histogram for the input video.
+
+       The computed histogram is a representation of the color component
+       distribution in an image.
+
+       Standard histogram displays the color components distribution in an
+       image.  Displays color graph for each color component. Shows
+       distribution of the Y, U, V, A or R, G, B components, depending on
+       input format, in the current frame. Below each graph a color component
+       scale meter is shown.
+
+       The filter accepts the following options:
+
+       level_height
+	   Set height of level. Default value is 200.  Allowed range is [50,
+	   2048].
+
+       scale_height
+	   Set height of color scale. Default value is 12.  Allowed range is
+	   [0, 40].
+
+       display_mode
+	   Set display mode.  It accepts the following values:
+
+	   stack
+	       Per color component graphs are placed below each other.
+
+	   parade
+	       Per color component graphs are placed side by side.
+
+	   overlay
+	       Presents information identical to that in the "parade", except
+	       that the graphs representing color components are superimposed
+	       directly over one another.
+
+	   Default is "stack".
+
+       levels_mode
+	   Set mode. Can be either "linear", or "logarithmic".	Default is
+	   "linear".
+
+       components
+	   Set what color components to display.  Default is 7.
+
+       fgopacity
+	   Set foreground opacity. Default is 0.7.
+
+       bgopacity
+	   Set background opacity. Default is 0.5.
+
+       colors_mode
+	   Set colors mode.  It accepts the following values:
+
+	   whiteonblack
+	   blackonwhite
+	   whiteongray
+	   blackongray
+	   coloronblack
+	   coloronwhite
+	   colorongray
+	   blackoncolor
+	   whiteoncolor
+	   grayoncolor
+
+	   Default is "whiteonblack".
+
+       Examples
+
+       o   Calculate and draw histogram:
+
+		   ffplay -i input -vf histogram
+
+   hqdn3d
+       This is a high precision/quality 3d denoise filter. It aims to reduce
+       image noise, producing smooth images and making still images really
+       still. It should enhance compressibility.
+
+       It accepts the following optional parameters:
+
+       luma_spatial
+	   A non-negative floating point number which specifies spatial luma
+	   strength.  It defaults to 4.0.
+
+       chroma_spatial
+	   A non-negative floating point number which specifies spatial chroma
+	   strength.  It defaults to 3.0*luma_spatial/4.0.
+
+       luma_tmp
+	   A floating point number which specifies luma temporal strength. It
+	   defaults to 6.0*luma_spatial/4.0.
+
+       chroma_tmp
+	   A floating point number which specifies chroma temporal strength.
+	   It defaults to luma_tmp*chroma_spatial/luma_spatial.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   hwdownload
+       Download hardware frames to system memory.
+
+       The input must be in hardware frames, and the output a non-hardware
+       format.	Not all formats will be supported on the output - it may be
+       necessary to insert an additional format filter immediately following
+       in the graph to get the output in a supported format.
+
+   hwmap
+       Map hardware frames to system memory or to another device.
+
+       This filter has several different modes of operation; which one is used
+       depends on the input and output formats:
+
+       o   Hardware frame input, normal frame output
+
+	   Map the input frames to system memory and pass them to the output.
+	   If the original hardware frame is later required (for example,
+	   after overlaying something else on part of it), the hwmap filter
+	   can be used again in the next mode to retrieve it.
+
+       o   Normal frame input, hardware frame output
+
+	   If the input is actually a software-mapped hardware frame, then
+	   unmap it - that is, return the original hardware frame.
+
+	   Otherwise, a device must be provided.  Create new hardware surfaces
+	   on that device for the output, then map them back to the software
+	   format at the input and give those frames to the preceding filter.
+	   This will then act like the hwupload filter, but may be able to
+	   avoid an additional copy when the input is already in a compatible
+	   format.
+
+       o   Hardware frame input and output
+
+	   A device must be supplied for the output, either directly or with
+	   the derive_device option.  The input and output devices must be of
+	   different types and compatible - the exact meaning of this is
+	   system-dependent, but typically it means that they must refer to
+	   the same underlying hardware context (for example, refer to the
+	   same graphics card).
+
+	   If the input frames were originally created on the output device,
+	   then unmap to retrieve the original frames.
+
+	   Otherwise, map the frames to the output device - create new
+	   hardware frames on the output corresponding to the frames on the
+	   input.
+
+       The following additional parameters are accepted:
+
+       mode
+	   Set the frame mapping mode.	Some combination of:
+
+	   read
+	       The mapped frame should be readable.
+
+	   write
+	       The mapped frame should be writeable.
+
+	   overwrite
+	       The mapping will always overwrite the entire frame.
+
+	       This may improve performance in some cases, as the original
+	       contents of the frame need not be loaded.
+
+	   direct
+	       The mapping must not involve any copying.
+
+	       Indirect mappings to copies of frames are created in some cases
+	       where either direct mapping is not possible or it would have
+	       unexpected properties.  Setting this flag ensures that the
+	       mapping is direct and will fail if that is not possible.
+
+	   Defaults to read+write if not specified.
+
+       derive_device type
+	   Rather than using the device supplied at initialisation, instead
+	   derive a new device of type type from the device the input frames
+	   exist on.
+
+       reverse
+	   In a hardware to hardware mapping, map in reverse - create frames
+	   in the sink and map them back to the source.  This may be necessary
+	   in some cases where a mapping in one direction is required but only
+	   the opposite direction is supported by the devices being used.
+
+	   This option is dangerous - it may break the preceding filter in
+	   undefined ways if there are any additional constraints on that
+	   filter's output.  Do not use it without fully understanding the
+	   implications of its use.
+
+   hwupload
+       Upload system memory frames to hardware surfaces.
+
+       The device to upload to must be supplied when the filter is
+       initialised.  If using ffmpeg, select the appropriate device with the
+       -filter_hw_device option or with the derive_device option.  The input
+       and output devices must be of different types and compatible - the
+       exact meaning of this is system-dependent, but typically it means that
+       they must refer to the same underlying hardware context (for example,
+       refer to the same graphics card).
+
+       The following additional parameters are accepted:
+
+       derive_device type
+	   Rather than using the device supplied at initialisation, instead
+	   derive a new device of type type from the device the input frames
+	   exist on.
+
+   hwupload_cuda
+       Upload system memory frames to a CUDA device.
+
+       It accepts the following optional parameters:
+
+       device
+	   The number of the CUDA device to use
+
+   hqx
+       Apply a high-quality magnification filter designed for pixel art. This
+       filter was originally created by Maxim Stepin.
+
+       It accepts the following option:
+
+       n   Set the scaling dimension: 2 for "hq2x", 3 for "hq3x" and 4 for
+	   "hq4x".  Default is 3.
+
+   hstack
+       Stack input videos horizontally.
+
+       All streams must be of same pixel format and of same height.
+
+       Note that this filter is faster than using overlay and pad filter to
+       create same output.
+
+       The filter accepts the following option:
+
+       inputs
+	   Set number of input streams. Default is 2.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+   hsvhold
+       Turns a certain HSV range into gray values.
+
+       This filter measures color difference between set HSV color in options
+       and ones measured in video stream. Depending on options, output colors
+       can be changed to be gray or not.
+
+       The filter accepts the following options:
+
+       hue Set the hue value which will be used in color difference
+	   calculation.  Allowed range is from -360 to 360. Default value is
+	   0.
+
+       sat Set the saturation value which will be used in color difference
+	   calculation.  Allowed range is from -1 to 1. Default value is 0.
+
+       val Set the value which will be used in color difference calculation.
+	   Allowed range is from -1 to 1. Default value is 0.
+
+       similarity
+	   Set similarity percentage with the key color.  Allowed range is
+	   from 0 to 1. Default value is 0.01.
+
+	   0.00001 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.  Allowed range is from 0 to 1. Default value is
+	   0.
+
+	   0.0 makes pixels either fully gray, or not gray at all.
+
+	   Higher values result in more gray pixels, with a higher gray pixel
+	   the more similar the pixels color is to the key color.
+
+   hsvkey
+       Turns a certain HSV range into transparency.
+
+       This filter measures color difference between set HSV color in options
+       and ones measured in video stream. Depending on options, output colors
+       can be changed to transparent by adding alpha channel.
+
+       The filter accepts the following options:
+
+       hue Set the hue value which will be used in color difference
+	   calculation.  Allowed range is from -360 to 360. Default value is
+	   0.
+
+       sat Set the saturation value which will be used in color difference
+	   calculation.  Allowed range is from -1 to 1. Default value is 0.
+
+       val Set the value which will be used in color difference calculation.
+	   Allowed range is from -1 to 1. Default value is 0.
+
+       similarity
+	   Set similarity percentage with the key color.  Allowed range is
+	   from 0 to 1. Default value is 0.01.
+
+	   0.00001 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.  Allowed range is from 0 to 1. Default value is
+	   0.
+
+	   0.0 makes pixels either fully transparent, or not transparent at
+	   all.
+
+	   Higher values result in semi-transparent pixels, with a higher
+	   transparency the more similar the pixels color is to the key color.
+
+   hue
+       Modify the hue and/or the saturation of the input.
+
+       It accepts the following parameters:
+
+       h   Specify the hue angle as a number of degrees. It accepts an
+	   expression, and defaults to "0".
+
+       s   Specify the saturation in the [-10,10] range. It accepts an
+	   expression and defaults to "1".
+
+       H   Specify the hue angle as a number of radians. It accepts an
+	   expression, and defaults to "0".
+
+       b   Specify the brightness in the [-10,10] range. It accepts an
+	   expression and defaults to "0".
+
+       h and H are mutually exclusive, and can't be specified at the same
+       time.
+
+       The b, h, H and s option values are expressions containing the
+       following constants:
+
+       n   frame count of the input frame starting from 0
+
+       pts presentation timestamp of the input frame expressed in time base
+	   units
+
+       r   frame rate of the input video, NAN if the input frame rate is
+	   unknown
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       tb  time base of the input video
+
+       Examples
+
+       o   Set the hue to 90 degrees and the saturation to 1.0:
+
+		   hue=h=90:s=1
+
+       o   Same command but expressing the hue in radians:
+
+		   hue=H=PI/2:s=1
+
+       o   Rotate hue and make the saturation swing between 0 and 2 over a
+	   period of 1 second:
+
+		   hue="H=2*PI*t: s=sin(2*PI*t)+1"
+
+       o   Apply a 3 seconds saturation fade-in effect starting at 0:
+
+		   hue="s=min(t/3\,1)"
+
+	   The general fade-in expression can be written as:
+
+		   hue="s=min(0\, max((t-START)/DURATION\, 1))"
+
+       o   Apply a 3 seconds saturation fade-out effect starting at 5 seconds:
+
+		   hue="s=max(0\, min(1\, (8-t)/3))"
+
+	   The general fade-out expression can be written as:
+
+		   hue="s=max(0\, min(1\, (START+DURATION-t)/DURATION))"
+
+       Commands
+
+       This filter supports the following commands:
+
+       b
+       s
+       h
+       H   Modify the hue and/or the saturation and/or brightness of the input
+	   video.  The command accepts the same syntax of the corresponding
+	   option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   huesaturation
+       Apply hue-saturation-intensity adjustments to input video stream.
+
+       This filter operates in RGB colorspace.
+
+       This filter accepts the following options:
+
+       hue Set the hue shift in degrees to apply. Default is 0.  Allowed range
+	   is from -180 to 180.
+
+       saturation
+	   Set the saturation shift. Default is 0.  Allowed range is from -1
+	   to 1.
+
+       intensity
+	   Set the intensity shift. Default is 0.  Allowed range is from -1 to
+	   1.
+
+       colors
+	   Set which primary and complementary colors are going to be
+	   adjusted.  This options is set by providing one or multiple values.
+	   This can select multiple colors at once. By default all colors are
+	   selected.
+
+	   r   Adjust reds.
+
+	   y   Adjust yellows.
+
+	   g   Adjust greens.
+
+	   c   Adjust cyans.
+
+	   b   Adjust blues.
+
+	   m   Adjust magentas.
+
+	   a   Adjust all colors.
+
+       strength
+	   Set strength of filtering. Allowed range is from 0 to 100.  Default
+	   value is 1.
+
+       rw, gw, bw
+	   Set weight for each RGB component. Allowed range is from 0 to 1.
+	   By default is set to 0.333, 0.334, 0.333.  Those options are used
+	   in saturation and lightess processing.
+
+       lightness
+	   Set preserving lightness, by default is disabled.  Adjusting hues
+	   can change lightness from original RGB triplet, with this option
+	   enabled lightness is kept at same value.
+
+   hysteresis
+       Grow first stream into second stream by connecting components.  This
+       makes it possible to build more robust edge masks.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       threshold
+	   Set threshold which is used in filtering. If pixel component value
+	   is higher than this value filter algorithm for connecting
+	   components is activated.  By default value is 0.
+
+       The "hysteresis" filter also supports the framesync options.
+
+   iccdetect
+       Detect the colorspace  from an embedded ICC profile (if present), and
+       update the frame's tags accordingly.
+
+       This filter accepts the following options:
+
+       force
+	   If true, the frame's existing colorspace tags will always be
+	   overridden by values detected from an ICC profile. Otherwise, they
+	   will only be assigned if they contain "unknown". Enabled by
+	   default.
+
+   iccgen
+       Generate ICC profiles and attach them to frames.
+
+       This filter accepts the following options:
+
+       color_primaries
+       color_trc
+	   Configure the colorspace that the ICC profile will be generated
+	   for. The default value of "auto" infers the value from the input
+	   frame's metadata, defaulting to BT.709/sRGB as appropriate.
+
+	   See the setparams filter for a list of possible values, but note
+	   that "unknown" are not valid values for this filter.
+
+       force
+	   If true, an ICC profile will be generated even if it would
+	   overwrite an already existing ICC profile. Disabled by default.
+
+   identity
+       Obtain the identity score between two input videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained per component, average, min and max identity score is
+       printed through the logging system.
+
+       The filter stores the calculated identity scores of each frame in frame
+       metadata.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi identity -f null -
+
+   idet
+       Detect video interlacing type.
+
+       This filter tries to detect if the input frames are interlaced,
+       progressive, top or bottom field first. It will also try to detect
+       fields that are repeated between adjacent frames (a sign of telecine).
+
+       Single frame detection considers only immediately adjacent frames when
+       classifying each frame.	Multiple frame detection incorporates the
+       classification history of previous frames.
+
+       The filter will log these metadata values:
+
+       single.current_frame
+	   Detected type of current frame using single-frame detection. One
+	   of: ``tff'' (top field first), ``bff'' (bottom field first),
+	   ``progressive'', or ``undetermined''
+
+       single.tff
+	   Cumulative number of frames detected as top field first using
+	   single-frame detection.
+
+       multiple.tff
+	   Cumulative number of frames detected as top field first using
+	   multiple-frame detection.
+
+       single.bff
+	   Cumulative number of frames detected as bottom field first using
+	   single-frame detection.
+
+       multiple.current_frame
+	   Detected type of current frame using multiple-frame detection. One
+	   of: ``tff'' (top field first), ``bff'' (bottom field first),
+	   ``progressive'', or ``undetermined''
+
+       multiple.bff
+	   Cumulative number of frames detected as bottom field first using
+	   multiple-frame detection.
+
+       single.progressive
+	   Cumulative number of frames detected as progressive using single-
+	   frame detection.
+
+       multiple.progressive
+	   Cumulative number of frames detected as progressive using multiple-
+	   frame detection.
+
+       single.undetermined
+	   Cumulative number of frames that could not be classified using
+	   single-frame detection.
+
+       multiple.undetermined
+	   Cumulative number of frames that could not be classified using
+	   multiple-frame detection.
+
+       repeated.current_frame
+	   Which field in the current frame is repeated from the last. One of
+	   ``neither'', ``top'', or ``bottom''.
+
+       repeated.neither
+	   Cumulative number of frames with no repeated field.
+
+       repeated.top
+	   Cumulative number of frames with the top field repeated from the
+	   previous frame's top field.
+
+       repeated.bottom
+	   Cumulative number of frames with the bottom field repeated from the
+	   previous frame's bottom field.
+
+       The filter accepts the following options:
+
+       intl_thres
+	   Set interlacing threshold.
+
+       prog_thres
+	   Set progressive threshold.
+
+       rep_thres
+	   Threshold for repeated field detection.
+
+       half_life
+	   Number of frames after which a given frame's contribution to the
+	   statistics is halved (i.e., it contributes only 0.5 to its
+	   classification). The default of 0 means that all frames seen are
+	   given full weight of 1.0 forever.
+
+       analyze_interlaced_flag
+	   When this is not 0 then idet will use the specified number of
+	   frames to determine if the interlaced flag is accurate, it will not
+	   count undetermined frames.  If the flag is found to be accurate it
+	   will be used without any further computations, if it is found to be
+	   inaccurate it will be cleared without any further computations.
+	   This allows inserting the idet filter as a low computational method
+	   to clean up the interlaced flag
+
+       Examples
+
+       Inspect the field order of the first 360 frames in a video, in verbose
+       detail:
+
+	       ffmpeg -i INPUT -filter:v idet,metadata=mode=print -frames:v 360 -an -f null -
+
+       The idet filter will add analysis metadata to each frame, which will
+       then be discarded. At the end, the filter will also print a final
+       report with statistics.
+
+   il
+       Deinterleave or interleave fields.
+
+       This filter allows one to process interlaced images fields without
+       deinterlacing them. Deinterleaving splits the input frame into 2 fields
+       (so called half pictures). Odd lines are moved to the top half of the
+       output image, even lines to the bottom half.  You can process (filter)
+       them independently and then re-interleave them.
+
+       The filter accepts the following options:
+
+       luma_mode, l
+       chroma_mode, c
+       alpha_mode, a
+	   Available values for luma_mode, chroma_mode and alpha_mode are:
+
+	   none
+	       Do nothing.
+
+	   deinterleave, d
+	       Deinterleave fields, placing one above the other.
+
+	   interleave, i
+	       Interleave fields. Reverse the effect of deinterleaving.
+
+	   Default value is "none".
+
+       luma_swap, ls
+       chroma_swap, cs
+       alpha_swap, as
+	   Swap luma/chroma/alpha fields. Exchange even & odd lines. Default
+	   value is 0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   inflate
+       Apply inflate effect to the video.
+
+       This filter replaces the pixel by the local(3x3) average by taking into
+       account only values higher than the pixel.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   interlace
+       Simple interlacing filter from progressive contents. This interleaves
+       upper (or lower) lines from odd frames with lower (or upper) lines from
+       even frames, halving the frame rate and preserving image height.
+
+		  Original	  Original	       New Frame
+		  Frame 'j'	 Frame 'j+1'		 (tff)
+		 ==========	 ===========	   ==================
+		   Line 0  -------------------->    Frame 'j' Line 0
+		   Line 1	   Line 1  ---->   Frame 'j+1' Line 1
+		   Line 2 --------------------->    Frame 'j' Line 2
+		   Line 3	   Line 3  ---->   Frame 'j+1' Line 3
+		    ... 	    ... 		  ...
+	       New Frame + 1 will be generated by Frame 'j+2' and Frame 'j+3' and so on
+
+       It accepts the following optional parameters:
+
+       scan
+	   This determines whether the interlaced frame is taken from the even
+	   (tff - default) or odd (bff) lines of the progressive frame.
+
+       lowpass
+	   Vertical lowpass filter to avoid twitter interlacing and reduce
+	   moire patterns.
+
+	   0, off
+	       Disable vertical lowpass filter
+
+	   1, linear
+	       Enable linear filter (default)
+
+	   2, complex
+	       Enable complex filter. This will slightly less reduce twitter
+	       and moire but better retain detail and subjective sharpness
+	       impression.
+
+   kerndeint
+       Deinterlace input video by applying Donald Graft's adaptive kernel
+       deinterling. Work on interlaced parts of a video to produce progressive
+       frames.
+
+       The description of the accepted parameters follows.
+
+       thresh
+	   Set the threshold which affects the filter's tolerance when
+	   determining if a pixel line must be processed. It must be an
+	   integer in the range [0,255] and defaults to 10. A value of 0 will
+	   result in applying the process on every pixels.
+
+       map Paint pixels exceeding the threshold value to white if set to 1.
+	   Default is 0.
+
+       order
+	   Set the fields order. Swap fields if set to 1, leave fields alone
+	   if 0. Default is 0.
+
+       sharp
+	   Enable additional sharpening if set to 1. Default is 0.
+
+       twoway
+	   Enable twoway sharpening if set to 1. Default is 0.
+
+       Examples
+
+       o   Apply default values:
+
+		   kerndeint=thresh=10:map=0:order=0:sharp=0:twoway=0
+
+       o   Enable additional sharpening:
+
+		   kerndeint=sharp=1
+
+       o   Paint processed pixels in white:
+
+		   kerndeint=map=1
+
+   kirsch
+       Apply kirsch operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lagfun
+       Slowly update darker pixels.
+
+       This filter makes short flashes of light appear longer.	This filter
+       accepts the following options:
+
+       decay
+	   Set factor for decaying. Default is .95. Allowed range is from 0 to
+	   1.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lenscorrection
+       Correct radial lens distortion
+
+       This filter can be used to correct for radial distortion as can result
+       from the use of wide angle lenses, and thereby re-rectify the image. To
+       find the right parameters one can use tools available for example as
+       part of opencv or simply trial-and-error.  To use opencv use the
+       calibration sample (under samples/cpp) from the opencv sources and
+       extract the k1 and k2 coefficients from the resulting matrix.
+
+       Note that effectively the same filter is available in the open-source
+       tools Krita and Digikam from the KDE project.
+
+       In contrast to the vignette filter, which can also be used to
+       compensate lens errors, this filter corrects the distortion of the
+       image, whereas vignette corrects the brightness distribution, so you
+       may want to use both filters together in certain cases, though you will
+       have to take care of ordering, i.e. whether vignetting should be
+       applied before or after lens correction.
+
+       Options
+
+       The filter accepts the following options:
+
+       cx  Relative x-coordinate of the focal point of the image, and thereby
+	   the center of the distortion. This value has a range [0,1] and is
+	   expressed as fractions of the image width. Default is 0.5.
+
+       cy  Relative y-coordinate of the focal point of the image, and thereby
+	   the center of the distortion. This value has a range [0,1] and is
+	   expressed as fractions of the image height. Default is 0.5.
+
+       k1  Coefficient of the quadratic correction term. This value has a
+	   range [-1,1]. 0 means no correction. Default is 0.
+
+       k2  Coefficient of the double quadratic correction term. This value has
+	   a range [-1,1].  0 means no correction. Default is 0.
+
+       i   Set interpolation type. Can be "nearest" or "bilinear".  Default is
+	   "nearest".
+
+       fc  Specify the color of the unmapped pixels. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+	   Default color is "black@0".
+
+       The formula that generates the correction is:
+
+       r_src = r_tgt * (1 + k1 * (r_tgt / r_0)^2 + k2 * (r_tgt / r_0)^4)
+
+       where r_0 is halve of the image diagonal and r_src and r_tgt are the
+       distances from the focal point in the source and target images,
+       respectively.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lensfun
+       Apply lens correction via the lensfun library
+       (<http://lensfun.sourceforge.net/>).
+
+       The "lensfun" filter requires the camera make, camera model, and lens
+       model to apply the lens correction. The filter will load the lensfun
+       database and query it to find the corresponding camera and lens entries
+       in the database. As long as these entries can be found with the given
+       options, the filter can perform corrections on frames. Note that
+       incomplete strings will result in the filter choosing the best match
+       with the given options, and the filter will output the chosen camera
+       and lens models (logged with level "info"). You must provide the make,
+       camera model, and lens model as they are required.
+
+       To obtain a list of available makes and models, leave out one or both
+       of "make" and "model" options. The filter will send the full list to
+       the log with level "INFO".  The first column is the make and the second
+       column is the model.  To obtain a list of available lenses, set any
+       values for make and model and leave out the "lens_model" option. The
+       filter will send the full list of lenses in the log with level "INFO".
+       The ffmpeg tool will exit after the list is printed.
+
+       The filter accepts the following options:
+
+       make
+	   The make of the camera (for example, "Canon"). This option is
+	   required.
+
+       model
+	   The model of the camera (for example, "Canon EOS 100D"). This
+	   option is required.
+
+       lens_model
+	   The model of the lens (for example, "Canon EF-S 18-55mm f/3.5-5.6
+	   IS STM"). This option is required.
+
+       db_path
+	   The full path to the lens database folder. If not set, the filter
+	   will attempt to load the database from the install path when the
+	   library was built. Default is unset.
+
+       mode
+	   The type of correction to apply. The following values are valid
+	   options:
+
+	   vignetting
+	       Enables fixing lens vignetting.
+
+	   geometry
+	       Enables fixing lens geometry. This is the default.
+
+	   subpixel
+	       Enables fixing chromatic aberrations.
+
+	   vig_geo
+	       Enables fixing lens vignetting and lens geometry.
+
+	   vig_subpixel
+	       Enables fixing lens vignetting and chromatic aberrations.
+
+	   distortion
+	       Enables fixing both lens geometry and chromatic aberrations.
+
+	   all Enables all possible corrections.
+
+       focal_length
+	   The focal length of the image/video (zoom; expected constant for
+	   video). For example, a 18--55mm lens has focal length range of
+	   [18--55], so a value in that range should be chosen when using that
+	   lens. Default 18.
+
+       aperture
+	   The aperture of the image/video (expected constant for video). Note
+	   that aperture is only used for vignetting correction. Default 3.5.
+
+       focus_distance
+	   The focus distance of the image/video (expected constant for
+	   video). Note that focus distance is only used for vignetting and
+	   only slightly affects the vignetting correction process. If
+	   unknown, leave it at the default value (which is 1000).
+
+       scale
+	   The scale factor which is applied after transformation. After
+	   correction the video is no longer necessarily rectangular. This
+	   parameter controls how much of the resulting image is visible. The
+	   value 0 means that a value will be chosen automatically such that
+	   there is little or no unmapped area in the output image. 1.0 means
+	   that no additional scaling is done. Lower values may result in more
+	   of the corrected image being visible, while higher values may avoid
+	   unmapped areas in the output.
+
+       target_geometry
+	   The target geometry of the output image/video. The following values
+	   are valid options:
+
+	   rectilinear (default)
+	   fisheye
+	   panoramic
+	   equirectangular
+	   fisheye_orthographic
+	   fisheye_stereographic
+	   fisheye_equisolid
+	   fisheye_thoby
+       reverse
+	   Apply the reverse of image correction (instead of correcting
+	   distortion, apply it).
+
+       interpolation
+	   The type of interpolation used when correcting distortion. The
+	   following values are valid options:
+
+	   nearest
+	   linear (default)
+	   lanczos
+
+       Examples
+
+       o   Apply lens correction with make "Canon", camera model "Canon EOS
+	   100D", and lens model "Canon EF-S 18-55mm f/3.5-5.6 IS STM" with
+	   focal length of "18" and aperture of "8.0".
+
+		   ffmpeg -i input.mov -vf lensfun=make=Canon:model="Canon EOS 100D":lens_model="Canon EF-S 18-55mm f/3.5-5.6 IS STM":focal_length=18:aperture=8 -c:v h264 -b:v 8000k output.mov
+
+       o   Apply the same as before, but only for the first 5 seconds of
+	   video.
+
+		   ffmpeg -i input.mov -vf lensfun=make=Canon:model="Canon EOS 100D":lens_model="Canon EF-S 18-55mm f/3.5-5.6 IS STM":focal_length=18:aperture=8:enable='lte(t\,5)' -c:v h264 -b:v 8000k output.mov
+
+   libplacebo
+       Flexible GPU-accelerated processing filter based on libplacebo
+       (<https://code.videolan.org/videolan/libplacebo>).
+
+       Options
+
+       The options for this filter are divided into the following sections:
+
+       Output mode
+
+       These options control the overall output mode. By default, libplacebo
+       will try to preserve the source colorimetry and size as best as it can,
+       but it will apply any embedded film grain, dolby vision metadata or
+       anamorphic SAR present in source frames.
+
+       inputs
+	   Set the number of inputs. This can be used, alongside the "idx"
+	   variable, to allow placing/blending multiple inputs inside the
+	   output frame. This effectively enables functionality similar to
+	   hstack, overlay, etc.
+
+       w
+       h   Set the output video dimension expression. Default values are "iw"
+	   and "ih".
+
+	   Allows for the same expressions as the scale filter.
+
+       crop_x
+       crop_y
+	   Set the input crop x/y expressions, default values are "(iw-cw)/2"
+	   and "(ih-ch)/2".
+
+       crop_w
+       crop_h
+	   Set the input crop width/height expressions, default values are
+	   "iw" and "ih".
+
+       pos_x
+       pos_y
+	   Set the output placement x/y expressions, default values are
+	   "(ow-pw)/2" and "(oh-ph)/2".
+
+       pos_w
+       pos_h
+	   Set the output placement width/height expressions, default values
+	   are "ow" and "oh".
+
+       fps Set the output frame rate. This can be rational, e.g. "60000/1001".
+	   If set to the special string "none" (the default), input timestamps
+	   will instead be passed through to the output unmodified. Otherwise,
+	   the input video frames will be interpolated as necessary to rescale
+	   the video to the specified target framerate, in a manner as
+	   determined by the frame_mixer option.
+
+       format
+	   Set the output format override. If unset (the default), frames will
+	   be output in the same format as the respective input frames.
+	   Otherwise, format conversion will be performed.
+
+       force_original_aspect_ratio
+       force_divisible_by
+	   Work the same as the identical scale filter options.
+
+       normalize_sar
+	   If enabled, output frames will always have a pixel aspect ratio of
+	   1:1. This will introduce additional padding/cropping as necessary.
+	   If disabled (the default), any aspect ratio mismatches, including
+	   those from e.g. anamorphic video sources, are forwarded to the
+	   output pixel aspect ratio.
+
+       pad_crop_ratio
+	   Specifies a ratio (between 0.0 and 1.0) between padding and
+	   cropping when the input aspect ratio does not match the output
+	   aspect ratio and normalize_sar is in effect. The default of 0.0
+	   always pads the content with black borders, while a value of 1.0
+	   always crops off parts of the content. Intermediate values are
+	   possible, leading to a mix of the two approaches.
+
+       fillcolor
+	   Set the color used to fill the output area not covered by the
+	   output image, for example as a result of normalize_sar. For the
+	   general syntax of this option, check the "Color" section in the
+	   ffmpeg-utils manual. Defaults to "black".
+
+       corner_rounding
+	   Render frames with rounded corners. The value, given as a float
+	   ranging from 0.0 to 1.0, indicates the relative degree of rounding,
+	   from fully square to fully circular. In other words, it gives the
+	   radius divided by half the smaller side length. Defaults to 0.0.
+
+       extra_opts
+	   Pass extra libplacebo internal configuration options. These can be
+	   specified as a list of key=value pairs separated by ':'. The
+	   following example shows how to configure a custom filter kernel
+	   ("EWA LanczosSharp") and use it to double the input image
+	   resolution:
+
+		   -vf "libplacebo=w=iw*2:h=ih*2:extra_opts='upscaler=custom\:upscaler_preset=ewa_lanczos\:upscaler_blur=0.9812505644269356'"
+
+       colorspace
+       color_primaries
+       color_trc
+       range
+	   Configure the colorspace that output frames will be delivered in.
+	   The default value of "auto" outputs frames in the same format as
+	   the input frames, leading to no change. For any other value,
+	   conversion will be performed.
+
+	   See the setparams filter for a list of possible values.
+
+       apply_filmgrain
+	   Apply film grain (e.g. AV1 or H.274) if present in source frames,
+	   and strip it from the output. Enabled by default.
+
+       apply_dolbyvision
+	   Apply Dolby Vision RPU metadata if present in source frames, and
+	   strip it from the output. Enabled by default. Note that Dolby
+	   Vision will always output BT.2020+PQ, overriding the usual input
+	   frame metadata. These will also be picked as the values of "auto"
+	   for the respective frame output options.
+
+       In addition to the expression constants documented for the scale
+       filter, the crop_w, crop_h, crop_x, crop_y, pos_w, pos_h, pos_x and
+       pos_y options can also contain the following constants:
+
+       in_idx, idx
+	   The (0-based) numeric index of the currently active input stream.
+
+       crop_w, cw
+       crop_h, ch
+	   The computed values of crop_w and crop_h.
+
+       pos_w, pw
+       pos_h, ph
+	   The computed values of pos_w and pos_h.
+
+       in_t, t
+	   The input frame timestamp, in seconds. NAN if input timestamp is
+	   unknown.
+
+       out_t, ot
+	   The input frame timestamp, in seconds. NAN if input timestamp is
+	   unknown.
+
+       n   The input frame number, starting with 0.
+
+       Scaling
+
+       The options in this section control how libplacebo performs upscaling
+       and (if necessary) downscaling. Note that libplacebo will always
+       internally operate on 4:4:4 content, so any sub-sampled chroma formats
+       such as "yuv420p" will necessarily be upsampled and downsampled as part
+       of the rendering process. That means scaling might be in effect even if
+       the source and destination resolution are the same.
+
+       upscaler
+       downscaler
+	   Configure the filter kernel used for upscaling and downscaling. The
+	   respective defaults are "spline36" and "mitchell". For a full list
+	   of possible values, pass "help" to these options. The most
+	   important values are:
+
+	   none
+	       Forces the use of built-in GPU texture sampling (typically
+	       bilinear). Extremely fast but poor quality, especially when
+	       downscaling.
+
+	   bilinear
+	       Bilinear interpolation. Can generally be done for free on GPUs,
+	       except when doing so would lead to aliasing. Fast and low
+	       quality.
+
+	   nearest
+	       Nearest-neighbour interpolation. Sharp but highly aliasing.
+
+	   oversample
+	       Algorithm that looks visually similar to nearest-neighbour
+	       interpolation but tries to preserve pixel aspect ratio. Good
+	       for pixel art, since it results in minimal distortion of the
+	       artistic appearance.
+
+	   lanczos
+	       Standard sinc-sinc interpolation kernel.
+
+	   spline36
+	       Cubic spline approximation of lanczos. No difference in
+	       performance, but has very slightly less ringing.
+
+	   ewa_lanczos
+	       Elliptically weighted average version of lanczos, based on a
+	       jinc-sinc kernel.  This is also popularly referred to as just
+	       "Jinc scaling". Slow but very high quality.
+
+	   gaussian
+	       Gaussian kernel. Has certain ideal mathematical properties, but
+	       subjectively very blurry.
+
+	   mitchell
+	       Cubic BC spline with parameters recommended by Mitchell and
+	       Netravali. Very little ringing.
+
+       frame_mixer
+	   Controls the kernel used for mixing frames temporally. The default
+	   value is "none", which disables frame mixing. For a full list of
+	   possible values, pass "help" to this option. The most important
+	   values are:
+
+	   none
+	       Disables frame mixing, giving a result equivalent to "nearest
+	       neighbour" semantics.
+
+	   oversample
+	       Oversamples the input video to create a "Smooth Motion"-type
+	       effect: if an output frame would exactly fall on the transition
+	       between two video frames, it is blended according to the
+	       relative overlap. This is the recommended option whenever
+	       preserving the original subjective appearance is desired.
+
+	   mitchell_clamp
+	       Larger filter kernel that smoothly interpolates multiple frames
+	       in a manner designed to eliminate ringing and other artefacts
+	       as much as possible. This is the recommended option wherever
+	       maximum visual smoothness is desired.
+
+	   linear
+	       Linear blend/fade between frames. Especially useful for
+	       constructing e.g.  slideshows.
+
+       lut_entries
+	   Configures the size of scaler LUTs, ranging from 1 to 256. The
+	   default of 0 will pick libplacebo's internal default, typically 64.
+
+       antiringing
+	   Enables anti-ringing (for non-EWA filters). The value (between 0.0
+	   and 1.0) configures the strength of the anti-ringing algorithm. May
+	   increase aliasing if set too high. Disabled by default.
+
+       sigmoid
+	   Enable sigmoidal compression during upscaling. Reduces ringing
+	   slightly.  Enabled by default.
+
+       Debanding
+
+       Libplacebo comes with a built-in debanding filter that is good at
+       counteracting many common sources of banding and blocking. Turning this
+       on is highly recommended whenever quality is desired.
+
+       deband
+	   Enable (fast) debanding algorithm. Disabled by default.
+
+       deband_iterations
+	   Number of deband iterations of the debanding algorithm. Each
+	   iteration is performed with progressively increased radius (and
+	   diminished threshold).  Recommended values are in the range 1 to 4.
+	   Defaults to 1.
+
+       deband_threshold
+	   Debanding filter strength. Higher numbers lead to more aggressive
+	   debanding.  Defaults to 4.0.
+
+       deband_radius
+	   Debanding filter radius. A higher radius is better for slow
+	   gradients, while a lower radius is better for steep gradients.
+	   Defaults to 16.0.
+
+       deband_grain
+	   Amount of extra output grain to add. Helps hide imperfections.
+	   Defaults to 6.0.
+
+       Color adjustment
+
+       A collection of subjective color controls. Not very rigorous, so the
+       exact effect will vary somewhat depending on the input primaries and
+       colorspace.
+
+       brightness
+	   Brightness boost, between "-1.0" and 1.0. Defaults to 0.0.
+
+       contrast
+	   Contrast gain, between 0.0 and 16.0. Defaults to 1.0.
+
+       saturation
+	   Saturation gain, between 0.0 and 16.0. Defaults to 1.0.
+
+       hue Hue shift in radians, between "-3.14" and 3.14. Defaults to 0.0.
+	   This will rotate the UV subvector, defaulting to BT.709
+	   coefficients for RGB inputs.
+
+       gamma
+	   Gamma adjustment, between 0.0 and 16.0. Defaults to 1.0.
+
+       cones
+	   Cone model to use for color blindness simulation. Accepts any
+	   combination of "l", "m" and "s". Here are some examples:
+
+	   m   Deuteranomaly / deuteranopia (affecting 3%-4% of the
+	       population)
+
+	   l   Protanomaly / protanopia (affecting 1%-2% of the population)
+
+	   l+m Monochromacy (very rare)
+
+	   l+m+s
+	       Achromatopsy (complete loss of daytime vision, extremely rare)
+
+       cone-strength
+	   Gain factor for the cones specified by "cones", between 0.0 and
+	   10.0. A value of 1.0 results in no change to color vision. A value
+	   of 0.0 (the default) simulates complete loss of those cones. Values
+	   above 1.0 result in exaggerating the differences between cones,
+	   which may help compensate for reduced color vision.
+
+       Peak detection
+
+       To help deal with sources that only have static HDR10 metadata (or no
+       tagging whatsoever), libplacebo uses its own internal frame analysis
+       compute shader to analyze source frames and adapt the tone mapping
+       function in realtime. If this is too slow, or if exactly reproducible
+       frame-perfect results are needed, it's recommended to turn this feature
+       off.
+
+       peak_detect
+	   Enable HDR peak detection. Ignores static MaxCLL/MaxFALL values in
+	   favor of dynamic detection from the input. Note that the detected
+	   values do not get written back to the output frames, they merely
+	   guide the internal tone mapping process. Enabled by default.
+
+       smoothing_period
+	   Peak detection smoothing period, between 0.0 and 1000.0. Higher
+	   values result in peak detection becoming less responsive to changes
+	   in the input. Defaults to 100.0.
+
+       minimum_peak
+	   Lower bound on the detected peak (relative to SDR white), between
+	   0.0 and 100.0. Defaults to 1.0.
+
+       scene_threshold_low
+       scene_threshold_high
+	   Lower and upper thresholds for scene change detection. Expressed in
+	   a logarithmic scale between 0.0 and 100.0. Default to 5.5 and 10.0,
+	   respectively. Setting either to a negative value disables this
+	   functionality.
+
+       percentile
+	   Which percentile of the frame brightness histogram to use as the
+	   source peak for tone-mapping. Defaults to 99.995, a fairly
+	   conservative value.	Setting this to 100.0 disables frame histogram
+	   measurement and instead uses the true peak brightness for tone-
+	   mapping.
+
+       Tone mapping
+
+       The options in this section control how libplacebo performs tone-
+       mapping and gamut-mapping when dealing with mismatches between wide-
+       gamut or HDR content.  In general, libplacebo relies on accurate source
+       tagging and mastering display gamut information to produce the best
+       results.
+
+       gamut_mode
+	   How to handle out-of-gamut colors that can occur as a result of
+	   colorimetric gamut mapping.
+
+	   clip
+	       Do nothing, simply clip out-of-range colors to the RGB volume.
+	       Low quality but extremely fast.
+
+	   perceptual
+	       Perceptually soft-clip colors to the gamut volume. This is the
+	       default.
+
+	   relative
+	       Relative colorimetric hard-clip. Similar to "perceptual" but
+	       without the soft knee.
+
+	   saturation
+	       Saturation mapping, maps primaries directly to primaries in RGB
+	       space.  Not recommended except for artificial computer graphics
+	       for which a bright, saturated display is desired.
+
+	   absolute
+	       Absolute colorimetric hard-clip. Performs no adjustment of the
+	       white point.
+
+	   desaturate
+	       Hard-desaturates out-of-gamut colors towards white, while
+	       preserving the luminance. Has a tendency to distort the visual
+	       appearance of bright objects.
+
+	   darken
+	       Linearly reduces content brightness to preserves saturated
+	       details, followed by clipping the remaining out-of-gamut
+	       colors.
+
+	   warn
+	       Highlight out-of-gamut pixels (by inverting/marking them).
+
+	   linear
+	       Linearly reduces chromaticity of the entire image to make it
+	       fit within the target color volume. Be careful when using this
+	       on BT.2020 sources without proper mastering metadata, as doing
+	       so will lead to excessive desaturation.
+
+       tonemapping
+	   Tone-mapping algorithm to use. Available values are:
+
+	   auto
+	       Automatic selection based on internal heuristics. This is the
+	       default.
+
+	   clip
+	       Performs no tone-mapping, just clips out-of-range colors.
+	       Retains perfect color accuracy for in-range colors but
+	       completely destroys out-of-range information.  Does not perform
+	       any black point adaptation. Not configurable.
+
+	   st2094-40
+	       EETF from SMPTE ST 2094-40 Annex B, which applies the Bezier
+	       curves from HDR10+ dynamic metadata based on Bezier curves to
+	       perform tone-mapping. The OOTF used is adjusted based on the
+	       ratio between the targeted and actual display peak luminances.
+
+	   st2094-10
+	       EETF from SMPTE ST 2094-10 Annex B.2, which takes into account
+	       the input signal average luminance in addition to the
+	       maximum/minimum. The configurable contrast parameter influences
+	       the slope of the linear output segment, defaulting to 1.0 for
+	       no increase/decrease in contrast. Note that this does not
+	       currently include the subjective gain/offset/gamma controls
+	       defined in Annex B.3.
+
+	   bt.2390
+	       EETF from the ITU-R Report BT.2390, a hermite spline roll-off
+	       with linear segment. The knee point offset is configurable.
+	       Note that this parameter defaults to 1.0, rather than the value
+	       of 0.5 from the ITU-R spec.
+
+	   bt.2446a
+	       EETF from ITU-R Report BT.2446, method A. Designed for well-
+	       mastered HDR sources. Can be used for both forward and inverse
+	       tone mapping. Not configurable.
+
+	   spline
+	       Simple spline consisting of two polynomials, joined by a single
+	       pivot point.  The parameter gives the pivot point (in PQ
+	       space), defaulting to 0.30.  Can be used for both forward and
+	       inverse tone mapping.
+
+	   reinhard
+	       Simple non-linear, global tone mapping algorithm. The parameter
+	       specifies the local contrast coefficient at the display peak.
+	       Essentially, a parameter of 0.5 implies that the reference
+	       white will be about half as bright as when clipping. Defaults
+	       to 0.5, which results in the simplest formulation of this
+	       function.
+
+	   mobius
+	       Generalization of the reinhard tone mapping algorithm to
+	       support an additional linear slope near black. The tone mapping
+	       parameter indicates the trade-off between the linear section
+	       and the non-linear section. Essentially, for a given parameter
+	       x, every color value below x will be mapped linearly, while
+	       higher values get non-linearly tone-mapped. Values near 1.0
+	       make this curve behave like "clip", while values near 0.0 make
+	       this curve behave like "reinhard". The default value is 0.3,
+	       which provides a good balance between colorimetric accuracy and
+	       preserving out-of-gamut details.
+
+	   hable
+	       Piece-wise, filmic tone-mapping algorithm developed by John
+	       Hable for use in Uncharted 2, inspired by a similar tone-
+	       mapping algorithm used by Kodak.  Popularized by its use in
+	       video games with HDR rendering. Preserves both dark and bright
+	       details very well, but comes with the drawback of changing the
+	       average brightness quite significantly. This is sort of similar
+	       to "reinhard" with parameter 0.24.
+
+	   gamma
+	       Fits a gamma (power) function to transfer between the source
+	       and target color spaces, effectively resulting in a perceptual
+	       hard-knee joining two roughly linear sections. This preserves
+	       details at all scales fairly accurately, but can result in an
+	       image with a muted or dull appearance. The parameter is used as
+	       the cutoff point, defaulting to 0.5.
+
+	   linear
+	       Linearly stretches the input range to the output range, in PQ
+	       space. This will preserve all details accurately, but results
+	       in a significantly different average brightness. Can be used
+	       for inverse tone-mapping in addition to regular tone-mapping.
+	       The parameter can be used as an additional linear gain
+	       coefficient (defaulting to 1.0).
+
+       tonemapping_param
+	   For tunable tone mapping functions, this parameter can be used to
+	   fine-tune the curve behavior. Refer to the documentation of
+	   "tonemapping". The default value of 0.0 is replaced by the curve's
+	   preferred default setting.
+
+       inverse_tonemapping
+	   If enabled, this filter will also attempt stretching SDR signals to
+	   fill HDR output color volumes. Disabled by default.
+
+       tonemapping_lut_size
+	   Size of the tone-mapping LUT, between 2 and 1024. Defaults to 256.
+	   Note that this figure is squared when combined with "peak_detect".
+
+       contrast_recovery
+	   Contrast recovery strength. If set to a value above 0.0, the source
+	   image will be divided into high-frequency and low-frequency
+	   components, and a portion of the high-frequency image is added back
+	   onto the tone-mapped output.  May cause excessive ringing artifacts
+	   for some HDR sources, but can improve the subjective sharpness and
+	   detail left over in the image after tone-mapping.  Defaults to
+	   0.30.
+
+       contrast_smoothness
+	   Contrast recovery lowpass kernel size. Defaults to 3.5. Increasing
+	   or decreasing this will affect the visual appearance substantially.
+	   Has no effect when "contrast_recovery" is disabled.
+
+       Dithering
+
+       By default, libplacebo will dither whenever necessary, which includes
+       rendering to any integer format below 16-bit precision. It's
+       recommended to always leave this on, since not doing so may result in
+       visible banding in the output, even if the "debanding" filter is
+       enabled. If maximum performance is needed, use "ordered_fixed" instead
+       of disabling dithering.
+
+       dithering
+	   Dithering method to use. Accepts the following values:
+
+	   none
+	       Disables dithering completely. May result in visible banding.
+
+	   blue
+	       Dither with pseudo-blue noise. This is the default.
+
+	   ordered
+	       Tunable ordered dither pattern.
+
+	   ordered_fixed
+	       Faster ordered dither with a fixed size of 6. Texture-less.
+
+	   white
+	       Dither with white noise. Texture-less.
+
+       dither_lut_size
+	   Dither LUT size, as log base2 between 1 and 8. Defaults to 6,
+	   corresponding to a LUT size of "64x64".
+
+       dither_temporal
+	   Enables temporal dithering. Disabled by default.
+
+       Custom shaders
+
+       libplacebo supports a number of custom shaders based on the mpv .hook
+       GLSL syntax. A collection of such shaders can be found here:
+       <https://github.com/mpv-player/mpv/wiki/User-Scripts#user-shaders>
+
+       A full description of the mpv shader format is beyond the scope of this
+       section, but a summary can be found here:
+       <https://mpv.io/manual/master/#options-glsl-shader>
+
+       custom_shader_path
+	   Specifies a path to a custom shader file to load at runtime.
+
+       custom_shader_bin
+	   Specifies a complete custom shader as a raw string.
+
+       Debugging / performance
+
+       All of the options in this section default off. They may be of
+       assistance when attempting to squeeze the maximum performance at the
+       cost of quality.
+
+       skip_aa
+	   Disable anti-aliasing when downscaling.
+
+       polar_cutoff
+	   Truncate polar (EWA) scaler kernels below this absolute magnitude,
+	   between 0.0 and 1.0.
+
+       disable_linear
+	   Disable linear light scaling.
+
+       disable_builtin
+	   Disable built-in GPU sampling (forces LUT).
+
+       disable_fbos
+	   Forcibly disable FBOs, resulting in loss of almost all
+	   functionality, but offering the maximum possible speed.
+
+       Commands
+
+       This filter supports almost all of the above options as commands.
+
+       Examples
+
+       o   Tone-map input to standard gamut BT.709 output:
+
+		   libplacebo=colorspace=bt709:color_primaries=bt709:color_trc=bt709:range=tv
+
+       o   Rescale input to fit into standard 1080p, with high quality
+	   scaling:
+
+		   libplacebo=w=1920:h=1080:force_original_aspect_ratio=decrease:normalize_sar=true:upscaler=ewa_lanczos:downscaler=ewa_lanczos
+
+       o   Interpolate low FPS / VFR input to smoothed constant 60 fps output:
+
+		   libplacebo=fps=60:frame_mixer=mitchell_clamp
+
+       o   Convert input to standard sRGB JPEG:
+
+		   libplacebo=format=yuv420p:colorspace=bt470bg:color_primaries=bt709:color_trc=iec61966-2-1:range=pc
+
+       o   Use higher quality debanding settings:
+
+		   libplacebo=deband=true:deband_iterations=3:deband_radius=8:deband_threshold=6
+
+       o   Run this filter on the CPU, on systems with Mesa installed (and
+	   with the most expensive options disabled):
+
+		   ffmpeg ... -init_hw_device vulkan:llvmpipe ... -vf libplacebo=upscaler=none:downscaler=none:peak_detect=false
+
+       o   Suppress CPU-based AV1/H.274 film grain application in the decoder,
+	   in favor of doing it with this filter. Note that this is only a
+	   gain if the frames are either already on the GPU, or if you're
+	   using libplacebo for other purposes, since otherwise the VRAM
+	   roundtrip will more than offset any expected speedup.
+
+		   ffmpeg -export_side_data +film_grain ... -vf libplacebo=apply_filmgrain=true
+
+       o   Interop with VAAPI hwdec to avoid round-tripping through RAM:
+
+		   ffmpeg -init_hw_device vulkan -hwaccel vaapi -hwaccel_output_format vaapi ... -vf libplacebo
+
+   libvmaf
+       Calculate the VMAF (Video Multi-Method Assessment Fusion) score for a
+       reference/distorted pair of input videos.
+
+       The first input is the distorted video, and the second input is the
+       reference video.
+
+       The obtained VMAF score is printed through the logging system.
+
+       It requires Netflix's vmaf library (libvmaf) as a pre-requisite.  After
+       installing the library it can be enabled using: "./configure
+       --enable-libvmaf".
+
+       The filter has following options:
+
+       model
+	   A `|` delimited list of vmaf models. Each model can be configured
+	   with a number of parameters.  Default value: "version=vmaf_v0.6.1"
+
+       feature
+	   A `|` delimited list of features. Each feature can be configured
+	   with a number of parameters.
+
+       log_path
+	   Set the file path to be used to store log files.
+
+       log_fmt
+	   Set the format of the log file (xml, json, csv, or sub).
+
+       pool
+	   Set the pool method to be used for computing vmaf.  Options are
+	   "min", "harmonic_mean" or "mean" (default).
+
+       n_threads
+	   Set number of threads to be used when initializing libvmaf.
+	   Default value: 0, no threads.
+
+       n_subsample
+	   Set frame subsampling interval to be used.
+
+       This filter also supports the framesync options.
+
+       Examples
+
+       o   In the examples below, a distorted video distorted.mpg is compared
+	   with a reference file reference.mpg.
+
+       o   Basic usage:
+
+		   ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf=log_path=output.xml -f null -
+
+       o   Example with multiple models:
+
+		   ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf='model=version=vmaf_v0.6.1\\:name=vmaf|version=vmaf_v0.6.1neg\\:name=vmaf_neg' -f null -
+
+       o   Example with multiple additional features:
+
+		   ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf='feature=name=psnr|name=ciede' -f null -
+
+       o   Example with options and different containers:
+
+		   ffmpeg -i distorted.mpg -i reference.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]libvmaf=log_fmt=json:log_path=output.json" -f null -
+
+   libvmaf_cuda
+       This is the CUDA variant of the libvmaf filter. It only accepts CUDA
+       frames.
+
+       It requires Netflix's vmaf library (libvmaf) as a pre-requisite.  After
+       installing the library it can be enabled using: "./configure
+       --enable-nonfree --enable-ffnvcodec --enable-libvmaf".
+
+       Examples
+
+       o   Basic usage showing CUVID hardware decoding and CUDA scaling with
+	   scale_cuda:
+
+		   ffmpeg \
+		       -hwaccel cuda -hwaccel_output_format cuda -codec:v av1_cuvid -i dis.obu \
+		       -hwaccel cuda -hwaccel_output_format cuda -codec:v av1_cuvid -i ref.obu \
+		       -filter_complex "
+			   [0:v]scale_cuda=format=yuv420p[ref]; \
+			   [1:v]scale_cuda=format=yuv420p[dis]; \
+			   [dis][ref]libvmaf_cuda=log_fmt=json:log_path=output.json
+		       " \
+		       -f null -
+
+   limitdiff
+       Apply limited difference filter using second and optionally third video
+       stream.
+
+       The filter accepts the following options:
+
+       threshold
+	   Set the threshold to use when allowing certain differences between
+	   video streams.  Any absolute difference value lower or exact than
+	   this threshold will pick pixel components from first video stream.
+
+       elasticity
+	   Set the elasticity of soft thresholding when processing video
+	   streams.  This value multiplied with first one sets second
+	   threshold.  Any absolute difference value greater or exact than
+	   second threshold will pick pixel components from second video
+	   stream. For values between those two threshold linear interpolation
+	   between first and second video stream will be used.
+
+       reference
+	   Enable the reference (third) video stream processing. By default is
+	   disabled.  If set, this video stream will be used for calculating
+	   absolute difference with first video stream.
+
+       planes
+	   Specify which planes will be processed. Defaults to all available.
+
+       Commands
+
+       This filter supports the all above options as commands except option
+       reference.
+
+   limiter
+       Limits the pixel components values to the specified range [min, max].
+
+       The filter accepts the following options:
+
+       min Lower bound. Defaults to the lowest allowed value for the input.
+
+       max Upper bound. Defaults to the highest allowed value for the input.
+
+       planes
+	   Specify which planes will be processed. Defaults to all available.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   loop
+       Loop video frames.
+
+       The filter accepts the following options:
+
+       loop
+	   Set the number of loops. Setting this value to -1 will result in
+	   infinite loops.  Default is 0.
+
+       size
+	   Set maximal size in number of frames. Default is 0.
+
+       start
+	   Set first frame of loop. Default is 0.
+
+       time
+	   Set the time of loop start in seconds.  Only used if option named
+	   start is set to "-1".
+
+       Examples
+
+       o   Loop single first frame infinitely:
+
+		   loop=loop=-1:size=1:start=0
+
+       o   Loop single first frame 10 times:
+
+		   loop=loop=10:size=1:start=0
+
+       o   Loop 10 first frames 5 times:
+
+		   loop=loop=5:size=10:start=0
+
+   lut1d
+       Apply a 1D LUT to an input video.
+
+       The filter accepts the following options:
+
+       file
+	   Set the 1D LUT file name.
+
+	   Currently supported formats:
+
+	   cube
+	       Iridas
+
+	   csp cineSpace
+
+       interp
+	   Select interpolation mode.
+
+	   Available values are:
+
+	   nearest
+	       Use values from the nearest defined point.
+
+	   linear
+	       Interpolate values using the linear interpolation.
+
+	   cosine
+	       Interpolate values using the cosine interpolation.
+
+	   cubic
+	       Interpolate values using the cubic interpolation.
+
+	   spline
+	       Interpolate values using the spline interpolation.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lut3d
+       Apply a 3D LUT to an input video.
+
+       The filter accepts the following options:
+
+       file
+	   Set the 3D LUT file name.
+
+	   Currently supported formats:
+
+	   3dl AfterEffects
+
+	   cube
+	       Iridas
+
+	   dat DaVinci
+
+	   m3d Pandora
+
+	   csp cineSpace
+
+       interp
+	   Select interpolation mode.
+
+	   Available values are:
+
+	   nearest
+	       Use values from the nearest defined point.
+
+	   trilinear
+	       Interpolate values using the 8 points defining a cube.
+
+	   tetrahedral
+	       Interpolate values using a tetrahedron.
+
+	   pyramid
+	       Interpolate values using a pyramid.
+
+	   prism
+	       Interpolate values using a prism.
+
+       Commands
+
+       This filter supports the "interp" option as commands.
+
+   lumakey
+       Turn certain luma values into transparency.
+
+       The filter accepts the following options:
+
+       threshold
+	   Set the luma which will be used as base for transparency.  Default
+	   value is 0.
+
+       tolerance
+	   Set the range of luma values to be keyed out.  Default value is
+	   0.01.
+
+       softness
+	   Set the range of softness. Default value is 0.  Use this to control
+	   gradual transition from zero to full transparency.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   lut, lutrgb, lutyuv
+       Compute a look-up table for binding each pixel component input value to
+       an output value, and apply it to the input video.
+
+       lutyuv applies a lookup table to a YUV input video, lutrgb to an RGB
+       input video.
+
+       These filters accept the following parameters:
+
+       c0  set first pixel component expression
+
+       c1  set second pixel component expression
+
+       c2  set third pixel component expression
+
+       c3  set fourth pixel component expression, corresponds to the alpha
+	   component
+
+       r   set red component expression
+
+       g   set green component expression
+
+       b   set blue component expression
+
+       a   alpha component expression
+
+       y   set Y/luma component expression
+
+       u   set U/Cb component expression
+
+       v   set V/Cr component expression
+
+       Each of them specifies the expression to use for computing the lookup
+       table for the corresponding pixel component values.
+
+       The exact component associated to each of the c* options depends on the
+       format in input.
+
+       The lut filter requires either YUV or RGB pixel formats in input,
+       lutrgb requires RGB pixel formats in input, and lutyuv requires YUV.
+
+       The expressions can contain the following constants and functions:
+
+       w
+       h   The input width and height.
+
+       val The input value for the pixel component.
+
+       clipval
+	   The input value, clipped to the minval-maxval range.
+
+       maxval
+	   The maximum value for the pixel component.
+
+       minval
+	   The minimum value for the pixel component.
+
+       negval
+	   The negated value for the pixel component value, clipped to the
+	   minval-maxval range; it corresponds to the expression
+	   "maxval-clipval+minval".
+
+       clip(val)
+	   The computed value in val, clipped to the minval-maxval range.
+
+       gammaval(gamma)
+	   The computed gamma correction value of the pixel component value,
+	   clipped to the minval-maxval range. It corresponds to the
+	   expression
+	   "pow((clipval-minval)/(maxval-minval)\,gamma)*(maxval-minval)+minval"
+
+       All expressions default to "clipval".
+
+       Commands
+
+       This filter supports same commands as options.
+
+       Examples
+
+       o   Negate input video:
+
+		   lutrgb="r=maxval+minval-val:g=maxval+minval-val:b=maxval+minval-val"
+		   lutyuv="y=maxval+minval-val:u=maxval+minval-val:v=maxval+minval-val"
+
+	   The above is the same as:
+
+		   lutrgb="r=negval:g=negval:b=negval"
+		   lutyuv="y=negval:u=negval:v=negval"
+
+       o   Negate luma:
+
+		   lutyuv=y=negval
+
+       o   Remove chroma components, turning the video into a graytone image:
+
+		   lutyuv="u=128:v=128"
+
+       o   Apply a luma burning effect:
+
+		   lutyuv="y=2*val"
+
+       o   Remove green and blue components:
+
+		   lutrgb="g=0:b=0"
+
+       o   Set a constant alpha channel value on input:
+
+		   format=rgba,lutrgb=a="maxval-minval/2"
+
+       o   Correct luma gamma by a factor of 0.5:
+
+		   lutyuv=y=gammaval(0.5)
+
+       o   Discard least significant bits of luma:
+
+		   lutyuv=y='bitand(val, 128+64+32)'
+
+       o   Technicolor like effect:
+
+		   lutyuv=u='(val-maxval/2)*2+maxval/2':v='(val-maxval/2)*2+maxval/2'
+
+   lut2, tlut2
+       The "lut2" filter takes two input streams and outputs one stream.
+
+       The "tlut2" (time lut2) filter takes two consecutive frames from one
+       single stream.
+
+       This filter accepts the following parameters:
+
+       c0  set first pixel component expression
+
+       c1  set second pixel component expression
+
+       c2  set third pixel component expression
+
+       c3  set fourth pixel component expression, corresponds to the alpha
+	   component
+
+       d   set output bit depth, only available for "lut2" filter. By default
+	   is 0, which means bit depth is automatically picked from first
+	   input format.
+
+       The "lut2" filter also supports the framesync options.
+
+       Each of them specifies the expression to use for computing the lookup
+       table for the corresponding pixel component values.
+
+       The exact component associated to each of the c* options depends on the
+       format in inputs.
+
+       The expressions can contain the following constants:
+
+       w
+       h   The input width and height.
+
+       x   The first input value for the pixel component.
+
+       y   The second input value for the pixel component.
+
+       bdx The first input video bit depth.
+
+       bdy The second input video bit depth.
+
+       All expressions default to "x".
+
+       Commands
+
+       This filter supports the all above options as commands except option
+       "d".
+
+       Examples
+
+       o   Highlight differences between two RGB video streams:
+
+		   lut2='ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,0,pow(2,bdx)-1)'
+
+       o   Highlight differences between two YUV video streams:
+
+		   lut2='ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,pow(2,bdx-1),pow(2,bdx)-1):ifnot(x-y,pow(2,bdx-1),pow(2,bdx)-1)'
+
+       o   Show max difference between two video streams:
+
+		   lut2='if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1))):if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1))):if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1)))'
+
+   maskedclamp
+       Clamp the first input stream with the second input and third input
+       stream.
+
+       Returns the value of first stream to be between second input stream -
+       "undershoot" and third input stream + "overshoot".
+
+       This filter accepts the following options:
+
+       undershoot
+	   Default value is 0.
+
+       overshoot
+	   Default value is 0.
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedmax
+       Merge the second and third input stream into output stream using
+       absolute differences between second input stream and first input stream
+       and absolute difference between third input stream and first input
+       stream. The picked value will be from second input stream if second
+       absolute difference is greater than first one or from third input
+       stream otherwise.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedmerge
+       Merge the first input stream with the second input stream using per
+       pixel weights in the third input stream.
+
+       A value of 0 in the third stream pixel component means that pixel
+       component from first stream is returned unchanged, while maximum value
+       (eg. 255 for 8-bit videos) means that pixel component from second
+       stream is returned unchanged. Intermediate values define the amount of
+       merging between both input stream's pixel components.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedmin
+       Merge the second and third input stream into output stream using
+       absolute differences between second input stream and first input stream
+       and absolute difference between third input stream and first input
+       stream. The picked value will be from second input stream if second
+       absolute difference is less than first one or from third input stream
+       otherwise.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedthreshold
+       Pick pixels comparing absolute difference of two video streams with
+       fixed threshold.
+
+       If absolute difference between pixel component of first and second
+       video stream is equal or lower than user supplied threshold than pixel
+       component from first video stream is picked, otherwise pixel component
+       from second video stream is picked.
+
+       This filter accepts the following options:
+
+       threshold
+	   Set threshold used when picking pixels from absolute difference
+	   from two input video streams.
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from second stream.  By default value 0xf, all
+	   planes will be processed.
+
+       mode
+	   Set mode of filter operation. Can be "abs" or "diff".  Default is
+	   "abs".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskfun
+       Create mask from input video.
+
+       For example it is useful to create motion masks after "tblend" filter.
+
+       This filter accepts the following options:
+
+       low Set low threshold. Any pixel component lower or exact than this
+	   value will be set to 0.
+
+       high
+	   Set high threshold. Any pixel component higher than this value will
+	   be set to max value allowed for current pixel format.
+
+       planes
+	   Set planes to filter, by default all available planes are filtered.
+
+       fill
+	   Fill all frame pixels with this value.
+
+       sum Set max average pixel value for frame. If sum of all pixel
+	   components is higher that this average, output frame will be
+	   completely filled with value set by fill option.  Typically useful
+	   for scene changes when used in combination with "tblend" filter.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   mcdeint
+       Apply motion-compensation deinterlacing.
+
+       It needs one field per frame as input and must thus be used together
+       with yadif=1/3 or equivalent.
+
+       This filter accepts the following options:
+
+       mode
+	   Set the deinterlacing mode.
+
+	   It accepts one of the following values:
+
+	   fast
+	   medium
+	   slow
+	       use iterative motion estimation
+
+	   extra_slow
+	       like slow, but use multiple reference frames.
+
+	   Default value is fast.
+
+       parity
+	   Set the picture field parity assumed for the input video. It must
+	   be one of the following values:
+
+	   0, tff
+	       assume top field first
+
+	   1, bff
+	       assume bottom field first
+
+	   Default value is bff.
+
+       qp  Set per-block quantization parameter (QP) used by the internal
+	   encoder.
+
+	   Higher values should result in a smoother motion vector field but
+	   less optimal individual vectors. Default value is 1.
+
+   median
+       Pick median pixel from certain rectangle defined by radius.
+
+       This filter accepts the following options:
+
+       radius
+	   Set horizontal radius size. Default value is 1.  Allowed range is
+	   integer from 1 to 127.
+
+       planes
+	   Set which planes to process. Default is 15, which is all available
+	   planes.
+
+       radiusV
+	   Set vertical radius size. Default value is 0.  Allowed range is
+	   integer from 0 to 127.  If it is 0, value will be picked from
+	   horizontal "radius" option.
+
+       percentile
+	   Set median percentile. Default value is 0.5.  Default value of 0.5
+	   will pick always median values, while 0 will pick minimum values,
+	   and 1 maximum values.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   mergeplanes
+       Merge color channel components from several video streams.
+
+       The filter accepts up to 4 input streams, and merge selected input
+       planes to the output video.
+
+       This filter accepts the following options:
+
+       mapping
+	   Set input to output plane mapping. Default is 0.
+
+	   The mappings is specified as a bitmap. It should be specified as a
+	   hexadecimal number in the form 0xAa[Bb[Cc[Dd]]]. 'Aa' describes the
+	   mapping for the first plane of the output stream. 'A' sets the
+	   number of the input stream to use (from 0 to 3), and 'a' the plane
+	   number of the corresponding input to use (from 0 to 3). The rest of
+	   the mappings is similar, 'Bb' describes the mapping for the output
+	   stream second plane, 'Cc' describes the mapping for the output
+	   stream third plane and 'Dd' describes the mapping for the output
+	   stream fourth plane.
+
+       format
+	   Set output pixel format. Default is "yuva444p".
+
+       map0s
+       map1s
+       map2s
+       map3s
+	   Set input to output stream mapping for output Nth plane. Default is
+	   0.
+
+       map0p
+       map1p
+       map2p
+       map3p
+	   Set input to output plane mapping for output Nth plane. Default is
+	   0.
+
+       Examples
+
+       o   Merge three gray video streams of same width and height into single
+	   video stream:
+
+		   [a0][a1][a2]mergeplanes=0x001020:yuv444p
+
+       o   Merge 1st yuv444p stream and 2nd gray video stream into yuva444p
+	   video stream:
+
+		   [a0][a1]mergeplanes=0x00010210:yuva444p
+
+       o   Swap Y and A plane in yuva444p stream:
+
+		   format=yuva444p,mergeplanes=0x03010200:yuva444p
+
+       o   Swap U and V plane in yuv420p stream:
+
+		   format=yuv420p,mergeplanes=0x000201:yuv420p
+
+       o   Cast a rgb24 clip to yuv444p:
+
+		   format=rgb24,mergeplanes=0x000102:yuv444p
+
+   mestimate
+       Estimate and export motion vectors using block matching algorithms.
+       Motion vectors are stored in frame side data to be used by other
+       filters.
+
+       This filter accepts the following options:
+
+       method
+	   Specify the motion estimation method. Accepts one of the following
+	   values:
+
+	   esa Exhaustive search algorithm.
+
+	   tss Three step search algorithm.
+
+	   tdls
+	       Two dimensional logarithmic search algorithm.
+
+	   ntss
+	       New three step search algorithm.
+
+	   fss Four step search algorithm.
+
+	   ds  Diamond search algorithm.
+
+	   hexbs
+	       Hexagon-based search algorithm.
+
+	   epzs
+	       Enhanced predictive zonal search algorithm.
+
+	   umh Uneven multi-hexagon search algorithm.
+
+	   Default value is esa.
+
+       mb_size
+	   Macroblock size. Default 16.
+
+       search_param
+	   Search parameter. Default 7.
+
+   midequalizer
+       Apply Midway Image Equalization effect using two video streams.
+
+       Midway Image Equalization adjusts a pair of images to have the same
+       histogram, while maintaining their dynamics as much as possible. It's
+       useful for e.g. matching exposures from a pair of stereo cameras.
+
+       This filter has two inputs and one output, which must be of same pixel
+       format, but may be of different sizes. The output of filter is first
+       input adjusted with midway histogram of both inputs.
+
+       This filter accepts the following option:
+
+       planes
+	   Set which planes to process. Default is 15, which is all available
+	   planes.
+
+   minterpolate
+       Convert the video to specified frame rate using motion interpolation.
+
+       This filter accepts the following options:
+
+       fps Specify the output frame rate. This can be rational e.g.
+	   "60000/1001". Frames are dropped if fps is lower than source fps.
+	   Default 60.
+
+       mi_mode
+	   Motion interpolation mode. Following values are accepted:
+
+	   dup Duplicate previous or next frame for interpolating new ones.
+
+	   blend
+	       Blend source frames. Interpolated frame is mean of previous and
+	       next frames.
+
+	   mci Motion compensated interpolation. Following options are
+	       effective when this mode is selected:
+
+	       mc_mode
+		   Motion compensation mode. Following values are accepted:
+
+		   obmc
+		       Overlapped block motion compensation.
+
+		   aobmc
+		       Adaptive overlapped block motion compensation. Window
+		       weighting coefficients are controlled adaptively
+		       according to the reliabilities of the neighboring
+		       motion vectors to reduce oversmoothing.
+
+		   Default mode is obmc.
+
+	       me_mode
+		   Motion estimation mode. Following values are accepted:
+
+		   bidir
+		       Bidirectional motion estimation. Motion vectors are
+		       estimated for each source frame in both forward and
+		       backward directions.
+
+		   bilat
+		       Bilateral motion estimation. Motion vectors are
+		       estimated directly for interpolated frame.
+
+		   Default mode is bilat.
+
+	       me  The algorithm to be used for motion estimation. Following
+		   values are accepted:
+
+		   esa Exhaustive search algorithm.
+
+		   tss Three step search algorithm.
+
+		   tdls
+		       Two dimensional logarithmic search algorithm.
+
+		   ntss
+		       New three step search algorithm.
+
+		   fss Four step search algorithm.
+
+		   ds  Diamond search algorithm.
+
+		   hexbs
+		       Hexagon-based search algorithm.
+
+		   epzs
+		       Enhanced predictive zonal search algorithm.
+
+		   umh Uneven multi-hexagon search algorithm.
+
+		   Default algorithm is epzs.
+
+	       mb_size
+		   Macroblock size. Default 16.
+
+	       search_param
+		   Motion estimation search parameter. Default 32.
+
+	       vsbmc
+		   Enable variable-size block motion compensation. Motion
+		   estimation is applied with smaller block sizes at object
+		   boundaries in order to make them less blurry. Default is 0
+		   (disabled).
+
+       scd Scene change detection method. Scene change leads motion vectors to
+	   be in random direction. Scene change detection replace interpolated
+	   frames by duplicate ones. May not be needed for other modes.
+	   Following values are accepted:
+
+	   none
+	       Disable scene change detection.
+
+	   fdiff
+	       Frame difference. Corresponding pixel values are compared and
+	       if it satisfies scd_threshold scene change is detected.
+
+	   Default method is fdiff.
+
+       scd_threshold
+	   Scene change detection threshold. Default is 10..
+
+   mix
+       Mix several video input streams into one video stream.
+
+       A description of the accepted options follows.
+
+       inputs
+	   The number of inputs. If unspecified, it defaults to 2.
+
+       weights
+	   Specify weight of each input video stream as sequence.  Each weight
+	   is separated by space. If number of weights is smaller than number
+	   of frames last specified weight will be used for all remaining
+	   unset weights.
+
+       scale
+	   Specify scale, if it is set it will be multiplied with sum of each
+	   weight multiplied with pixel values to give final destination pixel
+	   value. By default scale is auto scaled to sum of weights.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       duration
+	   Specify how end of stream is determined.
+
+	   longest
+	       The duration of the longest input. (default)
+
+	   shortest
+	       The duration of the shortest input.
+
+	   first
+	       The duration of the first input.
+
+       Commands
+
+       This filter supports the following commands:
+
+       weights
+       scale
+       planes
+	   Syntax is same as option with same name.
+
+   monochrome
+       Convert video to gray using custom color filter.
+
+       A description of the accepted options follows.
+
+       cb  Set the chroma blue spot. Allowed range is from -1 to 1.  Default
+	   value is 0.
+
+       cr  Set the chroma red spot. Allowed range is from -1 to 1.  Default
+	   value is 0.
+
+       size
+	   Set the color filter size. Allowed range is from .1 to 10.  Default
+	   value is 1.
+
+       high
+	   Set the highlights strength. Allowed range is from 0 to 1.  Default
+	   value is 0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   morpho
+       This filter allows to apply main morphological grayscale transforms,
+       erode and dilate with arbitrary structures set in second input stream.
+
+       Unlike naive implementation and much slower performance in erosion and
+       dilation filters, when speed is critical "morpho" filter should be used
+       instead.
+
+       A description of accepted options follows,
+
+       mode
+	   Set morphological transform to apply, can be:
+
+	   erode
+	   dilate
+	   open
+	   close
+	   gradient
+	   tophat
+	   blackhat
+
+	   Default is "erode".
+
+       planes
+	   Set planes to filter, by default all planes except alpha are
+	   filtered.
+
+       structure
+	   Set which structure video frames will be processed from second
+	   input stream, can be first or all. Default is all.
+
+       The "morpho" filter also supports the framesync options.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   mpdecimate
+       Drop frames that do not differ greatly from the previous frame in order
+       to reduce frame rate.
+
+       The main use of this filter is for very-low-bitrate encoding (e.g.
+       streaming over dialup modem), but it could in theory be used for fixing
+       movies that were inverse-telecined incorrectly.
+
+       A description of the accepted options follows.
+
+       max Set the maximum number of consecutive frames which can be dropped
+	   (if positive), or the minimum interval between dropped frames (if
+	   negative). If the value is 0, the frame is dropped disregarding the
+	   number of previous sequentially dropped frames.
+
+	   Default value is 0.
+
+       keep
+	   Set the maximum number of consecutive similar frames to ignore
+	   before to start dropping them.  If the value is 0, the frame is
+	   dropped disregarding the number of previous sequentially similar
+	   frames.
+
+	   Default value is 0.
+
+       hi
+       lo
+       frac
+	   Set the dropping threshold values.
+
+	   Values for hi and lo are for 8x8 pixel blocks and represent actual
+	   pixel value differences, so a threshold of 64 corresponds to 1 unit
+	   of difference for each pixel, or the same spread out differently
+	   over the block.
+
+	   A frame is a candidate for dropping if no 8x8 blocks differ by more
+	   than a threshold of hi, and if no more than frac blocks (1 meaning
+	   the whole image) differ by more than a threshold of lo.
+
+	   Default value for hi is 64*12, default value for lo is 64*5, and
+	   default value for frac is 0.33.
+
+   msad
+       Obtain the MSAD (Mean Sum of Absolute Differences) between two input
+       videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained per component, average, min and max MSAD is printed
+       through the logging system.
+
+       The filter stores the calculated MSAD of each frame in frame metadata.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi msad -f null -
+
+   multiply
+       Multiply first video stream pixels values with second video stream
+       pixels values.
+
+       The filter accepts the following options:
+
+       scale
+	   Set the scale applied to second video stream. By default is 1.
+	   Allowed range is from 0 to 9.
+
+       offset
+	   Set the offset applied to second video stream. By default is 0.5.
+	   Allowed range is from "-1" to 1.
+
+       planes
+	   Specify planes from input video stream that will be processed.  By
+	   default all planes are processed.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   negate
+       Negate (invert) the input video.
+
+       It accepts the following option:
+
+       components
+	   Set components to negate.
+
+	   Available values for components are:
+
+	   y
+	   u
+	   v
+	   a
+	   r
+	   g
+	   b
+       negate_alpha
+	   With value 1, it negates the alpha component, if present. Default
+	   value is 0.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   nlmeans
+       Denoise frames using Non-Local Means algorithm.
+
+       Each pixel is adjusted by looking for other pixels with similar
+       contexts. This context similarity is defined by comparing their
+       surrounding patches of size pxp. Patches are searched in an area of rxr
+       around the pixel.
+
+       Note that the research area defines centers for patches, which means
+       some patches will be made of pixels outside that research area.
+
+       The filter accepts the following options.
+
+       s   Set denoising strength. Default is 1.0. Must be in range [1.0,
+	   30.0].
+
+       p   Set patch size. Default is 7. Must be odd number in range [0, 99].
+
+       pc  Same as p but for chroma planes.
+
+	   The default value is 0 and means automatic.
+
+       r   Set research size. Default is 15. Must be odd number in range [0,
+	   99].
+
+       rc  Same as r but for chroma planes.
+
+	   The default value is 0 and means automatic.
+
+   nnedi
+       Deinterlace video using neural network edge directed interpolation.
+
+       This filter accepts the following options:
+
+       weights
+	   Mandatory option, without binary file filter can not work.
+	   Currently file can be found here:
+	   https://github.com/dubhater/vapoursynth-nnedi3/blob/master/src/nnedi3_weights.bin
+
+       deint
+	   Set which frames to deinterlace, by default it is "all".  Can be
+	   "all" or "interlaced".
+
+       field
+	   Set mode of operation.
+
+	   Can be one of the following:
+
+	   af  Use frame flags, both fields.
+
+	   a   Use frame flags, single field.
+
+	   t   Use top field only.
+
+	   b   Use bottom field only.
+
+	   tf  Use both fields, top first.
+
+	   bf  Use both fields, bottom first.
+
+       planes
+	   Set which planes to process, by default filter process all frames.
+
+       nsize
+	   Set size of local neighborhood around each pixel, used by the
+	   predictor neural network.
+
+	   Can be one of the following:
+
+	   s8x6
+	   s16x6
+	   s32x6
+	   s48x6
+	   s8x4
+	   s16x4
+	   s32x4
+       nns Set the number of neurons in predictor neural network.  Can be one
+	   of the following:
+
+	   n16
+	   n32
+	   n64
+	   n128
+	   n256
+       qual
+	   Controls the number of different neural network predictions that
+	   are blended together to compute the final output value. Can be
+	   "fast", default or "slow".
+
+       etype
+	   Set which set of weights to use in the predictor.  Can be one of
+	   the following:
+
+	   a, abs
+	       weights trained to minimize absolute error
+
+	   s, mse
+	       weights trained to minimize squared error
+
+       pscrn
+	   Controls whether or not the prescreener neural network is used to
+	   decide which pixels should be processed by the predictor neural
+	   network and which can be handled by simple cubic interpolation.
+	   The prescreener is trained to know whether cubic interpolation will
+	   be sufficient for a pixel or whether it should be predicted by the
+	   predictor nn.  The computational complexity of the prescreener nn
+	   is much less than that of the predictor nn. Since most pixels can
+	   be handled by cubic interpolation, using the prescreener generally
+	   results in much faster processing.  The prescreener is pretty
+	   accurate, so the difference between using it and not using it is
+	   almost always unnoticeable.
+
+	   Can be one of the following:
+
+	   none
+	   original
+	   new
+	   new2
+	   new3
+
+	   Default is "new".
+
+       Commands
+
+       This filter supports same commands as options, excluding weights
+       option.
+
+   noformat
+       Force libavfilter not to use any of the specified pixel formats for the
+       input to the next filter.
+
+       It accepts the following parameters:
+
+       pix_fmts
+	   A '|'-separated list of pixel format names, such as
+	   pix_fmts=yuv420p|monow|rgb24".
+
+       Examples
+
+       o   Force libavfilter to use a format different from yuv420p for the
+	   input to the vflip filter:
+
+		   noformat=pix_fmts=yuv420p,vflip
+
+       o   Convert the input video to any of the formats not contained in the
+	   list:
+
+		   noformat=yuv420p|yuv444p|yuv410p
+
+   noise
+       Add noise on video input frame.
+
+       The filter accepts the following options:
+
+       all_seed
+       c0_seed
+       c1_seed
+       c2_seed
+       c3_seed
+	   Set noise seed for specific pixel component or all pixel components
+	   in case of all_seed. Default value is 123457.
+
+       all_strength, alls
+       c0_strength, c0s
+       c1_strength, c1s
+       c2_strength, c2s
+       c3_strength, c3s
+	   Set noise strength for specific pixel component or all pixel
+	   components in case all_strength. Default value is 0. Allowed range
+	   is [0, 100].
+
+       all_flags, allf
+       c0_flags, c0f
+       c1_flags, c1f
+       c2_flags, c2f
+       c3_flags, c3f
+	   Set pixel component flags or set flags for all components if
+	   all_flags.  Available values for component flags are:
+
+	   a   averaged temporal noise (smoother)
+
+	   p   mix random noise with a (semi)regular pattern
+
+	   t   temporal noise (noise pattern changes between frames)
+
+	   u   uniform noise (gaussian otherwise)
+
+       Examples
+
+       Add temporal and uniform noise to input video:
+
+	       noise=alls=20:allf=t+u
+
+   normalize
+       Normalize RGB video (aka histogram stretching, contrast stretching).
+       See: https://en.wikipedia.org/wiki/Normalization_(image_processing)
+
+       For each channel of each frame, the filter computes the input range and
+       maps it linearly to the user-specified output range. The output range
+       defaults to the full dynamic range from pure black to pure white.
+
+       Temporal smoothing can be used on the input range to reduce flickering
+       (rapid changes in brightness) caused when small dark or bright objects
+       enter or leave the scene. This is similar to the auto-exposure
+       (automatic gain control) on a video camera, and, like a video camera,
+       it may cause a period of over- or under-exposure of the video.
+
+       The R,G,B channels can be normalized independently, which may cause
+       some color shifting, or linked together as a single channel, which
+       prevents color shifting. Linked normalization preserves hue.
+       Independent normalization does not, so it can be used to remove some
+       color casts. Independent and linked normalization can be combined in
+       any ratio.
+
+       The normalize filter accepts the following options:
+
+       blackpt
+       whitept
+	   Colors which define the output range. The minimum input value is
+	   mapped to the blackpt. The maximum input value is mapped to the
+	   whitept.  The defaults are black and white respectively. Specifying
+	   white for blackpt and black for whitept will give color-inverted,
+	   normalized video. Shades of grey can be used to reduce the dynamic
+	   range (contrast). Specifying saturated colors here can create some
+	   interesting effects.
+
+       smoothing
+	   The number of previous frames to use for temporal smoothing. The
+	   input range of each channel is smoothed using a rolling average
+	   over the current frame and the smoothing previous frames. The
+	   default is 0 (no temporal smoothing).
+
+       independence
+	   Controls the ratio of independent (color shifting) channel
+	   normalization to linked (color preserving) normalization. 0.0 is
+	   fully linked, 1.0 is fully independent. Defaults to 1.0 (fully
+	   independent).
+
+       strength
+	   Overall strength of the filter. 1.0 is full strength. 0.0 is a
+	   rather expensive no-op. Defaults to 1.0 (full strength).
+
+       Commands
+
+       This filter supports same commands as options, excluding smoothing
+       option.	The command accepts the same syntax of the corresponding
+       option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+       Examples
+
+       Stretch video contrast to use the full dynamic range, with no temporal
+       smoothing; may flicker depending on the source content:
+
+	       normalize=blackpt=black:whitept=white:smoothing=0
+
+       As above, but with 50 frames of temporal smoothing; flicker should be
+       reduced, depending on the source content:
+
+	       normalize=blackpt=black:whitept=white:smoothing=50
+
+       As above, but with hue-preserving linked channel normalization:
+
+	       normalize=blackpt=black:whitept=white:smoothing=50:independence=0
+
+       As above, but with half strength:
+
+	       normalize=blackpt=black:whitept=white:smoothing=50:independence=0:strength=0.5
+
+       Map the darkest input color to red, the brightest input color to cyan:
+
+	       normalize=blackpt=red:whitept=cyan
+
+   null
+       Pass the video source unchanged to the output.
+
+   ocr
+       Optical Character Recognition
+
+       This filter uses Tesseract for optical character recognition. To enable
+       compilation of this filter, you need to configure FFmpeg with
+       "--enable-libtesseract".
+
+       It accepts the following options:
+
+       datapath
+	   Set datapath to tesseract data. Default is to use whatever was set
+	   at installation.
+
+       language
+	   Set language, default is "eng".
+
+       whitelist
+	   Set character whitelist.
+
+       blacklist
+	   Set character blacklist.
+
+       The filter exports recognized text as the frame metadata
+       "lavfi.ocr.text".  The filter exports confidence of recognized words as
+       the frame metadata "lavfi.ocr.confidence".
+
+   ocv
+       Apply a video transform using libopencv.
+
+       To enable this filter, install the libopencv library and headers and
+       configure FFmpeg with "--enable-libopencv".
+
+       It accepts the following parameters:
+
+       filter_name
+	   The name of the libopencv filter to apply.
+
+       filter_params
+	   The parameters to pass to the libopencv filter. If not specified,
+	   the default values are assumed.
+
+       Refer to the official libopencv documentation for more precise
+       information:
+       <http://docs.opencv.org/master/modules/imgproc/doc/filtering.html>
+
+       Several libopencv filters are supported; see the following subsections.
+
+       dilate
+
+       Dilate an image by using a specific structuring element.  It
+       corresponds to the libopencv function "cvDilate".
+
+       It accepts the parameters: struct_el|nb_iterations.
+
+       struct_el represents a structuring element, and has the syntax:
+       colsxrows+anchor_xxanchor_y/shape
+
+       cols and rows represent the number of columns and rows of the
+       structuring element, anchor_x and anchor_y the anchor point, and shape
+       the shape for the structuring element. shape must be "rect", "cross",
+       "ellipse", or "custom".
+
+       If the value for shape is "custom", it must be followed by a string of
+       the form "=filename". The file with name filename is assumed to
+       represent a binary image, with each printable character corresponding
+       to a bright pixel. When a custom shape is used, cols and rows are
+       ignored, the number or columns and rows of the read file are assumed
+       instead.
+
+       The default value for struct_el is "3x3+0x0/rect".
+
+       nb_iterations specifies the number of times the transform is applied to
+       the image, and defaults to 1.
+
+       Some examples:
+
+	       # Use the default values
+	       ocv=dilate
+
+	       # Dilate using a structuring element with a 5x5 cross, iterating two times
+	       ocv=filter_name=dilate:filter_params=5x5+2x2/cross|2
+
+	       # Read the shape from the file diamond.shape, iterating two times.
+	       # The file diamond.shape may contain a pattern of characters like this
+	       #   *
+	       #  ***
+	       # *****
+	       #  ***
+	       #   *
+	       # The specified columns and rows are ignored
+	       # but the anchor point coordinates are not
+	       ocv=dilate:0x0+2x2/custom=diamond.shape|2
+
+       erode
+
+       Erode an image by using a specific structuring element.	It corresponds
+       to the libopencv function "cvErode".
+
+       It accepts the parameters: struct_el:nb_iterations, with the same
+       syntax and semantics as the dilate filter.
+
+       smooth
+
+       Smooth the input video.
+
+       The filter takes the following parameters:
+       type|param1|param2|param3|param4.
+
+       type is the type of smooth filter to apply, and must be one of the
+       following values: "blur", "blur_no_scale", "median", "gaussian", or
+       "bilateral". The default value is "gaussian".
+
+       The meaning of param1, param2, param3, and param4 depends on the smooth
+       type. param1 and param2 accept integer positive values or 0. param3 and
+       param4 accept floating point values.
+
+       The default value for param1 is 3. The default value for the other
+       parameters is 0.
+
+       These parameters correspond to the parameters assigned to the libopencv
+       function "cvSmooth".
+
+   oscilloscope
+       2D Video Oscilloscope.
+
+       Useful to measure spatial impulse, step responses, chroma delays, etc.
+
+       It accepts the following parameters:
+
+       x   Set scope center x position.
+
+       y   Set scope center y position.
+
+       s   Set scope size, relative to frame diagonal.
+
+       t   Set scope tilt/rotation.
+
+       o   Set trace opacity.
+
+       tx  Set trace center x position.
+
+       ty  Set trace center y position.
+
+       tw  Set trace width, relative to width of frame.
+
+       th  Set trace height, relative to height of frame.
+
+       c   Set which components to trace. By default it traces first three
+	   components.
+
+       g   Draw trace grid. By default is enabled.
+
+       st  Draw some statistics. By default is enabled.
+
+       sc  Draw scope. By default is enabled.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+       Examples
+
+       o   Inspect full first row of video frame.
+
+		   oscilloscope=x=0.5:y=0:s=1
+
+       o   Inspect full last row of video frame.
+
+		   oscilloscope=x=0.5:y=1:s=1
+
+       o   Inspect full 5th line of video frame of height 1080.
+
+		   oscilloscope=x=0.5:y=5/1080:s=1
+
+       o   Inspect full last column of video frame.
+
+		   oscilloscope=x=1:y=0.5:s=1:t=1
+
+   overlay
+       Overlay one video on top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.
+
+       It accepts the following parameters:
+
+       A description of the accepted options follows.
+
+       x
+       y   Set the expression for the x and y coordinates of the overlaid
+	   video on the main video. Default value is "0" for both expressions.
+	   In case the expression is invalid, it is set to a huge value
+	   (meaning that the overlay will not be displayed within the output
+	   visible area).
+
+       eof_action
+	   See framesync.
+
+       eval
+	   Set when the expressions for x, and y are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       only evaluate expressions once during the filter initialization
+	       or when a command is processed
+
+	   frame
+	       evaluate expressions for each incoming frame
+
+	   Default value is frame.
+
+       shortest
+	   See framesync.
+
+       format
+	   Set the format for the output video.
+
+	   It accepts the following values:
+
+	   yuv420
+	       force YUV 4:2:0 8-bit planar output
+
+	   yuv420p10
+	       force YUV 4:2:0 10-bit planar output
+
+	   yuv422
+	       force YUV 4:2:2 8-bit planar output
+
+	   yuv422p10
+	       force YUV 4:2:2 10-bit planar output
+
+	   yuv444
+	       force YUV 4:4:4 8-bit planar output
+
+	   yuv444p10
+	       force YUV 4:4:4 10-bit planar output
+
+	   rgb force RGB 8-bit packed output
+
+	   gbrp
+	       force RGB 8-bit planar output
+
+	   auto
+	       automatically pick format
+
+	   Default value is yuv420.
+
+       repeatlast
+	   See framesync.
+
+       alpha
+	   Set format of alpha of the overlaid video, it can be straight or
+	   premultiplied. Default is straight.
+
+       The x, and y expressions can contain the following parameters.
+
+       main_w, W
+       main_h, H
+	   The main input width and height.
+
+       overlay_w, w
+       overlay_h, h
+	   The overlay input width and height.
+
+       x
+       y   The computed values for x and y. They are evaluated for each new
+	   frame.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values of the output
+	   format. For example for the pixel format "yuv422p" hsub is 2 and
+	   vsub is 1.
+
+       n   the number of input frame, starting from 0
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       t   The timestamp, expressed in seconds. It's NAN if the input
+	   timestamp is unknown.
+
+       This filter also supports the framesync options.
+
+       Note that the n, t variables are available only when evaluation is done
+       per frame, and will evaluate to NAN when eval is set to init.
+
+       Be aware that frames are taken from each input video in timestamp
+       order, hence, if their initial timestamps differ, it is a good idea to
+       pass the two inputs through a setpts=PTS-STARTPTS filter to have them
+       begin in the same zero timestamp, as the example for the movie filter
+       does.
+
+       You can chain together more overlays but you should test the efficiency
+       of such approach.
+
+       Commands
+
+       This filter supports the following commands:
+
+       x
+       y   Modify the x and y of the overlay input.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+       Examples
+
+       o   Draw the overlay at 10 pixels from the bottom right corner of the
+	   main video:
+
+		   overlay=main_w-overlay_w-10:main_h-overlay_h-10
+
+	   Using named options the example above becomes:
+
+		   overlay=x=main_w-overlay_w-10:y=main_h-overlay_h-10
+
+       o   Insert a transparent PNG logo in the bottom left corner of the
+	   input, using the ffmpeg tool with the "-filter_complex" option:
+
+		   ffmpeg -i input -i logo -filter_complex 'overlay=10:main_h-overlay_h-10' output
+
+       o   Insert 2 different transparent PNG logos (second logo on bottom
+	   right corner) using the ffmpeg tool:
+
+		   ffmpeg -i input -i logo1 -i logo2 -filter_complex 'overlay=x=10:y=H-h-10,overlay=x=W-w-10:y=H-h-10' output
+
+       o   Add a transparent color layer on top of the main video; "WxH" must
+	   specify the size of the main input to the overlay filter:
+
+		   color=color=red@.3:size=WxH [over]; [in][over] overlay [out]
+
+       o   Play an original video and a filtered version (here with the
+	   deshake filter) side by side using the ffplay tool:
+
+		   ffplay input.avi -vf 'split[a][b]; [a]pad=iw*2:ih[src]; [b]deshake[filt]; [src][filt]overlay=w'
+
+	   The above command is the same as:
+
+		   ffplay input.avi -vf 'split[b], pad=iw*2[src], [b]deshake, [src]overlay=w'
+
+       o   Make a sliding overlay appearing from the left to the right top
+	   part of the screen starting since time 2:
+
+		   overlay=x='if(gte(t,2), -w+(t-2)*20, NAN)':y=0
+
+       o   Compose output by putting two input videos side to side:
+
+		   ffmpeg -i left.avi -i right.avi -filter_complex "
+		   nullsrc=size=200x100 [background];
+		   [0:v] setpts=PTS-STARTPTS, scale=100x100 [left];
+		   [1:v] setpts=PTS-STARTPTS, scale=100x100 [right];
+		   [background][left]	    overlay=shortest=1	     [background+left];
+		   [background+left][right] overlay=shortest=1:x=100 [left+right]
+		   "
+
+       o   Mask 10-20 seconds of a video by applying the delogo filter to a
+	   section
+
+		   ffmpeg -i test.avi -codec:v:0 wmv2 -ar 11025 -b:v 9000k
+		   -vf '[in]split[split_main][split_delogo];[split_delogo]trim=start=360:end=371,delogo=0:0:640:480[delogoed];[split_main][delogoed]overlay=eof_action=pass[out]'
+		   masked.avi
+
+       o   Chain several overlays in cascade:
+
+		   nullsrc=s=200x200 [bg];
+		   testsrc=s=100x100, split=4 [in0][in1][in2][in3];
+		   [in0] lutrgb=r=0, [bg]   overlay=0:0     [mid0];
+		   [in1] lutrgb=g=0, [mid0] overlay=100:0   [mid1];
+		   [in2] lutrgb=b=0, [mid1] overlay=0:100   [mid2];
+		   [in3] null,	     [mid2] overlay=100:100 [out0]
+
+   overlay_cuda
+       Overlay one video on top of another.
+
+       This is the CUDA variant of the overlay filter.	It only accepts CUDA
+       frames. The underlying input pixel formats have to match.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.
+
+       It accepts the following parameters:
+
+       x
+       y   Set expressions for the x and y coordinates of the overlaid video
+	   on the main video.
+
+	   They can contain the following parameters:
+
+	   main_w, W
+	   main_h, H
+	       The main input width and height.
+
+	   overlay_w, w
+	   overlay_h, h
+	       The overlay input width and height.
+
+	   x
+	   y   The computed values for x and y. They are evaluated for each
+	       new frame.
+
+	   n   The ordinal index of the main input frame, starting from 0.
+
+	   pos The byte offset position in the file of the main input frame,
+	       NAN if unknown.	Deprecated, do not use.
+
+	   t   The timestamp of the main input frame, expressed in seconds,
+	       NAN if unknown.
+
+	   Default value is "0" for both expressions.
+
+       eval
+	   Set when the expressions for x and y are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       Evaluate expressions once during filter initialization or when
+	       a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame
+
+	   Default value is frame.
+
+       eof_action
+	   See framesync.
+
+       shortest
+	   See framesync.
+
+       repeatlast
+	   See framesync.
+
+       This filter also supports the framesync options.
+
+   owdenoise
+       Apply Overcomplete Wavelet denoiser.
+
+       The filter accepts the following options:
+
+       depth
+	   Set depth.
+
+	   Larger depth values will denoise lower frequency components more,
+	   but slow down filtering.
+
+	   Must be an int in the range 8-16, default is 8.
+
+       luma_strength, ls
+	   Set luma strength.
+
+	   Must be a double value in the range 0-1000, default is 1.0.
+
+       chroma_strength, cs
+	   Set chroma strength.
+
+	   Must be a double value in the range 0-1000, default is 1.0.
+
+   pad
+       Add paddings to the input image, and place the original input at the
+       provided x, y coordinates.
+
+       It accepts the following parameters:
+
+       width, w
+       height, h
+	   Specify an expression for the size of the output image with the
+	   paddings added. If the value for width or height is 0, the
+	   corresponding input size is used for the output.
+
+	   The width expression can reference the value set by the height
+	   expression, and vice versa.
+
+	   The default value of width and height is 0.
+
+       x
+       y   Specify the offsets to place the input image at within the padded
+	   area, with respect to the top/left border of the output image.
+
+	   The x expression can reference the value set by the y expression,
+	   and vice versa.
+
+	   The default value of x and y is 0.
+
+	   If x or y evaluate to a negative number, they'll be changed so the
+	   input image is centered on the padded area.
+
+       color
+	   Specify the color of the padded area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of color is "black".
+
+       eval
+	   Specify when to evaluate  width, height, x and y expression.
+
+	   It accepts the following values:
+
+	   init
+	       Only evaluate expressions once during the filter initialization
+	       or when a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+	   Default value is init.
+
+       aspect
+	   Pad to aspect instead to a resolution.
+
+       The value for the width, height, x, and y options are expressions
+       containing the following constants:
+
+       in_w
+       in_h
+	   The input video width and height.
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output width and height (the size of the padded area), as
+	   specified by the width and height expressions.
+
+       ow
+       oh  These are the same as out_w and out_h.
+
+       x
+       y   The x and y offsets as specified by the x and y expressions, or NAN
+	   if not yet specified.
+
+       a   same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (iw / ih) * sar
+
+       hsub
+       vsub
+	   The horizontal and vertical chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       Examples
+
+       o   Add paddings with the color "violet" to the input video. The output
+	   video size is 640x480, and the top-left corner of the input video
+	   is placed at column 0, row 40
+
+		   pad=640:480:0:40:violet
+
+	   The example above is equivalent to the following command:
+
+		   pad=width=640:height=480:x=0:y=40:color=violet
+
+       o   Pad the input to get an output with dimensions increased by 3/2,
+	   and put the input video at the center of the padded area:
+
+		   pad="3/2*iw:3/2*ih:(ow-iw)/2:(oh-ih)/2"
+
+       o   Pad the input to get a squared output with size equal to the
+	   maximum value between the input width and height, and put the input
+	   video at the center of the padded area:
+
+		   pad="max(iw\,ih):ow:(ow-iw)/2:(oh-ih)/2"
+
+       o   Pad the input to get a final w/h ratio of 16:9:
+
+		   pad="ih*16/9:ih:(ow-iw)/2:(oh-ih)/2"
+
+       o   In case of anamorphic video, in order to set the output display
+	   aspect correctly, it is necessary to use sar in the expression,
+	   according to the relation:
+
+		   (ih * X / ih) * sar = output_dar
+		   X = output_dar / sar
+
+	   Thus the previous example needs to be modified to:
+
+		   pad="ih*16/9/sar:ih:(ow-iw)/2:(oh-ih)/2"
+
+       o   Double the output size and put the input video in the bottom-right
+	   corner of the output padded area:
+
+		   pad="2*iw:2*ih:ow-iw:oh-ih"
+
+   palettegen
+       Generate one palette for a whole video stream.
+
+       It accepts the following options:
+
+       max_colors
+	   Set the maximum number of colors to quantize in the palette.  Note:
+	   the palette will still contain 256 colors; the unused palette
+	   entries will be black.
+
+       reserve_transparent
+	   Create a palette of 255 colors maximum and reserve the last one for
+	   transparency. Reserving the transparency color is useful for GIF
+	   optimization.  If not set, the maximum of colors in the palette
+	   will be 256. You probably want to disable this option for a
+	   standalone image.  Set by default.
+
+       transparency_color
+	   Set the color that will be used as background for transparency.
+
+       stats_mode
+	   Set statistics mode.
+
+	   It accepts the following values:
+
+	   full
+	       Compute full frame histograms.
+
+	   diff
+	       Compute histograms only for the part that differs from previous
+	       frame. This might be relevant to give more importance to the
+	       moving part of your input if the background is static.
+
+	   single
+	       Compute new histogram for each frame.
+
+	   Default value is full.
+
+       The filter also exports the frame metadata "lavfi.color_quant_ratio"
+       ("nb_color_in / nb_color_out") which you can use to evaluate the degree
+       of color quantization of the palette. This information is also visible
+       at info logging level.
+
+       Examples
+
+       o   Generate a representative palette of a given video using ffmpeg:
+
+		   ffmpeg -i input.mkv -vf palettegen palette.png
+
+   paletteuse
+       Use a palette to downsample an input video stream.
+
+       The filter takes two inputs: one video stream and a palette. The
+       palette must be a 256 pixels image.
+
+       It accepts the following options:
+
+       dither
+	   Select dithering mode. Available algorithms are:
+
+	   bayer
+	       Ordered 8x8 bayer dithering (deterministic)
+
+	   heckbert
+	       Dithering as defined by Paul Heckbert in 1982 (simple error
+	       diffusion).  Note: this dithering is sometimes considered
+	       "wrong" and is included as a reference.
+
+	   floyd_steinberg
+	       Floyd and Steingberg dithering (error diffusion)
+
+	   sierra2
+	       Frankie Sierra dithering v2 (error diffusion)
+
+	   sierra2_4a
+	       Frankie Sierra dithering v2 "Lite" (error diffusion)
+
+	   sierra3
+	       Frankie Sierra dithering v3 (error diffusion)
+
+	   burkes
+	       Burkes dithering (error diffusion)
+
+	   atkinson
+	       Atkinson dithering by Bill Atkinson at Apple Computer (error
+	       diffusion)
+
+	   none
+	       Disable dithering.
+
+	   Default is sierra2_4a.
+
+       bayer_scale
+	   When bayer dithering is selected, this option defines the scale of
+	   the pattern (how much the crosshatch pattern is visible). A low
+	   value means more visible pattern for less banding, and higher value
+	   means less visible pattern at the cost of more banding.
+
+	   The option must be an integer value in the range [0,5]. Default is
+	   2.
+
+       diff_mode
+	   If set, define the zone to process
+
+	   rectangle
+	       Only the changing rectangle will be reprocessed. This is
+	       similar to GIF cropping/offsetting compression mechanism. This
+	       option can be useful for speed if only a part of the image is
+	       changing, and has use cases such as limiting the scope of the
+	       error diffusal dither to the rectangle that bounds the moving
+	       scene (it leads to more deterministic output if the scene
+	       doesn't change much, and as a result less moving noise and
+	       better GIF compression).
+
+	   Default is none.
+
+       new Take new palette for each output frame.
+
+       alpha_threshold
+	   Sets the alpha threshold for transparency. Alpha values above this
+	   threshold will be treated as completely opaque, and values below
+	   this threshold will be treated as completely transparent.
+
+	   The option must be an integer value in the range [0,255]. Default
+	   is 128.
+
+       Examples
+
+       o   Use a palette (generated for example with palettegen) to encode a
+	   GIF using ffmpeg:
+
+		   ffmpeg -i input.mkv -i palette.png -lavfi paletteuse output.gif
+
+   perspective
+       Correct perspective of video not recorded perpendicular to the screen.
+
+       A description of the accepted parameters follows.
+
+       x0
+       y0
+       x1
+       y1
+       x2
+       y2
+       x3
+       y3  Set coordinates expression for top left, top right, bottom left and
+	   bottom right corners.  Default values are "0:0:W:0:0:H:W:H" with
+	   which perspective will remain unchanged.  If the "sense" option is
+	   set to "source", then the specified points will be sent to the
+	   corners of the destination. If the "sense" option is set to
+	   "destination", then the corners of the source will be sent to the
+	   specified coordinates.
+
+	   The expressions can use the following variables:
+
+	   W
+	   H   the width and height of video frame.
+
+	   in  Input frame count.
+
+	   on  Output frame count.
+
+       interpolation
+	   Set interpolation for perspective correction.
+
+	   It accepts the following values:
+
+	   linear
+	   cubic
+
+	   Default value is linear.
+
+       sense
+	   Set interpretation of coordinate options.
+
+	   It accepts the following values:
+
+	   0, source
+	       Send point in the source specified by the given coordinates to
+	       the corners of the destination.
+
+	   1, destination
+	       Send the corners of the source to the point in the destination
+	       specified by the given coordinates.
+
+	       Default value is source.
+
+       eval
+	   Set when the expressions for coordinates x0,y0,...x3,y3 are
+	   evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       only evaluate expressions once during the filter initialization
+	       or when a command is processed
+
+	   frame
+	       evaluate expressions for each incoming frame
+
+	   Default value is init.
+
+   phase
+       Delay interlaced video by one field time so that the field order
+       changes.
+
+       The intended use is to fix PAL movies that have been captured with the
+       opposite field order to the film-to-video transfer.
+
+       A description of the accepted parameters follows.
+
+       mode
+	   Set phase mode.
+
+	   It accepts the following values:
+
+	   t   Capture field order top-first, transfer bottom-first.  Filter
+	       will delay the bottom field.
+
+	   b   Capture field order bottom-first, transfer top-first.  Filter
+	       will delay the top field.
+
+	   p   Capture and transfer with the same field order. This mode only
+	       exists for the documentation of the other options to refer to,
+	       but if you actually select it, the filter will faithfully do
+	       nothing.
+
+	   a   Capture field order determined automatically by field flags,
+	       transfer opposite.  Filter selects among t and b modes on a
+	       frame by frame basis using field flags. If no field information
+	       is available, then this works just like u.
+
+	   u   Capture unknown or varying, transfer opposite.  Filter selects
+	       among t and b on a frame by frame basis by analyzing the images
+	       and selecting the alternative that produces best match between
+	       the fields.
+
+	   T   Capture top-first, transfer unknown or varying.	Filter selects
+	       among t and p using image analysis.
+
+	   B   Capture bottom-first, transfer unknown or varying.  Filter
+	       selects among b and p using image analysis.
+
+	   A   Capture determined by field flags, transfer unknown or varying.
+	       Filter selects among t, b and p using field flags and image
+	       analysis. If no field information is available, then this works
+	       just like U. This is the default mode.
+
+	   U   Both capture and transfer unknown or varying.  Filter selects
+	       among t, b and p using image analysis only.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   photosensitivity
+       Reduce various flashes in video, so to help users with epilepsy.
+
+       It accepts the following options:
+
+       frames, f
+	   Set how many frames to use when filtering. Default is 30.
+
+       threshold, t
+	   Set detection threshold factor. Default is 1.  Lower is stricter.
+
+       skip
+	   Set how many pixels to skip when sampling frames. Default is 1.
+	   Allowed range is from 1 to 1024.
+
+       bypass
+	   Leave frames unchanged. Default is disabled.
+
+   pixdesctest
+       Pixel format descriptor test filter, mainly useful for internal
+       testing. The output video should be equal to the input video.
+
+       For example:
+
+	       format=monow, pixdesctest
+
+       can be used to test the monowhite pixel format descriptor definition.
+
+   pixelize
+       Apply pixelization to video stream.
+
+       The filter accepts the following options:
+
+       width, w
+       height, h
+	   Set block dimensions that will be used for pixelization.  Default
+	   value is 16.
+
+       mode, m
+	   Set the mode of pixelization used.
+
+	   Possible values are:
+
+	   avg
+	   min
+	   max
+
+	   Default value is "avg".
+
+       planes, p
+	   Set what planes to filter. Default is to filter all planes.
+
+       Commands
+
+       This filter supports all options as commands.
+
+   pixscope
+       Display sample values of color channels. Mainly useful for checking
+       color and levels. Minimum supported resolution is 640x480.
+
+       The filters accept the following options:
+
+       x   Set scope X position, relative offset on X axis.
+
+       y   Set scope Y position, relative offset on Y axis.
+
+       w   Set scope width.
+
+       h   Set scope height.
+
+       o   Set window opacity. This window also holds statistics about pixel
+	   area.
+
+       wx  Set window X position, relative offset on X axis.
+
+       wy  Set window Y position, relative offset on Y axis.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   pp
+       Enable the specified chain of postprocessing subfilters using
+       libpostproc. This library should be automatically selected with a GPL
+       build ("--enable-gpl").	Subfilters must be separated by '/' and can be
+       disabled by prepending a '-'.  Each subfilter and some options have a
+       short and a long name that can be used interchangeably, i.e. dr/dering
+       are the same.
+
+       The filters accept the following options:
+
+       subfilters
+	   Set postprocessing subfilters string.
+
+       All subfilters share common options to determine their scope:
+
+       a/autoq
+	   Honor the quality commands for this subfilter.
+
+       c/chrom
+	   Do chrominance filtering, too (default).
+
+       y/nochrom
+	   Do luma filtering only (no chrominance).
+
+       n/noluma
+	   Do chrominance filtering only (no luma).
+
+       These options can be appended after the subfilter name, separated by a
+       '|'.
+
+       Available subfilters are:
+
+       hb/hdeblock[|difference[|flatness]]
+	   Horizontal deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       vb/vdeblock[|difference[|flatness]]
+	   Vertical deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       ha/hadeblock[|difference[|flatness]]
+	   Accurate horizontal deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       va/vadeblock[|difference[|flatness]]
+	   Accurate vertical deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       The horizontal and vertical deblocking filters share the difference and
+       flatness values so you cannot set different horizontal and vertical
+       thresholds.
+
+       h1/x1hdeblock
+	   Experimental horizontal deblocking filter
+
+       v1/x1vdeblock
+	   Experimental vertical deblocking filter
+
+       dr/dering
+	   Deringing filter
+
+       tn/tmpnoise[|threshold1[|threshold2[|threshold3]]], temporal noise
+       reducer
+	   threshold1
+	       larger -> stronger filtering
+
+	   threshold2
+	       larger -> stronger filtering
+
+	   threshold3
+	       larger -> stronger filtering
+
+       al/autolevels[:f/fullyrange], automatic brightness / contrast
+       correction
+	   f/fullyrange
+	       Stretch luma to "0-255".
+
+       lb/linblenddeint
+	   Linear blend deinterlacing filter that deinterlaces the given block
+	   by filtering all lines with a "(1 2 1)" filter.
+
+       li/linipoldeint
+	   Linear interpolating deinterlacing filter that deinterlaces the
+	   given block by linearly interpolating every second line.
+
+       ci/cubicipoldeint
+	   Cubic interpolating deinterlacing filter deinterlaces the given
+	   block by cubically interpolating every second line.
+
+       md/mediandeint
+	   Median deinterlacing filter that deinterlaces the given block by
+	   applying a median filter to every second line.
+
+       fd/ffmpegdeint
+	   FFmpeg deinterlacing filter that deinterlaces the given block by
+	   filtering every second line with a "(-1 4 2 4 -1)" filter.
+
+       l5/lowpass5
+	   Vertically applied FIR lowpass deinterlacing filter that
+	   deinterlaces the given block by filtering all lines with a "(-1 2 6
+	   2 -1)" filter.
+
+       fq/forceQuant[|quantizer]
+	   Overrides the quantizer table from the input with the constant
+	   quantizer you specify.
+
+	   quantizer
+	       Quantizer to use
+
+       de/default
+	   Default pp filter combination ("hb|a,vb|a,dr|a")
+
+       fa/fast
+	   Fast pp filter combination ("h1|a,v1|a,dr|a")
+
+       ac  High quality pp filter combination ("ha|a|128|7,va|a,dr|a")
+
+       Examples
+
+       o   Apply horizontal and vertical deblocking, deringing and automatic
+	   brightness/contrast:
+
+		   pp=hb/vb/dr/al
+
+       o   Apply default filters without brightness/contrast correction:
+
+		   pp=de/-al
+
+       o   Apply default filters and temporal denoiser:
+
+		   pp=default/tmpnoise|1|2|3
+
+       o   Apply deblocking on luma only, and switch vertical deblocking on or
+	   off automatically depending on available CPU time:
+
+		   pp=hb|y/vb|a
+
+   pp7
+       Apply Postprocessing filter 7. It is variant of the spp filter, similar
+       to spp = 6 with 7 point DCT, where only the center sample is used after
+       IDCT.
+
+       The filter accepts the following options:
+
+       qp  Force a constant quantization parameter. It accepts an integer in
+	   range 0 to 63. If not set, the filter will use the QP from the
+	   video stream (if available).
+
+       mode
+	   Set thresholding mode. Available modes are:
+
+	   hard
+	       Set hard thresholding.
+
+	   soft
+	       Set soft thresholding (better de-ringing effect, but likely
+	       blurrier).
+
+	   medium
+	       Set medium thresholding (good results, default).
+
+   premultiply
+       Apply alpha premultiply effect to input video stream using first plane
+       of second stream as alpha.
+
+       Both streams must have same dimensions and same pixel format.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       inplace
+	   Do not require 2nd input for processing, instead use alpha plane
+	   from input stream.
+
+   prewitt
+       Apply prewitt operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   pseudocolor
+       Alter frame colors in video with pseudocolors.
+
+       This filter accepts the following options:
+
+       c0  set pixel first component expression
+
+       c1  set pixel second component expression
+
+       c2  set pixel third component expression
+
+       c3  set pixel fourth component expression, corresponds to the alpha
+	   component
+
+       index, i
+	   set component to use as base for altering colors
+
+       preset, p
+	   Pick one of built-in LUTs. By default is set to none.
+
+	   Available LUTs:
+
+	   magma
+	   inferno
+	   plasma
+	   viridis
+	   turbo
+	   cividis
+	   range1
+	   range2
+	   shadows
+	   highlights
+	   solar
+	   nominal
+	   preferred
+	   total
+	   spectral
+	   cool
+	   heat
+	   fiery
+	   blues
+	   green
+	   helix
+       opacity
+	   Set opacity of output colors. Allowed range is from 0 to 1.
+	   Default value is set to 1.
+
+       Each of the expression options specifies the expression to use for
+       computing the lookup table for the corresponding pixel component
+       values.
+
+       The expressions can contain the following constants and functions:
+
+       w
+       h   The input width and height.
+
+       val The input value for the pixel component.
+
+       ymin, umin, vmin, amin
+	   The minimum allowed component value.
+
+       ymax, umax, vmax, amax
+	   The maximum allowed component value.
+
+       All expressions default to "val".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Change too high luma values to gradient:
+
+		   pseudocolor="'if(between(val,ymax,amax),lerp(ymin,ymax,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(umax,umin,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(vmin,vmax,(val-ymax)/(amax-ymax)),-1):-1'"
+
+   psnr
+       Obtain the average, maximum and minimum PSNR (Peak Signal to Noise
+       Ratio) between two input videos.
+
+       This filter takes in input two input videos, the first input is
+       considered the "main" source and is passed unchanged to the output. The
+       second input is used as a "reference" video for computing the PSNR.
+
+       Both video inputs must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained average PSNR is printed through the logging system.
+
+       The filter stores the accumulated MSE (mean squared error) of each
+       frame, and at the end of the processing it is averaged across all
+       frames equally, and the following formula is applied to obtain the
+       PSNR:
+
+	       PSNR = 10*log10(MAX^2/MSE)
+
+       Where MAX is the average of the maximum values of each component of the
+       image.
+
+       The description of the accepted parameters follows.
+
+       stats_file, f
+	   If specified the filter will use the named file to save the PSNR of
+	   each individual frame. When filename equals "-" the data is sent to
+	   standard output.
+
+       stats_version
+	   Specifies which version of the stats file format to use. Details of
+	   each format are written below.  Default value is 1.
+
+       stats_add_max
+	   Determines whether the max value is output to the stats log.
+	   Default value is 0.	Requires stats_version >= 2. If this is set
+	   and stats_version < 2, the filter will return an error.
+
+       This filter also supports the framesync options.
+
+       The file printed if stats_file is selected, contains a sequence of
+       key/value pairs of the form key:value for each compared couple of
+       frames.
+
+       If a stats_version greater than 1 is specified, a header line precedes
+       the list of per-frame-pair stats, with key value pairs following the
+       frame format with the following parameters:
+
+       psnr_log_version
+	   The version of the log file format. Will match stats_version.
+
+       fields
+	   A comma separated list of the per-frame-pair parameters included in
+	   the log.
+
+       A description of each shown per-frame-pair parameter follows:
+
+       n   sequential number of the input frame, starting from 1
+
+       mse_avg
+	   Mean Square Error pixel-by-pixel average difference of the compared
+	   frames, averaged over all the image components.
+
+       mse_y, mse_u, mse_v, mse_r, mse_g, mse_b, mse_a
+	   Mean Square Error pixel-by-pixel average difference of the compared
+	   frames for the component specified by the suffix.
+
+       psnr_y, psnr_u, psnr_v, psnr_r, psnr_g, psnr_b, psnr_a
+	   Peak Signal to Noise ratio of the compared frames for the component
+	   specified by the suffix.
+
+       max_avg, max_y, max_u, max_v
+	   Maximum allowed value for each channel, and average over all
+	   channels.
+
+       Examples
+
+       o   For example:
+
+		   movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
+		   [main][ref] psnr="stats_file=stats.log" [out]
+
+	   On this example the input file being processed is compared with the
+	   reference file ref_movie.mpg. The PSNR of each individual frame is
+	   stored in stats.log.
+
+       o   Another example with different containers:
+
+		   ffmpeg -i main.mpg -i ref.mkv -lavfi  "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]psnr" -f null -
+
+   pullup
+       Pulldown reversal (inverse telecine) filter, capable of handling mixed
+       hard-telecine, 24000/1001 fps progressive, and 30000/1001 fps
+       progressive content.
+
+       The pullup filter is designed to take advantage of future context in
+       making its decisions. This filter is stateless in the sense that it
+       does not lock onto a pattern to follow, but it instead looks forward to
+       the following fields in order to identify matches and rebuild
+       progressive frames.
+
+       To produce content with an even framerate, insert the fps filter after
+       pullup, use "fps=24000/1001" if the input frame rate is 29.97fps,
+       "fps=24" for 30fps and the (rare) telecined 25fps input.
+
+       The filter accepts the following options:
+
+       jl
+       jr
+       jt
+       jb  These options set the amount of "junk" to ignore at the left,
+	   right, top, and bottom of the image, respectively. Left and right
+	   are in units of 8 pixels, while top and bottom are in units of 2
+	   lines.  The default is 8 pixels on each side.
+
+       sb  Set the strict breaks. Setting this option to 1 will reduce the
+	   chances of filter generating an occasional mismatched frame, but it
+	   may also cause an excessive number of frames to be dropped during
+	   high motion sequences.  Conversely, setting it to -1 will make
+	   filter match fields more easily.  This may help processing of video
+	   where there is slight blurring between the fields, but may also
+	   cause there to be interlaced frames in the output.  Default value
+	   is 0.
+
+       mp  Set the metric plane to use. It accepts the following values:
+
+	   l   Use luma plane.
+
+	   u   Use chroma blue plane.
+
+	   v   Use chroma red plane.
+
+	   This option may be set to use chroma plane instead of the default
+	   luma plane for doing filter's computations. This may improve
+	   accuracy on very clean source material, but more likely will
+	   decrease accuracy, especially if there is chroma noise (rainbow
+	   effect) or any grayscale video.  The main purpose of setting mp to
+	   a chroma plane is to reduce CPU load and make pullup usable in
+	   realtime on slow machines.
+
+       For best results (without duplicated frames in the output file) it is
+       necessary to change the output frame rate. For example, to inverse
+       telecine NTSC input:
+
+	       ffmpeg -i input -vf pullup -r 24000/1001 ...
+
+   qp
+       Change video quantization parameters (QP).
+
+       The filter accepts the following option:
+
+       qp  Set expression for quantization parameter.
+
+       The expression is evaluated through the eval API and can contain, among
+       others, the following constants:
+
+       known
+	   1 if index is not 129, 0 otherwise.
+
+       qp  Sequential index starting from -129 to 128.
+
+       Examples
+
+       o   Some equation like:
+
+		   qp=2+2*sin(PI*qp)
+
+   qrencode
+       Generate a QR code using the libqrencode library (see
+       <https://fukuchi.org/works/qrencode/>), and overlay it on top of the
+       current frame.
+
+       To enable the compilation of this filter, you need to configure FFmpeg
+       with "--enable-libqrencode".
+
+       The QR code is generated from the provided text or text pattern. The
+       corresponding QR code is scaled and overlayed into the video output
+       according to the specified options.
+
+       In case no text is specified, no QR code is overlaied.
+
+       This filter accepts the following options:
+
+       qrcode_width, q
+       padded_qrcode_width, Q
+	   Specify an expression for the width of the rendered QR code, with
+	   and without padding. The qrcode_width expression can reference the
+	   value set by the padded_qrcode_width expression, and vice versa.
+	   By default padded_qrcode_width is set to qrcode_width, meaning that
+	   there is no padding.
+
+	   These expressions are evaluated for each new frame.
+
+	   See the qrencode Expressions section for details.
+
+       x
+       y   Specify an expression for positioning the padded QR code top-left
+	   corner.  The x expression can reference the value set by the y
+	   expression, and vice.
+
+	   By default x and y are set set to 0, meaning that the QR code is
+	   placed in the top left corner of the input.
+
+	   These expressions are evaluated for each new frame.
+
+	   See the qrencode Expressions section for details.
+
+       case_sensitive, cs
+	   Instruct libqrencode to use case sensitive encoding. This is
+	   enabled by default. This can be disabled to reduce the QR encoding
+	   size.
+
+       level, l
+	   Specify the QR encoding error correction level. With an higher
+	   correction level, the encoding size will increase but the code will
+	   be more robust to corruption.  Lower level is L.
+
+	   It accepts the following values:
+
+	   L
+	   M
+	   Q
+	   H
+       expansion
+	   Select how the input text is expanded. Can be either "none", or
+	   "normal" (default). See the qrencode Text expansion section below
+	   for details.
+
+       text
+       textfile
+	   Define the text to be rendered. In case neither is specified, no QR
+	   is encoded (just an empty colored frame).
+
+	   In case expansion is enabled, the text is treated as a text
+	   template, using the qrencode expansion mechanism. See the qrencode
+	   Text expansion section below for details.
+
+       background_color, bc
+       foreground_color, fc
+	   Set the QR code and background color. The default value of
+	   foreground_color is "black", the default value of background_color
+	   is "white".
+
+	   For the syntax of the color options, check the "Color" section in
+	   the ffmpeg-utils manual.
+
+       qrencode Expressions
+
+       The expressions set by the options contain the following constants and
+       functions.
+
+       dar input display aspect ratio, it is the same as (w / h) * sar
+
+       duration
+	   the current frame's duration, in seconds
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       main_h, H
+	   the input height
+
+       main_w, W
+	   the input width
+
+       n   the number of input frame, starting from 0
+
+       pict_type
+	   a number representing the picture type
+
+       qr_w, w
+	   the width of the encoded QR code
+
+       rendered_qr_w, q
+       rendered_padded_qr_w, Q
+	   the width of the rendered QR code, without and without padding.
+
+	   These parameters allow the q and Q expressions to refer to each
+	   other, so you can for example specify "q=3/4*Q".
+
+       rand(min, max)
+	   return a random number included between min and max
+
+       sar the input sample aspect ratio
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       x
+       y   the x and y offset coordinates where the text is drawn.
+
+	   These parameters allow the x and y expressions to refer to each
+	   other, so you can for example specify "y=x/dar".
+
+       qrencode Text expansion
+
+       If expansion is set to "none", the text is printed verbatim.
+
+       If expansion is set to "normal" (which is the default), the following
+       expansion mechanism is used.
+
+       The backslash character \, followed by any character, always expands to
+       the second character.
+
+       Sequences of the form "%{...}" are expanded. The text between the
+       braces is a function name, possibly followed by arguments separated by
+       ':'.  If the arguments contain special characters or delimiters (':' or
+       '}'), they should be escaped.
+
+       Note that they probably must also be escaped as the value for the text
+       option in the filter argument string and as the filter argument in the
+       filtergraph description, and possibly also for the shell, that makes up
+       to four levels of escaping; using a text file with the textfile option
+       avoids these problems.
+
+       The following functions are available:
+
+       n, frame_num
+	   return the frame number
+
+       pts Return the presentation timestamp of the current frame.
+
+	   It can take up to two arguments.
+
+	   The first argument is the format of the timestamp; it defaults to
+	   "flt" for seconds as a decimal number with microsecond accuracy;
+	   "hms" stands for a formatted [-]HH:MM:SS.mmm timestamp with
+	   millisecond accuracy.  "gmtime" stands for the timestamp of the
+	   frame formatted as UTC time; "localtime" stands for the timestamp
+	   of the frame formatted as local time zone time. If the format is
+	   set to "hms24hh", the time is formatted in 24h format (00-23).
+
+	   The second argument is an offset added to the timestamp.
+
+	   If the format is set to "localtime" or "gmtime", a third argument
+	   may be supplied: a "strftime" C function format string. By default,
+	   YYYY-MM-DD HH:MM:SS format will be used.
+
+       expr, e
+	   Evaluate the expression's value and output as a double.
+
+	   It must take one argument specifying the expression to be
+	   evaluated, accepting the constants and functions defined in
+	   qrencode_expressions.
+
+       expr_formatted, ef
+	   Evaluate the expression's value and output as a formatted string.
+
+	   The first argument is the expression to be evaluated, just as for
+	   the expr function.  The second argument specifies the output
+	   format. Allowed values are x, X, d and u. They are treated exactly
+	   as in the "printf" function.  The third parameter is optional and
+	   sets the number of positions taken by the output.  It can be used
+	   to add padding with zeros from the left.
+
+       gmtime
+	   The time at which the filter is running, expressed in UTC.  It can
+	   accept an argument: a "strftime" C function format string.  The
+	   format string is extended to support the variable %[1-6]N which
+	   prints fractions of the second with optionally specified number of
+	   digits.
+
+       localtime
+	   The time at which the filter is running, expressed in the local
+	   time zone.  It can accept an argument: a "strftime" C function
+	   format string.  The format string is extended to support the
+	   variable %[1-6]N which prints fractions of the second with
+	   optionally specified number of digits.
+
+       metadata
+	   Frame metadata. Takes one or two arguments.
+
+	   The first argument is mandatory and specifies the metadata key.
+
+	   The second argument is optional and specifies a default value, used
+	   when the metadata key is not found or empty.
+
+	   Available metadata can be identified by inspecting entries starting
+	   with TAG included within each frame section printed by running
+	   "ffprobe -show_frames".
+
+	   String metadata generated in filters leading to the qrencode filter
+	   are also available.
+
+       rand(min, max)
+	   return a random number included between min and max
+
+       Examples
+
+       o   Generate a QR code encoding the specified text with the default
+	   size, overalaid in the top left corner of the input video, with the
+	   default size:
+
+		   qrencode=text=www.ffmpeg.org
+
+       o   Same as below, but select blue on pink colors:
+
+		   qrencode=text=www.ffmpeg.org:bc=pink@0.5:fc=blue
+
+       o   Place the QR code in the bottom right corner of the input video:
+
+		   qrencode=text=www.ffmpeg.org:x=W-Q:y=H-Q
+
+       o   Generate a QR code with width of 200 pixels and padding, making the
+	   padded width 4/3 of the QR code width:
+
+		   qrencode=text=www.ffmpeg.org:q=200:Q=4/3*q
+
+       o   Generate a QR code with padded width of 200 pixels and padding,
+	   making the QR code width 3/4 of the padded width:
+
+		   qrencode=text=www.ffmpeg.org:Q=200:q=3/4*Q
+
+       o   Make the QR code a fraction of the input video width:
+
+		   qrencode=text=www.ffmpeg.org:q=W/5
+
+       o   Generate a QR code encoding the frame number:
+
+		   qrencode=text=%{n}
+
+       o   Generate a QR code encoding the GMT timestamp:
+
+		   qrencode=text=%{gmtime}
+
+       o   Generate a QR code encoding the timestamp expressed as a float:
+
+		   qrencode=text=%{pts}
+
+   quirc
+       Identify and decode a QR code using the libquirc library (see
+       <https://github.com/dlbeer/quirc/>), and print the identified QR codes
+       positions and payload as metadata.
+
+       To enable the compilation of this filter, you need to configure FFmpeg
+       with "--enable-libquirc".
+
+       For each found QR code in the input video, some metadata entries are
+       added with the prefix lavfi.quirc.N, where N is the index, starting
+       from 0, associated to the QR code.
+
+       A description of each metadata value follows:
+
+       lavfi.quirc.count
+	   the number of found QR codes, it is not set in case none was found
+
+       lavfi.quirc.N.corner.M.x
+       lavfi.quirc.N.coreer.M.y
+	   the x/y positions of the four corners of the square containing the
+	   QR code, where M is the index of the corner starting from 0
+
+       lavfi.quirc.N.payload
+	   the payload of the QR code
+
+   random
+       Flush video frames from internal cache of frames into a random order.
+       No frame is discarded.  Inspired by frei0r nervous filter.
+
+       frames
+	   Set size in number of frames of internal cache, in range from 2 to
+	   512. Default is 30.
+
+       seed
+	   Set seed for random number generator, must be an integer included
+	   between 0 and "UINT32_MAX". If not specified, or if explicitly set
+	   to less than 0, the filter will try to use a good random seed on a
+	   best effort basis.
+
+   readeia608
+       Read closed captioning (EIA-608) information from the top lines of a
+       video frame.
+
+       This filter adds frame metadata for "lavfi.readeia608.X.cc" and
+       "lavfi.readeia608.X.line", where "X" is the number of the identified
+       line with EIA-608 data (starting from 0). A description of each
+       metadata value follows:
+
+       lavfi.readeia608.X.cc
+	   The two bytes stored as EIA-608 data (printed in hexadecimal).
+
+       lavfi.readeia608.X.line
+	   The number of the line on which the EIA-608 data was identified and
+	   read.
+
+       This filter accepts the following options:
+
+       scan_min
+	   Set the line to start scanning for EIA-608 data. Default is 0.
+
+       scan_max
+	   Set the line to end scanning for EIA-608 data. Default is 29.
+
+       spw Set the ratio of width reserved for sync code detection.  Default
+	   is 0.27. Allowed range is "[0.1 - 0.7]".
+
+       chp Enable checking the parity bit. In the event of a parity error, the
+	   filter will output 0x00 for that character. Default is false.
+
+       lp  Lowpass lines prior to further processing. Default is enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Output a csv with presentation time and the first two lines of
+	   identified EIA-608 captioning data.
+
+		   ffprobe -f lavfi -i movie=captioned_video.mov,readeia608 -show_entries frame=pts_time:frame_tags=lavfi.readeia608.0.cc,lavfi.readeia608.1.cc -of csv
+
+   readvitc
+       Read vertical interval timecode (VITC) information from the top lines
+       of a video frame.
+
+       The filter adds frame metadata key "lavfi.readvitc.tc_str" with the
+       timecode value, if a valid timecode has been detected. Further metadata
+       key "lavfi.readvitc.found" is set to 0/1 depending on whether timecode
+       data has been found or not.
+
+       This filter accepts the following options:
+
+       scan_max
+	   Set the maximum number of lines to scan for VITC data. If the value
+	   is set to "-1" the full video frame is scanned. Default is 45.
+
+       thr_b
+	   Set the luma threshold for black. Accepts float numbers in the
+	   range [0.0,1.0], default value is 0.2. The value must be equal or
+	   less than "thr_w".
+
+       thr_w
+	   Set the luma threshold for white. Accepts float numbers in the
+	   range [0.0,1.0], default value is 0.6. The value must be equal or
+	   greater than "thr_b".
+
+       Examples
+
+       o   Detect and draw VITC data onto the video frame; if no valid VITC is
+	   detected, draw "--:--:--:--" as a placeholder:
+
+		   ffmpeg -i input.avi -filter:v 'readvitc,drawtext=fontfile=FreeMono.ttf:text=%{metadata\\:lavfi.readvitc.tc_str\\:--\\\\\\:--\\\\\\:--\\\\\\:--}:x=(w-tw)/2:y=400-ascent'
+
+   remap
+       Remap pixels using 2nd: Xmap and 3rd: Ymap input video stream.
+
+       Destination pixel at position (X, Y) will be picked from source (x, y)
+       position where x = Xmap(X, Y) and y = Ymap(X, Y). If mapping values are
+       out of range, zero value for pixel will be used for destination pixel.
+
+       Xmap and Ymap input video streams must be of same dimensions. Output
+       video stream will have Xmap/Ymap video stream dimensions.  Xmap and
+       Ymap input video streams are 16bit depth, single channel.
+
+       format
+	   Specify pixel format of output from this filter. Can be "color" or
+	   "gray".  Default is "color".
+
+       fill
+	   Specify the color of the unmapped pixels. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+	   Default color is "black".
+
+   removegrain
+       The removegrain filter is a spatial denoiser for progressive video.
+
+       m0  Set mode for the first plane.
+
+       m1  Set mode for the second plane.
+
+       m2  Set mode for the third plane.
+
+       m3  Set mode for the fourth plane.
+
+       Range of mode is from 0 to 24. Description of each mode follows:
+
+       0   Leave input plane unchanged. Default.
+
+       1   Clips the pixel with the minimum and maximum of the 8 neighbour
+	   pixels.
+
+       2   Clips the pixel with the second minimum and maximum of the 8
+	   neighbour pixels.
+
+       3   Clips the pixel with the third minimum and maximum of the 8
+	   neighbour pixels.
+
+       4   Clips the pixel with the fourth minimum and maximum of the 8
+	   neighbour pixels.  This is equivalent to a median filter.
+
+       5   Line-sensitive clipping giving the minimal change.
+
+       6   Line-sensitive clipping, intermediate.
+
+       7   Line-sensitive clipping, intermediate.
+
+       8   Line-sensitive clipping, intermediate.
+
+       9   Line-sensitive clipping on a line where the neighbours pixels are
+	   the closest.
+
+       10  Replaces the target pixel with the closest neighbour.
+
+       11  [1 2 1] horizontal and vertical kernel blur.
+
+       12  Same as mode 11.
+
+       13  Bob mode, interpolates top field from the line where the neighbours
+	   pixels are the closest.
+
+       14  Bob mode, interpolates bottom field from the line where the
+	   neighbours pixels are the closest.
+
+       15  Bob mode, interpolates top field. Same as 13 but with a more
+	   complicated interpolation formula.
+
+       16  Bob mode, interpolates bottom field. Same as 14 but with a more
+	   complicated interpolation formula.
+
+       17  Clips the pixel with the minimum and maximum of respectively the
+	   maximum and minimum of each pair of opposite neighbour pixels.
+
+       18  Line-sensitive clipping using opposite neighbours whose greatest
+	   distance from the current pixel is minimal.
+
+       19  Replaces the pixel with the average of its 8 neighbours.
+
+       20  Averages the 9 pixels ([1 1 1] horizontal and vertical blur).
+
+       21  Clips pixels using the averages of opposite neighbour.
+
+       22  Same as mode 21 but simpler and faster.
+
+       23  Small edge and halo removal, but reputed useless.
+
+       24  Similar as 23.
+
+   removelogo
+       Suppress a TV station logo, using an image file to determine which
+       pixels comprise the logo. It works by filling in the pixels that
+       comprise the logo with neighboring pixels.
+
+       The filter accepts the following options:
+
+       filename, f
+	   Set the filter bitmap file, which can be any image format supported
+	   by libavformat. The width and height of the image file must match
+	   those of the video stream being processed.
+
+       Pixels in the provided bitmap image with a value of zero are not
+       considered part of the logo, non-zero pixels are considered part of the
+       logo. If you use white (255) for the logo and black (0) for the rest,
+       you will be safe. For making the filter bitmap, it is recommended to
+       take a screen capture of a black frame with the logo visible, and then
+       using a threshold filter followed by the erode filter once or twice.
+
+       If needed, little splotches can be fixed manually. Remember that if
+       logo pixels are not covered, the filter quality will be much reduced.
+       Marking too many pixels as part of the logo does not hurt as much, but
+       it will increase the amount of blurring needed to cover over the image
+       and will destroy more information than necessary, and extra pixels will
+       slow things down on a large logo.
+
+   repeatfields
+       This filter uses the repeat_field flag from the Video ES headers and
+       hard repeats fields based on its value.
+
+   reverse
+       Reverse a video clip.
+
+       Warning: This filter requires memory to buffer the entire clip, so
+       trimming is suggested.
+
+       Examples
+
+       o   Take the first 5 seconds of a clip, and reverse it.
+
+		   trim=end=5,reverse
+
+   rgbashift
+       Shift R/G/B/A pixels horizontally and/or vertically.
+
+       The filter accepts the following options:
+
+       rh  Set amount to shift red horizontally.
+
+       rv  Set amount to shift red vertically.
+
+       gh  Set amount to shift green horizontally.
+
+       gv  Set amount to shift green vertically.
+
+       bh  Set amount to shift blue horizontally.
+
+       bv  Set amount to shift blue vertically.
+
+       ah  Set amount to shift alpha horizontally.
+
+       av  Set amount to shift alpha vertically.
+
+       edge
+	   Set edge mode, can be smear, default, or warp.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   roberts
+       Apply roberts cross operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   rotate
+       Rotate video by an arbitrary angle expressed in radians.
+
+       The filter accepts the following options:
+
+       A description of the optional parameters follows.
+
+       angle, a
+	   Set an expression for the angle by which to rotate the input video
+	   clockwise, expressed as a number of radians. A negative value will
+	   result in a counter-clockwise rotation. By default it is set to
+	   "0".
+
+	   This expression is evaluated for each frame.
+
+       out_w, ow
+	   Set the output width expression, default value is "iw".  This
+	   expression is evaluated just once during configuration.
+
+       out_h, oh
+	   Set the output height expression, default value is "ih".  This
+	   expression is evaluated just once during configuration.
+
+       bilinear
+	   Enable bilinear interpolation if set to 1, a value of 0 disables
+	   it. Default value is 1.
+
+       fillcolor, c
+	   Set the color used to fill the output area not covered by the
+	   rotated image. For the general syntax of this option, check the
+	   "Color" section in the ffmpeg-utils manual.	If the special value
+	   "none" is selected then no background is printed (useful for
+	   example if the background is never shown).
+
+	   Default value is "black".
+
+       The expressions for the angle and the output size can contain the
+       following constants and functions:
+
+       n   sequential number of the input frame, starting from 0. It is always
+	   NAN before the first frame is filtered.
+
+       t   time in seconds of the input frame, it is set to 0 when the filter
+	   is configured. It is always NAN before the first frame is filtered.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       in_w, iw
+       in_h, ih
+	   the input video width and height
+
+       out_w, ow
+       out_h, oh
+	   the output width and height, that is the size of the padded area as
+	   specified by the width and height expressions
+
+       rotw(a)
+       roth(a)
+	   the minimal width/height required for completely containing the
+	   input video rotated by a radians.
+
+	   These are only available when computing the out_w and out_h
+	   expressions.
+
+       Examples
+
+       o   Rotate the input by PI/6 radians clockwise:
+
+		   rotate=PI/6
+
+       o   Rotate the input by PI/6 radians counter-clockwise:
+
+		   rotate=-PI/6
+
+       o   Rotate the input by 45 degrees clockwise:
+
+		   rotate=45*PI/180
+
+       o   Apply a constant rotation with period T, starting from an angle of
+	   PI/3:
+
+		   rotate=PI/3+2*PI*t/T
+
+       o   Make the input video rotation oscillating with a period of T
+	   seconds and an amplitude of A radians:
+
+		   rotate=A*sin(2*PI/T*t)
+
+       o   Rotate the video, output size is chosen so that the whole rotating
+	   input video is always completely contained in the output:
+
+		   rotate='2*PI*t:ow=hypot(iw,ih):oh=ow'
+
+       o   Rotate the video, reduce the output size so that no background is
+	   ever shown:
+
+		   rotate=2*PI*t:ow='min(iw,ih)/sqrt(2)':oh=ow:c=none
+
+       Commands
+
+       The filter supports the following commands:
+
+       a, angle
+	   Set the angle expression.  The command accepts the same syntax of
+	   the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   sab
+       Apply Shape Adaptive Blur.
+
+       The filter accepts the following options:
+
+       luma_radius, lr
+	   Set luma blur filter strength, must be a value in range 0.1-4.0,
+	   default value is 1.0. A greater value will result in a more blurred
+	   image, and in slower processing.
+
+       luma_pre_filter_radius, lpfr
+	   Set luma pre-filter radius, must be a value in the 0.1-2.0 range,
+	   default value is 1.0.
+
+       luma_strength, ls
+	   Set luma maximum difference between pixels to still be considered,
+	   must be a value in the 0.1-100.0 range, default value is 1.0.
+
+       chroma_radius, cr
+	   Set chroma blur filter strength, must be a value in range -0.9-4.0.
+	   A greater value will result in a more blurred image, and in slower
+	   processing.
+
+       chroma_pre_filter_radius, cpfr
+	   Set chroma pre-filter radius, must be a value in the -0.9-2.0
+	   range.
+
+       chroma_strength, cs
+	   Set chroma maximum difference between pixels to still be
+	   considered, must be a value in the -0.9-100.0 range.
+
+       Each chroma option value, if not explicitly specified, is set to the
+       corresponding luma option value.
+
+   scale
+       Scale (resize) the input video, using the libswscale library.
+
+       The scale filter forces the output display aspect ratio to be the same
+       of the input, by changing the output sample aspect ratio.
+
+       If the input image format is different from the format requested by the
+       next filter, the scale filter will convert the input to the requested
+       format.
+
+       Options
+
+       The filter accepts the following options, or any of the options
+       supported by the libswscale scaler.
+
+       See the ffmpeg-scaler manual for the complete list of scaler options.
+
+       width, w
+       height, h
+	   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+	   If the width or w value is 0, the input width is used for the
+	   output. If the height or h value is 0, the input height is used for
+	   the output.
+
+	   If one and only one of the values is -n with n >= 1, the scale
+	   filter will use a value that maintains the aspect ratio of the
+	   input image, calculated from the other specified dimension. After
+	   that it will, however, make sure that the calculated dimension is
+	   divisible by n and adjust the value if necessary.
+
+	   If both values are -n with n >= 1, the behavior will be identical
+	   to both values being set to 0 as previously detailed.
+
+	   See below for the list of accepted constants for use in the
+	   dimension expression.
+
+       eval
+	   Specify when to evaluate width and height expression. It accepts
+	   the following values:
+
+	   init
+	       Only evaluate expressions once during the filter initialization
+	       or when a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+	   Default value is init.
+
+       interl
+	   Set the interlacing mode. It accepts the following values:
+
+	   1   Force interlaced aware scaling.
+
+	   0   Do not apply interlaced scaling.
+
+	   -1  Select interlaced aware scaling depending on whether the source
+	       frames are flagged as interlaced or not.
+
+	   Default value is 0.
+
+       flags
+	   Set libswscale scaling flags. See the ffmpeg-scaler manual for the
+	   complete list of values. If not explicitly specified the filter
+	   applies the default flags.
+
+       param0, param1
+	   Set libswscale input parameters for scaling algorithms that need
+	   them. See the ffmpeg-scaler manual for the complete documentation.
+	   If not explicitly specified the filter applies empty parameters.
+
+       size, s
+	   Set the video size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual.
+
+       in_color_matrix
+       out_color_matrix
+	   Set in/output YCbCr color space type.
+
+	   This allows the autodetected value to be overridden as well as
+	   allows forcing a specific value used for the output and encoder.
+
+	   If not specified, the color space type depends on the pixel format.
+
+	   Possible values:
+
+	   auto
+	       Choose automatically.
+
+	   bt709
+	       Format conforming to International Telecommunication Union
+	       (ITU) Recommendation BT.709.
+
+	   fcc Set color space conforming to the United States Federal
+	       Communications Commission (FCC) Code of Federal Regulations
+	       (CFR) Title 47 (2003) 73.682 (a).
+
+	   bt601
+	   bt470
+	   smpte170m
+	       Set color space conforming to:
+
+	       o   ITU Radiocommunication Sector (ITU-R) Recommendation BT.601
+
+	       o   ITU-R Rec. BT.470-6 (1998) Systems B, B1, and G
+
+	       o   Society of Motion Picture and Television Engineers (SMPTE)
+		   ST 170:2004
+
+	   smpte240m
+	       Set color space conforming to SMPTE ST 240:1999.
+
+	   bt2020
+	       Set color space conforming to ITU-R BT.2020 non-constant
+	       luminance system.
+
+       in_range
+       out_range
+	   Set in/output YCbCr sample range.
+
+	   This allows the autodetected value to be overridden as well as
+	   allows forcing a specific value used for the output and encoder. If
+	   not specified, the range depends on the pixel format. Possible
+	   values:
+
+	   auto/unknown
+	       Choose automatically.
+
+	   jpeg/full/pc
+	       Set full range (0-255 in case of 8-bit luma).
+
+	   mpeg/limited/tv
+	       Set "MPEG" range (16-235 in case of 8-bit luma).
+
+       force_original_aspect_ratio
+	   Enable decreasing or increasing output video width or height if
+	   necessary to keep the original aspect ratio. Possible values:
+
+	   disable
+	       Scale the video as specified and disable this feature.
+
+	   decrease
+	       The output video dimensions will automatically be decreased if
+	       needed.
+
+	   increase
+	       The output video dimensions will automatically be increased if
+	       needed.
+
+	   One useful instance of this option is that when you know a specific
+	   device's maximum allowed resolution, you can use this to limit the
+	   output video to that, while retaining the aspect ratio. For
+	   example, device A allows 1280x720 playback, and your video is
+	   1920x800. Using this option (set it to decrease) and specifying
+	   1280x720 to the command line makes the output 1280x533.
+
+	   Please note that this is a different thing than specifying -1 for w
+	   or h, you still need to specify the output resolution for this
+	   option to work.
+
+       force_divisible_by
+	   Ensures that both the output dimensions, width and height, are
+	   divisible by the given integer when used together with
+	   force_original_aspect_ratio. This works similar to using "-n" in
+	   the w and h options.
+
+	   This option respects the value set for force_original_aspect_ratio,
+	   increasing or decreasing the resolution accordingly. The video's
+	   aspect ratio may be slightly modified.
+
+	   This option can be handy if you need to have a video fit within or
+	   exceed a defined resolution using force_original_aspect_ratio but
+	   also have encoder restrictions on width or height divisibility.
+
+       The values of the w and h options are expressions containing the
+       following constants:
+
+       in_w
+       in_h
+	   The input width and height
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (scaled) width and height
+
+       ow
+       oh  These are the same as out_w and out_h
+
+       a   The same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar The input display aspect ratio. Calculated from "(iw / ih) * sar".
+
+       hsub
+       vsub
+	   horizontal and vertical input chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       ohsub
+       ovsub
+	   horizontal and vertical output chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       n   The (sequential) number of the input frame, starting from 0.  Only
+	   available with "eval=frame".
+
+       t   The presentation timestamp of the input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       pos The position (byte offset) of the frame in the input stream, or NaN
+	   if this information is unavailable and/or meaningless (for example
+	   in case of synthetic video).  Only available with "eval=frame".
+	   Deprecated, do not use.
+
+       Examples
+
+       o   Scale the input video to a size of 200x100
+
+		   scale=w=200:h=100
+
+	   This is equivalent to:
+
+		   scale=200:100
+
+	   or:
+
+		   scale=200x100
+
+       o   Specify a size abbreviation for the output size:
+
+		   scale=qcif
+
+	   which can also be written as:
+
+		   scale=size=qcif
+
+       o   Scale the input to 2x:
+
+		   scale=w=2*iw:h=2*ih
+
+       o   The above is the same as:
+
+		   scale=2*in_w:2*in_h
+
+       o   Scale the input to 2x with forced interlaced scaling:
+
+		   scale=2*iw:2*ih:interl=1
+
+       o   Scale the input to half size:
+
+		   scale=w=iw/2:h=ih/2
+
+       o   Increase the width, and set the height to the same size:
+
+		   scale=3/2*iw:ow
+
+       o   Seek Greek harmony:
+
+		   scale=iw:1/PHI*iw
+		   scale=ih*PHI:ih
+
+       o   Increase the height, and set the width to 3/2 of the height:
+
+		   scale=w=3/2*oh:h=3/5*ih
+
+       o   Increase the size, making the size a multiple of the chroma
+	   subsample values:
+
+		   scale="trunc(3/2*iw/hsub)*hsub:trunc(3/2*ih/vsub)*vsub"
+
+       o   Increase the width to a maximum of 500 pixels, keeping the same
+	   aspect ratio as the input:
+
+		   scale=w='min(500\, iw*3/2):h=-1'
+
+       o   Make pixels square by combining scale and setsar:
+
+		   scale='trunc(ih*dar):ih',setsar=1/1
+
+       o   Make pixels square by combining scale and setsar, making sure the
+	   resulting resolution is even (required by some codecs):
+
+		   scale='trunc(ih*dar/2)*2:trunc(ih/2)*2',setsar=1/1
+
+       Commands
+
+       This filter supports the following commands:
+
+       width, w
+       height, h
+	   Set the output video dimension expression.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   scale_cuda
+       Scale (resize) and convert (pixel format) the input video, using
+       accelerated CUDA kernels.  Setting the output width and height works in
+       the same way as for the scale filter.
+
+       The filter accepts the following options:
+
+       w
+       h   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+	   Allows for the same expressions as the scale filter.
+
+       interp_algo
+	   Sets the algorithm used for scaling:
+
+	   nearest
+	       Nearest neighbour
+
+	       Used by default if input parameters match the desired output.
+
+	   bilinear
+	       Bilinear
+
+	   bicubic
+	       Bicubic
+
+	       This is the default.
+
+	   lanczos
+	       Lanczos
+
+       format
+	   Controls the output pixel format. By default, or if none is
+	   specified, the input pixel format is used.
+
+	   The filter does not support converting between YUV and RGB pixel
+	   formats.
+
+       passthrough
+	   If set to 0, every frame is processed, even if no conversion is
+	   necessary.  This mode can be useful to use the filter as a buffer
+	   for a downstream frame-consumer that exhausts the limited decoder
+	   frame pool.
+
+	   If set to 1, frames are passed through as-is if they match the
+	   desired output parameters. This is the default behaviour.
+
+       param
+	   Algorithm-Specific parameter.
+
+	   Affects the curves of the bicubic algorithm.
+
+       force_original_aspect_ratio
+       force_divisible_by
+	   Work the same as the identical scale filter options.
+
+       Examples
+
+       o   Scale input to 720p, keeping aspect ratio and ensuring the output
+	   is yuv420p.
+
+		   scale_cuda=-2:720:format=yuv420p
+
+       o   Upscale to 4K using nearest neighbour algorithm.
+
+		   scale_cuda=4096:2160:interp_algo=nearest
+
+       o   Don't do any conversion or scaling, but copy all input frames into
+	   newly allocated ones.  This can be useful to deal with a filter and
+	   encode chain that otherwise exhausts the decoders frame pool.
+
+		   scale_cuda=passthrough=0
+
+   scale_npp
+       Use the NVIDIA Performance Primitives (libnpp) to perform scaling
+       and/or pixel format conversion on CUDA video frames. Setting the output
+       width and height works in the same way as for the scale filter.
+
+       The following additional options are accepted:
+
+       format
+	   The pixel format of the output CUDA frames. If set to the string
+	   "same" (the default), the input format will be kept. Note that
+	   automatic format negotiation and conversion is not yet supported
+	   for hardware frames
+
+       interp_algo
+	   The interpolation algorithm used for resizing. One of the
+	   following:
+
+	   nn  Nearest neighbour.
+
+	   linear
+	   cubic
+	   cubic2p_bspline
+	       2-parameter cubic (B=1, C=0)
+
+	   cubic2p_catmullrom
+	       2-parameter cubic (B=0, C=1/2)
+
+	   cubic2p_b05c03
+	       2-parameter cubic (B=1/2, C=3/10)
+
+	   super
+	       Supersampling
+
+	   lanczos
+       force_original_aspect_ratio
+	   Enable decreasing or increasing output video width or height if
+	   necessary to keep the original aspect ratio. Possible values:
+
+	   disable
+	       Scale the video as specified and disable this feature.
+
+	   decrease
+	       The output video dimensions will automatically be decreased if
+	       needed.
+
+	   increase
+	       The output video dimensions will automatically be increased if
+	       needed.
+
+	   One useful instance of this option is that when you know a specific
+	   device's maximum allowed resolution, you can use this to limit the
+	   output video to that, while retaining the aspect ratio. For
+	   example, device A allows 1280x720 playback, and your video is
+	   1920x800. Using this option (set it to decrease) and specifying
+	   1280x720 to the command line makes the output 1280x533.
+
+	   Please note that this is a different thing than specifying -1 for w
+	   or h, you still need to specify the output resolution for this
+	   option to work.
+
+       force_divisible_by
+	   Ensures that both the output dimensions, width and height, are
+	   divisible by the given integer when used together with
+	   force_original_aspect_ratio. This works similar to using "-n" in
+	   the w and h options.
+
+	   This option respects the value set for force_original_aspect_ratio,
+	   increasing or decreasing the resolution accordingly. The video's
+	   aspect ratio may be slightly modified.
+
+	   This option can be handy if you need to have a video fit within or
+	   exceed a defined resolution using force_original_aspect_ratio but
+	   also have encoder restrictions on width or height divisibility.
+
+       eval
+	   Specify when to evaluate width and height expression. It accepts
+	   the following values:
+
+	   init
+	       Only evaluate expressions once during the filter initialization
+	       or when a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+       The values of the w and h options are expressions containing the
+       following constants:
+
+       in_w
+       in_h
+	   The input width and height
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (scaled) width and height
+
+       ow
+       oh  These are the same as out_w and out_h
+
+       a   The same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar The input display aspect ratio. Calculated from "(iw / ih) * sar".
+
+       n   The (sequential) number of the input frame, starting from 0.  Only
+	   available with "eval=frame".
+
+       t   The presentation timestamp of the input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       pos The position (byte offset) of the frame in the input stream, or NaN
+	   if this information is unavailable and/or meaningless (for example
+	   in case of synthetic video).  Only available with "eval=frame".
+	   Deprecated, do not use.
+
+   scale2ref
+       Scale (resize) the input video, based on a reference video.
+
+       See the scale filter for available options, scale2ref supports the same
+       but uses the reference video instead of the main input as basis.
+       scale2ref also supports the following additional constants for the w
+       and h options:
+
+       main_w
+       main_h
+	   The main input video's width and height
+
+       main_a
+	   The same as main_w / main_h
+
+       main_sar
+	   The main input video's sample aspect ratio
+
+       main_dar, mdar
+	   The main input video's display aspect ratio. Calculated from
+	   "(main_w / main_h) * main_sar".
+
+       main_hsub
+       main_vsub
+	   The main input video's horizontal and vertical chroma subsample
+	   values.  For example for the pixel format "yuv422p" hsub is 2 and
+	   vsub is 1.
+
+       main_n
+	   The (sequential) number of the main input frame, starting from 0.
+	   Only available with "eval=frame".
+
+       main_t
+	   The presentation timestamp of the main input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       main_pos
+	   The position (byte offset) of the frame in the main input stream,
+	   or NaN if this information is unavailable and/or meaningless (for
+	   example in case of synthetic video).  Only available with
+	   "eval=frame".
+
+       Examples
+
+       o   Scale a subtitle stream (b) to match the main video (a) in size
+	   before overlaying
+
+		   'scale2ref[b][a];[a][b]overlay'
+
+       o   Scale a logo to 1/10th the height of a video, while preserving its
+	   display aspect ratio.
+
+		   [logo-in][video-in]scale2ref=w=oh*mdar:h=ih/10[logo-out][video-out]
+
+       Commands
+
+       This filter supports the following commands:
+
+       width, w
+       height, h
+	   Set the output video dimension expression.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   scale2ref_npp
+       Use the NVIDIA Performance Primitives (libnpp) to scale (resize) the
+       input video, based on a reference video.
+
+       See the scale_npp filter for available options, scale2ref_npp supports
+       the same but uses the reference video instead of the main input as
+       basis. scale2ref_npp also supports the following additional constants
+       for the w and h options:
+
+       main_w
+       main_h
+	   The main input video's width and height
+
+       main_a
+	   The same as main_w / main_h
+
+       main_sar
+	   The main input video's sample aspect ratio
+
+       main_dar, mdar
+	   The main input video's display aspect ratio. Calculated from
+	   "(main_w / main_h) * main_sar".
+
+       main_n
+	   The (sequential) number of the main input frame, starting from 0.
+	   Only available with "eval=frame".
+
+       main_t
+	   The presentation timestamp of the main input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       main_pos
+	   The position (byte offset) of the frame in the main input stream,
+	   or NaN if this information is unavailable and/or meaningless (for
+	   example in case of synthetic video).  Only available with
+	   "eval=frame".
+
+       Examples
+
+       o   Scale a subtitle stream (b) to match the main video (a) in size
+	   before overlaying
+
+		   'scale2ref_npp[b][a];[a][b]overlay_cuda'
+
+       o   Scale a logo to 1/10th the height of a video, while preserving its
+	   display aspect ratio.
+
+		   [logo-in][video-in]scale2ref_npp=w=oh*mdar:h=ih/10[logo-out][video-out]
+
+   scale_vt
+       Scale and convert the color parameters using VTPixelTransferSession.
+
+       The filter accepts the following options:
+
+       w
+       h   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+       color_matrix
+	   Set the output colorspace matrix.
+
+       color_primaries
+	   Set the output color primaries.
+
+       color_transfer
+	   Set the output transfer characteristics.
+
+   scharr
+       Apply scharr operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   scroll
+       Scroll input video horizontally and/or vertically by constant speed.
+
+       The filter accepts the following options:
+
+       horizontal, h
+	   Set the horizontal scrolling speed. Default is 0. Allowed range is
+	   from -1 to 1.  Negative values changes scrolling direction.
+
+       vertical, v
+	   Set the vertical scrolling speed. Default is 0. Allowed range is
+	   from -1 to 1.  Negative values changes scrolling direction.
+
+       hpos
+	   Set the initial horizontal scrolling position. Default is 0.
+	   Allowed range is from 0 to 1.
+
+       vpos
+	   Set the initial vertical scrolling position. Default is 0. Allowed
+	   range is from 0 to 1.
+
+       Commands
+
+       This filter supports the following commands:
+
+       horizontal, h
+	   Set the horizontal scrolling speed.
+
+       vertical, v
+	   Set the vertical scrolling speed.
+
+   scdet
+       Detect video scene change.
+
+       This filter sets frame metadata with mafd between frame, the scene
+       score, and forward the frame to the next filter, so they can use these
+       metadata to detect scene change or others.
+
+       In addition, this filter logs a message and sets frame metadata when it
+       detects a scene change by threshold.
+
+       "lavfi.scd.mafd" metadata keys are set with mafd for every frame.
+
+       "lavfi.scd.score" metadata keys are set with scene change score for
+       every frame to detect scene change.
+
+       "lavfi.scd.time" metadata keys are set with current filtered frame time
+       which detect scene change with threshold.
+
+       The filter accepts the following options:
+
+       threshold, t
+	   Set the scene change detection threshold as a percentage of maximum
+	   change. Good values are in the "[8.0, 14.0]" range. The range for
+	   threshold is "[0., 100.]".
+
+	   Default value is 10..
+
+       sc_pass, s
+	   Set the flag to pass scene change frames to the next filter.
+	   Default value is 0 You can enable it if you want to get snapshot of
+	   scene change frames only.
+
+   selectivecolor
+       Adjust cyan, magenta, yellow and black (CMYK) to certain ranges of
+       colors (such as "reds", "yellows", "greens", "cyans", ...). The
+       adjustment range is defined by the "purity" of the color (that is, how
+       saturated it already is).
+
+       This filter is similar to the Adobe Photoshop Selective Color tool.
+
+       The filter accepts the following options:
+
+       correction_method
+	   Select color correction method.
+
+	   Available values are:
+
+	   absolute
+	       Specified adjustments are applied "as-is" (added/subtracted to
+	       original pixel component value).
+
+	   relative
+	       Specified adjustments are relative to the original component
+	       value.
+
+	   Default is "absolute".
+
+       reds
+	   Adjustments for red pixels (pixels where the red component is the
+	   maximum)
+
+       yellows
+	   Adjustments for yellow pixels (pixels where the blue component is
+	   the minimum)
+
+       greens
+	   Adjustments for green pixels (pixels where the green component is
+	   the maximum)
+
+       cyans
+	   Adjustments for cyan pixels (pixels where the red component is the
+	   minimum)
+
+       blues
+	   Adjustments for blue pixels (pixels where the blue component is the
+	   maximum)
+
+       magentas
+	   Adjustments for magenta pixels (pixels where the green component is
+	   the minimum)
+
+       whites
+	   Adjustments for white pixels (pixels where all components are
+	   greater than 128)
+
+       neutrals
+	   Adjustments for all pixels except pure black and pure white
+
+       blacks
+	   Adjustments for black pixels (pixels where all components are
+	   lesser than 128)
+
+       psfile
+	   Specify a Photoshop selective color file (".asv") to import the
+	   settings from.
+
+       All the adjustment settings (reds, yellows, ...) accept up to 4 space
+       separated floating point adjustment values in the [-1,1] range,
+       respectively to adjust the amount of cyan, magenta, yellow and black
+       for the pixels of its range.
+
+       Examples
+
+       o   Increase cyan by 50% and reduce yellow by 33% in every green areas,
+	   and increase magenta by 27% in blue areas:
+
+		   selectivecolor=greens=.5 0 -.33 0:blues=0 .27
+
+       o   Use a Photoshop selective color preset:
+
+		   selectivecolor=psfile=MySelectiveColorPresets/Misty.asv
+
+   separatefields
+       The "separatefields" takes a frame-based video input and splits each
+       frame into its components fields, producing a new half height clip with
+       twice the frame rate and twice the frame count.
+
+       This filter use field-dominance information in frame to decide which of
+       each pair of fields to place first in the output.  If it gets it wrong
+       use setfield filter before "separatefields" filter.
+
+   setdar, setsar
+       The "setdar" filter sets the Display Aspect Ratio for the filter output
+       video.
+
+       This is done by changing the specified Sample (aka Pixel) Aspect Ratio,
+       according to the following equation:
+
+	       <DAR> = <HORIZONTAL_RESOLUTION> / <VERTICAL_RESOLUTION> * <SAR>
+
+       Keep in mind that the "setdar" filter does not modify the pixel
+       dimensions of the video frame. Also, the display aspect ratio set by
+       this filter may be changed by later filters in the filterchain, e.g. in
+       case of scaling or if another "setdar" or a "setsar" filter is applied.
+
+       The "setsar" filter sets the Sample (aka Pixel) Aspect Ratio for the
+       filter output video.
+
+       Note that as a consequence of the application of this filter, the
+       output display aspect ratio will change according to the equation
+       above.
+
+       Keep in mind that the sample aspect ratio set by the "setsar" filter
+       may be changed by later filters in the filterchain, e.g. if another
+       "setsar" or a "setdar" filter is applied.
+
+       It accepts the following parameters:
+
+       r, ratio, dar ("setdar" only), sar ("setsar" only)
+	   Set the aspect ratio used by the filter.
+
+	   The parameter can be a floating point number string, or an
+	   expression. If the parameter is not specified, the value "0" is
+	   assumed, meaning that the same input value is used.
+
+       max Set the maximum integer value to use for expressing numerator and
+	   denominator when reducing the expressed aspect ratio to a rational.
+	   Default value is 100.
+
+       The parameter sar is an expression containing the following constants:
+
+       w, h
+	   The input width and height.
+
+       a   Same as w / h.
+
+       sar The input sample aspect ratio.
+
+       dar The input display aspect ratio. It is the same as (w / h) * sar.
+
+       hsub, vsub
+	   Horizontal and vertical chroma subsample values. For example, for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       Examples
+
+       o   To change the display aspect ratio to 16:9, specify one of the
+	   following:
+
+		   setdar=dar=1.77777
+		   setdar=dar=16/9
+
+       o   To change the sample aspect ratio to 10:11, specify:
+
+		   setsar=sar=10/11
+
+       o   To set a display aspect ratio of 16:9, and specify a maximum
+	   integer value of 1000 in the aspect ratio reduction, use the
+	   command:
+
+		   setdar=ratio=16/9:max=1000
+
+   setfield
+       Force field for the output video frame.
+
+       The "setfield" filter marks the interlace type field for the output
+       frames. It does not change the input frame, but only sets the
+       corresponding property, which affects how the frame is treated by
+       following filters (e.g. "fieldorder" or "yadif").
+
+       The filter accepts the following options:
+
+       mode
+	   Available values are:
+
+	   auto
+	       Keep the same field property.
+
+	   bff Mark the frame as bottom-field-first.
+
+	   tff Mark the frame as top-field-first.
+
+	   prog
+	       Mark the frame as progressive.
+
+   setparams
+       Force frame parameter for the output video frame.
+
+       The "setparams" filter marks interlace and color range for the output
+       frames. It does not change the input frame, but only sets the
+       corresponding property, which affects how the frame is treated by
+       filters/encoders.
+
+       field_mode
+	   Available values are:
+
+	   auto
+	       Keep the same field property (default).
+
+	   bff Mark the frame as bottom-field-first.
+
+	   tff Mark the frame as top-field-first.
+
+	   prog
+	       Mark the frame as progressive.
+
+       range
+	   Available values are:
+
+	   auto
+	       Keep the same color range property (default).
+
+	   unspecified, unknown
+	       Mark the frame as unspecified color range.
+
+	   limited, tv, mpeg
+	       Mark the frame as limited range.
+
+	   full, pc, jpeg
+	       Mark the frame as full range.
+
+       color_primaries
+	   Set the color primaries.  Available values are:
+
+	   auto
+	       Keep the same color primaries property (default).
+
+	   bt709
+	   unknown
+	   bt470m
+	   bt470bg
+	   smpte170m
+	   smpte240m
+	   film
+	   bt2020
+	   smpte428
+	   smpte431
+	   smpte432
+	   jedec-p22
+       color_trc
+	   Set the color transfer.  Available values are:
+
+	   auto
+	       Keep the same color trc property (default).
+
+	   bt709
+	   unknown
+	   bt470m
+	   bt470bg
+	   smpte170m
+	   smpte240m
+	   linear
+	   log100
+	   log316
+	   iec61966-2-4
+	   bt1361e
+	   iec61966-2-1
+	   bt2020-10
+	   bt2020-12
+	   smpte2084
+	   smpte428
+	   arib-std-b67
+       colorspace
+	   Set the colorspace.	Available values are:
+
+	   auto
+	       Keep the same colorspace property (default).
+
+	   gbr
+	   bt709
+	   unknown
+	   fcc
+	   bt470bg
+	   smpte170m
+	   smpte240m
+	   ycgco
+	   bt2020nc
+	   bt2020c
+	   smpte2085
+	   chroma-derived-nc
+	   chroma-derived-c
+	   ictcp
+
+   sharpen_npp
+       Use the NVIDIA Performance Primitives (libnpp) to perform image
+       sharpening with border control.
+
+       The following additional options are accepted:
+
+       border_type
+	   Type of sampling to be used ad frame borders. One of the following:
+
+	   replicate
+	       Replicate pixel values.
+
+   shear
+       Apply shear transform to input video.
+
+       This filter supports the following options:
+
+       shx Shear factor in X-direction. Default value is 0.  Allowed range is
+	   from -2 to 2.
+
+       shy Shear factor in Y-direction. Default value is 0.  Allowed range is
+	   from -2 to 2.
+
+       fillcolor, c
+	   Set the color used to fill the output area not covered by the
+	   transformed video. For the general syntax of this option, check the
+	   "Color" section in the ffmpeg-utils manual.	If the special value
+	   "none" is selected then no background is printed (useful for
+	   example if the background is never shown).
+
+	   Default value is "black".
+
+       interp
+	   Set interpolation type. Can be "bilinear" or "nearest". Default is
+	   "bilinear".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   showinfo
+       Show a line containing various information for each input video frame.
+       The input video is not modified.
+
+       This filter supports the following options:
+
+       checksum
+	   Calculate checksums of each plane. By default enabled.
+
+       udu_sei_as_ascii
+	   Try to print user data unregistered SEI as ascii character when
+	   possible, in hex format otherwise.
+
+       The shown line contains a sequence of key/value pairs of the form
+       key:value.
+
+       The following values are shown in the output:
+
+       n   The (sequential) number of the input frame, starting from 0.
+
+       pts The Presentation TimeStamp of the input frame, expressed as a
+	   number of time base units. The time base unit depends on the filter
+	   input pad.
+
+       pts_time
+	   The Presentation TimeStamp of the input frame, expressed as a
+	   number of seconds.
+
+       fmt The pixel format name.
+
+       sar The sample aspect ratio of the input frame, expressed in the form
+	   num/den.
+
+       s   The size of the input frame. For the syntax of this option, check
+	   the "Video size" section in the ffmpeg-utils manual.
+
+       i   The type of interlaced mode ("P" for "progressive", "T" for top
+	   field first, "B" for bottom field first).
+
+       iskey
+	   This is 1 if the frame is a key frame, 0 otherwise.
+
+       type
+	   The picture type of the input frame ("I" for an I-frame, "P" for a
+	   P-frame, "B" for a B-frame, or "?" for an unknown type).  Also
+	   refer to the documentation of the "AVPictureType" enum and of the
+	   "av_get_picture_type_char" function defined in libavutil/avutil.h.
+
+       checksum
+	   The Adler-32 checksum (printed in hexadecimal) of all the planes of
+	   the input frame.
+
+       plane_checksum
+	   The Adler-32 checksum (printed in hexadecimal) of each plane of the
+	   input frame, expressed in the form "[c0 c1 c2 c3]".
+
+       mean
+	   The mean value of pixels in each plane of the input frame,
+	   expressed in the form "[mean0 mean1 mean2 mean3]".
+
+       stdev
+	   The standard deviation of pixel values in each plane of the input
+	   frame, expressed in the form "[stdev0 stdev1 stdev2 stdev3]".
+
+   showpalette
+       Displays the 256 colors palette of each frame. This filter is only
+       relevant for pal8 pixel format frames.
+
+       It accepts the following option:
+
+       s   Set the size of the box used to represent one palette color entry.
+	   Default is 30 (for a "30x30" pixel box).
+
+   shuffleframes
+       Reorder and/or duplicate and/or drop video frames.
+
+       It accepts the following parameters:
+
+       mapping
+	   Set the destination indexes of input frames.  This is space or '|'
+	   separated list of indexes that maps input frames to output frames.
+	   Number of indexes also sets maximal value that each index may have.
+	   '-1' index have special meaning and that is to drop frame.
+
+       The first frame has the index 0. The default is to keep the input
+       unchanged.
+
+       Examples
+
+       o   Swap second and third frame of every three frames of the input:
+
+		   ffmpeg -i INPUT -vf "shuffleframes=0 2 1" OUTPUT
+
+       o   Swap 10th and 1st frame of every ten frames of the input:
+
+		   ffmpeg -i INPUT -vf "shuffleframes=9 1 2 3 4 5 6 7 8 0" OUTPUT
+
+   shufflepixels
+       Reorder pixels in video frames.
+
+       This filter accepts the following options:
+
+       direction, d
+	   Set shuffle direction. Can be forward or inverse direction.
+	   Default direction is forward.
+
+       mode, m
+	   Set shuffle mode. Can be horizontal, vertical or block mode.
+
+       width, w
+       height, h
+	   Set shuffle block_size. In case of horizontal shuffle mode only
+	   width part of size is used, and in case of vertical shuffle mode
+	   only height part of size is used.
+
+       seed, s
+	   Set random seed used with shuffling pixels. Mainly useful to set to
+	   be able to reverse filtering process to get original input.	For
+	   example, to reverse forward shuffle you need to use same parameters
+	   and exact same seed and to set direction to inverse.
+
+   shuffleplanes
+       Reorder and/or duplicate video planes.
+
+       It accepts the following parameters:
+
+       map0
+	   The index of the input plane to be used as the first output plane.
+
+       map1
+	   The index of the input plane to be used as the second output plane.
+
+       map2
+	   The index of the input plane to be used as the third output plane.
+
+       map3
+	   The index of the input plane to be used as the fourth output plane.
+
+       The first plane has the index 0. The default is to keep the input
+       unchanged.
+
+       Examples
+
+       o   Swap the second and third planes of the input:
+
+		   ffmpeg -i INPUT -vf shuffleplanes=0:2:1:3 OUTPUT
+
+   signalstats
+       Evaluate various visual metrics that assist in determining issues
+       associated with the digitization of analog video media.
+
+       By default the filter will log these metadata values:
+
+       YMIN
+	   Display the minimal Y value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       YLOW
+	   Display the Y value at the 10% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       YAVG
+	   Display the average Y value within the input frame. Expressed in
+	   range of [0-255].
+
+       YHIGH
+	   Display the Y value at the 90% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       YMAX
+	   Display the maximum Y value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       UMIN
+	   Display the minimal U value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       ULOW
+	   Display the U value at the 10% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       UAVG
+	   Display the average U value within the input frame. Expressed in
+	   range of [0-255].
+
+       UHIGH
+	   Display the U value at the 90% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       UMAX
+	   Display the maximum U value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       VMIN
+	   Display the minimal V value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       VLOW
+	   Display the V value at the 10% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       VAVG
+	   Display the average V value within the input frame. Expressed in
+	   range of [0-255].
+
+       VHIGH
+	   Display the V value at the 90% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       VMAX
+	   Display the maximum V value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       SATMIN
+	   Display the minimal saturation value contained within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       SATLOW
+	   Display the saturation value at the 10% percentile within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       SATAVG
+	   Display the average saturation value within the input frame.
+	   Expressed in range of [0-~181.02].
+
+       SATHIGH
+	   Display the saturation value at the 90% percentile within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       SATMAX
+	   Display the maximum saturation value contained within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       HUEMED
+	   Display the median value for hue within the input frame. Expressed
+	   in range of [0-360].
+
+       HUEAVG
+	   Display the average value for hue within the input frame. Expressed
+	   in range of [0-360].
+
+       YDIF
+	   Display the average of sample value difference between all values
+	   of the Y plane in the current frame and corresponding values of the
+	   previous input frame.  Expressed in range of [0-255].
+
+       UDIF
+	   Display the average of sample value difference between all values
+	   of the U plane in the current frame and corresponding values of the
+	   previous input frame.  Expressed in range of [0-255].
+
+       VDIF
+	   Display the average of sample value difference between all values
+	   of the V plane in the current frame and corresponding values of the
+	   previous input frame.  Expressed in range of [0-255].
+
+       YBITDEPTH
+	   Display bit depth of Y plane in current frame.  Expressed in range
+	   of [0-16].
+
+       UBITDEPTH
+	   Display bit depth of U plane in current frame.  Expressed in range
+	   of [0-16].
+
+       VBITDEPTH
+	   Display bit depth of V plane in current frame.  Expressed in range
+	   of [0-16].
+
+       The filter accepts the following options:
+
+       stat
+       out stat specify an additional form of image analysis.  out output
+	   video with the specified type of pixel highlighted.
+
+	   Both options accept the following values:
+
+	   tout
+	       Identify temporal outliers pixels. A temporal outlier is a
+	       pixel unlike the neighboring pixels of the same field. Examples
+	       of temporal outliers include the results of video dropouts,
+	       head clogs, or tape tracking issues.
+
+	   vrep
+	       Identify vertical line repetition. Vertical line repetition
+	       includes similar rows of pixels within a frame. In born-digital
+	       video vertical line repetition is common, but this pattern is
+	       uncommon in video digitized from an analog source. When it
+	       occurs in video that results from the digitization of an analog
+	       source it can indicate concealment from a dropout compensator.
+
+	   brng
+	       Identify pixels that fall outside of legal broadcast range.
+
+       color, c
+	   Set the highlight color for the out option. The default color is
+	   yellow.
+
+       Examples
+
+       o   Output data of various video metrics:
+
+		   ffprobe -f lavfi movie=example.mov,signalstats="stat=tout+vrep+brng" -show_frames
+
+       o   Output specific data about the minimum and maximum values of the Y
+	   plane per frame:
+
+		   ffprobe -f lavfi movie=example.mov,signalstats -show_entries frame_tags=lavfi.signalstats.YMAX,lavfi.signalstats.YMIN
+
+       o   Playback video while highlighting pixels that are outside of
+	   broadcast range in red.
+
+		   ffplay example.mov -vf signalstats="out=brng:color=red"
+
+       o   Playback video with signalstats metadata drawn over the frame.
+
+		   ffplay example.mov -vf signalstats=stat=brng+vrep+tout,drawtext=fontfile=FreeSerif.ttf:textfile=signalstat_drawtext.txt
+
+	   The contents of signalstat_drawtext.txt used in the command are:
+
+		   time %{pts:hms}
+		   Y (%{metadata:lavfi.signalstats.YMIN}-%{metadata:lavfi.signalstats.YMAX})
+		   U (%{metadata:lavfi.signalstats.UMIN}-%{metadata:lavfi.signalstats.UMAX})
+		   V (%{metadata:lavfi.signalstats.VMIN}-%{metadata:lavfi.signalstats.VMAX})
+		   saturation maximum: %{metadata:lavfi.signalstats.SATMAX}
+
+   signature
+       Calculates the MPEG-7 Video Signature. The filter can handle more than
+       one input. In this case the matching between the inputs can be
+       calculated additionally.  The filter always passes through the first
+       input. The signature of each stream can be written into a file.
+
+       It accepts the following options:
+
+       detectmode
+	   Enable or disable the matching process.
+
+	   Available values are:
+
+	   off Disable the calculation of a matching (default).
+
+	   full
+	       Calculate the matching for the whole video and output whether
+	       the whole video matches or only parts.
+
+	   fast
+	       Calculate only until a matching is found or the video ends.
+	       Should be faster in some cases.
+
+       nb_inputs
+	   Set the number of inputs. The option value must be a non negative
+	   integer.  Default value is 1.
+
+       filename
+	   Set the path to which the output is written. If there is more than
+	   one input, the path must be a prototype, i.e. must contain %d or
+	   %0nd (where n is a positive integer), that will be replaced with
+	   the input number. If no filename is specified, no output will be
+	   written. This is the default.
+
+       format
+	   Choose the output format.
+
+	   Available values are:
+
+	   binary
+	       Use the specified binary representation (default).
+
+	   xml Use the specified xml representation.
+
+       th_d
+	   Set threshold to detect one word as similar. The option value must
+	   be an integer greater than zero. The default value is 9000.
+
+       th_dc
+	   Set threshold to detect all words as similar. The option value must
+	   be an integer greater than zero. The default value is 60000.
+
+       th_xh
+	   Set threshold to detect frames as similar. The option value must be
+	   an integer greater than zero. The default value is 116.
+
+       th_di
+	   Set the minimum length of a sequence in frames to recognize it as
+	   matching sequence. The option value must be a non negative integer
+	   value.  The default value is 0.
+
+       th_it
+	   Set the minimum relation, that matching frames to all frames must
+	   have.  The option value must be a double value between 0 and 1. The
+	   default value is 0.5.
+
+       Examples
+
+       o   To calculate the signature of an input video and store it in
+	   signature.bin:
+
+		   ffmpeg -i input.mkv -vf signature=filename=signature.bin -map 0:v -f null -
+
+       o   To detect whether two videos match and store the signatures in XML
+	   format in signature0.xml and signature1.xml:
+
+		   ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0:v][1:v] signature=nb_inputs=2:detectmode=full:format=xml:filename=signature%d.xml" -map :v -f null -
+
+   siti
+       Calculate Spatial Information (SI) and Temporal Information (TI) scores
+       for a video, as defined in ITU-T Rec. P.910 (11/21): Subjective video
+       quality assessment methods for multimedia applications. Available PDF
+       at <https://www.itu.int/rec/T-REC-P.910-202111-S/en>.  Note that this
+       is a legacy implementation that corresponds to a superseded
+       recommendation.	Refer to ITU-T Rec. P.910 (07/22) for the latest
+       version: <https://www.itu.int/rec/T-REC-P.910-202207-I/en>
+
+       It accepts the following option:
+
+       print_summary
+	   If set to 1, Summary statistics will be printed to the console.
+	   Default 0.
+
+       Examples
+
+       o   To calculate SI/TI metrics and print summary:
+
+		   ffmpeg -i input.mp4 -vf siti=print_summary=1 -f null -
+
+   smartblur
+       Blur the input video without impacting the outlines.
+
+       It accepts the following options:
+
+       luma_radius, lr
+	   Set the luma radius. The option value must be a float number in the
+	   range [0.1,5.0] that specifies the variance of the gaussian filter
+	   used to blur the image (slower if larger). Default value is 1.0.
+
+       luma_strength, ls
+	   Set the luma strength. The option value must be a float number in
+	   the range [-1.0,1.0] that configures the blurring. A value included
+	   in [0.0,1.0] will blur the image whereas a value included in
+	   [-1.0,0.0] will sharpen the image. Default value is 1.0.
+
+       luma_threshold, lt
+	   Set the luma threshold used as a coefficient to determine whether a
+	   pixel should be blurred or not. The option value must be an integer
+	   in the range [-30,30]. A value of 0 will filter all the image, a
+	   value included in [0,30] will filter flat areas and a value
+	   included in [-30,0] will filter edges. Default value is 0.
+
+       chroma_radius, cr
+	   Set the chroma radius. The option value must be a float number in
+	   the range [0.1,5.0] that specifies the variance of the gaussian
+	   filter used to blur the image (slower if larger). Default value is
+	   luma_radius.
+
+       chroma_strength, cs
+	   Set the chroma strength. The option value must be a float number in
+	   the range [-1.0,1.0] that configures the blurring. A value included
+	   in [0.0,1.0] will blur the image whereas a value included in
+	   [-1.0,0.0] will sharpen the image. Default value is luma_strength.
+
+       chroma_threshold, ct
+	   Set the chroma threshold used as a coefficient to determine whether
+	   a pixel should be blurred or not. The option value must be an
+	   integer in the range [-30,30]. A value of 0 will filter all the
+	   image, a value included in [0,30] will filter flat areas and a
+	   value included in [-30,0] will filter edges. Default value is
+	   luma_threshold.
+
+       If a chroma option is not explicitly set, the corresponding luma value
+       is set.
+
+   sobel
+       Apply sobel operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   spp
+       Apply a simple postprocessing filter that compresses and decompresses
+       the image at several (or - in the case of quality level 6 - all) shifts
+       and average the results.
+
+       The filter accepts the following options:
+
+       quality
+	   Set quality. This option defines the number of levels for
+	   averaging. It accepts an integer in the range 0-6. If set to 0, the
+	   filter will have no effect. A value of 6 means the higher quality.
+	   For each increment of that value the speed drops by a factor of
+	   approximately 2.  Default value is 3.
+
+       qp  Force a constant quantization parameter. If not set, the filter
+	   will use the QP from the video stream (if available).
+
+       mode
+	   Set thresholding mode. Available modes are:
+
+	   hard
+	       Set hard thresholding (default).
+
+	   soft
+	       Set soft thresholding (better de-ringing effect, but likely
+	       blurrier).
+
+       use_bframe_qp
+	   Enable the use of the QP from the B-Frames if set to 1. Using this
+	   option may cause flicker since the B-Frames have often larger QP.
+	   Default is 0 (not enabled).
+
+       Commands
+
+       This filter supports the following commands:
+
+       quality, level
+	   Set quality level. The value "max" can be used to set the maximum
+	   level, currently 6.
+
+   sr
+       Scale the input by applying one of the super-resolution methods based
+       on convolutional neural networks. Supported models:
+
+       o   Super-Resolution Convolutional Neural Network model (SRCNN).  See
+	   <https://arxiv.org/abs/1501.00092>.
+
+       o   Efficient Sub-Pixel Convolutional Neural Network model (ESPCN).
+	   See <https://arxiv.org/abs/1609.05158>.
+
+       Training scripts as well as scripts for model file (.pb) saving can be
+       found at <https://github.com/XueweiMeng/sr/tree/sr_dnn_native>.
+       Original repository is at
+       <https://github.com/HighVoltageRocknRoll/sr.git>.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts the following values:
+
+	   tensorflow
+	       TensorFlow backend. To enable this backend you need to install
+	       the TensorFlow for C library (see
+	       <https://www.tensorflow.org/install/lang_c>) and configure
+	       FFmpeg with "--enable-libtensorflow"
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats. TensorFlow, OpenVINO backend can load files for only its
+	   format.
+
+       scale_factor
+	   Set scale factor for SRCNN model. Allowed values are 2, 3 and 4.
+	   Default value is 2. Scale factor is necessary for SRCNN model,
+	   because it accepts input upscaled using bicubic upscaling with
+	   proper scale factor.
+
+       To get full functionality (such as async execution), please use the
+       dnn_processing filter.
+
+   ssim
+       Obtain the SSIM (Structural SImilarity Metric) between two input
+       videos.
+
+       This filter takes in input two input videos, the first input is
+       considered the "main" source and is passed unchanged to the output. The
+       second input is used as a "reference" video for computing the SSIM.
+
+       Both video inputs must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The filter stores the calculated SSIM of each frame.
+
+       The description of the accepted parameters follows.
+
+       stats_file, f
+	   If specified the filter will use the named file to save the SSIM of
+	   each individual frame. When filename equals "-" the data is sent to
+	   standard output.
+
+       The file printed if stats_file is selected, contains a sequence of
+       key/value pairs of the form key:value for each compared couple of
+       frames.
+
+       A description of each shown parameter follows:
+
+       n   sequential number of the input frame, starting from 1
+
+       Y, U, V, R, G, B
+	   SSIM of the compared frames for the component specified by the
+	   suffix.
+
+       All SSIM of the compared frames for the whole frame.
+
+       dB  Same as above but in dB representation.
+
+       This filter also supports the framesync options.
+
+       Examples
+
+       o   For example:
+
+		   movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
+		   [main][ref] ssim="stats_file=stats.log" [out]
+
+	   On this example the input file being processed is compared with the
+	   reference file ref_movie.mpg. The SSIM of each individual frame is
+	   stored in stats.log.
+
+       o   Another example with both psnr and ssim at same time:
+
+		   ffmpeg -i main.mpg -i ref.mpg -lavfi  "ssim;[0:v][1:v]psnr" -f null -
+
+       o   Another example with different containers:
+
+		   ffmpeg -i main.mpg -i ref.mkv -lavfi  "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]ssim" -f null -
+
+   stereo3d
+       Convert between different stereoscopic image formats.
+
+       The filters accept the following options:
+
+       in  Set stereoscopic image format of input.
+
+	   Available values for input image formats are:
+
+	   sbsl
+	       side by side parallel (left eye left, right eye right)
+
+	   sbsr
+	       side by side crosseye (right eye left, left eye right)
+
+	   sbs2l
+	       side by side parallel with half width resolution (left eye
+	       left, right eye right)
+
+	   sbs2r
+	       side by side crosseye with half width resolution (right eye
+	       left, left eye right)
+
+	   abl
+	   tbl above-below (left eye above, right eye below)
+
+	   abr
+	   tbr above-below (right eye above, left eye below)
+
+	   ab2l
+	   tb2l
+	       above-below with half height resolution (left eye above, right
+	       eye below)
+
+	   ab2r
+	   tb2r
+	       above-below with half height resolution (right eye above, left
+	       eye below)
+
+	   al  alternating frames (left eye first, right eye second)
+
+	   ar  alternating frames (right eye first, left eye second)
+
+	   irl interleaved rows (left eye has top row, right eye starts on
+	       next row)
+
+	   irr interleaved rows (right eye has top row, left eye starts on
+	       next row)
+
+	   icl interleaved columns, left eye first
+
+	   icr interleaved columns, right eye first
+
+	       Default value is sbsl.
+
+       out Set stereoscopic image format of output.
+
+	   sbsl
+	       side by side parallel (left eye left, right eye right)
+
+	   sbsr
+	       side by side crosseye (right eye left, left eye right)
+
+	   sbs2l
+	       side by side parallel with half width resolution (left eye
+	       left, right eye right)
+
+	   sbs2r
+	       side by side crosseye with half width resolution (right eye
+	       left, left eye right)
+
+	   abl
+	   tbl above-below (left eye above, right eye below)
+
+	   abr
+	   tbr above-below (right eye above, left eye below)
+
+	   ab2l
+	   tb2l
+	       above-below with half height resolution (left eye above, right
+	       eye below)
+
+	   ab2r
+	   tb2r
+	       above-below with half height resolution (right eye above, left
+	       eye below)
+
+	   al  alternating frames (left eye first, right eye second)
+
+	   ar  alternating frames (right eye first, left eye second)
+
+	   irl interleaved rows (left eye has top row, right eye starts on
+	       next row)
+
+	   irr interleaved rows (right eye has top row, left eye starts on
+	       next row)
+
+	   arbg
+	       anaglyph red/blue gray (red filter on left eye, blue filter on
+	       right eye)
+
+	   argg
+	       anaglyph red/green gray (red filter on left eye, green filter
+	       on right eye)
+
+	   arcg
+	       anaglyph red/cyan gray (red filter on left eye, cyan filter on
+	       right eye)
+
+	   arch
+	       anaglyph red/cyan half colored (red filter on left eye, cyan
+	       filter on right eye)
+
+	   arcc
+	       anaglyph red/cyan color (red filter on left eye, cyan filter on
+	       right eye)
+
+	   arcd
+	       anaglyph red/cyan color optimized with the least squares
+	       projection of dubois (red filter on left eye, cyan filter on
+	       right eye)
+
+	   agmg
+	       anaglyph green/magenta gray (green filter on left eye, magenta
+	       filter on right eye)
+
+	   agmh
+	       anaglyph green/magenta half colored (green filter on left eye,
+	       magenta filter on right eye)
+
+	   agmc
+	       anaglyph green/magenta colored (green filter on left eye,
+	       magenta filter on right eye)
+
+	   agmd
+	       anaglyph green/magenta color optimized with the least squares
+	       projection of dubois (green filter on left eye, magenta filter
+	       on right eye)
+
+	   aybg
+	       anaglyph yellow/blue gray (yellow filter on left eye, blue
+	       filter on right eye)
+
+	   aybh
+	       anaglyph yellow/blue half colored (yellow filter on left eye,
+	       blue filter on right eye)
+
+	   aybc
+	       anaglyph yellow/blue colored (yellow filter on left eye, blue
+	       filter on right eye)
+
+	   aybd
+	       anaglyph yellow/blue color optimized with the least squares
+	       projection of dubois (yellow filter on left eye, blue filter on
+	       right eye)
+
+	   ml  mono output (left eye only)
+
+	   mr  mono output (right eye only)
+
+	   chl checkerboard, left eye first
+
+	   chr checkerboard, right eye first
+
+	   icl interleaved columns, left eye first
+
+	   icr interleaved columns, right eye first
+
+	   hdmi
+	       HDMI frame pack
+
+	   Default value is arcd.
+
+       Examples
+
+       o   Convert input video from side by side parallel to anaglyph
+	   yellow/blue dubois:
+
+		   stereo3d=sbsl:aybd
+
+       o   Convert input video from above below (left eye above, right eye
+	   below) to side by side crosseye.
+
+		   stereo3d=abl:sbsr
+
+   streamselect, astreamselect
+       Select video or audio streams.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of inputs. Default is 2.
+
+       map Set input indexes to remap to outputs.
+
+       Commands
+
+       The "streamselect" and "astreamselect" filter supports the following
+       commands:
+
+       map Set input indexes to remap to outputs.
+
+       Examples
+
+       o   Select first 5 seconds 1st stream and rest of time 2nd stream:
+
+		   sendcmd='5.0 streamselect map 1',streamselect=inputs=2:map=0
+
+       o   Same as above, but for audio:
+
+		   asendcmd='5.0 astreamselect map 1',astreamselect=inputs=2:map=0
+
+   subtitles
+       Draw subtitles on top of input video using the libass library.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libass". This filter also requires a build with libavcodec
+       and libavformat to convert the passed subtitles file to ASS (Advanced
+       Substation Alpha) subtitles format.
+
+       The filter accepts the following options:
+
+       filename, f
+	   Set the filename of the subtitle file to read. It must be
+	   specified.
+
+       original_size
+	   Specify the size of the original video, the video for which the ASS
+	   file was composed. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual.  Due to a misdesign in
+	   ASS aspect ratio arithmetic, this is necessary to correctly scale
+	   the fonts if the aspect ratio has been changed.
+
+       fontsdir
+	   Set a directory path containing fonts that can be used by the
+	   filter.  These fonts will be used in addition to whatever the font
+	   provider uses.
+
+       alpha
+	   Process alpha channel, by default alpha channel is untouched.
+
+       charenc
+	   Set subtitles input character encoding. "subtitles" filter only.
+	   Only useful if not UTF-8.
+
+       stream_index, si
+	   Set subtitles stream index. "subtitles" filter only.
+
+       force_style
+	   Override default style or script info parameters of the subtitles.
+	   It accepts a string containing ASS style format "KEY=VALUE" couples
+	   separated by ",".
+
+       wrap_unicode
+	   Break lines according to the Unicode Line Breaking Algorithm.
+	   Availability requires at least libass release 0.17.0 (or
+	   LIBASS_VERSION 0x01600010), and libass must have been built with
+	   libunibreak.
+
+	   The option is enabled by default except for native ASS.
+
+       If the first key is not specified, it is assumed that the first value
+       specifies the filename.
+
+       For example, to render the file sub.srt on top of the input video, use
+       the command:
+
+	       subtitles=sub.srt
+
+       which is equivalent to:
+
+	       subtitles=filename=sub.srt
+
+       To render the default subtitles stream from file video.mkv, use:
+
+	       subtitles=video.mkv
+
+       To render the second subtitles stream from that file, use:
+
+	       subtitles=video.mkv:si=1
+
+       To make the subtitles stream from sub.srt appear in 80% transparent
+       blue "DejaVu Serif", use:
+
+	       subtitles=sub.srt:force_style='Fontname=DejaVu Serif,PrimaryColour=&HCCFF0000'
+
+   super2xsai
+       Scale the input by 2x and smooth using the Super2xSaI (Scale and
+       Interpolate) pixel art scaling algorithm.
+
+       Useful for enlarging pixel art images without reducing sharpness.
+
+   swaprect
+       Swap two rectangular objects in video.
+
+       This filter accepts the following options:
+
+       w   Set object width.
+
+       h   Set object height.
+
+       x1  Set 1st rect x coordinate.
+
+       y1  Set 1st rect y coordinate.
+
+       x2  Set 2nd rect x coordinate.
+
+       y2  Set 2nd rect y coordinate.
+
+	   All expressions are evaluated once for each frame.
+
+       The all options are expressions containing the following constants:
+
+       w
+       h   The input width and height.
+
+       a   same as w / h
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (w / h) * sar
+
+       n   The number of the input frame, starting from 0.
+
+       t   The timestamp expressed in seconds. It's NAN if the input timestamp
+	   is unknown.
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   swapuv
+       Swap U & V plane.
+
+   tblend
+       Blend successive video frames.
+
+       See blend
+
+   telecine
+       Apply telecine process to the video.
+
+       This filter accepts the following options:
+
+       first_field
+	   top, t
+	       top field first
+
+	   bottom, b
+	       bottom field first The default value is "top".
+
+       pattern
+	   A string of numbers representing the pulldown pattern you wish to
+	   apply.  The default value is 23.
+
+	       Some typical patterns:
+
+	       NTSC output (30i):
+	       27.5p: 32222
+	       24p: 23 (classic)
+	       24p: 2332 (preferred)
+	       20p: 33
+	       18p: 334
+	       16p: 3444
+
+	       PAL output (25i):
+	       27.5p: 12222
+	       24p: 222222222223 ("Euro pulldown")
+	       16.67p: 33
+	       16p: 33333334
+
+   thistogram
+       Compute and draw a color distribution histogram for the input video
+       across time.
+
+       Unlike histogram video filter which only shows histogram of single
+       input frame at certain time, this filter shows also past histograms of
+       number of frames defined by "width" option.
+
+       The computed histogram is a representation of the color component
+       distribution in an image.
+
+       The filter accepts the following options:
+
+       width, w
+	   Set width of single color component output. Default value is 0.
+	   Value of 0 means width will be picked from input video.  This also
+	   set number of passed histograms to keep.  Allowed range is [0,
+	   8192].
+
+       display_mode, d
+	   Set display mode.  It accepts the following values:
+
+	   stack
+	       Per color component graphs are placed below each other.
+
+	   parade
+	       Per color component graphs are placed side by side.
+
+	   overlay
+	       Presents information identical to that in the "parade", except
+	       that the graphs representing color components are superimposed
+	       directly over one another.
+
+	   Default is "stack".
+
+       levels_mode, m
+	   Set mode. Can be either "linear", or "logarithmic".	Default is
+	   "linear".
+
+       components, c
+	   Set what color components to display.  Default is 7.
+
+       bgopacity, b
+	   Set background opacity. Default is 0.9.
+
+       envelope, e
+	   Show envelope. Default is disabled.
+
+       ecolor, ec
+	   Set envelope color. Default is "gold".
+
+       slide
+	   Set slide mode.
+
+	   Available values for slide is:
+
+	   frame
+	       Draw new frame when right border is reached.
+
+	   replace
+	       Replace old columns with new ones.
+
+	   scroll
+	       Scroll from right to left.
+
+	   rscroll
+	       Scroll from left to right.
+
+	   picture
+	       Draw single picture.
+
+	   Default is "replace".
+
+   threshold
+       Apply threshold effect to video stream.
+
+       This filter needs four video streams to perform thresholding.  First
+       stream is stream we are filtering.  Second stream is holding threshold
+       values, third stream is holding min values, and last, fourth stream is
+       holding max values.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       For example if first stream pixel's component value is less then
+       threshold value of pixel component from 2nd threshold stream, third
+       stream value will picked, otherwise fourth stream pixel component value
+       will be picked.
+
+       Using color source filter one can perform various types of
+       thresholding:
+
+       Commands
+
+       This filter supports the all options as commands.
+
+       Examples
+
+       o   Binary threshold, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=black -f lavfi -i color=white -lavfi threshold output.avi
+
+       o   Inverted binary threshold, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=white -f lavfi -i color=black -lavfi threshold output.avi
+
+       o   Truncate binary threshold, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -i 320x240.avi -f lavfi -i color=gray -lavfi threshold output.avi
+
+       o   Threshold to zero, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=white -i 320x240.avi -lavfi threshold output.avi
+
+       o   Inverted threshold to zero, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -i 320x240.avi -f lavfi -i color=white -lavfi threshold output.avi
+
+   thumbnail
+       Select the most representative frame in a given sequence of consecutive
+       frames.
+
+       The filter accepts the following options:
+
+       n   Set the frames batch size to analyze; in a set of n frames, the
+	   filter will pick one of them, and then handle the next batch of n
+	   frames until the end. Default is 100.
+
+       log Set the log level to display picked frame stats.  Default is
+	   "info".
+
+       Since the filter keeps track of the whole frames sequence, a bigger n
+       value will result in a higher memory usage, so a high value is not
+       recommended.
+
+       Examples
+
+       o   Extract one picture each 50 frames:
+
+		   thumbnail=50
+
+       o   Complete example of a thumbnail creation with ffmpeg:
+
+		   ffmpeg -i in.avi -vf thumbnail,scale=300:200 -frames:v 1 out.png
+
+   tile
+       Tile several successive frames together.
+
+       The untile filter can do the reverse.
+
+       The filter accepts the following options:
+
+       layout
+	   Set the grid size in the form "COLUMNSxROWS". Range is up to
+	   UINT_MAX cells.  Default is "6x5".
+
+       nb_frames
+	   Set the maximum number of frames to render in the given area. It
+	   must be less than or equal to wxh. The default value is 0, meaning
+	   all the area will be used.
+
+       margin
+	   Set the outer border margin in pixels. Range is 0 to 1024. Default
+	   is 0.
+
+       padding
+	   Set the inner border thickness (i.e. the number of pixels between
+	   frames). For more advanced padding options (such as having
+	   different values for the edges), refer to the pad video filter.
+	   Range is 0 to 1024. Default is 0.
+
+       color
+	   Specify the color of the unused area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.  The
+	   default value of color is "black".
+
+       overlap
+	   Set the number of frames to overlap when tiling several successive
+	   frames together.  The value must be between 0 and nb_frames - 1.
+	   Default is 0.
+
+       init_padding
+	   Set the number of frames to initially be empty before displaying
+	   first output frame.	This controls how soon will one get first
+	   output frame.  The value must be between 0 and nb_frames - 1.
+	   Default is 0.
+
+       Examples
+
+       o   Produce 8x8 PNG tiles of all keyframes (-skip_frame nokey) in a
+	   movie:
+
+		   ffmpeg -skip_frame nokey -i file.avi -vf 'scale=128:72,tile=8x8' -an -vsync 0 keyframes%03d.png
+
+	   The -vsync 0 is necessary to prevent ffmpeg from duplicating each
+	   output frame to accommodate the originally detected frame rate.
+
+       o   Display 5 pictures in an area of "3x2" frames, with 7 pixels
+	   between them, and 2 pixels of initial margin, using mixed flat and
+	   named options:
+
+		   tile=3x2:nb_frames=5:padding=7:margin=2
+
+   tiltandshift
+       What happens when you invert time and space?
+
+       Normally a video is composed of several frames that represent a
+       different instant of time and shows a scence that evolves in the space
+       captured by the frame. This filter is the antipode of that concept,
+       taking inspiration by tilt and shift photography.
+
+       A filtered frame contains the whole timeline of events composing the
+       sequence, and this is obtained by placing a slice of pixels from each
+       frame into a single one. However, since there are no infinite-width
+       frames, this is done up the width of the input frame, and a video is
+       recomposed by shifting away one column for each subsequent frame. In
+       order to map space to time, the filter tilts each input frame as well,
+       so that motion is preseved. This is accomplished by progressively
+       selecting a different column from each input frame.
+
+       The end result is a sort of inverted parralax, so that far away objects
+       move much faster that the ones in the front. The ideal conditions for
+       this video effect are when there is either very little motion and the
+       backgroud is static, or when there is a lot of motion and a very wide
+       depth of field (eg. wide panorama, while moving on a train).
+
+       The filter accepts the following parameters:
+
+       tilt
+	   Tilt video while shifting (default). When unset, video will be
+	   sliding a static image, composed of the first column of each frame.
+
+       start
+	   What to do at the start of filtering (see below).
+
+       end What to do at the end of filtering (see below).
+
+       hold
+	   How many columns should pass through before start of filtering.
+
+       pad How many columns should be inserted before end of filtering.
+
+       Normally the filter shifts and tils from the very first frame, and
+       stops when the last one is received. However, before filtering starts,
+       normal video may be preseved, so that the effect is slowly shifted in
+       its place. Similarly, the last video frame may be reconstructed at the
+       end. Alternatively it is possible to just start and end with black.
+
+       none
+	   Filtering is starts immediately and ends when the last frame is
+	   received.
+
+       frame
+	   The first frames or the very last frame are kept intact during
+	   processing.
+
+       black
+	   Black is padded at the beginning or at the end of filtering.
+
+   tinterlace
+       Perform various types of temporal field interlacing.
+
+       Frames are counted starting from 1, so the first input frame is
+       considered odd.
+
+       The filter accepts the following options:
+
+       mode
+	   Specify the mode of the interlacing. This option can also be
+	   specified as a value alone. See below for a list of values for this
+	   option.
+
+	   Available values are:
+
+	   merge, 0
+	       Move odd frames into the upper field, even into the lower
+	       field, generating a double height frame at half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+
+	   drop_even, 1
+	       Only output odd frames, even frames are dropped, generating a
+	       frame with unchanged height at half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111			       33333
+		       11111			       33333
+		       11111			       33333
+		       11111			       33333
+
+	   drop_odd, 2
+	       Only output even frames, odd frames are dropped, generating a
+	       frame with unchanged height at half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+				       22222			       44444
+				       22222			       44444
+				       22222			       44444
+				       22222			       44444
+
+	   pad, 3
+	       Expand each frame to full height, but pad alternate lines with
+	       black, generating a frame with double height at the same input
+	       frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+
+	   interleave_top, 4
+	       Interleave the upper field from odd frames with the lower field
+	       from even frames, generating a frame with unchanged height at
+	       half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111<-	       22222	       33333<-	       44444
+		       11111	       22222<-	       33333	       44444<-
+		       11111<-	       22222	       33333<-	       44444
+		       11111	       22222<-	       33333	       44444<-
+
+		       Output:
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+
+	   interleave_bottom, 5
+	       Interleave the lower field from odd frames with the upper field
+	       from even frames, generating a frame with unchanged height at
+	       half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222<-	       33333	       44444<-
+		       11111<-	       22222	       33333<-	       44444
+		       11111	       22222<-	       33333	       44444<-
+		       11111<-	       22222	       33333<-	       44444
+
+		       Output:
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+
+	   interlacex2, 6
+	       Double frame rate with unchanged height. Frames are inserted
+	       each containing the second temporal field from the previous
+	       input frame and the first temporal field from the next input
+	       frame. This mode relies on the top_field_first flag. Useful for
+	       interlaced video displays with no field synchronisation.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+			11111		22222		33333		44444
+		       11111	       22222	       33333	       44444
+			11111		22222		33333		44444
+
+		       Output:
+		       11111   22222   22222   33333   33333   44444   44444
+			11111	11111	22222	22222	33333	33333	44444
+		       11111   22222   22222   33333   33333   44444   44444
+			11111	11111	22222	22222	33333	33333	44444
+
+	   mergex2, 7
+	       Move odd frames into the upper field, even into the lower
+	       field, generating a double height frame at same frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+
+	   Numeric values are deprecated but are accepted for backward
+	   compatibility reasons.
+
+	   Default mode is "merge".
+
+       flags
+	   Specify flags influencing the filter process.
+
+	   Available value for flags is:
+
+	   low_pass_filter, vlpf
+	       Enable linear vertical low-pass filtering in the filter.
+	       Vertical low-pass filtering is required when creating an
+	       interlaced destination from a progressive source which contains
+	       high-frequency vertical detail. Filtering will reduce interlace
+	       'twitter' and Moire patterning.
+
+	   complex_filter, cvlpf
+	       Enable complex vertical low-pass filtering.  This will slightly
+	       less reduce interlace 'twitter' and Moire patterning but better
+	       retain detail and subjective sharpness impression.
+
+	   bypass_il
+	       Bypass already interlaced frames, only adjust the frame rate.
+
+	   Vertical low-pass filtering and bypassing already interlaced frames
+	   can only be enabled for mode interleave_top and interleave_bottom.
+
+   tmedian
+       Pick median pixels from several successive input video frames.
+
+       The filter accepts the following options:
+
+       radius
+	   Set radius of median filter.  Default is 1. Allowed range is from 1
+	   to 127.
+
+       planes
+	   Set which planes to filter. Default value is 15, by which all
+	   planes are processed.
+
+       percentile
+	   Set median percentile. Default value is 0.5.  Default value of 0.5
+	   will pick always median values, while 0 will pick minimum values,
+	   and 1 maximum values.
+
+       Commands
+
+       This filter supports all above options as commands, excluding option
+       "radius".
+
+   tmidequalizer
+       Apply Temporal Midway Video Equalization effect.
+
+       Midway Video Equalization adjusts a sequence of video frames to have
+       the same histograms, while maintaining their dynamics as much as
+       possible. It's useful for e.g. matching exposures from a video frames
+       sequence.
+
+       This filter accepts the following option:
+
+       radius
+	   Set filtering radius. Default is 5. Allowed range is from 1 to 127.
+
+       sigma
+	   Set filtering sigma. Default is 0.5. This controls strength of
+	   filtering.  Setting this option to 0 effectively does nothing.
+
+       planes
+	   Set which planes to process. Default is 15, which is all available
+	   planes.
+
+   tmix
+       Mix successive video frames.
+
+       A description of the accepted options follows.
+
+       frames
+	   The number of successive frames to mix. If unspecified, it defaults
+	   to 3.
+
+       weights
+	   Specify weight of each input video frame.  Each weight is separated
+	   by space. If number of weights is smaller than number of frames
+	   last specified weight will be used for all remaining unset weights.
+
+       scale
+	   Specify scale, if it is set it will be multiplied with sum of each
+	   weight multiplied with pixel values to give final destination pixel
+	   value. By default scale is auto scaled to sum of weights.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       Examples
+
+       o   Average 7 successive frames:
+
+		   tmix=frames=7:weights="1 1 1 1 1 1 1"
+
+       o   Apply simple temporal convolution:
+
+		   tmix=frames=3:weights="-1 3 -1"
+
+       o   Similar as above but only showing temporal differences:
+
+		   tmix=frames=3:weights="-1 2 -1":scale=1
+
+       Commands
+
+       This filter supports the following commands:
+
+       weights
+       scale
+       planes
+	   Syntax is same as option with same name.
+
+   tonemap
+       Tone map colors from different dynamic ranges.
+
+       This filter expects data in single precision floating point, as it
+       needs to operate on (and can output) out-of-range values. Another
+       filter, such as zscale, is needed to convert the resulting frame to a
+       usable format.
+
+       The tonemapping algorithms implemented only work on linear light, so
+       input data should be linearized beforehand (and possibly correctly
+       tagged).
+
+	       ffmpeg -i INPUT -vf zscale=transfer=linear,tonemap=clip,zscale=transfer=bt709,format=yuv420p OUTPUT
+
+       Options
+
+       The filter accepts the following options.
+
+       tonemap
+	   Set the tone map algorithm to use.
+
+	   Possible values are:
+
+	   none
+	       Do not apply any tone map, only desaturate overbright pixels.
+
+	   clip
+	       Hard-clip any out-of-range values. Use it for perfect color
+	       accuracy for in-range values, while distorting out-of-range
+	       values.
+
+	   linear
+	       Stretch the entire reference gamut to a linear multiple of the
+	       display.
+
+	   gamma
+	       Fit a logarithmic transfer between the tone curves.
+
+	   reinhard
+	       Preserve overall image brightness with a simple curve, using
+	       nonlinear contrast, which results in flattening details and
+	       degrading color accuracy.
+
+	   hable
+	       Preserve both dark and bright details better than reinhard, at
+	       the cost of slightly darkening everything. Use it when detail
+	       preservation is more important than color and brightness
+	       accuracy.
+
+	   mobius
+	       Smoothly map out-of-range values, while retaining contrast and
+	       colors for in-range material as much as possible. Use it when
+	       color accuracy is more important than detail preservation.
+
+	   Default is none.
+
+       param
+	   Tune the tone mapping algorithm.
+
+	   This affects the following algorithms:
+
+	   none
+	       Ignored.
+
+	   linear
+	       Specifies the scale factor to use while stretching.  Default to
+	       1.0.
+
+	   gamma
+	       Specifies the exponent of the function.	Default to 1.8.
+
+	   clip
+	       Specify an extra linear coefficient to multiply into the signal
+	       before clipping.  Default to 1.0.
+
+	   reinhard
+	       Specify the local contrast coefficient at the display peak.
+	       Default to 0.5, which means that in-gamut values will be about
+	       half as bright as when clipping.
+
+	   hable
+	       Ignored.
+
+	   mobius
+	       Specify the transition point from linear to mobius transform.
+	       Every value below this point is guaranteed to be mapped 1:1.
+	       The higher the value, the more accurate the result will be, at
+	       the cost of losing bright details.  Default to 0.3, which due
+	       to the steep initial slope still preserves in-range colors
+	       fairly accurately.
+
+       desat
+	   Apply desaturation for highlights that exceed this level of
+	   brightness. The higher the parameter, the more color information
+	   will be preserved. This setting helps prevent unnaturally blown-out
+	   colors for super-highlights, by (smoothly) turning into white
+	   instead. This makes images feel more natural, at the cost of
+	   reducing information about out-of-range colors.
+
+	   The default of 2.0 is somewhat conservative and will mostly just
+	   apply to skies or directly sunlit surfaces. A setting of 0.0
+	   disables this option.
+
+	   This option works only if the input frame has a supported color
+	   tag.
+
+       peak
+	   Override signal/nominal/reference peak with this value. Useful when
+	   the embedded peak information in display metadata is not reliable
+	   or when tone mapping from a lower range to a higher range.
+
+   tpad
+       Temporarily pad video frames.
+
+       The filter accepts the following options:
+
+       start
+	   Specify number of delay frames before input video stream. Default
+	   is 0.
+
+       stop
+	   Specify number of padding frames after input video stream.  Set to
+	   -1 to pad indefinitely. Default is 0.
+
+       start_mode
+	   Set kind of frames added to beginning of stream.  Can be either add
+	   or clone.  With add frames of solid-color are added.  With clone
+	   frames are clones of first frame.  Default is add.
+
+       stop_mode
+	   Set kind of frames added to end of stream.  Can be either add or
+	   clone.  With add frames of solid-color are added.  With clone
+	   frames are clones of last frame.  Default is add.
+
+       start_duration, stop_duration
+	   Specify the duration of the start/stop delay. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+	   These options override start and stop. Default is 0.
+
+       color
+	   Specify the color of the padded area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of color is "black".
+
+   transpose
+       Transpose rows with columns in the input video and optionally flip it.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   0, 4, cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip
+	       (default), that is:
+
+		       L.R     L.l
+		       . . ->  . .
+		       l.r     R.r
+
+	   1, 5, clock
+	       Rotate by 90 degrees clockwise, that is:
+
+		       L.R     l.L
+		       . . ->  . .
+		       l.r     r.R
+
+	   2, 6, cclock
+	       Rotate by 90 degrees counterclockwise, that is:
+
+		       L.R     R.r
+		       . . ->  . .
+		       l.r     L.l
+
+	   3, 7, clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip, that is:
+
+		       L.R     r.R
+		       . . ->  . .
+		       l.r     l.L
+
+	   For values between 4-7, the transposition is only done if the input
+	   video geometry is portrait and not landscape. These values are
+	   deprecated, the "passthrough" option should be used instead.
+
+	   Numerical values are deprecated, and should be dropped in favor of
+	   symbolic constants.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition.
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+	   Default value is "none".
+
+       For example to rotate by 90 degrees clockwise and preserve portrait
+       layout:
+
+	       transpose=dir=1:passthrough=portrait
+
+       The command above can also be specified as:
+
+	       transpose=1:portrait
+
+   transpose_npp
+       Transpose rows with columns in the input video and optionally flip it.
+       For more in depth examples see the transpose video filter, which shares
+       mostly the same options.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip.
+	       (default)
+
+	   clock
+	       Rotate by 90 degrees clockwise.
+
+	   cclock
+	       Rotate by 90 degrees counterclockwise.
+
+	   clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition. (default)
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+   trim
+       Trim the input so that the output contains one continuous subpart of
+       the input.
+
+       It accepts the following parameters:
+
+       start
+	   Specify the time of the start of the kept section, i.e. the frame
+	   with the timestamp start will be the first frame in the output.
+
+       end Specify the time of the first frame that will be dropped, i.e. the
+	   frame immediately preceding the one with the timestamp end will be
+	   the last frame in the output.
+
+       start_pts
+	   This is the same as start, except this option sets the start
+	   timestamp in timebase units instead of seconds.
+
+       end_pts
+	   This is the same as end, except this option sets the end timestamp
+	   in timebase units instead of seconds.
+
+       duration
+	   The maximum duration of the output in seconds.
+
+       start_frame
+	   The number of the first frame that should be passed to the output.
+
+       end_frame
+	   The number of the first frame that should be dropped.
+
+       start, end, and duration are expressed as time duration specifications;
+       see the Time duration section in the ffmpeg-utils(1) manual for the
+       accepted syntax.
+
+       Note that the first two sets of the start/end options and the duration
+       option look at the frame timestamp, while the _frame variants simply
+       count the frames that pass through the filter. Also note that this
+       filter does not modify the timestamps. If you wish for the output
+       timestamps to start at zero, insert a setpts filter after the trim
+       filter.
+
+       If multiple start or end options are set, this filter tries to be
+       greedy and keep all the frames that match at least one of the specified
+       constraints. To keep only the part that matches all the constraints at
+       once, chain multiple trim filters.
+
+       The defaults are such that all the input is kept. So it is possible to
+       set e.g.  just the end values to keep everything before the specified
+       time.
+
+       Examples:
+
+       o   Drop everything except the second minute of input:
+
+		   ffmpeg -i INPUT -vf trim=60:120
+
+       o   Keep only the first second:
+
+		   ffmpeg -i INPUT -vf trim=duration=1
+
+   unpremultiply
+       Apply alpha unpremultiply effect to input video stream using first
+       plane of second stream as alpha.
+
+       Both streams must have same dimensions and same pixel format.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+	   If the format has 1 or 2 components, then luma is bit 0.  If the
+	   format has 3 or 4 components: for RGB formats bit 0 is green, bit 1
+	   is blue and bit 2 is red; for YUV formats bit 0 is luma, bit 1 is
+	   chroma-U and bit 2 is chroma-V.  If present, the alpha channel is
+	   always the last bit.
+
+       inplace
+	   Do not require 2nd input for processing, instead use alpha plane
+	   from input stream.
+
+   unsharp
+       Sharpen or blur the input video.
+
+       It accepts the following parameters:
+
+       luma_msize_x, lx
+	   Set the luma matrix horizontal size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       luma_msize_y, ly
+	   Set the luma matrix vertical size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       luma_amount, la
+	   Set the luma effect strength. It must be a floating point number,
+	   reasonable values lay between -1.5 and 1.5.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+	   Default value is 1.0.
+
+       chroma_msize_x, cx
+	   Set the chroma matrix horizontal size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       chroma_msize_y, cy
+	   Set the chroma matrix vertical size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       chroma_amount, ca
+	   Set the chroma effect strength. It must be a floating point number,
+	   reasonable values lay between -1.5 and 1.5.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+	   Default value is 0.0.
+
+       alpha_msize_x, ax
+	   Set the alpha matrix horizontal size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       alpha_msize_y, ay
+	   Set the alpha matrix vertical size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       alpha_amount, aa
+	   Set the alpha effect strength. It must be a floating point number,
+	   reasonable values lay between -1.5 and 1.5.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+	   Default value is 0.0.
+
+       All parameters are optional and default to the equivalent of the string
+       '5:5:1.0:5:5:0.0'.
+
+       Examples
+
+       o   Apply strong luma sharpen effect:
+
+		   unsharp=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5
+
+       o   Apply a strong blur of both luma and chroma parameters:
+
+		   unsharp=7:7:-2:7:7:-2
+
+   untile
+       Decompose a video made of tiled images into the individual images.
+
+       The frame rate of the output video is the frame rate of the input video
+       multiplied by the number of tiles.
+
+       This filter does the reverse of tile.
+
+       The filter accepts the following options:
+
+       layout
+	   Set the grid size (i.e. the number of lines and columns). For the
+	   syntax of this option, check the "Video size" section in the
+	   ffmpeg-utils manual.
+
+       Examples
+
+       o   Produce a 1-second video from a still image file made of 25 frames
+	   stacked vertically, like an analogic film reel:
+
+		   ffmpeg -r 1 -i image.jpg -vf untile=1x25 movie.mkv
+
+   uspp
+       Apply ultra slow/simple postprocessing filter that compresses and
+       decompresses the image at several (or - in the case of quality level 8
+       - all) shifts and average the results.
+
+       The way this differs from the behavior of spp is that uspp actually
+       encodes & decodes each case with libavcodec Snow, whereas spp uses a
+       simplified intra only 8x8 DCT similar to MJPEG.
+
+       This filter is only available in ffmpeg version 4.4 or earlier.
+
+       The filter accepts the following options:
+
+       quality
+	   Set quality. This option defines the number of levels for
+	   averaging. It accepts an integer in the range 0-8. If set to 0, the
+	   filter will have no effect. A value of 8 means the higher quality.
+	   For each increment of that value the speed drops by a factor of
+	   approximately 2.  Default value is 3.
+
+       qp  Force a constant quantization parameter. If not set, the filter
+	   will use the QP from the video stream (if available).
+
+       codec
+	   Use specified codec instead of snow.
+
+   v360
+       Convert 360 videos between various formats.
+
+       The filter accepts the following options:
+
+       input
+       output
+	   Set format of the input/output video.
+
+	   Available formats:
+
+	   e
+	   equirect
+	       Equirectangular projection.
+
+	   c3x2
+	   c6x1
+	   c1x6
+	       Cubemap with 3x2/6x1/1x6 layout.
+
+	       Format specific options:
+
+	       in_pad
+	       out_pad
+		   Set padding proportion for the input/output cubemap. Values
+		   in decimals.
+
+		   Example values:
+
+		   0   No padding.
+
+		   0.01
+		       1% of face is padding. For example, with 1920x1280
+		       resolution face size would be 640x640 and padding would
+		       be 3 pixels from each side. (640 * 0.01 = 6 pixels)
+
+		   Default value is @samp{0}.  Maximum value is @samp{0.1}.
+
+	       fin_pad
+	       fout_pad
+		   Set fixed padding for the input/output cubemap. Values in
+		   pixels.
+
+		   Default value is @samp{0}. If greater than zero it
+		   overrides other padding options.
+
+	       in_forder
+	       out_forder
+		   Set order of faces for the input/output cubemap. Choose one
+		   direction for each position.
+
+		   Designation of directions:
+
+		   r   right
+
+		   l   left
+
+		   u   up
+
+		   d   down
+
+		   f   forward
+
+		   b   back
+
+		   Default value is @samp{rludfb}.
+
+	       in_frot
+	       out_frot
+		   Set rotation of faces for the input/output cubemap. Choose
+		   one angle for each position.
+
+		   Designation of angles:
+
+		   0   0 degrees clockwise
+
+		   1   90 degrees clockwise
+
+		   2   180 degrees clockwise
+
+		   3   270 degrees clockwise
+
+		   Default value is @samp{000000}.
+
+	   eac Equi-Angular Cubemap.
+
+	   flat
+	   gnomonic
+	   rectilinear
+	       Regular video.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   dfisheye
+	       Dual fisheye.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   barrel
+	   fb
+	   barrelsplit
+	       Facebook's 360 formats.
+
+	   sg  Stereographic format.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   mercator
+	       Mercator format.
+
+	   ball
+	       Ball format, gives significant distortion toward the back.
+
+	   hammer
+	       Hammer-Aitoff map projection format.
+
+	   sinusoidal
+	       Sinusoidal map projection format.
+
+	   fisheye
+	       Fisheye projection.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   pannini
+	       Pannini projection.
+
+	       Format specific options:
+
+	       h_fov
+		   Set output pannini parameter.
+
+	       ih_fov
+		   Set input pannini parameter.
+
+	   cylindrical
+	       Cylindrical projection.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   perspective
+	       Perspective projection. (output only)
+
+	       Format specific options:
+
+	       v_fov
+		   Set perspective parameter.
+
+	   tetrahedron
+	       Tetrahedron projection.
+
+	   tsp Truncated square pyramid projection.
+
+	   he
+	   hequirect
+	       Half equirectangular projection.
+
+	   equisolid
+	       Equisolid format.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   og  Orthographic format.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   octahedron
+	       Octahedron projection.
+
+	   cylindricalea
+	       Cylindrical Equal Area projection.
+
+       interp
+	   Set interpolation method.Note: more complex interpolation methods
+	   require much more memory to run.
+
+	   Available methods:
+
+	   near
+	   nearest
+	       Nearest neighbour.
+
+	   line
+	   linear
+	       Bilinear interpolation.
+
+	   lagrange9
+	       Lagrange9 interpolation.
+
+	   cube
+	   cubic
+	       Bicubic interpolation.
+
+	   lanc
+	   lanczos
+	       Lanczos interpolation.
+
+	   sp16
+	   spline16
+	       Spline16 interpolation.
+
+	   gauss
+	   gaussian
+	       Gaussian interpolation.
+
+	   mitchell
+	       Mitchell interpolation.
+
+	   Default value is @samp{line}.
+
+       w
+       h   Set the output video resolution.
+
+	   Default resolution depends on formats.
+
+       in_stereo
+       out_stereo
+	   Set the input/output stereo format.
+
+	   2d  2D mono
+
+	   sbs Side by side
+
+	   tb  Top bottom
+
+	   Default value is @samp{2d} for input and output format.
+
+       yaw
+       pitch
+       roll
+	   Set rotation for the output video. Values in degrees.
+
+       rorder
+	   Set rotation order for the output video. Choose one item for each
+	   position.
+
+	   y, Y
+	       yaw
+
+	   p, P
+	       pitch
+
+	   r, R
+	       roll
+
+	   Default value is @samp{ypr}.
+
+       h_flip
+       v_flip
+       d_flip
+	   Flip the output video horizontally(swaps
+	   left-right)/vertically(swaps up-down)/in-depth(swaps back-forward).
+	   Boolean values.
+
+       ih_flip
+       iv_flip
+	   Set if input video is flipped horizontally/vertically. Boolean
+	   values.
+
+       in_trans
+	   Set if input video is transposed. Boolean value, by default
+	   disabled.
+
+       out_trans
+	   Set if output video needs to be transposed. Boolean value, by
+	   default disabled.
+
+       h_offset
+       v_offset
+	   Set output horizontal/vertical off-axis offset. Default is set to
+	   0.  Allowed range is from -1 to 1.
+
+       alpha_mask
+	   Build mask in alpha plane for all unmapped pixels by marking them
+	   fully transparent. Boolean value, by default disabled.
+
+       reset_rot
+	   Reset rotation of output video. Boolean value, by default disabled.
+
+       Examples
+
+       o   Convert equirectangular video to cubemap with 3x2 layout and 1%
+	   padding using bicubic interpolation:
+
+		   ffmpeg -i input.mkv -vf v360=e:c3x2:cubic:out_pad=0.01 output.mkv
+
+       o   Extract back view of Equi-Angular Cubemap:
+
+		   ffmpeg -i input.mkv -vf v360=eac:flat:yaw=180 output.mkv
+
+       o   Convert transposed and horizontally flipped Equi-Angular Cubemap in
+	   side-by-side stereo format to equirectangular top-bottom stereo
+	   format:
+
+		   v360=eac:equirect:in_stereo=sbs:in_trans=1:ih_flip=1:out_stereo=tb
+
+       Commands
+
+       This filter supports subset of above options as commands.
+
+   vaguedenoiser
+       Apply a wavelet based denoiser.
+
+       It transforms each frame from the video input into the wavelet domain,
+       using Cohen-Daubechies-Feauveau 9/7. Then it applies some filtering to
+       the obtained coefficients. It does an inverse wavelet transform after.
+       Due to wavelet properties, it should give a nice smoothed result, and
+       reduced noise, without blurring picture features.
+
+       This filter accepts the following options:
+
+       threshold
+	   The filtering strength. The higher, the more filtered the video
+	   will be.  Hard thresholding can use a higher threshold than soft
+	   thresholding before the video looks overfiltered. Default value is
+	   2.
+
+       method
+	   The filtering method the filter will use.
+
+	   It accepts the following values:
+
+	   hard
+	       All values under the threshold will be zeroed.
+
+	   soft
+	       All values under the threshold will be zeroed. All values above
+	       will be reduced by the threshold.
+
+	   garrote
+	       Scales or nullifies coefficients - intermediary between (more)
+	       soft and (less) hard thresholding.
+
+	   Default is garrote.
+
+       nsteps
+	   Number of times, the wavelet will decompose the picture. Picture
+	   can't be decomposed beyond a particular point (typically, 8 for a
+	   640x480 frame - as 2^9 = 512 > 480). Valid values are integers
+	   between 1 and 32. Default value is 6.
+
+       percent
+	   Partial of full denoising (limited coefficients shrinking), from 0
+	   to 100. Default value is 85.
+
+       planes
+	   A list of the planes to process. By default all planes are
+	   processed.
+
+       type
+	   The threshold type the filter will use.
+
+	   It accepts the following values:
+
+	   universal
+	       Threshold used is same for all decompositions.
+
+	   bayes
+	       Threshold used depends also on each decomposition coefficients.
+
+	   Default is universal.
+
+   varblur
+       Apply variable blur filter by using 2nd video stream to set blur
+       radius.	The 2nd stream must have the same dimensions.
+
+       This filter accepts the following options:
+
+       min_r
+	   Set min allowed radius. Allowed range is from 0 to 254. Default is
+	   0.
+
+       max_r
+	   Set max allowed radius. Allowed range is from 1 to 255. Default is
+	   8.
+
+       planes
+	   Set which planes to process. By default, all are used.
+
+       The "varblur" filter also supports the framesync options.
+
+       Commands
+
+       This filter supports all the above options as commands.
+
+   vectorscope
+       Display 2 color component values in the two dimensional graph (which is
+       called a vectorscope).
+
+       This filter accepts the following options:
+
+       mode, m
+	   Set vectorscope mode.
+
+	   It accepts the following values:
+
+	   gray
+	   tint
+	       Gray values are displayed on graph, higher brightness means
+	       more pixels have same component color value on location in
+	       graph. This is the default mode.
+
+	   color
+	       Gray values are displayed on graph. Surrounding pixels values
+	       which are not present in video frame are drawn in gradient of 2
+	       color components which are set by option "x" and "y". The 3rd
+	       color component is static.
+
+	   color2
+	       Actual color components values present in video frame are
+	       displayed on graph.
+
+	   color3
+	       Similar as color2 but higher frequency of same values "x" and
+	       "y" on graph increases value of another color component, which
+	       is luminance by default values of "x" and "y".
+
+	   color4
+	       Actual colors present in video frame are displayed on graph. If
+	       two different colors map to same position on graph then color
+	       with higher value of component not present in graph is picked.
+
+	   color5
+	       Gray values are displayed on graph. Similar to "color" but with
+	       3rd color component picked from radial gradient.
+
+       x   Set which color component will be represented on X-axis. Default is
+	   1.
+
+       y   Set which color component will be represented on Y-axis. Default is
+	   2.
+
+       intensity, i
+	   Set intensity, used by modes: gray, color, color3 and color5 for
+	   increasing brightness of color component which represents frequency
+	   of (X, Y) location in graph.
+
+       envelope, e
+	   none
+	       No envelope, this is default.
+
+	   instant
+	       Instant envelope, even darkest single pixel will be clearly
+	       highlighted.
+
+	   peak
+	       Hold maximum and minimum values presented in graph over time.
+	       This way you can still spot out of range values without
+	       constantly looking at vectorscope.
+
+	   peak+instant
+	       Peak and instant envelope combined together.
+
+       graticule, g
+	   Set what kind of graticule to draw.
+
+	   none
+	   green
+	   color
+	   invert
+       opacity, o
+	   Set graticule opacity.
+
+       flags, f
+	   Set graticule flags.
+
+	   white
+	       Draw graticule for white point.
+
+	   black
+	       Draw graticule for black point.
+
+	   name
+	       Draw color points short names.
+
+       bgopacity, b
+	   Set background opacity.
+
+       lthreshold, l
+	   Set low threshold for color component not represented on X or Y
+	   axis.  Values lower than this value will be ignored. Default is 0.
+	   Note this value is multiplied with actual max possible value one
+	   pixel component can have. So for 8-bit input and low threshold
+	   value of 0.1 actual threshold is 0.1 * 255 = 25.
+
+       hthreshold, h
+	   Set high threshold for color component not represented on X or Y
+	   axis.  Values higher than this value will be ignored. Default is 1.
+	   Note this value is multiplied with actual max possible value one
+	   pixel component can have. So for 8-bit input and high threshold
+	   value of 0.9 actual threshold is 0.9 * 255 = 230.
+
+       colorspace, c
+	   Set what kind of colorspace to use when drawing graticule.
+
+	   auto
+	   601
+	   709
+
+	   Default is auto.
+
+       tint0, t0
+       tint1, t1
+	   Set color tint for gray/tint vectorscope mode. By default both
+	   options are zero.  This means no tint, and output will remain gray.
+
+   vidstabdetect
+       Analyze video stabilization/deshaking. Perform pass 1 of 2, see
+       vidstabtransform for pass 2.
+
+       This filter generates a file with relative translation and rotation
+       transform information about subsequent frames, which is then used by
+       the vidstabtransform filter.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libvidstab".
+
+       This filter accepts the following options:
+
+       result
+	   Set the path to the file used to write the transforms information.
+	   Default value is transforms.trf.
+
+       shakiness
+	   Set how shaky the video is and how quick the camera is. It accepts
+	   an integer in the range 1-10, a value of 1 means little shakiness,
+	   a value of 10 means strong shakiness. Default value is 5.
+
+       accuracy
+	   Set the accuracy of the detection process. It must be a value in
+	   the range 1-15. A value of 1 means low accuracy, a value of 15
+	   means high accuracy. Default value is 15.
+
+       stepsize
+	   Set stepsize of the search process. The region around minimum is
+	   scanned with 1 pixel resolution. Default value is 6.
+
+       mincontrast
+	   Set minimum contrast. Below this value a local measurement field is
+	   discarded. Must be a floating point value in the range 0-1. Default
+	   value is 0.3.
+
+       tripod
+	   Set reference frame number for tripod mode.
+
+	   If enabled, the motion of the frames is compared to a reference
+	   frame in the filtered stream, identified by the specified number.
+	   The idea is to compensate all movements in a more-or-less static
+	   scene and keep the camera view absolutely still.
+
+	   If set to 0, it is disabled. The frames are counted starting from
+	   1.
+
+       show
+	   Show fields and transforms in the resulting frames. It accepts an
+	   integer in the range 0-2. Default value is 0, which disables any
+	   visualization.
+
+       fileformat
+	   Format for the transforms data file to be written.  Acceptable
+	   values are
+
+	   ascii
+	       Human-readable plain text
+
+	   binary
+	       Binary format, roughly 40% smaller than "ascii". (default)
+
+       Examples
+
+       o   Use default values:
+
+		   vidstabdetect
+
+       o   Analyze strongly shaky movie and put the results in file
+	   mytransforms.trf:
+
+		   vidstabdetect=shakiness=10:accuracy=15:result="mytransforms.trf"
+
+       o   Visualize the result of internal transformations in the resulting
+	   video:
+
+		   vidstabdetect=show=1
+
+       o   Analyze a video with medium shakiness using ffmpeg:
+
+		   ffmpeg -i input -vf vidstabdetect=shakiness=5:show=1 dummy.avi
+
+   vidstabtransform
+       Video stabilization/deshaking: pass 2 of 2, see vidstabdetect for pass
+       1.
+
+       Read a file with transform information for each frame and
+       apply/compensate them. Together with the vidstabdetect filter this can
+       be used to deshake videos. See also
+       <http://public.hronopik.de/vid.stab>. It is important to also use the
+       unsharp filter, see below.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libvidstab".
+
+       Options
+
+       input
+	   Set path to the file used to read the transforms. Default value is
+	   transforms.trf.
+
+       smoothing
+	   Set the number of frames (value*2 + 1) used for lowpass filtering
+	   the camera movements. Default value is 10.
+
+	   For example a number of 10 means that 21 frames are used (10 in the
+	   past and 10 in the future) to smoothen the motion in the video. A
+	   larger value leads to a smoother video, but limits the acceleration
+	   of the camera (pan/tilt movements). 0 is a special case where a
+	   static camera is simulated.
+
+       optalgo
+	   Set the camera path optimization algorithm.
+
+	   Accepted values are:
+
+	   gauss
+	       gaussian kernel low-pass filter on camera motion (default)
+
+	   avg averaging on transformations
+
+       maxshift
+	   Set maximal number of pixels to translate frames. Default value is
+	   -1, meaning no limit.
+
+       maxangle
+	   Set maximal angle in radians (degree*PI/180) to rotate frames.
+	   Default value is -1, meaning no limit.
+
+       crop
+	   Specify how to deal with borders that may be visible due to
+	   movement compensation.
+
+	   Available values are:
+
+	   keep
+	       keep image information from previous frame (default)
+
+	   black
+	       fill the border black
+
+       invert
+	   Invert transforms if set to 1. Default value is 0.
+
+       relative
+	   Consider transforms as relative to previous frame if set to 1,
+	   absolute if set to 0. Default value is 0.
+
+       zoom
+	   Set percentage to zoom. A positive value will result in a zoom-in
+	   effect, a negative value in a zoom-out effect. Default value is 0
+	   (no zoom).
+
+       optzoom
+	   Set optimal zooming to avoid borders.
+
+	   Accepted values are:
+
+	   0   disabled
+
+	   1   optimal static zoom value is determined (only very strong
+	       movements will lead to visible borders) (default)
+
+	   2   optimal adaptive zoom value is determined (no borders will be
+	       visible), see zoomspeed
+
+	   Note that the value given at zoom is added to the one calculated
+	   here.
+
+       zoomspeed
+	   Set percent to zoom maximally each frame (enabled when optzoom is
+	   set to 2). Range is from 0 to 5, default value is 0.25.
+
+       interpol
+	   Specify type of interpolation.
+
+	   Available values are:
+
+	   no  no interpolation
+
+	   linear
+	       linear only horizontal
+
+	   bilinear
+	       linear in both directions (default)
+
+	   bicubic
+	       cubic in both directions (slow)
+
+       tripod
+	   Enable virtual tripod mode if set to 1, which is equivalent to
+	   "relative=0:smoothing=0". Default value is 0.
+
+	   Use also "tripod" option of vidstabdetect.
+
+       debug
+	   Increase log verbosity if set to 1. Also the detected global
+	   motions are written to the temporary file global_motions.trf.
+	   Default value is 0.
+
+       Examples
+
+       o   Use ffmpeg for a typical stabilization with default values:
+
+		   ffmpeg -i inp.mpeg -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 inp_stabilized.mpeg
+
+	   Note the use of the unsharp filter which is always recommended.
+
+       o   Zoom in a bit more and load transform data from a given file:
+
+		   vidstabtransform=zoom=5:input="mytransforms.trf"
+
+       o   Smoothen the video even more:
+
+		   vidstabtransform=smoothing=30
+
+   vflip
+       Flip the input video vertically.
+
+       For example, to vertically flip a video with ffmpeg:
+
+	       ffmpeg -i in.avi -vf "vflip" out.avi
+
+   vfrdet
+       Detect variable frame rate video.
+
+       This filter tries to detect if the input is variable or constant frame
+       rate.
+
+       At end it will output number of frames detected as having variable
+       delta pts, and ones with constant delta pts.  If there was frames with
+       variable delta, than it will also show min, max and average delta
+       encountered.
+
+   vibrance
+       Boost or alter saturation.
+
+       The filter accepts the following options:
+
+       intensity
+	   Set strength of boost if positive value or strength of alter if
+	   negative value.  Default is 0. Allowed range is from -2 to 2.
+
+       rbal
+	   Set the red balance. Default is 1. Allowed range is from -10 to 10.
+
+       gbal
+	   Set the green balance. Default is 1. Allowed range is from -10 to
+	   10.
+
+       bbal
+	   Set the blue balance. Default is 1. Allowed range is from -10 to
+	   10.
+
+       rlum
+	   Set the red luma coefficient.
+
+       glum
+	   Set the green luma coefficient.
+
+       blum
+	   Set the blue luma coefficient.
+
+       alternate
+	   If "intensity" is negative and this is set to 1, colors will
+	   change, otherwise colors will be less saturated, more towards gray.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   vif
+       Obtain the average VIF (Visual Information Fidelity) between two input
+       videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained average VIF score is printed through the logging system.
+
+       The filter stores the calculated VIF score of each frame.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi vif -f null -
+
+   vignette
+       Make or reverse a natural vignetting effect.
+
+       The filter accepts the following options:
+
+       angle, a
+	   Set lens angle expression as a number of radians.
+
+	   The value is clipped in the "[0,PI/2]" range.
+
+	   Default value: "PI/5"
+
+       x0
+       y0  Set center coordinates expressions. Respectively "w/2" and "h/2" by
+	   default.
+
+       mode
+	   Set forward/backward mode.
+
+	   Available modes are:
+
+	   forward
+	       The larger the distance from the central point, the darker the
+	       image becomes.
+
+	   backward
+	       The larger the distance from the central point, the brighter
+	       the image becomes.  This can be used to reverse a vignette
+	       effect, though there is no automatic detection to extract the
+	       lens angle and other settings (yet). It can also be used to
+	       create a burning effect.
+
+	   Default value is forward.
+
+       eval
+	   Set evaluation mode for the expressions (angle, x0, y0).
+
+	   It accepts the following values:
+
+	   init
+	       Evaluate expressions only once during the filter
+	       initialization.
+
+	   frame
+	       Evaluate expressions for each incoming frame. This is way
+	       slower than the init mode since it requires all the scalers to
+	       be re-computed, but it allows advanced dynamic expressions.
+
+	   Default value is init.
+
+       dither
+	   Set dithering to reduce the circular banding effects. Default is 1
+	   (enabled).
+
+       aspect
+	   Set vignette aspect. This setting allows one to adjust the shape of
+	   the vignette.  Setting this value to the SAR of the input will make
+	   a rectangular vignetting following the dimensions of the video.
+
+	   Default is "1/1".
+
+       Expressions
+
+       The alpha, x0 and y0 expressions can contain the following parameters.
+
+       w
+       h   input width and height
+
+       n   the number of input frame, starting from 0
+
+       pts the PTS (Presentation TimeStamp) time of the filtered video frame,
+	   expressed in TB units, NAN if undefined
+
+       r   frame rate of the input video, NAN if the input frame rate is
+	   unknown
+
+       t   the PTS (Presentation TimeStamp) of the filtered video frame,
+	   expressed in seconds, NAN if undefined
+
+       tb  time base of the input video
+
+       Examples
+
+       o   Apply simple strong vignetting effect:
+
+		   vignette=PI/4
+
+       o   Make a flickering vignetting:
+
+		   vignette='PI/4+random(1)*PI/50':eval=frame
+
+   vmafmotion
+       Obtain the average VMAF motion score of a video.  It is one of the
+       component metrics of VMAF.
+
+       The obtained average motion score is printed through the logging
+       system.
+
+       The filter accepts the following options:
+
+       stats_file
+	   If specified, the filter will use the named file to save the motion
+	   score of each frame with respect to the previous frame.  When
+	   filename equals "-" the data is sent to standard output.
+
+       Example:
+
+	       ffmpeg -i ref.mpg -vf vmafmotion -f null -
+
+   vstack
+       Stack input videos vertically.
+
+       All streams must be of same pixel format and of same width.
+
+       Note that this filter is faster than using overlay and pad filter to
+       create same output.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of input streams. Default is 2.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+   w3fdif
+       Deinterlace the input video ("w3fdif" stands for "Weston 3 Field
+       Deinterlacing Filter").
+
+       Based on the process described by Martin Weston for BBC R&D, and
+       implemented based on the de-interlace algorithm written by Jim
+       Easterbrook for BBC R&D, the Weston 3 field deinterlacing filter uses
+       filter coefficients calculated by BBC R&D.
+
+       This filter uses field-dominance information in frame to decide which
+       of each pair of fields to place first in the output.  If it gets it
+       wrong use setfield filter before "w3fdif" filter.
+
+       There are two sets of filter coefficients, so called "simple" and
+       "complex". Which set of filter coefficients is used can be set by
+       passing an optional parameter:
+
+       filter
+	   Set the interlacing filter coefficients. Accepts one of the
+	   following values:
+
+	   simple
+	       Simple filter coefficient set.
+
+	   complex
+	       More-complex filter coefficient set.
+
+	   Default value is complex.
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   frame
+	       Output one frame for each frame.
+
+	   field
+	       Output one frame for each field.
+
+	   The default value is "field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   tff Assume the top field is first.
+
+	   bff Assume the bottom field is first.
+
+	   auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   all Deinterlace all frames,
+
+	   interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   Default value is all.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   waveform
+       Video waveform monitor.
+
+       The waveform monitor plots color component intensity. By default luma
+       only. Each column of the waveform corresponds to a column of pixels in
+       the source video.
+
+       It accepts the following options:
+
+       mode, m
+	   Can be either "row", or "column". Default is "column".  In row
+	   mode, the graph on the left side represents color component value 0
+	   and the right side represents value = 255. In column mode, the top
+	   side represents color component value = 0 and bottom side
+	   represents value = 255.
+
+       intensity, i
+	   Set intensity. Smaller values are useful to find out how many
+	   values of the same luminance are distributed across input
+	   rows/columns.  Default value is 0.04. Allowed range is [0, 1].
+
+       mirror, r
+	   Set mirroring mode. 0 means unmirrored, 1 means mirrored.  In
+	   mirrored mode, higher values will be represented on the left side
+	   for "row" mode and at the top for "column" mode. Default is 1
+	   (mirrored).
+
+       display, d
+	   Set display mode.  It accepts the following values:
+
+	   overlay
+	       Presents information identical to that in the "parade", except
+	       that the graphs representing color components are superimposed
+	       directly over one another.
+
+	       This display mode makes it easier to spot relative differences
+	       or similarities in overlapping areas of the color components
+	       that are supposed to be identical, such as neutral whites,
+	       grays, or blacks.
+
+	   stack
+	       Display separate graph for the color components side by side in
+	       "row" mode or one below the other in "column" mode.
+
+	   parade
+	       Display separate graph for the color components side by side in
+	       "column" mode or one below the other in "row" mode.
+
+	       Using this display mode makes it easy to spot color casts in
+	       the highlights and shadows of an image, by comparing the
+	       contours of the top and the bottom graphs of each waveform.
+	       Since whites, grays, and blacks are characterized by exactly
+	       equal amounts of red, green, and blue, neutral areas of the
+	       picture should display three waveforms of roughly equal
+	       width/height. If not, the correction is easy to perform by
+	       making level adjustments the three waveforms.
+
+	   Default is "stack".
+
+       components, c
+	   Set which color components to display. Default is 1, which means
+	   only luma or red color component if input is in RGB colorspace. If
+	   is set for example to 7 it will display all 3 (if) available color
+	   components.
+
+       envelope, e
+	   none
+	       No envelope, this is default.
+
+	   instant
+	       Instant envelope, minimum and maximum values presented in graph
+	       will be easily visible even with small "step" value.
+
+	   peak
+	       Hold minimum and maximum values presented in graph across time.
+	       This way you can still spot out of range values without
+	       constantly looking at waveforms.
+
+	   peak+instant
+	       Peak and instant envelope combined together.
+
+       filter, f
+	   lowpass
+	       No filtering, this is default.
+
+	   flat
+	       Luma and chroma combined together.
+
+	   aflat
+	       Similar as above, but shows difference between blue and red
+	       chroma.
+
+	   xflat
+	       Similar as above, but use different colors.
+
+	   yflat
+	       Similar as above, but again with different colors.
+
+	   chroma
+	       Displays only chroma.
+
+	   color
+	       Displays actual color value on waveform.
+
+	   acolor
+	       Similar as above, but with luma showing frequency of chroma
+	       values.
+
+       graticule, g
+	   Set which graticule to display.
+
+	   none
+	       Do not display graticule.
+
+	   green
+	       Display green graticule showing legal broadcast ranges.
+
+	   orange
+	       Display orange graticule showing legal broadcast ranges.
+
+	   invert
+	       Display invert graticule showing legal broadcast ranges.
+
+       opacity, o
+	   Set graticule opacity.
+
+       flags, fl
+	   Set graticule flags.
+
+	   numbers
+	       Draw numbers above lines. By default enabled.
+
+	   dots
+	       Draw dots instead of lines.
+
+       scale, s
+	   Set scale used for displaying graticule.
+
+	   digital
+	   millivolts
+	   ire
+
+	   Default is digital.
+
+       bgopacity, b
+	   Set background opacity.
+
+       tint0, t0
+       tint1, t1
+	   Set tint for output.  Only used with lowpass filter and when
+	   display is not overlay and input pixel formats are not RGB.
+
+       fitmode, fm
+	   Set sample aspect ratio of video output frames.  Can be used to
+	   configure waveform so it is not streched too much in one of
+	   directions.
+
+	   none
+	       Set sample aspect ration to 1/1.
+
+	   size
+	       Set sample aspect ratio to match input size of video
+
+	   Default is none.
+
+       input
+	   Set input formats for filter to pick from.  Can be all, for
+	   selecting from all available formats, or first, for selecting first
+	   available format.  Default is first.
+
+   weave, doubleweave
+       The "weave" takes a field-based video input and join each two
+       sequential fields into single frame, producing a new double height clip
+       with half the frame rate and half the frame count.
+
+       The "doubleweave" works same as "weave" but without halving frame rate
+       and frame count.
+
+       It accepts the following option:
+
+       first_field
+	   Set first field. Available values are:
+
+	   top, t
+	       Set the frame as top-field-first.
+
+	   bottom, b
+	       Set the frame as bottom-field-first.
+
+       Examples
+
+       o   Interlace video using select and separatefields filter:
+
+		   separatefields,select=eq(mod(n,4),0)+eq(mod(n,4),3),weave
+
+   xbr
+       Apply the xBR high-quality magnification filter which is designed for
+       pixel art. It follows a set of edge-detection rules, see
+       <https://forums.libretro.com/t/xbr-algorithm-tutorial/123>.
+
+       It accepts the following option:
+
+       n   Set the scaling dimension: 2 for "2xBR", 3 for "3xBR" and 4 for
+	   "4xBR".  Default is 3.
+
+   xcorrelate
+       Apply normalized cross-correlation between first and second input video
+       stream.
+
+       Second input video stream dimensions must be lower than first input
+       video stream.
+
+       The filter accepts the following options:
+
+       planes
+	   Set which planes to process.
+
+       secondary
+	   Set which secondary video frames will be processed from second
+	   input video stream, can be first or all. Default is all.
+
+       The "xcorrelate" filter also supports the framesync options.
+
+   xfade
+       Apply cross fade from one input video stream to another input video
+       stream.	The cross fade is applied for specified duration.
+
+       Both inputs must be constant frame-rate and have the same resolution,
+       pixel format, frame rate and timebase.
+
+       The filter accepts the following options:
+
+       transition
+	   Set one of available transition effects:
+
+	   custom
+	   fade
+	   wipeleft
+	   wiperight
+	   wipeup
+	   wipedown
+	   slideleft
+	   slideright
+	   slideup
+	   slidedown
+	   circlecrop
+	   rectcrop
+	   distance
+	   fadeblack
+	   fadewhite
+	   radial
+	   smoothleft
+	   smoothright
+	   smoothup
+	   smoothdown
+	   circleopen
+	   circleclose
+	   vertopen
+	   vertclose
+	   horzopen
+	   horzclose
+	   dissolve
+	   pixelize
+	   diagtl
+	   diagtr
+	   diagbl
+	   diagbr
+	   hlslice
+	   hrslice
+	   vuslice
+	   vdslice
+	   hblur
+	   fadegrays
+	   wipetl
+	   wipetr
+	   wipebl
+	   wipebr
+	   squeezeh
+	   squeezev
+	   zoomin
+	   fadefast
+	   fadeslow
+	   hlwind
+	   hrwind
+	   vuwind
+	   vdwind
+	   coverleft
+	   coverright
+	   coverup
+	   coverdown
+	   revealleft
+	   revealright
+	   revealup
+	   revealdown
+
+	   Default transition effect is fade.
+
+       duration
+	   Set cross fade duration in seconds.	Range is 0 to 60 seconds.
+	   Default duration is 1 second.
+
+       offset
+	   Set cross fade start relative to first input stream in seconds.
+	   Default offset is 0.
+
+       expr
+	   Set expression for custom transition effect.
+
+	   The expressions can use the following variables and functions:
+
+	   X
+	   Y   The coordinates of the current sample.
+
+	   W
+	   H   The width and height of the image.
+
+	   P   Progress of transition effect.
+
+	   PLANE
+	       Currently processed plane.
+
+	   A   Return value of first input at current location and plane.
+
+	   B   Return value of second input at current location and plane.
+
+	   a0(x, y)
+	   a1(x, y)
+	   a2(x, y)
+	   a3(x, y)
+	       Return the value of the pixel at location (x,y) of the
+	       first/second/third/fourth component of first input.
+
+	   b0(x, y)
+	   b1(x, y)
+	   b2(x, y)
+	   b3(x, y)
+	       Return the value of the pixel at location (x,y) of the
+	       first/second/third/fourth component of second input.
+
+       Examples
+
+       o   Cross fade from one input video to another input video, with fade
+	   transition and duration of transition of 2 seconds starting at
+	   offset of 5 seconds:
+
+		   ffmpeg -i first.mp4 -i second.mp4 -filter_complex xfade=transition=fade:duration=2:offset=5 output.mp4
+
+   xmedian
+       Pick median pixels from several input videos.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of inputs.  Default is 3. Allowed range is from 3 to
+	   255.  If number of inputs is even number, than result will be mean
+	   value between two median values.
+
+       planes
+	   Set which planes to filter. Default value is 15, by which all
+	   planes are processed.
+
+       percentile
+	   Set median percentile. Default value is 0.5.  Default value of 0.5
+	   will pick always median values, while 0 will pick minimum values,
+	   and 1 maximum values.
+
+       Commands
+
+       This filter supports all above options as commands, excluding option
+       "inputs".
+
+   xstack
+       Stack video inputs into custom layout.
+
+       All streams must be of same pixel format.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of input streams. Default is 2.
+
+       layout
+	   Specify layout of inputs.  This option requires the desired layout
+	   configuration to be explicitly set by the user.  This sets position
+	   of each video input in output. Each input is separated by '|'.  The
+	   first number represents the column, and the second number
+	   represents the row.	Numbers start at 0 and are separated by '_'.
+	   Optionally one can use wX and hX, where X is video input from which
+	   to take width or height.  Multiple values can be used when
+	   separated by '+'. In such case values are summed together.
+
+	   Note that if inputs are of different sizes gaps may appear, as not
+	   all of the output video frame will be filled. Similarly, videos can
+	   overlap each other if their position doesn't leave enough space for
+	   the full frame of adjoining videos.
+
+	   For 2 inputs, a default layout of "0_0|w0_0" (equivalent to
+	   "grid=2x1") is set. In all other cases, a layout or a grid must be
+	   set by the user. Either "grid" or "layout" can be specified at a
+	   time.  Specifying both will result in an error.
+
+       grid
+	   Specify a fixed size grid of inputs.  This option is used to create
+	   a fixed size grid of the input streams. Set the grid size in the
+	   form "COLUMNSxROWS". There must be "ROWS * COLUMNS" input streams
+	   and they will be arranged as a grid with "ROWS" rows and "COLUMNS"
+	   columns. When using this option, each input stream within a row
+	   must have the same height and all the rows must have the same
+	   width.
+
+	   If "grid" is set, then "inputs" option is ignored and is implicitly
+	   set to "ROWS * COLUMNS".
+
+	   For 2 inputs, a default grid of "2x1" (equivalent to
+	   "layout=0_0|w0_0") is set. In all other cases, a layout or a grid
+	   must be set by the user. Either "grid" or "layout" can be specified
+	   at a time.  Specifying both will result in an error.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+       fill
+	   If set to valid color, all unused pixels will be filled with that
+	   color.  By default fill is set to none, so it is disabled.
+
+       Examples
+
+       o   Display 4 inputs into 2x2 grid.
+
+	   Layout:
+
+		   input1(0, 0)  | input3(w0, 0)
+		   input2(0, h0) | input4(w0, h0)
+
+		   xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0
+
+	   Note that if inputs are of different sizes, gaps or overlaps may
+	   occur.
+
+       o   Display 4 inputs into 1x4 grid.
+
+	   Layout:
+
+		   input1(0, 0)
+		   input2(0, h0)
+		   input3(0, h0+h1)
+		   input4(0, h0+h1+h2)
+
+		   xstack=inputs=4:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2
+
+	   Note that if inputs are of different widths, unused space will
+	   appear.
+
+       o   Display 9 inputs into 3x3 grid.
+
+	   Layout:
+
+		   input1(0, 0)       | input4(w0, 0)	   | input7(w0+w3, 0)
+		   input2(0, h0)      | input5(w0, h0)	   | input8(w0+w3, h0)
+		   input3(0, h0+h1)   | input6(w0, h0+h1)  | input9(w0+w3, h0+h1)
+
+		   xstack=inputs=9:layout=0_0|0_h0|0_h0+h1|w0_0|w0_h0|w0_h0+h1|w0+w3_0|w0+w3_h0|w0+w3_h0+h1
+
+	   Note that if inputs are of different sizes, gaps or overlaps may
+	   occur.
+
+       o   Display 16 inputs into 4x4 grid.
+
+	   Layout:
+
+		   input1(0, 0)       | input5(w0, 0)	    | input9 (w0+w4, 0)       | input13(w0+w4+w8, 0)
+		   input2(0, h0)      | input6(w0, h0)	    | input10(w0+w4, h0)      | input14(w0+w4+w8, h0)
+		   input3(0, h0+h1)   | input7(w0, h0+h1)   | input11(w0+w4, h0+h1)   | input15(w0+w4+w8, h0+h1)
+		   input4(0, h0+h1+h2)| input8(w0, h0+h1+h2)| input12(w0+w4, h0+h1+h2)| input16(w0+w4+w8, h0+h1+h2)
+
+		   xstack=inputs=16:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2|w0_0|w0_h0|w0_h0+h1|w0_h0+h1+h2|w0+w4_0|
+		   w0+w4_h0|w0+w4_h0+h1|w0+w4_h0+h1+h2|w0+w4+w8_0|w0+w4+w8_h0|w0+w4+w8_h0+h1|w0+w4+w8_h0+h1+h2
+
+	   Note that if inputs are of different sizes, gaps or overlaps may
+	   occur.
+
+   yadif
+       Deinterlace the input video ("yadif" means "yet another deinterlacing
+       filter").
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   2, send_frame_nospatial
+	       Like "send_frame", but it skips the spatial interlacing check.
+
+	   3, send_field_nospatial
+	       Like "send_field", but it skips the spatial interlacing check.
+
+	   The default value is "send_frame".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   yadif_cuda
+       Deinterlace the input video using the yadif algorithm, but implemented
+       in CUDA so that it can work as part of a GPU accelerated pipeline with
+       nvdec and/or nvenc.
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   2, send_frame_nospatial
+	       Like "send_frame", but it skips the spatial interlacing check.
+
+	   3, send_field_nospatial
+	       Like "send_field", but it skips the spatial interlacing check.
+
+	   The default value is "send_frame".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   yaepblur
+       Apply blur filter while preserving edges ("yaepblur" means "yet another
+       edge preserving blur filter").  The algorithm is described in "J. S.
+       Lee, Digital image enhancement and noise filtering by use of local
+       statistics, IEEE Trans. Pattern Anal. Mach. Intell. PAMI-2, 1980."
+
+       It accepts the following parameters:
+
+       radius, r
+	   Set the window radius. Default value is 3.
+
+       planes, p
+	   Set which planes to filter. Default is only the first plane.
+
+       sigma, s
+	   Set blur strength. Default value is 128.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   zoompan
+       Apply Zoom & Pan effect.
+
+       This filter accepts the following options:
+
+       zoom, z
+	   Set the zoom expression. Range is 1-10. Default is 1.
+
+       x
+       y   Set the x and y expression. Default is 0.
+
+       d   Set the duration expression in number of frames.  This sets for how
+	   many number of frames effect will last for single input image.
+	   Default is 90.
+
+       s   Set the output image size, default is 'hd720'.
+
+       fps Set the output frame rate, default is '25'.
+
+       Each expression can contain the following constants:
+
+       in_w, iw
+	   Input width.
+
+       in_h, ih
+	   Input height.
+
+       out_w, ow
+	   Output width.
+
+       out_h, oh
+	   Output height.
+
+       in  Input frame count.
+
+       on  Output frame count.
+
+       in_time, it
+	   The input timestamp expressed in seconds. It's NAN if the input
+	   timestamp is unknown.
+
+       out_time, time, ot
+	   The output timestamp expressed in seconds.
+
+       x
+       y   Last calculated 'x' and 'y' position from 'x' and 'y' expression
+	   for current input frame.
+
+       px
+       py  'x' and 'y' of last output frame of previous input frame or 0 when
+	   there was not yet such frame (first input frame).
+
+       zoom
+	   Last calculated zoom from 'z' expression for current input frame.
+
+       pzoom
+	   Last calculated zoom of last output frame of previous input frame.
+
+       duration
+	   Number of output frames for current input frame. Calculated from
+	   'd' expression for each input frame.
+
+       pduration
+	   number of output frames created for previous input frame
+
+       a   Rational number: input width / input height
+
+       sar sample aspect ratio
+
+       dar display aspect ratio
+
+       Examples
+
+       o   Zoom in up to 1.5x and pan at same time to some spot near center of
+	   picture:
+
+		   zoompan=z='min(zoom+0.0015,1.5)':d=700:x='if(gte(zoom,1.5),x,x+1/a)':y='if(gte(zoom,1.5),y,y+1)':s=640x360
+
+       o   Zoom in up to 1.5x and pan always at center of picture:
+
+		   zoompan=z='min(zoom+0.0015,1.5)':d=700:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
+
+       o   Same as above but without pausing:
+
+		   zoompan=z='min(max(zoom,pzoom)+0.0015,1.5)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
+
+       o   Zoom in 2x into center of picture only for the first second of the
+	   input video:
+
+		   zoompan=z='if(between(in_time,0,1),2,1)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
+
+   zscale
+       Scale (resize) the input video, using the z.lib library:
+       <https://github.com/sekrit-twc/zimg>. To enable compilation of this
+       filter, you need to configure FFmpeg with "--enable-libzimg".
+
+       The zscale filter forces the output display aspect ratio to be the same
+       as the input, by changing the output sample aspect ratio.
+
+       If the input image format is different from the format requested by the
+       next filter, the zscale filter will convert the input to the requested
+       format.
+
+       Options
+
+       The filter accepts the following options.
+
+       width, w
+       height, h
+	   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+	   If the width or w value is 0, the input width is used for the
+	   output. If the height or h value is 0, the input height is used for
+	   the output.
+
+	   If one and only one of the values is -n with n >= 1, the zscale
+	   filter will use a value that maintains the aspect ratio of the
+	   input image, calculated from the other specified dimension. After
+	   that it will, however, make sure that the calculated dimension is
+	   divisible by n and adjust the value if necessary.
+
+	   If both values are -n with n >= 1, the behavior will be identical
+	   to both values being set to 0 as previously detailed.
+
+	   See below for the list of accepted constants for use in the
+	   dimension expression.
+
+       size, s
+	   Set the video size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual.
+
+       dither, d
+	   Set the dither type.
+
+	   Possible values are:
+
+	   none
+	   ordered
+	   random
+	   error_diffusion
+
+	   Default is none.
+
+       filter, f
+	   Set the resize filter type.
+
+	   Possible values are:
+
+	   point
+	   bilinear
+	   bicubic
+	   spline16
+	   spline36
+	   lanczos
+
+	   Default is bilinear.
+
+       range, r
+	   Set the color range.
+
+	   Possible values are:
+
+	   input
+	   limited
+	   full
+
+	   Default is same as input.
+
+       primaries, p
+	   Set the color primaries.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   170m
+	   240m
+	   2020
+
+	   Default is same as input.
+
+       transfer, t
+	   Set the transfer characteristics.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   601
+	   linear
+	   2020_10
+	   2020_12
+	   smpte2084
+	   iec61966-2-1
+	   arib-std-b67
+
+	   Default is same as input.
+
+       matrix, m
+	   Set the colorspace matrix.
+
+	   Possible value are:
+
+	   input
+	   709
+	   unspecified
+	   470bg
+	   170m
+	   2020_ncl
+	   2020_cl
+
+	   Default is same as input.
+
+       rangein, rin
+	   Set the input color range.
+
+	   Possible values are:
+
+	   input
+	   limited
+	   full
+
+	   Default is same as input.
+
+       primariesin, pin
+	   Set the input color primaries.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   170m
+	   240m
+	   2020
+
+	   Default is same as input.
+
+       transferin, tin
+	   Set the input transfer characteristics.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   601
+	   linear
+	   2020_10
+	   2020_12
+
+	   Default is same as input.
+
+       matrixin, min
+	   Set the input colorspace matrix.
+
+	   Possible value are:
+
+	   input
+	   709
+	   unspecified
+	   470bg
+	   170m
+	   2020_ncl
+	   2020_cl
+       chromal, c
+	   Set the output chroma location.
+
+	   Possible values are:
+
+	   input
+	   left
+	   center
+	   topleft
+	   top
+	   bottomleft
+	   bottom
+       chromalin, cin
+	   Set the input chroma location.
+
+	   Possible values are:
+
+	   input
+	   left
+	   center
+	   topleft
+	   top
+	   bottomleft
+	   bottom
+       npl Set the nominal peak luminance.
+
+       param_a
+	   Parameter A for scaling filters. Parameter "b" for bicubic, and the
+	   number of filter taps for lanczos.
+
+       param_b
+	   Parameter B for scaling filters. Parameter "c" for bicubic.
+
+       The values of the w and h options are expressions containing the
+       following constants:
+
+       in_w
+       in_h
+	   The input width and height
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (scaled) width and height
+
+       ow
+       oh  These are the same as out_w and out_h
+
+       a   The same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar The input display aspect ratio. Calculated from "(iw / ih) * sar".
+
+       hsub
+       vsub
+	   horizontal and vertical input chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       ohsub
+       ovsub
+	   horizontal and vertical output chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       Commands
+
+       This filter supports the following commands:
+
+       width, w
+       height, h
+	   Set the output video dimension expression.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+OPENCL VIDEO FILTERS
+       Below is a description of the currently available OpenCL video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-opencl".
+
+       Running OpenCL filters requires you to initialize a hardware device and
+       to pass that device to all filters in any filter graph.
+
+       -init_hw_device opencl[=name][:device[,key=value...]]
+	   Initialise a new hardware device of type opencl called name, using
+	   the given device parameters.
+
+       -filter_hw_device name
+	   Pass the hardware device called name to all filters in any filter
+	   graph.
+
+       For more detailed information see
+       <https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options>
+
+       o   Example of choosing the first device on the second platform and
+	   running avgblur_opencl filter with default parameters on it.
+
+		   -init_hw_device opencl=gpu:1.0 -filter_hw_device gpu -i INPUT -vf "hwupload, avgblur_opencl, hwdownload" OUTPUT
+
+       Since OpenCL filters are not able to access frame data in normal
+       memory, all frame data needs to be uploaded(hwupload) to hardware
+       surfaces connected to the appropriate device before being used and then
+       downloaded(hwdownload) back to normal memory. Note that hwupload will
+       upload to a surface with the same layout as the software frame, so it
+       may be necessary to add a format filter immediately before to get the
+       input into the right format and hwdownload does not support all formats
+       on the output - it may be necessary to insert an additional format
+       filter immediately following in the graph to get the output in a
+       supported format.
+
+   avgblur_opencl
+       Apply average blur filter.
+
+       The filter accepts the following options:
+
+       sizeX
+	   Set horizontal radius size.	Range is "[1, 1024]" and default value
+	   is 1.
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       sizeY
+	   Set vertical radius size. Range is "[1, 1024]" and default value is
+	   0. If zero, "sizeX" value will be used.
+
+       Example
+
+       o   Apply average blur filter with horizontal and vertical size of 3,
+	   setting each pixel of the output to the average value of the 7x7
+	   region centered on it in the input. For pixels on the edges of the
+	   image, the region does not extend beyond the image boundaries, and
+	   so out-of-range coordinates are not used in the calculations.
+
+		   -i INPUT -vf "hwupload, avgblur_opencl=3, hwdownload" OUTPUT
+
+   boxblur_opencl
+       Apply a boxblur algorithm to the input video.
+
+       It accepts the following parameters:
+
+       luma_radius, lr
+       luma_power, lp
+       chroma_radius, cr
+       chroma_power, cp
+       alpha_radius, ar
+       alpha_power, ap
+
+       A description of the accepted options follows.
+
+       luma_radius, lr
+       chroma_radius, cr
+       alpha_radius, ar
+	   Set an expression for the box radius in pixels used for blurring
+	   the corresponding input plane.
+
+	   The radius value must be a non-negative number, and must not be
+	   greater than the value of the expression "min(w,h)/2" for the luma
+	   and alpha planes, and of "min(cw,ch)/2" for the chroma planes.
+
+	   Default value for luma_radius is "2". If not specified,
+	   chroma_radius and alpha_radius default to the corresponding value
+	   set for luma_radius.
+
+	   The expressions can contain the following constants:
+
+	   w
+	   h   The input width and height in pixels.
+
+	   cw
+	   ch  The input chroma image width and height in pixels.
+
+	   hsub
+	   vsub
+	       The horizontal and vertical chroma subsample values. For
+	       example, for the pixel format "yuv422p", hsub is 2 and vsub is
+	       1.
+
+       luma_power, lp
+       chroma_power, cp
+       alpha_power, ap
+	   Specify how many times the boxblur filter is applied to the
+	   corresponding plane.
+
+	   Default value for luma_power is 2. If not specified, chroma_power
+	   and alpha_power default to the corresponding value set for
+	   luma_power.
+
+	   A value of 0 will disable the effect.
+
+       Examples
+
+       Apply boxblur filter, setting each pixel of the output to the average
+       value of box-radiuses luma_radius, chroma_radius, alpha_radius for each
+       plane respectively. The filter will apply luma_power, chroma_power,
+       alpha_power times onto the corresponding plane. For pixels on the edges
+       of the image, the radius does not extend beyond the image boundaries,
+       and so out-of-range coordinates are not used in the calculations.
+
+       o   Apply a boxblur filter with the luma, chroma, and alpha radius set
+	   to 2 and luma, chroma, and alpha power set to 3. The filter will
+	   run 3 times with box-radius set to 2 for every plane of the image.
+
+		   -i INPUT -vf "hwupload, boxblur_opencl=luma_radius=2:luma_power=3, hwdownload" OUTPUT
+		   -i INPUT -vf "hwupload, boxblur_opencl=2:3, hwdownload" OUTPUT
+
+       o   Apply a boxblur filter with luma radius set to 2, luma_power to 1,
+	   chroma_radius to 4, chroma_power to 5, alpha_radius to 3 and
+	   alpha_power to 7.
+
+	   For the luma plane, a 2x2 box radius will be run once.
+
+	   For the chroma plane, a 4x4 box radius will be run 5 times.
+
+	   For the alpha plane, a 3x3 box radius will be run 7 times.
+
+		   -i INPUT -vf "hwupload, boxblur_opencl=2:1:4:5:3:7, hwdownload" OUTPUT
+
+   colorkey_opencl
+       RGB colorspace color keying.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will be replaced with transparency.
+
+       similarity
+	   Similarity percentage with the key color.
+
+	   0.01 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.
+
+	   0.0 makes pixels either fully transparent, or not transparent at
+	   all.
+
+	   Higher values result in semi-transparent pixels, with a higher
+	   transparency the more similar the pixels color is to the key color.
+
+       Examples
+
+       o   Make every semi-green pixel in the input transparent with some
+	   slight blending:
+
+		   -i INPUT -vf "hwupload, colorkey_opencl=green:0.3:0.1, hwdownload" OUTPUT
+
+   convolution_opencl
+       Apply convolution of 3x3, 5x5, 7x7 matrix.
+
+       The filter accepts the following options:
+
+       0m
+       1m
+       2m
+       3m  Set matrix for each plane.  Matrix is sequence of 9, 25 or 49
+	   signed numbers.  Default value for each plane is "0 0 0 0 1 0 0 0
+	   0".
+
+       0rdiv
+       1rdiv
+       2rdiv
+       3rdiv
+	   Set multiplier for calculated value for each plane.	If unset or 0,
+	   it will be sum of all matrix elements.  The option value must be a
+	   float number greater or equal to 0.0. Default value is 1.0.
+
+       0bias
+       1bias
+       2bias
+       3bias
+	   Set bias for each plane. This value is added to the result of the
+	   multiplication.  Useful for making the overall image brighter or
+	   darker.  The option value must be a float number greater or equal
+	   to 0.0. Default value is 0.0.
+
+       Examples
+
+       o   Apply sharpen:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0, hwdownload" OUTPUT
+
+       o   Apply blur:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1/9:1/9:1/9:1/9, hwdownload" OUTPUT
+
+       o   Apply edge enhance:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128, hwdownload" OUTPUT
+
+       o   Apply edge detect:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128, hwdownload" OUTPUT
+
+       o   Apply laplacian edge detector which includes diagonals:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:5:5:5:1:0:128:128:0, hwdownload" OUTPUT
+
+       o   Apply emboss:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2, hwdownload" OUTPUT
+
+   erosion_opencl
+       Apply erosion effect to the video.
+
+       This filter replaces the pixel by the local(3x3) minimum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane. Range is "[0, 65535]" and
+	   default value is 65535.  If 0, plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to.	Range is "[0, 255]"
+	   and default value is 255, i.e. all eight pixels are used.
+
+	   Flags to local 3x3 coordinates region centered on "x":
+
+	       1 2 3
+
+	       4 x 5
+
+	       6 7 8
+
+       Example
+
+       o   Apply erosion filter with threshold0 set to 30, threshold1 set 40,
+	   threshold2 set to 50 and coordinates set to 231, setting each pixel
+	   of the output to the local minimum between pixels: 1, 2, 3, 6, 7, 8
+	   of the 3x3 region centered on it in the input. If the difference
+	   between input pixel and local minimum is more then threshold of the
+	   corresponding plane, output pixel will be set to input pixel -
+	   threshold of corresponding plane.
+
+		   -i INPUT -vf "hwupload, erosion_opencl=30:40:50:coordinates=231, hwdownload" OUTPUT
+
+   deshake_opencl
+       Feature-point based video stabilization filter.
+
+       The filter accepts the following options:
+
+       tripod
+	   Simulates a tripod by preventing any camera movement whatsoever
+	   from the original frame. Defaults to 0.
+
+       debug
+	   Whether or not additional debug info should be displayed, both in
+	   the processed output and in the console.
+
+	   Note that in order to see console debug output you will also need
+	   to pass "-v verbose" to ffmpeg.
+
+	   Viewing point matches in the output video is only supported for RGB
+	   input.
+
+	   Defaults to 0.
+
+       adaptive_crop
+	   Whether or not to do a tiny bit of cropping at the borders to cut
+	   down on the amount of mirrored pixels.
+
+	   Defaults to 1.
+
+       refine_features
+	   Whether or not feature points should be refined at a sub-pixel
+	   level.
+
+	   This can be turned off for a slight performance gain at the cost of
+	   precision.
+
+	   Defaults to 1.
+
+       smooth_strength
+	   The strength of the smoothing applied to the camera path from 0.0
+	   to 1.0.
+
+	   1.0 is the maximum smoothing strength while values less than that
+	   result in less smoothing.
+
+	   0.0 causes the filter to adaptively choose a smoothing strength on
+	   a per-frame basis.
+
+	   Defaults to 0.0.
+
+       smooth_window_multiplier
+	   Controls the size of the smoothing window (the number of frames
+	   buffered to determine motion information from).
+
+	   The size of the smoothing window is determined by multiplying the
+	   framerate of the video by this number.
+
+	   Acceptable values range from 0.1 to 10.0.
+
+	   Larger values increase the amount of motion data available for
+	   determining how to smooth the camera path, potentially improving
+	   smoothness, but also increase latency and memory usage.
+
+	   Defaults to 2.0.
+
+       Examples
+
+       o   Stabilize a video with a fixed, medium smoothing strength:
+
+		   -i INPUT -vf "hwupload, deshake_opencl=smooth_strength=0.5, hwdownload" OUTPUT
+
+       o   Stabilize a video with debugging (both in console and in rendered
+	   video):
+
+		   -i INPUT -filter_complex "[0:v]format=rgba, hwupload, deshake_opencl=debug=1, hwdownload, format=rgba, format=yuv420p" -v verbose OUTPUT
+
+   dilation_opencl
+       Apply dilation effect to the video.
+
+       This filter replaces the pixel by the local(3x3) maximum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane. Range is "[0, 65535]" and
+	   default value is 65535.  If 0, plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to.	Range is "[0, 255]"
+	   and default value is 255, i.e. all eight pixels are used.
+
+	   Flags to local 3x3 coordinates region centered on "x":
+
+	       1 2 3
+
+	       4 x 5
+
+	       6 7 8
+
+       Example
+
+       o   Apply dilation filter with threshold0 set to 30, threshold1 set 40,
+	   threshold2 set to 50 and coordinates set to 231, setting each pixel
+	   of the output to the local maximum between pixels: 1, 2, 3, 6, 7, 8
+	   of the 3x3 region centered on it in the input. If the difference
+	   between input pixel and local maximum is more then threshold of the
+	   corresponding plane, output pixel will be set to input pixel +
+	   threshold of corresponding plane.
+
+		   -i INPUT -vf "hwupload, dilation_opencl=30:40:50:coordinates=231, hwdownload" OUTPUT
+
+   nlmeans_opencl
+       Non-local Means denoise filter through OpenCL, this filter accepts same
+       options as nlmeans.
+
+   overlay_opencl
+       Overlay one video on top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.  This filter requires same
+       memory layout for all the inputs. So, format conversion may be needed.
+
+       The filter accepts the following options:
+
+       x   Set the x coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+       y   Set the y coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+       Examples
+
+       o   Overlay an image LOGO at the top-left corner of the INPUT video.
+	   Both inputs are yuv420p format.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuv420p, hwupload[b], [a][b]overlay_opencl, hwdownload" OUTPUT
+
+       o   The inputs have same memory layout for color channels , the overlay
+	   has additional alpha plane, like INPUT is yuv420p, and the LOGO is
+	   yuva420p.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuva420p, hwupload[b], [a][b]overlay_opencl, hwdownload" OUTPUT
+
+   pad_opencl
+       Add paddings to the input image, and place the original input at the
+       provided x, y coordinates.
+
+       It accepts the following options:
+
+       width, w
+       height, h
+	   Specify an expression for the size of the output image with the
+	   paddings added. If the value for width or height is 0, the
+	   corresponding input size is used for the output.
+
+	   The width expression can reference the value set by the height
+	   expression, and vice versa.
+
+	   The default value of width and height is 0.
+
+       x
+       y   Specify the offsets to place the input image at within the padded
+	   area, with respect to the top/left border of the output image.
+
+	   The x expression can reference the value set by the y expression,
+	   and vice versa.
+
+	   The default value of x and y is 0.
+
+	   If x or y evaluate to a negative number, they'll be changed so the
+	   input image is centered on the padded area.
+
+       color
+	   Specify the color of the padded area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+       aspect
+	   Pad to an aspect instead to a resolution.
+
+       The value for the width, height, x, and y options are expressions
+       containing the following constants:
+
+       in_w
+       in_h
+	   The input video width and height.
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output width and height (the size of the padded area), as
+	   specified by the width and height expressions.
+
+       ow
+       oh  These are the same as out_w and out_h.
+
+       x
+       y   The x and y offsets as specified by the x and y expressions, or NAN
+	   if not yet specified.
+
+       a   same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (iw / ih) * sar
+
+   prewitt_opencl
+       Apply the Prewitt operator
+       (<https://en.wikipedia.org/wiki/Prewitt_operator>) to input video
+       stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.  Range is
+	   "[0.0, 65535]" and default value is 1.0.
+
+       delta
+	   Set value which will be added to filtered result.  Range is
+	   "[-65535, 65535]" and default value is 0.0.
+
+       Example
+
+       o   Apply the Prewitt operator with scale set to 2 and delta set to 10.
+
+		   -i INPUT -vf "hwupload, prewitt_opencl=scale=2:delta=10, hwdownload" OUTPUT
+
+   program_opencl
+       Filter video using an OpenCL program.
+
+       source
+	   OpenCL program source file.
+
+       kernel
+	   Kernel name in program.
+
+       inputs
+	   Number of inputs to the filter.  Defaults to 1.
+
+       size, s
+	   Size of output frames.  Defaults to the same as the first input.
+
+       The "program_opencl" filter also supports the framesync options.
+
+       The program source file must contain a kernel function with the given
+       name, which will be run once for each plane of the output.  Each run on
+       a plane gets enqueued as a separate 2D global NDRange with one work-
+       item for each pixel to be generated.  The global ID offset for each
+       work-item is therefore the coordinates of a pixel in the destination
+       image.
+
+       The kernel function needs to take the following arguments:
+
+       o   Destination image, __write_only image2d_t.
+
+	   This image will become the output; the kernel should write all of
+	   it.
+
+       o   Frame index, unsigned int.
+
+	   This is a counter starting from zero and increasing by one for each
+	   frame.
+
+       o   Source images, __read_only image2d_t.
+
+	   These are the most recent images on each input.  The kernel may
+	   read from them to generate the output, but they can't be written
+	   to.
+
+       Example programs:
+
+       o   Copy the input to the output (output must be the same size as the
+	   input).
+
+		   __kernel void copy(__write_only image2d_t destination,
+				      unsigned int index,
+				      __read_only  image2d_t source)
+		   {
+		       const sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE;
+
+		       int2 location = (int2)(get_global_id(0), get_global_id(1));
+
+		       float4 value = read_imagef(source, sampler, location);
+
+		       write_imagef(destination, location, value);
+		   }
+
+       o   Apply a simple transformation, rotating the input by an amount
+	   increasing with the index counter.  Pixel values are linearly
+	   interpolated by the sampler, and the output need not have the same
+	   dimensions as the input.
+
+		   __kernel void rotate_image(__write_only image2d_t dst,
+					      unsigned int index,
+					      __read_only  image2d_t src)
+		   {
+		       const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+						  CLK_FILTER_LINEAR);
+
+		       float angle = (float)index / 100.0f;
+
+		       float2 dst_dim = convert_float2(get_image_dim(dst));
+		       float2 src_dim = convert_float2(get_image_dim(src));
+
+		       float2 dst_cen = dst_dim / 2.0f;
+		       float2 src_cen = src_dim / 2.0f;
+
+		       int2   dst_loc = (int2)(get_global_id(0), get_global_id(1));
+
+		       float2 dst_pos = convert_float2(dst_loc) - dst_cen;
+		       float2 src_pos = {
+			   cos(angle) * dst_pos.x - sin(angle) * dst_pos.y,
+			   sin(angle) * dst_pos.x + cos(angle) * dst_pos.y
+		       };
+		       src_pos = src_pos * src_dim / dst_dim;
+
+		       float2 src_loc = src_pos + src_cen;
+
+		       if (src_loc.x < 0.0f	 || src_loc.y < 0.0f ||
+			   src_loc.x > src_dim.x || src_loc.y > src_dim.y)
+			   write_imagef(dst, dst_loc, 0.5f);
+		       else
+			   write_imagef(dst, dst_loc, read_imagef(src, sampler, src_loc));
+		   }
+
+       o   Blend two inputs together, with the amount of each input used
+	   varying with the index counter.
+
+		   __kernel void blend_images(__write_only image2d_t dst,
+					      unsigned int index,
+					      __read_only  image2d_t src1,
+					      __read_only  image2d_t src2)
+		   {
+		       const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+						  CLK_FILTER_LINEAR);
+
+		       float blend = (cos((float)index / 50.0f) + 1.0f) / 2.0f;
+
+		       int2  dst_loc = (int2)(get_global_id(0), get_global_id(1));
+		       int2 src1_loc = dst_loc * get_image_dim(src1) / get_image_dim(dst);
+		       int2 src2_loc = dst_loc * get_image_dim(src2) / get_image_dim(dst);
+
+		       float4 val1 = read_imagef(src1, sampler, src1_loc);
+		       float4 val2 = read_imagef(src2, sampler, src2_loc);
+
+		       write_imagef(dst, dst_loc, val1 * blend + val2 * (1.0f - blend));
+		   }
+
+   remap_opencl
+       Remap pixels using 2nd: Xmap and 3rd: Ymap input video stream.
+
+       Destination pixel at position (X, Y) will be picked from source (x, y)
+       position where x = Xmap(X, Y) and y = Ymap(X, Y). If mapping values are
+       out of range, zero value for pixel will be used for destination pixel.
+
+       Xmap and Ymap input video streams must be of same dimensions. Output
+       video stream will have Xmap/Ymap video stream dimensions.  Xmap and
+       Ymap input video streams are 32bit float pixel format, single channel.
+
+       interp
+	   Specify interpolation used for remapping of pixels.	Allowed values
+	   are "near" and "linear".  Default value is "linear".
+
+       fill
+	   Specify the color of the unmapped pixels. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+	   Default color is "black".
+
+   roberts_opencl
+       Apply the Roberts cross operator
+       (<https://en.wikipedia.org/wiki/Roberts_cross>) to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.  Range is
+	   "[0.0, 65535]" and default value is 1.0.
+
+       delta
+	   Set value which will be added to filtered result.  Range is
+	   "[-65535, 65535]" and default value is 0.0.
+
+       Example
+
+       o   Apply the Roberts cross operator with scale set to 2 and delta set
+	   to 10
+
+		   -i INPUT -vf "hwupload, roberts_opencl=scale=2:delta=10, hwdownload" OUTPUT
+
+   sobel_opencl
+       Apply the Sobel operator
+       (<https://en.wikipedia.org/wiki/Sobel_operator>) to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.  Range is
+	   "[0.0, 65535]" and default value is 1.0.
+
+       delta
+	   Set value which will be added to filtered result.  Range is
+	   "[-65535, 65535]" and default value is 0.0.
+
+       Example
+
+       o   Apply sobel operator with scale set to 2 and delta set to 10
+
+		   -i INPUT -vf "hwupload, sobel_opencl=scale=2:delta=10, hwdownload" OUTPUT
+
+   tonemap_opencl
+       Perform HDR(PQ/HLG) to SDR conversion with tone-mapping.
+
+       It accepts the following parameters:
+
+       tonemap
+	   Specify the tone-mapping operator to be used. Same as tonemap
+	   option in tonemap.
+
+       param
+	   Tune the tone mapping algorithm. same as param option in tonemap.
+
+       desat
+	   Apply desaturation for highlights that exceed this level of
+	   brightness. The higher the parameter, the more color information
+	   will be preserved. This setting helps prevent unnaturally blown-out
+	   colors for super-highlights, by (smoothly) turning into white
+	   instead. This makes images feel more natural, at the cost of
+	   reducing information about out-of-range colors.
+
+	   The default value is 0.5, and the algorithm here is a little
+	   different from the cpu version tonemap currently. A setting of 0.0
+	   disables this option.
+
+       threshold
+	   The tonemapping algorithm parameters is fine-tuned per each scene.
+	   And a threshold is used to detect whether the scene has changed or
+	   not. If the distance between the current frame average brightness
+	   and the current running average exceeds a threshold value, we would
+	   re-calculate scene average and peak brightness.  The default value
+	   is 0.2.
+
+       format
+	   Specify the output pixel format.
+
+	   Currently supported formats are:
+
+	   p010
+	   nv12
+       range, r
+	   Set the output color range.
+
+	   Possible values are:
+
+	   tv/mpeg
+	   pc/jpeg
+
+	   Default is same as input.
+
+       primaries, p
+	   Set the output color primaries.
+
+	   Possible values are:
+
+	   bt709
+	   bt2020
+
+	   Default is same as input.
+
+       transfer, t
+	   Set the output transfer characteristics.
+
+	   Possible values are:
+
+	   bt709
+	   bt2020
+
+	   Default is bt709.
+
+       matrix, m
+	   Set the output colorspace matrix.
+
+	   Possible value are:
+
+	   bt709
+	   bt2020
+
+	   Default is same as input.
+
+       Example
+
+       o   Convert HDR(PQ/HLG) video to bt2020-transfer-characteristic p010
+	   format using linear operator.
+
+		   -i INPUT -vf "format=p010,hwupload,tonemap_opencl=t=bt2020:tonemap=linear:format=p010,hwdownload,format=p010" OUTPUT
+
+   unsharp_opencl
+       Sharpen or blur the input video.
+
+       It accepts the following parameters:
+
+       luma_msize_x, lx
+	   Set the luma matrix horizontal size.  Range is "[1, 23]" and
+	   default value is 5.
+
+       luma_msize_y, ly
+	   Set the luma matrix vertical size.  Range is "[1, 23]" and default
+	   value is 5.
+
+       luma_amount, la
+	   Set the luma effect strength.  Range is "[-10, 10]" and default
+	   value is 1.0.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+       chroma_msize_x, cx
+	   Set the chroma matrix horizontal size.  Range is "[1, 23]" and
+	   default value is 5.
+
+       chroma_msize_y, cy
+	   Set the chroma matrix vertical size.  Range is "[1, 23]" and
+	   default value is 5.
+
+       chroma_amount, ca
+	   Set the chroma effect strength.  Range is "[-10, 10]" and default
+	   value is 0.0.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+       All parameters are optional and default to the equivalent of the string
+       '5:5:1.0:5:5:0.0'.
+
+       Examples
+
+       o   Apply strong luma sharpen effect:
+
+		   -i INPUT -vf "hwupload, unsharp_opencl=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5, hwdownload" OUTPUT
+
+       o   Apply a strong blur of both luma and chroma parameters:
+
+		   -i INPUT -vf "hwupload, unsharp_opencl=7:7:-2:7:7:-2, hwdownload" OUTPUT
+
+   xfade_opencl
+       Cross fade two videos with custom transition effect by using OpenCL.
+
+       It accepts the following options:
+
+       transition
+	   Set one of possible transition effects.
+
+	   custom
+	       Select custom transition effect, the actual transition
+	       description will be picked from source and kernel options.
+
+	   fade
+	   wipeleft
+	   wiperight
+	   wipeup
+	   wipedown
+	   slideleft
+	   slideright
+	   slideup
+	   slidedown
+	       Default transition is fade.
+
+       source
+	   OpenCL program source file for custom transition.
+
+       kernel
+	   Set name of kernel to use for custom transition from program source
+	   file.
+
+       duration
+	   Set duration of video transition.
+
+       offset
+	   Set time of start of transition relative to first video.
+
+       The program source file must contain a kernel function with the given
+       name, which will be run once for each plane of the output.  Each run on
+       a plane gets enqueued as a separate 2D global NDRange with one work-
+       item for each pixel to be generated.  The global ID offset for each
+       work-item is therefore the coordinates of a pixel in the destination
+       image.
+
+       The kernel function needs to take the following arguments:
+
+       o   Destination image, __write_only image2d_t.
+
+	   This image will become the output; the kernel should write all of
+	   it.
+
+       o   First Source image, __read_only image2d_t.  Second Source image,
+	   __read_only image2d_t.
+
+	   These are the most recent images on each input.  The kernel may
+	   read from them to generate the output, but they can't be written
+	   to.
+
+       o   Transition progress, float. This value is always between 0 and 1
+	   inclusive.
+
+       Example programs:
+
+       o   Apply dots curtain transition effect:
+
+		   __kernel void blend_images(__write_only image2d_t dst,
+					      __read_only  image2d_t src1,
+					      __read_only  image2d_t src2,
+					      float progress)
+		   {
+		       const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+						  CLK_FILTER_LINEAR);
+		       int2  p = (int2)(get_global_id(0), get_global_id(1));
+		       float2 rp = (float2)(get_global_id(0), get_global_id(1));
+		       float2 dim = (float2)(get_image_dim(src1).x, get_image_dim(src1).y);
+		       rp = rp / dim;
+
+		       float2 dots = (float2)(20.0, 20.0);
+		       float2 center = (float2)(0,0);
+		       float2 unused;
+
+		       float4 val1 = read_imagef(src1, sampler, p);
+		       float4 val2 = read_imagef(src2, sampler, p);
+		       bool next = distance(fract(rp * dots, &unused), (float2)(0.5, 0.5)) < (progress / distance(rp, center));
+
+		       write_imagef(dst, p, next ? val1 : val2);
+		   }
+
+VAAPI VIDEO FILTERS
+       VAAPI Video filters are usually used with VAAPI decoder and VAAPI
+       encoder. Below is a description of VAAPI video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-vaapi".
+
+       To use vaapi filters, you need to setup the vaapi device correctly. For
+       more information, please read
+       <https://trac.ffmpeg.org/wiki/Hardware/VAAPI>
+
+   overlay_vaapi
+       Overlay one video on the top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.
+
+       The filter accepts the following options:
+
+       x
+       y   Set expressions for the x and y coordinates of the overlaid video
+	   on the main video.
+
+	   Default value is "0" for both expressions.
+
+       w
+       h   Set expressions for the width and height the overlaid video on the
+	   main video.
+
+	   Default values are 'overlay_iw' for 'w' and
+	   'overlay_ih*w/overlay_iw' for 'h'.
+
+	   The expressions can contain the following parameters:
+
+	   main_w, W
+	   main_h, H
+	       The main input width and height.
+
+	   overlay_iw
+	   overlay_ih
+	       The overlay input width and height.
+
+	   overlay_w, w
+	   overlay_h, h
+	       The overlay output width and height.
+
+	   overlay_x, x
+	   overlay_y, y
+	       Position of the overlay layer inside of main
+
+       alpha
+	   Set transparency of overlaid video. Allowed range is 0.0 to 1.0.
+	   Higher value means lower transparency.  Default value is 1.0.
+
+       eof_action
+	   See framesync.
+
+       shortest
+	   See framesync.
+
+       repeatlast
+	   See framesync.
+
+       This filter also supports the framesync options.
+
+       Examples
+
+       o   Overlay an image LOGO at the top-left corner of the INPUT video.
+	   Both inputs for this filter are yuv420p format.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuv420p, hwupload[b], [a][b]overlay_vaapi" OUTPUT
+
+       o   Overlay an image LOGO at the offset (200, 100) from the top-left
+	   corner of the INPUT video.  The inputs have same memory layout for
+	   color channels, the overlay has additional alpha plane, like INPUT
+	   is yuv420p, and the LOGO is yuva420p.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuva420p, hwupload[b], [a][b]overlay_vaapi=x=200:y=100:w=400:h=300:alpha=1.0, hwdownload, format=nv12" OUTPUT
+
+   tonemap_vaapi
+       Perform HDR(High Dynamic Range) to SDR(Standard Dynamic Range)
+       conversion with tone-mapping.  It maps the dynamic range of HDR10
+       content to the SDR content.  It currently only accepts HDR10 as input.
+
+       It accepts the following parameters:
+
+       format
+	   Specify the output pixel format.
+
+	   Currently supported formats are:
+
+	   p010
+	   nv12
+
+	   Default is nv12.
+
+       primaries, p
+	   Set the output color primaries.
+
+	   Default is same as input.
+
+       transfer, t
+	   Set the output transfer characteristics.
+
+	   Default is bt709.
+
+       matrix, m
+	   Set the output colorspace matrix.
+
+	   Default is same as input.
+
+       Example
+
+       o   Convert HDR(HDR10) video to bt2020-transfer-characteristic p010
+	   format
+
+		   tonemap_vaapi=format=p010:t=bt2020-10
+
+   hstack_vaapi
+       Stack input videos horizontally.
+
+       This is the VA-API variant of the hstack filter, each input stream may
+       have different height, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See hstack.
+
+       shortest
+	   See hstack.
+
+       height
+	   Set height of output. If set to 0, this filter will set height of
+	   output to height of the first input stream. Default value is 0.
+
+   vstack_vaapi
+       Stack input videos vertically.
+
+       This is the VA-API variant of the vstack filter, each input stream may
+       have different width, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See vstack.
+
+       shortest
+	   See vstack.
+
+       width
+	   Set width of output. If set to 0, this filter will set width of
+	   output to width of the first input stream. Default value is 0.
+
+   xstack_vaapi
+       Stack video inputs into custom layout.
+
+       This is the VA-API variant of the xstack filter,  each input stream may
+       have different size, this filter will scale down/up each input stream
+       to the given output size, or the size of the first input stream.
+
+       It accepts the following options:
+
+       inputs
+	   See xstack.
+
+       shortest
+	   See xstack.
+
+       layout
+	   See xstack.	Moreover, this permits the user to supply output size
+	   for each input stream.
+
+		   xstack_vaapi=inputs=4:layout=0_0_1920x1080|0_h0_1920x1080|w0_0_1920x1080|w0_h0_1920x1080
+
+       grid
+	   See xstack.
+
+       grid_tile_size
+	   Set output size for each input stream when grid is set. If this
+	   option is not set, this filter will set output size by default to
+	   the size of the first input stream. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+       fill
+	   See xstack.
+
+VULKAN VIDEO FILTERS
+       Below is a description of the currently available Vulkan video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-vulkan" and either "--enable-libglslang" or
+       "--enable-libshaderc".
+
+       Running Vulkan filters requires you to initialize a hardware device and
+       to pass that device to all filters in any filter graph.
+
+       -init_hw_device vulkan[=name][:device[,key=value...]]
+	   Initialise a new hardware device of type vulkan called name, using
+	   the given device parameters and options in key=value. The following
+	   options are supported:
+
+	   debug
+	       Switches validation layers on if set to 1.
+
+	   linear_images
+	       Allocates linear images. Does not apply to decoding.
+
+	   disable_multiplane
+	       Disables multiplane images. Does not apply to decoding.
+
+       -filter_hw_device name
+	   Pass the hardware device called name to all filters in any filter
+	   graph.
+
+       For more detailed information see
+       <https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options>
+
+       o   Example of choosing the first device and running nlmeans_vulkan
+	   filter with default parameters on it.
+
+		   -init_hw_device vulkan=vk:0 -filter_hw_device vk -i INPUT -vf "hwupload,nlmeans_vulkan,hwdownload" OUTPUT
+
+       As Vulkan filters are not able to access frame data in normal memory,
+       all frame data needs to be uploaded (hwupload) to hardware surfaces
+       connected to the appropriate device before being used and then
+       downloaded (hwdownload) back to normal memory. Note that hwupload will
+       upload to a frame with the same layout as the software frame, so it may
+       be necessary to add a format filter immediately before to get the input
+       into the right format and hwdownload does not support all formats on
+       the output - it is usually necessary to insert an additional format
+       filter immediately following in the graph to get the output in a
+       supported format.
+
+   avgblur_vulkan
+       Apply an average blur filter, implemented on the GPU using Vulkan.
+
+       The filter accepts the following options:
+
+       sizeX
+	   Set horizontal radius size.	Range is "[1, 32]" and default value
+	   is 3.
+
+       sizeY
+	   Set vertical radius size. Range is "[1, 32]" and default value is
+	   3.
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+   blend_vulkan
+       Blend two Vulkan frames into each other.
+
+       The "blend" filter takes two input streams and outputs one stream, the
+       first input is the "top" layer and second input is "bottom" layer.  By
+       default, the output terminates when the longest input terminates.
+
+       A description of the accepted options follows.
+
+       c0_mode
+       c1_mode
+       c2_mode
+       c3_mode
+       all_mode
+	   Set blend mode for specific pixel component or all pixel components
+	   in case of all_mode. Default value is "normal".
+
+	   Available values for component modes are:
+
+	   normal
+	   multiply
+
+   bwdif_vulkan
+       Deinterlacer using bwdif, the "Bob Weaver Deinterlacing Filter"
+       algorithm, implemented on the GPU using Vulkan.
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   The default value is "send_field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   chromaber_vulkan
+       Apply an effect that emulates chromatic aberration. Works best with RGB
+       inputs, but provides a similar effect with YCbCr inputs too.
+
+       dist_x
+	   Horizontal displacement multiplier. Each chroma pixel's position
+	   will be multiplied by this amount, starting from the center of the
+	   image. Default is 0.
+
+       dist_y
+	   Similarly, this sets the vertical displacement multiplier. Default
+	   is 0.
+
+   color_vulkan
+       Video source that creates a Vulkan frame of a solid color.  Useful for
+       benchmarking, or overlaying.
+
+       It accepts the following parameters:
+
+       color
+	   The color to use. Either a name, or a hexadecimal value.  The
+	   default value is "black".
+
+       size
+	   The size of the output frame. Default value is "1920x1080".
+
+       rate
+	   The framerate to output at. Default value is 60 frames per second.
+
+       duration
+	   The video duration. Default value is "-0.000001".
+
+       sar The video signal aspect ratio. Default value is "1/1".
+
+       format
+	   The pixel format of the output Vulkan frames. Default value is
+	   "yuv444p".
+
+       out_range
+	   Set the output YCbCr sample range.
+
+	   This allows the autodetected value to be overridden as well as
+	   allows forcing a specific value used for the output and encoder. If
+	   not specified, the range depends on the pixel format. Possible
+	   values:
+
+	   auto/unknown
+	       Choose automatically.
+
+	   jpeg/full/pc
+	       Set full range (0-255 in case of 8-bit luma).
+
+	   mpeg/limited/tv
+	       Set "MPEG" range (16-235 in case of 8-bit luma).
+
+   vflip_vulkan
+       Flips an image vertically.
+
+   hflip_vulkan
+       Flips an image horizontally.
+
+   flip_vulkan
+       Flips an image along both the vertical and horizontal axis.
+
+   gblur_vulkan
+       Apply Gaussian blur filter on Vulkan frames.
+
+       The filter accepts the following options:
+
+       sigma
+	   Set horizontal sigma, standard deviation of Gaussian blur. Default
+	   is 0.5.
+
+       sigmaV
+	   Set vertical sigma, if negative it will be same as "sigma".
+	   Default is "-1".
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       size
+	   Set the kernel size along the horizontal axis. Default is 19.
+
+       sizeV
+	   Set the kernel size along the vertical axis. Default is 0, which
+	   sets to use the same value as size.
+
+   nlmeans_vulkan
+       Denoise frames using Non-Local Means algorithm, implemented on the GPU
+       using Vulkan.  Supports more pixel formats than nlmeans or
+       nlmeans_opencl, including alpha channel support.
+
+       The filter accepts the following options.
+
+       s   Set denoising strength for all components. Default is 1.0. Must be
+	   in range [1.0, 100.0].
+
+       p   Set patch size for all planes. Default is 7. Must be odd number in
+	   range [0, 99].
+
+       r   Set research size. Default is 15. Must be odd number in range [0,
+	   99].
+
+       t   Set parallelism. Default is 36. Must be a number in the range [1,
+	   168].  Larger values may speed up processing, at the cost of more
+	   VRAM.  Lower values will slow it down, reducing VRAM usage.	Only
+	   supported on GPUs with atomic float operations (RDNA3+, Ampere+).
+
+       s0
+       s1
+       s2
+       s3  Set denoising strength for a specific component. Default is 1,
+	   equal to s.	Must be odd number in range [1, 100].
+
+       p0
+       p1
+       p2
+       p3  Set patch size for a specific component. Default is 7, equal to p.
+	   Must be odd number in range [0, 99].
+
+   overlay_vulkan
+       Overlay one video on top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.  This filter requires all
+       inputs to use the same pixel format. So, format conversion may be
+       needed.
+
+       The filter accepts the following options:
+
+       x   Set the x coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+       y   Set the y coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+   transpose_vt
+       Transpose rows with columns in the input video and optionally flip it.
+       For more in depth examples see the transpose video filter, which shares
+       mostly the same options.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip.
+	       (default)
+
+	   clock
+	       Rotate by 90 degrees clockwise.
+
+	   cclock
+	       Rotate by 90 degrees counterclockwise.
+
+	   clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip.
+
+	   hflip
+	       Flip the input video horizontally.
+
+	   vflip
+	       Flip the input video vertically.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition. (default)
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+   transpose_vulkan
+       Transpose rows with columns in the input video and optionally flip it.
+       For more in depth examples see the transpose video filter, which shares
+       mostly the same options.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip.
+	       (default)
+
+	   clock
+	       Rotate by 90 degrees clockwise.
+
+	   cclock
+	       Rotate by 90 degrees counterclockwise.
+
+	   clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition. (default)
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+QSV VIDEO FILTERS
+       Below is a description of the currently available QSV video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-libmfx" or "--enable-libvpl".
+
+       To use QSV filters, you need to setup the QSV device correctly. For
+       more information, please read
+       <https://trac.ffmpeg.org/wiki/Hardware/QuickSync>
+
+   hstack_qsv
+       Stack input videos horizontally.
+
+       This is the QSV variant of the hstack filter, each input stream may
+       have different height, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See hstack.
+
+       shortest
+	   See hstack.
+
+       height
+	   Set height of output. If set to 0, this filter will set height of
+	   output to height of the first input stream. Default value is 0.
+
+   vstack_qsv
+       Stack input videos vertically.
+
+       This is the QSV variant of the vstack filter, each input stream may
+       have different width, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See vstack.
+
+       shortest
+	   See vstack.
+
+       width
+	   Set width of output. If set to 0, this filter will set width of
+	   output to width of the first input stream. Default value is 0.
+
+   xstack_qsv
+       Stack video inputs into custom layout.
+
+       This is the QSV variant of the xstack filter.
+
+       It accepts the following options:
+
+       inputs
+	   See xstack.
+
+       shortest
+	   See xstack.
+
+       layout
+	   See xstack.	Moreover, this permits the user to supply output size
+	   for each input stream.
+
+		   xstack_qsv=inputs=4:layout=0_0_1920x1080|0_h0_1920x1080|w0_0_1920x1080|w0_h0_1920x1080
+
+       grid
+	   See xstack.
+
+       grid_tile_size
+	   Set output size for each input stream when grid is set. If this
+	   option is not set, this filter will set output size by default to
+	   the size of the first input stream. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+       fill
+	   See xstack.
+
+VIDEO SOURCES
+       Below is a description of the currently available video sources.
+
+   buffer
+       Buffer video frames, and make them available to the filter chain.
+
+       This source is mainly intended for a programmatic use, in particular
+       through the interface defined in libavfilter/buffersrc.h.
+
+       It accepts the following parameters:
+
+       video_size
+	   Specify the size (width and height) of the buffered video frames.
+	   For the syntax of this option, check the "Video size" section in
+	   the ffmpeg-utils manual.
+
+       width
+	   The input video width.
+
+       height
+	   The input video height.
+
+       pix_fmt
+	   A string representing the pixel format of the buffered video
+	   frames.  It may be a number corresponding to a pixel format, or a
+	   pixel format name.
+
+       time_base
+	   Specify the timebase assumed by the timestamps of the buffered
+	   frames.
+
+       frame_rate
+	   Specify the frame rate expected for the video stream.
+
+       colorspace
+	   A string representing the color space of the buffered video frames.
+	   It may be a number corresponding to a color space, or a color space
+	   name.
+
+       range
+	   A string representing the color range of the buffered video frames.
+	   It may be a number corresponding to a color range, or a color range
+	   name.
+
+       pixel_aspect, sar
+	   The sample (pixel) aspect ratio of the input video.
+
+       hw_frames_ctx
+	   When using a hardware pixel format, this should be a reference to
+	   an AVHWFramesContext describing input frames.
+
+       For example:
+
+	       buffer=width=320:height=240:pix_fmt=yuv410p:time_base=1/24:sar=1
+
+       will instruct the source to accept video frames with size 320x240 and
+       with format "yuv410p", assuming 1/24 as the timestamps timebase and
+       square pixels (1:1 sample aspect ratio).  Since the pixel format with
+       name "yuv410p" corresponds to the number 6 (check the enum
+       AVPixelFormat definition in libavutil/pixfmt.h), this example
+       corresponds to:
+
+	       buffer=size=320x240:pixfmt=6:time_base=1/24:pixel_aspect=1/1
+
+       Alternatively, the options can be specified as a flat string, but this
+       syntax is deprecated:
+
+       width:height:pix_fmt:time_base.num:time_base.den:pixel_aspect.num:pixel_aspect.den
+
+   cellauto
+       Create a pattern generated by an elementary cellular automaton.
+
+       The initial state of the cellular automaton can be defined through the
+       filename and pattern options. If such options are not specified an
+       initial state is created randomly.
+
+       At each new frame a new row in the video is filled with the result of
+       the cellular automaton next generation. The behavior when the whole
+       frame is filled is defined by the scroll option.
+
+       This source accepts the following options:
+
+       filename, f
+	   Read the initial cellular automaton state, i.e. the starting row,
+	   from the specified file.  In the file, each non-whitespace
+	   character is considered an alive cell, a newline will terminate the
+	   row, and further characters in the file will be ignored.
+
+       pattern, p
+	   Read the initial cellular automaton state, i.e. the starting row,
+	   from the specified string.
+
+	   Each non-whitespace character in the string is considered an alive
+	   cell, a newline will terminate the row, and further characters in
+	   the string will be ignored.
+
+       rate, r
+	   Set the video rate, that is the number of frames generated per
+	   second.  Default is 25.
+
+       random_fill_ratio, ratio
+	   Set the random fill ratio for the initial cellular automaton row.
+	   It is a floating point number value ranging from 0 to 1, defaults
+	   to 1/PHI.
+
+	   This option is ignored when a file or a pattern is specified.
+
+       random_seed, seed
+	   Set the seed for filling randomly the initial row, must be an
+	   integer included between 0 and UINT32_MAX. If not specified, or if
+	   explicitly set to -1, the filter will try to use a good random seed
+	   on a best effort basis.
+
+       rule
+	   Set the cellular automaton rule, it is a number ranging from 0 to
+	   255.  Default value is 110.
+
+       size, s
+	   Set the size of the output video. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+	   If filename or pattern is specified, the size is set by default to
+	   the width of the specified initial state row, and the height is set
+	   to width * PHI.
+
+	   If size is set, it must contain the width of the specified pattern
+	   string, and the specified pattern will be centered in the larger
+	   row.
+
+	   If a filename or a pattern string is not specified, the size value
+	   defaults to "320x518" (used for a randomly generated initial
+	   state).
+
+       scroll
+	   If set to 1, scroll the output upward when all the rows in the
+	   output have been already filled. If set to 0, the new generated row
+	   will be written over the top row just after the bottom row is
+	   filled.  Defaults to 1.
+
+       start_full, full
+	   If set to 1, completely fill the output with generated rows before
+	   outputting the first frame.	This is the default behavior, for
+	   disabling set the value to 0.
+
+       stitch
+	   If set to 1, stitch the left and right row edges together.  This is
+	   the default behavior, for disabling set the value to 0.
+
+       Examples
+
+       o   Read the initial state from pattern, and specify an output of size
+	   200x400.
+
+		   cellauto=f=pattern:s=200x400
+
+       o   Generate a random initial row with a width of 200 cells, with a
+	   fill ratio of 2/3:
+
+		   cellauto=ratio=2/3:s=200x200
+
+       o   Create a pattern generated by rule 18 starting by a single alive
+	   cell centered on an initial row with width 100:
+
+		   cellauto=p=@s=100x400:full=0:rule=18
+
+       o   Specify a more elaborated initial pattern:
+
+		   cellauto=p='@@ @ @@':s=100x400:full=0:rule=18
+
+   coreimagesrc
+       Video source generated on GPU using Apple's CoreImage API on OSX.
+
+       This video source is a specialized version of the coreimage video
+       filter.	Use a core image generator at the beginning of the applied
+       filterchain to generate the content.
+
+       The coreimagesrc video source accepts the following options:
+
+       list_generators
+	   List all available generators along with all their respective
+	   options as well as possible minimum and maximum values along with
+	   the default values.
+
+		   list_generators=true
+
+       size, s
+	   Specify the size of the sourced video. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   The default value is "320x240".
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       sar Set the sample aspect ratio of the sourced video.
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       Additionally, all options of the coreimage video filter are accepted.
+       A complete filterchain can be used for further processing of the
+       generated input without CPU-HOST transfer. See coreimage documentation
+       and examples for details.
+
+       Examples
+
+       o   Use CIQRCodeGenerator to create a QR code for the FFmpeg homepage,
+	   given as complete and escaped command-line for Apple's standard
+	   bash shell:
+
+		   ffmpeg -f lavfi -i coreimagesrc=s=100x100:filter=CIQRCodeGenerator@inputMessage=https\\\\\://FFmpeg.org/@inputCorrectionLevel=H -frames:v 1 QRCode.png
+
+	   This example is equivalent to the QRCode example of coreimage
+	   without the need for a nullsrc video source.
+
+   ddagrab
+       Captures the Windows Desktop via Desktop Duplication API.
+
+       The filter exclusively returns D3D11 Hardware Frames, for on-gpu
+       encoding or processing. So an explicit hwdownload is needed for any
+       kind of software processing.
+
+       It accepts the following options:
+
+       output_idx
+	   DXGI Output Index to capture.
+
+	   Usually corresponds to the index Windows has given the screen minus
+	   one, so it's starting at 0.
+
+	   Defaults to output 0.
+
+       draw_mouse
+	   Whether to draw the mouse cursor.
+
+	   Defaults to true.
+
+	   Only affects hardware cursors. If a game or application renders its
+	   own cursor, it'll always be captured.
+
+       framerate
+	   Maximum framerate at which the desktop will be captured - the
+	   interval between successive frames will not be smaller than the
+	   inverse of the framerate. When dup_frames is true (the default) and
+	   the desktop is not being updated often enough, the filter will
+	   duplicate a previous frame. Note that there is no background
+	   buffering going on, so when the filter is not polled often enough
+	   then the actual inter-frame interval may be significantly larger.
+
+	   Defaults to 30 FPS.
+
+       video_size
+	   Specify the size of the captured video.
+
+	   Defaults to the full size of the screen.
+
+	   Cropped from the bottom/right if smaller than screen size.
+
+       offset_x
+	   Horizontal offset of the captured video.
+
+       offset_y
+	   Vertical offset of the captured video.
+
+       output_fmt
+	   Desired filter output format.  Defaults to 8 Bit BGRA.
+
+	   It accepts the following values:
+
+	   auto
+	       Passes all supported output formats to DDA and returns what DDA
+	       decides to use.
+
+	   8bit
+	   bgra
+	       8 Bit formats always work, and DDA will convert to them if
+	       necessary.
+
+	   10bit
+	   x2bgr10
+	       Filter initialization will fail if 10 bit format is requested
+	       but unavailable.
+
+       dup_frames
+	   When this option is set to true (the default), the filter will
+	   duplicate frames when the desktop has not been updated in order to
+	   maintain approximately constant target framerate. When this option
+	   is set to false, the filter will wait for the desktop to be updated
+	   (inter-frame intervals may vary significantly in this case).
+
+       Examples
+
+       Capture primary screen and encode using nvenc:
+
+	       ffmpeg -f lavfi -i ddagrab -c:v h264_nvenc -cq 18 output.mp4
+
+       You can also skip the lavfi device and directly use the filter.	Also
+       demonstrates downloading the frame and encoding with libx264.  Explicit
+       output format specification is required in this case:
+
+	       ffmpeg -filter_complex ddagrab=output_idx=1:framerate=60,hwdownload,format=bgra -c:v libx264 -crf 18 output.mp4
+
+       If you want to capture only a subsection of the desktop, this can be
+       achieved by specifying a smaller size and its offsets into the screen:
+
+	       ddagrab=video_size=800x600:offset_x=100:offset_y=100
+
+   gradients
+       Generate several gradients.
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "640x480".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       c0, c1, c2, c3, c4, c5, c6, c7
+	   Set 8 colors. Default values for colors is to pick random one.
+
+       x0, y0, y0, y1
+	   Set gradient line source and destination points. If negative or out
+	   of range, random ones are picked.
+
+       nb_colors, n
+	   Set number of colors to use at once. Allowed range is from 2 to 8.
+	   Default value is 2.
+
+       seed
+	   Set seed for picking gradient line points.
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       speed
+	   Set speed of gradients rotation.
+
+       type, t
+	   Set type of gradients.  Available values are:
+
+	   linear
+	   radial
+	   circular
+	   spiral
+	   square
+
+	   Default type is linear.
+
+       Commands
+
+       This source supports the some above options as commands.
+
+   mandelbrot
+       Generate a Mandelbrot set fractal, and progressively zoom towards the
+       point specified with start_x and start_y.
+
+       This source accepts the following options:
+
+       end_pts
+	   Set the terminal pts value. Default value is 400.
+
+       end_scale
+	   Set the terminal scale value.  Must be a floating point value.
+	   Default value is 0.3.
+
+       inner
+	   Set the inner coloring mode, that is the algorithm used to draw the
+	   Mandelbrot fractal internal region.
+
+	   It shall assume one of the following values:
+
+	   black
+	       Set black mode.
+
+	   convergence
+	       Show time until convergence.
+
+	   mincol
+	       Set color based on point closest to the origin of the
+	       iterations.
+
+	   period
+	       Set period mode.
+
+	   Default value is mincol.
+
+       bailout
+	   Set the bailout value. Default value is 10.0.
+
+       maxiter
+	   Set the maximum of iterations performed by the rendering algorithm.
+	   Default value is 7189.
+
+       outer
+	   Set outer coloring mode.  It shall assume one of following values:
+
+	   iteration_count
+	       Set iteration count mode.
+
+	   normalized_iteration_count
+	       set normalized iteration count mode.
+
+	   Default value is normalized_iteration_count.
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "640x480".
+
+       start_scale
+	   Set the initial scale value. Default value is 3.0.
+
+       start_x
+	   Set the initial x position. Must be a floating point value between
+	   -100 and 100. Default value is
+	   -0.743643887037158704752191506114774.
+
+       start_y
+	   Set the initial y position. Must be a floating point value between
+	   -100 and 100. Default value is
+	   -0.131825904205311970493132056385139.
+
+   mptestsrc
+       Generate various test patterns, as generated by the MPlayer test
+       filter.
+
+       The size of the generated video is fixed, and is 256x256.  This source
+       is useful in particular for testing encoding features.
+
+       This source accepts the following options:
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       test, t
+	   Set the number or the name of the test to perform. Supported tests
+	   are:
+
+	   dc_luma
+	   dc_chroma
+	   freq_luma
+	   freq_chroma
+	   amp_luma
+	   amp_chroma
+	   cbp
+	   mv
+	   ring1
+	   ring2
+	   all
+	   max_frames, m
+	       Set the maximum number of frames generated for each test,
+	       default value is 30.
+
+	   Default value is "all", which will cycle through the list of all
+	   tests.
+
+       Some examples:
+
+	       mptestsrc=t=dc_luma
+
+       will generate a "dc_luma" test pattern.
+
+   frei0r_src
+       Provide a frei0r source.
+
+       To enable compilation of this filter you need to install the frei0r
+       header and configure FFmpeg with "--enable-frei0r".
+
+       This source accepts the following parameters:
+
+       size
+	   The size of the video to generate. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+       framerate
+	   The framerate of the generated video. It may be a string of the
+	   form num/den or a frame rate abbreviation.
+
+       filter_name
+	   The name to the frei0r source to load. For more information
+	   regarding frei0r and how to set the parameters, read the frei0r
+	   section in the video filters documentation.
+
+       filter_params
+	   A '|'-separated list of parameters to pass to the frei0r source.
+
+       For example, to generate a frei0r partik0l source with size 200x200 and
+       frame rate 10 which is overlaid on the overlay filter main input:
+
+	       frei0r_src=size=200x200:framerate=10:filter_name=partik0l:filter_params=1234 [overlay]; [in][overlay] overlay
+
+   life
+       Generate a life pattern.
+
+       This source is based on a generalization of John Conway's life game.
+
+       The sourced input represents a life grid, each pixel represents a cell
+       which can be in one of two possible states, alive or dead. Every cell
+       interacts with its eight neighbours, which are the cells that are
+       horizontally, vertically, or diagonally adjacent.
+
+       At each interaction the grid evolves according to the adopted rule,
+       which specifies the number of neighbor alive cells which will make a
+       cell stay alive or born. The rule option allows one to specify the rule
+       to adopt.
+
+       This source accepts the following options:
+
+       filename, f
+	   Set the file from which to read the initial grid state. In the
+	   file, each non-whitespace character is considered an alive cell,
+	   and newline is used to delimit the end of each row.
+
+	   If this option is not specified, the initial grid is generated
+	   randomly.
+
+       rate, r
+	   Set the video rate, that is the number of frames generated per
+	   second.  Default is 25.
+
+       random_fill_ratio, ratio
+	   Set the random fill ratio for the initial random grid. It is a
+	   floating point number value ranging from 0 to 1, defaults to 1/PHI.
+	   It is ignored when a file is specified.
+
+       random_seed, seed
+	   Set the seed for filling the initial random grid, must be an
+	   integer included between 0 and UINT32_MAX. If not specified, or if
+	   explicitly set to -1, the filter will try to use a good random seed
+	   on a best effort basis.
+
+       rule
+	   Set the life rule.
+
+	   A rule can be specified with a code of the kind "SNS/BNB", where NS
+	   and NB are sequences of numbers in the range 0-8, NS specifies the
+	   number of alive neighbor cells which make a live cell stay alive,
+	   and NB the number of alive neighbor cells which make a dead cell to
+	   become alive (i.e. to "born").  "s" and "b" can be used in place of
+	   "S" and "B", respectively.
+
+	   Alternatively a rule can be specified by an 18-bits integer. The 9
+	   high order bits are used to encode the next cell state if it is
+	   alive for each number of neighbor alive cells, the low order bits
+	   specify the rule for "borning" new cells. Higher order bits encode
+	   for an higher number of neighbor cells.  For example the number
+	   6153 = "(12<<9)+9" specifies a stay alive rule of 12 and a born
+	   rule of 9, which corresponds to "S23/B03".
+
+	   Default value is "S23/B3", which is the original Conway's game of
+	   life rule, and will keep a cell alive if it has 2 or 3 neighbor
+	   alive cells, and will born a new cell if there are three alive
+	   cells around a dead cell.
+
+       size, s
+	   Set the size of the output video. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+	   If filename is specified, the size is set by default to the same
+	   size of the input file. If size is set, it must contain the size
+	   specified in the input file, and the initial grid defined in that
+	   file is centered in the larger resulting area.
+
+	   If a filename is not specified, the size value defaults to
+	   "320x240" (used for a randomly generated initial grid).
+
+       stitch
+	   If set to 1, stitch the left and right grid edges together, and the
+	   top and bottom edges also. Defaults to 1.
+
+       mold
+	   Set cell mold speed. If set, a dead cell will go from death_color
+	   to mold_color with a step of mold. mold can have a value from 0 to
+	   255.
+
+       life_color
+	   Set the color of living (or new born) cells.
+
+       death_color
+	   Set the color of dead cells. If mold is set, this is the first
+	   color used to represent a dead cell.
+
+       mold_color
+	   Set mold color, for definitely dead and moldy cells.
+
+	   For the syntax of these 3 color options, check the "Color" section
+	   in the ffmpeg-utils manual.
+
+       Examples
+
+       o   Read a grid from pattern, and center it on a grid of size 300x300
+	   pixels:
+
+		   life=f=pattern:s=300x300
+
+       o   Generate a random grid of size 200x200, with a fill ratio of 2/3:
+
+		   life=ratio=2/3:s=200x200
+
+       o   Specify a custom rule for evolving a randomly generated grid:
+
+		   life=rule=S14/B34
+
+       o   Full example with slow death effect (mold) using ffplay:
+
+		   ffplay -f lavfi life=s=300x200:mold=10:r=60:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=1200:800:flags=16
+
+   qrencodesrc
+       Generate a QR code using the libqrencode library (see
+       <https://fukuchi.org/works/qrencode/>).
+
+       To enable the compilation of this source, you need to configure FFmpeg
+       with "--enable-libqrencode".
+
+       The QR code is generated from the provided text or text pattern. The
+       corresponding QR code is scaled and put in the video output according
+       to the specified output size options.
+
+       In case no text is specified, the QR code is not generated, but an
+       empty colored output is returned instead.
+
+       This source accepts the following options:
+
+       qrcode_width, q
+       padded_qrcode_width, Q
+	   Specify an expression for the width of the rendered QR code, with
+	   and without padding. The qrcode_width expression can reference the
+	   value set by the padded_qrcode_width expression, and vice versa.
+	   By default padded_qrcode_width is set to qrcode_width, meaning that
+	   there is no padding.
+
+	   These expressions are evaluated only once, when initializing the
+	   source.  See the qrencode Expressions section for details.
+
+	   Note that some of the constants are missing for the source (for
+	   example the x or t or Xn), since they only makes sense when
+	   evaluating the expression for each frame rather than at
+	   initialization time.
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       case_sensitive, cs
+	   Instruct libqrencode to use case sensitive encoding. This is
+	   enabled by default. This can be disabled to reduce the QR encoding
+	   size.
+
+       level, l
+	   Specify the QR encoding error correction level. With an higher
+	   correction level, the encoding size will increase but the code will
+	   be more robust to corruption.  Lower level is L.
+
+	   It accepts the following values:
+
+	   L
+	   M
+	   Q
+	   H
+       expansion
+	   Select how the input text is expanded. Can be either "none", or
+	   "normal" (default). See the qrencode Text expansion section for
+	   details.
+
+       text
+       textfile
+	   Define the text to be rendered. In case neither is specified, no QR
+	   is encoded (just an empty colored frame).
+
+	   In case expansion is enabled, the text is treated as a text
+	   template, using the qrencode expansion mechanism. See the qrencode
+	   Text expansion section for details.
+
+       background_color, bc
+       foreground_color, fc
+	   Set the QR code and background color. The default value of
+	   foreground_color is "black", the default value of background_color
+	   is "white".
+
+	   For the syntax of the color options, check the "Color" section in
+	   the ffmpeg-utils manual.
+
+       Examples
+
+       o   Generate a QR code encoding the specified text with the default
+	   size:
+
+		   qrencodesrc=text=www.ffmpeg.org
+
+       o   Same as below, but select blue on pink colors:
+
+		   qrencodesrc=text=www.ffmpeg.org:bc=pink:fc=blue
+
+       o   Generate a QR code with width of 200 pixels and padding, making the
+	   padded width 4/3 of the QR code width:
+
+		   qrencodesrc=text=www.ffmpeg.org:q=200:Q=4/3*q
+
+       o   Generate a QR code with padded width of 200 pixels and padding,
+	   making the QR code width 3/4 of the padded width:
+
+		   qrencodesrc=text=www.ffmpeg.org:Q=200:q=3/4*Q
+
+       o   Generate a QR code encoding the frame number:
+
+		   qrencodesrc=text=%{n}
+
+       o   Generate a QR code encoding the GMT timestamp:
+
+		   qrencodesrc=text=%{gmtime}
+
+       o   Generate a QR code encoding the timestamp expressed as a float:
+
+		   qrencodesrc=text=%{pts}
+
+   allrgb, allyuv, color, colorchart, colorspectrum, haldclutsrc, nullsrc,
+       pal75bars, pal100bars, rgbtestsrc, smptebars, smptehdbars, testsrc,
+       testsrc2, yuvtestsrc
+       The "allrgb" source returns frames of size 4096x4096 of all rgb colors.
+
+       The "allyuv" source returns frames of size 4096x4096 of all yuv colors.
+
+       The "color" source provides an uniformly colored input.
+
+       The "colorchart" source provides a colors checker chart.
+
+       The "colorspectrum" source provides a color spectrum input.
+
+       The "haldclutsrc" source provides an identity Hald CLUT. See also
+       haldclut filter.
+
+       The "nullsrc" source returns unprocessed video frames. It is mainly
+       useful to be employed in analysis / debugging tools, or as the source
+       for filters which ignore the input data.
+
+       The "pal75bars" source generates a color bars pattern, based on EBU PAL
+       recommendations with 75% color levels.
+
+       The "pal100bars" source generates a color bars pattern, based on EBU
+       PAL recommendations with 100% color levels.
+
+       The "rgbtestsrc" source generates an RGB test pattern useful for
+       detecting RGB vs BGR issues. You should see a red, green and blue
+       stripe from top to bottom.
+
+       The "smptebars" source generates a color bars pattern, based on the
+       SMPTE Engineering Guideline EG 1-1990.
+
+       The "smptehdbars" source generates a color bars pattern, based on the
+       SMPTE RP 219-2002.
+
+       The "testsrc" source generates a test video pattern, showing a color
+       pattern, a scrolling gradient and a timestamp. This is mainly intended
+       for testing purposes.
+
+       The "testsrc2" source is similar to testsrc, but supports more pixel
+       formats instead of just "rgb24". This allows using it as an input for
+       other tests without requiring a format conversion.
+
+       The "yuvtestsrc" source generates an YUV test pattern. You should see a
+       y, cb and cr stripe from top to bottom.
+
+       The sources accept the following parameters:
+
+       level
+	   Specify the level of the Hald CLUT, only available in the
+	   "haldclutsrc" source. A level of "N" generates a picture of "N*N*N"
+	   by "N*N*N" pixels to be used as identity matrix for 3D lookup
+	   tables. Each component is coded on a "1/(N*N)" scale.
+
+       color, c
+	   Specify the color of the source, only available in the "color"
+	   source. For the syntax of this option, check the "Color" section in
+	   the ffmpeg-utils manual.
+
+       size, s
+	   Specify the size of the sourced video. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   The default value is "320x240".
+
+	   This option is not available with the "allrgb", "allyuv", and
+	   "haldclutsrc" filters.
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+	   Since the frame rate is used as time base, all frames including the
+	   last one will have their full duration. If the specified duration
+	   is not a multiple of the frame duration, it will be rounded up.
+
+       sar Set the sample aspect ratio of the sourced video.
+
+       alpha
+	   Specify the alpha (opacity) of the background, only available in
+	   the "testsrc2" source. The value must be between 0 (fully
+	   transparent) and 255 (fully opaque, the default).
+
+       decimals, n
+	   Set the number of decimals to show in the timestamp, only available
+	   in the "testsrc" source.
+
+	   The displayed timestamp value will correspond to the original
+	   timestamp value multiplied by the power of 10 of the specified
+	   value. Default value is 0.
+
+       type
+	   Set the type of the color spectrum, only available in the
+	   "colorspectrum" source. Can be one of the following:
+
+	   black
+	   white
+	   all
+       patch_size
+	   Set patch size of single color patch, only available in the
+	   "colorchart" source. Default is "64x64".
+
+       preset
+	   Set colorchecker colors preset, only available in the "colorchart"
+	   source.
+
+	   Available values are:
+
+	   reference
+	   skintones
+
+	   Default value is "reference".
+
+       Examples
+
+       o   Generate a video with a duration of 5.3 seconds, with size 176x144
+	   and a frame rate of 10 frames per second:
+
+		   testsrc=duration=5.3:size=qcif:rate=10
+
+       o   The following graph description will generate a red source with an
+	   opacity of 0.2, with size "qcif" and a frame rate of 10 frames per
+	   second:
+
+		   color=c=red@0.2:s=qcif:r=10
+
+       o   If the input content is to be ignored, "nullsrc" can be used. The
+	   following command generates noise in the luma plane by employing
+	   the "geq" filter:
+
+		   nullsrc=s=256x256, geq=random(1)*255:128:128
+
+       Commands
+
+       The "color" source supports the following commands:
+
+       c, color
+	   Set the color of the created image. Accepts the same syntax of the
+	   corresponding color option.
+
+   openclsrc
+       Generate video using an OpenCL program.
+
+       source
+	   OpenCL program source file.
+
+       kernel
+	   Kernel name in program.
+
+       size, s
+	   Size of frames to generate.	This must be set.
+
+       format
+	   Pixel format to use for the generated frames.  This must be set.
+
+       rate, r
+	   Number of frames generated every second.  Default value is '25'.
+
+       For details of how the program loading works, see the program_opencl
+       filter.
+
+       Example programs:
+
+       o   Generate a colour ramp by setting pixel values from the position of
+	   the pixel in the output image.  (Note that this will work with all
+	   pixel formats, but the generated output will not be the same.)
+
+		   __kernel void ramp(__write_only image2d_t dst,
+				      unsigned int index)
+		   {
+		       int2 loc = (int2)(get_global_id(0), get_global_id(1));
+
+		       float4 val;
+		       val.xy = val.zw = convert_float2(loc) / convert_float2(get_image_dim(dst));
+
+		       write_imagef(dst, loc, val);
+		   }
+
+       o   Generate a Sierpinski carpet pattern, panning by a single pixel
+	   each frame.
+
+		   __kernel void sierpinski_carpet(__write_only image2d_t dst,
+						   unsigned int index)
+		   {
+		       int2 loc = (int2)(get_global_id(0), get_global_id(1));
+
+		       float4 value = 0.0f;
+		       int x = loc.x + index;
+		       int y = loc.y + index;
+		       while (x > 0 || y > 0) {
+			   if (x % 3 == 1 && y % 3 == 1) {
+			       value = 1.0f;
+			       break;
+			   }
+			   x /= 3;
+			   y /= 3;
+		       }
+
+		       write_imagef(dst, loc, value);
+		   }
+
+   sierpinski
+       Generate a Sierpinski carpet/triangle fractal, and randomly pan around.
+
+       This source accepts the following options:
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "640x480".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       seed
+	   Set seed which is used for random panning.
+
+       jump
+	   Set max jump for single pan destination. Allowed range is from 1 to
+	   10000.
+
+       type
+	   Set fractal type, can be default "carpet" or "triangle".
+
+   zoneplate
+       Generate a zoneplate test video pattern.
+
+       This source accepts the following options:
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "320x240".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       sar Set the sample aspect ratio of the sourced video.
+
+       precision
+	   Set precision in bits for look-up table for sine calculations.
+	   Default value is 10.  Allowed range is from 4 to 16.
+
+       xo  Set horizontal axis offset for output signal. Default value is 0.
+
+       yo  Set vertical axis offset for output signal. Default value is 0.
+
+       to  Set time axis offset for output signal. Default value is 0.
+
+       k0  Set 0-order, constant added to signal phase. Default value is 0.
+
+       kx  Set 1-order, phase factor multiplier for horizontal axis. Default
+	   value is 0.
+
+       ky  Set 1-order, phase factor multiplier for vertical axis. Default
+	   value is 0.
+
+       kt  Set 1-order, phase factor multiplier for time axis. Default value
+	   is 0.
+
+       kxt, kyt, kxy
+	   Set phase factor multipliers for combination of spatial and
+	   temporal axis.  Default value is 0.
+
+       kx2 Set 2-order, phase factor multiplier for horizontal axis. Default
+	   value is 0.
+
+       ky2 Set 2-order, phase factor multiplier for vertical axis. Default
+	   value is 0.
+
+       kt2 Set 2-order, phase factor multiplier for time axis. Default value
+	   is 0.
+
+       ku  Set the constant added to final phase to produce chroma-blue
+	   component of signal.  Default value is 0.
+
+       kv  Set the constant added to final phase to produce chroma-red
+	   component of signal.  Default value is 0.
+
+       Commands
+
+       This source supports the some above options as commands.
+
+       Examples
+
+       o   Generate horizontal color sine sweep:
+
+		   zoneplate=ku=512:kv=0:kt2=0:kx2=256:s=wvga:xo=-426:kt=11
+
+       o   Generate vertical color sine sweep:
+
+		   zoneplate=ku=512:kv=0:kt2=0:ky2=156:s=wvga:yo=-240:kt=11
+
+       o   Generate circular zone-plate:
+
+		   zoneplate=ku=512:kv=100:kt2=0:ky2=256:kx2=556:s=wvga:yo=0:kt=11
+
+VIDEO SINKS
+       Below is a description of the currently available video sinks.
+
+   buffersink
+       Buffer video frames, and make them available to the end of the filter
+       graph.
+
+       This sink is mainly intended for programmatic use, in particular
+       through the interface defined in libavfilter/buffersink.h or the
+       options system.
+
+       It accepts a pointer to an AVBufferSinkContext structure, which defines
+       the incoming buffers' formats, to be passed as the opaque parameter to
+       "avfilter_init_filter" for initialization.
+
+   nullsink
+       Null video sink: do absolutely nothing with the input video. It is
+       mainly useful as a template and for use in analysis / debugging tools.
+
+MULTIMEDIA FILTERS
+       Below is a description of the currently available multimedia filters.
+
+   a3dscope
+       Convert input audio to 3d scope video output.
+
+       The filter accepts the following options:
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "hd720".
+
+       fov Set the camera field of view. Default is 90 degrees.  Allowed range
+	   is from 40 to 150.
+
+       roll
+	   Set the camera roll.
+
+       pitch
+	   Set the camera pitch.
+
+       yaw Set the camera yaw.
+
+       xzoom
+	   Set the camera zoom on X-axis.
+
+       yzoom
+	   Set the camera zoom on Y-axis.
+
+       zzoom
+	   Set the camera zoom on Z-axis.
+
+       xpos
+	   Set the camera position on X-axis.
+
+       ypos
+	   Set the camera position on Y-axis.
+
+       zpos
+	   Set the camera position on Z-axis.
+
+       length
+	   Set the length of displayed audio waves in number of frames.
+
+       Commands
+
+       Filter supports the some above options as commands.
+
+   abitscope
+       Convert input audio to a video output, displaying the audio bit scope.
+
+       The filter accepts the following options:
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "1024x256".
+
+       colors
+	   Specify list of colors separated by space or by '|' which will be
+	   used to draw channels. Unrecognized or missing colors will be
+	   replaced by white color.
+
+       mode, m
+	   Set output mode. Can be "bars" or "trace". Default is "bars".
+
+   adrawgraph
+       Draw a graph using input audio metadata.
+
+       See drawgraph
+
+   agraphmonitor
+       See graphmonitor.
+
+   ahistogram
+       Convert input audio to a video output, displaying the volume histogram.
+
+       The filter accepts the following options:
+
+       dmode
+	   Specify how histogram is calculated.
+
+	   It accepts the following values:
+
+	   single
+	       Use single histogram for all channels.
+
+	   separate
+	       Use separate histogram for each channel.
+
+	   Default is "single".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "hd720".
+
+       scale
+	   Set display scale.
+
+	   It accepts the following values:
+
+	   log logarithmic
+
+	   sqrt
+	       square root
+
+	   cbrt
+	       cubic root
+
+	   lin linear
+
+	   rlog
+	       reverse logarithmic
+
+	   Default is "log".
+
+       ascale
+	   Set amplitude scale.
+
+	   It accepts the following values:
+
+	   log logarithmic
+
+	   lin linear
+
+	   Default is "log".
+
+       acount
+	   Set how much frames to accumulate in histogram.  Default is 1.
+	   Setting this to -1 accumulates all frames.
+
+       rheight
+	   Set histogram ratio of window height.
+
+       slide
+	   Set sonogram sliding.
+
+	   It accepts the following values:
+
+	   replace
+	       replace old rows with new ones.
+
+	   scroll
+	       scroll from top to bottom.
+
+	   Default is "replace".
+
+       hmode
+	   Set histogram mode.
+
+	   It accepts the following values:
+
+	   abs Use absolute values of samples.
+
+	   sign
+	       Use untouched values of samples.
+
+	   Default is "abs".
+
+   aphasemeter
+       Measures phase of input audio, which is exported as metadata
+       "lavfi.aphasemeter.phase", representing mean phase of current audio
+       frame. A video output can also be produced and is enabled by default.
+       The audio is passed through as first output.
+
+       Audio will be rematrixed to stereo if it has a different channel
+       layout. Phase value is in range "[-1, 1]" where "-1" means left and
+       right channels are completely out of phase and 1 means channels are in
+       phase.
+
+       The filter accepts the following options, all related to its video
+       output:
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+       size, s
+	   Set the video size for the output. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.  Default
+	   value is "800x400".
+
+       rc
+       gc
+       bc  Specify the red, green, blue contrast. Default values are 2, 7 and
+	   1.  Allowed range is "[0, 255]".
+
+       mpc Set color which will be used for drawing median phase. If color is
+	   "none" which is default, no median phase value will be drawn.
+
+       video
+	   Enable video output. Default is enabled.
+
+       phasing detection
+
+       The filter also detects out of phase and mono sequences in stereo
+       streams.  It logs the sequence start, end and duration when it lasts
+       longer or as long as the minimum set.
+
+       The filter accepts the following options for this detection:
+
+       phasing
+	   Enable mono and out of phase detection. Default is disabled.
+
+       tolerance, t
+	   Set phase tolerance for mono detection, in amplitude ratio. Default
+	   is 0.  Allowed range is "[0, 1]".
+
+       angle, a
+	   Set angle threshold for out of phase detection, in degree. Default
+	   is 170.  Allowed range is "[90, 180]".
+
+       duration, d
+	   Set mono or out of phase duration until notification, expressed in
+	   seconds. Default is 2.
+
+       Examples
+
+       o   Complete example with ffmpeg to detect 1 second of mono with 0.001
+	   phase tolerance:
+
+		   ffmpeg -i stereo.wav -af aphasemeter=video=0:phasing=1:duration=1:tolerance=0.001 -f null -
+
+   avectorscope
+       Convert input audio to a video output, representing the audio vector
+       scope.
+
+       The filter is used to measure the difference between channels of stereo
+       audio stream. A monaural signal, consisting of identical left and right
+       signal, results in straight vertical line. Any stereo separation is
+       visible as a deviation from this line, creating a Lissajous figure.  If
+       the straight (or deviation from it) but horizontal line appears this
+       indicates that the left and right channels are out of phase.
+
+       The filter accepts the following options:
+
+       mode, m
+	   Set the vectorscope mode.
+
+	   Available values are:
+
+	   lissajous
+	       Lissajous rotated by 45 degrees.
+
+	   lissajous_xy
+	       Same as above but not rotated.
+
+	   polar
+	       Shape resembling half of circle.
+
+	   Default value is lissajous.
+
+       size, s
+	   Set the video size for the output. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.  Default
+	   value is "400x400".
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+       rc
+       gc
+       bc
+       ac  Specify the red, green, blue and alpha contrast. Default values are
+	   40, 160, 80 and 255.  Allowed range is "[0, 255]".
+
+       rf
+       gf
+       bf
+       af  Specify the red, green, blue and alpha fade. Default values are 15,
+	   10, 5 and 5.  Allowed range is "[0, 255]".
+
+       zoom
+	   Set the zoom factor. Default value is 1. Allowed range is "[0,
+	   10]".  Values lower than 1 will auto adjust zoom factor to maximal
+	   possible value.
+
+       draw
+	   Set the vectorscope drawing mode.
+
+	   Available values are:
+
+	   dot Draw dot for each sample.
+
+	   line
+	       Draw line between previous and current sample.
+
+	   aaline
+	       Draw anti-aliased line between previous and current sample.
+
+	   Default value is dot.
+
+       scale
+	   Specify amplitude scale of audio samples.
+
+	   Available values are:
+
+	   lin Linear.
+
+	   sqrt
+	       Square root.
+
+	   cbrt
+	       Cubic root.
+
+	   log Logarithmic.
+
+       swap
+	   Swap left channel axis with right channel axis.
+
+       mirror
+	   Mirror axis.
+
+	   none
+	       No mirror.
+
+	   x   Mirror only x axis.
+
+	   y   Mirror only y axis.
+
+	   xy  Mirror both axis.
+
+       Examples
+
+       o   Complete example using ffplay:
+
+		   ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1];
+				[a] avectorscope=zoom=1.3:rc=2:gc=200:bc=10:rf=1:gf=8:bf=7 [out0]'
+
+       Commands
+
+       This filter supports the all above options as commands except options
+       "size" and "rate".
+
+   bench, abench
+       Benchmark part of a filtergraph.
+
+       The filter accepts the following options:
+
+       action
+	   Start or stop a timer.
+
+	   Available values are:
+
+	   start
+	       Get the current time, set it as frame metadata (using the key
+	       "lavfi.bench.start_time"), and forward the frame to the next
+	       filter.
+
+	   stop
+	       Get the current time and fetch the "lavfi.bench.start_time"
+	       metadata from the input frame metadata to get the time
+	       difference. Time difference, average, maximum and minimum time
+	       (respectively "t", "avg", "max" and "min") are then printed.
+	       The timestamps are expressed in seconds.
+
+       Examples
+
+       o   Benchmark selectivecolor filter:
+
+		   bench=start,selectivecolor=reds=-.2 .12 -.49,bench=stop
+
+   concat
+       Concatenate audio and video streams, joining them together one after
+       the other.
+
+       The filter works on segments of synchronized video and audio streams.
+       All segments must have the same number of streams of each type, and
+       that will also be the number of streams at output.
+
+       The filter accepts the following options:
+
+       n   Set the number of segments. Default is 2.
+
+       v   Set the number of output video streams, that is also the number of
+	   video streams in each segment. Default is 1.
+
+       a   Set the number of output audio streams, that is also the number of
+	   audio streams in each segment. Default is 0.
+
+       unsafe
+	   Activate unsafe mode: do not fail if segments have a different
+	   format.
+
+       The filter has v+a outputs: first v video outputs, then a audio
+       outputs.
+
+       There are nx(v+a) inputs: first the inputs for the first segment, in
+       the same order as the outputs, then the inputs for the second segment,
+       etc.
+
+       Related streams do not always have exactly the same duration, for
+       various reasons including codec frame size or sloppy authoring. For
+       that reason, related synchronized streams (e.g. a video and its audio
+       track) should be concatenated at once. The concat filter will use the
+       duration of the longest stream in each segment (except the last one),
+       and if necessary pad shorter audio streams with silence.
+
+       For this filter to work correctly, all segments must start at timestamp
+       0.
+
+       All corresponding streams must have the same parameters in all
+       segments; the filtering system will automatically select a common pixel
+       format for video streams, and a common sample format, sample rate and
+       channel layout for audio streams, but other settings, such as
+       resolution, must be converted explicitly by the user.
+
+       Different frame rates are acceptable but will result in variable frame
+       rate at output; be sure to configure the output file to handle it.
+
+       Examples
+
+       o   Concatenate an opening, an episode and an ending, all in bilingual
+	   version (video in stream 0, audio in streams 1 and 2):
+
+		   ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv -filter_complex \
+		     '[0:0] [0:1] [0:2] [1:0] [1:1] [1:2] [2:0] [2:1] [2:2]
+		      concat=n=3:v=1:a=2 [v] [a1] [a2]' \
+		     -map '[v]' -map '[a1]' -map '[a2]' output.mkv
+
+       o   Concatenate two parts, handling audio and video separately, using
+	   the (a)movie sources, and adjusting the resolution:
+
+		   movie=part1.mp4, scale=512:288 [v1] ; amovie=part1.mp4 [a1] ;
+		   movie=part2.mp4, scale=512:288 [v2] ; amovie=part2.mp4 [a2] ;
+		   [v1] [v2] concat [outv] ; [a1] [a2] concat=v=0:a=1 [outa]
+
+	   Note that a desync will happen at the stitch if the audio and video
+	   streams do not have exactly the same duration in the first file.
+
+       Commands
+
+       This filter supports the following commands:
+
+       next
+	   Close the current segment and step to the next one
+
+   ebur128
+       EBU R128 scanner filter. This filter takes an audio stream and analyzes
+       its loudness level. By default, it logs a message at a frequency of
+       10Hz with the Momentary loudness (identified by "M"), Short-term
+       loudness ("S"), Integrated loudness ("I") and Loudness Range ("LRA").
+
+       The filter can only analyze streams which have sample format is double-
+       precision floating point. The input stream will be converted to this
+       specification, if needed. Users may need to insert aformat and/or
+       aresample filters after this filter to obtain the original parameters.
+
+       The filter also has a video output (see the video option) with a real
+       time graph to observe the loudness evolution. The graphic contains the
+       logged message mentioned above, so it is not printed anymore when this
+       option is set, unless the verbose logging is set. The main graphing
+       area contains the short-term loudness (3 seconds of analysis), and the
+       gauge on the right is for the momentary loudness (400 milliseconds),
+       but can optionally be configured to instead display short-term loudness
+       (see gauge).
+
+       The green area marks a  +/- 1LU target range around the target loudness
+       (-23LUFS by default, unless modified through target).
+
+       More information about the Loudness Recommendation EBU R128 on
+       <http://tech.ebu.ch/loudness>.
+
+       The filter accepts the following options:
+
+       video
+	   Activate the video output. The audio stream is passed unchanged
+	   whether this option is set or no. The video stream will be the
+	   first output stream if activated. Default is 0.
+
+       size
+	   Set the video size. This option is for video only. For the syntax
+	   of this option, check the "Video size" section in the ffmpeg-utils
+	   manual.  Default and minimum resolution is "640x480".
+
+       meter
+	   Set the EBU scale meter. Default is 9. Common values are 9 and 18,
+	   respectively for EBU scale meter +9 and EBU scale meter +18. Any
+	   other integer value between this range is allowed.
+
+       metadata
+	   Set metadata injection. If set to 1, the audio input will be
+	   segmented into 100ms output frames, each of them containing various
+	   loudness information in metadata.  All the metadata keys are
+	   prefixed with "lavfi.r128.".
+
+	   Default is 0.
+
+       framelog
+	   Force the frame logging level.
+
+	   Available values are:
+
+	   quiet
+	       logging disabled
+
+	   info
+	       information logging level
+
+	   verbose
+	       verbose logging level
+
+	   By default, the logging level is set to info. If the video or the
+	   metadata options are set, it switches to verbose.
+
+       peak
+	   Set peak mode(s).
+
+	   Available modes can be cumulated (the option is a "flag" type).
+	   Possible values are:
+
+	   none
+	       Disable any peak mode (default).
+
+	   sample
+	       Enable sample-peak mode.
+
+	       Simple peak mode looking for the higher sample value. It logs a
+	       message for sample-peak (identified by "SPK").
+
+	   true
+	       Enable true-peak mode.
+
+	       If enabled, the peak lookup is done on an over-sampled version
+	       of the input stream for better peak accuracy. It logs a message
+	       for true-peak.  (identified by "TPK") and true-peak per frame
+	       (identified by "FTPK").	This mode requires a build with
+	       "libswresample".
+
+       dualmono
+	   Treat mono input files as "dual mono". If a mono file is intended
+	   for playback on a stereo system, its EBU R128 measurement will be
+	   perceptually incorrect.  If set to "true", this option will
+	   compensate for this effect.	Multi-channel input files are not
+	   affected by this option.
+
+       panlaw
+	   Set a specific pan law to be used for the measurement of dual mono
+	   files.  This parameter is optional, and has a default value of
+	   -3.01dB.
+
+       target
+	   Set a specific target level (in LUFS) used as relative zero in the
+	   visualization.  This parameter is optional and has a default value
+	   of -23LUFS as specified by EBU R128. However, material published
+	   online may prefer a level of -16LUFS (e.g. for use with podcasts or
+	   video platforms).
+
+       gauge
+	   Set the value displayed by the gauge. Valid values are "momentary"
+	   and s "shortterm". By default the momentary value will be used, but
+	   in certain scenarios it may be more useful to observe the short
+	   term value instead (e.g.  live mixing).
+
+       scale
+	   Sets the display scale for the loudness. Valid parameters are
+	   "absolute" (in LUFS) or "relative" (LU) relative to the target.
+	   This only affects the video output, not the summary or continuous
+	   log output.
+
+       integrated
+	   Read-only exported value for measured integrated loudness, in LUFS.
+
+       range
+	   Read-only exported value for measured loudness range, in LU.
+
+       lra_low
+	   Read-only exported value for measured LRA low, in LUFS.
+
+       lra_high
+	   Read-only exported value for measured LRA high, in LUFS.
+
+       sample_peak
+	   Read-only exported value for measured sample peak, in dBFS.
+
+       true_peak
+	   Read-only exported value for measured true peak, in dBFS.
+
+       Examples
+
+       o   Real-time graph using ffplay, with a EBU scale meter +18:
+
+		   ffplay -f lavfi -i "amovie=input.mp3,ebur128=video=1:meter=18 [out0][out1]"
+
+       o   Run an analysis with ffmpeg:
+
+		   ffmpeg -nostats -i input.mp3 -filter_complex ebur128 -f null -
+
+   interleave, ainterleave
+       Temporally interleave frames from several inputs.
+
+       "interleave" works with video inputs, "ainterleave" with audio.
+
+       These filters read frames from several inputs and send the oldest
+       queued frame to the output.
+
+       Input streams must have well defined, monotonically increasing frame
+       timestamp values.
+
+       In order to submit one frame to output, these filters need to enqueue
+       at least one frame for each input, so they cannot work in case one
+       input is not yet terminated and will not receive incoming frames.
+
+       For example consider the case when one input is a "select" filter which
+       always drops input frames. The "interleave" filter will keep reading
+       from that input, but it will never be able to send new frames to output
+       until the input sends an end-of-stream signal.
+
+       Also, depending on inputs synchronization, the filters will drop frames
+       in case one input receives more frames than the other ones, and the
+       queue is already filled.
+
+       These filters accept the following options:
+
+       nb_inputs, n
+	   Set the number of different inputs, it is 2 by default.
+
+       duration
+	   How to determine the end-of-stream.
+
+	   longest
+	       The duration of the longest input. (default)
+
+	   shortest
+	       The duration of the shortest input.
+
+	   first
+	       The duration of the first input.
+
+       Examples
+
+       o   Interleave frames belonging to different streams using ffmpeg:
+
+		   ffmpeg -i bambi.avi -i pr0n.mkv -filter_complex "[0:v][1:v] interleave" out.avi
+
+       o   Add flickering blur effect:
+
+		   select='if(gt(random(0), 0.2), 1, 2)':n=2 [tmp], boxblur=2:2, [tmp] interleave
+
+   latency, alatency
+       Measure filtering latency.
+
+       Report previous filter filtering latency, delay in number of audio
+       samples for audio filters or number of video frames for video filters.
+
+       On end of input stream, filter will report min and max measured latency
+       for previous running filter in filtergraph.
+
+   metadata, ametadata
+       Manipulate frame metadata.
+
+       This filter accepts the following options:
+
+       mode
+	   Set mode of operation of the filter.
+
+	   Can be one of the following:
+
+	   select
+	       If both "value" and "key" is set, select frames which have such
+	       metadata. If only "key" is set, select every frame that has
+	       such key in metadata.
+
+	   add Add new metadata "key" and "value". If key is already available
+	       do nothing.
+
+	   modify
+	       Modify value of already present key.
+
+	   delete
+	       If "value" is set, delete only keys that have such value.
+	       Otherwise, delete key. If "key" is not set, delete all metadata
+	       values in the frame.
+
+	   print
+	       Print key and its value if metadata was found. If "key" is not
+	       set print all metadata values available in frame.
+
+       key Set key used with all modes. Must be set for all modes except
+	   "print" and "delete".
+
+       value
+	   Set metadata value which will be used. This option is mandatory for
+	   "modify" and "add" mode.
+
+       function
+	   Which function to use when comparing metadata value and "value".
+
+	   Can be one of following:
+
+	   same_str
+	       Values are interpreted as strings, returns true if metadata
+	       value is same as "value".
+
+	   starts_with
+	       Values are interpreted as strings, returns true if metadata
+	       value starts with the "value" option string.
+
+	   less
+	       Values are interpreted as floats, returns true if metadata
+	       value is less than "value".
+
+	   equal
+	       Values are interpreted as floats, returns true if "value" is
+	       equal with metadata value.
+
+	   greater
+	       Values are interpreted as floats, returns true if metadata
+	       value is greater than "value".
+
+	   expr
+	       Values are interpreted as floats, returns true if expression
+	       from option "expr" evaluates to true.
+
+	   ends_with
+	       Values are interpreted as strings, returns true if metadata
+	       value ends with the "value" option string.
+
+       expr
+	   Set expression which is used when "function" is set to "expr".  The
+	   expression is evaluated through the eval API and can contain the
+	   following constants:
+
+	   VALUE1, FRAMEVAL
+	       Float representation of "value" from metadata key.
+
+	   VALUE2, USERVAL
+	       Float representation of "value" as supplied by user in "value"
+	       option.
+
+       file
+	   If specified in "print" mode, output is written to the named file.
+	   Instead of plain filename any writable url can be specified.
+	   Filename ``-'' is a shorthand for standard output. If "file" option
+	   is not set, output is written to the log with AV_LOG_INFO loglevel.
+
+       direct
+	   Reduces buffering in print mode when output is written to a URL set
+	   using file.
+
+       Examples
+
+       o   Print all metadata values for frames with key
+	   "lavfi.signalstats.YDIF" with values between 0 and 1.
+
+		   signalstats,metadata=print:key=lavfi.signalstats.YDIF:value=0:function=expr:expr='between(VALUE1,0,1)'
+
+       o   Print silencedetect output to file metadata.txt.
+
+		   silencedetect,ametadata=mode=print:file=metadata.txt
+
+       o   Direct all metadata to a pipe with file descriptor 4.
+
+		   metadata=mode=print:file='pipe\:4'
+
+   perms, aperms
+       Set read/write permissions for the output frames.
+
+       These filters are mainly aimed at developers to test direct path in the
+       following filter in the filtergraph.
+
+       The filters accept the following options:
+
+       mode
+	   Select the permissions mode.
+
+	   It accepts the following values:
+
+	   none
+	       Do nothing. This is the default.
+
+	   ro  Set all the output frames read-only.
+
+	   rw  Set all the output frames directly writable.
+
+	   toggle
+	       Make the frame read-only if writable, and writable if read-
+	       only.
+
+	   random
+	       Set each output frame read-only or writable randomly.
+
+       seed
+	   Set the seed for the random mode, must be an integer included
+	   between 0 and "UINT32_MAX". If not specified, or if explicitly set
+	   to "-1", the filter will try to use a good random seed on a best
+	   effort basis.
+
+       Note: in case of auto-inserted filter between the permission filter and
+       the following one, the permission might not be received as expected in
+       that following filter. Inserting a format or aformat filter before the
+       perms/aperms filter can avoid this problem.
+
+   realtime, arealtime
+       Slow down filtering to match real time approximately.
+
+       These filters will pause the filtering for a variable amount of time to
+       match the output rate with the input timestamps.  They are similar to
+       the re option to "ffmpeg".
+
+       They accept the following options:
+
+       limit
+	   Time limit for the pauses. Any pause longer than that will be
+	   considered a timestamp discontinuity and reset the timer. Default
+	   is 2 seconds.
+
+       speed
+	   Speed factor for processing. The value must be a float larger than
+	   zero.  Values larger than 1.0 will result in faster than realtime
+	   processing, smaller will slow processing down. The limit is
+	   automatically adapted accordingly. Default is 1.0.
+
+	   A processing speed faster than what is possible without these
+	   filters cannot be achieved.
+
+       Commands
+
+       Both filters supports the all above options as commands.
+
+   segment, asegment
+       Split single input stream into multiple streams.
+
+       This filter does opposite of concat filters.
+
+       "segment" works on video frames, "asegment" on audio samples.
+
+       This filter accepts the following options:
+
+       timestamps
+	   Timestamps of output segments separated by '|'. The first segment
+	   will run from the beginning of the input stream. The last segment
+	   will run until the end of the input stream
+
+       frames, samples
+	   Exact frame/sample count to split the segments.
+
+       In all cases, prefixing an each segment with '+' will make it relative
+       to the previous segment.
+
+       Examples
+
+       o   Split input audio stream into three output audio streams, starting
+	   at start of input audio stream and storing that in 1st output audio
+	   stream, then following at 60th second and storing than in 2nd
+	   output audio stream, and last after 150th second of input audio
+	   stream store in 3rd output audio stream:
+
+		   asegment=timestamps="60|150"
+
+   select, aselect
+       Select frames to pass in output.
+
+       This filter accepts the following options:
+
+       expr, e
+	   Set expression, which is evaluated for each input frame.
+
+	   If the expression is evaluated to zero, the frame is discarded.
+
+	   If the evaluation result is negative or NaN, the frame is sent to
+	   the first output; otherwise it is sent to the output with index
+	   "ceil(val)-1", assuming that the input index starts from 0.
+
+	   For example a value of 1.2 corresponds to the output with index
+	   "ceil(1.2)-1 = 2-1 = 1", that is the second output.
+
+       outputs, n
+	   Set the number of outputs. The output to which to send the selected
+	   frame is based on the result of the evaluation. Default value is 1.
+
+       The expression can contain the following constants:
+
+       n   The (sequential) number of the filtered frame, starting from 0.
+
+       selected_n
+	   The (sequential) number of the selected frame, starting from 0.
+
+       prev_selected_n
+	   The sequential number of the last selected frame. It's NAN if
+	   undefined.
+
+       TB  The timebase of the input timestamps.
+
+       pts The PTS (Presentation TimeStamp) of the filtered frame, expressed
+	   in TB units. It's NAN if undefined.
+
+       t   The PTS of the filtered frame, expressed in seconds. It's NAN if
+	   undefined.
+
+       prev_pts
+	   The PTS of the previously filtered frame. It's NAN if undefined.
+
+       prev_selected_pts
+	   The PTS of the last previously filtered frame. It's NAN if
+	   undefined.
+
+       prev_selected_t
+	   The PTS of the last previously selected frame, expressed in
+	   seconds. It's NAN if undefined.
+
+       start_pts
+	   The first PTS in the stream which is not NAN. It remains NAN if not
+	   found.
+
+       start_t
+	   The first PTS, in seconds, in the stream which is not NAN. It
+	   remains NAN if not found.
+
+       pict_type (video only)
+	   The type of the filtered frame. It can assume one of the following
+	   values:
+
+	   I
+	   P
+	   B
+	   S
+	   SI
+	   SP
+	   BI
+       interlace_type (video only)
+	   The frame interlace type. It can assume one of the following
+	   values:
+
+	   PROGRESSIVE
+	       The frame is progressive (not interlaced).
+
+	   TOPFIRST
+	       The frame is top-field-first.
+
+	   BOTTOMFIRST
+	       The frame is bottom-field-first.
+
+       consumed_sample_n (audio only)
+	   the number of selected samples before the current frame
+
+       samples_n (audio only)
+	   the number of samples in the current frame
+
+       sample_rate (audio only)
+	   the input sample rate
+
+       key This is 1 if the filtered frame is a key-frame, 0 otherwise.
+
+       pos the position in the file of the filtered frame, -1 if the
+	   information is not available (e.g. for synthetic video);
+	   deprecated, do not use
+
+       scene (video only)
+	   value between 0 and 1 to indicate a new scene; a low value reflects
+	   a low probability for the current frame to introduce a new scene,
+	   while a higher value means the current frame is more likely to be
+	   one (see the example below)
+
+       concatdec_select
+	   The concat demuxer can select only part of a concat input file by
+	   setting an inpoint and an outpoint, but the output packets may not
+	   be entirely contained in the selected interval. By using this
+	   variable, it is possible to skip frames generated by the concat
+	   demuxer which are not exactly contained in the selected interval.
+
+	   This works by comparing the frame pts against the
+	   lavf.concat.start_time and the lavf.concat.duration packet metadata
+	   values which are also present in the decoded frames.
+
+	   The concatdec_select variable is -1 if the frame pts is at least
+	   start_time and either the duration metadata is missing or the frame
+	   pts is less than start_time + duration, 0 otherwise, and NaN if the
+	   start_time metadata is missing.
+
+	   That basically means that an input frame is selected if its pts is
+	   within the interval set by the concat demuxer.
+
+       The default value of the select expression is "1".
+
+       Examples
+
+       o   Select all frames in input:
+
+		   select
+
+	   The example above is the same as:
+
+		   select=1
+
+       o   Skip all frames:
+
+		   select=0
+
+       o   Select only I-frames:
+
+		   select='eq(pict_type\,I)'
+
+       o   Select one frame every 100:
+
+		   select='not(mod(n\,100))'
+
+       o   Select only frames contained in the 10-20 time interval:
+
+		   select=between(t\,10\,20)
+
+       o   Select only I-frames contained in the 10-20 time interval:
+
+		   select=between(t\,10\,20)*eq(pict_type\,I)
+
+       o   Select frames with a minimum distance of 10 seconds:
+
+		   select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
+
+       o   Use aselect to select only audio frames with samples number > 100:
+
+		   aselect='gt(samples_n\,100)'
+
+       o   Create a mosaic of the first scenes:
+
+		   ffmpeg -i video.avi -vf select='gt(scene\,0.4)',scale=160:120,tile -frames:v 1 preview.png
+
+	   Comparing scene against a value between 0.3 and 0.5 is generally a
+	   sane choice.
+
+       o   Send even and odd frames to separate outputs, and compose them:
+
+		   select=n=2:e='mod(n, 2)+1' [odd][even]; [odd] pad=h=2*ih [tmp]; [tmp][even] overlay=y=h
+
+       o   Select useful frames from an ffconcat file which is using inpoints
+	   and outpoints but where the source files are not intra frame only.
+
+		   ffmpeg -copyts -vsync 0 -segment_time_metadata 1 -i input.ffconcat -vf select=concatdec_select -af aselect=concatdec_select output.avi
+
+   sendcmd, asendcmd
+       Send commands to filters in the filtergraph.
+
+       These filters read commands to be sent to other filters in the
+       filtergraph.
+
+       "sendcmd" must be inserted between two video filters, "asendcmd" must
+       be inserted between two audio filters, but apart from that they act the
+       same way.
+
+       The specification of commands can be provided in the filter arguments
+       with the commands option, or in a file specified by the filename
+       option.
+
+       These filters accept the following options:
+
+       commands, c
+	   Set the commands to be read and sent to the other filters.
+
+       filename, f
+	   Set the filename of the commands to be read and sent to the other
+	   filters.
+
+       Commands syntax
+
+       A commands description consists of a sequence of interval
+       specifications, comprising a list of commands to be executed when a
+       particular event related to that interval occurs. The occurring event
+       is typically the current frame time entering or leaving a given time
+       interval.
+
+       An interval is specified by the following syntax:
+
+	       <START>[-<END>] <COMMANDS>;
+
+       The time interval is specified by the START and END times.  END is
+       optional and defaults to the maximum time.
+
+       The current frame time is considered within the specified interval if
+       it is included in the interval [START, END), that is when the time is
+       greater or equal to START and is lesser than END.
+
+       COMMANDS consists of a sequence of one or more command specifications,
+       separated by ",", relating to that interval.  The syntax of a command
+       specification is given by:
+
+	       [<FLAGS>] <TARGET> <COMMAND> <ARG>
+
+       FLAGS is optional and specifies the type of events relating to the time
+       interval which enable sending the specified command, and must be a non-
+       null sequence of identifier flags separated by "+" or "|" and enclosed
+       between "[" and "]".
+
+       The following flags are recognized:
+
+       enter
+	   The command is sent when the current frame timestamp enters the
+	   specified interval. In other words, the command is sent when the
+	   previous frame timestamp was not in the given interval, and the
+	   current is.
+
+       leave
+	   The command is sent when the current frame timestamp leaves the
+	   specified interval. In other words, the command is sent when the
+	   previous frame timestamp was in the given interval, and the current
+	   is not.
+
+       expr
+	   The command ARG is interpreted as expression and result of
+	   expression is passed as ARG.
+
+	   The expression is evaluated through the eval API and can contain
+	   the following constants:
+
+	   POS Original position in the file of the frame, or undefined if
+	       undefined for the current frame. Deprecated, do not use.
+
+	   PTS The presentation timestamp in input.
+
+	   N   The count of the input frame for video or audio, starting from
+	       0.
+
+	   T   The time in seconds of the current frame.
+
+	   TS  The start time in seconds of the current command interval.
+
+	   TE  The end time in seconds of the current command interval.
+
+	   TI  The interpolated time of the current command interval, TI = (T
+	       - TS) / (TE - TS).
+
+	   W   The video frame width.
+
+	   H   The video frame height.
+
+       If FLAGS is not specified, a default value of "[enter]" is assumed.
+
+       TARGET specifies the target of the command, usually the name of the
+       filter class or a specific filter instance name.
+
+       COMMAND specifies the name of the command for the target filter.
+
+       ARG is optional and specifies the optional list of argument for the
+       given COMMAND.
+
+       Between one interval specification and another, whitespaces, or
+       sequences of characters starting with "#" until the end of line, are
+       ignored and can be used to annotate comments.
+
+       A simplified BNF description of the commands specification syntax
+       follows:
+
+	       <COMMAND_FLAG>  ::= "enter" | "leave"
+	       <COMMAND_FLAGS> ::= <COMMAND_FLAG> [(+|"|")<COMMAND_FLAG>]
+	       <COMMAND>       ::= ["[" <COMMAND_FLAGS> "]"] <TARGET> <COMMAND> [<ARG>]
+	       <COMMANDS>      ::= <COMMAND> [,<COMMANDS>]
+	       <INTERVAL>      ::= <START>[-<END>] <COMMANDS>
+	       <INTERVALS>     ::= <INTERVAL>[;<INTERVALS>]
+
+       Examples
+
+       o   Specify audio tempo change at second 4:
+
+		   asendcmd=c='4.0 atempo tempo 1.5',atempo
+
+       o   Target a specific filter instance:
+
+		   asendcmd=c='4.0 atempo@my tempo 1.5',atempo@my
+
+       o   Specify a list of drawtext and hue commands in a file.
+
+		   # show text in the interval 5-10
+		   5.0-10.0 [enter] drawtext reinit 'fontfile=FreeSerif.ttf:text=hello world',
+			    [leave] drawtext reinit 'fontfile=FreeSerif.ttf:text=';
+
+		   # desaturate the image in the interval 15-20
+		   15.0-20.0 [enter] hue s 0,
+			     [enter] drawtext reinit 'fontfile=FreeSerif.ttf:text=nocolor',
+			     [leave] hue s 1,
+			     [leave] drawtext reinit 'fontfile=FreeSerif.ttf:text=color';
+
+		   # apply an exponential saturation fade-out effect, starting from time 25
+		   25 [enter] hue s exp(25-t)
+
+	   A filtergraph allowing to read and process the above command list
+	   stored in a file test.cmd, can be specified with:
+
+		   sendcmd=f=test.cmd,drawtext=fontfile=FreeSerif.ttf:text='',hue
+
+   setpts, asetpts
+       Change the PTS (presentation timestamp) of the input frames.
+
+       "setpts" works on video frames, "asetpts" on audio frames.
+
+       This filter accepts the following options:
+
+       expr
+	   The expression which is evaluated for each frame to construct its
+	   timestamp.
+
+       The expression is evaluated through the eval API and can contain the
+       following constants:
+
+       FRAME_RATE, FR
+	   frame rate, only defined for constant frame-rate video
+
+       PTS The presentation timestamp in input
+
+       N   The count of the input frame for video or the number of consumed
+	   samples, not including the current frame for audio, starting from
+	   0.
+
+       NB_CONSUMED_SAMPLES
+	   The number of consumed samples, not including the current frame
+	   (only audio)
+
+       NB_SAMPLES, S
+	   The number of samples in the current frame (only audio)
+
+       SAMPLE_RATE, SR
+	   The audio sample rate.
+
+       STARTPTS
+	   The PTS of the first frame.
+
+       STARTT
+	   the time in seconds of the first frame
+
+       INTERLACED
+	   State whether the current frame is interlaced.
+
+       T   the time in seconds of the current frame
+
+       POS original position in the file of the frame, or undefined if
+	   undefined for the current frame; deprecated, do not use
+
+       PREV_INPTS
+	   The previous input PTS.
+
+       PREV_INT
+	   previous input time in seconds
+
+       PREV_OUTPTS
+	   The previous output PTS.
+
+       PREV_OUTT
+	   previous output time in seconds
+
+       RTCTIME
+	   The wallclock (RTC) time in microseconds. This is deprecated, use
+	   time(0) instead.
+
+       RTCSTART
+	   The wallclock (RTC) time at the start of the movie in microseconds.
+
+       TB  The timebase of the input timestamps.
+
+       T_CHANGE
+	   Time of the first frame after command was applied or time of the
+	   first frame if no commands.
+
+       Examples
+
+       o   Start counting PTS from zero
+
+		   setpts=PTS-STARTPTS
+
+       o   Apply fast motion effect:
+
+		   setpts=0.5*PTS
+
+       o   Apply slow motion effect:
+
+		   setpts=2.0*PTS
+
+       o   Set fixed rate of 25 frames per second:
+
+		   setpts=N/(25*TB)
+
+       o   Apply a random jitter effect of +/-100 TB units:
+
+		   setpts=PTS+randomi(0, -100\,100)
+
+       o   Set fixed rate 25 fps with some jitter:
+
+		   setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
+
+       o   Apply an offset of 10 seconds to the input PTS:
+
+		   setpts=PTS+10/TB
+
+       o   Generate timestamps from a "live source" and rebase onto the
+	   current timebase:
+
+		   setpts='(RTCTIME - RTCSTART) / (TB * 1000000)'
+
+       o   Generate timestamps by counting samples:
+
+		   asetpts=N/SR/TB
+
+       Commands
+
+       Both filters support all above options as commands.
+
+   setrange
+       Force color range for the output video frame.
+
+       The "setrange" filter marks the color range property for the output
+       frames. It does not change the input frame, but only sets the
+       corresponding property, which affects how the frame is treated by
+       following filters.
+
+       The filter accepts the following options:
+
+       range
+	   Available values are:
+
+	   auto
+	       Keep the same color range property.
+
+	   unspecified, unknown
+	       Set the color range as unspecified.
+
+	   limited, tv, mpeg
+	       Set the color range as limited.
+
+	   full, pc, jpeg
+	       Set the color range as full.
+
+   settb, asettb
+       Set the timebase to use for the output frames timestamps.  It is mainly
+       useful for testing timebase configuration.
+
+       It accepts the following parameters:
+
+       expr, tb
+	   The expression which is evaluated into the output timebase.
+
+       The value for tb is an arithmetic expression representing a rational.
+       The expression can contain the constants "AVTB" (the default timebase),
+       "intb" (the input timebase) and "sr" (the sample rate, audio only).
+       Default value is "intb".
+
+       Examples
+
+       o   Set the timebase to 1/25:
+
+		   settb=expr=1/25
+
+       o   Set the timebase to 1/10:
+
+		   settb=expr=0.1
+
+       o   Set the timebase to 1001/1000:
+
+		   settb=1+0.001
+
+       o   Set the timebase to 2*intb:
+
+		   settb=2*intb
+
+       o   Set the default timebase value:
+
+		   settb=AVTB
+
+   showcqt
+       Convert input audio to a video output representing frequency spectrum
+       logarithmically using Brown-Puckette constant Q transform algorithm
+       with direct frequency domain coefficient calculation (but the transform
+       itself is not really constant Q, instead the Q factor is actually
+       variable/clamped), with musical tone scale, from E0 to D#10.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. It must be even. For the
+	   syntax of this option, check the "Video size" section in the
+	   ffmpeg-utils manual.  Default value is "1920x1080".
+
+       fps, rate, r
+	   Set the output frame rate. Default value is 25.
+
+       bar_h
+	   Set the bargraph height. It must be even. Default value is "-1"
+	   which computes the bargraph height automatically.
+
+       axis_h
+	   Set the axis height. It must be even. Default value is "-1" which
+	   computes the axis height automatically.
+
+       sono_h
+	   Set the sonogram height. It must be even. Default value is "-1"
+	   which computes the sonogram height automatically.
+
+       fullhd
+	   Set the fullhd resolution. This option is deprecated, use size, s
+	   instead. Default value is 1.
+
+       sono_v, volume
+	   Specify the sonogram volume expression. It can contain variables:
+
+	   bar_v
+	       the bar_v evaluated expression
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option
+
+	   and functions:
+
+	   a_weighting(f)
+	       A-weighting of equal loudness
+
+	   b_weighting(f)
+	       B-weighting of equal loudness
+
+	   c_weighting(f)
+	       C-weighting of equal loudness.
+
+	   Default value is 16.
+
+       bar_v, volume2
+	   Specify the bargraph volume expression. It can contain variables:
+
+	   sono_v
+	       the sono_v evaluated expression
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option
+
+	   and functions:
+
+	   a_weighting(f)
+	       A-weighting of equal loudness
+
+	   b_weighting(f)
+	       B-weighting of equal loudness
+
+	   c_weighting(f)
+	       C-weighting of equal loudness.
+
+	   Default value is "sono_v".
+
+       sono_g, gamma
+	   Specify the sonogram gamma. Lower gamma makes the spectrum more
+	   contrast, higher gamma makes the spectrum having more range.
+	   Default value is 3.	Acceptable range is "[1, 7]".
+
+       bar_g, gamma2
+	   Specify the bargraph gamma. Default value is 1. Acceptable range is
+	   "[1, 7]".
+
+       bar_t
+	   Specify the bargraph transparency level. Lower value makes the
+	   bargraph sharper.  Default value is 1. Acceptable range is "[0,
+	   1]".
+
+       timeclamp, tc
+	   Specify the transform timeclamp. At low frequency, there is trade-
+	   off between accuracy in time domain and frequency domain. If
+	   timeclamp is lower, event in time domain is represented more
+	   accurately (such as fast bass drum), otherwise event in frequency
+	   domain is represented more accurately (such as bass guitar).
+	   Acceptable range is "[0.002, 1]". Default value is 0.17.
+
+       attack
+	   Set attack time in seconds. The default is 0 (disabled). Otherwise,
+	   it limits future samples by applying asymmetric windowing in time
+	   domain, useful when low latency is required. Accepted range is "[0,
+	   1]".
+
+       basefreq
+	   Specify the transform base frequency. Default value is
+	   20.01523126408007475, which is frequency 50 cents below E0.
+	   Acceptable range is "[10, 100000]".
+
+       endfreq
+	   Specify the transform end frequency. Default value is
+	   20495.59681441799654, which is frequency 50 cents above D#10.
+	   Acceptable range is "[10, 100000]".
+
+       coeffclamp
+	   This option is deprecated and ignored.
+
+       tlength
+	   Specify the transform length in time domain. Use this option to
+	   control accuracy trade-off between time domain and frequency domain
+	   at every frequency sample.  It can contain variables:
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option.
+
+	   Default value is "384*tc/(384+tc*f)".
+
+       count
+	   Specify the transform count for every video frame. Default value is
+	   6.  Acceptable range is "[1, 30]".
+
+       fcount
+	   Specify the transform count for every single pixel. Default value
+	   is 0, which makes it computed automatically. Acceptable range is
+	   "[0, 10]".
+
+       fontfile
+	   Specify font file for use with freetype to draw the axis. If not
+	   specified, use embedded font. Note that drawing with font file or
+	   embedded font is not implemented with custom basefreq and endfreq,
+	   use axisfile option instead.
+
+       font
+	   Specify fontconfig pattern. This has lower priority than fontfile.
+	   The ":" in the pattern may be replaced by "|" to avoid unnecessary
+	   escaping.
+
+       fontcolor
+	   Specify font color expression. This is arithmetic expression that
+	   should return integer value 0xRRGGBB. It can contain variables:
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option
+
+	   and functions:
+
+	   midi(f)
+	       midi number of frequency f, some midi numbers: E0(16), C1(24),
+	       C2(36), A4(69)
+
+	   r(x), g(x), b(x)
+	       red, green, and blue value of intensity x.
+
+	   Default value is "st(0, (midi(f)-59.5)/12); st(1,
+	   if(between(ld(0),0,1), 0.5-0.5*cos(2*PI*ld(0)), 0)); r(1-ld(1)) +
+	   b(ld(1))".
+
+       axisfile
+	   Specify image file to draw the axis. This option override fontfile
+	   and fontcolor option.
+
+       axis, text
+	   Enable/disable drawing text to the axis. If it is set to 0, drawing
+	   to the axis is disabled, ignoring fontfile and axisfile option.
+	   Default value is 1.
+
+       csp Set colorspace. The accepted values are:
+
+	   unspecified
+	       Unspecified (default)
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt470bg
+	       BT.470BG or BT.601-6 625
+
+	   smpte170m
+	       SMPTE-170M or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   bt2020ncl
+	       BT.2020 with non-constant luminance
+
+       cscheme
+	   Set spectrogram color scheme. This is list of floating point values
+	   with format "left_r|left_g|left_b|right_r|right_g|right_b".	The
+	   default is "1|0.5|0|0|0.5|1".
+
+       Examples
+
+       o   Playing audio while showing the spectrum:
+
+		   ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt [out0]'
+
+       o   Same as above, but with frame rate 30 fps:
+
+		   ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=fps=30:count=5 [out0]'
+
+       o   Playing at 1280x720:
+
+		   ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=s=1280x720:count=4 [out0]'
+
+       o   Disable sonogram display:
+
+		   sono_h=0
+
+       o   A1 and its harmonics: A1, A2, (near)E3, A3:
+
+		   ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
+				    asplit[a][out1]; [a] showcqt [out0]'
+
+       o   Same as above, but with more accuracy in frequency domain:
+
+		   ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
+				    asplit[a][out1]; [a] showcqt=timeclamp=0.5 [out0]'
+
+       o   Custom volume:
+
+		   bar_v=10:sono_v=bar_v*a_weighting(f)
+
+       o   Custom gamma, now spectrum is linear to the amplitude.
+
+		   bar_g=2:sono_g=2
+
+       o   Custom tlength equation:
+
+		   tc=0.33:tlength='st(0,0.17); 384*tc / (384 / ld(0) + tc*f /(1-ld(0))) + 384*tc / (tc*f / ld(0) + 384 /(1-ld(0)))'
+
+       o   Custom fontcolor and fontfile, C-note is colored green, others are
+	   colored blue:
+
+		   fontcolor='if(mod(floor(midi(f)+0.5),12), 0x0000FF, g(1))':fontfile=myfont.ttf
+
+       o   Custom font using fontconfig:
+
+		   font='Courier New,Monospace,mono|bold'
+
+       o   Custom frequency range with custom axis using image file:
+
+		   axisfile=myaxis.png:basefreq=40:endfreq=10000
+
+   showcwt
+       Convert input audio to video output representing frequency spectrum
+       using Continuous Wavelet Transform and Morlet wavelet.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "640x512".
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+       scale
+	   Set the frequency scale used. Allowed values are:
+
+	   linear
+	   log
+	   bark
+	   mel
+	   erbs
+	   sqrt
+	   cbrt
+	   qdrt
+	   fm
+
+	   Default value is "linear".
+
+       iscale
+	   Set the intensity scale used. Allowed values are:
+
+	   linear
+	   log
+	   sqrt
+	   cbrt
+	   qdrt
+
+	   Default value is "log".
+
+       min Set the minimum frequency that will be used in output.  Default is
+	   20 Hz.
+
+       max Set the maximum frequency that will be used in output.  Default is
+	   20000 Hz. The real frequency upper limit depends on input audio's
+	   sample rate and such will be enforced on this value when it is set
+	   to value greater than Nyquist frequency.
+
+       imin
+	   Set the minimum intensity that will be used in output.
+
+       imax
+	   Set the maximum intensity that will be used in output.
+
+       logb
+	   Set the logarithmic basis for brightness strength when mapping
+	   calculated magnitude values to pixel values.  Allowed range is from
+	   0 to 1.  Default value is 0.0001.
+
+       deviation
+	   Set the frequency deviation.  Lower values than 1 are more
+	   frequency oriented, while higher values than 1 are more time
+	   oriented.  Allowed range is from 0 to 10.  Default value is 1.
+
+       pps Set the number of pixel output per each second in one row.  Allowed
+	   range is from 1 to 1024.  Default value is 64.
+
+       mode
+	   Set the output visual mode. Allowed values are:
+
+	   magnitude
+	       Show magnitude.
+
+	   phase
+	       Show only phase.
+
+	   magphase
+	       Show combination of magnitude and phase.  Magnitude is mapped
+	       to brightness and phase to color.
+
+	   channel
+	       Show unique color per channel magnitude.
+
+	   stereo
+	       Show unique color per stereo difference.
+
+	   Default value is "magnitude".
+
+       slide
+	   Set the output slide method. Allowed values are:
+
+	   replace
+	   scroll
+	   frame
+       direction
+	   Set the direction method for output slide method. Allowed values
+	   are:
+
+	   lr  Direction from left to right.
+
+	   rl  Direction from right to left.
+
+	   ud  Direction from up to down.
+
+	   du  Direction from down to up.
+
+       bar Set the ratio of bargraph display to display size. Default is 0.
+
+       rotation
+	   Set color rotation, must be in [-1.0, 1.0] range.  Default value is
+	   0.
+
+   showfreqs
+       Convert input audio to video output representing the audio power
+       spectrum.  Audio amplitude is on Y-axis while frequency is on X-axis.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify size of video. For the syntax of this option, check the
+	   "Video size" section in the ffmpeg-utils manual.  Default is
+	   "1024x512".
+
+       rate, r
+	   Set video rate. Default is 25.
+
+       mode
+	   Set display mode.  This set how each frequency bin will be
+	   represented.
+
+	   It accepts the following values:
+
+	   line
+	   bar
+	   dot
+
+	   Default is "bar".
+
+       ascale
+	   Set amplitude scale.
+
+	   It accepts the following values:
+
+	   lin Linear scale.
+
+	   sqrt
+	       Square root scale.
+
+	   cbrt
+	       Cubic root scale.
+
+	   log Logarithmic scale.
+
+	   Default is "log".
+
+       fscale
+	   Set frequency scale.
+
+	   It accepts the following values:
+
+	   lin Linear scale.
+
+	   log Logarithmic scale.
+
+	   rlog
+	       Reverse logarithmic scale.
+
+	   Default is "lin".
+
+       win_size
+	   Set window size. Allowed range is from 16 to 65536.
+
+	   Default is 2048
+
+       win_func
+	   Set windowing function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hanning".
+
+       overlap
+	   Set window overlap. In range "[0, 1]". Default is 1, which means
+	   optimal overlap for selected window function will be picked.
+
+       averaging
+	   Set time averaging. Setting this to 0 will display current maximal
+	   peaks.  Default is 1, which means time averaging is disabled.
+
+       colors
+	   Specify list of colors separated by space or by '|' which will be
+	   used to draw channel frequencies. Unrecognized or missing colors
+	   will be replaced by white color.
+
+       cmode
+	   Set channel display mode.
+
+	   It accepts the following values:
+
+	   combined
+	   separate
+
+	   Default is "combined".
+
+       minamp
+	   Set minimum amplitude used in "log" amplitude scaler.
+
+       data
+	   Set data display mode.
+
+	   It accepts the following values:
+
+	   magnitude
+	   phase
+	   delay
+
+	   Default is "magnitude".
+
+       channels
+	   Set channels to use when processing audio. By default all are
+	   processed.
+
+   showspatial
+       Convert stereo input audio to a video output, representing the spatial
+       relationship between two channels.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "512x512".
+
+       win_size
+	   Set window size. Allowed range is from 1024 to 65536. Default size
+	   is 4096.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default value is "hann".
+
+       rate, r
+	   Set output framerate.
+
+   showspectrum
+       Convert input audio to a video output, representing the audio frequency
+       spectrum.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "640x512".
+
+       slide
+	   Specify how the spectrum should slide along the window.
+
+	   It accepts the following values:
+
+	   replace
+	       the samples start again on the left when they reach the right
+
+	   scroll
+	       the samples scroll from right to left
+
+	   fullframe
+	       frames are only produced when the samples reach the right
+
+	   rscroll
+	       the samples scroll from left to right
+
+	   lreplace
+	       the samples start again on the right when they reach the left
+
+	   Default value is "replace".
+
+       mode
+	   Specify display mode.
+
+	   It accepts the following values:
+
+	   combined
+	       all channels are displayed in the same row
+
+	   separate
+	       all channels are displayed in separate rows
+
+	   Default value is combined.
+
+       color
+	   Specify display color mode.
+
+	   It accepts the following values:
+
+	   channel
+	       each channel is displayed in a separate color
+
+	   intensity
+	       each channel is displayed using the same color scheme
+
+	   rainbow
+	       each channel is displayed using the rainbow color scheme
+
+	   moreland
+	       each channel is displayed using the moreland color scheme
+
+	   nebulae
+	       each channel is displayed using the nebulae color scheme
+
+	   fire
+	       each channel is displayed using the fire color scheme
+
+	   fiery
+	       each channel is displayed using the fiery color scheme
+
+	   fruit
+	       each channel is displayed using the fruit color scheme
+
+	   cool
+	       each channel is displayed using the cool color scheme
+
+	   magma
+	       each channel is displayed using the magma color scheme
+
+	   green
+	       each channel is displayed using the green color scheme
+
+	   viridis
+	       each channel is displayed using the viridis color scheme
+
+	   plasma
+	       each channel is displayed using the plasma color scheme
+
+	   cividis
+	       each channel is displayed using the cividis color scheme
+
+	   terrain
+	       each channel is displayed using the terrain color scheme
+
+	   Default value is channel.
+
+       scale
+	   Specify scale used for calculating intensity color values.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   sqrt
+	       square root, default
+
+	   cbrt
+	       cubic root
+
+	   log logarithmic
+
+	   4thrt
+	       4th root
+
+	   5thrt
+	       5th root
+
+	   Default value is sqrt.
+
+       fscale
+	   Specify frequency scale.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   log logarithmic
+
+	   Default value is lin.
+
+       saturation
+	   Set saturation modifier for displayed colors. Negative values
+	   provide alternative color scheme. 0 is no saturation at all.
+	   Saturation must be in [-10.0, 10.0] range.  Default value is 1.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default value is "hann".
+
+       orientation
+	   Set orientation of time vs frequency axis. Can be "vertical" or
+	   "horizontal". Default is "vertical".
+
+       overlap
+	   Set ratio of overlap window. Default value is 0.  When value is 1
+	   overlap is set to recommended size for specific window function
+	   currently used.
+
+       gain
+	   Set scale gain for calculating intensity color values.  Default
+	   value is 1.
+
+       data
+	   Set which data to display. Can be "magnitude", default or "phase",
+	   or unwrapped phase: "uphase".
+
+       rotation
+	   Set color rotation, must be in [-1.0, 1.0] range.  Default value is
+	   0.
+
+       start
+	   Set start frequency from which to display spectrogram. Default is
+	   0.
+
+       stop
+	   Set stop frequency to which to display spectrogram. Default is 0.
+
+       fps Set upper frame rate limit. Default is "auto", unlimited.
+
+       legend
+	   Draw time and frequency axes and legends. Default is disabled.
+
+       drange
+	   Set dynamic range used to calculate intensity color values. Default
+	   is 120 dBFS.  Allowed range is from 10 to 200.
+
+       limit
+	   Set upper limit of input audio samples volume in dBFS. Default is 0
+	   dBFS.  Allowed range is from -100 to 100.
+
+       opacity
+	   Set opacity strength when using pixel format output with alpha
+	   component.
+
+       The usage is very similar to the showwaves filter; see the examples in
+       that section.
+
+       Examples
+
+       o   Large window with logarithmic color scaling:
+
+		   showspectrum=s=1280x480:scale=log
+
+       o   Complete example for a colored and sliding spectrum per channel
+	   using ffplay:
+
+		   ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1];
+				[a] showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt [out0]'
+
+   showspectrumpic
+       Convert input audio to a single video frame, representing the audio
+       frequency spectrum.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "4096x2048".
+
+       mode
+	   Specify display mode.
+
+	   It accepts the following values:
+
+	   combined
+	       all channels are displayed in the same row
+
+	   separate
+	       all channels are displayed in separate rows
+
+	   Default value is combined.
+
+       color
+	   Specify display color mode.
+
+	   It accepts the following values:
+
+	   channel
+	       each channel is displayed in a separate color
+
+	   intensity
+	       each channel is displayed using the same color scheme
+
+	   rainbow
+	       each channel is displayed using the rainbow color scheme
+
+	   moreland
+	       each channel is displayed using the moreland color scheme
+
+	   nebulae
+	       each channel is displayed using the nebulae color scheme
+
+	   fire
+	       each channel is displayed using the fire color scheme
+
+	   fiery
+	       each channel is displayed using the fiery color scheme
+
+	   fruit
+	       each channel is displayed using the fruit color scheme
+
+	   cool
+	       each channel is displayed using the cool color scheme
+
+	   magma
+	       each channel is displayed using the magma color scheme
+
+	   green
+	       each channel is displayed using the green color scheme
+
+	   viridis
+	       each channel is displayed using the viridis color scheme
+
+	   plasma
+	       each channel is displayed using the plasma color scheme
+
+	   cividis
+	       each channel is displayed using the cividis color scheme
+
+	   terrain
+	       each channel is displayed using the terrain color scheme
+
+	   Default value is intensity.
+
+       scale
+	   Specify scale used for calculating intensity color values.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   sqrt
+	       square root, default
+
+	   cbrt
+	       cubic root
+
+	   log logarithmic
+
+	   4thrt
+	       4th root
+
+	   5thrt
+	       5th root
+
+	   Default value is log.
+
+       fscale
+	   Specify frequency scale.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   log logarithmic
+
+	   Default value is lin.
+
+       saturation
+	   Set saturation modifier for displayed colors. Negative values
+	   provide alternative color scheme. 0 is no saturation at all.
+	   Saturation must be in [-10.0, 10.0] range.  Default value is 1.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default value is "hann".
+
+       orientation
+	   Set orientation of time vs frequency axis. Can be "vertical" or
+	   "horizontal". Default is "vertical".
+
+       gain
+	   Set scale gain for calculating intensity color values.  Default
+	   value is 1.
+
+       legend
+	   Draw time and frequency axes and legends. Default is enabled.
+
+       rotation
+	   Set color rotation, must be in [-1.0, 1.0] range.  Default value is
+	   0.
+
+       start
+	   Set start frequency from which to display spectrogram. Default is
+	   0.
+
+       stop
+	   Set stop frequency to which to display spectrogram. Default is 0.
+
+       drange
+	   Set dynamic range used to calculate intensity color values. Default
+	   is 120 dBFS.  Allowed range is from 10 to 200.
+
+       limit
+	   Set upper limit of input audio samples volume in dBFS. Default is 0
+	   dBFS.  Allowed range is from -100 to 100.
+
+       opacity
+	   Set opacity strength when using pixel format output with alpha
+	   component.
+
+       Examples
+
+       o   Extract an audio spectrogram of a whole audio track in a 1024x1024
+	   picture using ffmpeg:
+
+		   ffmpeg -i audio.flac -lavfi showspectrumpic=s=1024x1024 spectrogram.png
+
+   showvolume
+       Convert input audio volume to a video output.
+
+       The filter accepts the following options:
+
+       rate, r
+	   Set video rate.
+
+       b   Set border width, allowed range is [0, 5]. Default is 1.
+
+       w   Set channel width, allowed range is [80, 8192]. Default is 400.
+
+       h   Set channel height, allowed range is [1, 900]. Default is 20.
+
+       f   Set fade, allowed range is [0, 1]. Default is 0.95.
+
+       c   Set volume color expression.
+
+	   The expression can use the following variables:
+
+	   VOLUME
+	       Current max volume of channel in dB.
+
+	   PEAK
+	       Current peak.
+
+	   CHANNEL
+	       Current channel number, starting from 0.
+
+       t   If set, displays channel names. Default is enabled.
+
+       v   If set, displays volume values. Default is enabled.
+
+       o   Set orientation, can be horizontal: "h" or vertical: "v", default
+	   is "h".
+
+       s   Set step size, allowed range is [0, 5]. Default is 0, which means
+	   step is disabled.
+
+       p   Set background opacity, allowed range is [0, 1]. Default is 0.
+
+       m   Set metering mode, can be peak: "p" or rms: "r", default is "p".
+
+       ds  Set display scale, can be linear: "lin" or log: "log", default is
+	   "lin".
+
+       dm  In second.  If set to > 0., display a line for the max level in the
+	   previous seconds.  default is disabled: 0.
+
+       dmc The color of the max line. Use when "dm" option is set to > 0.
+	   default is: "orange"
+
+   showwaves
+       Convert input audio to a video output, representing the samples waves.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "600x240".
+
+       mode
+	   Set display mode.
+
+	   Available values are:
+
+	   point
+	       Draw a point for each sample.
+
+	   line
+	       Draw a vertical line for each sample.
+
+	   p2p Draw a point for each sample and a line between them.
+
+	   cline
+	       Draw a centered vertical line for each sample.
+
+	   Default value is "point".
+
+       n   Set the number of samples which are printed on the same column. A
+	   larger value will decrease the frame rate. Must be a positive
+	   integer. This option can be set only if the value for rate is not
+	   explicitly specified.
+
+       rate, r
+	   Set the (approximate) output frame rate. This is done by setting
+	   the option n. Default value is "25".
+
+       split_channels
+	   Set if channels should be drawn separately or overlap. Default
+	   value is 0.
+
+       colors
+	   Set colors separated by '|' which are going to be used for drawing
+	   of each channel.
+
+       scale
+	   Set amplitude scale.
+
+	   Available values are:
+
+	   lin Linear.
+
+	   log Logarithmic.
+
+	   sqrt
+	       Square root.
+
+	   cbrt
+	       Cubic root.
+
+	   Default is linear.
+
+       draw
+	   Set the draw mode. This is mostly useful to set for high n.
+
+	   Available values are:
+
+	   scale
+	       Scale pixel values for each drawn sample.
+
+	   full
+	       Draw every sample directly.
+
+	   Default value is "scale".
+
+       Examples
+
+       o   Output the input file audio and the corresponding video
+	   representation at the same time:
+
+		   amovie=a.mp3,asplit[out0],showwaves[out1]
+
+       o   Create a synthetic signal and show it with showwaves, forcing a
+	   frame rate of 30 frames per second:
+
+		   aevalsrc=sin(1*2*PI*t)*sin(880*2*PI*t):cos(2*PI*200*t),asplit[out0],showwaves=r=30[out1]
+
+   showwavespic
+       Convert input audio to a single video frame, representing the samples
+       waves.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "600x240".
+
+       split_channels
+	   Set if channels should be drawn separately or overlap. Default
+	   value is 0.
+
+       colors
+	   Set colors separated by '|' which are going to be used for drawing
+	   of each channel.
+
+       scale
+	   Set amplitude scale.
+
+	   Available values are:
+
+	   lin Linear.
+
+	   log Logarithmic.
+
+	   sqrt
+	       Square root.
+
+	   cbrt
+	       Cubic root.
+
+	   Default is linear.
+
+       draw
+	   Set the draw mode.
+
+	   Available values are:
+
+	   scale
+	       Scale pixel values for each drawn sample.
+
+	   full
+	       Draw every sample directly.
+
+	   Default value is "scale".
+
+       filter
+	   Set the filter mode.
+
+	   Available values are:
+
+	   average
+	       Use average samples values for each drawn sample.
+
+	   peak
+	       Use peak samples values for each drawn sample.
+
+	   Default value is "average".
+
+       Examples
+
+       o   Extract a channel split representation of the wave form of a whole
+	   audio track in a 1024x800 picture using ffmpeg:
+
+		   ffmpeg -i audio.flac -lavfi showwavespic=split_channels=1:s=1024x800 waveform.png
+
+   sidedata, asidedata
+       Delete frame side data, or select frames based on it.
+
+       This filter accepts the following options:
+
+       mode
+	   Set mode of operation of the filter.
+
+	   Can be one of the following:
+
+	   select
+	       Select every frame with side data of "type".
+
+	   delete
+	       Delete side data of "type". If "type" is not set, delete all
+	       side data in the frame.
+
+       type
+	   Set side data type used with all modes. Must be set for "select"
+	   mode. For the list of frame side data types, refer to the
+	   "AVFrameSideDataType" enum in libavutil/frame.h. For example, to
+	   choose "AV_FRAME_DATA_PANSCAN" side data, you must specify
+	   "PANSCAN".
+
+   spectrumsynth
+       Synthesize audio from 2 input video spectrums, first input stream
+       represents magnitude across time and second represents phase across
+       time.  The filter will transform from frequency domain as displayed in
+       videos back to time domain as presented in audio output.
+
+       This filter is primarily created for reversing processed showspectrum
+       filter outputs, but can synthesize sound from other spectrograms too.
+       But in such case results are going to be poor if the phase data is not
+       available, because in such cases phase data need to be recreated,
+       usually it's just recreated from random noise.  For best results use
+       gray only output ("channel" color mode in showspectrum filter) and
+       "log" scale for magnitude video and "lin" scale for phase video. To
+       produce phase, for 2nd video, use "data" option. Inputs videos should
+       generally use "fullframe" slide mode as that saves resources needed for
+       decoding video.
+
+       The filter accepts the following options:
+
+       sample_rate
+	   Specify sample rate of output audio, the sample rate of audio from
+	   which spectrum was generated may differ.
+
+       channels
+	   Set number of channels represented in input video spectrums.
+
+       scale
+	   Set scale which was used when generating magnitude input spectrum.
+	   Can be "lin" or "log". Default is "log".
+
+       slide
+	   Set slide which was used when generating inputs spectrums.  Can be
+	   "replace", "scroll", "fullframe" or "rscroll".  Default is
+	   "fullframe".
+
+       win_func
+	   Set window function used for resynthesis.
+
+       overlap
+	   Set window overlap. In range "[0, 1]". Default is 1, which means
+	   optimal overlap for selected window function will be picked.
+
+       orientation
+	   Set orientation of input videos. Can be "vertical" or "horizontal".
+	   Default is "vertical".
+
+       Examples
+
+       o   First create magnitude and phase videos from audio, assuming audio
+	   is stereo with 44100 sample rate, then resynthesize videos back to
+	   audio with spectrumsynth:
+
+		   ffmpeg -i input.flac -lavfi showspectrum=mode=separate:scale=log:overlap=0.875:color=channel:slide=fullframe:data=magnitude -an -c:v rawvideo magnitude.nut
+		   ffmpeg -i input.flac -lavfi showspectrum=mode=separate:scale=lin:overlap=0.875:color=channel:slide=fullframe:data=phase -an -c:v rawvideo phase.nut
+		   ffmpeg -i magnitude.nut -i phase.nut -lavfi spectrumsynth=channels=2:sample_rate=44100:win_func=hann:overlap=0.875:slide=fullframe output.flac
+
+   split, asplit
+       Split input into several identical outputs.
+
+       "asplit" works with audio input, "split" with video.
+
+       The filter accepts a single parameter which specifies the number of
+       outputs. If unspecified, it defaults to 2.
+
+       Examples
+
+       o   Create two separate outputs from the same input:
+
+		   [in] split [out0][out1]
+
+       o   To create 3 or more outputs, you need to specify the number of
+	   outputs, like in:
+
+		   [in] asplit=3 [out0][out1][out2]
+
+       o   Create two separate outputs from the same input, one cropped and
+	   one padded:
+
+		   [in] split [splitout1][splitout2];
+		   [splitout1] crop=100:100:0:0    [cropout];
+		   [splitout2] pad=200:200:100:100 [padout];
+
+       o   Create 5 copies of the input audio with ffmpeg:
+
+		   ffmpeg -i INPUT -filter_complex asplit=5 OUTPUT
+
+   zmq, azmq
+       Receive commands sent through a libzmq client, and forward them to
+       filters in the filtergraph.
+
+       "zmq" and "azmq" work as a pass-through filters. "zmq" must be inserted
+       between two video filters, "azmq" between two audio filters. Both are
+       capable to send messages to any filter type.
+
+       To enable these filters you need to install the libzmq library and
+       headers and configure FFmpeg with "--enable-libzmq".
+
+       For more information about libzmq see: <http://www.zeromq.org/>
+
+       The "zmq" and "azmq" filters work as a libzmq server, which receives
+       messages sent through a network interface defined by the bind_address
+       (or the abbreviation "b") option.  Default value of this option is
+       tcp://localhost:5555. You may want to alter this value to your needs,
+       but do not forget to escape any ':' signs (see filtergraph escaping).
+
+       The received message must be in the form:
+
+	       <TARGET> <COMMAND> [<ARG>]
+
+       TARGET specifies the target of the command, usually the name of the
+       filter class or a specific filter instance name. The default filter
+       instance name uses the pattern Parsed_<filter_name>_<index>, but you
+       can override this by using the filter_name@id syntax (see Filtergraph
+       syntax).
+
+       COMMAND specifies the name of the command for the target filter.
+
+       ARG is optional and specifies the optional argument list for the given
+       COMMAND.
+
+       Upon reception, the message is processed and the corresponding command
+       is injected into the filtergraph. Depending on the result, the filter
+       will send a reply to the client, adopting the format:
+
+	       <ERROR_CODE> <ERROR_REASON>
+	       <MESSAGE>
+
+       MESSAGE is optional.
+
+       Examples
+
+       Look at tools/zmqsend for an example of a zmq client which can be used
+       to send commands processed by these filters.
+
+       Consider the following filtergraph generated by ffplay.	In this
+       example the last overlay filter has an instance name. All other filters
+       will have default instance names.
+
+	       ffplay -dumpgraph 1 -f lavfi "
+	       color=s=100x100:c=red  [l];
+	       color=s=100x100:c=blue [r];
+	       nullsrc=s=200x100, zmq [bg];
+	       [bg][l]	 overlay     [bg+l];
+	       [bg+l][r] overlay@my=x=100 "
+
+       To change the color of the left side of the video, the following
+       command can be used:
+
+	       echo Parsed_color_0 c yellow | tools/zmqsend
+
+       To change the right side:
+
+	       echo Parsed_color_1 c pink | tools/zmqsend
+
+       To change the position of the right side:
+
+	       echo overlay@my x 150 | tools/zmqsend
+
+MULTIMEDIA SOURCES
+       Below is a description of the currently available multimedia sources.
+
+   amovie
+       This is the same as movie source, except it selects an audio stream by
+       default.
+
+   avsynctest
+       Generate an Audio/Video Sync Test.
+
+       Generated stream periodically shows flash video frame and emits beep in
+       audio.  Useful to inspect A/V sync issues.
+
+       It accepts the following options:
+
+       size, s
+	   Set output video size. Default value is "hd720".
+
+       framerate, fr
+	   Set output video frame rate. Default value is 30.
+
+       samplerate, sr
+	   Set output audio sample rate. Default value is 44100.
+
+       amplitude, a
+	   Set output audio beep amplitude. Default value is 0.7.
+
+       period, p
+	   Set output audio beep period in seconds. Default value is 3.
+
+       delay, dl
+	   Set output video flash delay in number of frames. Default value is
+	   0.
+
+       cycle, c
+	   Enable cycling of video delays, by default is disabled.
+
+       duration, d
+	   Set stream output duration. By default duration is unlimited.
+
+       fg, bg, ag
+	   Set foreground/background/additional color.
+
+       Commands
+
+       This source supports the some above options as commands.
+
+   movie
+       Read audio and/or video stream(s) from a movie container.
+
+       It accepts the following parameters:
+
+       filename
+	   The name of the resource to read (not necessarily a file; it can
+	   also be a device or a stream accessed through some protocol).
+
+       format_name, f
+	   Specifies the format assumed for the movie to read, and can be
+	   either the name of a container or an input device. If not
+	   specified, the format is guessed from movie_name or by probing.
+
+       seek_point, sp
+	   Specifies the seek point in seconds. The frames will be output
+	   starting from this seek point. The parameter is evaluated with
+	   "av_strtod", so the numerical value may be suffixed by an IS
+	   postfix. The default value is "0".
+
+       streams, s
+	   Specifies the streams to read. Several streams can be specified,
+	   separated by "+". The source will then have as many outputs, in the
+	   same order. The syntax is explained in the "Stream specifiers"
+	   section in the ffmpeg manual. Two special names, "dv" and "da"
+	   specify respectively the default (best suited) video and audio
+	   stream. Default is "dv", or "da" if the filter is called as
+	   "amovie".
+
+       stream_index, si
+	   Specifies the index of the video stream to read. If the value is
+	   -1, the most suitable video stream will be automatically selected.
+	   The default value is "-1". Deprecated. If the filter is called
+	   "amovie", it will select audio instead of video.
+
+       loop
+	   Specifies how many times to read the stream in sequence.  If the
+	   value is 0, the stream will be looped infinitely.  Default value is
+	   "1".
+
+	   Note that when the movie is looped the source timestamps are not
+	   changed, so it will generate non monotonically increasing
+	   timestamps.
+
+       discontinuity
+	   Specifies the time difference between frames above which the point
+	   is considered a timestamp discontinuity which is removed by
+	   adjusting the later timestamps.
+
+       dec_threads
+	   Specifies the number of threads for decoding
+
+       format_opts
+	   Specify format options for the opened file. Format options can be
+	   specified as a list of key=value pairs separated by ':'. The
+	   following example shows how to add protocol_whitelist and
+	   protocol_blacklist options:
+
+		   ffplay -f lavfi
+		   "movie=filename='1.sdp':format_opts='protocol_whitelist=file,rtp,udp\:protocol_blacklist=http'"
+
+       It allows overlaying a second video on top of the main input of a
+       filtergraph, as shown in this graph:
+
+	       input -----------> deltapts0 --> overlay --> output
+						   ^
+						   |
+	       movie --> scale--> deltapts1 -------+
+
+       Examples
+
+       o   Skip 3.2 seconds from the start of the AVI file in.avi, and overlay
+	   it on top of the input labelled "in":
+
+		   movie=in.avi:seek_point=3.2, scale=180:-1, setpts=PTS-STARTPTS [over];
+		   [in] setpts=PTS-STARTPTS [main];
+		   [main][over] overlay=16:16 [out]
+
+       o   Read from a video4linux2 device, and overlay it on top of the input
+	   labelled "in":
+
+		   movie=/dev/video0:f=video4linux2, scale=180:-1, setpts=PTS-STARTPTS [over];
+		   [in] setpts=PTS-STARTPTS [main];
+		   [main][over] overlay=16:16 [out]
+
+       o   Read the first video stream and the audio stream with id 0x81 from
+	   dvd.vob; the video is connected to the pad named "video" and the
+	   audio is connected to the pad named "audio":
+
+		   movie=dvd.vob:s=v:0+#0x81 [video] [audio]
+
+       Commands
+
+       Both movie and amovie support the following commands:
+
+       seek
+	   Perform seek using "av_seek_frame".	The syntax is: seek
+	   stream_index|timestamp|flags
+
+	   o   stream_index: If stream_index is -1, a default stream is
+	       selected, and timestamp is automatically converted from
+	       AV_TIME_BASE units to the stream specific time_base.
+
+	   o   timestamp: Timestamp in AVStream.time_base units or, if no
+	       stream is specified, in AV_TIME_BASE units.
+
+	   o   flags: Flags which select direction and seeking mode.
+
+       get_duration
+	   Get movie duration in AV_TIME_BASE units.
+
+EXTERNAL LIBRARIES
+       FFmpeg can be hooked up with a number of external libraries to add
+       support for more formats. None of them are used by default, their use
+       has to be explicitly requested by passing the appropriate flags to
+       ./configure.
+
+   Alliance for Open Media (AOM)
+       FFmpeg can make use of the AOM library for AV1 decoding and encoding.
+
+       Go to <http://aomedia.org/> and follow the instructions for installing
+       the library. Then pass "--enable-libaom" to configure to enable it.
+
+   AMD AMF/VCE
+       FFmpeg can use the AMD Advanced Media Framework library for accelerated
+       H.264 and HEVC(only windows) encoding on hardware with Video Coding
+       Engine (VCE).
+
+       To enable support you must obtain the AMF framework header
+       files(version 1.4.9+) from
+       <https://github.com/GPUOpen-LibrariesAndSDKs/AMF.git>.
+
+       Create an "AMF/" directory in the system include path.  Copy the
+       contents of "AMF/amf/public/include/" into that directory.  Then
+       configure FFmpeg with "--enable-amf".
+
+       Initialization of amf encoder occurs in this order: 1) trying to
+       initialize through dx11(only windows) 2) trying to initialize through
+       dx9(only windows) 3) trying to initialize through vulkan
+
+       To use h.264(AMD VCE) encoder on linux amdgru-pro version 19.20+ and
+       amf-amdgpu-pro package(amdgru-pro contains, but does not install
+       automatically) are required.
+
+       This driver can be installed using amdgpu-pro-install script in
+       official amd driver archive.
+
+   AviSynth
+       FFmpeg can read AviSynth scripts as input. To enable support, pass
+       "--enable-avisynth" to configure after installing the headers provided
+       by <https://github.com/AviSynth/AviSynthPlus>.  AviSynth+ can be
+       configured to install only the headers by either passing
+       "-DHEADERS_ONLY:bool=on" to the normal CMake-based build system, or by
+       using the supplied "GNUmakefile".
+
+       For Windows, supported AviSynth variants are <http://avisynth.nl> for
+       32-bit builds and <http://avisynth.nl/index.php/AviSynth+> for 32-bit
+       and 64-bit builds.
+
+       For Linux, macOS, and BSD, the only supported AviSynth variant is
+       <https://github.com/AviSynth/AviSynthPlus>, starting with version 3.5.
+
+	   In 2016, AviSynth+ added support for building with GCC. However,
+	   due to the eccentricities of Windows' calling conventions, 32-bit
+	   GCC builds of AviSynth+ are not compatible with typical 32-bit
+	   builds of FFmpeg.
+
+	   By default, FFmpeg assumes compatibility with 32-bit MSVC builds of
+	   AviSynth+ since that is the most widely-used and entrenched build
+	   configuration.  Users can override this and enable support for
+	   32-bit GCC builds of AviSynth+ by passing "-DAVSC_WIN32_GCC32" to
+	   "--extra-cflags" when configuring FFmpeg.
+
+	   64-bit builds of FFmpeg are not affected, and can use either MSVC
+	   or GCC builds of AviSynth+ without any special flags.
+
+	   AviSynth(+) is loaded dynamically.  Distributors can build FFmpeg
+	   with "--enable-avisynth", and the binaries will work regardless of
+	   the end user having AviSynth installed.  If/when an end user would
+	   like to use AviSynth scripts, then they can install AviSynth(+) and
+	   FFmpeg will be able to find and use it to open scripts.
+
+   Chromaprint
+       FFmpeg can make use of the Chromaprint library for generating audio
+       fingerprints.  Pass "--enable-chromaprint" to configure to enable it.
+       See <https://acoustid.org/chromaprint>.
+
+   codec2
+       FFmpeg can make use of the codec2 library for codec2 decoding and
+       encoding.  There is currently no native decoder, so libcodec2 must be
+       used for decoding.
+
+       Go to <http://freedv.org/>, download "Codec 2 source archive".  Build
+       and install using CMake. Debian users can install the libcodec2-dev
+       package instead.  Once libcodec2 is installed you can pass
+       "--enable-libcodec2" to configure to enable it.
+
+       The easiest way to use codec2 is with .c2 files, since they contain the
+       mode information required for decoding.	To encode such a file, use a
+       .c2 file extension and give the libcodec2 encoder the -mode option:
+       "ffmpeg -i input.wav -mode 700C output.c2".  Playback is as simple as
+       "ffplay output.c2".  For a list of supported modes, run "ffmpeg -h
+       encoder=libcodec2".  Raw codec2 files are also supported.  To make
+       sense of them the mode in use needs to be specified as a format option:
+       "ffmpeg -f codec2raw -mode 1300 -i input.raw output.wav".
+
+   dav1d
+       FFmpeg can make use of the dav1d library for AV1 video decoding.
+
+       Go to <https://code.videolan.org/videolan/dav1d> and follow the
+       instructions for installing the library. Then pass "--enable-libdav1d"
+       to configure to enable it.
+
+   davs2
+       FFmpeg can make use of the davs2 library for AVS2-P2/IEEE1857.4 video
+       decoding.
+
+       Go to <https://github.com/pkuvcl/davs2> and follow the instructions for
+       installing the library. Then pass "--enable-libdavs2" to configure to
+       enable it.
+
+	   libdavs2 is under the GNU Public License Version 2 or later (see
+	   <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html> for
+	   details), you must upgrade FFmpeg's license to GPL in order to use
+	   it.
+
+   uavs3d
+       FFmpeg can make use of the uavs3d library for AVS3-P2/IEEE1857.10 video
+       decoding.
+
+       Go to <https://github.com/uavs3/uavs3d> and follow the instructions for
+       installing the library. Then pass "--enable-libuavs3d" to configure to
+       enable it.
+
+   Game Music Emu
+       FFmpeg can make use of the Game Music Emu library to read audio from
+       supported video game music file formats. Pass "--enable-libgme" to
+       configure to enable it. See
+       <https://bitbucket.org/mpyne/game-music-emu/overview>.
+
+   Intel QuickSync Video
+       FFmpeg can use Intel QuickSync Video (QSV) for accelerated decoding and
+       encoding of multiple codecs. To use QSV, FFmpeg must be linked against
+       the "libmfx" dispatcher, which loads the actual decoding libraries.
+
+       The dispatcher is open source and can be downloaded from
+       <https://github.com/lu-zero/mfx_dispatch.git>. FFmpeg needs to be
+       configured with the "--enable-libmfx" option and "pkg-config" needs to
+       be able to locate the dispatcher's ".pc" files.
+
+   Kvazaar
+       FFmpeg can make use of the Kvazaar library for HEVC encoding.
+
+       Go to <https://github.com/ultravideo/kvazaar> and follow the
+       instructions for installing the library. Then pass
+       "--enable-libkvazaar" to configure to enable it.
+
+   LAME
+       FFmpeg can make use of the LAME library for MP3 encoding.
+
+       Go to <http://lame.sourceforge.net/> and follow the instructions for
+       installing the library.	Then pass "--enable-libmp3lame" to configure
+       to enable it.
+
+   libilbc
+       iLBC is a narrowband speech codec that has been made freely available
+       by Google as part of the WebRTC project. libilbc is a packaging
+       friendly copy of the iLBC codec. FFmpeg can make use of the libilbc
+       library for iLBC decoding and encoding.
+
+       Go to <https://github.com/TimothyGu/libilbc> and follow the
+       instructions for installing the library. Then pass "--enable-libilbc"
+       to configure to enable it.
+
+   libjxl
+       JPEG XL is an image format intended to fully replace legacy JPEG for an
+       extended period of life. See <https://jpegxl.info/> for more
+       information, and see <https://github.com/libjxl/libjxl> for the library
+       source. You can pass "--enable-libjxl" to configure in order enable the
+       libjxl wrapper.
+
+   libvpx
+       FFmpeg can make use of the libvpx library for VP8/VP9 decoding and
+       encoding.
+
+       Go to <http://www.webmproject.org/> and follow the instructions for
+       installing the library. Then pass "--enable-libvpx" to configure to
+       enable it.
+
+   ModPlug
+       FFmpeg can make use of this library, originating in Modplug-XMMS, to
+       read from MOD-like music files.	See
+       <https://github.com/Konstanty/libmodplug>. Pass "--enable-libmodplug"
+       to configure to enable it.
+
+   OpenCORE, VisualOn, and Fraunhofer libraries
+       Spun off Google Android sources, OpenCore, VisualOn and Fraunhofer
+       libraries provide encoders for a number of audio codecs.
+
+	   OpenCORE and VisualOn libraries are under the Apache License 2.0
+	   (see <http://www.apache.org/licenses/LICENSE-2.0> for details),
+	   which is incompatible to the LGPL version 2.1 and GPL version 2.
+	   You have to upgrade FFmpeg's license to LGPL version 3 (or if you
+	   have enabled GPL components, GPL version 3) by passing
+	   "--enable-version3" to configure in order to use it.
+
+	   The license of the Fraunhofer AAC library is incompatible with the
+	   GPL.  Therefore, for GPL builds, you have to pass
+	   "--enable-nonfree" to configure in order to use it. To the best of
+	   our knowledge, it is compatible with the LGPL.
+
+       OpenCORE AMR
+
+       FFmpeg can make use of the OpenCORE libraries for AMR-NB
+       decoding/encoding and AMR-WB decoding.
+
+       Go to <http://sourceforge.net/projects/opencore-amr/> and follow the
+       instructions for installing the libraries.  Then pass
+       "--enable-libopencore-amrnb" and/or "--enable-libopencore-amrwb" to
+       configure to enable them.
+
+       VisualOn AMR-WB encoder library
+
+       FFmpeg can make use of the VisualOn AMR-WBenc library for AMR-WB
+       encoding.
+
+       Go to <http://sourceforge.net/projects/opencore-amr/> and follow the
+       instructions for installing the library.  Then pass
+       "--enable-libvo-amrwbenc" to configure to enable it.
+
+       Fraunhofer AAC library
+
+       FFmpeg can make use of the Fraunhofer AAC library for AAC decoding &
+       encoding.
+
+       Go to <http://sourceforge.net/projects/opencore-amr/> and follow the
+       instructions for installing the library.  Then pass
+       "--enable-libfdk-aac" to configure to enable it.
+
+   OpenH264
+       FFmpeg can make use of the OpenH264 library for H.264 decoding and
+       encoding.
+
+       Go to <http://www.openh264.org/> and follow the instructions for
+       installing the library. Then pass "--enable-libopenh264" to configure
+       to enable it.
+
+       For decoding, this library is much more limited than the built-in
+       decoder in libavcodec; currently, this library lacks support for
+       decoding B-frames and some other main/high profile features. (It
+       currently only supports constrained baseline profile and CABAC.) Using
+       it is mostly useful for testing and for taking advantage of Cisco's
+       patent portfolio license
+       (<http://www.openh264.org/BINARY_LICENSE.txt>).
+
+   OpenJPEG
+       FFmpeg can use the OpenJPEG libraries for decoding/encoding J2K videos.
+       Go to <http://www.openjpeg.org/> to get the libraries and follow the
+       installation instructions.  To enable using OpenJPEG in FFmpeg, pass
+       "--enable-libopenjpeg" to ./configure.
+
+   rav1e
+       FFmpeg can make use of rav1e (Rust AV1 Encoder) via its C bindings to
+       encode videos.  Go to <https://github.com/xiph/rav1e/> and follow the
+       instructions to build the C library. To enable using rav1e in FFmpeg,
+       pass "--enable-librav1e" to ./configure.
+
+   SVT-AV1
+       FFmpeg can make use of the Scalable Video Technology for AV1 library
+       for AV1 encoding.
+
+       Go to <https://gitlab.com/AOMediaCodec/SVT-AV1/> and follow the
+       instructions for installing the library. Then pass "--enable-libsvtav1"
+       to configure to enable it.
+
+   TwoLAME
+       FFmpeg can make use of the TwoLAME library for MP2 encoding.
+
+       Go to <http://www.twolame.org/> and follow the instructions for
+       installing the library.	Then pass "--enable-libtwolame" to configure
+       to enable it.
+
+   VapourSynth
+       FFmpeg can read VapourSynth scripts as input. To enable support, pass
+       "--enable-vapoursynth" to configure. Vapoursynth is detected via
+       "pkg-config". Versions 42 or greater supported.	See
+       <http://www.vapoursynth.com/>.
+
+       Due to security concerns, Vapoursynth scripts will not be autodetected
+       so the input format has to be forced. For ff* CLI tools, add "-f
+       vapoursynth" before the input "-i yourscript.vpy".
+
+   x264
+       FFmpeg can make use of the x264 library for H.264 encoding.
+
+       Go to <http://www.videolan.org/developers/x264.html> and follow the
+       instructions for installing the library. Then pass "--enable-libx264"
+       to configure to enable it.
+
+	   x264 is under the GNU Public License Version 2 or later (see
+	   <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html> for
+	   details), you must upgrade FFmpeg's license to GPL in order to use
+	   it.
+
+   x265
+       FFmpeg can make use of the x265 library for HEVC encoding.
+
+       Go to <http://x265.org/developers.html> and follow the instructions for
+       installing the library. Then pass "--enable-libx265" to configure to
+       enable it.
+
+	   x265 is under the GNU Public License Version 2 or later (see
+	   <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html> for
+	   details), you must upgrade FFmpeg's license to GPL in order to use
+	   it.
+
+   xavs
+       FFmpeg can make use of the xavs library for AVS encoding.
+
+       Go to <http://xavs.sf.net/> and follow the instructions for installing
+       the library. Then pass "--enable-libxavs" to configure to enable it.
+
+   xavs2
+       FFmpeg can make use of the xavs2 library for AVS2-P2/IEEE1857.4 video
+       encoding.
+
+       Go to <https://github.com/pkuvcl/xavs2> and follow the instructions for
+       installing the library. Then pass "--enable-libxavs2" to configure to
+       enable it.
+
+	   libxavs2 is under the GNU Public License Version 2 or later (see
+	   <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html> for
+	   details), you must upgrade FFmpeg's license to GPL in order to use
+	   it.
+
+   eXtra-fast Essential Video Encoder (XEVE)
+       FFmpeg can make use of the XEVE library for EVC video encoding.
+
+       Go to <https://github.com/mpeg5/xeve> and follow the instructions for
+       installing the XEVE library. Then pass "--enable-libxeve" to configure
+       to enable it.
+
+   eXtra-fast Essential Video Decoder (XEVD)
+       FFmpeg can make use of the XEVD library for EVC video decoding.
+
+       Go to <https://github.com/mpeg5/xevd> and follow the instructions for
+       installing the XEVD library. Then pass "--enable-libxevd" to configure
+       to enable it.
+
+   ZVBI
+       ZVBI is a VBI decoding library which can be used by FFmpeg to decode
+       DVB teletext pages and DVB teletext subtitles.
+
+       Go to <http://sourceforge.net/projects/zapping/> and follow the
+       instructions for installing the library. Then pass "--enable-libzvbi"
+       to configure to enable it.
+
+SUPPORTED FILE FORMATS
+       You can use the "-formats" and "-codecs" options to have an exhaustive
+       list.
+
+   File Formats
+       FFmpeg supports the following file formats through the "libavformat"
+       library:
+
+       Name  :	Encoding @tab Decoding @tab Comments
+       3dostr			  :    @tab X
+       4xm			  :    @tab X
+	       @tab 4X Technologies format, used in some games.
+
+       8088flex TMV		  :    @tab X
+       AAX			  :    @tab X
+	       @tab Audible Enhanced Audio format, used in audiobooks.
+
+       AA			  :    @tab X
+	       @tab Audible Format 2, 3, and 4, used in audiobooks.
+
+       ACT Voice		  :    @tab X
+	       @tab contains G.729 audio
+
+       Adobe Filmstrip		  :  X @tab X
+       Audio IFF (AIFF) 	  :  X @tab X
+       American Laser Games MM	  :    @tab X
+	       @tab Multimedia format used in games like Mad Dog McCree.
+
+       3GPP AMR 		  :  X @tab X
+       Amazing Studio Packed Animation File   :    @tab X
+	       @tab Multimedia format used in game Heart Of Darkness.
+
+       Apple HTTP Live Streaming  :    @tab X
+       Artworx Data Format	  :    @tab X
+       Interplay ACM		  :    @tab X
+	       @tab Audio only format used in some Interplay games.
+
+       ADP			  :    @tab X
+	       @tab Audio format used on the Nintendo Gamecube.
+
+       AFC			  :    @tab X
+	       @tab Audio format used on the Nintendo Gamecube.
+
+       ADS/SS2			  :    @tab X
+	       @tab Audio format used on the PS2.
+
+       APNG			  :  X @tab X
+       ASF			  :  X @tab X
+	       @tab Advanced / Active Streaming Format.
+
+       AST			  :  X @tab X
+	       @tab Audio format used on the Nintendo Wii.
+
+       AVI			  :  X @tab X
+       AviSynth 		  :    @tab X
+       AVR			  :    @tab X
+	       @tab Audio format used on Mac.
+
+       AVS			  :    @tab X
+	       @tab Multimedia format used by the Creature Shock game.
+
+       Beam Software SIFF	  :    @tab X
+	       @tab Audio and video format used in some games by Beam Software.
+
+       Bethesda Softworks VID	  :    @tab X
+	       @tab Used in some games from Bethesda Softworks.
+
+       Binary text		  :    @tab X
+       Bink			  :    @tab X
+	       @tab Multimedia format used by many games.
+
+       Bink Audio		  :    @tab X
+	       @tab Audio only multimedia format used by some games.
+
+       Bitmap Brothers JV	  :    @tab X
+	       @tab Used in Z and Z95 games.
+
+       BRP			  :    @tab X
+	       @tab Argonaut Games format.
+
+       Brute Force & Ignorance	  :    @tab X
+	       @tab Used in the game Flash Traffic: City of Angels.
+
+       BFSTM			  :    @tab X
+	       @tab Audio format used on the Nintendo WiiU (based on BRSTM).
+
+       BRSTM			  :    @tab X
+	       @tab Audio format used on the Nintendo Wii.
+
+       BW64			  :    @tab X
+	       @tab Broadcast Wave 64bit.
+
+       BWF			  :  X @tab X
+       codec2 (raw)		  :  X @tab X
+	       @tab Must be given -mode format option to decode correctly.
+
+       codec2 (.c2 files)	  :  X @tab X
+	       @tab Contains header with version and mode info, simplifying playback.
+
+       CRI ADX			  :  X @tab X
+	       @tab Audio-only format used in console video games.
+
+       CRI AIX			  :    @tab X
+       CRI HCA			  :    @tab X
+	       @tab Audio-only format used in console video games.
+
+       Discworld II BMV 	  :    @tab X
+       Interplay C93		  :    @tab X
+	       @tab Used in the game Cyberia from Interplay.
+
+       Delphine Software International CIN  :	 @tab X
+	       @tab Multimedia format used by Delphine Software games.
+
+       Digital Speech Standard (DSS)  :    @tab X
+       CD+G			  :    @tab X
+	       @tab Video format used by CD+G karaoke disks
+
+       Phantom Cine		  :    @tab X
+       Commodore CDXL		  :    @tab X
+	       @tab Amiga CD video format
+
+       Core Audio Format	  :  X @tab X
+	       @tab Apple Core Audio Format
+
+       CRC testing format	  :  X @tab
+       Creative Voice		  :  X @tab X
+	       @tab Created for the Sound Blaster Pro.
+
+       CRYO APC 		  :    @tab X
+	       @tab Audio format used in some games by CRYO Interactive Entertainment.
+
+       D-Cinema audio		  :  X @tab X
+       Deluxe Paint Animation	  :    @tab X
+       DCSTR			  :    @tab X
+       DFA			  :    @tab X
+	       @tab This format is used in Chronomaster game
+
+       DirectDraw Surface	  :    @tab X
+       DSD Stream File (DSF)	  :    @tab X
+       DV video 		  :  X @tab X
+       DXA			  :    @tab X
+	       @tab This format is used in the non-Windows version of the Feeble Files
+		    game and different game cutscenes repacked for use with ScummVM.
+
+       Electronic Arts cdata   :     @tab X
+       Electronic Arts Multimedia   :	  @tab X
+	       @tab Used in various EA games; files have extensions like WVE and UV2.
+
+       Ensoniq Paris Audio File   :    @tab X
+       FFM (FFserver live feed)   :  X @tab X
+       Flash (SWF)		  :  X @tab X
+       Flash 9 (AVM2)		  :  X @tab X
+	       @tab Only embedded audio is decoded.
+
+       FLI/FLC/FLX animation	  :    @tab X
+	       @tab .fli/.flc files
+
+       Flash Video (FLV)	  :  X @tab X
+	       @tab Macromedia Flash video files
+
+       framecrc testing format	  :  X @tab
+       FunCom ISS		  :    @tab X
+	       @tab Audio format used in various games from FunCom like The Longest Journey.
+
+       G.723.1			  :  X @tab X
+       G.726			  :    @tab X @tab Both left- and right-
+       justified.
+       G.729 BIT		  :  X @tab X
+       G.729 raw		  :    @tab X
+       GENH			  :    @tab X
+	       @tab Audio format for various games.
+
+       GIF Animation		  :  X @tab X
+       GXF			  :  X @tab X
+	       @tab General eXchange Format SMPTE 360M, used by Thomson Grass Valley
+		    playout servers.
+
+       HNM  :	 @tab X
+	       @tab Only version 4 supported, used in some games from Cryo Interactive
+
+       iCEDraw File		  :    @tab X
+       ICO			  :  X @tab X
+	       @tab Microsoft Windows ICO
+
+       id Quake II CIN video	  :    @tab X
+       id RoQ			  :  X @tab X
+	       @tab Used in Quake III, Jedi Knight 2 and other computer games.
+
+       IEC61937 encapsulation  :  X @tab X
+       IFF			  :    @tab X
+	       @tab Interchange File Format
+
+       IFV			  :    @tab X
+	       @tab A format used by some old CCTV DVRs.
+
+       iLBC			  :  X @tab X
+       Interplay MVE		  :    @tab X
+	       @tab Format used in various Interplay computer games.
+
+       Iterated Systems ClearVideo  :	   @tab  X
+	       @tab I-frames only
+
+       IV8			  :    @tab X
+	       @tab A format generated by IndigoVision 8000 video server.
+
+       IVF (On2)		  :  X @tab X
+	       @tab A format used by libvpx
+
+       Internet Video Recording   :    @tab X
+       IRCAM			  :  X @tab X
+       LAF			  :    @tab X
+	       @tab Limitless Audio Format
+
+       LATM			  :  X @tab X
+       LMLM4			  :    @tab X
+	       @tab Used by Linux Media Labs MPEG-4 PCI boards
+
+       LOAS			  :    @tab X
+	       @tab contains LATM multiplexed AAC audio
+
+       LRC			  :  X @tab X
+       LVF			  :    @tab X
+       LXF			  :    @tab X
+	       @tab VR native stream format, used by Leitch/Harris' video servers.
+
+       Magic Lantern Video (MLV)  :    @tab X
+       Matroska 		  :  X @tab X
+       Matroska audio		  :  X @tab
+       FFmpeg metadata		  :  X @tab X
+	       @tab Metadata in text format.
+
+       MAXIS XA 		  :    @tab X
+	       @tab Used in Sim City 3000; file extension .xa.
+
+       MCA			  :    @tab X
+	       @tab Used in some games from Capcom; file extension .mca.
+
+       MD Studio		  :    @tab X
+       Metal Gear Solid: The Twin Snakes  :  @tab X
+       Megalux Frame		  :    @tab X
+	       @tab Used by Megalux Ultimate Paint
+
+       MobiClip MODS		  :    @tab X
+       MobiClip MOFLEX		  :    @tab X
+       Mobotix .mxg		  :    @tab X
+       Monkey's Audio		  :    @tab X
+       Motion Pixels MVI	  :    @tab X
+       MOV/QuickTime/MP4	  :  X @tab X
+	       @tab 3GP, 3GP2, PSP, iPod variants supported
+
+       MP2			  :  X @tab X
+       MP3			  :  X @tab X
+       MPEG-1 System		  :  X @tab X
+	       @tab muxed audio and video, VCD format supported
+
+       MPEG-PS (program stream)   :  X @tab X
+	       @tab also known as C<VOB> file, SVCD and DVD format supported
+
+       MPEG-TS (transport stream)  :  X @tab X
+	       @tab also known as DVB Transport Stream
+
+       MPEG-4			  :  X @tab X
+	       @tab MPEG-4 is a variant of QuickTime.
+
+       MSF			  :    @tab X
+	       @tab Audio format used on the PS3.
+
+       Mirillis FIC video	  :    @tab X
+	       @tab No cursor rendering.
+
+       MIDI Sample Dump Standard  :    @tab X
+       MIME multipart JPEG	  :  X @tab
+       MSN TCP webcam		  :    @tab X
+	       @tab Used by MSN Messenger webcam streams.
+
+       MTV			  :    @tab X
+       Musepack 		  :    @tab X
+       Musepack SV8		  :    @tab X
+       Material eXchange Format (MXF)  :  X @tab X
+	       @tab SMPTE 377M, used by D-Cinema, broadcast industry.
+
+       Material eXchange Format (MXF), D-10 Mapping  :	X @tab X
+	       @tab SMPTE 386M, D-10/IMX Mapping.
+
+       NC camera feed		  :    @tab X
+	       @tab NC (AVIP NC4600) camera streams
+
+       NIST SPeech HEader REsources  :	  @tab X
+       Computerized Speech Lab NSP  :	 @tab X
+       NTT TwinVQ (VQF) 	  :    @tab X
+	       @tab Nippon Telegraph and Telephone Corporation TwinVQ.
+
+       Nullsoft Streaming Video   :    @tab X
+       NuppelVideo		  :    @tab X
+       NUT			  :  X @tab X
+	       @tab NUT Open Container Format
+
+       Ogg			  :  X @tab X
+       Playstation Portable PMP   :    @tab X
+       Portable Voice Format	  :    @tab X
+       RK Audio (RKA)		  :    @tab X
+       TechnoTrend PVA		  :    @tab X
+	       @tab Used by TechnoTrend DVB PCI boards.
+
+       QCP			  :    @tab X
+       raw ADTS (AAC)		  :  X @tab X
+       raw AC-3 		  :  X @tab X
+       raw AMR-NB		  :    @tab X
+       raw AMR-WB		  :    @tab X
+       raw APAC 		  :    @tab X
+       raw aptX 		  :  X @tab X
+       raw aptX HD		  :  X @tab X
+       raw Bonk 		  :    @tab X
+       raw Chinese AVS video	  :  X @tab X
+       raw DFPWM		  :  X @tab X
+       raw Dirac		  :  X @tab X
+       raw DNxHD		  :  X @tab X
+       raw DTS			  :  X @tab X
+       raw DTS-HD		  :    @tab X
+       raw E-AC-3		  :  X @tab X
+       raw EVC			  :  X @tab X
+       raw FLAC 		  :  X @tab X
+       raw GSM			  :    @tab X
+       raw H.261		  :  X @tab X
+       raw H.263		  :  X @tab X
+       raw H.264		  :  X @tab X
+       raw HEVC 		  :  X @tab X
+       raw Ingenient MJPEG	  :    @tab X
+       raw MJPEG		  :  X @tab X
+       raw MLP			  :    @tab X
+       raw MPEG 		  :    @tab X
+       raw MPEG-1		  :    @tab X
+       raw MPEG-2		  :    @tab X
+       raw MPEG-4		  :  X @tab X
+       raw NULL 		  :  X @tab
+       raw video		  :  X @tab X
+       raw id RoQ		  :  X @tab
+       raw OBU			  :  X @tab X
+       raw OSQ			  :    @tab X
+       raw SBC			  :  X @tab X
+       raw Shorten		  :    @tab X
+       raw TAK			  :    @tab X
+       raw TrueHD		  :  X @tab X
+       raw VC-1 		  :  X @tab X
+       raw PCM A-law		  :  X @tab X
+       raw PCM mu-law		  :  X @tab X
+       raw PCM Archimedes VIDC	  :  X @tab X
+       raw PCM signed 8 bit	  :  X @tab X
+       raw PCM signed 16 bit big-endian   :  X @tab X
+       raw PCM signed 16 bit little-endian   :	X @tab X
+       raw PCM signed 24 bit big-endian   :  X @tab X
+       raw PCM signed 24 bit little-endian   :	X @tab X
+       raw PCM signed 32 bit big-endian   :  X @tab X
+       raw PCM signed 32 bit little-endian   :	X @tab X
+       raw PCM signed 64 bit big-endian   :  X @tab X
+       raw PCM signed 64 bit little-endian   :	X @tab X
+       raw PCM unsigned 8 bit	  :  X @tab X
+       raw PCM unsigned 16 bit big-endian   :  X @tab X
+       raw PCM unsigned 16 bit little-endian   :  X @tab X
+       raw PCM unsigned 24 bit big-endian   :  X @tab X
+       raw PCM unsigned 24 bit little-endian   :  X @tab X
+       raw PCM unsigned 32 bit big-endian   :  X @tab X
+       raw PCM unsigned 32 bit little-endian   :  X @tab X
+       raw PCM 16.8 floating point little-endian  :    @tab X
+       raw PCM 24.0 floating point little-endian  :    @tab X
+       raw PCM floating-point 32 bit big-endian   :  X @tab X
+       raw PCM floating-point 32 bit little-endian   :	X @tab X
+       raw PCM floating-point 64 bit big-endian   :  X @tab X
+       raw PCM floating-point 64 bit little-endian   :	X @tab X
+       RDT			  :    @tab X
+       REDCODE R3D		  :    @tab X
+	       @tab File format used by RED Digital cameras, contains JPEG 2000 frames and PCM audio.
+
+       RealMedia		  :  X @tab X
+       Redirector		  :    @tab X
+       RedSpark 		  :    @tab X
+       Renderware TeXture Dictionary  :    @tab X
+       Resolume DXV		  :  X @tab X
+	       @tab Encoding is only supported for the DXT1 (Normal Quality, No Alpha) texture format.
+
+       RF64			  :    @tab X
+       RL2			  :    @tab X
+	       @tab Audio and video format used in some games by Entertainment Software Partners.
+
+       RPL/ARMovie		  :    @tab X
+       Lego Mindstorms RSO	  :  X @tab X
+       RSD			  :    @tab X
+       RTMP			  :  X @tab X
+	       @tab Output is performed by publishing stream to RTMP server
+
+       RTP			  :  X @tab X
+       RTSP			  :  X @tab X
+       Sample Dump eXchange	  :    @tab X
+       SAP			  :  X @tab X
+       SBG			  :    @tab X
+       SDNS			  :    @tab X
+       SDP			  :    @tab X
+       SER			  :    @tab X
+       Digital Pictures SGA	  :    @tab X
+       Sega FILM/CPK		  :  X @tab X
+	       @tab Used in many Sega Saturn console games.
+
+       Silicon Graphics Movie	  :    @tab X
+       Sierra SOL		  :    @tab X
+	       @tab .sol files used in Sierra Online games.
+
+       Sierra VMD		  :    @tab X
+	       @tab Used in Sierra CD-ROM games.
+
+       Smacker			  :    @tab X
+	       @tab Multimedia format used by many games.
+
+       SMJPEG			  :  X @tab X
+	       @tab Used in certain Loki game ports.
+
+       SMPTE 337M encapsulation   :    @tab X
+       Smush			  :    @tab X
+	       @tab Multimedia format used in some LucasArts games.
+
+       Sony OpenMG (OMA)	  :  X @tab X
+	       @tab Audio format used in Sony Sonic Stage and Sony Vegas.
+
+       Sony PlayStation STR	  :    @tab X
+       Sony Wave64 (W64)	  :  X @tab X
+       SoX native format	  :  X @tab X
+       SUN AU format		  :  X @tab X
+       SUP raw PGS subtitles	  :  X @tab X
+       SVAG			  :    @tab X
+	       @tab Audio format used in Konami PS2 games.
+
+       TDSC			  :    @tab X
+       Text files		  :    @tab X
+       THP			  :    @tab X
+	       @tab Used on the Nintendo GameCube.
+
+       Tiertex Limited SEQ	  :    @tab X
+	       @tab Tiertex .seq files used in the DOS CD-ROM version of the game Flashback.
+
+       True Audio		  :  X @tab X
+       VAG			  :    @tab X
+	       @tab Audio format used in many Sony PS2 games.
+
+       VC-1 test bitstream	  :  X @tab X
+       Vidvox Hap		  :  X @tab X
+       Vivo			  :    @tab X
+       VPK			  :    @tab X
+	       @tab Audio format used in Sony PS games.
+
+       Marble WADY		  :    @tab X
+       WAV			  :  X @tab X
+       Waveform Archiver	  :    @tab X
+       WavPack			  :  X @tab X
+       WebM			  :  X @tab X
+       Windows Televison (WTV)	  :  X @tab X
+       Wing Commander III movie   :    @tab X
+	       @tab Multimedia format used in Origin's Wing Commander III computer game.
+
+       Westwood Studios audio	  :  X @tab X
+	       @tab Multimedia format used in Westwood Studios games.
+
+       Westwood Studios VQA	  :    @tab X
+	       @tab Multimedia format used in Westwood Studios games.
+
+       Wideband Single-bit Data (WSD)  :    @tab X
+       WVE			  :    @tab X
+       Konami XMD		  :    @tab X
+       XMV			  :    @tab X
+	       @tab Microsoft video container used in Xbox games.
+
+       XVAG			  :    @tab X
+	       @tab Audio format used on the PS3.
+
+       xWMA			  :    @tab X
+	       @tab Microsoft audio container used by XAudio 2.
+
+       eXtended BINary text (XBIN)  :  @tab X
+       YUV4MPEG pipe		  :  X @tab X
+       Psygnosis YOP		  :    @tab X
+
+       "X" means that the feature in that column (encoding / decoding) is
+       supported.
+
+   Image Formats
+       FFmpeg can read and write images for each frame of a video sequence.
+       The following image formats are supported:
+
+       Name  :	Encoding @tab Decoding @tab Comments
+       .Y.U.V	     :	X @tab X
+	       @tab one raw file per component
+
+       Alias PIX     :	X @tab X
+	       @tab Alias/Wavefront PIX image format
+
+       animated GIF  :	X @tab X
+       APNG	     :	X @tab X
+	       @tab Animated Portable Network Graphics
+
+       BMP	     :	X @tab X
+	       @tab Microsoft BMP image
+
+       BRender PIX   :	  @tab X
+	       @tab Argonaut BRender 3D engine image format.
+
+       CRI	     :	  @tab X
+	       @tab Cintel RAW
+
+       DPX	     :	X @tab X
+	       @tab Digital Picture Exchange
+
+       EXR	     :	  @tab X
+	       @tab OpenEXR
+
+       FITS	     :	X @tab X
+	       @tab Flexible Image Transport System
+
+       HDR	     :	X @tab X
+	       @tab Radiance HDR RGBE Image format
+
+       IMG	     :	  @tab X
+	       @tab GEM Raster image
+
+       JPEG	     :	X @tab X
+	       @tab Progressive JPEG is not supported.
+
+       JPEG 2000     :	X @tab X
+       JPEG-LS	     :	X @tab X
+       LJPEG	     :	X @tab
+	       @tab Lossless JPEG
+
+       Media 100     :	  @tab X
+       MSP	     :	  @tab X
+	       @tab Microsoft Paint image
+
+       PAM	     :	X @tab X
+	       @tab PAM is a PNM extension with alpha support.
+
+       PBM	     :	X @tab X
+	       @tab Portable BitMap image
+
+       PCD	     :	  @tab X
+	       @tab PhotoCD
+
+       PCX	     :	X @tab X
+	       @tab PC Paintbrush
+
+       PFM	     :	X @tab X
+	       @tab Portable FloatMap image
+
+       PGM	     :	X @tab X
+	       @tab Portable GrayMap image
+
+       PGMYUV	     :	X @tab X
+	       @tab PGM with U and V components in YUV 4:2:0
+
+       PGX	     :	  @tab X
+	       @tab PGX file decoder
+
+       PHM	     :	X @tab X
+	       @tab Portable HalfFloatMap image
+
+       PIC	     :	@tab X
+	       @tab Pictor/PC Paint
+
+       PNG	     :	X @tab X
+	       @tab Portable Network Graphics image
+
+       PPM	     :	X @tab X
+	       @tab Portable PixelMap image
+
+       PSD	     :	  @tab X
+	       @tab Photoshop
+
+       PTX	     :	  @tab X
+	       @tab V.Flash PTX format
+
+       QOI	     :	X @tab X
+	       @tab Quite OK Image format
+
+       SGI	     :	X @tab X
+	       @tab SGI RGB image format
+
+       Sun Rasterfile	:  X @tab X
+	       @tab Sun RAS image format
+
+       TIFF	     :	X @tab X
+	       @tab YUV, JPEG and some extension is not supported yet.
+
+       Truevision Targa   :  X @tab X
+	       @tab Targa (.TGA) image format
+
+       VBN   :	X @tab X
+	       @tab Vizrt Binary Image format
+
+       WBMP	     :	X @tab X
+	       @tab Wireless Application Protocol Bitmap image format
+
+       WebP	     :	E @tab X
+	       @tab WebP image format, encoding supported through external library libwebp
+
+       XBM   :	X @tab X
+	       @tab X BitMap image format
+
+       XFace  :  X @tab X
+	       @tab X-Face image format
+
+       XPM   :	  @tab X
+	       @tab X PixMap image format
+
+       XWD   :	X @tab X
+	       @tab X Window Dump image format
+
+       "X" means that the feature in that column (encoding / decoding) is
+       supported.
+
+       "E" means that support is provided through an external library.
+
+   Video Codecs
+       Name  :	Encoding @tab Decoding @tab Comments
+       4X Movie 	       :      @tab  X
+	       @tab Used in certain computer games.
+
+       8088flex TMV	       :      @tab  X
+       A64 multicolor	       :   X  @tab
+	       @tab Creates video suitable to be played on a commodore 64 (multicolor mode).
+
+       Amazing Studio PAF Video  :	@tab  X
+       American Laser Games MM	 :     @tab X
+	       @tab Used in games like Mad Dog McCree.
+
+       Amuse Graphics Movie    :      @tab  X
+       AMV Video	       :   X  @tab  X
+	       @tab Used in Chinese MP3 players.
+
+       ANSI/ASCII art	       :      @tab  X
+       Apple Intermediate Codec  :	@tab  X
+       Apple MJPEG-B	       :      @tab  X
+       Apple Pixlet	       :      @tab  X
+       Apple ProRes	       :   X  @tab  X
+	       @tab fourcc: apch,apcn,apcs,apco,ap4h,ap4x
+
+       Apple QuickDraw	       :      @tab  X
+	       @tab fourcc: qdrw
+
+       Argonaut Video	       :      @tab  X
+	       @tab Used in some Argonaut games.
+
+       Asus v1		       :   X  @tab  X
+	       @tab fourcc: ASV1
+
+       Asus v2		       :   X  @tab  X
+	       @tab fourcc: ASV2
+
+       ATI VCR1 	       :      @tab  X
+	       @tab fourcc: VCR1
+
+       ATI VCR2 	       :      @tab  X
+	       @tab fourcc: VCR2
+
+       Auravision Aura	       :      @tab  X
+       Auravision Aura 2       :      @tab  X
+       Autodesk Animator Flic video   :      @tab  X
+       Autodesk RLE	       :      @tab  X
+	       @tab fourcc: AASC
+
+       AV1		       :   E  @tab  E
+	       @tab Supported through external libraries libaom, libdav1d, librav1e and libsvtav1
+
+       Avid 1:1 10-bit RGB Packer   :	X  @tab  X
+	       @tab fourcc: AVrp
+
+       AVS (Audio Video Standard) video   :	 @tab  X
+	       @tab Video encoding used by the Creature Shock game.
+
+       AVS2-P2/IEEE1857.4      :   E  @tab  E
+	       @tab Supported through external libraries libxavs2 and libdavs2
+
+       AVS3-P2/IEEE1857.10     :      @tab  E
+	       @tab Supported through external library libuavs3d
+
+       AYUV		       :   X  @tab  X
+	       @tab Microsoft uncompressed packed 4:4:4:4
+
+       Beam Software VB        :      @tab  X
+       Bethesda VID video      :      @tab  X
+	       @tab Used in some games from Bethesda Softworks.
+
+       Bink Video	       :      @tab  X
+       BitJazz SheerVideo      :      @tab  X
+       Bitmap Brothers JV video   :    @tab X
+       y41p Brooktree uncompressed 4:1:1 12-bit      :	 X  @tab  X
+       Brooktree ProSumer Video   :	 @tab  X
+	       @tab fourcc: BT20
+
+       Brute Force & Ignorance	  :    @tab X
+	       @tab Used in the game Flash Traffic: City of Angels.
+
+       C93 video	       :      @tab  X
+	       @tab Codec used in Cyberia game.
+
+       CamStudio	       :      @tab  X
+	       @tab fourcc: CSCD
+
+       CD+G		       :      @tab  X
+	       @tab Video codec for CD+G karaoke disks
+
+       CDXL		       :      @tab  X
+	       @tab Amiga CD video codec
+
+       Chinese AVS video       :   E  @tab  X
+	       @tab AVS1-P2, JiZhun profile, encoding through external library libxavs
+
+       Delphine Software International CIN video   :	  @tab	X
+	       @tab Codec used in Delphine Software International games.
+
+       Discworld II BMV Video  :      @tab  X
+       CineForm HD	       :   X  @tab  X
+       Canopus HQ	       :      @tab  X
+       Canopus HQA	       :      @tab  X
+       Canopus HQX	       :      @tab  X
+       Canopus Lossless Codec  :      @tab  X
+       CDToons		       :      @tab  X
+	       @tab Codec used in various Broderbund games.
+
+       Cinepak		       :      @tab  X
+       Cirrus Logic AccuPak    :   X  @tab  X
+	       @tab fourcc: CLJR
+
+       CPiA Video Format       :      @tab  X
+       Creative YUV (CYUV)     :      @tab  X
+       DFA		       :      @tab  X
+	       @tab Codec used in Chronomaster game.
+
+       Dirac		       :   E  @tab  X
+	       @tab supported though the native vc2 (Dirac Pro) encoder
+
+       Deluxe Paint Animation  :      @tab  X
+       DNxHD		       :    X @tab  X
+	       @tab aka SMPTE VC3
+
+       Duck TrueMotion 1.0    :      @tab  X
+	       @tab fourcc: DUCK
+
+       Duck TrueMotion 2.0     :      @tab  X
+	       @tab fourcc: TM20
+
+       Duck TrueMotion 2.0 RT  :      @tab  X
+	       @tab fourcc: TR20
+
+       DV (Digital Video)      :   X  @tab  X
+       Dxtory capture format   :      @tab  X
+       Feeble Files/ScummVM DXA   :	 @tab  X
+	       @tab Codec originally used in Feeble Files game.
+
+       Electronic Arts CMV video   :	  @tab	X
+	       @tab Used in NHL 95 game.
+
+       Electronic Arts Madcow video   :      @tab  X
+       Electronic Arts TGV video   :	  @tab	X
+       Electronic Arts TGQ video   :	  @tab	X
+       Electronic Arts TQI video   :	  @tab	X
+       Escape 124	       :      @tab  X
+       Escape 130	       :      @tab  X
+       EVC / MPEG-5 Part 1     :   E  @tab  E
+	       @tab encoding and decoding supported through external libraries libxeve and libxevd
+
+       FFmpeg video codec #1   :   X  @tab  X
+	       @tab lossless codec (fourcc: FFV1)
+
+       Flash Screen Video v1   :   X  @tab  X
+	       @tab fourcc: FSV1
+
+       Flash Screen Video v2   :   X  @tab  X
+       Flash Video (FLV)       :   X  @tab  X
+	       @tab Sorenson H.263 used in Flash
+
+       FM Screen Capture Codec	 :	@tab  X
+       Forward Uncompressed    :      @tab  X
+       Fraps		       :      @tab  X
+       Go2Meeting	       :      @tab  X
+	       @tab fourcc: G2M2, G2M3
+
+       Go2Webinar	       :      @tab  X
+	       @tab fourcc: G2M4
+
+       Gremlin Digital Video   :      @tab  X
+       H.261		       :   X  @tab  X
+       H.263 / H.263-1996      :   X  @tab  X
+       H.263+ / H.263-1998 / H.263 version 2   :   X  @tab  X
+       H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10   :   E  @tab	X
+	       @tab encoding supported through external library libx264 and OpenH264
+
+       HEVC		       :   X  @tab  X
+	       @tab encoding supported through external library libx265 and libkvazaar
+
+       HNM version 4	       :      @tab  X
+       HuffYUV		       :   X  @tab  X
+       HuffYUV FFmpeg variant  :   X  @tab  X
+       IBM Ultimotion	       :      @tab  X
+	       @tab fourcc: ULTI
+
+       id Cinematic video      :      @tab  X
+	       @tab Used in Quake II.
+
+       id RoQ video	       :   X  @tab  X
+	       @tab Used in Quake III, Jedi Knight 2, other computer games.
+
+       IFF ILBM 	       :      @tab  X
+	       @tab IFF interleaved bitmap
+
+       IFF ByteRun1	       :      @tab  X
+	       @tab IFF run length encoded bitmap
+
+       Infinity IMM4	       :      @tab  X
+       Intel H.263	       :      @tab  X
+       Intel Indeo 2	       :      @tab  X
+       Intel Indeo 3	       :      @tab  X
+       Intel Indeo 4	       :      @tab  X
+       Intel Indeo 5	       :      @tab  X
+       Interplay C93	       :      @tab  X
+	       @tab Used in the game Cyberia from Interplay.
+
+       Interplay MVE video     :      @tab  X
+	       @tab Used in Interplay .MVE files.
+
+       J2K  :	X  @tab  X
+       Karl Morton's video codec   :	  @tab	X
+	       @tab Codec used in Worms games.
+
+       Kega Game Video (KGV1)  :       @tab  X
+	       @tab Kega emulator screen capture codec.
+
+       Lagarith 	       :      @tab  X
+       LCL (LossLess Codec Library) MSZH   :	  @tab	X
+       LCL (LossLess Codec Library) ZLIB   :   E  @tab	E
+       LEAD MCMP	       :      @tab  X
+       LOCO		       :      @tab  X
+       LucasArts SANM/Smush    :      @tab  X
+	       @tab Used in LucasArts games / SMUSH animations.
+
+       lossless MJPEG	       :   X  @tab  X
+       MagicYUV Video	       :   X  @tab  X
+       Mandsoft Screen Capture Codec   :      @tab  X
+       Microsoft ATC Screen    :      @tab  X
+	       @tab Also known as Microsoft Screen 3.
+
+       Microsoft Expression Encoder Screen   :	    @tab  X
+	       @tab Also known as Microsoft Titanium Screen 2.
+
+       Microsoft RLE	       :   X  @tab  X
+       Microsoft Screen 1      :      @tab  X
+	       @tab Also known as Windows Media Video V7 Screen.
+
+       Microsoft Screen 2      :      @tab  X
+	       @tab Also known as Windows Media Video V9 Screen.
+
+       Microsoft Video 1       :      @tab  X
+       Mimic		       :      @tab  X
+	       @tab Used in MSN Messenger Webcam streams.
+
+       Miro VideoXL	       :      @tab  X
+	       @tab fourcc: VIXL
+
+       MJPEG (Motion JPEG)     :   X  @tab  X
+       Mobotix MxPEG video     :      @tab  X
+       Motion Pixels video     :      @tab  X
+       MPEG-1 video	       :   X  @tab  X
+       MPEG-2 video	       :   X  @tab  X
+       MPEG-4 part 2	       :   X  @tab  X
+	       @tab libxvidcore can be used alternatively for encoding.
+
+       MPEG-4 part 2 Microsoft variant version 1   :	  @tab	X
+       MPEG-4 part 2 Microsoft variant version 2   :   X  @tab	X
+       MPEG-4 part 2 Microsoft variant version 3   :   X  @tab	X
+       Newtek SpeedHQ		     :	 X  @tab  X
+       Nintendo Gamecube THP video   :	    @tab  X
+       NotchLC		       :      @tab  X
+       NuppelVideo/RTjpeg      :      @tab  X
+	       @tab Video encoding used in NuppelVideo files.
+
+       On2 VP3		       :      @tab  X
+	       @tab still experimental
+
+       On2 VP4		       :      @tab  X
+	       @tab fourcc: VP40
+
+       On2 VP5		       :      @tab  X
+	       @tab fourcc: VP50
+
+       On2 VP6		       :      @tab  X
+	       @tab fourcc: VP60,VP61,VP62
+
+       On2 VP7		       :      @tab  X
+	       @tab fourcc: VP70,VP71
+
+       VP8		       :   E  @tab  X
+	       @tab fourcc: VP80, encoding supported through external library libvpx
+
+       VP9		       :   E  @tab  X
+	       @tab encoding supported through external library libvpx
+
+       Pinnacle TARGA CineWave YUV16  :      @tab  X
+	       @tab fourcc: Y216
+
+       Q-team QPEG	       :      @tab  X
+	       @tab fourccs: QPEG, Q1.0, Q1.1
+
+       QuickTime 8BPS video    :      @tab  X
+       QuickTime Animation (RLE) video	 :   X	@tab  X
+	       @tab fourcc: 'rle '
+
+       QuickTime Graphics (SMC)   :   X  @tab  X
+	       @tab fourcc: 'smc '
+
+       QuickTime video (RPZA)  :   X  @tab  X
+	       @tab fourcc: rpza
+
+       R10K AJA Kona 10-bit RGB Codec	   :   X  @tab	X
+       R210 Quicktime Uncompressed RGB 10-bit	   :   X  @tab	X
+       Raw Video	       :   X  @tab  X
+       RealVideo 1.0	       :   X  @tab  X
+       RealVideo 2.0	       :   X  @tab  X
+       RealVideo 3.0	       :      @tab  X
+	       @tab still far from ideal
+
+       RealVideo 4.0	       :      @tab  X
+       Renderware TXD (TeXture Dictionary)   :	    @tab  X
+	       @tab Texture dictionaries used by the Renderware Engine.
+
+       RivaTuner Video	       :      @tab  X
+	       @tab fourcc: 'RTV1'
+
+       RL2 video	       :      @tab  X
+	       @tab used in some games by Entertainment Software Partners
+
+       ScreenPressor	       :      @tab  X
+       Screenpresso	       :      @tab  X
+       Screen Recorder Gold Codec   :	   @tab  X
+       Sierra VMD video        :      @tab  X
+	       @tab Used in Sierra VMD files.
+
+       Silicon Graphics Motion Video Compressor 1 (MVC1)   :	  @tab	X
+       Silicon Graphics Motion Video Compressor 2 (MVC2)   :	  @tab	X
+       Silicon Graphics RLE 8-bit video   :	 @tab  X
+       Smacker video	       :      @tab  X
+	       @tab Video encoding used in Smacker.
+
+       SMPTE VC-1	       :      @tab  X
+       Snow		       :   X  @tab  X
+	       @tab experimental wavelet codec (fourcc: SNOW)
+
+       Sony PlayStation MDEC (Motion DECoder)	:      @tab  X
+       Sorenson Vector Quantizer 1   :	 X  @tab  X
+	       @tab fourcc: SVQ1
+
+       Sorenson Vector Quantizer 3   :	    @tab  X
+	       @tab fourcc: SVQ3
+
+       Sunplus JPEG (SP5X)     :      @tab  X
+	       @tab fourcc: SP5X
+
+       TechSmith Screen Capture Codec	:      @tab  X
+	       @tab fourcc: TSCC
+
+       TechSmith Screen Capture Codec 2   :	 @tab  X
+	       @tab fourcc: TSC2
+
+       Theora		       :   E  @tab  X
+	       @tab encoding supported through external library libtheora
+
+       Tiertex Limited SEQ video   :	  @tab	X
+	       @tab Codec used in DOS CD-ROM FlashBack game.
+
+       Ut Video 	       :   X  @tab  X
+       v210 QuickTime uncompressed 4:2:2 10-bit      :	 X  @tab  X
+       v308 QuickTime uncompressed 4:4:4	     :	 X  @tab  X
+       v408 QuickTime uncompressed 4:4:4:4	     :	 X  @tab  X
+       v410 QuickTime uncompressed 4:4:4 10-bit      :	 X  @tab  X
+       VBLE Lossless Codec     :      @tab  X
+       vMix Video	       :      @tab  X
+	       @tab fourcc: 'VMX1'
+
+       VMware Screen Codec / VMware Video   :	   @tab  X
+	       @tab Codec used in videos captured by VMware.
+
+       Westwood Studios VQA (Vector Quantized Animation) video	 :	@tab
+       X
+       Windows Media Image     :      @tab  X
+       Windows Media Video 7   :   X  @tab  X
+       Windows Media Video 8   :   X  @tab  X
+       Windows Media Video 9   :      @tab  X
+	       @tab not completely working
+
+       Wing Commander III / Xan   :	 @tab  X
+	       @tab Used in Wing Commander III .MVE files.
+
+       Wing Commander IV / Xan	 :	@tab  X
+	       @tab Used in Wing Commander IV.
+
+       Winnov WNV1	       :      @tab  X
+       WMV7		       :   X  @tab  X
+       YAMAHA SMAF	       :   X  @tab  X
+       Psygnosis YOP Video     :      @tab  X
+       yuv4		       :   X  @tab  X
+	       @tab libquicktime uncompressed packed 4:2:0
+
+       ZeroCodec Lossless Video  :	@tab  X
+       ZLIB		       :   X  @tab  X
+	       @tab part of LCL, encoder experimental
+
+       Zip Motion Blocks Video	 :    X @tab  X
+	       @tab Encoder works only in PAL8.
+
+       "X" means that the feature in that column (encoding / decoding) is
+       supported.
+
+       "E" means that support is provided through an external library.
+
+   Audio Codecs
+       Name  :	Encoding @tab Decoding @tab Comments
+       8SVX exponential        :      @tab  X
+       8SVX fibonacci	       :      @tab  X
+       AAC		       :  EX  @tab  X
+	       @tab encoding supported through internal encoder and external library libfdk-aac
+
+       AAC+		       :   E  @tab  IX
+	       @tab encoding supported through external library libfdk-aac
+
+       AC-3		       :  IX  @tab  IX
+       ACELP.KELVIN	       :      @tab  X
+       ADPCM 4X Movie	       :      @tab  X
+       ADPCM Yamaha AICA       :      @tab  X
+       ADPCM AmuseGraphics Movie  :	@tab  X
+       ADPCM Argonaut Games    :  X   @tab  X
+       ADPCM CDROM XA	       :      @tab  X
+       ADPCM Creative Technology  :	 @tab  X
+	       @tab 16 -E<gt> 4, 8 -E<gt> 4, 8 -E<gt> 3, 8 -E<gt> 2
+
+       ADPCM Electronic Arts   :      @tab  X
+	       @tab Used in various EA titles.
+
+       ADPCM Electronic Arts Maxis CDROM XS   :      @tab  X
+	       @tab Used in Sim City 3000.
+
+       ADPCM Electronic Arts R1   :	 @tab  X
+       ADPCM Electronic Arts R2   :	 @tab  X
+       ADPCM Electronic Arts R3   :	 @tab  X
+       ADPCM Electronic Arts XAS  :	 @tab  X
+       ADPCM G.722	       :   X  @tab  X
+       ADPCM G.726	       :   X  @tab  X
+       ADPCM IMA Acorn Replay  :      @tab  X
+       ADPCM IMA AMV	       :   X  @tab  X
+	       @tab Used in AMV files
+
+       ADPCM IMA Cunning Developments	:      @tab  X
+       ADPCM IMA Electronic Arts EACS	:      @tab  X
+       ADPCM IMA Electronic Arts SEAD	:      @tab  X
+       ADPCM IMA Funcom        :      @tab  X
+       ADPCM IMA High Voltage Software ALP	 :   X	@tab  X
+       ADPCM IMA Mobiclip MOFLEX   :	  @tab	X
+       ADPCM IMA QuickTime     :   X  @tab  X
+       ADPCM IMA Simon & Schuster Interactive	 :   X	@tab  X
+       ADPCM IMA Ubisoft APM   :   X  @tab  X
+       ADPCM IMA Loki SDL MJPEG   :	 @tab  X
+       ADPCM IMA WAV	       :   X  @tab  X
+       ADPCM IMA Westwood      :      @tab  X
+       ADPCM ISS IMA	       :      @tab  X
+	       @tab Used in FunCom games.
+
+       ADPCM IMA Dialogic      :      @tab  X
+       ADPCM IMA Duck DK3      :      @tab  X
+	       @tab Used in some Sega Saturn console games.
+
+       ADPCM IMA Duck DK4      :      @tab  X
+	       @tab Used in some Sega Saturn console games.
+
+       ADPCM IMA Radical       :      @tab  X
+       ADPCM Microsoft	       :   X  @tab  X
+       ADPCM MS IMA	       :   X  @tab  X
+       ADPCM Nintendo Gamecube AFC   :	    @tab  X
+       ADPCM Nintendo Gamecube DTK   :	    @tab  X
+       ADPCM Nintendo THP   :	   @tab  X
+       ADPCM Playstation       :      @tab  X
+       ADPCM QT IMA	       :   X  @tab  X
+       ADPCM SEGA CRI ADX      :   X  @tab  X
+	       @tab Used in Sega Dreamcast games.
+
+       ADPCM Shockwave Flash   :   X  @tab  X
+       ADPCM Sound Blaster Pro 2-bit   :      @tab  X
+       ADPCM Sound Blaster Pro 2.6-bit	 :	@tab  X
+       ADPCM Sound Blaster Pro 4-bit   :      @tab  X
+       ADPCM VIMA	       :      @tab  X
+	       @tab Used in LucasArts SMUSH animations.
+
+       ADPCM Konami XMD        :      @tab  X
+       ADPCM Westwood Studios IMA	:   X @tab  X
+	       @tab Used in Westwood Studios games like Command and Conquer.
+
+       ADPCM Yamaha	       :   X  @tab  X
+       ADPCM Zork	       :      @tab  X
+       AMR-NB		       :   E  @tab  X
+	       @tab encoding supported through external library libopencore-amrnb
+
+       AMR-WB		       :   E  @tab  X
+	       @tab encoding supported through external library libvo-amrwbenc
+
+       Amazing Studio PAF Audio  :	@tab  X
+       Apple lossless audio    :   X  @tab  X
+	       @tab QuickTime fourcc 'alac'
+
+       aptX		       :   X  @tab  X
+	       @tab Used in Bluetooth A2DP
+
+       aptX HD		       :   X  @tab  X
+	       @tab Used in Bluetooth A2DP
+
+       ATRAC1		       :      @tab  X
+       ATRAC3		       :      @tab  X
+       ATRAC3+		       :      @tab  X
+       ATRAC9		       :      @tab  X
+       Bink Audio	       :      @tab  X
+	       @tab Used in Bink and Smacker files in many games.
+
+       Bonk audio	       :      @tab  X
+       CELT		       :      @tab  E
+	       @tab decoding supported through external library libcelt
+
+       codec2		       :   E  @tab  E
+	       @tab en/decoding supported through external library libcodec2
+
+       CRI HCA		       :      @tab X
+       Delphine Software International CIN audio   :	  @tab	X
+	       @tab Codec used in Delphine Software International games.
+
+       DFPWM		       :   X  @tab  X
+       Digital Speech Standard - Standard Play mode (DSS SP)  :      @tab  X
+       Discworld II BMV Audio  :      @tab  X
+       COOK		       :      @tab  X
+	       @tab All versions except 5.1 are supported.
+
+       DCA (DTS Coherent Acoustics)   :   X  @tab  X
+	       @tab supported extensions: XCh, XXCH, X96, XBR, XLL, LBR (partially)
+
+       Dolby E	 :	@tab  X
+       DPCM Cuberoot-Delta-Exact  :   @tab  X
+	       @tab Used in few games.
+
+       DPCM Gremlin	       :      @tab  X
+       DPCM id RoQ	       :   X  @tab  X
+	       @tab Used in Quake III, Jedi Knight 2 and other computer games.
+
+       DPCM Marble WADY        :      @tab  X
+       DPCM Interplay	       :      @tab  X
+	       @tab Used in various Interplay computer games.
+
+       DPCM Squareroot-Delta-Exact   :	 @tab  X
+	       @tab Used in various games.
+
+       DPCM Sierra Online      :      @tab  X
+	       @tab Used in Sierra Online game audio files.
+
+       DPCM Sol 	       :      @tab  X
+       DPCM Xan 	       :      @tab  X
+	       @tab Used in Origin's Wing Commander IV AVI files.
+
+       DPCM Xilam DERF	       :      @tab  X
+       DSD (Direct Stream Digital), least significant bit first   :   @tab  X
+       DSD (Direct Stream Digital), most significant bit first	  :   @tab  X
+       DSD (Direct Stream Digital), least significant bit first, planar   :
+       @tab  X
+       DSD (Direct Stream Digital), most significant bit first, planar	  :
+       @tab  X
+       DSP Group TrueSpeech    :      @tab  X
+       DST (Direct Stream Transfer)  :	 @tab  X
+       DV audio 	       :      @tab  X
+       Enhanced AC-3	       :   X  @tab  X
+       EVRC (Enhanced Variable Rate Codec)  :	   @tab  X
+       FLAC (Free Lossless Audio Codec)   :   X  @tab  IX
+       FTR Voice	       :      @tab  X
+       G.723.1		       :  X   @tab  X
+       G.729		       :      @tab  X
+       GSM		       :   E  @tab  X
+	       @tab encoding supported through external library libgsm
+
+       GSM Microsoft variant   :   E  @tab  X
+	       @tab encoding supported through external library libgsm
+
+       IAC (Indeo Audio Coder)	 :	@tab  X
+       iLBC (Internet Low Bitrate Codec)  :   E  @tab  EX
+	       @tab encoding and decoding supported through external library libilbc
+
+       IMC (Intel Music Coder)	 :	@tab  X
+       Interplay ACM		 :	@tab  X
+       MACE (Macintosh Audio Compression/Expansion) 3:1   :	 @tab  X
+       MACE (Macintosh Audio Compression/Expansion) 6:1   :	 @tab  X
+       Marian's A-pac audio	 :	@tab  X
+       MI-SC4 (Micronas SC-4 Audio)   :      @tab  X
+       MLP (Meridian Lossless Packing)	 :   X	@tab  X
+	       @tab Used in DVD-Audio discs.
+
+       Monkey's Audio	       :      @tab  X
+       MP1 (MPEG audio layer 1)   :	 @tab IX
+       MP2 (MPEG audio layer 2)   :  IX  @tab IX
+	       @tab encoding supported also through external library TwoLAME
+
+       MP3 (MPEG audio layer 3)   :   E  @tab IX
+	       @tab encoding supported through external library LAME, ADU MP3 and MP3onMP4 also supported
+
+       MPEG-4 Audio Lossless Coding (ALS)   :	   @tab  X
+       MobiClip FastAudio      :      @tab  X
+       Musepack SV7	       :      @tab  X
+       Musepack SV8	       :      @tab  X
+       Nellymoser Asao	       :   X  @tab  X
+       On2 AVC (Audio for Video Codec)	:      @tab  X
+       Opus		       :   E  @tab  X
+	       @tab encoding supported through external library libopus
+
+       OSQ (Original Sound Quality)   :      @tab  X
+       PCM A-law	       :   X  @tab  X
+       PCM mu-law	       :   X  @tab  X
+       PCM Archimedes VIDC     :   X  @tab  X
+       PCM signed 8-bit planar	 :   X	@tab  X
+       PCM signed 16-bit big-endian planar   :	 X  @tab  X
+       PCM signed 16-bit little-endian planar	:   X  @tab  X
+       PCM signed 24-bit little-endian planar	:   X  @tab  X
+       PCM signed 32-bit little-endian planar	:   X  @tab  X
+       PCM 32-bit floating point big-endian   :   X  @tab  X
+       PCM 32-bit floating point little-endian	 :   X	@tab  X
+       PCM 64-bit floating point big-endian   :   X  @tab  X
+       PCM 64-bit floating point little-endian	 :   X	@tab  X
+       PCM D-Cinema audio signed 24-bit    :   X  @tab	X
+       PCM signed 8-bit        :   X  @tab  X
+       PCM signed 16-bit big-endian   :   X  @tab  X
+       PCM signed 16-bit little-endian	 :   X	@tab  X
+       PCM signed 24-bit big-endian   :   X  @tab  X
+       PCM signed 24-bit little-endian	 :   X	@tab  X
+       PCM signed 32-bit big-endian   :   X  @tab  X
+       PCM signed 32-bit little-endian	 :   X	@tab  X
+       PCM signed 16/20/24-bit big-endian in MPEG-TS   :      @tab  X
+       PCM unsigned 8-bit      :   X  @tab  X
+       PCM unsigned 16-bit big-endian	:   X  @tab  X
+       PCM unsigned 16-bit little-endian   :   X  @tab	X
+       PCM unsigned 24-bit big-endian	:   X  @tab  X
+       PCM unsigned 24-bit little-endian   :   X  @tab	X
+       PCM unsigned 32-bit big-endian	:   X  @tab  X
+       PCM unsigned 32-bit little-endian   :   X  @tab	X
+       PCM SGA		       :      @tab  X
+       QCELP / PureVoice       :      @tab  X
+       QDesign Music Codec 1   :      @tab  X
+       QDesign Music Codec 2   :      @tab  X
+	       @tab There are still some distortions.
+
+       RealAudio 1.0 (14.4K)   :   X  @tab  X
+	       @tab Real 14400 bit/s codec
+
+       RealAudio 2.0 (28.8K)   :      @tab  X
+	       @tab Real 28800 bit/s codec
+
+       RealAudio 3.0 (dnet)    :  IX  @tab  X
+	       @tab Real low bitrate AC-3 codec
+
+       RealAudio Lossless      :      @tab  X
+       RealAudio SIPR / ACELP.NET  :	  @tab	X
+       RK Audio (RKA)	       :      @tab  X
+       SBC (low-complexity subband codec)  :   X  @tab	X
+	       @tab Used in Bluetooth A2DP
+
+       Shorten		       :      @tab  X
+       Sierra VMD audio        :      @tab  X
+	       @tab Used in Sierra VMD files.
+
+       Smacker audio	       :      @tab  X
+       SMPTE 302M AES3 audio   :   X  @tab  X
+       Sonic		       :   X  @tab  X
+	       @tab experimental codec
+
+       Sonic lossless	       :   X  @tab  X
+	       @tab experimental codec
+
+       Speex		       :   E  @tab  EX
+	       @tab supported through external library libspeex
+
+       TAK (Tom's lossless Audio Kompressor)   :      @tab  X
+       True Audio (TTA)        :   X  @tab  X
+       TrueHD		       :   X  @tab  X
+	       @tab Used in HD-DVD and Blu-Ray discs.
+
+       TwinVQ (VQF flavor)     :      @tab  X
+       VIMA		       :      @tab  X
+	       @tab Used in LucasArts SMUSH animations.
+
+       ViewQuest VQC	       :      @tab  X
+       Vorbis		       :   E  @tab  X
+	       @tab A native but very primitive encoder exists.
+
+       Voxware MetaSound       :      @tab  X
+       Waveform Archiver       :      @tab  X
+       WavPack		       :   X  @tab  X
+       Westwood Audio (SND1)   :      @tab  X
+       Windows Media Audio 1   :   X  @tab  X
+       Windows Media Audio 2   :   X  @tab  X
+       Windows Media Audio Lossless  :	 @tab  X
+       Windows Media Audio Pro	:     @tab  X
+       Windows Media Audio Voice  :   @tab  X
+       Xbox Media Audio 1      :      @tab  X
+       Xbox Media Audio 2      :      @tab  X
+
+       "X" means that the feature in that column (encoding / decoding) is
+       supported.
+
+       "E" means that support is provided through an external library.
+
+       "I" means that an integer-only version is available, too (ensures high
+       performance on systems without hardware floating point support).
+
+   Subtitle Formats
+       Name  :	Muxing @tab Demuxing @tab Encoding @tab Decoding
+       3GPP Timed Text	 :    @tab   @tab X @tab X
+       AQTitle		 :    @tab X @tab   @tab X
+       DVB		 :  X @tab X @tab X @tab X
+       DVB teletext	 :    @tab X @tab   @tab E
+       DVD		 :  X @tab X @tab X @tab X
+       JACOsub		 :  X @tab X @tab   @tab X
+       MicroDVD 	 :  X @tab X @tab   @tab X
+       MPL2		 :    @tab X @tab   @tab X
+       MPsub (MPlayer)	 :    @tab X @tab   @tab X
+       PGS		 :    @tab   @tab   @tab X
+       PJS (Phoenix)	 :    @tab X @tab   @tab X
+       RealText 	 :    @tab X @tab   @tab X
+       SAMI		 :    @tab X @tab   @tab X
+       Spruce format (STL)  :	 @tab X @tab   @tab X
+       SSA/ASS		 :  X @tab X @tab X @tab X
+       SubRip (SRT)	 :  X @tab X @tab X @tab X
+       SubViewer v1	 :    @tab X @tab   @tab X
+       SubViewer	 :    @tab X @tab   @tab X
+       TED Talks captions  :  @tab X @tab   @tab X
+       TTML		 :  X @tab   @tab X @tab
+       VobSub (IDX+SUB)  :    @tab X @tab   @tab X
+       VPlayer		 :    @tab X @tab   @tab X
+       WebVTT		 :  X @tab X @tab X @tab X
+       XSUB		 :    @tab   @tab X @tab X
+
+       "X" means that the feature is supported.
+
+       "E" means that support is provided through an external library.
+
+   Network Protocols
+       Name	     :	Support
+       AMQP	     :	E
+       file	     :	X
+       FTP	     :	X
+       Gopher	     :	X
+       Gophers	     :	X
+       HLS	     :	X
+       HTTP	     :	X
+       HTTPS	     :	X
+       Icecast	     :	X
+       MMSH	     :	X
+       MMST	     :	X
+       pipe	     :	X
+       Pro-MPEG FEC  :	X
+       RTMP	     :	X
+       RTMPE	     :	X
+       RTMPS	     :	X
+       RTMPT	     :	X
+       RTMPTE	     :	X
+       RTMPTS	     :	X
+       RTP	     :	X
+       SAMBA	     :	E
+       SCTP	     :	X
+       SFTP	     :	E
+       TCP	     :	X
+       TLS	     :	X
+       UDP	     :	X
+       ZMQ	     :	E
+
+       "X" means that the protocol is supported.
+
+       "E" means that support is provided through an external library.
+
+   Input/Output Devices
+       Name		  :  Input  @tab Output
+       ALSA		  :  X	    @tab X
+       BKTR		  :  X	    @tab
+       caca		  :	    @tab X
+       DV1394		  :  X	    @tab
+       Lavfi virtual device  :	X   @tab
+       Linux framebuffer  :  X	    @tab X
+       JACK		  :  X	    @tab
+       LIBCDIO		  :  X
+       LIBDC1394	  :  X	    @tab
+       OpenAL		  :  X
+       OpenGL		  :	    @tab X
+       OSS		  :  X	    @tab X
+       PulseAudio	  :  X	    @tab X
+       SDL		  :	    @tab X
+       Video4Linux2	  :  X	    @tab X
+       VfW capture	  :  X	    @tab
+       X11 grabbing	  :  X	    @tab
+       Win32 grabbing	  :  X	    @tab
+
+       "X" means that input/output is supported.
+
+   Timecode
+       Codec/format	  :  Read   @tab Write
+       AVI		  :  X	    @tab X
+       DV		  :  X	    @tab X
+       GXF		  :  X	    @tab X
+       MOV		  :  X	    @tab X
+       MPEG1/2		  :  X	    @tab X
+       MXF		  :  X	    @tab X
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), ffmpeg-utils(1), ffmpeg-scaler(1),
+       ffmpeg-resampler(1), ffmpeg-codecs(1), ffmpeg-bitstream-filters(1),
+       ffmpeg-formats(1), ffmpeg-devices(1), ffmpeg-protocols(1),
+       ffmpeg-filters(1)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+								 FFMPEG-ALL(1)
diff --git a/ffmpeg/manpages/ffmpeg-bitstream-filters.txt b/ffmpeg/manpages/ffmpeg-bitstream-filters.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a24c565538deb6454fbd679ec2630a4ebda1f36e
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-bitstream-filters.txt
@@ -0,0 +1,890 @@
+FFMPEG-BITSTREAM-FILTERS(1)			   FFMPEG-BITSTREAM-FILTERS(1)
+
+NAME
+       ffmpeg-bitstream-filters - FFmpeg bitstream filters
+
+DESCRIPTION
+       This document describes the bitstream filters provided by the
+       libavcodec library.
+
+       A bitstream filter operates on the encoded stream data, and performs
+       bitstream level modifications without performing decoding.
+
+BITSTREAM FILTERS
+       When you configure your FFmpeg build, all the supported bitstream
+       filters are enabled by default. You can list all available ones using
+       the configure option "--list-bsfs".
+
+       You can disable all the bitstream filters using the configure option
+       "--disable-bsfs", and selectively enable any bitstream filter using the
+       option "--enable-bsf=BSF", or you can disable a particular bitstream
+       filter using the option "--disable-bsf=BSF".
+
+       The option "-bsfs" of the ff* tools will display the list of all the
+       supported bitstream filters included in your build.
+
+       The ff* tools have a -bsf option applied per stream, taking a comma-
+       separated list of filters, whose parameters follow the filter name
+       after a '='.
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v filter1[=opt1=str1:opt2=str2][,filter2] OUTPUT
+
+       Below is a description of the currently available bitstream filters,
+       with their parameters, if any.
+
+   aac_adtstoasc
+       Convert MPEG-2/4 AAC ADTS to an MPEG-4 Audio Specific Configuration
+       bitstream.
+
+       This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4 ADTS
+       header and removes the ADTS header.
+
+       This filter is required for example when copying an AAC stream from a
+       raw ADTS AAC or an MPEG-TS container to MP4A-LATM, to an FLV file, or
+       to MOV/MP4 files and related formats such as 3GP or M4A. Please note
+       that it is auto-inserted for MP4A-LATM and MOV/MP4 and related formats.
+
+   av1_metadata
+       Modify metadata embedded in an AV1 stream.
+
+       td  Insert or remove temporal delimiter OBUs in all temporal units of
+	   the stream.
+
+	   insert
+	       Insert a TD at the beginning of every TU which does not already
+	       have one.
+
+	   remove
+	       Remove the TD from the beginning of every TU which has one.
+
+       color_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the color description fields in the stream (see AV1 section
+	   6.4.2).
+
+       color_range
+	   Set the color range in the stream (see AV1 section 6.4.2; note that
+	   this cannot be set for streams using BT.709 primaries, sRGB
+	   transfer characteristic and identity (RGB) matrix coefficients).
+
+	   tv  Limited range.
+
+	   pc  Full range.
+
+       chroma_sample_position
+	   Set the chroma sample location in the stream (see AV1 section
+	   6.4.2).  This can only be set for 4:2:0 streams.
+
+	   vertical
+	       Left position (matching the default in MPEG-2 and H.264).
+
+	   colocated
+	       Top-left position.
+
+       tick_rate
+	   Set the tick rate (time_scale / num_units_in_display_tick) in the
+	   timing info in the sequence header.
+
+       num_ticks_per_picture
+	   Set the number of ticks in each picture, to indicate that the
+	   stream has a fixed framerate.  Ignored if tick_rate is not also
+	   set.
+
+       delete_padding
+	   Deletes Padding OBUs.
+
+   chomp
+       Remove zero padding at the end of a packet.
+
+   dca_core
+       Extract the core from a DCA/DTS stream, dropping extensions such as
+       DTS-HD.
+
+   dump_extra
+       Add extradata to the beginning of the filtered packets except when said
+       packets already exactly begin with the extradata that is intended to be
+       added.
+
+       freq
+	   The additional argument specifies which packets should be filtered.
+	   It accepts the values:
+
+	   k
+	   keyframe
+	       add extradata to all key packets
+
+	   e
+	   all add extradata to all packets
+
+       If not specified it is assumed k.
+
+       For example the following ffmpeg command forces a global header (thus
+       disabling individual packet headers) in the H.264 packets generated by
+       the "libx264" encoder, but corrects them by adding the header stored in
+       extradata to the key packets:
+
+	       ffmpeg -i INPUT -map 0 -flags:v +global_header -c:v libx264 -bsf:v dump_extra out.ts
+
+   dv_error_marker
+       Blocks in DV which are marked as damaged are replaced by blocks of the
+       specified color.
+
+       color
+	   The color to replace damaged blocks by
+
+       sta A 16 bit mask which specifies which of the 16 possible error status
+	   values are to be replaced by colored blocks. 0xFFFE is the default
+	   which replaces all non 0 error status values.
+
+	   ok  No error, no concealment
+
+	   err Error, No concealment
+
+	   res Reserved
+
+	   notok
+	       Error or concealment
+
+	   notres
+	       Not reserved
+
+	   Aa, Ba, Ca, Ab, Bb, Cb, A, B, C, a, b, erri, erru
+	       The specific error status code
+
+	   see page 44-46 or section 5.5 of
+	   <http://web.archive.org/web/20060927044735/http://www.smpte.org/smpte_store/standards/pdf/s314m.pdf>
+
+   eac3_core
+       Extract the core from a E-AC-3 stream, dropping extra channels.
+
+   extract_extradata
+       Extract the in-band extradata.
+
+       Certain codecs allow the long-term headers (e.g. MPEG-2 sequence
+       headers, or H.264/HEVC (VPS/)SPS/PPS) to be transmitted either "in-
+       band" (i.e. as a part of the bitstream containing the coded frames) or
+       "out of band" (e.g. on the container level). This latter form is called
+       "extradata" in FFmpeg terminology.
+
+       This bitstream filter detects the in-band headers and makes them
+       available as extradata.
+
+       remove
+	   When this option is enabled, the long-term headers are removed from
+	   the bitstream after extraction.
+
+   filter_units
+       Remove units with types in or not in a given set from the stream.
+
+       pass_types
+	   List of unit types or ranges of unit types to pass through while
+	   removing all others.  This is specified as a '|'-separated list of
+	   unit type values or ranges of values with '-'.
+
+       remove_types
+	   Identical to pass_types, except the units in the given set removed
+	   and all others passed through.
+
+       The types used by pass_types and remove_types correspond to NAL unit
+       types (nal_unit_type) in H.264, HEVC and H.266 (see Table 7-1 in the
+       H.264 and HEVC specifications or Table 5 in the H.266 specification),
+       to marker values for JPEG (without 0xFF prefix) and to start codes
+       without start code prefix (i.e. the byte following the 0x000001) for
+       MPEG-2.	For VP8 and VP9, every unit has type zero.
+
+       Extradata is unchanged by this transformation, but note that if the
+       stream contains inline parameter sets then the output may be unusable
+       if they are removed.
+
+       For example, to remove all non-VCL NAL units from an H.264 stream:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=pass_types=1-5' OUTPUT
+
+       To remove all AUDs, SEI and filler from an H.265 stream:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=35|38-40' OUTPUT
+
+       To remove all user data from a MPEG-2 stream, including Closed
+       Captions:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=178' OUTPUT
+
+       To remove all SEI from a H264 stream, including Closed Captions:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=6' OUTPUT
+
+       To remove all prefix and suffix SEI from a HEVC stream, including
+       Closed Captions and dynamic HDR:
+
+	       ffmpeg -i INPUT -c:v copy -bsf:v 'filter_units=remove_types=39|40' OUTPUT
+
+   hapqa_extract
+       Extract Rgb or Alpha part of an HAPQA file, without recompression, in
+       order to create an HAPQ or an HAPAlphaOnly file.
+
+       texture
+	   Specifies the texture to keep.
+
+	   color
+	   alpha
+
+       Convert HAPQA to HAPQ
+
+	       ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=color -tag:v HapY -metadata:s:v:0 encoder="HAPQ" hapq_file.mov
+
+       Convert HAPQA to HAPAlphaOnly
+
+	       ffmpeg -i hapqa_inputfile.mov -c copy -bsf:v hapqa_extract=texture=alpha -tag:v HapA -metadata:s:v:0 encoder="HAPAlpha Only" hapalphaonly_file.mov
+
+   h264_metadata
+       Modify metadata embedded in an H.264 stream.
+
+       aud Insert or remove AUD NAL units in all access units of the stream.
+
+	   pass
+	   insert
+	   remove
+
+	   Default is pass.
+
+       sample_aspect_ratio
+	   Set the sample aspect ratio of the stream in the VUI parameters.
+	   See H.264 table E-1.
+
+       overscan_appropriate_flag
+	   Set whether the stream is suitable for display using overscan or
+	   not (see H.264 section E.2.1).
+
+       video_format
+       video_full_range_flag
+	   Set the video format in the stream (see H.264 section E.2.1 and
+	   table E-2).
+
+       colour_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the colour description in the stream (see H.264 section E.2.1
+	   and tables E-3, E-4 and E-5).
+
+       chroma_sample_loc_type
+	   Set the chroma sample location in the stream (see H.264 section
+	   E.2.1 and figure E-1).
+
+       tick_rate
+	   Set the tick rate (time_scale / num_units_in_tick) in the VUI
+	   parameters.	This is the smallest time unit representable in the
+	   stream, and in many cases represents the field rate of the stream
+	   (double the frame rate).
+
+       fixed_frame_rate_flag
+	   Set whether the stream has fixed framerate - typically this
+	   indicates that the framerate is exactly half the tick rate, but the
+	   exact meaning is dependent on interlacing and the picture structure
+	   (see H.264 section E.2.1 and table E-6).
+
+       zero_new_constraint_set_flags
+	   Zero constraint_set4_flag and constraint_set5_flag in the SPS.
+	   These bits were reserved in a previous version of the H.264 spec,
+	   and thus some hardware decoders require these to be zero. The
+	   result of zeroing this is still a valid bitstream.
+
+       crop_left
+       crop_right
+       crop_top
+       crop_bottom
+	   Set the frame cropping offsets in the SPS.  These values will
+	   replace the current ones if the stream is already cropped.
+
+	   These fields are set in pixels.  Note that some sizes may not be
+	   representable if the chroma is subsampled or the stream is
+	   interlaced (see H.264 section 7.4.2.1.1).
+
+       sei_user_data
+	   Insert a string as SEI unregistered user data.  The argument must
+	   be of the form UUID+string, where the UUID is as hex digits
+	   possibly separated by hyphens, and the string can be anything.
+
+	   For example, 086f3693-b7b3-4f2c-9653-21492feee5b8+hello will insert
+	   the string ``hello'' associated with the given UUID.
+
+       delete_filler
+	   Deletes both filler NAL units and filler SEI messages.
+
+       display_orientation
+	   Insert, extract or remove Display orientation SEI messages.	See
+	   H.264 section D.1.27 and D.2.27 for syntax and semantics.
+
+	   pass
+	   insert
+	   remove
+	   extract
+
+	   Default is pass.
+
+	   Insert mode works in conjunction with "rotate" and "flip" options.
+	   Any pre-existing Display orientation messages will be removed in
+	   insert or remove mode.  Extract mode attaches the display matrix to
+	   the packet as side data.
+
+       rotate
+	   Set rotation in display orientation SEI (anticlockwise angle in
+	   degrees).  Range is -360 to +360. Default is NaN.
+
+       flip
+	   Set flip in display orientation SEI.
+
+	   horizontal
+	   vertical
+
+	   Default is unset.
+
+       level
+	   Set the level in the SPS.  Refer to H.264 section A.3 and tables
+	   A-1 to A-5.
+
+	   The argument must be the name of a level (for example, 4.2), a
+	   level_idc value (for example, 42), or the special name auto
+	   indicating that the filter should attempt to guess the level from
+	   the input stream properties.
+
+   h264_mp4toannexb
+       Convert an H.264 bitstream from length prefixed mode to start code
+       prefixed mode (as defined in the Annex B of the ITU-T H.264
+       specification).
+
+       This is required by some streaming formats, typically the MPEG-2
+       transport stream format (muxer "mpegts").
+
+       For example to remux an MP4 file containing an H.264 stream to mpegts
+       format with ffmpeg, you can use the command:
+
+	       ffmpeg -i INPUT.mp4 -codec copy -bsf:v h264_mp4toannexb OUTPUT.ts
+
+       Please note that this filter is auto-inserted for MPEG-TS (muxer
+       "mpegts") and raw H.264 (muxer "h264") output formats.
+
+   h264_redundant_pps
+       This applies a specific fixup to some Blu-ray streams which contain
+       redundant PPSs modifying irrelevant parameters of the stream which
+       confuse other transformations which require correct extradata.
+
+   hevc_metadata
+       Modify metadata embedded in an HEVC stream.
+
+       aud Insert or remove AUD NAL units in all access units of the stream.
+
+	   insert
+	   remove
+       sample_aspect_ratio
+	   Set the sample aspect ratio in the stream in the VUI parameters.
+
+       video_format
+       video_full_range_flag
+	   Set the video format in the stream (see H.265 section E.3.1 and
+	   table E.2).
+
+       colour_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the colour description in the stream (see H.265 section E.3.1
+	   and tables E.3, E.4 and E.5).
+
+       chroma_sample_loc_type
+	   Set the chroma sample location in the stream (see H.265 section
+	   E.3.1 and figure E.1).
+
+       tick_rate
+	   Set the tick rate in the VPS and VUI parameters (time_scale /
+	   num_units_in_tick). Combined with num_ticks_poc_diff_one, this can
+	   set a constant framerate in the stream.  Note that it is likely to
+	   be overridden by container parameters when the stream is in a
+	   container.
+
+       num_ticks_poc_diff_one
+	   Set poc_proportional_to_timing_flag in VPS and VUI and use this
+	   value to set num_ticks_poc_diff_one_minus1 (see H.265 sections
+	   7.4.3.1 and E.3.1).	Ignored if tick_rate is not also set.
+
+       crop_left
+       crop_right
+       crop_top
+       crop_bottom
+	   Set the conformance window cropping offsets in the SPS.  These
+	   values will replace the current ones if the stream is already
+	   cropped.
+
+	   These fields are set in pixels.  Note that some sizes may not be
+	   representable if the chroma is subsampled (H.265 section
+	   7.4.3.2.1).
+
+       level
+	   Set the level in the VPS and SPS.  See H.265 section A.4 and tables
+	   A.6 and A.7.
+
+	   The argument must be the name of a level (for example, 5.1), a
+	   general_level_idc value (for example, 153 for level 5.1), or the
+	   special name auto indicating that the filter should attempt to
+	   guess the level from the input stream properties.
+
+   hevc_mp4toannexb
+       Convert an HEVC/H.265 bitstream from length prefixed mode to start code
+       prefixed mode (as defined in the Annex B of the ITU-T H.265
+       specification).
+
+       This is required by some streaming formats, typically the MPEG-2
+       transport stream format (muxer "mpegts").
+
+       For example to remux an MP4 file containing an HEVC stream to mpegts
+       format with ffmpeg, you can use the command:
+
+	       ffmpeg -i INPUT.mp4 -codec copy -bsf:v hevc_mp4toannexb OUTPUT.ts
+
+       Please note that this filter is auto-inserted for MPEG-TS (muxer
+       "mpegts") and raw HEVC/H.265 (muxer "h265" or "hevc") output formats.
+
+   imxdump
+       Modifies the bitstream to fit in MOV and to be usable by the Final Cut
+       Pro decoder. This filter only applies to the mpeg2video codec, and is
+       likely not needed for Final Cut Pro 7 and newer with the appropriate
+       -tag:v.
+
+       For example, to remux 30 MB/sec NTSC IMX to MOV:
+
+	       ffmpeg -i input.mxf -c copy -bsf:v imxdump -tag:v mx3n output.mov
+
+   mjpeg2jpeg
+       Convert MJPEG/AVI1 packets to full JPEG/JFIF packets.
+
+       MJPEG is a video codec wherein each video frame is essentially a JPEG
+       image. The individual frames can be extracted without loss, e.g. by
+
+	       ffmpeg -i ../some_mjpeg.avi -c:v copy frames_%d.jpg
+
+       Unfortunately, these chunks are incomplete JPEG images, because they
+       lack the DHT segment required for decoding. Quoting from
+       <http://www.digitalpreservation.gov/formats/fdd/fdd000063.shtml>:
+
+       Avery Lee, writing in the rec.video.desktop newsgroup in 2001,
+       commented that "MJPEG, or at least the MJPEG in AVIs having the MJPG
+       fourcc, is restricted JPEG with a fixed -- and *omitted* -- Huffman
+       table. The JPEG must be YCbCr colorspace, it must be 4:2:2, and it must
+       use basic Huffman encoding, not arithmetic or progressive. . . . You
+       can indeed extract the MJPEG frames and decode them with a regular JPEG
+       decoder, but you have to prepend the DHT segment to them, or else the
+       decoder won't have any idea how to decompress the data. The exact table
+       necessary is given in the OpenDML spec."
+
+       This bitstream filter patches the header of frames extracted from an
+       MJPEG stream (carrying the AVI1 header ID and lacking a DHT segment) to
+       produce fully qualified JPEG images.
+
+	       ffmpeg -i mjpeg-movie.avi -c:v copy -bsf:v mjpeg2jpeg frame_%d.jpg
+	       exiftran -i -9 frame*.jpg
+	       ffmpeg -i frame_%d.jpg -c:v copy rotated.avi
+
+   mjpegadump
+       Add an MJPEG A header to the bitstream, to enable decoding by
+       Quicktime.
+
+   mov2textsub
+       Extract a representable text file from MOV subtitles, stripping the
+       metadata header from each subtitle packet.
+
+       See also the text2movsub filter.
+
+   mpeg2_metadata
+       Modify metadata embedded in an MPEG-2 stream.
+
+       display_aspect_ratio
+	   Set the display aspect ratio in the stream.
+
+	   The following fixed values are supported:
+
+	   4/3
+	   16/9
+	   221/100
+
+	   Any other value will result in square pixels being signalled
+	   instead (see H.262 section 6.3.3 and table 6-3).
+
+       frame_rate
+	   Set the frame rate in the stream.  This is constructed from a table
+	   of known values combined with a small multiplier and divisor - if
+	   the supplied value is not exactly representable, the nearest
+	   representable value will be used instead (see H.262 section 6.3.3
+	   and table 6-4).
+
+       video_format
+	   Set the video format in the stream (see H.262 section 6.3.6 and
+	   table 6-6).
+
+       colour_primaries
+       transfer_characteristics
+       matrix_coefficients
+	   Set the colour description in the stream (see H.262 section 6.3.6
+	   and tables 6-7, 6-8 and 6-9).
+
+   mpeg4_unpack_bframes
+       Unpack DivX-style packed B-frames.
+
+       DivX-style packed B-frames are not valid MPEG-4 and were only a
+       workaround for the broken Video for Windows subsystem.  They use more
+       space, can cause minor AV sync issues, require more CPU power to decode
+       (unless the player has some decoded picture queue to compensate the
+       2,0,2,0 frame per packet style) and cause trouble if copied into a
+       standard container like mp4 or mpeg-ps/ts, because MPEG-4 decoders may
+       not be able to decode them, since they are not valid MPEG-4.
+
+       For example to fix an AVI file containing an MPEG-4 stream with DivX-
+       style packed B-frames using ffmpeg, you can use the command:
+
+	       ffmpeg -i INPUT.avi -codec copy -bsf:v mpeg4_unpack_bframes OUTPUT.avi
+
+   noise
+       Damages the contents of packets or simply drops them without damaging
+       the container. Can be used for fuzzing or testing error
+       resilience/concealment.
+
+       Parameters:
+
+       amount
+	   Accepts an expression whose evaluation per-packet determines how
+	   often bytes in that packet will be modified. A value below 0 will
+	   result in a variable frequency.  Default is 0 which results in no
+	   modification. However, if neither amount nor drop is specified,
+	   amount will be set to -1. See below for accepted variables.
+
+       drop
+	   Accepts an expression evaluated per-packet whose value determines
+	   whether that packet is dropped.  Evaluation to a positive value
+	   results in the packet being dropped. Evaluation to a negative value
+	   results in a variable chance of it being dropped, roughly inverse
+	   in proportion to the magnitude of the value. Default is 0 which
+	   results in no drops. See below for accepted variables.
+
+       dropamount
+	   Accepts a non-negative integer, which assigns a variable chance of
+	   it being dropped, roughly inverse in proportion to the value.
+	   Default is 0 which results in no drops. This option is kept for
+	   backwards compatibility and is equivalent to setting drop to a
+	   negative value with the same magnitude i.e. "dropamount=4" is the
+	   same as "drop=-4". Ignored if drop is also specified.
+
+       Both "amount" and "drop" accept expressions containing the following
+       variables:
+
+       n   The index of the packet, starting from zero.
+
+       tb  The timebase for packet timestamps.
+
+       pts Packet presentation timestamp.
+
+       dts Packet decoding timestamp.
+
+       nopts
+	   Constant representing AV_NOPTS_VALUE.
+
+       startpts
+	   First non-AV_NOPTS_VALUE PTS seen in the stream.
+
+       startdts
+	   First non-AV_NOPTS_VALUE DTS seen in the stream.
+
+       duration
+       d   Packet duration, in timebase units.
+
+       pos Packet position in input; may be -1 when unknown or not set.
+
+       size
+	   Packet size, in bytes.
+
+       key Whether packet is marked as a keyframe.
+
+       state
+	   A pseudo random integer, primarily derived from the content of
+	   packet payload.
+
+       Examples
+
+       Apply modification to every byte but don't drop any packets.
+
+	       ffmpeg -i INPUT -c copy -bsf noise=1 output.mkv
+
+       Drop every video packet not marked as a keyframe after timestamp 30s
+       but do not modify any of the remaining packets.
+
+	       ffmpeg -i INPUT -c copy -bsf:v noise=drop='gt(t\,30)*not(key)' output.mkv
+
+       Drop one second of audio every 10 seconds and add some random noise to
+       the rest.
+
+	       ffmpeg -i INPUT -c copy -bsf:a noise=amount=-1:drop='between(mod(t\,10)\,9\,10)' output.mkv
+
+   null
+       This bitstream filter passes the packets through unchanged.
+
+   pcm_rechunk
+       Repacketize PCM audio to a fixed number of samples per packet or a
+       fixed packet rate per second. This is similar to the asetnsamples audio
+       filter but works on audio packets instead of audio frames.
+
+       nb_out_samples, n
+	   Set the number of samples per each output audio packet. The number
+	   is intended as the number of samples per each channel. Default
+	   value is 1024.
+
+       pad, p
+	   If set to 1, the filter will pad the last audio packet with
+	   silence, so that it will contain the same number of samples (or
+	   roughly the same number of samples, see frame_rate) as the previous
+	   ones. Default value is 1.
+
+       frame_rate, r
+	   This option makes the filter output a fixed number of packets per
+	   second instead of a fixed number of samples per packet. If the
+	   audio sample rate is not divisible by the frame rate then the
+	   number of samples will not be constant but will vary slightly so
+	   that each packet will start as close to the frame boundary as
+	   possible. Using this option has precedence over nb_out_samples.
+
+       You can generate the well known 1602-1601-1602-1601-1602 pattern of
+       48kHz audio for NTSC frame rate using the frame_rate option.
+
+	       ffmpeg -f lavfi -i sine=r=48000:d=1 -c pcm_s16le -bsf pcm_rechunk=r=30000/1001 -f framecrc -
+
+   pgs_frame_merge
+       Merge a sequence of PGS Subtitle segments ending with an "end of
+       display set" segment into a single packet.
+
+       This is required by some containers that support PGS subtitles (muxer
+       "matroska").
+
+   prores_metadata
+       Modify color property metadata embedded in prores stream.
+
+       color_primaries
+	   Set the color primaries.  Available values are:
+
+	   auto
+	       Keep the same color primaries property (default).
+
+	   unknown
+	   bt709
+	   bt470bg
+	       BT601 625
+
+	   smpte170m
+	       BT601 525
+
+	   bt2020
+	   smpte431
+	       DCI P3
+
+	   smpte432
+	       P3 D65
+
+       transfer_characteristics
+	   Set the color transfer.  Available values are:
+
+	   auto
+	       Keep the same transfer characteristics property (default).
+
+	   unknown
+	   bt709
+	       BT 601, BT 709, BT 2020
+
+	   smpte2084
+	       SMPTE ST 2084
+
+	   arib-std-b67
+	       ARIB STD-B67
+
+       matrix_coefficients
+	   Set the matrix coefficient.	Available values are:
+
+	   auto
+	       Keep the same colorspace property (default).
+
+	   unknown
+	   bt709
+	   smpte170m
+	       BT 601
+
+	   bt2020nc
+
+       Set Rec709 colorspace for each frame of the file
+
+	       ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709 output.mov
+
+       Set Hybrid Log-Gamma parameters for each frame of the file
+
+	       ffmpeg -i INPUT -c copy -bsf:v prores_metadata=color_primaries=bt2020:color_trc=arib-std-b67:colorspace=bt2020nc output.mov
+
+   remove_extra
+       Remove extradata from packets.
+
+       It accepts the following parameter:
+
+       freq
+	   Set which frame types to remove extradata from.
+
+	   k   Remove extradata from non-keyframes only.
+
+	   keyframe
+	       Remove extradata from keyframes only.
+
+	   e, all
+	       Remove extradata from all frames.
+
+   setts
+       Set PTS and DTS in packets.
+
+       It accepts the following parameters:
+
+       ts
+       pts
+       dts Set expressions for PTS, DTS or both.
+
+       duration
+	   Set expression for duration.
+
+       time_base
+	   Set output time base.
+
+       The expressions are evaluated through the eval API and can contain the
+       following constants:
+
+       N   The count of the input packet. Starting from 0.
+
+       TS  The demux timestamp in input in case of "ts" or "dts" option or
+	   presentation timestamp in case of "pts" option.
+
+       POS The original position in the file of the packet, or undefined if
+	   undefined for the current packet
+
+       DTS The demux timestamp in input.
+
+       PTS The presentation timestamp in input.
+
+       DURATION
+	   The duration in input.
+
+       STARTDTS
+	   The DTS of the first packet.
+
+       STARTPTS
+	   The PTS of the first packet.
+
+       PREV_INDTS
+	   The previous input DTS.
+
+       PREV_INPTS
+	   The previous input PTS.
+
+       PREV_INDURATION
+	   The previous input duration.
+
+       PREV_OUTDTS
+	   The previous output DTS.
+
+       PREV_OUTPTS
+	   The previous output PTS.
+
+       PREV_OUTDURATION
+	   The previous output duration.
+
+       NEXT_DTS
+	   The next input DTS.
+
+       NEXT_PTS
+	   The next input PTS.
+
+       NEXT_DURATION
+	   The next input duration.
+
+       TB  The timebase of stream packet belongs.
+
+       TB_OUT
+	   The output timebase.
+
+       SR  The sample rate of stream packet belongs.
+
+       NOPTS
+	   The AV_NOPTS_VALUE constant.
+
+       For example, to set PTS equal to DTS (not recommended if B-frames are
+       involved):
+
+	       ffmpeg -i INPUT -c:a copy -bsf:a setts=pts=DTS out.mkv
+
+   showinfo
+       Log basic packet information. Mainly useful for testing, debugging, and
+       development.
+
+   text2movsub
+       Convert text subtitles to MOV subtitles (as used by the "mov_text"
+       codec) with metadata headers.
+
+       See also the mov2textsub filter.
+
+   trace_headers
+       Log trace output containing all syntax elements in the coded stream
+       headers (everything above the level of individual coded blocks).  This
+       can be useful for debugging low-level stream issues.
+
+       Supports AV1, H.264, H.265, (M)JPEG, MPEG-2 and VP9, but depending on
+       the build only a subset of these may be available.
+
+   truehd_core
+       Extract the core from a TrueHD stream, dropping ATMOS data.
+
+   vp9_metadata
+       Modify metadata embedded in a VP9 stream.
+
+       color_space
+	   Set the color space value in the frame header.  Note that any frame
+	   set to RGB will be implicitly set to PC range and that RGB is
+	   incompatible with profiles 0 and 2.
+
+	   unknown
+	   bt601
+	   bt709
+	   smpte170
+	   smpte240
+	   bt2020
+	   rgb
+       color_range
+	   Set the color range value in the frame header.  Note that any value
+	   imposed by the color space will take precedence over this value.
+
+	   tv
+	   pc
+
+   vp9_superframe
+       Merge VP9 invisible (alt-ref) frames back into VP9 superframes. This
+       fixes merging of split/segmented VP9 streams where the alt-ref frame
+       was split from its visible counterpart.
+
+   vp9_superframe_split
+       Split VP9 superframes into single frames.
+
+   vp9_raw_reorder
+       Given a VP9 stream with correct timestamps but possibly out of order,
+       insert additional show-existing-frame packets to correct the ordering.
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libavcodec(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+						   FFMPEG-BITSTREAM-FILTERS(1)
diff --git a/ffmpeg/manpages/ffmpeg-codecs.txt b/ffmpeg/manpages/ffmpeg-codecs.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3027474fd0cd29b0ea091dcddd1ac568c1a6ec3d
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-codecs.txt
@@ -0,0 +1,5686 @@
+FFMPEG-CODECS(1)					      FFMPEG-CODECS(1)
+
+NAME
+       ffmpeg-codecs - FFmpeg codecs
+
+DESCRIPTION
+       This document describes the codecs (decoders and encoders) provided by
+       the libavcodec library.
+
+CODEC OPTIONS
+       libavcodec provides some generic global options, which can be set on
+       all the encoders and decoders. In addition, each codec may support so-
+       called private options, which are specific for a given codec.
+
+       Sometimes, a global option may only affect a specific kind of codec,
+       and may be nonsensical or ignored by another, so you need to be aware
+       of the meaning of the specified options. Also some options are meant
+       only for decoding or encoding.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the "AVCodecContext" options or
+       using the libavutil/opt.h API for programmatic use.
+
+       The list of supported options follow:
+
+       b integer (encoding,audio,video)
+	   Set bitrate in bits/s. Default value is 200K.
+
+       ab integer (encoding,audio)
+	   Set audio bitrate (in bits/s). Default value is 128K.
+
+       bt integer (encoding,video)
+	   Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate
+	   tolerance specifies how far ratecontrol is willing to deviate from
+	   the target average bitrate value. This is not related to min/max
+	   bitrate. Lowering tolerance too much has an adverse effect on
+	   quality.
+
+       flags flags (decoding/encoding,audio,video,subtitles)
+	   Set generic flags.
+
+	   Possible values:
+
+	   mv4 Use four motion vector by macroblock (mpeg4).
+
+	   qpel
+	       Use 1/4 pel motion compensation.
+
+	   loop
+	       Use loop filter.
+
+	   qscale
+	       Use fixed qscale.
+
+	   pass1
+	       Use internal 2pass ratecontrol in first pass mode.
+
+	   pass2
+	       Use internal 2pass ratecontrol in second pass mode.
+
+	   gray
+	       Only decode/encode grayscale.
+
+	   psnr
+	       Set error[?] variables during encoding.
+
+	   truncated
+	       Input bitstream might be randomly truncated.
+
+	   drop_changed
+	       Don't output frames whose parameters differ from first decoded
+	       frame in stream.  Error AVERROR_INPUT_CHANGED is returned when
+	       a frame is dropped.
+
+	   ildct
+	       Use interlaced DCT.
+
+	   low_delay
+	       Force low delay.
+
+	   global_header
+	       Place global headers in extradata instead of every keyframe.
+
+	   bitexact
+	       Only write platform-, build- and time-independent data. (except
+	       (I)DCT).  This ensures that file and data checksums are
+	       reproducible and match between platforms. Its primary use is
+	       for regression testing.
+
+	   aic Apply H263 advanced intra coding / mpeg4 ac prediction.
+
+	   ilme
+	       Apply interlaced motion estimation.
+
+	   cgop
+	       Use closed gop.
+
+	   output_corrupt
+	       Output even potentially corrupted frames.
+
+       time_base rational number
+	   Set codec time base.
+
+	   It is the fundamental unit of time (in seconds) in terms of which
+	   frame timestamps are represented. For fixed-fps content, timebase
+	   should be "1 / frame_rate" and timestamp increments should be
+	   identically 1.
+
+       g integer (encoding,video)
+	   Set the group of picture (GOP) size. Default value is 12.
+
+       ar integer (decoding/encoding,audio)
+	   Set audio sampling rate (in Hz).
+
+       ac integer (decoding/encoding,audio)
+	   Set number of audio channels.
+
+       cutoff integer (encoding,audio)
+	   Set cutoff bandwidth. (Supported only by selected encoders, see
+	   their respective documentation sections.)
+
+       frame_size integer (encoding,audio)
+	   Set audio frame size.
+
+	   Each submitted frame except the last must contain exactly
+	   frame_size samples per channel. May be 0 when the codec has
+	   CODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is
+	   not restricted. It is set by some decoders to indicate constant
+	   frame size.
+
+       frame_number integer
+	   Set the frame number.
+
+       delay integer
+       qcomp float (encoding,video)
+	   Set video quantizer scale compression (VBR). It is used as a
+	   constant in the ratecontrol equation. Recommended range for default
+	   rc_eq: 0.0-1.0.
+
+       qblur float (encoding,video)
+	   Set video quantizer scale blur (VBR).
+
+       qmin integer (encoding,video)
+	   Set min video quantizer scale (VBR). Must be included between -1
+	   and 69, default value is 2.
+
+       qmax integer (encoding,video)
+	   Set max video quantizer scale (VBR). Must be included between -1
+	   and 1024, default value is 31.
+
+       qdiff integer (encoding,video)
+	   Set max difference between the quantizer scale (VBR).
+
+       bf integer (encoding,video)
+	   Set max number of B frames between non-B-frames.
+
+	   Must be an integer between -1 and 16. 0 means that B-frames are
+	   disabled. If a value of -1 is used, it will choose an automatic
+	   value depending on the encoder.
+
+	   Default value is 0.
+
+       b_qfactor float (encoding,video)
+	   Set qp factor between P and B frames.
+
+       codec_tag integer
+       bug flags (decoding,video)
+	   Workaround not auto detected encoder bugs.
+
+	   Possible values:
+
+	   autodetect
+	   xvid_ilace
+	       Xvid interlacing bug (autodetected if fourcc==XVIX)
+
+	   ump4
+	       (autodetected if fourcc==UMP4)
+
+	   no_padding
+	       padding bug (autodetected)
+
+	   amv
+	   qpel_chroma
+	   std_qpel
+	       old standard qpel (autodetected per fourcc/version)
+
+	   qpel_chroma2
+	   direct_blocksize
+	       direct-qpel-blocksize bug (autodetected per fourcc/version)
+
+	   edge
+	       edge padding bug (autodetected per fourcc/version)
+
+	   hpel_chroma
+	   dc_clip
+	   ms  Workaround various bugs in microsoft broken decoders.
+
+	   trunc
+	       trancated frames
+
+       strict integer (decoding/encoding,audio,video)
+	   Specify how strictly to follow the standards.
+
+	   Possible values:
+
+	   very
+	       strictly conform to an older more strict version of the spec or
+	       reference software
+
+	   strict
+	       strictly conform to all the things in the spec no matter what
+	       consequences
+
+	   normal
+	   unofficial
+	       allow unofficial extensions
+
+	   experimental
+	       allow non standardized experimental things, experimental
+	       (unfinished/work in progress/not well tested) decoders and
+	       encoders.  Note: experimental decoders can pose a security
+	       risk, do not use this for decoding untrusted input.
+
+       b_qoffset float (encoding,video)
+	   Set QP offset between P and B frames.
+
+       err_detect flags (decoding,audio,video)
+	   Set error detection flags.
+
+	   Possible values:
+
+	   crccheck
+	       verify embedded CRCs
+
+	   bitstream
+	       detect bitstream specification deviations
+
+	   buffer
+	       detect improper bitstream length
+
+	   explode
+	       abort decoding on minor error detection
+
+	   ignore_err
+	       ignore decoding errors, and continue decoding.  This is useful
+	       if you want to analyze the content of a video and thus want
+	       everything to be decoded no matter what. This option will not
+	       result in a video that is pleasing to watch in case of errors.
+
+	   careful
+	       consider things that violate the spec and have not been seen in
+	       the wild as errors
+
+	   compliant
+	       consider all spec non compliancies as errors
+
+	   aggressive
+	       consider things that a sane encoder should not do as an error
+
+       has_b_frames integer
+       block_align integer
+       rc_override_count integer
+       maxrate integer (encoding,audio,video)
+	   Set max bitrate tolerance (in bits/s). Requires bufsize to be set.
+
+       minrate integer (encoding,audio,video)
+	   Set min bitrate tolerance (in bits/s). Most useful in setting up a
+	   CBR encode. It is of little use elsewise.
+
+       bufsize integer (encoding,audio,video)
+	   Set ratecontrol buffer size (in bits).
+
+       i_qfactor float (encoding,video)
+	   Set QP factor between P and I frames.
+
+       i_qoffset float (encoding,video)
+	   Set QP offset between P and I frames.
+
+       dct integer (encoding,video)
+	   Set DCT algorithm.
+
+	   Possible values:
+
+	   auto
+	       autoselect a good one (default)
+
+	   fastint
+	       fast integer
+
+	   int accurate integer
+
+	   mmx
+	   altivec
+	   faan
+	       floating point AAN DCT
+
+       lumi_mask float (encoding,video)
+	   Compress bright areas stronger than medium ones.
+
+       tcplx_mask float (encoding,video)
+	   Set temporal complexity masking.
+
+       scplx_mask float (encoding,video)
+	   Set spatial complexity masking.
+
+       p_mask float (encoding,video)
+	   Set inter masking.
+
+       dark_mask float (encoding,video)
+	   Compress dark areas stronger than medium ones.
+
+       idct integer (decoding/encoding,video)
+	   Select IDCT implementation.
+
+	   Possible values:
+
+	   auto
+	   int
+	   simple
+	   simplemmx
+	   simpleauto
+	       Automatically pick a IDCT compatible with the simple one
+
+	   arm
+	   altivec
+	   sh4
+	   simplearm
+	   simplearmv5te
+	   simplearmv6
+	   simpleneon
+	   xvid
+	   faani
+	       floating point AAN IDCT
+
+       slice_count integer
+       ec flags (decoding,video)
+	   Set error concealment strategy.
+
+	   Possible values:
+
+	   guess_mvs
+	       iterative motion vector (MV) search (slow)
+
+	   deblock
+	       use strong deblock filter for damaged MBs
+
+	   favor_inter
+	       favor predicting from the previous frame instead of the current
+
+       bits_per_coded_sample integer
+       aspect rational number (encoding,video)
+	   Set sample aspect ratio.
+
+       sar rational number (encoding,video)
+	   Set sample aspect ratio. Alias to aspect.
+
+       debug flags (decoding/encoding,audio,video,subtitles)
+	   Print specific debug info.
+
+	   Possible values:
+
+	   pict
+	       picture info
+
+	   rc  rate control
+
+	   bitstream
+	   mb_type
+	       macroblock (MB) type
+
+	   qp  per-block quantization parameter (QP)
+
+	   dct_coeff
+	   green_metadata
+	       display complexity metadata for the upcoming frame, GoP or for
+	       a given duration.
+
+	   skip
+	   startcode
+	   er  error recognition
+
+	   mmco
+	       memory management control operations (H.264)
+
+	   bugs
+	   buffers
+	       picture buffer allocations
+
+	   thread_ops
+	       threading operations
+
+	   nomc
+	       skip motion compensation
+
+       cmp integer (encoding,video)
+	   Set full pel me compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       subcmp integer (encoding,video)
+	   Set sub pel me compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       mbcmp integer (encoding,video)
+	   Set macroblock compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       ildctcmp integer (encoding,video)
+	   Set interlaced dct compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       dia_size integer (encoding,video)
+	   Set diamond type & size for motion estimation.
+
+	   (1024, INT_MAX)
+	       full motion estimation(slowest)
+
+	   (768, 1024]
+	       umh motion estimation
+
+	   (512, 768]
+	       hex motion estimation
+
+	   (256, 512]
+	       l2s diamond motion estimation
+
+	   [2,256]
+	       var diamond motion estimation
+
+	   (-1,  2)
+	       small diamond motion estimation
+
+	   -1  funny diamond motion estimation
+
+	   (INT_MIN, -1)
+	       sab diamond motion estimation
+
+       last_pred integer (encoding,video)
+	   Set amount of motion predictors from the previous frame.
+
+       precmp integer (encoding,video)
+	   Set pre motion estimation compare function.
+
+	   Possible values:
+
+	   sad sum of absolute differences, fast (default)
+
+	   sse sum of squared errors
+
+	   satd
+	       sum of absolute Hadamard transformed differences
+
+	   dct sum of absolute DCT transformed differences
+
+	   psnr
+	       sum of squared quantization errors (avoid, low quality)
+
+	   bit number of bits needed for the block
+
+	   rd  rate distortion optimal, slow
+
+	   zero
+	       0
+
+	   vsad
+	       sum of absolute vertical differences
+
+	   vsse
+	       sum of squared vertical differences
+
+	   nsse
+	       noise preserving sum of squared differences
+
+	   w53 5/3 wavelet, only used in snow
+
+	   w97 9/7 wavelet, only used in snow
+
+	   dctmax
+	   chroma
+       pre_dia_size integer (encoding,video)
+	   Set diamond type & size for motion estimation pre-pass.
+
+       subq integer (encoding,video)
+	   Set sub pel motion estimation quality.
+
+       me_range integer (encoding,video)
+	   Set limit motion vectors range (1023 for DivX player).
+
+       global_quality integer (encoding,audio,video)
+       slice_flags integer
+       mbd integer (encoding,video)
+	   Set macroblock decision algorithm (high quality mode).
+
+	   Possible values:
+
+	   simple
+	       use mbcmp (default)
+
+	   bits
+	       use fewest bits
+
+	   rd  use best rate distortion
+
+       rc_init_occupancy integer (encoding,video)
+	   Set number of bits which should be loaded into the rc buffer before
+	   decoding starts.
+
+       flags2 flags (decoding/encoding,audio,video,subtitles)
+	   Possible values:
+
+	   fast
+	       Allow non spec compliant speedup tricks.
+
+	   noout
+	       Skip bitstream encoding.
+
+	   ignorecrop
+	       Ignore cropping information from sps.
+
+	   local_header
+	       Place global headers at every keyframe instead of in extradata.
+
+	   chunks
+	       Frame data might be split into multiple chunks.
+
+	   showall
+	       Show all frames before the first keyframe.
+
+	   export_mvs
+	       Export motion vectors into frame side-data (see
+	       "AV_FRAME_DATA_MOTION_VECTORS") for codecs that support it. See
+	       also doc/examples/export_mvs.c.
+
+	   skip_manual
+	       Do not skip samples and export skip information as frame side
+	       data.
+
+	   ass_ro_flush_noop
+	       Do not reset ASS ReadOrder field on flush.
+
+	   icc_profiles
+	       Generate/parse embedded ICC profiles from/to colorimetry tags.
+
+       export_side_data flags (decoding/encoding,audio,video,subtitles)
+	   Possible values:
+
+	   mvs Export motion vectors into frame side-data (see
+	       "AV_FRAME_DATA_MOTION_VECTORS") for codecs that support it. See
+	       also doc/examples/export_mvs.c.
+
+	   prft
+	       Export encoder Producer Reference Time into packet side-data
+	       (see "AV_PKT_DATA_PRFT") for codecs that support it.
+
+	   venc_params
+	       Export video encoding parameters through frame side data (see
+	       "AV_FRAME_DATA_VIDEO_ENC_PARAMS") for codecs that support it.
+	       At present, those are H.264 and VP9.
+
+	   film_grain
+	       Export film grain parameters through frame side data (see
+	       "AV_FRAME_DATA_FILM_GRAIN_PARAMS").  Supported at present by
+	       AV1 decoders.
+
+       threads integer (decoding/encoding,video)
+	   Set the number of threads to be used, in case the selected codec
+	   implementation supports multi-threading.
+
+	   Possible values:
+
+	   auto, 0
+	       automatically select the number of threads to set
+
+	   Default value is auto.
+
+       dc integer (encoding,video)
+	   Set intra_dc_precision.
+
+       nssew integer (encoding,video)
+	   Set nsse weight.
+
+       skip_top integer (decoding,video)
+	   Set number of macroblock rows at the top which are skipped.
+
+       skip_bottom integer (decoding,video)
+	   Set number of macroblock rows at the bottom which are skipped.
+
+       profile integer (encoding,audio,video)
+	   Set encoder codec profile. Default value is unknown. Encoder
+	   specific profiles are documented in the relevant encoder
+	   documentation.
+
+       level integer (encoding,audio,video)
+	   Set the encoder level. This level depends on the specific codec,
+	   and might correspond to the profile level. It is set by default to
+	   unknown.
+
+	   Possible values:
+
+	   unknown
+       lowres integer (decoding,audio,video)
+	   Decode at 1= 1/2, 2=1/4, 3=1/8 resolutions.
+
+       mblmin integer (encoding,video)
+	   Set min macroblock lagrange factor (VBR).
+
+       mblmax integer (encoding,video)
+	   Set max macroblock lagrange factor (VBR).
+
+       skip_loop_filter integer (decoding,video)
+       skip_idct	integer (decoding,video)
+       skip_frame	integer (decoding,video)
+	   Make decoder discard processing depending on the frame type
+	   selected by the option value.
+
+	   skip_loop_filter skips frame loop filtering, skip_idct skips frame
+	   IDCT/dequantization, skip_frame skips decoding.
+
+	   Possible values:
+
+	   none
+	       Discard no frame.
+
+	   default
+	       Discard useless frames like 0-sized frames.
+
+	   noref
+	       Discard all non-reference frames.
+
+	   bidir
+	       Discard all bidirectional frames.
+
+	   nokey
+	       Discard all frames excepts keyframes.
+
+	   nointra
+	       Discard all frames except I frames.
+
+	   all Discard all frames.
+
+	   Default value is default.
+
+       bidir_refine integer (encoding,video)
+	   Refine the two motion vectors used in bidirectional macroblocks.
+
+       keyint_min integer (encoding,video)
+	   Set minimum interval between IDR-frames.
+
+       refs integer (encoding,video)
+	   Set reference frames to consider for motion compensation.
+
+       trellis integer (encoding,audio,video)
+	   Set rate-distortion optimal quantization.
+
+       mv0_threshold integer (encoding,video)
+       compression_level integer (encoding,audio,video)
+       bits_per_raw_sample integer
+       channel_layout integer (decoding/encoding,audio)
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       rc_max_vbv_use float (encoding,video)
+       rc_min_vbv_use float (encoding,video)
+       color_primaries integer (decoding/encoding,video)
+	   Possible values:
+
+	   bt709
+	       BT.709
+
+	   bt470m
+	       BT.470 M
+
+	   bt470bg
+	       BT.470 BG
+
+	   smpte170m
+	       SMPTE 170 M
+
+	   smpte240m
+	       SMPTE 240 M
+
+	   film
+	       Film
+
+	   bt2020
+	       BT.2020
+
+	   smpte428
+	   smpte428_1
+	       SMPTE ST 428-1
+
+	   smpte431
+	       SMPTE 431-2
+
+	   smpte432
+	       SMPTE 432-1
+
+	   jedec-p22
+	       JEDEC P22
+
+       color_trc integer (decoding/encoding,video)
+	   Possible values:
+
+	   bt709
+	       BT.709
+
+	   gamma22
+	       BT.470 M
+
+	   gamma28
+	       BT.470 BG
+
+	   smpte170m
+	       SMPTE 170 M
+
+	   smpte240m
+	       SMPTE 240 M
+
+	   linear
+	       Linear
+
+	   log
+	   log100
+	       Log
+
+	   log_sqrt
+	   log316
+	       Log square root
+
+	   iec61966_2_4
+	   iec61966-2-4
+	       IEC 61966-2-4
+
+	   bt1361
+	   bt1361e
+	       BT.1361
+
+	   iec61966_2_1
+	   iec61966-2-1
+	       IEC 61966-2-1
+
+	   bt2020_10
+	   bt2020_10bit
+	       BT.2020 - 10 bit
+
+	   bt2020_12
+	   bt2020_12bit
+	       BT.2020 - 12 bit
+
+	   smpte2084
+	       SMPTE ST 2084
+
+	   smpte428
+	   smpte428_1
+	       SMPTE ST 428-1
+
+	   arib-std-b67
+	       ARIB STD-B67
+
+       colorspace integer (decoding/encoding,video)
+	   Possible values:
+
+	   rgb RGB
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt470bg
+	       BT.470 BG
+
+	   smpte170m
+	       SMPTE 170 M
+
+	   smpte240m
+	       SMPTE 240 M
+
+	   ycocg
+	       YCOCG
+
+	   bt2020nc
+	   bt2020_ncl
+	       BT.2020 NCL
+
+	   bt2020c
+	   bt2020_cl
+	       BT.2020 CL
+
+	   smpte2085
+	       SMPTE 2085
+
+	   chroma-derived-nc
+	       Chroma-derived NCL
+
+	   chroma-derived-c
+	       Chroma-derived CL
+
+	   ictcp
+	       ICtCp
+
+       color_range integer (decoding/encoding,video)
+	   If used as input parameter, it serves as a hint to the decoder,
+	   which color_range the input has.  Possible values:
+
+	   tv
+	   mpeg
+	   limited
+	       MPEG (219*2^(n-8))
+
+	   pc
+	   jpeg
+	   full
+	       JPEG (2^n-1)
+
+       chroma_sample_location integer (decoding/encoding,video)
+	   Possible values:
+
+	   left
+	   center
+	   topleft
+	   top
+	   bottomleft
+	   bottom
+       log_level_offset integer
+	   Set the log level offset.
+
+       slices integer (encoding,video)
+	   Number of slices, used in parallelized encoding.
+
+       thread_type flags (decoding/encoding,video)
+	   Select which multithreading methods to use.
+
+	   Use of frame will increase decoding delay by one frame per thread,
+	   so clients which cannot provide future frames should not use it.
+
+	   Possible values:
+
+	   slice
+	       Decode more than one part of a single frame at once.
+
+	       Multithreading using slices works only when the video was
+	       encoded with slices.
+
+	   frame
+	       Decode more than one frame at once.
+
+	   Default value is slice+frame.
+
+       audio_service_type integer (encoding,audio)
+	   Set audio service type.
+
+	   Possible values:
+
+	   ma  Main Audio Service
+
+	   ef  Effects
+
+	   vi  Visually Impaired
+
+	   hi  Hearing Impaired
+
+	   di  Dialogue
+
+	   co  Commentary
+
+	   em  Emergency
+
+	   vo  Voice Over
+
+	   ka  Karaoke
+
+       request_sample_fmt sample_fmt (decoding,audio)
+	   Set sample format audio decoders should prefer. Default value is
+	   "none".
+
+       pkt_timebase rational number
+       sub_charenc encoding (decoding,subtitles)
+	   Set the input subtitles character encoding.
+
+       field_order  field_order (video)
+	   Set/override the field order of the video.  Possible values:
+
+	   progressive
+	       Progressive video
+
+	   tt  Interlaced video, top field coded and displayed first
+
+	   bb  Interlaced video, bottom field coded and displayed first
+
+	   tb  Interlaced video, top coded first, bottom displayed first
+
+	   bt  Interlaced video, bottom coded first, top displayed first
+
+       skip_alpha bool (decoding,video)
+	   Set to 1 to disable processing alpha (transparency). This works
+	   like the gray flag in the flags option which skips chroma
+	   information instead of alpha. Default is 0.
+
+       codec_whitelist list (input)
+	   "," separated list of allowed decoders. By default all are allowed.
+
+       dump_separator string (input)
+	   Separator used to separate the fields printed on the command line
+	   about the Stream parameters.  For example, to separate the fields
+	   with newlines and indentation:
+
+		   ffprobe -dump_separator "
+					     "	-i ~/videos/matrixbench_mpeg2.mpg
+
+       max_pixels integer (decoding/encoding,video)
+	   Maximum number of pixels per image. This value can be used to avoid
+	   out of memory failures due to large images.
+
+       apply_cropping bool (decoding,video)
+	   Enable cropping if cropping parameters are multiples of the
+	   required alignment for the left and top parameters. If the
+	   alignment is not met the cropping will be partially applied to
+	   maintain alignment.	Default is 1 (enabled).  Note: The required
+	   alignment depends on if "AV_CODEC_FLAG_UNALIGNED" is set and the
+	   CPU. "AV_CODEC_FLAG_UNALIGNED" cannot be changed from the command
+	   line. Also hardware decoders will not apply left/top Cropping.
+
+DECODERS
+       Decoders are configured elements in FFmpeg which allow the decoding of
+       multimedia streams.
+
+       When you configure your FFmpeg build, all the supported native decoders
+       are enabled by default. Decoders requiring an external library must be
+       enabled manually via the corresponding "--enable-lib" option. You can
+       list all available decoders using the configure option
+       "--list-decoders".
+
+       You can disable all the decoders with the configure option
+       "--disable-decoders" and selectively enable / disable single decoders
+       with the options "--enable-decoder=DECODER" /
+       "--disable-decoder=DECODER".
+
+       The option "-decoders" of the ff* tools will display the list of
+       enabled decoders.
+
+VIDEO DECODERS
+       A description of some of the currently available video decoders
+       follows.
+
+   av1
+       AOMedia Video 1 (AV1) decoder.
+
+       Options
+
+       operating_point
+	   Select an operating point of a scalable AV1 bitstream (0 - 31).
+	   Default is 0.
+
+   rawvideo
+       Raw video decoder.
+
+       This decoder decodes rawvideo streams.
+
+       Options
+
+       top top_field_first
+	   Specify the assumed field type of the input video.
+
+	   -1  the video is assumed to be progressive (default)
+
+	   0   bottom-field-first is assumed
+
+	   1   top-field-first is assumed
+
+   libdav1d
+       dav1d AV1 decoder.
+
+       libdav1d allows libavcodec to decode the AOMedia Video 1 (AV1) codec.
+       Requires the presence of the libdav1d headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libdav1d".
+
+       Options
+
+       The following options are supported by the libdav1d wrapper.
+
+       framethreads
+	   Set amount of frame threads to use during decoding. The default
+	   value is 0 (autodetect).  This option is deprecated for libdav1d >=
+	   1.0 and will be removed in the future. Use the option
+	   "max_frame_delay" and the global option "threads" instead.
+
+       tilethreads
+	   Set amount of tile threads to use during decoding. The default
+	   value is 0 (autodetect).  This option is deprecated for libdav1d >=
+	   1.0 and will be removed in the future. Use the global option
+	   "threads" instead.
+
+       max_frame_delay
+	   Set max amount of frames the decoder may buffer internally. The
+	   default value is 0 (autodetect).
+
+       filmgrain
+	   Apply film grain to the decoded video if present in the bitstream.
+	   Defaults to the internal default of the library.  This option is
+	   deprecated and will be removed in the future. See the global option
+	   "export_side_data" to export Film Grain parameters instead of
+	   applying it.
+
+       oppoint
+	   Select an operating point of a scalable AV1 bitstream (0 - 31).
+	   Defaults to the internal default of the library.
+
+       alllayers
+	   Output all spatial layers of a scalable AV1 bitstream. The default
+	   value is false.
+
+   libdavs2
+       AVS2-P2/IEEE1857.4 video decoder wrapper.
+
+       This decoder allows libavcodec to decode AVS2 streams with davs2
+       library.
+
+   libuavs3d
+       AVS3-P2/IEEE1857.10 video decoder.
+
+       libuavs3d allows libavcodec to decode AVS3 streams.  Requires the
+       presence of the libuavs3d headers and library during configuration.
+       You need to explicitly configure the build with "--enable-libuavs3d".
+
+       Options
+
+       The following option is supported by the libuavs3d wrapper.
+
+       frame_threads
+	   Set amount of frame threads to use during decoding. The default
+	   value is 0 (autodetect).
+
+   libxevd
+       eXtra-fast Essential Video Decoder (XEVD) MPEG-5 EVC decoder wrapper.
+
+       This decoder requires the presence of the libxevd headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libxevd.
+
+       The xevd project website is at <https://github.com/mpeg5/xevd>.
+
+       Options
+
+       The following options are supported by the libxevd wrapper.  The xevd-
+       equivalent options or values are listed in parentheses for easy
+       migration.
+
+       To get a more accurate and extensive documentation of the libxevd
+       options, invoke the command  "xevd_app --help" or consult the libxevd
+       documentation.
+
+       threads (threads)
+	   Force to use a specific number of threads
+
+   QSV Decoders
+       The family of Intel QuickSync Video decoders (VC1, MPEG-2, H.264, HEVC,
+       JPEG/MJPEG, VP8, VP9, AV1).
+
+       Common Options
+
+       The following options are supported by all qsv decoders.
+
+       async_depth
+	   Internal parallelization depth, the higher the value the higher the
+	   latency.
+
+       gpu_copy
+	   A GPU-accelerated copy between video and system memory
+
+	   default
+	   on
+	   off
+
+       HEVC Options
+
+       Extra options for hevc_qsv.
+
+       load_plugin
+	   A user plugin to load in an internal session
+
+	   none
+	   hevc_sw
+	   hevc_hw
+       load_plugins
+	   A :-separate list of hexadecimal plugin UIDs to load in an internal
+	   session
+
+   v210
+       Uncompressed 4:2:2 10-bit decoder.
+
+       Options
+
+       custom_stride
+	   Set the line size of the v210 data in bytes. The default value is 0
+	   (autodetect). You can use the special -1 value for a strideless
+	   v210 as seen in BOXX files.
+
+AUDIO DECODERS
+       A description of some of the currently available audio decoders
+       follows.
+
+   ac3
+       AC-3 audio decoder.
+
+       This decoder implements part of ATSC A/52:2010 and ETSI TS 102 366, as
+       well as the undocumented RealAudio 3 (a.k.a. dnet).
+
+       AC-3 Decoder Options
+
+       -drc_scale value
+	   Dynamic Range Scale Factor. The factor to apply to dynamic range
+	   values from the AC-3 stream. This factor is applied exponentially.
+	   The default value is 1.  There are 3 notable scale factor ranges:
+
+	   drc_scale == 0
+	       DRC disabled. Produces full range audio.
+
+	   0 < drc_scale <= 1
+	       DRC enabled.  Applies a fraction of the stream DRC value.
+	       Audio reproduction is between full range and full compression.
+
+	   drc_scale > 1
+	       DRC enabled. Applies drc_scale asymmetrically.  Loud sounds are
+	       fully compressed.  Soft sounds are enhanced.
+
+   flac
+       FLAC audio decoder.
+
+       This decoder aims to implement the complete FLAC specification from
+       Xiph.
+
+       FLAC Decoder options
+
+       -use_buggy_lpc
+	   The lavc FLAC encoder used to produce buggy streams with high lpc
+	   values (like the default value). This option makes it possible to
+	   decode such streams correctly by using lavc's old buggy lpc logic
+	   for decoding.
+
+   ffwavesynth
+       Internal wave synthesizer.
+
+       This decoder generates wave patterns according to predefined sequences.
+       Its use is purely internal and the format of the data it accepts is not
+       publicly documented.
+
+   libcelt
+       libcelt decoder wrapper.
+
+       libcelt allows libavcodec to decode the Xiph CELT ultra-low delay audio
+       codec.  Requires the presence of the libcelt headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libcelt".
+
+   libgsm
+       libgsm decoder wrapper.
+
+       libgsm allows libavcodec to decode the GSM full rate audio codec.
+       Requires the presence of the libgsm headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libgsm".
+
+       This decoder supports both the ordinary GSM and the Microsoft variant.
+
+   libilbc
+       libilbc decoder wrapper.
+
+       libilbc allows libavcodec to decode the Internet Low Bitrate Codec
+       (iLBC) audio codec. Requires the presence of the libilbc headers and
+       library during configuration. You need to explicitly configure the
+       build with "--enable-libilbc".
+
+       Options
+
+       The following option is supported by the libilbc wrapper.
+
+       enhance
+	   Enable the enhancement of the decoded audio when set to 1. The
+	   default value is 0 (disabled).
+
+   libopencore-amrnb
+       libopencore-amrnb decoder wrapper.
+
+       libopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate
+       Narrowband audio codec. Using it requires the presence of the
+       libopencore-amrnb headers and library during configuration. You need to
+       explicitly configure the build with "--enable-libopencore-amrnb".
+
+       An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB
+       without this library.
+
+   libopencore-amrwb
+       libopencore-amrwb decoder wrapper.
+
+       libopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate
+       Wideband audio codec. Using it requires the presence of the
+       libopencore-amrwb headers and library during configuration. You need to
+       explicitly configure the build with "--enable-libopencore-amrwb".
+
+       An FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB
+       without this library.
+
+   libopus
+       libopus decoder wrapper.
+
+       libopus allows libavcodec to decode the Opus Interactive Audio Codec.
+       Requires the presence of the libopus headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libopus".
+
+       An FFmpeg native decoder for Opus exists, so users can decode Opus
+       without this library.
+
+SUBTITLES DECODERS
+   libaribb24
+       ARIB STD-B24 caption decoder.
+
+       Implements profiles A and C of the ARIB STD-B24 standard.
+
+       libaribb24 Decoder Options
+
+       -aribb24-base-path path
+	   Sets the base path for the libaribb24 library. This is utilized for
+	   reading of configuration files (for custom unicode conversions),
+	   and for dumping of non-text symbols as images under that location.
+
+	   Unset by default.
+
+       -aribb24-skip-ruby-text boolean
+	   Tells the decoder wrapper to skip text blocks that contain half-
+	   height ruby text.
+
+	   Enabled by default.
+
+   libaribcaption
+       Yet another ARIB STD-B24 caption decoder using external libaribcaption
+       library.
+
+       Implements profiles A and C of the Japanse ARIB STD-B24 standard,
+       Brazilian ABNT NBR 15606-1, and Philippines version of ISDB-T.
+
+       Requires the presence of the libaribcaption headers and library
+       (<https://github.com/xqq/libaribcaption>) during configuration.	You
+       need to explicitly configure the build with "--enable-libaribcaption".
+       If both libaribb24 and libaribcaption are enabled, libaribcaption
+       decoder precedes.
+
+       libaribcaption Decoder Options
+
+       -sub_type subtitle_type
+	   Specifies the format of the decoded subtitles.
+
+	   bitmap
+	       Graphical image.
+
+	   ass ASS formatted text.
+
+	   text
+	       Simple text based output without formatting.
+
+	   The default is ass as same as libaribb24 decoder.  Some present
+	   players (e.g., mpv) expect ASS format for ARIB caption.
+
+       -caption_encoding encoding_scheme
+	   Specifies the encoding scheme of input subtitle text.
+
+	   auto
+	       Automatically detect text encoding (default).
+
+	   jis 8bit-char JIS encoding defined in ARIB STD B24.	This encoding
+	       used in Japan for ISDB captions.
+
+	   utf8
+	       UTF-8 encoding defined in ARIB STD B24.	This encoding is used
+	       in Philippines for ISDB-T captions.
+
+	   latin
+	       Latin character encoding defined in ABNT NBR 15606-1.  This
+	       encoding is used in South America for SBTVD / ISDB-Tb captions.
+
+       -font font_name[,font_name2,...]
+	   Specify comma-separated list of font family names to be used for
+	   bitmap or ass type subtitle rendering.  Only first font name is
+	   used for ass type subtitle.
+
+	   If not specified, use internaly defined default font family.
+
+       -ass_single_rect boolean
+	   ARIB STD-B24 specifies that some captions may be displayed at
+	   different positions at a time (multi-rectangle subtitle).  Since
+	   some players (e.g., old mpv) can't handle multiple ASS rectangles
+	   in a single AVSubtitle, or multiple ASS rectangles of indeterminate
+	   duration with the same start timestamp, this option can change the
+	   behavior so that all the texts are displayed in a single ASS
+	   rectangle.
+
+	   The default is false.
+
+	   If your player cannot handle AVSubtitles with multiple ASS
+	   rectangles properly, set this option to true or define
+	   ASS_SINGLE_RECT=1 to change default behavior at compilation.
+
+       -force_outline_text boolean
+	   Specify whether always render outline text for all characters
+	   regardless of the indication by charactor style.
+
+	   The default is false.
+
+       -outline_width number (0.0 - 3.0)
+	   Specify width for outline text, in dots (relative).
+
+	   The default is 1.5.
+
+       -ignore_background boolean
+	   Specify whether to ignore background color rendering.
+
+	   The default is false.
+
+       -ignore_ruby boolean
+	   Specify whether to ignore rendering for ruby-like (furigana)
+	   characters.
+
+	   The default is false.
+
+       -replace_drcs boolean
+	   Specify whether to render replaced DRCS characters as Unicode
+	   characters.
+
+	   The default is true.
+
+       -replace_msz_ascii boolean
+	   Specify whether to replace MSZ (Middle Size; half width) fullwidth
+	   alphanumerics with halfwidth alphanumerics.
+
+	   The default is true.
+
+       -replace_msz_japanese boolean
+	   Specify whether to replace some MSZ (Middle Size; half width)
+	   fullwidth japanese special characters with halfwidth ones.
+
+	   The default is true.
+
+       -replace_msz_glyph boolean
+	   Specify whether to replace MSZ (Middle Size; half width) characters
+	   with halfwidth glyphs if the fonts supports it.  This option works
+	   under FreeType or DirectWrite renderer with Adobe-Japan1 compliant
+	   fonts.  e.g., IBM Plex Sans JP, Morisawa BIZ UDGothic, Morisawa BIZ
+	   UDMincho, Yu Gothic, Yu Mincho, and Meiryo.
+
+	   The default is true.
+
+       -canvas_size image_size
+	   Specify the resolution of the canvas to render subtitles to;
+	   usually, this should be frame size of input video.  This only
+	   applies when "-subtitle_type" is set to bitmap.
+
+	   The libaribcaption decoder assumes input frame size for bitmap
+	   rendering as below:
+
+	   1.  PROFILE_A : 1440 x 1080 with SAR (PAR) 4:3
+
+	   2.  PROFILE_C : 320 x 180 with SAR (PAR) 1:1
+
+	   If actual frame size of input video does not match above
+	   assumption, the rendered captions may be distorted.	To make the
+	   captions undistorted, add "-canvas_size" option to specify actual
+	   input video size.
+
+	   Note that the "-canvas_size" option is not required for video with
+	   different size but same aspect ratio.  In such cases, the caption
+	   will be stretched or shrunk to actual video size if "-canvas_size"
+	   option is not specified.  If "-canvas_size" option is specified
+	   with different size, the caption will be stretched or shrunk as
+	   specified size with calculated SAR.
+
+       libaribcaption decoder usage examples
+
+       Display MPEG-TS file with ARIB subtitle by "ffplay" tool:
+
+	       ffplay -sub_type bitmap MPEG.TS
+
+       Display MPEG-TS file with input frame size 1920x1080 by "ffplay" tool:
+
+	       ffplay -sub_type bitmap -canvas_size 1920x1080 MPEG.TS
+
+       Embed ARIB subtitle in transcoded video:
+
+	       ffmpeg -sub_type bitmap -i src.m2t -filter_complex "[0:v][0:s]overlay" -vcodec h264 dest.mp4
+
+   dvbsub
+       Options
+
+       compute_clut
+	   -2  Compute clut once if no matching CLUT is in the stream.
+
+	   -1  Compute clut if no matching CLUT is in the stream.
+
+	   0   Never compute CLUT
+
+	   1   Always compute CLUT and override the one provided in the
+	       stream.
+
+       dvb_substream
+	   Selects the dvb substream, or all substreams if -1 which is
+	   default.
+
+   dvdsub
+       This codec decodes the bitmap subtitles used in DVDs; the same
+       subtitles can also be found in VobSub file pairs and in some Matroska
+       files.
+
+       Options
+
+       palette
+	   Specify the global palette used by the bitmaps. When stored in
+	   VobSub, the palette is normally specified in the index file; in
+	   Matroska, the palette is stored in the codec extra-data in the same
+	   format as in VobSub. In DVDs, the palette is stored in the IFO
+	   file, and therefore not available when reading from dumped VOB
+	   files.
+
+	   The format for this option is a string containing 16 24-bits
+	   hexadecimal numbers (without 0x prefix) separated by commas, for
+	   example "0d00ee, ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b,
+	   0d617a, 7b7b7b, d1d1d1, 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c,
+	   7c127b".
+
+       ifo_palette
+	   Specify the IFO file from which the global palette is obtained.
+	   (experimental)
+
+       forced_subs_only
+	   Only decode subtitle entries marked as forced. Some titles have
+	   forced and non-forced subtitles in the same track. Setting this
+	   flag to 1 will only keep the forced subtitles. Default value is 0.
+
+   libzvbi-teletext
+       Libzvbi allows libavcodec to decode DVB teletext pages and DVB teletext
+       subtitles. Requires the presence of the libzvbi headers and library
+       during configuration. You need to explicitly configure the build with
+       "--enable-libzvbi".
+
+       Options
+
+       txt_page
+	   List of teletext page numbers to decode. Pages that do not match
+	   the specified list are dropped. You may use the special "*" string
+	   to match all pages, or "subtitle" to match all subtitle pages.
+	   Default value is *.
+
+       txt_default_region
+	   Set default character set used for decoding, a value between 0 and
+	   87 (see ETS 300 706, Section 15, Table 32). Default value is -1,
+	   which does not override the libzvbi default. This option is needed
+	   for some legacy level 1.0 transmissions which cannot signal the
+	   proper charset.
+
+       txt_chop_top
+	   Discards the top teletext line. Default value is 1.
+
+       txt_format
+	   Specifies the format of the decoded subtitles.
+
+	   bitmap
+	       The default format, you should use this for teletext pages,
+	       because certain graphics and colors cannot be expressed in
+	       simple text or even ASS.
+
+	   text
+	       Simple text based output without formatting.
+
+	   ass Formatted ASS output, subtitle pages and teletext pages are
+	       returned in different styles, subtitle pages are stripped down
+	       to text, but an effort is made to keep the text alignment and
+	       the formatting.
+
+       txt_left
+	   X offset of generated bitmaps, default is 0.
+
+       txt_top
+	   Y offset of generated bitmaps, default is 0.
+
+       txt_chop_spaces
+	   Chops leading and trailing spaces and removes empty lines from the
+	   generated text. This option is useful for teletext based subtitles
+	   where empty spaces may be present at the start or at the end of the
+	   lines or empty lines may be present between the subtitle lines
+	   because of double-sized teletext characters.  Default value is 1.
+
+       txt_duration
+	   Sets the display duration of the decoded teletext pages or
+	   subtitles in milliseconds. Default value is -1 which means infinity
+	   or until the next subtitle event comes.
+
+       txt_transparent
+	   Force transparent background of the generated teletext bitmaps.
+	   Default value is 0 which means an opaque background.
+
+       txt_opacity
+	   Sets the opacity (0-255) of the teletext background. If
+	   txt_transparent is not set, it only affects characters between a
+	   start box and an end box, typically subtitles. Default value is 0
+	   if txt_transparent is set, 255 otherwise.
+
+ENCODERS
+       Encoders are configured elements in FFmpeg which allow the encoding of
+       multimedia streams.
+
+       When you configure your FFmpeg build, all the supported native encoders
+       are enabled by default. Encoders requiring an external library must be
+       enabled manually via the corresponding "--enable-lib" option. You can
+       list all available encoders using the configure option
+       "--list-encoders".
+
+       You can disable all the encoders with the configure option
+       "--disable-encoders" and selectively enable / disable single encoders
+       with the options "--enable-encoder=ENCODER" /
+       "--disable-encoder=ENCODER".
+
+       The option "-encoders" of the ff* tools will display the list of
+       enabled encoders.
+
+AUDIO ENCODERS
+       A description of some of the currently available audio encoders
+       follows.
+
+   aac
+       Advanced Audio Coding (AAC) encoder.
+
+       This encoder is the default AAC encoder, natively implemented into
+       FFmpeg.
+
+       Options
+
+       b   Set bit rate in bits/s. Setting this automatically activates
+	   constant bit rate (CBR) mode. If this option is unspecified it is
+	   set to 128kbps.
+
+       q   Set quality for variable bit rate (VBR) mode. This option is valid
+	   only using the ffmpeg command-line tool. For library interface
+	   users, use global_quality.
+
+       cutoff
+	   Set cutoff frequency. If unspecified will allow the encoder to
+	   dynamically adjust the cutoff to improve clarity on low bitrates.
+
+       aac_coder
+	   Set AAC encoder coding method. Possible values:
+
+	   twoloop
+	       Two loop searching (TLS) method. This is the default method.
+
+	       This method first sets quantizers depending on band thresholds
+	       and then tries to find an optimal combination by adding or
+	       subtracting a specific value from all quantizers and adjusting
+	       some individual quantizer a little.  Will tune itself based on
+	       whether aac_is, aac_ms and aac_pns are enabled.
+
+	   anmr
+	       Average noise to mask ratio (ANMR) trellis-based solution.
+
+	       This is an experimental coder which currently produces a lower
+	       quality, is more unstable and is slower than the default
+	       twoloop coder but has potential.  Currently has no support for
+	       the aac_is or aac_pns options.  Not currently recommended.
+
+	   fast
+	       Constant quantizer method.
+
+	       Uses a cheaper version of twoloop algorithm that doesn't try to
+	       do as many clever adjustments. Worse with low bitrates (less
+	       than 64kbps), but is better and much faster at higher bitrates.
+
+       aac_ms
+	   Sets mid/side coding mode. The default value of "auto" will
+	   automatically use M/S with bands which will benefit from such
+	   coding. Can be forced for all bands using the value "enable", which
+	   is mainly useful for debugging or disabled using "disable".
+
+       aac_is
+	   Sets intensity stereo coding tool usage. By default, it's enabled
+	   and will automatically toggle IS for similar pairs of stereo bands
+	   if it's beneficial.	Can be disabled for debugging by setting the
+	   value to "disable".
+
+       aac_pns
+	   Uses perceptual noise substitution to replace low entropy high
+	   frequency bands with imperceptible white noise during the decoding
+	   process. By default, it's enabled, but can be disabled for
+	   debugging purposes by using "disable".
+
+       aac_tns
+	   Enables the use of a multitap FIR filter which spans through the
+	   high frequency bands to hide quantization noise during the encoding
+	   process and is reverted by the decoder. As well as decreasing
+	   unpleasant artifacts in the high range this also reduces the
+	   entropy in the high bands and allows for more bits to be used by
+	   the mid-low bands. By default it's enabled but can be disabled for
+	   debugging by setting the option to "disable".
+
+       aac_ltp
+	   Enables the use of the long term prediction extension which
+	   increases coding efficiency in very low bandwidth situations such
+	   as encoding of voice or solo piano music by extending constant
+	   harmonic peaks in bands throughout frames. This option is implied
+	   by profile:a aac_low and is incompatible with aac_pred. Use in
+	   conjunction with -ar to decrease the samplerate.
+
+       aac_pred
+	   Enables the use of a more traditional style of prediction where the
+	   spectral coefficients transmitted are replaced by the difference of
+	   the current coefficients minus the previous "predicted"
+	   coefficients. In theory and sometimes in practice this can improve
+	   quality for low to mid bitrate audio.  This option implies the
+	   aac_main profile and is incompatible with aac_ltp.
+
+       profile
+	   Sets the encoding profile, possible values:
+
+	   aac_low
+	       The default, AAC "Low-complexity" profile. Is the most
+	       compatible and produces decent quality.
+
+	   mpeg2_aac_low
+	       Equivalent to "-profile:a aac_low -aac_pns 0". PNS was
+	       introduced with the MPEG4 specifications.
+
+	   aac_ltp
+	       Long term prediction profile, is enabled by and will enable the
+	       aac_ltp option. Introduced in MPEG4.
+
+	   aac_main
+	       Main-type prediction profile, is enabled by and will enable the
+	       aac_pred option. Introduced in MPEG2.
+
+	   If this option is unspecified it is set to aac_low.
+
+   ac3 and ac3_fixed
+       AC-3 audio encoders.
+
+       These encoders implement part of ATSC A/52:2010 and ETSI TS 102 366, as
+       well as the undocumented RealAudio 3 (a.k.a. dnet).
+
+       The ac3 encoder uses floating-point math, while the ac3_fixed encoder
+       only uses fixed-point integer math. This does not mean that one is
+       always faster, just that one or the other may be better suited to a
+       particular system. The ac3_fixed encoder is not the default codec for
+       any of the output formats, so it must be specified explicitly using the
+       option "-acodec ac3_fixed" in order to use it.
+
+       AC-3 Metadata
+
+       The AC-3 metadata options are used to set parameters that describe the
+       audio, but in most cases do not affect the audio encoding itself. Some
+       of the options do directly affect or influence the decoding and
+       playback of the resulting bitstream, while others are just for
+       informational purposes. A few of the options will add bits to the
+       output stream that could otherwise be used for audio data, and will
+       thus affect the quality of the output. Those will be indicated
+       accordingly with a note in the option list below.
+
+       These parameters are described in detail in several publicly-available
+       documents.
+
+       *<<http://www.atsc.org/cms/standards/a_52-2010.pdf>>
+       *<<http://www.atsc.org/cms/standards/a_54a_with_corr_1.pdf>>
+       *<<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/18_Metadata.Guide.pdf>>
+       *<<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf>>
+
+       Metadata Control Options
+
+       -per_frame_metadata boolean
+	   Allow Per-Frame Metadata. Specifies if the encoder should check for
+	   changing metadata for each frame.
+
+	   0   The metadata values set at initialization will be used for
+	       every frame in the stream. (default)
+
+	   1   Metadata values can be changed before encoding each frame.
+
+       Downmix Levels
+
+       -center_mixlev level
+	   Center Mix Level. The amount of gain the decoder should apply to
+	   the center channel when downmixing to stereo. This field will only
+	   be written to the bitstream if a center channel is present. The
+	   value is specified as a scale factor. There are 3 valid values:
+
+	   0.707
+	       Apply -3dB gain
+
+	   0.595
+	       Apply -4.5dB gain (default)
+
+	   0.500
+	       Apply -6dB gain
+
+       -surround_mixlev level
+	   Surround Mix Level. The amount of gain the decoder should apply to
+	   the surround channel(s) when downmixing to stereo. This field will
+	   only be written to the bitstream if one or more surround channels
+	   are present. The value is specified as a scale factor.  There are 3
+	   valid values:
+
+	   0.707
+	       Apply -3dB gain
+
+	   0.500
+	       Apply -6dB gain (default)
+
+	   0.000
+	       Silence Surround Channel(s)
+
+       Audio Production Information
+
+       Audio Production Information is optional information describing the
+       mixing environment.  Either none or both of the fields are written to
+       the bitstream.
+
+       -mixing_level number
+	   Mixing Level. Specifies peak sound pressure level (SPL) in the
+	   production environment when the mix was mastered. Valid values are
+	   80 to 111, or -1 for unknown or not indicated. The default value is
+	   -1, but that value cannot be used if the Audio Production
+	   Information is written to the bitstream. Therefore, if the
+	   "room_type" option is not the default value, the "mixing_level"
+	   option must not be -1.
+
+       -room_type type
+	   Room Type. Describes the equalization used during the final mixing
+	   session at the studio or on the dubbing stage. A large room is a
+	   dubbing stage with the industry standard X-curve equalization; a
+	   small room has flat equalization.  This field will not be written
+	   to the bitstream if both the "mixing_level" option and the
+	   "room_type" option have the default values.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   large
+	       Large Room
+
+	   2
+	   small
+	       Small Room
+
+       Other Metadata Options
+
+       -copyright boolean
+	   Copyright Indicator. Specifies whether a copyright exists for this
+	   audio.
+
+	   0
+	   off No Copyright Exists (default)
+
+	   1
+	   on  Copyright Exists
+
+       -dialnorm value
+	   Dialogue Normalization. Indicates how far the average dialogue
+	   level of the program is below digital 100% full scale (0 dBFS).
+	   This parameter determines a level shift during audio reproduction
+	   that sets the average volume of the dialogue to a preset level. The
+	   goal is to match volume level between program sources. A value of
+	   -31dB will result in no volume level change, relative to the source
+	   volume, during audio reproduction. Valid values are whole numbers
+	   in the range -31 to -1, with -31 being the default.
+
+       -dsur_mode mode
+	   Dolby Surround Mode. Specifies whether the stereo signal uses Dolby
+	   Surround (Pro Logic). This field will only be written to the
+	   bitstream if the audio stream is stereo. Using this option does NOT
+	   mean the encoder will actually apply Dolby Surround processing.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   off Not Dolby Surround Encoded
+
+	   2
+	   on  Dolby Surround Encoded
+
+       -original boolean
+	   Original Bit Stream Indicator. Specifies whether this audio is from
+	   the original source and not a copy.
+
+	   0
+	   off Not Original Source
+
+	   1
+	   on  Original Source (default)
+
+       Extended Bitstream Information
+
+       The extended bitstream options are part of the Alternate Bit Stream
+       Syntax as specified in Annex D of the A/52:2010 standard. It is grouped
+       into 2 parts.  If any one parameter in a group is specified, all values
+       in that group will be written to the bitstream.	Default values are
+       used for those that are written but have not been specified.  If the
+       mixing levels are written, the decoder will use these values instead of
+       the ones specified in the "center_mixlev" and "surround_mixlev" options
+       if it supports the Alternate Bit Stream Syntax.
+
+       Extended Bitstream Information - Part 1
+
+       -dmix_mode mode
+	   Preferred Stereo Downmix Mode. Allows the user to select either
+	   Lt/Rt (Dolby Surround) or Lo/Ro (normal stereo) as the preferred
+	   stereo downmix mode.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   ltrt
+	       Lt/Rt Downmix Preferred
+
+	   2
+	   loro
+	       Lo/Ro Downmix Preferred
+
+       -ltrt_cmixlev level
+	   Lt/Rt Center Mix Level. The amount of gain the decoder should apply
+	   to the center channel when downmixing to stereo in Lt/Rt mode.
+
+	   1.414
+	       Apply +3dB gain
+
+	   1.189
+	       Apply +1.5dB gain
+
+	   1.000
+	       Apply 0dB gain
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain (default)
+
+	   0.500
+	       Apply -6.0dB gain
+
+	   0.000
+	       Silence Center Channel
+
+       -ltrt_surmixlev level
+	   Lt/Rt Surround Mix Level. The amount of gain the decoder should
+	   apply to the surround channel(s) when downmixing to stereo in Lt/Rt
+	   mode.
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain
+
+	   0.500
+	       Apply -6.0dB gain (default)
+
+	   0.000
+	       Silence Surround Channel(s)
+
+       -loro_cmixlev level
+	   Lo/Ro Center Mix Level. The amount of gain the decoder should apply
+	   to the center channel when downmixing to stereo in Lo/Ro mode.
+
+	   1.414
+	       Apply +3dB gain
+
+	   1.189
+	       Apply +1.5dB gain
+
+	   1.000
+	       Apply 0dB gain
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain (default)
+
+	   0.500
+	       Apply -6.0dB gain
+
+	   0.000
+	       Silence Center Channel
+
+       -loro_surmixlev level
+	   Lo/Ro Surround Mix Level. The amount of gain the decoder should
+	   apply to the surround channel(s) when downmixing to stereo in Lo/Ro
+	   mode.
+
+	   0.841
+	       Apply -1.5dB gain
+
+	   0.707
+	       Apply -3.0dB gain
+
+	   0.595
+	       Apply -4.5dB gain
+
+	   0.500
+	       Apply -6.0dB gain (default)
+
+	   0.000
+	       Silence Surround Channel(s)
+
+       Extended Bitstream Information - Part 2
+
+       -dsurex_mode mode
+	   Dolby Surround EX Mode. Indicates whether the stream uses Dolby
+	   Surround EX (7.1 matrixed to 5.1). Using this option does NOT mean
+	   the encoder will actually apply Dolby Surround EX processing.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   on  Dolby Surround EX Off
+
+	   2
+	   off Dolby Surround EX On
+
+       -dheadphone_mode mode
+	   Dolby Headphone Mode. Indicates whether the stream uses Dolby
+	   Headphone encoding (multi-channel matrixed to 2.0 for use with
+	   headphones). Using this option does NOT mean the encoder will
+	   actually apply Dolby Headphone processing.
+
+	   0
+	   notindicated
+	       Not Indicated (default)
+
+	   1
+	   on  Dolby Headphone Off
+
+	   2
+	   off Dolby Headphone On
+
+       -ad_conv_type type
+	   A/D Converter Type. Indicates whether the audio has passed through
+	   HDCD A/D conversion.
+
+	   0
+	   standard
+	       Standard A/D Converter (default)
+
+	   1
+	   hdcd
+	       HDCD A/D Converter
+
+       Other AC-3 Encoding Options
+
+       -stereo_rematrixing boolean
+	   Stereo Rematrixing. Enables/Disables use of rematrixing for stereo
+	   input. This is an optional AC-3 feature that increases quality by
+	   selectively encoding the left/right channels as mid/side. This
+	   option is enabled by default, and it is highly recommended that it
+	   be left as enabled except for testing purposes.
+
+       cutoff frequency
+	   Set lowpass cutoff frequency. If unspecified, the encoder selects a
+	   default determined by various other encoding parameters.
+
+       Floating-Point-Only AC-3 Encoding Options
+
+       These options are only valid for the floating-point encoder and do not
+       exist for the fixed-point encoder due to the corresponding features not
+       being implemented in fixed-point.
+
+       -channel_coupling boolean
+	   Enables/Disables use of channel coupling, which is an optional AC-3
+	   feature that increases quality by combining high frequency
+	   information from multiple channels into a single channel. The per-
+	   channel high frequency information is sent with less accuracy in
+	   both the frequency and time domains. This allows more bits to be
+	   used for lower frequencies while preserving enough information to
+	   reconstruct the high frequencies. This option is enabled by default
+	   for the floating-point encoder and should generally be left as
+	   enabled except for testing purposes or to increase encoding speed.
+
+	   -1
+	   auto
+	       Selected by Encoder (default)
+
+	   0
+	   off Disable Channel Coupling
+
+	   1
+	   on  Enable Channel Coupling
+
+       -cpl_start_band number
+	   Coupling Start Band. Sets the channel coupling start band, from 1
+	   to 15. If a value higher than the bandwidth is used, it will be
+	   reduced to 1 less than the coupling end band. If auto is used, the
+	   start band will be determined by the encoder based on the bit rate,
+	   sample rate, and channel layout. This option has no effect if
+	   channel coupling is disabled.
+
+	   -1
+	   auto
+	       Selected by Encoder (default)
+
+   flac
+       FLAC (Free Lossless Audio Codec) Encoder
+
+       Options
+
+       The following options are supported by FFmpeg's flac encoder.
+
+       compression_level
+	   Sets the compression level, which chooses defaults for many other
+	   options if they are not set explicitly. Valid values are from 0 to
+	   12, 5 is the default.
+
+       frame_size
+	   Sets the size of the frames in samples per channel.
+
+       lpc_coeff_precision
+	   Sets the LPC coefficient precision, valid values are from 1 to 15,
+	   15 is the default.
+
+       lpc_type
+	   Sets the first stage LPC algorithm
+
+	   none
+	       LPC is not used
+
+	   fixed
+	       fixed LPC coefficients
+
+	   levinson
+	   cholesky
+       lpc_passes
+	   Number of passes to use for Cholesky factorization during LPC
+	   analysis
+
+       min_partition_order
+	   The minimum partition order
+
+       max_partition_order
+	   The maximum partition order
+
+       prediction_order_method
+	   estimation
+	   2level
+	   4level
+	   8level
+	   search
+	       Bruteforce search
+
+	   log
+       ch_mode
+	   Channel mode
+
+	   auto
+	       The mode is chosen automatically for each frame
+
+	   indep
+	       Channels are independently coded
+
+	   left_side
+	   right_side
+	   mid_side
+       exact_rice_parameters
+	   Chooses if rice parameters are calculated exactly or approximately.
+	   if set to 1 then they are chosen exactly, which slows the code down
+	   slightly and improves compression slightly.
+
+       multi_dim_quant
+	   Multi Dimensional Quantization. If set to 1 then a 2nd stage LPC
+	   algorithm is applied after the first stage to finetune the
+	   coefficients. This is quite slow and slightly improves compression.
+
+   opus
+       Opus encoder.
+
+       This is a native FFmpeg encoder for the Opus format. Currently, it's in
+       development and only implements the CELT part of the codec. Its quality
+       is usually worse and at best is equal to the libopus encoder.
+
+       Options
+
+       b   Set bit rate in bits/s. If unspecified it uses the number of
+	   channels and the layout to make a good guess.
+
+       opus_delay
+	   Sets the maximum delay in milliseconds. Lower delays than 20ms will
+	   very quickly decrease quality.
+
+   libfdk_aac
+       libfdk-aac AAC (Advanced Audio Coding) encoder wrapper.
+
+       The libfdk-aac library is based on the Fraunhofer FDK AAC code from the
+       Android project.
+
+       Requires the presence of the libfdk-aac headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libfdk-aac". The library is also incompatible with GPL, so if
+       you allow the use of GPL, you should configure with "--enable-gpl
+       --enable-nonfree --enable-libfdk-aac".
+
+       This encoder has support for the AAC-HE profiles.
+
+       VBR encoding, enabled through the vbr or flags +qscale options, is
+       experimental and only works with some combinations of parameters.
+
+       Support for encoding 7.1 audio is only available with libfdk-aac 0.1.3
+       or higher.
+
+       For more information see the fdk-aac project at
+       <http://sourceforge.net/p/opencore-amr/fdk-aac/>.
+
+       Options
+
+       The following options are mapped on the shared FFmpeg codec options.
+
+       b   Set bit rate in bits/s. If the bitrate is not explicitly specified,
+	   it is automatically set to a suitable value depending on the
+	   selected profile.
+
+	   In case VBR mode is enabled the option is ignored.
+
+       ar  Set audio sampling rate (in Hz).
+
+       channels
+	   Set the number of audio channels.
+
+       flags +qscale
+	   Enable fixed quality, VBR (Variable Bit Rate) mode.	Note that VBR
+	   is implicitly enabled when the vbr value is positive.
+
+       cutoff
+	   Set cutoff frequency. If not specified (or explicitly set to 0) it
+	   will use a value automatically computed by the library. Default
+	   value is 0.
+
+       profile
+	   Set audio profile.
+
+	   The following profiles are recognized:
+
+	   aac_low
+	       Low Complexity AAC (LC)
+
+	   aac_he
+	       High Efficiency AAC (HE-AAC)
+
+	   aac_he_v2
+	       High Efficiency AAC version 2 (HE-AACv2)
+
+	   aac_ld
+	       Low Delay AAC (LD)
+
+	   aac_eld
+	       Enhanced Low Delay AAC (ELD)
+
+	   If not specified it is set to aac_low.
+
+       The following are private options of the libfdk_aac encoder.
+
+       afterburner
+	   Enable afterburner feature if set to 1, disabled if set to 0. This
+	   improves the quality but also the required processing power.
+
+	   Default value is 1.
+
+       eld_sbr
+	   Enable SBR (Spectral Band Replication) for ELD if set to 1,
+	   disabled if set to 0.
+
+	   Default value is 0.
+
+       eld_v2
+	   Enable ELDv2 (LD-MPS extension for ELD stereo signals) for ELDv2 if
+	   set to 1, disabled if set to 0.
+
+	   Note that option is available when fdk-aac version
+	   (AACENCODER_LIB_VL0.AACENCODER_LIB_VL1.AACENCODER_LIB_VL2) >
+	   (4.0.0).
+
+	   Default value is 0.
+
+       signaling
+	   Set SBR/PS signaling style.
+
+	   It can assume one of the following values:
+
+	   default
+	       choose signaling implicitly (explicit hierarchical by default,
+	       implicit if global header is disabled)
+
+	   implicit
+	       implicit backwards compatible signaling
+
+	   explicit_sbr
+	       explicit SBR, implicit PS signaling
+
+	   explicit_hierarchical
+	       explicit hierarchical signaling
+
+	   Default value is default.
+
+       latm
+	   Output LATM/LOAS encapsulated data if set to 1, disabled if set to
+	   0.
+
+	   Default value is 0.
+
+       header_period
+	   Set StreamMuxConfig and PCE repetition period (in frames) for
+	   sending in-band configuration buffers within LATM/LOAS transport
+	   layer.
+
+	   Must be a 16-bits non-negative integer.
+
+	   Default value is 0.
+
+       vbr Set VBR mode, from 1 to 5. 1 is lowest quality (though still pretty
+	   good) and 5 is highest quality. A value of 0 will disable VBR, and
+	   CBR (Constant Bit Rate) is enabled.
+
+	   Currently only the aac_low profile supports VBR encoding.
+
+	   VBR modes 1-5 correspond to roughly the following average bit
+	   rates:
+
+	   1   32 kbps/channel
+
+	   2   40 kbps/channel
+
+	   3   48-56 kbps/channel
+
+	   4   64 kbps/channel
+
+	   5   about 80-96 kbps/channel
+
+	   Default value is 0.
+
+       frame_length
+	   Set the audio frame length in samples. Default value is the
+	   internal default of the library. Refer to the library's
+	   documentation for information about supported values.
+
+       Examples
+
+       o   Use ffmpeg to convert an audio file to VBR AAC in an M4A (MP4)
+	   container:
+
+		   ffmpeg -i input.wav -codec:a libfdk_aac -vbr 3 output.m4a
+
+       o   Use ffmpeg to convert an audio file to CBR 64k kbps AAC, using the
+	   High-Efficiency AAC profile:
+
+		   ffmpeg -i input.wav -c:a libfdk_aac -profile:a aac_he -b:a 64k output.m4a
+
+   libmp3lame
+       LAME (Lame Ain't an MP3 Encoder) MP3 encoder wrapper.
+
+       Requires the presence of the libmp3lame headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libmp3lame".
+
+       See libshine for a fixed-point MP3 encoder, although with a lower
+       quality.
+
+       Options
+
+       The following options are supported by the libmp3lame wrapper. The
+       lame-equivalent of the options are listed in parentheses.
+
+       b (-b)
+	   Set bitrate expressed in bits/s for CBR or ABR. LAME "bitrate" is
+	   expressed in kilobits/s.
+
+       q (-V)
+	   Set constant quality setting for VBR. This option is valid only
+	   using the ffmpeg command-line tool. For library interface users,
+	   use global_quality.
+
+       compression_level (-q)
+	   Set algorithm quality. Valid arguments are integers in the 0-9
+	   range, with 0 meaning highest quality but slowest, and 9 meaning
+	   fastest while producing the worst quality.
+
+       cutoff (--lowpass)
+	   Set lowpass cutoff frequency. If unspecified, the encoder
+	   dynamically adjusts the cutoff.
+
+       reservoir
+	   Enable use of bit reservoir when set to 1. Default value is 1. LAME
+	   has this enabled by default, but can be overridden by use --nores
+	   option.
+
+       joint_stereo (-m j)
+	   Enable the encoder to use (on a frame by frame basis) either L/R
+	   stereo or mid/side stereo. Default value is 1.
+
+       abr (--abr)
+	   Enable the encoder to use ABR when set to 1. The lame --abr sets
+	   the target bitrate, while this options only tells FFmpeg to use ABR
+	   still relies on b to set bitrate.
+
+       copyright (-c)
+	   Set MPEG audio copyright flag when set to 1. The default value is 0
+	   (disabled).
+
+       original (-o)
+	   Set MPEG audio original flag when set to 1. The default value is 1
+	   (enabled).
+
+   libopencore-amrnb
+       OpenCORE Adaptive Multi-Rate Narrowband encoder.
+
+       Requires the presence of the libopencore-amrnb headers and library
+       during configuration. You need to explicitly configure the build with
+       "--enable-libopencore-amrnb --enable-version3".
+
+       This is a mono-only encoder. Officially it only supports 8000Hz sample
+       rate, but you can override it by setting strict to unofficial or lower.
+
+       Options
+
+       b   Set bitrate in bits per second. Only the following bitrates are
+	   supported, otherwise libavcodec will round to the nearest valid
+	   bitrate.
+
+	   4750
+	   5150
+	   5900
+	   6700
+	   7400
+	   7950
+	   10200
+	   12200
+       dtx Allow discontinuous transmission (generate comfort noise) when set
+	   to 1. The default value is 0 (disabled).
+
+   libopus
+       libopus Opus Interactive Audio Codec encoder wrapper.
+
+       Requires the presence of the libopus headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libopus".
+
+       Option Mapping
+
+       Most libopus options are modelled after the opusenc utility from opus-
+       tools. The following is an option mapping chart describing options
+       supported by the libopus wrapper, and their opusenc-equivalent in
+       parentheses.
+
+       b (bitrate)
+	   Set the bit rate in bits/s.	FFmpeg's b option is expressed in
+	   bits/s, while opusenc's bitrate in kilobits/s.
+
+       vbr (vbr, hard-cbr, and cvbr)
+	   Set VBR mode. The FFmpeg vbr option has the following valid
+	   arguments, with the opusenc equivalent options in parentheses:
+
+	   off (hard-cbr)
+	       Use constant bit rate encoding.
+
+	   on (vbr)
+	       Use variable bit rate encoding (the default).
+
+	   constrained (cvbr)
+	       Use constrained variable bit rate encoding.
+
+       compression_level (comp)
+	   Set encoding algorithm complexity. Valid options are integers in
+	   the 0-10 range. 0 gives the fastest encodes but lower quality,
+	   while 10 gives the highest quality but slowest encoding. The
+	   default is 10.
+
+       frame_duration (framesize)
+	   Set maximum frame size, or duration of a frame in milliseconds. The
+	   argument must be exactly the following: 2.5, 5, 10, 20, 40, 60.
+	   Smaller frame sizes achieve lower latency but less quality at a
+	   given bitrate.  Sizes greater than 20ms are only interesting at
+	   fairly low bitrates.  The default is 20ms.
+
+       packet_loss (expect-loss)
+	   Set expected packet loss percentage. The default is 0.
+
+       fec (n/a)
+	   Enable inband forward error correction. packet_loss must be non-
+	   zero to take advantage - frequency of FEC 'side-data' is
+	   proportional to expected packet loss.  Default is disabled.
+
+       application (N.A.)
+	   Set intended application type. Valid options are listed below:
+
+	   voip
+	       Favor improved speech intelligibility.
+
+	   audio
+	       Favor faithfulness to the input (the default).
+
+	   lowdelay
+	       Restrict to only the lowest delay modes by disabling voice-
+	       optimized modes.
+
+       cutoff (N.A.)
+	   Set cutoff bandwidth in Hz. The argument must be exactly one of the
+	   following: 4000, 6000, 8000, 12000, or 20000, corresponding to
+	   narrowband, mediumband, wideband, super wideband, and fullband
+	   respectively. The default is 0 (cutoff disabled). Note that libopus
+	   forces a wideband cutoff for bitrates < 15 kbps, unless CELT-only
+	   (application set to lowdelay) mode is used.
+
+       mapping_family (mapping_family)
+	   Set channel mapping family to be used by the encoder. The default
+	   value of -1 uses mapping family 0 for mono and stereo inputs, and
+	   mapping family 1 otherwise. The default also disables the surround
+	   masking and LFE bandwidth optimzations in libopus, and requires
+	   that the input contains 8 channels or fewer.
+
+	   Other values include 0 for mono and stereo, 1 for surround sound
+	   with masking and LFE bandwidth optimizations, and 255 for
+	   independent streams with an unspecified channel layout.
+
+       apply_phase_inv (N.A.) (requires libopus >= 1.2)
+	   If set to 0, disables the use of phase inversion for intensity
+	   stereo, improving the quality of mono downmixes, but slightly
+	   reducing normal stereo quality. The default is 1 (phase inversion
+	   enabled).
+
+   libshine
+       Shine Fixed-Point MP3 encoder wrapper.
+
+       Shine is a fixed-point MP3 encoder. It has a far better performance on
+       platforms without an FPU, e.g. armel CPUs, and some phones and tablets.
+       However, as it is more targeted on performance than quality, it is not
+       on par with LAME and other production-grade encoders quality-wise.
+       Also, according to the project's homepage, this encoder may not be free
+       of bugs as the code was written a long time ago and the project was
+       dead for at least 5 years.
+
+       This encoder only supports stereo and mono input. This is also CBR-
+       only.
+
+       The original project (last updated in early 2007) is at
+       <http://sourceforge.net/projects/libshine-fxp/>. We only support the
+       updated fork by the Savonet/Liquidsoap project at
+       <https://github.com/savonet/shine>.
+
+       Requires the presence of the libshine headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libshine".
+
+       See also libmp3lame.
+
+       Options
+
+       The following options are supported by the libshine wrapper. The
+       shineenc-equivalent of the options are listed in parentheses.
+
+       b (-b)
+	   Set bitrate expressed in bits/s for CBR. shineenc -b option is
+	   expressed in kilobits/s.
+
+   libtwolame
+       TwoLAME MP2 encoder wrapper.
+
+       Requires the presence of the libtwolame headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libtwolame".
+
+       Options
+
+       The following options are supported by the libtwolame wrapper. The
+       twolame-equivalent options follow the FFmpeg ones and are in
+       parentheses.
+
+       b (-b)
+	   Set bitrate expressed in bits/s for CBR. twolame b option is
+	   expressed in kilobits/s. Default value is 128k.
+
+       q (-V)
+	   Set quality for experimental VBR support. Maximum value range is
+	   from -50 to 50, useful range is from -10 to 10. The higher the
+	   value, the better the quality. This option is valid only using the
+	   ffmpeg command-line tool. For library interface users, use
+	   global_quality.
+
+       mode (--mode)
+	   Set the mode of the resulting audio. Possible values:
+
+	   auto
+	       Choose mode automatically based on the input. This is the
+	       default.
+
+	   stereo
+	       Stereo
+
+	   joint_stereo
+	       Joint stereo
+
+	   dual_channel
+	       Dual channel
+
+	   mono
+	       Mono
+
+       psymodel (--psyc-mode)
+	   Set psychoacoustic model to use in encoding. The argument must be
+	   an integer between -1 and 4, inclusive. The higher the value, the
+	   better the quality. The default value is 3.
+
+       energy_levels (--energy)
+	   Enable energy levels extensions when set to 1. The default value is
+	   0 (disabled).
+
+       error_protection (--protect)
+	   Enable CRC error protection when set to 1. The default value is 0
+	   (disabled).
+
+       copyright (--copyright)
+	   Set MPEG audio copyright flag when set to 1. The default value is 0
+	   (disabled).
+
+       original (--original)
+	   Set MPEG audio original flag when set to 1. The default value is 0
+	   (disabled).
+
+   libvo-amrwbenc
+       VisualOn Adaptive Multi-Rate Wideband encoder.
+
+       Requires the presence of the libvo-amrwbenc headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libvo-amrwbenc --enable-version3".
+
+       This is a mono-only encoder. Officially it only supports 16000Hz sample
+       rate, but you can override it by setting strict to unofficial or lower.
+
+       Options
+
+       b   Set bitrate in bits/s. Only the following bitrates are supported,
+	   otherwise libavcodec will round to the nearest valid bitrate.
+
+	   6600
+	   8850
+	   12650
+	   14250
+	   15850
+	   18250
+	   19850
+	   23050
+	   23850
+       dtx Allow discontinuous transmission (generate comfort noise) when set
+	   to 1. The default value is 0 (disabled).
+
+   libvorbis
+       libvorbis encoder wrapper.
+
+       Requires the presence of the libvorbisenc headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libvorbis".
+
+       Options
+
+       The following options are supported by the libvorbis wrapper. The
+       oggenc-equivalent of the options are listed in parentheses.
+
+       To get a more accurate and extensive documentation of the libvorbis
+       options, consult the libvorbisenc's and oggenc's documentations.  See
+       <http://xiph.org/vorbis/>, <http://wiki.xiph.org/Vorbis-tools>, and
+       oggenc(1).
+
+       b (-b)
+	   Set bitrate expressed in bits/s for ABR. oggenc -b is expressed in
+	   kilobits/s.
+
+       q (-q)
+	   Set constant quality setting for VBR. The value should be a float
+	   number in the range of -1.0 to 10.0. The higher the value, the
+	   better the quality. The default value is 3.0.
+
+	   This option is valid only using the ffmpeg command-line tool.  For
+	   library interface users, use global_quality.
+
+       cutoff (--advanced-encode-option lowpass_frequency=N)
+	   Set cutoff bandwidth in Hz, a value of 0 disables cutoff. oggenc's
+	   related option is expressed in kHz. The default value is 0 (cutoff
+	   disabled).
+
+       minrate (-m)
+	   Set minimum bitrate expressed in bits/s. oggenc -m is expressed in
+	   kilobits/s.
+
+       maxrate (-M)
+	   Set maximum bitrate expressed in bits/s. oggenc -M is expressed in
+	   kilobits/s. This only has effect on ABR mode.
+
+       iblock (--advanced-encode-option impulse_noisetune=N)
+	   Set noise floor bias for impulse blocks. The value is a float
+	   number from -15.0 to 0.0. A negative bias instructs the encoder to
+	   pay special attention to the crispness of transients in the encoded
+	   audio. The tradeoff for better transient response is a higher
+	   bitrate.
+
+   mjpeg
+       Motion JPEG encoder.
+
+       Options
+
+       huffman
+	   Set the huffman encoding strategy. Possible values:
+
+	   default
+	       Use the default huffman tables. This is the default strategy.
+
+	   optimal
+	       Compute and use optimal huffman tables.
+
+   wavpack
+       WavPack lossless audio encoder.
+
+       Options
+
+       The equivalent options for wavpack command line utility are listed in
+       parentheses.
+
+       Shared options
+
+       The following shared options are effective for this encoder. Only
+       special notes about this particular encoder will be documented here.
+       For the general meaning of the options, see the Codec Options chapter.
+
+       frame_size (--blocksize)
+	   For this encoder, the range for this option is between 128 and
+	   131072. Default is automatically decided based on sample rate and
+	   number of channel.
+
+	   For the complete formula of calculating default, see
+	   libavcodec/wavpackenc.c.
+
+       compression_level (-f, -h, -hh, and -x)
+
+       Private options
+
+       joint_stereo (-j)
+	   Set whether to enable joint stereo. Valid values are:
+
+	   on (1)
+	       Force mid/side audio encoding.
+
+	   off (0)
+	       Force left/right audio encoding.
+
+	   auto
+	       Let the encoder decide automatically.
+
+       optimize_mono
+	   Set whether to enable optimization for mono. This option is only
+	   effective for non-mono streams. Available values:
+
+	   on  enabled
+
+	   off disabled
+
+VIDEO ENCODERS
+       A description of some of the currently available video encoders
+       follows.
+
+   a64_multi, a64_multi5
+       A64 / Commodore 64 multicolor charset encoder. "a64_multi5" is extended
+       with 5th color (colram).
+
+   Cinepak
+       Cinepak aka CVID encoder.  Compatible with Windows 3.1 and vintage
+       MacOS.
+
+       Options
+
+       g integer
+	   Keyframe interval.  A keyframe is inserted at least every "-g"
+	   frames, sometimes sooner.
+
+       q:v integer
+	   Quality factor. Lower is better. Higher gives lower bitrate.  The
+	   following table lists bitrates when encoding akiyo_cif.y4m for
+	   various values of "-q:v" with "-g 100":
+
+	   "-q:v 1" 1918 kb/s
+	   "-q:v 2" 1735 kb/s
+	   "-q:v 4" 1500 kb/s
+	   "-q:v 10" 1041 kb/s
+	   "-q:v 20" 826 kb/s
+	   "-q:v 40" 553 kb/s
+	   "-q:v 100" 394 kb/s
+	   "-q:v 200" 312 kb/s
+	   "-q:v 400" 266 kb/s
+	   "-q:v 1000" 237 kb/s
+       max_extra_cb_iterations integer
+	   Max extra codebook recalculation passes, more is better and slower.
+
+       skip_empty_cb boolean
+	   Avoid wasting bytes, ignore vintage MacOS decoder.
+
+       max_strips integer
+       min_strips integer
+	   The minimum and maximum number of strips to use.  Wider range
+	   sometimes improves quality.	More strips is generally better
+	   quality but costs more bits.  Fewer strips tend to yield more
+	   keyframes.  Vintage compatible is 1..3.
+
+       strip_number_adaptivity integer
+	   How much number of strips is allowed to change between frames.
+	   Higher is better but slower.
+
+   GIF
+       GIF image/animation encoder.
+
+       Options
+
+       gifflags integer
+	   Sets the flags used for GIF encoding.
+
+	   offsetting
+	       Enables picture offsetting.
+
+	       Default is enabled.
+
+	   transdiff
+	       Enables transparency detection between frames.
+
+	       Default is enabled.
+
+       gifimage integer
+	   Enables encoding one full GIF image per frame, rather than an
+	   animated GIF.
+
+	   Default value is 0.
+
+       global_palette integer
+	   Writes a palette to the global GIF header where feasible.
+
+	   If disabled, every frame will always have a palette written, even
+	   if there is a global palette supplied.
+
+	   Default value is 1.
+
+   Hap
+       Vidvox Hap video encoder.
+
+       Options
+
+       format integer
+	   Specifies the Hap format to encode.
+
+	   hap
+	   hap_alpha
+	   hap_q
+
+	   Default value is hap.
+
+       chunks integer
+	   Specifies the number of chunks to split frames into, between 1 and
+	   64. This permits multithreaded decoding of large frames,
+	   potentially at the cost of data-rate. The encoder may modify this
+	   value to divide frames evenly.
+
+	   Default value is 1.
+
+       compressor integer
+	   Specifies the second-stage compressor to use. If set to none,
+	   chunks will be limited to 1, as chunked uncompressed frames offer
+	   no benefit.
+
+	   none
+	   snappy
+
+	   Default value is snappy.
+
+   jpeg2000
+       The native jpeg 2000 encoder is lossy by default, the "-q:v" option can
+       be used to set the encoding quality. Lossless encoding can be selected
+       with "-pred 1".
+
+       Options
+
+       format integer
+	   Can be set to either "j2k" or "jp2" (the default) that makes it
+	   possible to store non-rgb pix_fmts.
+
+       tile_width integer
+	   Sets tile width. Range is 1 to 1073741824. Default is 256.
+
+       tile_height integer
+	   Sets tile height. Range is 1 to 1073741824. Default is 256.
+
+       pred integer
+	   Allows setting the discrete wavelet transform (DWT) type
+
+	   dwt97int (Lossy)
+	   dwt53 (Lossless)
+
+	   Default is "dwt97int"
+
+       sop boolean
+	   Enable this to add SOP marker at the start of each packet. Disabled
+	   by default.
+
+       eph boolean
+	   Enable this to add EPH marker at the end of each packet header.
+	   Disabled by default.
+
+       prog integer
+	   Sets the progression order to be used by the encoder.  Possible
+	   values are:
+
+	   lrcp
+	   rlcp
+	   rpcl
+	   pcrl
+	   cprl
+
+	   Set to "lrcp" by default.
+
+       layer_rates string
+	   By default, when this option is not used, compression is done using
+	   the quality metric.	This option allows for compression using
+	   compression ratio. The compression ratio for each level could be
+	   specified. The compression ratio of a layer "l" species the what
+	   ratio of total file size is contained in the first "l" layers.
+
+	   Example usage:
+
+		   ffmpeg -i input.bmp -c:v jpeg2000 -layer_rates "100,10,1" output.j2k
+
+	   This would compress the image to contain 3 layers, where the data
+	   contained in the first layer would be compressed by 1000 times,
+	   compressed by 100 in the first two layers, and shall contain all
+	   data while using all 3 layers.
+
+   librav1e
+       rav1e AV1 encoder wrapper.
+
+       Requires the presence of the rav1e headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-librav1e".
+
+       Options
+
+       qmax
+	   Sets the maximum quantizer to use when using bitrate mode.
+
+       qmin
+	   Sets the minimum quantizer to use when using bitrate mode.
+
+       qp  Uses quantizer mode to encode at the given quantizer (0-255).
+
+       speed
+	   Selects the speed preset (0-10) to encode with.
+
+       tiles
+	   Selects how many tiles to encode with.
+
+       tile-rows
+	   Selects how many rows of tiles to encode with.
+
+       tile-columns
+	   Selects how many columns of tiles to encode with.
+
+       rav1e-params
+	   Set rav1e options using a list of key=value pairs separated by ":".
+	   See rav1e --help for a list of options.
+
+	   For example to specify librav1e encoding options with
+	   -rav1e-params:
+
+		   ffmpeg -i input -c:v librav1e -b:v 500K -rav1e-params speed=5:low_latency=true output.mp4
+
+   libaom-av1
+       libaom AV1 encoder wrapper.
+
+       Requires the presence of the libaom headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libaom".
+
+       Options
+
+       The wrapper supports the following standard libavcodec options:
+
+       b   Set bitrate target in bits/second.  By default this will use
+	   variable-bitrate mode.  If maxrate and minrate are also set to the
+	   same value then it will use constant-bitrate mode, otherwise if crf
+	   is set as well then it will use constrained-quality mode.
+
+       g keyint_min
+	   Set key frame placement.  The GOP size sets the maximum distance
+	   between key frames; if zero the output stream will be intra-only.
+	   The minimum distance is ignored unless it is the same as the GOP
+	   size, in which case key frames will always appear at a fixed
+	   interval.  Not set by default, so without this option the library
+	   has completely free choice about where to place key frames.
+
+       qmin qmax
+	   Set minimum/maximum quantisation values.  Valid range is from 0 to
+	   63 (warning: this does not match the quantiser values actually used
+	   by AV1 - divide by four to map real quantiser values to this
+	   range).  Defaults to min/max (no constraint).
+
+       minrate maxrate bufsize rc_init_occupancy
+	   Set rate control buffering parameters.  Not used if not set -
+	   defaults to unconstrained variable bitrate.
+
+       threads
+	   Set the number of threads to use while encoding.  This may require
+	   the tiles or row-mt options to also be set to actually use the
+	   specified number of threads fully. Defaults to the number of
+	   hardware threads supported by the host machine.
+
+       profile
+	   Set the encoding profile.  Defaults to using the profile which
+	   matches the bit depth and chroma subsampling of the input.
+
+       The wrapper also has some specific options:
+
+       cpu-used
+	   Set the quality/encoding speed tradeoff.  Valid range is from 0 to
+	   8, higher numbers indicating greater speed and lower quality.  The
+	   default value is 1, which will be slow and high quality.
+
+       auto-alt-ref
+	   Enable use of alternate reference frames.  Defaults to the internal
+	   default of the library.
+
+       arnr-max-frames (frames)
+	   Set altref noise reduction max frame count. Default is -1.
+
+       arnr-strength (strength)
+	   Set altref noise reduction filter strength. Range is -1 to 6.
+	   Default is -1.
+
+       aq-mode (aq-mode)
+	   Set adaptive quantization mode. Possible values:
+
+	   none (0)
+	       Disabled.
+
+	   variance (1)
+	       Variance-based.
+
+	   complexity (2)
+	       Complexity-based.
+
+	   cyclic (3)
+	       Cyclic refresh.
+
+       tune (tune)
+	   Set the distortion metric the encoder is tuned with. Default is
+	   "psnr".
+
+	   psnr (0)
+	   ssim (1)
+       lag-in-frames
+	   Set the maximum number of frames which the encoder may keep in
+	   flight at any one time for lookahead purposes.  Defaults to the
+	   internal default of the library.
+
+       error-resilience
+	   Enable error resilience features:
+
+	   default
+	       Improve resilience against losses of whole frames.
+
+	   Not enabled by default.
+
+       crf Set the quality/size tradeoff for constant-quality (no bitrate
+	   target) and constrained-quality (with maximum bitrate target)
+	   modes. Valid range is 0 to 63, higher numbers indicating lower
+	   quality and smaller output size.  Only used if set; by default only
+	   the bitrate target is used.
+
+       static-thresh
+	   Set a change threshold on blocks below which they will be skipped
+	   by the encoder.  Defined in arbitrary units as a nonnegative
+	   integer, defaulting to zero (no blocks are skipped).
+
+       drop-threshold
+	   Set a threshold for dropping frames when close to rate control
+	   bounds.  Defined as a percentage of the target buffer - when the
+	   rate control buffer falls below this percentage, frames will be
+	   dropped until it has refilled above the threshold.  Defaults to
+	   zero (no frames are dropped).
+
+       denoise-noise-level (level)
+	   Amount of noise to be removed for grain synthesis. Grain synthesis
+	   is disabled if this option is not set or set to 0.
+
+       denoise-block-size (pixels)
+	   Block size used for denoising for grain synthesis. If not set, AV1
+	   codec uses the default value of 32.
+
+       undershoot-pct (pct)
+	   Set datarate undershoot (min) percentage of the target bitrate.
+	   Range is -1 to 100.	Default is -1.
+
+       overshoot-pct (pct)
+	   Set datarate overshoot (max) percentage of the target bitrate.
+	   Range is -1 to 1000.  Default is -1.
+
+       minsection-pct (pct)
+	   Minimum percentage variation of the GOP bitrate from the target
+	   bitrate. If minsection-pct is not set, the libaomenc wrapper
+	   computes it as follows: "(minrate * 100 / bitrate)".  Range is -1
+	   to 100. Default is -1 (unset).
+
+       maxsection-pct (pct)
+	   Maximum percentage variation of the GOP bitrate from the target
+	   bitrate. If maxsection-pct is not set, the libaomenc wrapper
+	   computes it as follows: "(maxrate * 100 / bitrate)".  Range is -1
+	   to 5000. Default is -1 (unset).
+
+       frame-parallel (boolean)
+	   Enable frame parallel decodability features. Default is true.
+
+       tiles
+	   Set the number of tiles to encode the input video with, as columns
+	   x rows.  Larger numbers allow greater parallelism in both encoding
+	   and decoding, but may decrease coding efficiency.  Defaults to the
+	   minimum number of tiles required by the size of the input video
+	   (this is 1x1 (that is, a single tile) for sizes up to and including
+	   4K).
+
+       tile-columns tile-rows
+	   Set the number of tiles as log2 of the number of tile rows and
+	   columns.  Provided for compatibility with libvpx/VP9.
+
+       row-mt (Requires libaom >= 1.0.0-759-g90a15f4f2)
+	   Enable row based multi-threading. Disabled by default.
+
+       enable-cdef (boolean)
+	   Enable Constrained Directional Enhancement Filter. The libaom-av1
+	   encoder enables CDEF by default.
+
+       enable-restoration (boolean)
+	   Enable Loop Restoration Filter. Default is true for libaom-av1.
+
+       enable-global-motion (boolean)
+	   Enable the use of global motion for block prediction. Default is
+	   true.
+
+       enable-intrabc (boolean)
+	   Enable block copy mode for intra block prediction. This mode is
+	   useful for screen content. Default is true.
+
+       enable-rect-partitions (boolean) (Requires libaom >= v2.0.0)
+	   Enable rectangular partitions. Default is true.
+
+       enable-1to4-partitions (boolean) (Requires libaom >= v2.0.0)
+	   Enable 1:4/4:1 partitions. Default is true.
+
+       enable-ab-partitions (boolean) (Requires libaom >= v2.0.0)
+	   Enable AB shape partitions. Default is true.
+
+       enable-angle-delta (boolean) (Requires libaom >= v2.0.0)
+	   Enable angle delta intra prediction. Default is true.
+
+       enable-cfl-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable chroma predicted from luma intra prediction. Default is
+	   true.
+
+       enable-filter-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable filter intra predictor. Default is true.
+
+       enable-intra-edge-filter (boolean) (Requires libaom >= v2.0.0)
+	   Enable intra edge filter. Default is true.
+
+       enable-smooth-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable smooth intra prediction mode. Default is true.
+
+       enable-paeth-intra (boolean) (Requires libaom >= v2.0.0)
+	   Enable paeth predictor in intra prediction. Default is true.
+
+       enable-palette (boolean) (Requires libaom >= v2.0.0)
+	   Enable palette prediction mode. Default is true.
+
+       enable-flip-idtx (boolean) (Requires libaom >= v2.0.0)
+	   Enable extended transform type, including FLIPADST_DCT,
+	   DCT_FLIPADST, FLIPADST_FLIPADST, ADST_FLIPADST, FLIPADST_ADST,
+	   IDTX, V_DCT, H_DCT, V_ADST, H_ADST, V_FLIPADST, H_FLIPADST. Default
+	   is true.
+
+       enable-tx64 (boolean) (Requires libaom >= v2.0.0)
+	   Enable 64-pt transform. Default is true.
+
+       reduced-tx-type-set (boolean) (Requires libaom >= v2.0.0)
+	   Use reduced set of transform types. Default is false.
+
+       use-intra-dct-only (boolean) (Requires libaom >= v2.0.0)
+	   Use DCT only for INTRA modes. Default is false.
+
+       use-inter-dct-only (boolean) (Requires libaom >= v2.0.0)
+	   Use DCT only for INTER modes. Default is false.
+
+       use-intra-default-tx-only (boolean) (Requires libaom >= v2.0.0)
+	   Use Default-transform only for INTRA modes. Default is false.
+
+       enable-ref-frame-mvs (boolean) (Requires libaom >= v2.0.0)
+	   Enable temporal mv prediction. Default is true.
+
+       enable-reduced-reference-set (boolean) (Requires libaom >= v2.0.0)
+	   Use reduced set of single and compound references. Default is
+	   false.
+
+       enable-obmc (boolean) (Requires libaom >= v2.0.0)
+	   Enable obmc. Default is true.
+
+       enable-dual-filter (boolean) (Requires libaom >= v2.0.0)
+	   Enable dual filter. Default is true.
+
+       enable-diff-wtd-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable difference-weighted compound. Default is true.
+
+       enable-dist-wtd-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable distance-weighted compound. Default is true.
+
+       enable-onesided-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable one sided compound. Default is true.
+
+       enable-interinter-wedge (boolean) (Requires libaom >= v2.0.0)
+	   Enable interinter wedge compound. Default is true.
+
+       enable-interintra-wedge (boolean) (Requires libaom >= v2.0.0)
+	   Enable interintra wedge compound. Default is true.
+
+       enable-masked-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable masked compound. Default is true.
+
+       enable-interintra-comp (boolean) (Requires libaom >= v2.0.0)
+	   Enable interintra compound. Default is true.
+
+       enable-smooth-interintra (boolean) (Requires libaom >= v2.0.0)
+	   Enable smooth interintra mode. Default is true.
+
+       aom-params
+	   Set libaom options using a list of key=value pairs separated by
+	   ":". For a list of supported options, see aomenc --help under the
+	   section "AV1 Specific Options".
+
+	   For example to specify libaom encoding options with -aom-params:
+
+		   ffmpeg -i input -c:v libaom-av1 -b:v 500K -aom-params tune=psnr:enable-tpl-model=1 output.mp4
+
+   libsvtav1
+       SVT-AV1 encoder wrapper.
+
+       Requires the presence of the SVT-AV1 headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libsvtav1".
+
+       Options
+
+       profile
+	   Set the encoding profile.
+
+	   main
+	   high
+	   professional
+       level
+	   Set the operating point level. For example: '4.0'
+
+       hielevel
+	   Set the Hierarchical prediction levels.
+
+	   3level
+	   4level
+	       This is the default.
+
+       tier
+	   Set the operating point tier.
+
+	   main
+	       This is the default.
+
+	   high
+       qmax
+	   Set the maximum quantizer to use when using a bitrate mode.
+
+       qmin
+	   Set the minimum quantizer to use when using a bitrate mode.
+
+       crf Constant rate factor value used in crf rate control mode (0-63).
+
+       qp  Set the quantizer used in cqp rate control mode (0-63).
+
+       sc_detection
+	   Enable scene change detection.
+
+       la_depth
+	   Set number of frames to look ahead (0-120).
+
+       preset
+	   Set the quality-speed tradeoff, in the range 0 to 13.  Higher
+	   values are faster but lower quality.
+
+       tile_rows
+	   Set log2 of the number of rows of tiles to use (0-6).
+
+       tile_columns
+	   Set log2 of the number of columns of tiles to use (0-4).
+
+       svtav1-params
+	   Set SVT-AV1 options using a list of key=value pairs separated by
+	   ":". See the SVT-AV1 encoder user guide for a list of accepted
+	   parameters.
+
+   libjxl
+       libjxl JPEG XL encoder wrapper.
+
+       Requires the presence of the libjxl headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libjxl".
+
+       Options
+
+       The libjxl wrapper supports the following options:
+
+       distance
+	   Set the target Butteraugli distance. This is a quality setting:
+	   lower distance yields higher quality, with distance=1.0 roughly
+	   comparable to libjpeg Quality 90 for photographic content. Setting
+	   distance=0.0 yields true lossless encoding. Valid values range
+	   between 0.0 and 15.0, and sane values rarely exceed 5.0. Setting
+	   distance=0.1 usually attains transparency for most input. The
+	   default is 1.0.
+
+       effort
+	   Set the encoding effort used. Higher effort values produce more
+	   consistent quality and usually produces a better quality/bpp curve,
+	   at the cost of more CPU time required. Valid values range from 1 to
+	   9, and the default is 7.
+
+       modular
+	   Force the encoder to use Modular mode instead of choosing
+	   automatically. The default is to use VarDCT for lossy encoding and
+	   Modular for lossless. VarDCT is generally superior to Modular for
+	   lossy encoding but does not support lossless encoding.
+
+   libkvazaar
+       Kvazaar H.265/HEVC encoder.
+
+       Requires the presence of the libkvazaar headers and library during
+       configuration. You need to explicitly configure the build with
+       --enable-libkvazaar.
+
+       Options
+
+       b   Set target video bitrate in bit/s and enable rate control.
+
+       kvazaar-params
+	   Set kvazaar parameters as a list of name=value pairs separated by
+	   commas (,). See kvazaar documentation for a list of options.
+
+   libopenh264
+       Cisco libopenh264 H.264/MPEG-4 AVC encoder wrapper.
+
+       This encoder requires the presence of the libopenh264 headers and
+       library during configuration. You need to explicitly configure the
+       build with "--enable-libopenh264". The library is detected using pkg-
+       config.
+
+       For more information about the library see <http://www.openh264.org>.
+
+       Options
+
+       The following FFmpeg global options affect the configurations of the
+       libopenh264 encoder.
+
+       b   Set the bitrate (as a number of bits per second).
+
+       g   Set the GOP size.
+
+       maxrate
+	   Set the max bitrate (as a number of bits per second).
+
+       flags +global_header
+	   Set global header in the bitstream.
+
+       slices
+	   Set the number of slices, used in parallelized encoding. Default
+	   value is 0. This is only used when slice_mode is set to fixed.
+
+       loopfilter
+	   Enable loop filter, if set to 1 (automatically enabled). To disable
+	   set a value of 0.
+
+       profile
+	   Set profile restrictions. If set to the value of main enable CABAC
+	   (set the "SEncParamExt.iEntropyCodingModeFlag" flag to 1).
+
+       max_nal_size
+	   Set maximum NAL size in bytes.
+
+       allow_skip_frames
+	   Allow skipping frames to hit the target bitrate if set to 1.
+
+   libtheora
+       libtheora Theora encoder wrapper.
+
+       Requires the presence of the libtheora headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-libtheora".
+
+       For more information about the libtheora project see
+       <http://www.theora.org/>.
+
+       Options
+
+       The following global options are mapped to internal libtheora options
+       which affect the quality and the bitrate of the encoded stream.
+
+       b   Set the video bitrate in bit/s for CBR (Constant Bit Rate) mode.
+	   In case VBR (Variable Bit Rate) mode is enabled this option is
+	   ignored.
+
+       flags
+	   Used to enable constant quality mode (VBR) encoding through the
+	   qscale flag, and to enable the "pass1" and "pass2" modes.
+
+       g   Set the GOP size.
+
+       global_quality
+	   Set the global quality as an integer in lambda units.
+
+	   Only relevant when VBR mode is enabled with "flags +qscale". The
+	   value is converted to QP units by dividing it by "FF_QP2LAMBDA",
+	   clipped in the [0 - 10] range, and then multiplied by 6.3 to get a
+	   value in the native libtheora range [0-63]. A higher value
+	   corresponds to a higher quality.
+
+       q   Enable VBR mode when set to a non-negative value, and set constant
+	   quality value as a double floating point value in QP units.
+
+	   The value is clipped in the [0-10] range, and then multiplied by
+	   6.3 to get a value in the native libtheora range [0-63].
+
+	   This option is valid only using the ffmpeg command-line tool. For
+	   library interface users, use global_quality.
+
+       Examples
+
+       o   Set maximum constant quality (VBR) encoding with ffmpeg:
+
+		   ffmpeg -i INPUT -codec:v libtheora -q:v 10 OUTPUT.ogg
+
+       o   Use ffmpeg to convert a CBR 1000 kbps Theora video stream:
+
+		   ffmpeg -i INPUT -codec:v libtheora -b:v 1000k OUTPUT.ogg
+
+   libvpx
+       VP8/VP9 format supported through libvpx.
+
+       Requires the presence of the libvpx headers and library during
+       configuration.  You need to explicitly configure the build with
+       "--enable-libvpx".
+
+       Options
+
+       The following options are supported by the libvpx wrapper. The
+       vpxenc-equivalent options or values are listed in parentheses for easy
+       migration.
+
+       To reduce the duplication of documentation, only the private options
+       and some others requiring special attention are documented here. For
+       the documentation of the undocumented generic options, see the Codec
+       Options chapter.
+
+       To get more documentation of the libvpx options, invoke the command
+       ffmpeg -h encoder=libvpx, ffmpeg -h encoder=libvpx-vp9 or vpxenc
+       --help. Further information is available in the libvpx API
+       documentation.
+
+       b (target-bitrate)
+	   Set bitrate in bits/s. Note that FFmpeg's b option is expressed in
+	   bits/s, while vpxenc's target-bitrate is in kilobits/s.
+
+       g (kf-max-dist)
+       keyint_min (kf-min-dist)
+       qmin (min-q)
+	   Minimum (Best Quality) Quantizer.
+
+       qmax (max-q)
+	   Maximum (Worst Quality) Quantizer.  Can be changed per-frame.
+
+       bufsize (buf-sz, buf-optimal-sz)
+	   Set ratecontrol buffer size (in bits). Note vpxenc's options are
+	   specified in milliseconds, the libvpx wrapper converts this value
+	   as follows: "buf-sz = bufsize * 1000 / bitrate", "buf-optimal-sz =
+	   bufsize * 1000 / bitrate * 5 / 6".
+
+       rc_init_occupancy (buf-initial-sz)
+	   Set number of bits which should be loaded into the rc buffer before
+	   decoding starts. Note vpxenc's option is specified in milliseconds,
+	   the libvpx wrapper converts this value as follows:
+	   "rc_init_occupancy * 1000 / bitrate".
+
+       undershoot-pct
+	   Set datarate undershoot (min) percentage of the target bitrate.
+
+       overshoot-pct
+	   Set datarate overshoot (max) percentage of the target bitrate.
+
+       skip_threshold (drop-frame)
+       qcomp (bias-pct)
+       maxrate (maxsection-pct)
+	   Set GOP max bitrate in bits/s. Note vpxenc's option is specified as
+	   a percentage of the target bitrate, the libvpx wrapper converts
+	   this value as follows: "(maxrate * 100 / bitrate)".
+
+       minrate (minsection-pct)
+	   Set GOP min bitrate in bits/s. Note vpxenc's option is specified as
+	   a percentage of the target bitrate, the libvpx wrapper converts
+	   this value as follows: "(minrate * 100 / bitrate)".
+
+       minrate, maxrate, b end-usage=cbr
+	   "(minrate == maxrate == bitrate)".
+
+       crf (end-usage=cq, cq-level)
+       tune (tune)
+	   psnr (psnr)
+	   ssim (ssim)
+       quality, deadline (deadline)
+	   best
+	       Use best quality deadline. Poorly named and quite slow, this
+	       option should be avoided as it may give worse quality output
+	       than good.
+
+	   good
+	       Use good quality deadline. This is a good trade-off between
+	       speed and quality when used with the cpu-used option.
+
+	   realtime
+	       Use realtime quality deadline.
+
+       speed, cpu-used (cpu-used)
+	   Set quality/speed ratio modifier. Higher values speed up the encode
+	   at the cost of quality.
+
+       nr (noise-sensitivity)
+       static-thresh
+	   Set a change threshold on blocks below which they will be skipped
+	   by the encoder.
+
+       slices (token-parts)
+	   Note that FFmpeg's slices option gives the total number of
+	   partitions, while vpxenc's token-parts is given as
+	   "log2(partitions)".
+
+       max-intra-rate
+	   Set maximum I-frame bitrate as a percentage of the target bitrate.
+	   A value of 0 means unlimited.
+
+       force_key_frames
+	   "VPX_EFLAG_FORCE_KF"
+
+       Alternate reference frame related
+	   auto-alt-ref
+	       Enable use of alternate reference frames (2-pass only).	Values
+	       greater than 1 enable multi-layer alternate reference frames
+	       (VP9 only).
+
+	   arnr-maxframes
+	       Set altref noise reduction max frame count.
+
+	   arnr-type
+	       Set altref noise reduction filter type: backward, forward,
+	       centered.
+
+	   arnr-strength
+	       Set altref noise reduction filter strength.
+
+	   rc-lookahead, lag-in-frames (lag-in-frames)
+	       Set number of frames to look ahead for frametype and
+	       ratecontrol.
+
+	   min-gf-interval
+	       Set minimum golden/alternate reference frame interval (VP9
+	       only).
+
+       error-resilient
+	   Enable error resiliency features.
+
+       sharpness integer
+	   Increase sharpness at the expense of lower PSNR.  The valid range
+	   is [0, 7].
+
+       ts-parameters
+	   Sets the temporal scalability configuration using a :-separated
+	   list of key=value pairs. For example, to specify temporal
+	   scalability parameters with "ffmpeg":
+
+		   ffmpeg -i INPUT -c:v libvpx -ts-parameters ts_number_layers=3:\
+		   ts_target_bitrate=250,500,1000:ts_rate_decimator=4,2,1:\
+		   ts_periodicity=4:ts_layer_id=0,2,1,2:ts_layering_mode=3 OUTPUT
+
+	   Below is a brief explanation of each of the parameters, please
+	   refer to "struct vpx_codec_enc_cfg" in "vpx/vpx_encoder.h" for more
+	   details.
+
+	   ts_number_layers
+	       Number of temporal coding layers.
+
+	   ts_target_bitrate
+	       Target bitrate for each temporal layer (in kbps).  (bitrate
+	       should be inclusive of the lower temporal layer).
+
+	   ts_rate_decimator
+	       Frame rate decimation factor for each temporal layer.
+
+	   ts_periodicity
+	       Length of the sequence defining frame temporal layer
+	       membership.
+
+	   ts_layer_id
+	       Template defining the membership of frames to temporal layers.
+
+	   ts_layering_mode
+	       (optional) Selecting the temporal structure from a set of pre-
+	       defined temporal layering modes.  Currently supports the
+	       following options.
+
+	       0   No temporal layering flags are provided internally, relies
+		   on flags being passed in using "metadata" field in
+		   "AVFrame" with following keys.
+
+		   vp8-flags
+		       Sets the flags passed into the encoder to indicate the
+		       referencing scheme for the current frame.  Refer to
+		       function "vpx_codec_encode" in "vpx/vpx_encoder.h" for
+		       more details.
+
+		   temporal_id
+		       Explicitly sets the temporal id of the current frame to
+		       encode.
+
+	       2   Two temporal layers. 0-1...
+
+	       3   Three temporal layers. 0-2-1-2...; with single reference
+		   frame.
+
+	       4   Same as option "3", except there is a dependency between
+		   the two temporal layer 2 frames within the temporal period.
+
+       VP8-specific options
+	   screen-content-mode
+	       Screen content mode, one of: 0 (off), 1 (screen), 2 (screen
+	       with more aggressive rate control).
+
+       VP9-specific options
+	   lossless
+	       Enable lossless mode.
+
+	   tile-columns
+	       Set number of tile columns to use. Note this is given as
+	       "log2(tile_columns)". For example, 8 tile columns would be
+	       requested by setting the tile-columns option to 3.
+
+	   tile-rows
+	       Set number of tile rows to use. Note this is given as
+	       "log2(tile_rows)".  For example, 4 tile rows would be requested
+	       by setting the tile-rows option to 2.
+
+	   frame-parallel
+	       Enable frame parallel decodability features.
+
+	   aq-mode
+	       Set adaptive quantization mode (0: off (default), 1: variance
+	       2: complexity, 3: cyclic refresh, 4: equator360).
+
+	   colorspace color-space
+	       Set input color space. The VP9 bitstream supports signaling the
+	       following colorspaces:
+
+	       rgb sRGB
+	       bt709 bt709
+	       unspecified unknown
+	       bt470bg bt601
+	       smpte170m smpte170
+	       smpte240m smpte240
+	       bt2020_ncl bt2020
+	   row-mt boolean
+	       Enable row based multi-threading.
+
+	   tune-content
+	       Set content type: default (0), screen (1), film (2).
+
+	   corpus-complexity
+	       Corpus VBR mode is a variant of standard VBR where the
+	       complexity distribution midpoint is passed in rather than
+	       calculated for a specific clip or chunk.
+
+	       The valid range is [0, 10000]. 0 (default) uses standard VBR.
+
+	   enable-tpl boolean
+	       Enable temporal dependency model.
+
+	   ref-frame-config
+	       Using per-frame metadata, set members of the structure
+	       "vpx_svc_ref_frame_config_t" in "vpx/vp8cx.h" to fine-control
+	       referencing schemes and frame buffer management.  Use a
+	       :-separated list of key=value pairs.  For example,
+
+		       av_dict_set(&av_frame->metadata, "ref-frame-config", \
+		       "rfc_update_buffer_slot=7:rfc_lst_fb_idx=0:rfc_gld_fb_idx=1:rfc_alt_fb_idx=2:rfc_reference_last=0:rfc_reference_golden=0:rfc_reference_alt_ref=0");
+
+	       rfc_update_buffer_slot
+		   Indicates the buffer slot number to update
+
+	       rfc_update_last
+		   Indicates whether to update the LAST frame
+
+	       rfc_update_golden
+		   Indicates whether to update GOLDEN frame
+
+	       rfc_update_alt_ref
+		   Indicates whether to update ALT_REF frame
+
+	       rfc_lst_fb_idx
+		   LAST frame buffer index
+
+	       rfc_gld_fb_idx
+		   GOLDEN frame buffer index
+
+	       rfc_alt_fb_idx
+		   ALT_REF frame buffer index
+
+	       rfc_reference_last
+		   Indicates whether to reference LAST frame
+
+	       rfc_reference_golden
+		   Indicates whether to reference GOLDEN frame
+
+	       rfc_reference_alt_ref
+		   Indicates whether to reference ALT_REF frame
+
+	       rfc_reference_duration
+		   Indicates frame duration
+
+       For more information about libvpx see: <http://www.webmproject.org/>
+
+   libwebp
+       libwebp WebP Image encoder wrapper
+
+       libwebp is Google's official encoder for WebP images. It can encode in
+       either lossy or lossless mode. Lossy images are essentially a wrapper
+       around a VP8 frame. Lossless images are a separate codec developed by
+       Google.
+
+       Pixel Format
+
+       Currently, libwebp only supports YUV420 for lossy and RGB for lossless
+       due to limitations of the format and libwebp. Alpha is supported for
+       either mode.  Because of API limitations, if RGB is passed in when
+       encoding lossy or YUV is passed in for encoding lossless, the pixel
+       format will automatically be converted using functions from libwebp.
+       This is not ideal and is done only for convenience.
+
+       Options
+
+       -lossless boolean
+	   Enables/Disables use of lossless mode. Default is 0.
+
+       -compression_level integer
+	   For lossy, this is a quality/speed tradeoff. Higher values give
+	   better quality for a given size at the cost of increased encoding
+	   time. For lossless, this is a size/speed tradeoff. Higher values
+	   give smaller size at the cost of increased encoding time. More
+	   specifically, it controls the number of extra algorithms and
+	   compression tools used, and varies the combination of these tools.
+	   This maps to the method option in libwebp. The valid range is 0 to
+	   6.  Default is 4.
+
+       -quality float
+	   For lossy encoding, this controls image quality. For lossless
+	   encoding, this controls the effort and time spent in compression.
+	   Range is 0 to 100. Default is 75.
+
+       -preset type
+	   Configuration preset. This does some automatic settings based on
+	   the general type of the image.
+
+	   none
+	       Do not use a preset.
+
+	   default
+	       Use the encoder default.
+
+	   picture
+	       Digital picture, like portrait, inner shot
+
+	   photo
+	       Outdoor photograph, with natural lighting
+
+	   drawing
+	       Hand or line drawing, with high-contrast details
+
+	   icon
+	       Small-sized colorful images
+
+	   text
+	       Text-like
+
+   libx264, libx264rgb
+       x264 H.264/MPEG-4 AVC encoder wrapper.
+
+       This encoder requires the presence of the libx264 headers and library
+       during configuration. You need to explicitly configure the build with
+       "--enable-libx264".
+
+       libx264 supports an impressive number of features, including 8x8 and
+       4x4 adaptive spatial transform, adaptive B-frame placement, CAVLC/CABAC
+       entropy coding, interlacing (MBAFF), lossless mode, psy optimizations
+       for detail retention (adaptive quantization, psy-RD, psy-trellis).
+
+       Many libx264 encoder options are mapped to FFmpeg global codec options,
+       while unique encoder options are provided through private options.
+       Additionally the x264opts and x264-params private options allows one to
+       pass a list of key=value tuples as accepted by the libx264
+       "x264_param_parse" function.
+
+       The x264 project website is at
+       <http://www.videolan.org/developers/x264.html>.
+
+       The libx264rgb encoder is the same as libx264, except it accepts packed
+       RGB pixel formats as input instead of YUV.
+
+       Supported Pixel Formats
+
+       x264 supports 8- to 10-bit color spaces. The exact bit depth is
+       controlled at x264's configure time.
+
+       Options
+
+       The following options are supported by the libx264 wrapper. The
+       x264-equivalent options or values are listed in parentheses for easy
+       migration.
+
+       To reduce the duplication of documentation, only the private options
+       and some others requiring special attention are documented here. For
+       the documentation of the undocumented generic options, see the Codec
+       Options chapter.
+
+       To get a more accurate and extensive documentation of the libx264
+       options, invoke the command x264 --fullhelp or consult the libx264
+       documentation.
+
+       In the list below, note that the x264 option name is shown in
+       parentheses after the libavcodec corresponding name, in case there is a
+       direct mapping.
+
+       b (bitrate)
+	   Set bitrate in bits/s. Note that FFmpeg's b option is expressed in
+	   bits/s, while x264's bitrate is in kilobits/s.
+
+       bf (bframes)
+	   Number of B-frames between I and P-frames
+
+       g (keyint)
+	   Maximum GOP size
+
+       qmin (qpmin)
+	   Minimum quantizer scale
+
+       qmax (qpmax)
+	   Maximum quantizer scale
+
+       qdiff (qpstep)
+	   Maximum difference between quantizer scales
+
+       qblur (qblur)
+	   Quantizer curve blur
+
+       qcomp (qcomp)
+	   Quantizer curve compression factor
+
+       refs (ref)
+	   Number of reference frames each P-frame can use. The range is 0-16.
+
+       level (level)
+	   Set the "x264_param_t.i_level_idc" value in case the value is
+	   positive, it is ignored otherwise.
+
+	   This value can be set using the "AVCodecContext" API (e.g. by
+	   setting the "AVCodecContext" value directly), and is specified as
+	   an integer mapped on a corresponding level (e.g. the value 31 maps
+	   to H.264 level IDC "3.1", as defined in the "x264_levels" table).
+	   It is ignored when set to a non positive value.
+
+	   Alternatively it can be set as a private option, overriding the
+	   value set in "AVCodecContext", and in this case must be specified
+	   as the level IDC identifier (e.g. "3.1"), as defined by H.264 Annex
+	   A.
+
+       sc_threshold (scenecut)
+	   Sets the threshold for the scene change detection.
+
+       trellis (trellis)
+	   Performs Trellis quantization to increase efficiency. Enabled by
+	   default.
+
+       nr (nr)
+	   Noise reduction
+
+       me_range (merange)
+	   Maximum range of the motion search in pixels.
+
+       me_method (me)
+	   Set motion estimation method. Possible values in the decreasing
+	   order of speed:
+
+	   dia (dia)
+	   epzs (dia)
+	       Diamond search with radius 1 (fastest). epzs is an alias for
+	       dia.
+
+	   hex (hex)
+	       Hexagonal search with radius 2.
+
+	   umh (umh)
+	       Uneven multi-hexagon search.
+
+	   esa (esa)
+	       Exhaustive search.
+
+	   tesa (tesa)
+	       Hadamard exhaustive search (slowest).
+
+       forced-idr
+	   Normally, when forcing a I-frame type, the encoder can select any
+	   type of I-frame. This option forces it to choose an IDR-frame.
+
+       subq (subme)
+	   Sub-pixel motion estimation method.
+
+       b_strategy (b-adapt)
+	   Adaptive B-frame placement decision algorithm. Use only on first-
+	   pass.
+
+       keyint_min (min-keyint)
+	   Minimum GOP size.
+
+       coder
+	   Set entropy encoder. Possible values:
+
+	   ac  Enable CABAC.
+
+	   vlc Enable CAVLC and disable CABAC. It generates the same effect as
+	       x264's --no-cabac option.
+
+       cmp Set full pixel motion estimation comparison algorithm. Possible
+	   values:
+
+	   chroma
+	       Enable chroma in motion estimation.
+
+	   sad Ignore chroma in motion estimation. It generates the same
+	       effect as x264's --no-chroma-me option.
+
+       threads (threads)
+	   Number of encoding threads.
+
+       thread_type
+	   Set multithreading technique. Possible values:
+
+	   slice
+	       Slice-based multithreading. It generates the same effect as
+	       x264's --sliced-threads option.
+
+	   frame
+	       Frame-based multithreading.
+
+       flags
+	   Set encoding flags. It can be used to disable closed GOP and enable
+	   open GOP by setting it to "-cgop". The result is similar to the
+	   behavior of x264's --open-gop option.
+
+       rc_init_occupancy (vbv-init)
+	   Initial VBV buffer occupancy
+
+       preset (preset)
+	   Set the encoding preset.
+
+       tune (tune)
+	   Set tuning of the encoding params.
+
+       profile (profile)
+	   Set profile restrictions.
+
+       fastfirstpass
+	   Enable fast settings when encoding first pass, when set to 1. When
+	   set to 0, it has the same effect of x264's --slow-firstpass option.
+
+       crf (crf)
+	   Set the quality for constant quality mode.
+
+       crf_max (crf-max)
+	   In CRF mode, prevents VBV from lowering quality beyond this point.
+
+       qp (qp)
+	   Set constant quantization rate control method parameter.
+
+       aq-mode (aq-mode)
+	   Set AQ method. Possible values:
+
+	   none (0)
+	       Disabled.
+
+	   variance (1)
+	       Variance AQ (complexity mask).
+
+	   autovariance (2)
+	       Auto-variance AQ (experimental).
+
+       aq-strength (aq-strength)
+	   Set AQ strength, reduce blocking and blurring in flat and textured
+	   areas.
+
+       psy Use psychovisual optimizations when set to 1. When set to 0, it has
+	   the same effect as x264's --no-psy option.
+
+       psy-rd (psy-rd)
+	   Set strength of psychovisual optimization, in psy-rd:psy-trellis
+	   format.
+
+       rc-lookahead (rc-lookahead)
+	   Set number of frames to look ahead for frametype and ratecontrol.
+
+       weightb
+	   Enable weighted prediction for B-frames when set to 1. When set to
+	   0, it has the same effect as x264's --no-weightb option.
+
+       weightp (weightp)
+	   Set weighted prediction method for P-frames. Possible values:
+
+	   none (0)
+	       Disabled
+
+	   simple (1)
+	       Enable only weighted refs
+
+	   smart (2)
+	       Enable both weighted refs and duplicates
+
+       ssim (ssim)
+	   Enable calculation and printing SSIM stats after the encoding.
+
+       intra-refresh (intra-refresh)
+	   Enable the use of Periodic Intra Refresh instead of IDR frames when
+	   set to 1.
+
+       avcintra-class (class)
+	   Configure the encoder to generate AVC-Intra.  Valid values are 50,
+	   100 and 200
+
+       bluray-compat (bluray-compat)
+	   Configure the encoder to be compatible with the bluray standard.
+	   It is a shorthand for setting "bluray-compat=1 force-cfr=1".
+
+       b-bias (b-bias)
+	   Set the influence on how often B-frames are used.
+
+       b-pyramid (b-pyramid)
+	   Set method for keeping of some B-frames as references. Possible
+	   values:
+
+	   none (none)
+	       Disabled.
+
+	   strict (strict)
+	       Strictly hierarchical pyramid.
+
+	   normal (normal)
+	       Non-strict (not Blu-ray compatible).
+
+       mixed-refs
+	   Enable the use of one reference per partition, as opposed to one
+	   reference per macroblock when set to 1. When set to 0, it has the
+	   same effect as x264's --no-mixed-refs option.
+
+       8x8dct
+	   Enable adaptive spatial transform (high profile 8x8 transform) when
+	   set to 1. When set to 0, it has the same effect as x264's
+	   --no-8x8dct option.
+
+       fast-pskip
+	   Enable early SKIP detection on P-frames when set to 1. When set to
+	   0, it has the same effect as x264's --no-fast-pskip option.
+
+       aud (aud)
+	   Enable use of access unit delimiters when set to 1.
+
+       mbtree
+	   Enable use macroblock tree ratecontrol when set to 1. When set to
+	   0, it has the same effect as x264's --no-mbtree option.
+
+       deblock (deblock)
+	   Set loop filter parameters, in alpha:beta form.
+
+       cplxblur (cplxblur)
+	   Set fluctuations reduction in QP (before curve compression).
+
+       partitions (partitions)
+	   Set partitions to consider as a comma-separated list of values.
+	   Possible values in the list:
+
+	   p8x8
+	       8x8 P-frame partition.
+
+	   p4x4
+	       4x4 P-frame partition.
+
+	   b8x8
+	       4x4 B-frame partition.
+
+	   i8x8
+	       8x8 I-frame partition.
+
+	   i4x4
+	       4x4 I-frame partition.  (Enabling p4x4 requires p8x8 to be
+	       enabled. Enabling i8x8 requires adaptive spatial transform
+	       (8x8dct option) to be enabled.)
+
+	   none (none)
+	       Do not consider any partitions.
+
+	   all (all)
+	       Consider every partition.
+
+       direct-pred (direct)
+	   Set direct MV prediction mode. Possible values:
+
+	   none (none)
+	       Disable MV prediction.
+
+	   spatial (spatial)
+	       Enable spatial predicting.
+
+	   temporal (temporal)
+	       Enable temporal predicting.
+
+	   auto (auto)
+	       Automatically decided.
+
+       slice-max-size (slice-max-size)
+	   Set the limit of the size of each slice in bytes. If not specified
+	   but RTP payload size (ps) is specified, that is used.
+
+       stats (stats)
+	   Set the file name for multi-pass stats.
+
+       nal-hrd (nal-hrd)
+	   Set signal HRD information (requires vbv-bufsize to be set).
+	   Possible values:
+
+	   none (none)
+	       Disable HRD information signaling.
+
+	   vbr (vbr)
+	       Variable bit rate.
+
+	   cbr (cbr)
+	       Constant bit rate (not allowed in MP4 container).
+
+       x264opts opts
+       x264-params opts
+	   Override the x264 configuration using a :-separated list of
+	   key=value options.
+
+	   The argument for both options is a list of key=value couples
+	   separated by ":". With x264opts the value can be omitted, and the
+	   value 1 is assumed in that case.
+
+	   For filter and psy-rd options values that use ":" as a separator
+	   themselves, use "," instead. They accept it as well since long ago
+	   but this is kept undocumented for some reason.
+
+	   For example, the options might be provided as:
+
+		   level=30:bframes=0:weightp=0:cabac=0:ref=1:vbv-maxrate=768:vbv-bufsize=2000:analyse=all:me=umh:no-fast-pskip=1:subq=6:8x8dct=0:trellis=0
+
+	   For example to specify libx264 encoding options with ffmpeg:
+
+		   ffmpeg -i foo.mpg -c:v libx264 -x264opts keyint=123:min-keyint=20 -an out.mkv
+
+	   To get the complete list of the libx264 options, invoke the command
+	   x264 --fullhelp or consult the libx264 documentation.
+
+       a53cc boolean
+	   Import closed captions (which must be ATSC compatible format) into
+	   output.  Only the mpeg2 and h264 decoders provide these. Default is
+	   1 (on).
+
+       udu_sei boolean
+	   Import user data unregistered SEI if available into output. Default
+	   is 0 (off).
+
+       mb_info boolean
+	   Set mb_info data through AVFrameSideData, only useful when used
+	   from the API. Default is 0 (off).
+
+       Encoding ffpresets for common usages are provided so they can be used
+       with the general presets system (e.g. passing the pre option).
+
+   libx265
+       x265 H.265/HEVC encoder wrapper.
+
+       This encoder requires the presence of the libx265 headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libx265.
+
+       Options
+
+       b   Sets target video bitrate.
+
+       bf
+       g   Set the GOP size.
+
+       keyint_min
+	   Minimum GOP size.
+
+       refs
+	   Number of reference frames each P-frame can use. The range is from
+	   1-16.
+
+       preset
+	   Set the x265 preset.
+
+       tune
+	   Set the x265 tune parameter.
+
+       profile
+	   Set profile restrictions.
+
+       crf Set the quality for constant quality mode.
+
+       qp  Set constant quantization rate control method parameter.
+
+       qmin
+	   Minimum quantizer scale.
+
+       qmax
+	   Maximum quantizer scale.
+
+       qdiff
+	   Maximum difference between quantizer scales.
+
+       qblur
+	   Quantizer curve blur
+
+       qcomp
+	   Quantizer curve compression factor
+
+       i_qfactor
+       b_qfactor
+       forced-idr
+	   Normally, when forcing a I-frame type, the encoder can select any
+	   type of I-frame. This option forces it to choose an IDR-frame.
+
+       udu_sei boolean
+	   Import user data unregistered SEI if available into output. Default
+	   is 0 (off).
+
+       x265-params
+	   Set x265 options using a list of key=value couples separated by
+	   ":". See x265 --help for a list of options.
+
+	   For example to specify libx265 encoding options with -x265-params:
+
+		   ffmpeg -i input -c:v libx265 -x265-params crf=26:psy-rd=1 output.mp4
+
+   libxavs2
+       xavs2 AVS2-P2/IEEE1857.4 encoder wrapper.
+
+       This encoder requires the presence of the libxavs2 headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libxavs2.
+
+       The following standard libavcodec options are used:
+
+       o   b / bit_rate
+
+       o   g / gop_size
+
+       o   bf / max_b_frames
+
+       The encoder also has its own specific options:
+
+       Options
+
+       lcu_row_threads
+	   Set the number of parallel threads for rows from 1 to 8 (default
+	   5).
+
+       initial_qp
+	   Set the xavs2 quantization parameter from 1 to 63 (default 34).
+	   This is used to set the initial qp for the first frame.
+
+       qp  Set the xavs2 quantization parameter from 1 to 63 (default 34).
+	   This is used to set the qp value under constant-QP mode.
+
+       max_qp
+	   Set the max qp for rate control from 1 to 63 (default 55).
+
+       min_qp
+	   Set the min qp for rate control from 1 to 63 (default 20).
+
+       speed_level
+	   Set the Speed level from 0 to 9 (default 0). Higher is better but
+	   slower.
+
+       log_level
+	   Set the log level from -1 to 3 (default 0). -1: none, 0: error, 1:
+	   warning, 2: info, 3: debug.
+
+       xavs2-params
+	   Set xavs2 options using a list of key=value couples separated by
+	   ":".
+
+	   For example to specify libxavs2 encoding options with
+	   -xavs2-params:
+
+		   ffmpeg -i input -c:v libxavs2 -xavs2-params RdoqLevel=0 output.avs2
+
+   libxeve
+       eXtra-fast Essential Video Encoder (XEVE) MPEG-5 EVC encoder wrapper.
+       The xeve-equivalent options or values are listed in parentheses for
+       easy migration.
+
+       This encoder requires the presence of the libxeve headers and library
+       during configuration. You need to explicitly configure the build with
+       --enable-libxeve.
+
+	   Many libxeve encoder options are mapped to FFmpeg global codec
+	   options, while unique encoder options are provided through private
+	   options.  Additionally the xeve-params private options allows one
+	   to pass a list of key=value tuples as accepted by the libxeve
+	   "parse_xeve_params" function.
+
+       The xeve project website is at <https://github.com/mpeg5/xeve>.
+
+       Options
+
+       The following options are supported by the libxeve wrapper.  The xeve-
+       equivalent options or values are listed in parentheses for easy
+       migration.
+
+	   To reduce the duplication of documentation, only the private
+	   options and some others requiring special attention are documented
+	   here. For the documentation of the undocumented generic options,
+	   see the Codec Options chapter.
+
+	   To get a more accurate and extensive documentation of the libxeve
+	   options, invoke the command	"xeve_app --help" or consult the
+	   libxeve documentation.
+
+       b (bitrate)
+	   Set target video bitrate in bits/s.	Note that FFmpeg's b option is
+	   expressed in bits/s, while xeve's bitrate is in kilobits/s.
+
+       bf (bframes)
+	   Set the maximum number of B frames (1,3,7,15).
+
+       g (keyint)
+	   Set the GOP size (I-picture period).
+
+       preset (preset)
+	   Set the xeve preset.  Set the encoder preset value to determine
+	   encoding speed [fast, medium, slow, placebo]
+
+       tune (tune)
+	   Set the encoder tune parameter [psnr, zerolatency]
+
+       profile (profile)
+	   Set the encoder profile [0: baseline; 1: main]
+
+       crf (crf)
+	   Set the quality for constant quality mode.  Constant rate factor
+	   <10..49> [default: 32]
+
+       qp (qp)
+	   Set constant quantization rate control method parameter.
+	   Quantization parameter qp <0..51> [default: 32]
+
+       threads (threads)
+	   Force to use a specific number of threads
+
+   libxvid
+       Xvid MPEG-4 Part 2 encoder wrapper.
+
+       This encoder requires the presence of the libxvidcore headers and
+       library during configuration. You need to explicitly configure the
+       build with "--enable-libxvid --enable-gpl".
+
+       The native "mpeg4" encoder supports the MPEG-4 Part 2 format, so users
+       can encode to this format without this library.
+
+       Options
+
+       The following options are supported by the libxvid wrapper. Some of the
+       following options are listed but are not documented, and correspond to
+       shared codec options. See the Codec Options chapter for their
+       documentation. The other shared options which are not listed have no
+       effect for the libxvid encoder.
+
+       b
+       g
+       qmin
+       qmax
+       mpeg_quant
+       threads
+       bf
+       b_qfactor
+       b_qoffset
+       flags
+	   Set specific encoding flags. Possible values:
+
+	   mv4 Use four motion vector by macroblock.
+
+	   aic Enable high quality AC prediction.
+
+	   gray
+	       Only encode grayscale.
+
+	   qpel
+	       Enable quarter-pixel motion compensation.
+
+	   cgop
+	       Enable closed GOP.
+
+	   global_header
+	       Place global headers in extradata instead of every keyframe.
+
+       gmc Enable the use of global motion compensation (GMC).	Default is 0
+	   (disabled).
+
+       me_quality
+	   Set motion estimation quality level. Possible values in decreasing
+	   order of speed and increasing order of quality:
+
+	   0   Use no motion estimation (default).
+
+	   1, 2
+	       Enable advanced diamond zonal search for 16x16 blocks and half-
+	       pixel refinement for 16x16 blocks.
+
+	   3, 4
+	       Enable all of the things described above, plus advanced diamond
+	       zonal search for 8x8 blocks and half-pixel refinement for 8x8
+	       blocks, also enable motion estimation on chroma planes for P
+	       and B-frames.
+
+	   5, 6
+	       Enable all of the things described above, plus extended 16x16
+	       and 8x8 blocks search.
+
+       mbd Set macroblock decision algorithm. Possible values in the
+	   increasing order of quality:
+
+	   simple
+	       Use macroblock comparing function algorithm (default).
+
+	   bits
+	       Enable rate distortion-based half pixel and quarter pixel
+	       refinement for 16x16 blocks.
+
+	   rd  Enable all of the things described above, plus rate distortion-
+	       based half pixel and quarter pixel refinement for 8x8 blocks,
+	       and rate distortion-based search using square pattern.
+
+       lumi_aq
+	   Enable lumi masking adaptive quantization when set to 1. Default is
+	   0 (disabled).
+
+       variance_aq
+	   Enable variance adaptive quantization when set to 1. Default is 0
+	   (disabled).
+
+	   When combined with lumi_aq, the resulting quality will not be
+	   better than any of the two specified individually. In other words,
+	   the resulting quality will be the worse one of the two effects.
+
+       trellis
+	   Set rate-distortion optimal quantization.
+
+       ssim
+	   Set structural similarity (SSIM) displaying method. Possible
+	   values:
+
+	   off Disable displaying of SSIM information.
+
+	   avg Output average SSIM at the end of encoding to stdout. The
+	       format of showing the average SSIM is:
+
+		       Average SSIM: %f
+
+	       For users who are not familiar with C, %f means a float number,
+	       or a decimal (e.g. 0.939232).
+
+	   frame
+	       Output both per-frame SSIM data during encoding and average
+	       SSIM at the end of encoding to stdout. The format of per-frame
+	       information is:
+
+			      SSIM: avg: %1.3f min: %1.3f max: %1.3f
+
+	       For users who are not familiar with C, %1.3f means a float
+	       number rounded to 3 digits after the dot (e.g. 0.932).
+
+       ssim_acc
+	   Set SSIM accuracy. Valid options are integers within the range of
+	   0-4, while 0 gives the most accurate result and 4 computes the
+	   fastest.
+
+   MediaFoundation
+       This provides wrappers to encoders (both audio and video) in the
+       MediaFoundation framework. It can access both SW and HW encoders.
+       Video encoders can take input in either of nv12 or yuv420p form (some
+       encoders support both, some support only either - in practice, nv12 is
+       the safer choice, especially among HW encoders).
+
+   Microsoft RLE
+       Microsoft RLE aka MSRLE encoder.  Only 8-bit palette mode supported.
+       Compatible with Windows 3.1 and Windows 95.
+
+       Options
+
+       g integer
+	   Keyframe interval.  A keyframe is inserted at least every "-g"
+	   frames, sometimes sooner.
+
+   mpeg2
+       MPEG-2 video encoder.
+
+       Options
+
+       profile
+	   Select the mpeg2 profile to encode:
+
+	   422
+	   high
+	   ss  Spatially Scalable
+
+	   snr SNR Scalable
+
+	   main
+	   simple
+       level
+	   Select the mpeg2 level to encode:
+
+	   high
+	   high1440
+	   main
+	   low
+       seq_disp_ext integer
+	   Specifies if the encoder should write a sequence_display_extension
+	   to the output.
+
+	   -1
+	   auto
+	       Decide automatically to write it or not (this is the default)
+	       by checking if the data to be written is different from the
+	       default or unspecified values.
+
+	   0
+	   never
+	       Never write it.
+
+	   1
+	   always
+	       Always write it.
+
+       video_format integer
+	   Specifies the video_format written into the sequence display
+	   extension indicating the source of the video pictures. The default
+	   is unspecified, can be component, pal, ntsc, secam or mac.  For
+	   maximum compatibility, use component.
+
+       a53cc boolean
+	   Import closed captions (which must be ATSC compatible format) into
+	   output.  Default is 1 (on).
+
+   png
+       PNG image encoder.
+
+       Private options
+
+       dpi integer
+	   Set physical density of pixels, in dots per inch, unset by default
+
+       dpm integer
+	   Set physical density of pixels, in dots per meter, unset by default
+
+   ProRes
+       Apple ProRes encoder.
+
+       FFmpeg contains 2 ProRes encoders, the prores-aw and prores-ks encoder.
+       The used encoder can be chosen with the "-vcodec" option.
+
+       Private Options for prores-ks
+
+       profile integer
+	   Select the ProRes profile to encode
+
+	   proxy
+	   lt
+	   standard
+	   hq
+	   4444
+	   4444xq
+       quant_mat integer
+	   Select quantization matrix.
+
+	   auto
+	   default
+	   proxy
+	   lt
+	   standard
+	   hq
+
+	   If set to auto, the matrix matching the profile will be picked.  If
+	   not set, the matrix providing the highest quality, default, will be
+	   picked.
+
+       bits_per_mb integer
+	   How many bits to allot for coding one macroblock. Different
+	   profiles use between 200 and 2400 bits per macroblock, the maximum
+	   is 8000.
+
+       mbs_per_slice integer
+	   Number of macroblocks in each slice (1-8); the default value (8)
+	   should be good in almost all situations.
+
+       vendor string
+	   Override the 4-byte vendor ID.  A custom vendor ID like apl0 would
+	   claim the stream was produced by the Apple encoder.
+
+       alpha_bits integer
+	   Specify number of bits for alpha component.	Possible values are 0,
+	   8 and 16.  Use 0 to disable alpha plane coding.
+
+       Speed considerations
+
+       In the default mode of operation the encoder has to honor frame
+       constraints (i.e. not produce frames with size bigger than requested)
+       while still making output picture as good as possible.  A frame
+       containing a lot of small details is harder to compress and the encoder
+       would spend more time searching for appropriate quantizers for each
+       slice.
+
+       Setting a higher bits_per_mb limit will improve the speed.
+
+       For the fastest encoding speed set the qscale parameter (4 is the
+       recommended value) and do not set a size constraint.
+
+   QSV Encoders
+       The family of Intel QuickSync Video encoders (MPEG-2, H.264, HEVC,
+       JPEG/MJPEG, VP9, AV1)
+
+       Ratecontrol Method
+
+       The ratecontrol method is selected as follows:
+
+       o   When global_quality is specified, a quality-based mode is used.
+	   Specifically this means either
+
+	   -   CQP - constant quantizer scale, when the qscale codec flag is
+	       also set (the -qscale ffmpeg option).
+
+	   -   LA_ICQ - intelligent constant quality with lookahead, when the
+	       look_ahead option is also set.
+
+	   -   ICQ -- intelligent constant quality otherwise. For the ICQ
+	       modes, global quality range is 1 to 51, with 1 being the best
+	       quality.
+
+       o   Otherwise when the desired average bitrate is specified with the b
+	   option, a bitrate-based mode is used.
+
+	   -   LA - VBR with lookahead, when the look_ahead option is
+	       specified.
+
+	   -   VCM - video conferencing mode, when the vcm option is set.
+
+	   -   CBR - constant bitrate, when maxrate is specified and equal to
+	       the average bitrate.
+
+	   -   VBR - variable bitrate, when maxrate is specified, but is
+	       higher than the average bitrate.
+
+	   -   AVBR - average VBR mode, when maxrate is not specified, both
+	       avbr_accuracy and avbr_convergence are set to non-zero. This
+	       mode is available for H264 and HEVC on Windows.
+
+       o   Otherwise the default ratecontrol method CQP is used.
+
+       Note that depending on your system, a different mode than the one you
+       specified may be selected by the encoder. Set the verbosity level to
+       verbose or higher to see the actual settings used by the QSV runtime.
+
+       Global Options -> MSDK Options
+
+       Additional libavcodec global options are mapped to MSDK options as
+       follows:
+
+       o   g/gop_size -> GopPicSize
+
+       o   bf/max_b_frames+1 -> GopRefDist
+
+       o   rc_init_occupancy/rc_initial_buffer_occupancy -> InitialDelayInKB
+
+       o   slices -> NumSlice
+
+       o   refs -> NumRefFrame
+
+       o   b_strategy/b_frame_strategy -> BRefType
+
+       o   cgop/CLOSED_GOP codec flag -> GopOptFlag
+
+       o   For the CQP mode, the i_qfactor/i_qoffset and b_qfactor/b_qoffset
+	   set the difference between QPP and QPI, and QPP and QPB
+	   respectively.
+
+       o   Setting the coder option to the value vlc will make the H.264
+	   encoder use CAVLC instead of CABAC.
+
+       Common Options
+
+       Following options are used by all qsv encoders.
+
+       async_depth
+	   Specifies how many asynchronous operations an application performs
+	   before the application explicitly synchronizes the result. If zero,
+	   the value is not specified.
+
+       preset
+	   This option itemizes a range of choices from veryfast (best speed)
+	   to veryslow (best quality).
+
+	   veryfast
+	   faster
+	   fast
+	   medium
+	   slow
+	   slower
+	   veryslow
+       forced_idr
+	   Forcing I frames as IDR frames.
+
+       low_power
+	   For encoders set this flag to ON to reduce power consumption and
+	   GPU usage.
+
+       Runtime Options
+
+       Following options can be used durning qsv encoding.
+
+       global_quality
+       i_quant_factor
+       i_quant_offset
+       b_quant_factor
+       b_quant_offset
+	   Supported in h264_qsv and hevc_qsv.	Change these value to reset
+	   qsv codec's qp configuration.
+
+       max_frame_size
+	   Supported in h264_qsv and hevc_qsv.	Change this value to reset qsv
+	   codec's MaxFrameSize configuration.
+
+       gop_size
+	   Change this value to reset qsv codec's gop configuration.
+
+       int_ref_type
+       int_ref_cycle_size
+       int_ref_qp_delta
+       int_ref_cycle_dist
+	   Supported in h264_qsv and hevc_qsv.	Change these value to reset
+	   qsv codec's Intra Refresh configuration.
+
+       qmax
+       qmin
+       max_qp_i
+       min_qp_i
+       max_qp_p
+       min_qp_p
+       max_qp_b
+       min_qp_b
+	   Supported in h264_qsv.  Change these value to reset qsv codec's
+	   max/min qp configuration.
+
+       low_delay_brc
+	   Supported in h264_qsv, hevc_qsv and av1_qsv.  Change this value to
+	   reset qsv codec's low_delay_brc configuration.
+
+       framerate
+	   Change this value to reset qsv codec's framerate configuration.
+
+       bit_rate
+       rc_buffer_size
+       rc_initial_buffer_occupancy
+       rc_max_rate
+	   Change these value to reset qsv codec's bitrate control
+	   configuration.
+
+       pic_timing_sei
+	   Supported in h264_qsv and hevc_qsv.	Change this value to reset qsv
+	   codec's pic_timing_sei configuration.
+
+       H264 options
+
+       These options are used by h264_qsv
+
+       extbrc
+	   Extended bitrate control.
+
+       recovery_point_sei
+	   Set this flag to insert the recovery point SEI message at the
+	   beginning of every intra refresh cycle.
+
+       rdo Enable rate distortion optimization.
+
+       max_frame_size
+	   Maximum encoded frame size in bytes.
+
+       max_frame_size_i
+	   Maximum encoded frame size for I frames in bytes. If this value is
+	   set as larger than zero, then for I frames the value set by
+	   max_frame_size is ignored.
+
+       max_frame_size_p
+	   Maximum encoded frame size for P frames in bytes. If this value is
+	   set as larger than zero, then for P frames the value set by
+	   max_frame_size is ignored.
+
+       max_slice_size
+	   Maximum encoded slice size in bytes.
+
+       bitrate_limit
+	   Toggle bitrate limitations.	Modifies bitrate to be in the range
+	   imposed by the QSV encoder. Setting this flag off may lead to
+	   violation of HRD conformance. Mind that specifying bitrate below
+	   the QSV encoder range might significantly affect quality. If on
+	   this option takes effect in non CQP modes: if bitrate is not in the
+	   range imposed by the QSV encoder, it will be changed to be in the
+	   range.
+
+       mbbrc
+	   Setting this flag enables macroblock level bitrate control that
+	   generally improves subjective visual quality. Enabling this flag
+	   may have negative impact on performance and objective visual
+	   quality metric.
+
+       low_delay_brc
+	   Setting this flag turns on or off LowDelayBRC feautre in qsv
+	   plugin, which provides more accurate bitrate control to minimize
+	   the variance of bitstream size frame by frame. Value: -1-default
+	   0-off 1-on
+
+       adaptive_i
+	   This flag controls insertion of I frames by the QSV encoder. Turn
+	   ON this flag to allow changing of frame type from P and B to I.
+
+       adaptive_b
+	   This flag controls changing of frame type from B to P.
+
+       p_strategy
+	   Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to
+	   0).
+
+       b_strategy
+	   This option controls usage of B frames as reference.
+
+       dblk_idc
+	   This option disable deblocking. It has value in range 0~2.
+
+       cavlc
+	   If set, CAVLC is used; if unset, CABAC is used for encoding.
+
+       vcm Video conferencing mode, please see ratecontrol method.
+
+       idr_interval
+	   Distance (in I-frames) between IDR frames.
+
+       pic_timing_sei
+	   Insert picture timing SEI with pic_struct_syntax element.
+
+       single_sei_nal_unit
+	   Put all the SEI messages into one NALU.
+
+       max_dec_frame_buffering
+	   Maximum number of frames buffered in the DPB.
+
+       look_ahead
+	   Use VBR algorithm with look ahead.
+
+       look_ahead_depth
+	   Depth of look ahead in number frames.
+
+       look_ahead_downsampling
+	   Downscaling factor for the frames saved for the lookahead analysis.
+
+	   unknown
+	   auto
+	   off
+	   2x
+	   4x
+       int_ref_type
+	   Specifies intra refresh type. The major goal of intra refresh is
+	   improvement of error resilience without significant impact on
+	   encoded bitstream size caused by I frames. The SDK encoder achieves
+	   this by encoding part of each frame in refresh cycle using intra
+	   MBs. none means no refresh. vertical means vertical refresh, by
+	   column of MBs. horizontal means horizontal refresh, by rows of MBs.
+	   slice means horizontal refresh by slices without overlapping. In
+	   case of slice, in_ref_cycle_size is ignored. To enable intra
+	   refresh, B frame should be set to 0.
+
+       int_ref_cycle_size
+	   Specifies number of pictures within refresh cycle starting from 2.
+	   0 and 1 are invalid values.
+
+       int_ref_qp_delta
+	   Specifies QP difference for inserted intra MBs. This is signed
+	   value in [-51, 51] range if target encoding bit-depth for luma
+	   samples is 8 and this range is [-63, 63] for 10 bit-depth or [-75,
+	   75] for 12 bit-depth respectively.
+
+       int_ref_cycle_dist
+	   Distance between the beginnings of the intra-refresh cycles in
+	   frames.
+
+       profile
+	   unknown
+	   baseline
+	   main
+	   high
+       a53cc
+	   Use A53 Closed Captions (if available).
+
+       aud Insert the Access Unit Delimiter NAL.
+
+       mfmode
+	   Multi-Frame Mode.
+
+	   off
+	   auto
+       repeat_pps
+	   Repeat pps for every frame.
+
+       max_qp_i
+	   Maximum video quantizer scale for I frame.
+
+       min_qp_i
+	   Minimum video quantizer scale for I frame.
+
+       max_qp_p
+	   Maximum video quantizer scale for P frame.
+
+       min_qp_p
+	   Minimum video quantizer scale for P frame.
+
+       max_qp_b
+	   Maximum video quantizer scale for B frame.
+
+       min_qp_b
+	   Minimum video quantizer scale for B frame.
+
+       scenario
+	   Provides a hint to encoder about the scenario for the encoding
+	   session.
+
+	   unknown
+	   displayremoting
+	   videoconference
+	   archive
+	   livestreaming
+	   cameracapture
+	   videosurveillance
+	   gamestreaming
+	   remotegaming
+       avbr_accuracy
+	   Accuracy of the AVBR ratecontrol (unit of tenth of percent).
+
+       avbr_convergence
+	   Convergence of the AVBR ratecontrol (unit of 100 frames)
+
+	   The parameters avbr_accuracy and avbr_convergence are for the
+	   average variable bitrate control (AVBR) algorithm.  The algorithm
+	   focuses on overall encoding quality while meeting the specified
+	   bitrate, target_bitrate, within the accuracy range avbr_accuracy,
+	   after a avbr_Convergence period. This method does not follow HRD
+	   and the instant bitrate is not capped or padded.
+
+       skip_frame
+	   Use per-frame metadata "qsv_skip_frame" to skip frame when
+	   encoding. This option defines the usage of this metadata.
+
+	   no_skip
+	       Frame skipping is disabled.
+
+	   insert_dummy
+	       Encoder inserts into bitstream frame where all macroblocks are
+	       encoded as skipped.
+
+	   insert_nothing
+	       Similar to insert_dummy, but encoder inserts nothing into
+	       bitstream. The skipped frames are still used in brc. For
+	       example, gop still include skipped frames, and the frames after
+	       skipped frames will be larger in size.
+
+	   brc_only
+	       skip_frame metadata indicates the number of missed frames
+	       before the current frame.
+
+       HEVC Options
+
+       These options are used by hevc_qsv
+
+       extbrc
+	   Extended bitrate control.
+
+       recovery_point_sei
+	   Set this flag to insert the recovery point SEI message at the
+	   beginning of every intra refresh cycle.
+
+       rdo Enable rate distortion optimization.
+
+       max_frame_size
+	   Maximum encoded frame size in bytes.
+
+       max_frame_size_i
+	   Maximum encoded frame size for I frames in bytes. If this value is
+	   set as larger than zero, then for I frames the value set by
+	   max_frame_size is ignored.
+
+       max_frame_size_p
+	   Maximum encoded frame size for P frames in bytes. If this value is
+	   set as larger than zero, then for P frames the value set by
+	   max_frame_size is ignored.
+
+       max_slice_size
+	   Maximum encoded slice size in bytes.
+
+       mbbrc
+	   Setting this flag enables macroblock level bitrate control that
+	   generally improves subjective visual quality. Enabling this flag
+	   may have negative impact on performance and objective visual
+	   quality metric.
+
+       low_delay_brc
+	   Setting this flag turns on or off LowDelayBRC feautre in qsv
+	   plugin, which provides more accurate bitrate control to minimize
+	   the variance of bitstream size frame by frame. Value: -1-default
+	   0-off 1-on
+
+       adaptive_i
+	   This flag controls insertion of I frames by the QSV encoder. Turn
+	   ON this flag to allow changing of frame type from P and B to I.
+
+       adaptive_b
+	   This flag controls changing of frame type from B to P.
+
+       p_strategy
+	   Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to
+	   0).
+
+       b_strategy
+	   This option controls usage of B frames as reference.
+
+       dblk_idc
+	   This option disable deblocking. It has value in range 0~2.
+
+       idr_interval
+	   Distance (in I-frames) between IDR frames.
+
+	   begin_only
+	       Output an IDR-frame only at the beginning of the stream.
+
+       load_plugin
+	   A user plugin to load in an internal session.
+
+	   none
+	   hevc_sw
+	   hevc_hw
+       load_plugins
+	   A :-separate list of hexadecimal plugin UIDs to load in an internal
+	   session.
+
+       look_ahead_depth
+	   Depth of look ahead in number frames, available when extbrc option
+	   is enabled.
+
+       profile
+	   Set the encoding profile (scc requires libmfx >= 1.32).
+
+	   unknown
+	   main
+	   main10
+	   mainsp
+	   rext
+	   scc
+       tier
+	   Set the encoding tier (only level >= 4 can support high tier).
+	   This option only takes effect when the level option is specified.
+
+	   main
+	   high
+       gpb 1: GPB (generalized P/B frame)
+
+	   0: regular P frame.
+
+       tile_cols
+	   Number of columns for tiled encoding.
+
+       tile_rows
+	   Number of rows for tiled encoding.
+
+       aud Insert the Access Unit Delimiter NAL.
+
+       pic_timing_sei
+	   Insert picture timing SEI with pic_struct_syntax element.
+
+       transform_skip
+	   Turn this option ON to enable transformskip. It is supported on
+	   platform equal or newer than ICL.
+
+       int_ref_type
+	   Specifies intra refresh type. The major goal of intra refresh is
+	   improvement of error resilience without significant impact on
+	   encoded bitstream size caused by I frames. The SDK encoder achieves
+	   this by encoding part of each frame in refresh cycle using intra
+	   MBs. none means no refresh. vertical means vertical refresh, by
+	   column of MBs. horizontal means horizontal refresh, by rows of MBs.
+	   slice means horizontal refresh by slices without overlapping. In
+	   case of slice, in_ref_cycle_size is ignored. To enable intra
+	   refresh, B frame should be set to 0.
+
+       int_ref_cycle_size
+	   Specifies number of pictures within refresh cycle starting from 2.
+	   0 and 1 are invalid values.
+
+       int_ref_qp_delta
+	   Specifies QP difference for inserted intra MBs. This is signed
+	   value in [-51, 51] range if target encoding bit-depth for luma
+	   samples is 8 and this range is [-63, 63] for 10 bit-depth or [-75,
+	   75] for 12 bit-depth respectively.
+
+       int_ref_cycle_dist
+	   Distance between the beginnings of the intra-refresh cycles in
+	   frames.
+
+       max_qp_i
+	   Maximum video quantizer scale for I frame.
+
+       min_qp_i
+	   Minimum video quantizer scale for I frame.
+
+       max_qp_p
+	   Maximum video quantizer scale for P frame.
+
+       min_qp_p
+	   Minimum video quantizer scale for P frame.
+
+       max_qp_b
+	   Maximum video quantizer scale for B frame.
+
+       min_qp_b
+	   Minimum video quantizer scale for B frame.
+
+       scenario
+	   Provides a hint to encoder about the scenario for the encoding
+	   session.
+
+	   unknown
+	   displayremoting
+	   videoconference
+	   archive
+	   livestreaming
+	   cameracapture
+	   videosurveillance
+	   gamestreaming
+	   remotegaming
+       avbr_accuracy
+	   Accuracy of the AVBR ratecontrol (unit of tenth of percent).
+
+       avbr_convergence
+	   Convergence of the AVBR ratecontrol (unit of 100 frames)
+
+	   The parameters avbr_accuracy and avbr_convergence are for the
+	   average variable bitrate control (AVBR) algorithm.  The algorithm
+	   focuses on overall encoding quality while meeting the specified
+	   bitrate, target_bitrate, within the accuracy range avbr_accuracy,
+	   after a avbr_Convergence period. This method does not follow HRD
+	   and the instant bitrate is not capped or padded.
+
+       skip_frame
+	   Use per-frame metadata "qsv_skip_frame" to skip frame when
+	   encoding. This option defines the usage of this metadata.
+
+	   no_skip
+	       Frame skipping is disabled.
+
+	   insert_dummy
+	       Encoder inserts into bitstream frame where all macroblocks are
+	       encoded as skipped.
+
+	   insert_nothing
+	       Similar to insert_dummy, but encoder inserts nothing into
+	       bitstream. The skipped frames are still used in brc. For
+	       example, gop still include skipped frames, and the frames after
+	       skipped frames will be larger in size.
+
+	   brc_only
+	       skip_frame metadata indicates the number of missed frames
+	       before the current frame.
+
+       MPEG2 Options
+
+       These options are used by mpeg2_qsv
+
+       profile
+	   unknown
+	   simple
+	   main
+	   high
+
+       VP9 Options
+
+       These options are used by vp9_qsv
+
+       profile
+	   unknown
+	   profile0
+	   profile1
+	   profile2
+	   profile3
+       tile_cols
+	   Number of columns for tiled encoding (requires libmfx >= 1.29).
+
+       tile_rows
+	   Number of rows for tiled encoding (requires libmfx  >= 1.29).
+
+       AV1 Options
+
+       These options are used by av1_qsv (requires libvpl).
+
+       profile
+	   unknown
+	   main
+       tile_cols
+	   Number of columns for tiled encoding.
+
+       tile_rows
+	   Number of rows for tiled encoding.
+
+       adaptive_i
+	   This flag controls insertion of I frames by the QSV encoder. Turn
+	   ON this flag to allow changing of frame type from P and B to I.
+
+       adaptive_b
+	   This flag controls changing of frame type from B to P.
+
+       b_strategy
+	   This option controls usage of B frames as reference.
+
+       extbrc
+	   Extended bitrate control.
+
+       look_ahead_depth
+	   Depth of look ahead in number frames, available when extbrc option
+	   is enabled.
+
+       low_delay_brc
+	   Setting this flag turns on or off LowDelayBRC feautre in qsv
+	   plugin, which provides more accurate bitrate control to minimize
+	   the variance of bitstream size frame by frame. Value: -1-default
+	   0-off 1-on
+
+       max_frame_size
+	   Set the allowed max size in bytes for each frame. If the frame size
+	   exceeds the limitation, encoder will adjust the QP value to control
+	   the frame size.  Invalid in CQP rate control mode.
+
+   snow
+       Options
+
+       iterative_dia_size
+	   dia size for the iterative motion estimation
+
+   VAAPI encoders
+       Wrappers for hardware encoders accessible via VAAPI.
+
+       These encoders only accept input in VAAPI hardware surfaces.  If you
+       have input in software frames, use the hwupload filter to upload them
+       to the GPU.
+
+       The following standard libavcodec options are used:
+
+       o   g / gop_size
+
+       o   bf / max_b_frames
+
+       o   profile
+
+	   If not set, this will be determined automatically from the format
+	   of the input frames and the profiles supported by the driver.
+
+       o   level
+
+       o   b / bit_rate
+
+       o   maxrate / rc_max_rate
+
+       o   bufsize / rc_buffer_size
+
+       o   rc_init_occupancy / rc_initial_buffer_occupancy
+
+       o   compression_level
+
+	   Speed / quality tradeoff: higher values are faster / worse quality.
+
+       o   q / global_quality
+
+	   Size / quality tradeoff: higher values are smaller / worse quality.
+
+       o   qmin
+
+       o   qmax
+
+       o   i_qfactor / i_quant_factor
+
+       o   i_qoffset / i_quant_offset
+
+       o   b_qfactor / b_quant_factor
+
+       o   b_qoffset / b_quant_offset
+
+       o   slices
+
+       All encoders support the following options:
+
+       low_power
+	   Some drivers/platforms offer a second encoder for some codecs
+	   intended to use less power than the default encoder; setting this
+	   option will attempt to use that encoder.  Note that it may support
+	   a reduced feature set, so some other options may not be available
+	   in this mode.
+
+       idr_interval
+	   Set the number of normal intra frames between full-refresh (IDR)
+	   frames in open-GOP mode.  The intra frames are still IRAPs, but
+	   will not include global headers and may have non-decodable leading
+	   pictures.
+
+       b_depth
+	   Set the B-frame reference depth.  When set to one (the default),
+	   all B-frames will refer only to P- or I-frames.  When set to
+	   greater values multiple layers of B-frames will be present, frames
+	   in each layer only referring to frames in higher layers.
+
+       async_depth
+	   Maximum processing parallelism. Increase this to improve single
+	   channel performance. This option doesn't work if driver doesn't
+	   implement vaSyncBuffer function. Please make sure there are enough
+	   hw_frames allocated if a large number of async_depth is used.
+
+       max_frame_size
+	   Set the allowed max size in bytes for each frame. If the frame size
+	   exceeds the limitation, encoder will adjust the QP value to control
+	   the frame size.  Invalid in CQP rate control mode.
+
+       rc_mode
+	   Set the rate control mode to use.  A given driver may only support
+	   a subset of modes.
+
+	   Possible modes:
+
+	   auto
+	       Choose the mode automatically based on driver support and the
+	       other options.  This is the default.
+
+	   CQP Constant-quality.
+
+	   CBR Constant-bitrate.
+
+	   VBR Variable-bitrate.
+
+	   ICQ Intelligent constant-quality.
+
+	   QVBR
+	       Quality-defined variable-bitrate.
+
+	   AVBR
+	       Average variable bitrate.
+
+       blbrc
+	   Enable block level rate control, which assigns different bitrate
+	   block by block.  Invalid for CQP mode.
+
+       Each encoder also has its own specific options:
+
+       av1_vaapi
+	   profile sets the value of seq_profile.  tier sets the value of
+	   seq_tier.  level sets the value of seq_level_idx.
+
+	   tiles
+	       Set the number of tiles to encode the input video with, as
+	       columns x rows.	(default is auto, which means use minimal tile
+	       column/row number).
+
+	   tile_groups
+	       Set tile groups number. All the tiles will be distributed as
+	       evenly as possible to each tile group. (default is 1).
+
+       h264_vaapi
+	   profile sets the value of profile_idc and the
+	   constraint_set*_flags.  level sets the value of level_idc.
+
+	   coder
+	       Set entropy encoder (default is cabac).	Possible values:
+
+	       ac
+	       cabac
+		   Use CABAC.
+
+	       vlc
+	       cavlc
+		   Use CAVLC.
+
+	   aud Include access unit delimiters in the stream (not included by
+	       default).
+
+	   sei Set SEI message types to include.  Some combination of the
+	       following values:
+
+	       identifier
+		   Include a user_data_unregistered message containing
+		   information about the encoder.
+
+	       timing
+		   Include picture timing parameters (buffering_period and
+		   pic_timing messages).
+
+	       recovery_point
+		   Include recovery points where appropriate (recovery_point
+		   messages).
+
+       hevc_vaapi
+	   profile and level set the values of general_profile_idc and
+	   general_level_idc respectively.
+
+	   aud Include access unit delimiters in the stream (not included by
+	       default).
+
+	   tier
+	       Set general_tier_flag.  This may affect the level chosen for
+	       the stream if it is not explicitly specified.
+
+	   sei Set SEI message types to include.  Some combination of the
+	       following values:
+
+	       hdr Include HDR metadata if the input frames have it
+		   (mastering_display_colour_volume and content_light_level
+		   messages).
+
+	   tiles
+	       Set the number of tiles to encode the input video with, as
+	       columns x rows.	Larger numbers allow greater parallelism in
+	       both encoding and decoding, but may decrease coding efficiency.
+
+       mjpeg_vaapi
+	   Only baseline DCT encoding is supported.  The encoder always uses
+	   the standard quantisation and huffman tables - global_quality
+	   scales the standard quantisation table (range 1-100).
+
+	   For YUV, 4:2:0, 4:2:2 and 4:4:4 subsampling modes are supported.
+	   RGB is also supported, and will create an RGB JPEG.
+
+	   jfif
+	       Include JFIF header in each frame (not included by default).
+
+	   huffman
+	       Include standard huffman tables (on by default).  Turning this
+	       off will save a few hundred bytes in each output frame, but may
+	       lose compatibility with some JPEG decoders which don't fully
+	       handle MJPEG.
+
+       mpeg2_vaapi
+	   profile and level set the value of profile_and_level_indication.
+
+       vp8_vaapi
+	   B-frames are not supported.
+
+	   global_quality sets the q_idx used for non-key frames (range
+	   0-127).
+
+	   loop_filter_level
+	   loop_filter_sharpness
+	       Manually set the loop filter parameters.
+
+       vp9_vaapi
+	   global_quality sets the q_idx used for P-frames (range 0-255).
+
+	   loop_filter_level
+	   loop_filter_sharpness
+	       Manually set the loop filter parameters.
+
+	   B-frames are supported, but the output stream is always in encode
+	   order rather than display order.  If B-frames are enabled, it may
+	   be necessary to use the vp9_raw_reorder bitstream filter to modify
+	   the output stream to display frames in the correct order.
+
+	   Only normal frames are produced - the vp9_superframe bitstream
+	   filter may be required to produce a stream usable with all
+	   decoders.
+
+   vbn
+       Vizrt Binary Image encoder.
+
+       This format is used by the broadcast vendor Vizrt for quick texture
+       streaming.  Advanced features of the format such as LZW compression of
+       texture data or generation of mipmaps are not supported.
+
+       Options
+
+       format string
+	   Sets the texture compression used by the VBN file. Can be dxt1,
+	   dxt5 or raw. Default is dxt5.
+
+   vc2
+       SMPTE VC-2 (previously BBC Dirac Pro). This codec was primarily aimed
+       at professional broadcasting but since it supports yuv420, yuv422 and
+       yuv444 at 8 (limited range or full range), 10 or 12 bits, this makes it
+       suitable for other tasks which require low overhead and low compression
+       (like screen recording).
+
+       Options
+
+       b   Sets target video bitrate. Usually that's around 1:6 of the
+	   uncompressed video bitrate (e.g. for 1920x1080 50fps yuv422p10
+	   that's around 400Mbps). Higher values (close to the uncompressed
+	   bitrate) turn on lossless compression mode.
+
+       field_order
+	   Enables field coding when set (e.g. to tt - top field first) for
+	   interlaced inputs. Should increase compression with interlaced
+	   content as it splits the fields and encodes each separately.
+
+       wavelet_depth
+	   Sets the total amount of wavelet transforms to apply, between 1 and
+	   5 (default).  Lower values reduce compression and quality. Less
+	   capable decoders may not be able to handle values of wavelet_depth
+	   over 3.
+
+       wavelet_type
+	   Sets the transform type. Currently only 5_3 (LeGall) and 9_7
+	   (Deslauriers-Dubuc) are implemented, with 9_7 being the one with
+	   better compression and thus is the default.
+
+       slice_width
+       slice_height
+	   Sets the slice size for each slice. Larger values result in better
+	   compression.  For compatibility with other more limited decoders
+	   use slice_width of 32 and slice_height of 8.
+
+       tolerance
+	   Sets the undershoot tolerance of the rate control system in
+	   percent. This is to prevent an expensive search from being run.
+
+       qm  Sets the quantization matrix preset to use by default or when
+	   wavelet_depth is set to 5
+
+	   -   default Uses the default quantization matrix from the
+	       specifications, extended with values for the fifth level. This
+	       provides a good balance between keeping detail and omitting
+	       artifacts.
+
+	   -   flat Use a completely zeroed out quantization matrix. This
+	       increases PSNR but might reduce perception. Use in bogus
+	       benchmarks.
+
+	   -   color Reduces detail but attempts to preserve color at
+	       extremely low bitrates.
+
+SUBTITLES ENCODERS
+   dvdsub
+       This codec encodes the bitmap subtitle format that is used in DVDs.
+       Typically they are stored in VOBSUB file pairs (*.idx + *.sub), and
+       they can also be used in Matroska files.
+
+       Options
+
+       palette
+	   Specify the global palette used by the bitmaps.
+
+	   The format for this option is a string containing 16 24-bits
+	   hexadecimal numbers (without 0x prefix) separated by commas, for
+	   example "0d00ee, ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b,
+	   0d617a, 7b7b7b, d1d1d1, 7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c,
+	   7c127b".
+
+       even_rows_fix
+	   When set to 1, enable a work-around that makes the number of pixel
+	   rows even in all subtitles.	This fixes a problem with some players
+	   that cut off the bottom row if the number is odd.  The work-around
+	   just adds a fully transparent row if needed.  The overhead is low,
+	   typically one byte per subtitle on average.
+
+	   By default, this work-around is disabled.
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libavcodec(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							      FFMPEG-CODECS(1)
diff --git a/ffmpeg/manpages/ffmpeg-devices.txt b/ffmpeg/manpages/ffmpeg-devices.txt
new file mode 100644
index 0000000000000000000000000000000000000000..76379cb93e0284df9a41f3a561e50f2367d080b0
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-devices.txt
@@ -0,0 +1,1915 @@
+FFMPEG-DEVICES(1)					     FFMPEG-DEVICES(1)
+
+NAME
+       ffmpeg-devices - FFmpeg devices
+
+DESCRIPTION
+       This document describes the input and output devices provided by the
+       libavdevice library.
+
+DEVICE OPTIONS
+       The libavdevice library provides the same interface as libavformat.
+       Namely, an input device is considered like a demuxer, and an output
+       device like a muxer, and the interface and generic device options are
+       the same provided by libavformat (see the ffmpeg-formats manual).
+
+       In addition each input or output device may support so-called private
+       options, which are specific for that component.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the device "AVFormatContext" options
+       or using the libavutil/opt.h API for programmatic use.
+
+INPUT DEVICES
+       Input devices are configured elements in FFmpeg which enable accessing
+       the data coming from a multimedia device attached to your system.
+
+       When you configure your FFmpeg build, all the supported input devices
+       are enabled by default. You can list all available ones using the
+       configure option "--list-indevs".
+
+       You can disable all the input devices using the configure option
+       "--disable-indevs", and selectively enable an input device using the
+       option "--enable-indev=INDEV", or you can disable a particular input
+       device using the option "--disable-indev=INDEV".
+
+       The option "-devices" of the ff* tools will display the list of
+       supported input devices.
+
+       A description of the currently available input devices follows.
+
+   alsa
+       ALSA (Advanced Linux Sound Architecture) input device.
+
+       To enable this input device during configuration you need libasound
+       installed on your system.
+
+       This device allows capturing from an ALSA device. The name of the
+       device to capture has to be an ALSA card identifier.
+
+       An ALSA identifier has the syntax:
+
+	       hw:<CARD>[,<DEV>[,<SUBDEV>]]
+
+       where the DEV and SUBDEV components are optional.
+
+       The three arguments (in order: CARD,DEV,SUBDEV) specify card number or
+       identifier, device number and subdevice number (-1 means any).
+
+       To see the list of cards currently recognized by your system check the
+       files /proc/asound/cards and /proc/asound/devices.
+
+       For example to capture with ffmpeg from an ALSA device with card id 0,
+       you may run the command:
+
+	       ffmpeg -f alsa -i hw:0 alsaout.wav
+
+       For more information see:
+       <http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html>
+
+       Options
+
+       sample_rate
+	   Set the sample rate in Hz. Default is 48000.
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   android_camera
+       Android camera input device.
+
+       This input devices uses the Android Camera2 NDK API which is available
+       on devices with API level 24+. The availability of android_camera is
+       autodetected during configuration.
+
+       This device allows capturing from all cameras on an Android device,
+       which are integrated into the Camera2 NDK API.
+
+       The available cameras are enumerated internally and can be selected
+       with the camera_index parameter. The input file string is discarded.
+
+       Generally the back facing camera has index 0 while the front facing
+       camera has index 1.
+
+       Options
+
+       video_size
+	   Set the video size given as a string such as 640x480 or hd720.
+	   Falls back to the first available configuration reported by Android
+	   if requested video size is not available or by default.
+
+       framerate
+	   Set the video framerate.  Falls back to the first available
+	   configuration reported by Android if requested framerate is not
+	   available or by default (-1).
+
+       camera_index
+	   Set the index of the camera to use. Default is 0.
+
+       input_queue_size
+	   Set the maximum number of frames to buffer. Default is 5.
+
+   avfoundation
+       AVFoundation input device.
+
+       AVFoundation is the currently recommended framework by Apple for
+       streamgrabbing on OSX >= 10.7 as well as on iOS.
+
+       The input filename has to be given in the following syntax:
+
+	       -i "[[VIDEO]:[AUDIO]]"
+
+       The first entry selects the video input while the latter selects the
+       audio input.  The stream has to be specified by the device name or the
+       device index as shown by the device list.  Alternatively, the video
+       and/or audio input device can be chosen by index using the
+
+	   B<-video_device_index E<lt>INDEXE<gt>>
+
+       and/or
+
+	   B<-audio_device_index E<lt>INDEXE<gt>>
+
+       , overriding any device name or index given in the input filename.
+
+       All available devices can be enumerated by using -list_devices true,
+       listing all device names and corresponding indices.
+
+       There are two device name aliases:
+
+       "default"
+	   Select the AVFoundation default device of the corresponding type.
+
+       "none"
+	   Do not record the corresponding media type.	This is equivalent to
+	   specifying an empty device name or index.
+
+       Options
+
+       AVFoundation supports the following options:
+
+       -list_devices <TRUE|FALSE>
+	   If set to true, a list of all available input devices is given
+	   showing all device names and indices.
+
+       -video_device_index <INDEX>
+	   Specify the video device by its index. Overrides anything given in
+	   the input filename.
+
+       -audio_device_index <INDEX>
+	   Specify the audio device by its index. Overrides anything given in
+	   the input filename.
+
+       -pixel_format <FORMAT>
+	   Request the video device to use a specific pixel format.  If the
+	   specified format is not supported, a list of available formats is
+	   given and the first one in this list is used instead. Available
+	   pixel formats are: "monob, rgb555be, rgb555le, rgb565be, rgb565le,
+	   rgb24, bgr24, 0rgb, bgr0, 0bgr, rgb0,
+	    bgr48be, uyvy422, yuva444p, yuva444p16le, yuv444p, yuv422p16,
+	   yuv422p10, yuv444p10,
+	    yuv420p, nv12, yuyv422, gray"
+
+       -framerate
+	   Set the grabbing frame rate. Default is "ntsc", corresponding to a
+	   frame rate of "30000/1001".
+
+       -video_size
+	   Set the video frame size.
+
+       -capture_cursor
+	   Capture the mouse pointer. Default is 0.
+
+       -capture_mouse_clicks
+	   Capture the screen mouse clicks. Default is 0.
+
+       -capture_raw_data
+	   Capture the raw device data. Default is 0.  Using this option may
+	   result in receiving the underlying data delivered to the
+	   AVFoundation framework. E.g. for muxed devices that sends raw DV
+	   data to the framework (like tape-based camcorders), setting this
+	   option to false results in extracted video frames captured in the
+	   designated pixel format only. Setting this option to true results
+	   in receiving the raw DV stream untouched.
+
+       Examples
+
+       o   Print the list of AVFoundation supported devices and exit:
+
+		   $ ffmpeg -f avfoundation -list_devices true -i ""
+
+       o   Record video from video device 0 and audio from audio device 0 into
+	   out.avi:
+
+		   $ ffmpeg -f avfoundation -i "0:0" out.avi
+
+       o   Record video from video device 2 and audio from audio device 1 into
+	   out.avi:
+
+		   $ ffmpeg -f avfoundation -video_device_index 2 -i ":1" out.avi
+
+       o   Record video from the system default video device using the pixel
+	   format bgr0 and do not record any audio into out.avi:
+
+		   $ ffmpeg -f avfoundation -pixel_format bgr0 -i "default:none" out.avi
+
+       o   Record raw DV data from a suitable input device and write the
+	   output into out.dv:
+
+		   $ ffmpeg -f avfoundation -capture_raw_data true -i "zr100:none" out.dv
+
+   bktr
+       BSD video input device. Deprecated and will be removed - please contact
+       the developers if you are interested in maintaining it.
+
+       Options
+
+       framerate
+	   Set the frame rate.
+
+       video_size
+	   Set the video frame size. Default is "vga".
+
+       standard
+	   Available values are:
+
+	   pal
+	   ntsc
+	   secam
+	   paln
+	   palm
+	   ntscj
+
+   decklink
+       The decklink input device provides capture capabilities for Blackmagic
+       DeckLink devices.
+
+       To enable this input device, you need the Blackmagic DeckLink SDK and
+       you need to configure with the appropriate "--extra-cflags" and
+       "--extra-ldflags".  On Windows, you need to run the IDL files through
+       widl.
+
+       DeckLink is very picky about the formats it supports. Pixel format of
+       the input can be set with raw_format.  Framerate and video size must be
+       determined for your device with -list_formats 1. Audio sample rate is
+       always 48 kHz and the number of channels can be 2, 8 or 16. Note that
+       all audio channels are bundled in one single audio track.
+
+       Options
+
+       list_devices
+	   If set to true, print a list of devices and exit.  Defaults to
+	   false. This option is deprecated, please use the "-sources" option
+	   of ffmpeg to list the available input devices.
+
+       list_formats
+	   If set to true, print a list of supported formats and exit.
+	   Defaults to false.
+
+       format_code <FourCC>
+	   This sets the input video format to the format given by the FourCC.
+	   To see the supported values of your device(s) use list_formats.
+	   Note that there is a FourCC 'pal ' that can also be used as pal (3
+	   letters).  Default behavior is autodetection of the input video
+	   format, if the hardware supports it.
+
+       raw_format
+	   Set the pixel format of the captured video.	Available values are:
+
+	   auto
+	       This is the default which means 8-bit YUV 422 or 8-bit ARGB if
+	       format autodetection is used, 8-bit YUV 422 otherwise.
+
+	   uyvy422
+	       8-bit YUV 422.
+
+	   yuv422p10
+	       10-bit YUV 422.
+
+	   argb
+	       8-bit RGB.
+
+	   bgra
+	       8-bit RGB.
+
+	   rgb10
+	       10-bit RGB.
+
+       teletext_lines
+	   If set to nonzero, an additional teletext stream will be captured
+	   from the vertical ancillary data. Both SD PAL (576i) and HD (1080i
+	   or 1080p) sources are supported. In case of HD sources, OP47
+	   packets are decoded.
+
+	   This option is a bitmask of the SD PAL VBI lines captured,
+	   specifically lines 6 to 22, and lines 318 to 335. Line 6 is the LSB
+	   in the mask. Selected lines which do not contain teletext
+	   information will be ignored. You can use the special all constant
+	   to select all possible lines, or standard to skip lines 6, 318 and
+	   319, which are not compatible with all receivers.
+
+	   For SD sources, ffmpeg needs to be compiled with
+	   "--enable-libzvbi". For HD sources, on older (pre-4K) DeckLink card
+	   models you have to capture in 10 bit mode.
+
+       channels
+	   Defines number of audio channels to capture. Must be 2, 8 or 16.
+	   Defaults to 2.
+
+       duplex_mode
+	   Sets the decklink device duplex/profile mode. Must be unset, half,
+	   full, one_sub_device_full, one_sub_device_half,
+	   two_sub_device_full, four_sub_device_half Defaults to unset.
+
+	   Note: DeckLink SDK 11.0 have replaced the duplex property by a
+	   profile property.  For the DeckLink Duo 2 and DeckLink Quad 2, a
+	   profile is shared between any 2 sub-devices that utilize the same
+	   connectors. For the DeckLink 8K Pro, a profile is shared between
+	   all 4 sub-devices. So DeckLink 8K Pro support four profiles.
+
+	   Valid profile modes for DeckLink 8K Pro(with DeckLink SDK >= 11.0):
+	   one_sub_device_full, one_sub_device_half, two_sub_device_full,
+	   four_sub_device_half
+
+	   Valid profile modes for DeckLink Quad 2 and DeckLink Duo 2: half,
+	   full
+
+       timecode_format
+	   Timecode type to include in the frame and video stream metadata.
+	   Must be none, rp188vitc, rp188vitc2, rp188ltc, rp188hfr, rp188any,
+	   vitc, vitc2, or serial.  Defaults to none (not included).
+
+	   In order to properly support 50/60 fps timecodes, the ordering of
+	   the queried timecode types for rp188any is HFR, VITC1, VITC2 and
+	   LTC for >30 fps content. Note that this is slightly different to
+	   the ordering used by the DeckLink API, which is HFR, VITC1, LTC,
+	   VITC2.
+
+       video_input
+	   Sets the video input source. Must be unset, sdi, hdmi, optical_sdi,
+	   component, composite or s_video.  Defaults to unset.
+
+       audio_input
+	   Sets the audio input source. Must be unset, embedded, aes_ebu,
+	   analog, analog_xlr, analog_rca or microphone. Defaults to unset.
+
+       video_pts
+	   Sets the video packet timestamp source. Must be video, audio,
+	   reference, wallclock or abs_wallclock.  Defaults to video.
+
+       audio_pts
+	   Sets the audio packet timestamp source. Must be video, audio,
+	   reference, wallclock or abs_wallclock.  Defaults to audio.
+
+       draw_bars
+	   If set to true, color bars are drawn in the event of a signal loss.
+	   Defaults to true.
+
+       queue_size
+	   Sets maximum input buffer size in bytes. If the buffering reaches
+	   this value, incoming frames will be dropped.  Defaults to
+	   1073741824.
+
+       audio_depth
+	   Sets the audio sample bit depth. Must be 16 or 32.  Defaults to 16.
+
+       decklink_copyts
+	   If set to true, timestamps are forwarded as they are without
+	   removing the initial offset.  Defaults to false.
+
+       timestamp_align
+	   Capture start time alignment in seconds. If set to nonzero, input
+	   frames are dropped till the system timestamp aligns with configured
+	   value.  Alignment difference of up to one frame duration is
+	   tolerated.  This is useful for maintaining input synchronization
+	   across N different hardware devices deployed for 'N-way'
+	   redundancy. The system time of different hardware devices should be
+	   synchronized with protocols such as NTP or PTP, before using this
+	   option.  Note that this method is not foolproof. In some border
+	   cases input synchronization may not happen due to thread scheduling
+	   jitters in the OS.  Either sync could go wrong by 1 frame or in a
+	   rarer case timestamp_align seconds.	Defaults to 0.
+
+       wait_for_tc (bool)
+	   Drop frames till a frame with timecode is received. Sometimes
+	   serial timecode isn't received with the first input frame. If that
+	   happens, the stored stream timecode will be inaccurate. If this
+	   option is set to true, input frames are dropped till a frame with
+	   timecode is received.  Option timecode_format must be specified.
+	   Defaults to false.
+
+       enable_klv(bool)
+	   If set to true, extracts KLV data from VANC and outputs KLV
+	   packets.  KLV VANC packets are joined based on MID and PSC fields
+	   and aggregated into one KLV packet.	Defaults to false.
+
+       Examples
+
+       o   List input devices:
+
+		   ffmpeg -sources decklink
+
+       o   List supported formats:
+
+		   ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'
+
+       o   Capture video clip at 1080i50:
+
+		   ffmpeg -format_code Hi50 -f decklink -i 'Intensity Pro' -c:a copy -c:v copy output.avi
+
+       o   Capture video clip at 1080i50 10 bit:
+
+		   ffmpeg -raw_format yuv422p10 -format_code Hi50 -f decklink -i 'UltraStudio Mini Recorder' -c:a copy -c:v copy output.avi
+
+       o   Capture video clip at 1080i50 with 16 audio channels:
+
+		   ffmpeg -channels 16 -format_code Hi50 -f decklink -i 'UltraStudio Mini Recorder' -c:a copy -c:v copy output.avi
+
+   dshow
+       Windows DirectShow input device.
+
+       DirectShow support is enabled when FFmpeg is built with the mingw-w64
+       project.  Currently only audio and video devices are supported.
+
+       Multiple devices may be opened as separate inputs, but they may also be
+       opened on the same input, which should improve synchronism between
+       them.
+
+       The input name should be in the format:
+
+	       <TYPE>=<NAME>[:<TYPE>=<NAME>]
+
+       where TYPE can be either audio or video, and NAME is the device's name
+       or alternative name..
+
+       Options
+
+       If no options are specified, the device's defaults are used.  If the
+       device does not support the requested options, it will fail to open.
+
+       video_size
+	   Set the video size in the captured video.
+
+       framerate
+	   Set the frame rate in the captured video.
+
+       sample_rate
+	   Set the sample rate (in Hz) of the captured audio.
+
+       sample_size
+	   Set the sample size (in bits) of the captured audio.
+
+       channels
+	   Set the number of channels in the captured audio.
+
+       list_devices
+	   If set to true, print a list of devices and exit.
+
+       list_options
+	   If set to true, print a list of selected device's options and exit.
+
+       video_device_number
+	   Set video device number for devices with the same name (starts at
+	   0, defaults to 0).
+
+       audio_device_number
+	   Set audio device number for devices with the same name (starts at
+	   0, defaults to 0).
+
+       pixel_format
+	   Select pixel format to be used by DirectShow. This may only be set
+	   when the video codec is not set or set to rawvideo.
+
+       audio_buffer_size
+	   Set audio device buffer size in milliseconds (which can directly
+	   impact latency, depending on the device).  Defaults to using the
+	   audio device's default buffer size (typically some multiple of
+	   500ms).  Setting this value too low can degrade performance.  See
+	   also
+	   <http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx>
+
+       video_pin_name
+	   Select video capture pin to use by name or alternative name.
+
+       audio_pin_name
+	   Select audio capture pin to use by name or alternative name.
+
+       crossbar_video_input_pin_number
+	   Select video input pin number for crossbar device. This will be
+	   routed to the crossbar device's Video Decoder output pin.  Note
+	   that changing this value can affect future invocations (sets a new
+	   default) until system reboot occurs.
+
+       crossbar_audio_input_pin_number
+	   Select audio input pin number for crossbar device. This will be
+	   routed to the crossbar device's Audio Decoder output pin.  Note
+	   that changing this value can affect future invocations (sets a new
+	   default) until system reboot occurs.
+
+       show_video_device_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to change video filter properties and
+	   configurations manually.  Note that for crossbar devices, adjusting
+	   values in this dialog may be needed at times to toggle between PAL
+	   (25 fps) and NTSC (29.97) input frame rates, sizes, interlacing,
+	   etc.  Changing these values can enable different scan rates/frame
+	   rates and avoiding green bars at the bottom, flickering scan lines,
+	   etc.  Note that with some devices, changing these properties can
+	   also affect future invocations (sets new defaults) until system
+	   reboot occurs.
+
+       show_audio_device_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to change audio filter properties and
+	   configurations manually.
+
+       show_video_crossbar_connection_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify crossbar pin
+	   routings, when it opens a video device.
+
+       show_audio_crossbar_connection_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify crossbar pin
+	   routings, when it opens an audio device.
+
+       show_analog_tv_tuner_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify TV channels and
+	   frequencies.
+
+       show_analog_tv_tuner_audio_dialog
+	   If set to true, before capture starts, popup a display dialog to
+	   the end user, allowing them to manually modify TV audio (like mono
+	   vs. stereo, Language A,B or C).
+
+       audio_device_load
+	   Load an audio capture filter device from file instead of searching
+	   it by name. It may load additional parameters too, if the filter
+	   supports the serialization of its properties to.  To use this an
+	   audio capture source has to be specified, but it can be anything
+	   even fake one.
+
+       audio_device_save
+	   Save the currently used audio capture filter device and its
+	   parameters (if the filter supports it) to a file.  If a file with
+	   the same name exists it will be overwritten.
+
+       video_device_load
+	   Load a video capture filter device from file instead of searching
+	   it by name. It may load additional parameters too, if the filter
+	   supports the serialization of its properties to.  To use this a
+	   video capture source has to be specified, but it can be anything
+	   even fake one.
+
+       video_device_save
+	   Save the currently used video capture filter device and its
+	   parameters (if the filter supports it) to a file.  If a file with
+	   the same name exists it will be overwritten.
+
+       use_video_device_timestamps
+	   If set to false, the timestamp for video frames will be derived
+	   from the wallclock instead of the timestamp provided by the capture
+	   device. This allows working around devices that provide unreliable
+	   timestamps.
+
+       Examples
+
+       o   Print the list of DirectShow supported devices and exit:
+
+		   $ ffmpeg -list_devices true -f dshow -i dummy
+
+       o   Open video device Camera:
+
+		   $ ffmpeg -f dshow -i video="Camera"
+
+       o   Open second video device with name Camera:
+
+		   $ ffmpeg -f dshow -video_device_number 1 -i video="Camera"
+
+       o   Open video device Camera and audio device Microphone:
+
+		   $ ffmpeg -f dshow -i video="Camera":audio="Microphone"
+
+       o   Print the list of supported options in selected device and exit:
+
+		   $ ffmpeg -list_options true -f dshow -i video="Camera"
+
+       o   Specify pin names to capture by name or alternative name, specify
+	   alternative device name:
+
+		   $ ffmpeg -f dshow -audio_pin_name "Audio Out" -video_pin_name 2 -i video=video="@device_pnp_\\?\pci#ven_1a0a&dev_6200&subsys_62021461&rev_01#4&e2c7dd6&0&00e1#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}":audio="Microphone"
+
+       o   Configure a crossbar device, specifying crossbar pins, allow user
+	   to adjust video capture properties at startup:
+
+		   $ ffmpeg -f dshow -show_video_device_dialog true -crossbar_video_input_pin_number 0
+			-crossbar_audio_input_pin_number 3 -i video="AVerMedia BDA Analog Capture":audio="AVerMedia BDA Analog Capture"
+
+   fbdev
+       Linux framebuffer input device.
+
+       The Linux framebuffer is a graphic hardware-independent abstraction
+       layer to show graphics on a computer monitor, typically on the console.
+       It is accessed through a file device node, usually /dev/fb0.
+
+       For more detailed information read the file
+       Documentation/fb/framebuffer.txt included in the Linux source tree.
+
+       See also <http://linux-fbdev.sourceforge.net/>, and fbset(1).
+
+       To record from the framebuffer device /dev/fb0 with ffmpeg:
+
+	       ffmpeg -f fbdev -framerate 10 -i /dev/fb0 out.avi
+
+       You can take a single screenshot image with the command:
+
+	       ffmpeg -f fbdev -framerate 1 -i /dev/fb0 -frames:v 1 screenshot.jpeg
+
+       Options
+
+       framerate
+	   Set the frame rate. Default is 25.
+
+   gdigrab
+       Win32 GDI-based screen capture device.
+
+       This device allows you to capture a region of the display on Windows.
+
+       Amongst options for the imput filenames are such elements as:
+
+	       desktop
+
+       or
+
+	       title=<window_title>
+
+       or
+
+	       hwnd=<window_hwnd>
+
+       The first option will capture the entire desktop, or a fixed region of
+       the desktop. The second and third options will instead capture the
+       contents of a single window, regardless of its position on the screen.
+
+       For example, to grab the entire desktop using ffmpeg:
+
+	       ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg
+
+       Grab a 640x480 region at position "10,20":
+
+	       ffmpeg -f gdigrab -framerate 6 -offset_x 10 -offset_y 20 -video_size vga -i desktop out.mpg
+
+       Grab the contents of the window named "Calculator"
+
+	       ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg
+
+       Options
+
+       draw_mouse
+	   Specify whether to draw the mouse pointer. Use the value 0 to not
+	   draw the pointer. Default value is 1.
+
+       framerate
+	   Set the grabbing frame rate. Default value is "ntsc", corresponding
+	   to a frame rate of "30000/1001".
+
+       show_region
+	   Show grabbed region on screen.
+
+	   If show_region is specified with 1, then the grabbing region will
+	   be indicated on screen. With this option, it is easy to know what
+	   is being grabbed if only a portion of the screen is grabbed.
+
+	   Note that show_region is incompatible with grabbing the contents of
+	   a single window.
+
+	   For example:
+
+		   ffmpeg -f gdigrab -show_region 1 -framerate 6 -video_size cif -offset_x 10 -offset_y 20 -i desktop out.mpg
+
+       video_size
+	   Set the video frame size. The default is to capture the full screen
+	   if desktop is selected, or the full window size if
+	   title=window_title is selected.
+
+       offset_x
+	   When capturing a region with video_size, set the distance from the
+	   left edge of the screen or desktop.
+
+	   Note that the offset calculation is from the top left corner of the
+	   primary monitor on Windows. If you have a monitor positioned to the
+	   left of your primary monitor, you will need to use a negative
+	   offset_x value to move the region to that monitor.
+
+       offset_y
+	   When capturing a region with video_size, set the distance from the
+	   top edge of the screen or desktop.
+
+	   Note that the offset calculation is from the top left corner of the
+	   primary monitor on Windows. If you have a monitor positioned above
+	   your primary monitor, you will need to use a negative offset_y
+	   value to move the region to that monitor.
+
+   iec61883
+       FireWire DV/HDV input device using libiec61883.
+
+       To enable this input device, you need libiec61883, libraw1394 and
+       libavc1394 installed on your system. Use the configure option
+       "--enable-libiec61883" to compile with the device enabled.
+
+       The iec61883 capture device supports capturing from a video device
+       connected via IEEE1394 (FireWire), using libiec61883 and the new Linux
+       FireWire stack (juju). This is the default DV/HDV input method in Linux
+       Kernel 2.6.37 and later, since the old FireWire stack was removed.
+
+       Specify the FireWire port to be used as input file, or "auto" to choose
+       the first port connected.
+
+       Options
+
+       dvtype
+	   Override autodetection of DV/HDV. This should only be used if auto
+	   detection does not work, or if usage of a different device type
+	   should be prohibited. Treating a DV device as HDV (or vice versa)
+	   will not work and result in undefined behavior.  The values auto,
+	   dv and hdv are supported.
+
+       dvbuffer
+	   Set maximum size of buffer for incoming data, in frames. For DV,
+	   this is an exact value. For HDV, it is not frame exact, since HDV
+	   does not have a fixed frame size.
+
+       dvguid
+	   Select the capture device by specifying its GUID. Capturing will
+	   only be performed from the specified device and fails if no device
+	   with the given GUID is found. This is useful to select the input if
+	   multiple devices are connected at the same time.  Look at
+	   /sys/bus/firewire/devices to find out the GUIDs.
+
+       Examples
+
+       o   Grab and show the input of a FireWire DV/HDV device.
+
+		   ffplay -f iec61883 -i auto
+
+       o   Grab and record the input of a FireWire DV/HDV device, using a
+	   packet buffer of 100000 packets if the source is HDV.
+
+		   ffmpeg -f iec61883 -i auto -dvbuffer 100000 out.mpg
+
+   jack
+       JACK input device.
+
+       To enable this input device during configuration you need libjack
+       installed on your system.
+
+       A JACK input device creates one or more JACK writable clients, one for
+       each audio channel, with name client_name:input_N, where client_name is
+       the name provided by the application, and N is a number which
+       identifies the channel.	Each writable client will send the acquired
+       data to the FFmpeg input device.
+
+       Once you have created one or more JACK readable clients, you need to
+       connect them to one or more JACK writable clients.
+
+       To connect or disconnect JACK clients you can use the jack_connect and
+       jack_disconnect programs, or do it through a graphical interface, for
+       example with qjackctl.
+
+       To list the JACK clients and their properties you can invoke the
+       command jack_lsp.
+
+       Follows an example which shows how to capture a JACK readable client
+       with ffmpeg.
+
+	       # Create a JACK writable client with name "ffmpeg".
+	       $ ffmpeg -f jack -i ffmpeg -y out.wav
+
+	       # Start the sample jack_metro readable client.
+	       $ jack_metro -b 120 -d 0.2 -f 4000
+
+	       # List the current JACK clients.
+	       $ jack_lsp -c
+	       system:capture_1
+	       system:capture_2
+	       system:playback_1
+	       system:playback_2
+	       ffmpeg:input_1
+	       metro:120_bpm
+
+	       # Connect metro to the ffmpeg writable client.
+	       $ jack_connect metro:120_bpm ffmpeg:input_1
+
+       For more information read: <http://jackaudio.org/>
+
+       Options
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   kmsgrab
+       KMS video input device.
+
+       Captures the KMS scanout framebuffer associated with a specified CRTC
+       or plane as a DRM object that can be passed to other hardware
+       functions.
+
+       Requires either DRM master or CAP_SYS_ADMIN to run.
+
+       If you don't understand what all of that means, you probably don't want
+       this.  Look at x11grab instead.
+
+       Options
+
+       device
+	   DRM device to capture on.  Defaults to /dev/dri/card0.
+
+       format
+	   Pixel format of the framebuffer.  This can be autodetected if you
+	   are running Linux 5.7 or later, but needs to be provided for
+	   earlier versions.  Defaults to bgr0, which is the most common
+	   format used by the Linux console and Xorg X server.
+
+       format_modifier
+	   Format modifier to signal on output frames.	This is necessary to
+	   import correctly into some APIs.  It can be autodetected if you are
+	   running Linux 5.7 or later, but will need to be provided explicitly
+	   when needed in earlier versions.  See the libdrm documentation for
+	   possible values.
+
+       crtc_id
+	   KMS CRTC ID to define the capture source.  The first active plane
+	   on the given CRTC will be used.
+
+       plane_id
+	   KMS plane ID to define the capture source.  Defaults to the first
+	   active plane found if neither crtc_id nor plane_id are specified.
+
+       framerate
+	   Framerate to capture at.  This is not synchronised to any page
+	   flipping or framebuffer changes - it just defines the interval at
+	   which the framebuffer is sampled.  Sampling faster than the
+	   framebuffer update rate will generate independent frames with the
+	   same content.  Defaults to 30.
+
+       Examples
+
+       o   Capture from the first active plane, download the result to normal
+	   frames and encode.  This will only work if the framebuffer is both
+	   linear and mappable - if not, the result may be scrambled or fail
+	   to download.
+
+		   ffmpeg -f kmsgrab -i - -vf 'hwdownload,format=bgr0' output.mp4
+
+       o   Capture from CRTC ID 42 at 60fps, map the result to VAAPI, convert
+	   to NV12 and encode as H.264.
+
+		   ffmpeg -crtc_id 42 -framerate 60 -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,scale_vaapi=w=1920:h=1080:format=nv12' -c:v h264_vaapi output.mp4
+
+       o   To capture only part of a plane the output can be cropped - this
+	   can be used to capture a single window, as long as it has a known
+	   absolute position and size.	For example, to capture and encode the
+	   middle quarter of a 1920x1080 plane:
+
+		   ffmpeg -f kmsgrab -i - -vf 'hwmap=derive_device=vaapi,crop=960:540:480:270,scale_vaapi=960:540:nv12' -c:v h264_vaapi output.mp4
+
+   lavfi
+       Libavfilter input virtual device.
+
+       This input device reads data from the open output pads of a libavfilter
+       filtergraph.
+
+       For each filtergraph open output, the input device will create a
+       corresponding stream which is mapped to the generated output.  The
+       filtergraph is specified through the option graph.
+
+       Options
+
+       graph
+	   Specify the filtergraph to use as input. Each video open output
+	   must be labelled by a unique string of the form "outN", where N is
+	   a number starting from 0 corresponding to the mapped input stream
+	   generated by the device.  The first unlabelled output is
+	   automatically assigned to the "out0" label, but all the others need
+	   to be specified explicitly.
+
+	   The suffix "+subcc" can be appended to the output label to create
+	   an extra stream with the closed captions packets attached to that
+	   output (experimental; only for EIA-608 / CEA-708 for now).  The
+	   subcc streams are created after all the normal streams, in the
+	   order of the corresponding stream.  For example, if there is
+	   "out19+subcc", "out7+subcc" and up to "out42", the stream #43 is
+	   subcc for stream #7 and stream #44 is subcc for stream #19.
+
+	   If not specified defaults to the filename specified for the input
+	   device.
+
+       graph_file
+	   Set the filename of the filtergraph to be read and sent to the
+	   other filters. Syntax of the filtergraph is the same as the one
+	   specified by the option graph.
+
+       dumpgraph
+	   Dump graph to stderr.
+
+       Examples
+
+       o   Create a color video stream and play it back with ffplay:
+
+		   ffplay -f lavfi -graph "color=c=pink [out0]" dummy
+
+       o   As the previous example, but use filename for specifying the graph
+	   description, and omit the "out0" label:
+
+		   ffplay -f lavfi color=c=pink
+
+       o   Create three different video test filtered sources and play them:
+
+		   ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate [out2]" test3
+
+       o   Read an audio stream from a file using the amovie source and play
+	   it back with ffplay:
+
+		   ffplay -f lavfi "amovie=test.wav"
+
+       o   Read an audio stream and a video stream and play it back with
+	   ffplay:
+
+		   ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]"
+
+       o   Dump decoded frames to images and closed captions to a file
+	   (experimental):
+
+		   ffmpeg -f lavfi -i "movie=test.ts[out0+subcc]" -map v frame%08d.png -map s -c copy -f rawvideo subcc.bin
+
+   libcdio
+       Audio-CD input device based on libcdio.
+
+       To enable this input device during configuration you need libcdio
+       installed on your system. It requires the configure option
+       "--enable-libcdio".
+
+       This device allows playing and grabbing from an Audio-CD.
+
+       For example to copy with ffmpeg the entire Audio-CD in /dev/sr0, you
+       may run the command:
+
+	       ffmpeg -f libcdio -i /dev/sr0 cd.wav
+
+       Options
+
+       speed
+	   Set drive reading speed. Default value is 0.
+
+	   The speed is specified CD-ROM speed units. The speed is set through
+	   the libcdio "cdio_cddap_speed_set" function. On many CD-ROM drives,
+	   specifying a value too large will result in using the fastest
+	   speed.
+
+       paranoia_mode
+	   Set paranoia recovery mode flags. It accepts one of the following
+	   values:
+
+	   disable
+	   verify
+	   overlap
+	   neverskip
+	   full
+
+	   Default value is disable.
+
+	   For more information about the available recovery modes, consult
+	   the paranoia project documentation.
+
+   libdc1394
+       IIDC1394 input device, based on libdc1394 and libraw1394.
+
+       Requires the configure option "--enable-libdc1394".
+
+       Options
+
+       framerate
+	   Set the frame rate. Default is "ntsc", corresponding to a frame
+	   rate of "30000/1001".
+
+       pixel_format
+	   Select the pixel format. Default is "uyvy422".
+
+       video_size
+	   Set the video size given as a string such as "640x480" or "hd720".
+	   Default is "qvga".
+
+   openal
+       The OpenAL input device provides audio capture on all systems with a
+       working OpenAL 1.1 implementation.
+
+       To enable this input device during configuration, you need OpenAL
+       headers and libraries installed on your system, and need to configure
+       FFmpeg with "--enable-openal".
+
+       OpenAL headers and libraries should be provided as part of your OpenAL
+       implementation, or as an additional download (an SDK). Depending on
+       your installation you may need to specify additional flags via the
+       "--extra-cflags" and "--extra-ldflags" for allowing the build system to
+       locate the OpenAL headers and libraries.
+
+       An incomplete list of OpenAL implementations follows:
+
+       Creative
+	   The official Windows implementation, providing hardware
+	   acceleration with supported devices and software fallback.  See
+	   <http://openal.org/>.
+
+       OpenAL Soft
+	   Portable, open source (LGPL) software implementation. Includes
+	   backends for the most common sound APIs on the Windows, Linux,
+	   Solaris, and BSD operating systems.	See
+	   <http://kcat.strangesoft.net/openal.html>.
+
+       Apple
+	   OpenAL is part of Core Audio, the official Mac OS X Audio
+	   interface.  See
+	   <http://developer.apple.com/technologies/mac/audio-and-video.html>
+
+       This device allows one to capture from an audio input device handled
+       through OpenAL.
+
+       You need to specify the name of the device to capture in the provided
+       filename. If the empty string is provided, the device will
+       automatically select the default device. You can get the list of the
+       supported devices by using the option list_devices.
+
+       Options
+
+       channels
+	   Set the number of channels in the captured audio. Only the values 1
+	   (monaural) and 2 (stereo) are currently supported.  Defaults to 2.
+
+       sample_size
+	   Set the sample size (in bits) of the captured audio. Only the
+	   values 8 and 16 are currently supported. Defaults to 16.
+
+       sample_rate
+	   Set the sample rate (in Hz) of the captured audio.  Defaults to
+	   44.1k.
+
+       list_devices
+	   If set to true, print a list of devices and exit.  Defaults to
+	   false.
+
+       Examples
+
+       Print the list of OpenAL supported devices and exit:
+
+	       $ ffmpeg -list_devices true -f openal -i dummy out.ogg
+
+       Capture from the OpenAL device DR-BT101 via PulseAudio:
+
+	       $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out.ogg
+
+       Capture from the default device (note the empty string '' as filename):
+
+	       $ ffmpeg -f openal -i '' out.ogg
+
+       Capture from two devices simultaneously, writing to two different
+       files, within the same ffmpeg command:
+
+	       $ ffmpeg -f openal -i 'DR-BT101 via PulseAudio' out1.ogg -f openal -i 'ALSA Default' out2.ogg
+
+       Note: not all OpenAL implementations support multiple simultaneous
+       capture - try the latest OpenAL Soft if the above does not work.
+
+   oss
+       Open Sound System input device.
+
+       The filename to provide to the input device is the device node
+       representing the OSS input device, and is usually set to /dev/dsp.
+
+       For example to grab from /dev/dsp using ffmpeg use the command:
+
+	       ffmpeg -f oss -i /dev/dsp /tmp/oss.wav
+
+       For more information about OSS see:
+       <http://manuals.opensound.com/usersguide/dsp.html>
+
+       Options
+
+       sample_rate
+	   Set the sample rate in Hz. Default is 48000.
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   pulse
+       PulseAudio input device.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-libpulse".
+
+       The filename to provide to the input device is a source device or the
+       string "default"
+
+       To list the PulseAudio source devices and their properties you can
+       invoke the command pactl list sources.
+
+       More information about PulseAudio can be found on
+       <http://www.pulseaudio.org>.
+
+       Options
+
+       server
+	   Connect to a specific PulseAudio server, specified by an IP
+	   address.  Default server is used when not provided.
+
+       name
+	   Specify the application name PulseAudio will use when showing
+	   active clients, by default it is the "LIBAVFORMAT_IDENT" string.
+
+       stream_name
+	   Specify the stream name PulseAudio will use when showing active
+	   streams, by default it is "record".
+
+       sample_rate
+	   Specify the samplerate in Hz, by default 48kHz is used.
+
+       channels
+	   Specify the channels in use, by default 2 (stereo) is set.
+
+       frame_size
+	   This option does nothing and is deprecated.
+
+       fragment_size
+	   Specify the size in bytes of the minimal buffering fragment in
+	   PulseAudio, it will affect the audio latency. By default it is set
+	   to 50 ms amount of data.
+
+       wallclock
+	   Set the initial PTS using the current time. Default is 1.
+
+       Examples
+
+       Record a stream from default device:
+
+	       ffmpeg -f pulse -i default /tmp/pulse.wav
+
+   sndio
+       sndio input device.
+
+       To enable this input device during configuration you need libsndio
+       installed on your system.
+
+       The filename to provide to the input device is the device node
+       representing the sndio input device, and is usually set to /dev/audio0.
+
+       For example to grab from /dev/audio0 using ffmpeg use the command:
+
+	       ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav
+
+       Options
+
+       sample_rate
+	   Set the sample rate in Hz. Default is 48000.
+
+       channels
+	   Set the number of channels. Default is 2.
+
+   video4linux2, v4l2
+       Video4Linux2 input video device.
+
+       "v4l2" can be used as alias for "video4linux2".
+
+       If FFmpeg is built with v4l-utils support (by using the
+       "--enable-libv4l2" configure option), it is possible to use it with the
+       "-use_libv4l2" input device option.
+
+       The name of the device to grab is a file device node, usually Linux
+       systems tend to automatically create such nodes when the device (e.g.
+       an USB webcam) is plugged into the system, and has a name of the kind
+       /dev/videoN, where N is a number associated to the device.
+
+       Video4Linux2 devices usually support a limited set of widthxheight
+       sizes and frame rates. You can check which are supported using
+       -list_formats all for Video4Linux2 devices.  Some devices, like TV
+       cards, support one or more standards. It is possible to list all the
+       supported standards using -list_standards all.
+
+       The time base for the timestamps is 1 microsecond. Depending on the
+       kernel version and configuration, the timestamps may be derived from
+       the real time clock (origin at the Unix Epoch) or the monotonic clock
+       (origin usually at boot time, unaffected by NTP or manual changes to
+       the clock). The -timestamps abs or -ts abs option can be used to force
+       conversion into the real time clock.
+
+       Some usage examples of the video4linux2 device with ffmpeg and ffplay:
+
+       o   List supported formats for a video4linux2 device:
+
+		   ffplay -f video4linux2 -list_formats all /dev/video0
+
+       o   Grab and show the input of a video4linux2 device:
+
+		   ffplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0
+
+       o   Grab and record the input of a video4linux2 device, leave the frame
+	   rate and size as previously set:
+
+		   ffmpeg -f video4linux2 -input_format mjpeg -i /dev/video0 out.mpeg
+
+       For more information about Video4Linux, check <http://linuxtv.org/>.
+
+       Options
+
+       standard
+	   Set the standard. Must be the name of a supported standard. To get
+	   a list of the supported standards, use the list_standards option.
+
+       channel
+	   Set the input channel number. Default to -1, which means using the
+	   previously selected channel.
+
+       video_size
+	   Set the video frame size. The argument must be a string in the form
+	   WIDTHxHEIGHT or a valid size abbreviation.
+
+       pixel_format
+	   Select the pixel format (only valid for raw video input).
+
+       input_format
+	   Set the preferred pixel format (for raw video) or a codec name.
+	   This option allows one to select the input format, when several are
+	   available.
+
+       framerate
+	   Set the preferred video frame rate.
+
+       list_formats
+	   List available formats (supported pixel formats, codecs, and frame
+	   sizes) and exit.
+
+	   Available values are:
+
+	   all Show all available (compressed and non-compressed) formats.
+
+	   raw Show only raw video (non-compressed) formats.
+
+	   compressed
+	       Show only compressed formats.
+
+       list_standards
+	   List supported standards and exit.
+
+	   Available values are:
+
+	   all Show all supported standards.
+
+       timestamps, ts
+	   Set type of timestamps for grabbed frames.
+
+	   Available values are:
+
+	   default
+	       Use timestamps from the kernel.
+
+	   abs Use absolute timestamps (wall clock).
+
+	   mono2abs
+	       Force conversion from monotonic to absolute timestamps.
+
+	   Default value is "default".
+
+       use_libv4l2
+	   Use libv4l2 (v4l-utils) conversion functions. Default is 0.
+
+   vfwcap
+       VfW (Video for Windows) capture input device.
+
+       The filename passed as input is the capture driver number, ranging from
+       0 to 9. You may use "list" as filename to print a list of drivers. Any
+       other filename will be interpreted as device number 0.
+
+       Options
+
+       video_size
+	   Set the video frame size.
+
+       framerate
+	   Set the grabbing frame rate. Default value is "ntsc", corresponding
+	   to a frame rate of "30000/1001".
+
+   x11grab
+       X11 video input device.
+
+       To enable this input device during configuration you need libxcb
+       installed on your system. It will be automatically detected during
+       configuration.
+
+       This device allows one to capture a region of an X11 display.
+
+       The filename passed as input has the syntax:
+
+	       [<hostname>]:<display_number>.<screen_number>[+<x_offset>,<y_offset>]
+
+       hostname:display_number.screen_number specifies the X11 display name of
+       the screen to grab from. hostname can be omitted, and defaults to
+       "localhost". The environment variable DISPLAY contains the default
+       display name.
+
+       x_offset and y_offset specify the offsets of the grabbed area with
+       respect to the top-left border of the X11 screen. They default to 0.
+
+       Check the X11 documentation (e.g. man X) for more detailed information.
+
+       Use the xdpyinfo program for getting basic information about the
+       properties of your X11 display (e.g. grep for "name" or "dimensions").
+
+       For example to grab from :0.0 using ffmpeg:
+
+	       ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0 out.mpg
+
+       Grab at position "10,20":
+
+	       ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
+
+       Options
+
+       select_region
+	   Specify whether to select the grabbing area graphically using the
+	   pointer.  A value of 1 prompts the user to select the grabbing area
+	   graphically by clicking and dragging. A single click with no
+	   dragging will select the whole screen. A region with zero width or
+	   height will also select the whole screen. This option overwrites
+	   the video_size, grab_x, and grab_y options. Default value is 0.
+
+       draw_mouse
+	   Specify whether to draw the mouse pointer. A value of 0 specifies
+	   not to draw the pointer. Default value is 1.
+
+       follow_mouse
+	   Make the grabbed area follow the mouse. The argument can be
+	   "centered" or a number of pixels PIXELS.
+
+	   When it is specified with "centered", the grabbing region follows
+	   the mouse pointer and keeps the pointer at the center of region;
+	   otherwise, the region follows only when the mouse pointer reaches
+	   within PIXELS (greater than zero) to the edge of region.
+
+	   For example:
+
+		   ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 out.mpg
+
+	   To follow only when the mouse pointer reaches within 100 pixels to
+	   edge:
+
+		   ffmpeg -f x11grab -follow_mouse 100 -framerate 25 -video_size cif -i :0.0 out.mpg
+
+       framerate
+	   Set the grabbing frame rate. Default value is "ntsc", corresponding
+	   to a frame rate of "30000/1001".
+
+       show_region
+	   Show grabbed region on screen.
+
+	   If show_region is specified with 1, then the grabbing region will
+	   be indicated on screen. With this option, it is easy to know what
+	   is being grabbed if only a portion of the screen is grabbed.
+
+       region_border
+	   Set the region border thickness if -show_region 1 is used.  Range
+	   is 1 to 128 and default is 3 (XCB-based x11grab only).
+
+	   For example:
+
+		   ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
+
+	   With follow_mouse:
+
+		   ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg
+
+       window_id
+	   Grab this window, instead of the whole screen. Default value is 0,
+	   which maps to the whole screen (root window).
+
+	   The id of a window can be found using the xwininfo program,
+	   possibly with options -tree and -root.
+
+	   If the window is later enlarged, the new area is not recorded.
+	   Video ends when the window is closed, unmapped (i.e., iconified) or
+	   shrunk beyond the video size (which defaults to the initial window
+	   size).
+
+	   This option disables options follow_mouse and select_region.
+
+       video_size
+	   Set the video frame size. Default is the full desktop or window.
+
+       grab_x
+       grab_y
+	   Set the grabbing region coordinates. They are expressed as offset
+	   from the top left corner of the X11 window and correspond to the
+	   x_offset and y_offset parameters in the device name. The default
+	   value for both options is 0.
+
+OUTPUT DEVICES
+       Output devices are configured elements in FFmpeg that can write
+       multimedia data to an output device attached to your system.
+
+       When you configure your FFmpeg build, all the supported output devices
+       are enabled by default. You can list all available ones using the
+       configure option "--list-outdevs".
+
+       You can disable all the output devices using the configure option
+       "--disable-outdevs", and selectively enable an output device using the
+       option "--enable-outdev=OUTDEV", or you can disable a particular input
+       device using the option "--disable-outdev=OUTDEV".
+
+       The option "-devices" of the ff* tools will display the list of enabled
+       output devices.
+
+       A description of the currently available output devices follows.
+
+   alsa
+       ALSA (Advanced Linux Sound Architecture) output device.
+
+       Examples
+
+       o   Play a file on default ALSA device:
+
+		   ffmpeg -i INPUT -f alsa default
+
+       o   Play a file on soundcard 1, audio device 7:
+
+		   ffmpeg -i INPUT -f alsa hw:1,7
+
+   AudioToolbox
+       AudioToolbox output device.
+
+       Allows native output to CoreAudio devices on OSX.
+
+       The output filename can be empty (or "-") to refer to the default
+       system output device or a number that refers to the device index as
+       shown using: "-list_devices true".
+
+       Alternatively, the audio input device can be chosen by index using the
+
+	   B<-audio_device_index E<lt>INDEXE<gt>>
+
+       , overriding any device name or index given in the input filename.
+
+       All available devices can be enumerated by using -list_devices true,
+       listing all device names, UIDs and corresponding indices.
+
+       Options
+
+       AudioToolbox supports the following options:
+
+       -audio_device_index <INDEX>
+	   Specify the audio device by its index. Overrides anything given in
+	   the output filename.
+
+       Examples
+
+       o   Print the list of supported devices and output a sine wave to the
+	   default device:
+
+		   $ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -list_devices true -
+
+       o   Output a sine wave to the device with the index 2, overriding any
+	   output filename:
+
+		   $ ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -audio_device_index 2 -
+
+   caca
+       CACA output device.
+
+       This output device allows one to show a video stream in CACA window.
+       Only one CACA window is allowed per application, so you can have only
+       one instance of this output device in an application.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-libcaca".  libcaca is a graphics library that outputs text
+       instead of pixels.
+
+       For more information about libcaca, check:
+       <http://caca.zoy.org/wiki/libcaca>
+
+       Options
+
+       window_title
+	   Set the CACA window title, if not specified default to the filename
+	   specified for the output device.
+
+       window_size
+	   Set the CACA window size, can be a string of the form widthxheight
+	   or a video size abbreviation.  If not specified it defaults to the
+	   size of the input video.
+
+       driver
+	   Set display driver.
+
+       algorithm
+	   Set dithering algorithm. Dithering is necessary because the picture
+	   being rendered has usually far more colours than the available
+	   palette.  The accepted values are listed with "-list_dither
+	   algorithms".
+
+       antialias
+	   Set antialias method. Antialiasing smoothens the rendered image and
+	   avoids the commonly seen staircase effect.  The accepted values are
+	   listed with "-list_dither antialiases".
+
+       charset
+	   Set which characters are going to be used when rendering text.  The
+	   accepted values are listed with "-list_dither charsets".
+
+       color
+	   Set color to be used when rendering text.  The accepted values are
+	   listed with "-list_dither colors".
+
+       list_drivers
+	   If set to true, print a list of available drivers and exit.
+
+       list_dither
+	   List available dither options related to the argument.  The
+	   argument must be one of "algorithms", "antialiases", "charsets",
+	   "colors".
+
+       Examples
+
+       o   The following command shows the ffmpeg output is an CACA window,
+	   forcing its size to 80x25:
+
+		   ffmpeg -i INPUT -c:v rawvideo -pix_fmt rgb24 -window_size 80x25 -f caca -
+
+       o   Show the list of available drivers and exit:
+
+		   ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers true -
+
+       o   Show the list of available dither colors and exit:
+
+		   ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
+
+   decklink
+       The decklink output device provides playback capabilities for
+       Blackmagic DeckLink devices.
+
+       To enable this output device, you need the Blackmagic DeckLink SDK and
+       you need to configure with the appropriate "--extra-cflags" and
+       "--extra-ldflags".  On Windows, you need to run the IDL files through
+       widl.
+
+       DeckLink is very picky about the formats it supports. Pixel format is
+       always uyvy422, framerate, field order and video size must be
+       determined for your device with -list_formats 1. Audio sample rate is
+       always 48 kHz.
+
+       Options
+
+       list_devices
+	   If set to true, print a list of devices and exit.  Defaults to
+	   false. This option is deprecated, please use the "-sinks" option of
+	   ffmpeg to list the available output devices.
+
+       list_formats
+	   If set to true, print a list of supported formats and exit.
+	   Defaults to false.
+
+       preroll
+	   Amount of time to preroll video in seconds.	Defaults to 0.5.
+
+       duplex_mode
+	   Sets the decklink device duplex/profile mode. Must be unset, half,
+	   full, one_sub_device_full, one_sub_device_half,
+	   two_sub_device_full, four_sub_device_half Defaults to unset.
+
+	   Note: DeckLink SDK 11.0 have replaced the duplex property by a
+	   profile property.  For the DeckLink Duo 2 and DeckLink Quad 2, a
+	   profile is shared between any 2 sub-devices that utilize the same
+	   connectors. For the DeckLink 8K Pro, a profile is shared between
+	   all 4 sub-devices. So DeckLink 8K Pro support four profiles.
+
+	   Valid profile modes for DeckLink 8K Pro(with DeckLink SDK >= 11.0):
+	   one_sub_device_full, one_sub_device_half, two_sub_device_full,
+	   four_sub_device_half
+
+	   Valid profile modes for DeckLink Quad 2 and DeckLink Duo 2: half,
+	   full
+
+       timing_offset
+	   Sets the genlock timing pixel offset on the used output.  Defaults
+	   to unset.
+
+       link
+	   Sets the SDI video link configuration on the used output. Must be
+	   unset, single link SDI, dual link SDI or quad link SDI.  Defaults
+	   to unset.
+
+       sqd Enable Square Division Quad Split mode for Quad-link SDI output.
+	   Must be unset, true or false.  Defaults to unset.
+
+       level_a
+	   Enable SMPTE Level A mode on the used output.  Must be unset, true
+	   or false.  Defaults to unset.
+
+       vanc_queue_size
+	   Sets maximum output buffer size in bytes for VANC data. If the
+	   buffering reaches this value, outgoing VANC data will be dropped.
+	   Defaults to 1048576.
+
+       Examples
+
+       o   List output devices:
+
+		   ffmpeg -sinks decklink
+
+       o   List supported formats:
+
+		   ffmpeg -i test.avi -f decklink -list_formats 1 'DeckLink Mini Monitor'
+
+       o   Play video clip:
+
+		   ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 'DeckLink Mini Monitor'
+
+       o   Play video clip with non-standard framerate or video size:
+
+		   ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 -s 720x486 -r 24000/1001 'DeckLink Mini Monitor'
+
+   fbdev
+       Linux framebuffer output device.
+
+       The Linux framebuffer is a graphic hardware-independent abstraction
+       layer to show graphics on a computer monitor, typically on the console.
+       It is accessed through a file device node, usually /dev/fb0.
+
+       For more detailed information read the file
+       Documentation/fb/framebuffer.txt included in the Linux source tree.
+
+       Options
+
+       xoffset
+       yoffset
+	   Set x/y coordinate of top left corner. Default is 0.
+
+       Examples
+
+       Play a file on framebuffer device /dev/fb0.  Required pixel format
+       depends on current framebuffer settings.
+
+	       ffmpeg -re -i INPUT -c:v rawvideo -pix_fmt bgra -f fbdev /dev/fb0
+
+       See also <http://linux-fbdev.sourceforge.net/>, and fbset(1).
+
+   opengl
+       OpenGL output device. Deprecated and will be removed.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-opengl".
+
+       This output device allows one to render to OpenGL context.  Context may
+       be provided by application or default SDL window is created.
+
+       When device renders to external context, application must implement
+       handlers for following messages: "AV_DEV_TO_APP_CREATE_WINDOW_BUFFER" -
+       create OpenGL context on current thread.
+       "AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER" - make OpenGL context current.
+       "AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER" - swap buffers.
+       "AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER" - destroy OpenGL context.
+       Application is also required to inform a device about current
+       resolution by sending "AV_APP_TO_DEV_WINDOW_SIZE" message.
+
+       Options
+
+       background
+	   Set background color. Black is a default.
+
+       no_window
+	   Disables default SDL window when set to non-zero value.
+	   Application must provide OpenGL context and both "window_size_cb"
+	   and "window_swap_buffers_cb" callbacks when set.
+
+       window_title
+	   Set the SDL window title, if not specified default to the filename
+	   specified for the output device.  Ignored when no_window is set.
+
+       window_size
+	   Set preferred window size, can be a string of the form widthxheight
+	   or a video size abbreviation.  If not specified it defaults to the
+	   size of the input video, downscaled according to the aspect ratio.
+	   Mostly usable when no_window is not set.
+
+       Examples
+
+       Play a file on SDL window using OpenGL rendering:
+
+	       ffmpeg  -i INPUT -f opengl "window title"
+
+   oss
+       OSS (Open Sound System) output device.
+
+   pulse
+       PulseAudio output device.
+
+       To enable this output device you need to configure FFmpeg with
+       "--enable-libpulse".
+
+       More information about PulseAudio can be found on
+       <http://www.pulseaudio.org>
+
+       Options
+
+       server
+	   Connect to a specific PulseAudio server, specified by an IP
+	   address.  Default server is used when not provided.
+
+       name
+	   Specify the application name PulseAudio will use when showing
+	   active clients, by default it is the "LIBAVFORMAT_IDENT" string.
+
+       stream_name
+	   Specify the stream name PulseAudio will use when showing active
+	   streams, by default it is set to the specified output name.
+
+       device
+	   Specify the device to use. Default device is used when not
+	   provided.  List of output devices can be obtained with command
+	   pactl list sinks.
+
+       buffer_size
+       buffer_duration
+	   Control the size and duration of the PulseAudio buffer. A small
+	   buffer gives more control, but requires more frequent updates.
+
+	   buffer_size specifies size in bytes while buffer_duration specifies
+	   duration in milliseconds.
+
+	   When both options are provided then the highest value is used
+	   (duration is recalculated to bytes using stream parameters). If
+	   they are set to 0 (which is default), the device will use the
+	   default PulseAudio duration value. By default PulseAudio set buffer
+	   duration to around 2 seconds.
+
+       prebuf
+	   Specify pre-buffering size in bytes. The server does not start with
+	   playback before at least prebuf bytes are available in the buffer.
+	   By default this option is initialized to the same value as
+	   buffer_size or buffer_duration (whichever is bigger).
+
+       minreq
+	   Specify minimum request size in bytes. The server does not request
+	   less than minreq bytes from the client, instead waits until the
+	   buffer is free enough to request more bytes at once. It is
+	   recommended to not set this option, which will initialize this to a
+	   value that is deemed sensible by the server.
+
+       Examples
+
+       Play a file on default device on default server:
+
+	       ffmpeg  -i INPUT -f pulse "stream name"
+
+   sdl
+       SDL (Simple DirectMedia Layer) output device. Deprecated and will be
+       removed.
+
+       For monitoring purposes in FFmpeg, pipes and a video player such as
+       ffplay can be used:
+
+	       ffmpeg -i INPUT -f nut -c:v rawvideo - | ffplay -
+
+       "sdl2" can be used as alias for "sdl".
+
+       This output device allows one to show a video stream in an SDL window.
+       Only one SDL window is allowed per application, so you can have only
+       one instance of this output device in an application.
+
+       To enable this output device you need libsdl installed on your system
+       when configuring your build.
+
+       For more information about SDL, check: <http://www.libsdl.org/>
+
+       Options
+
+       window_borderless
+	   Set SDL window border off.  Default value is 0 (enable window
+	   border).
+
+       window_enable_quit
+	   Enable quit action (using window button or keyboard key) when non-
+	   zero value is provided.  Default value is 1 (enable quit action).
+
+       window_fullscreen
+	   Set fullscreen mode when non-zero value is provided.  Default value
+	   is zero.
+
+       window_size
+	   Set the SDL window size, can be a string of the form widthxheight
+	   or a video size abbreviation.  If not specified it defaults to the
+	   size of the input video, downscaled according to the aspect ratio.
+
+       window_title
+	   Set the SDL window title, if not specified default to the filename
+	   specified for the output device.
+
+       window_x
+       window_y
+	   Set the position of the window on the screen.
+
+       Interactive commands
+
+       The window created by the device can be controlled through the
+       following interactive commands.
+
+       q, ESC
+	   Quit the device immediately.
+
+       Examples
+
+       The following command shows the ffmpeg output is an SDL window, forcing
+       its size to the qcif format:
+
+	       ffmpeg -i INPUT -c:v rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL output"
+
+   sndio
+       sndio audio output device.
+
+   v4l2
+       Video4Linux2 output device.
+
+   xv
+       XV (XVideo) output device.
+
+       This output device allows one to show a video stream in a X Window
+       System window.
+
+       Options
+
+       display_name
+	   Specify the hardware display name, which determines the display and
+	   communications domain to be used.
+
+	   The display name or DISPLAY environment variable can be a string in
+	   the format hostname[:number[.screen_number]].
+
+	   hostname specifies the name of the host machine on which the
+	   display is physically attached. number specifies the number of the
+	   display server on that host machine. screen_number specifies the
+	   screen to be used on that server.
+
+	   If unspecified, it defaults to the value of the DISPLAY environment
+	   variable.
+
+	   For example, "dual-headed:0.1" would specify screen 1 of display 0
+	   on the machine named ``dual-headed''.
+
+	   Check the X11 specification for more detailed information about the
+	   display name format.
+
+       window_id
+	   When set to non-zero value then device doesn't create new window,
+	   but uses existing one with provided window_id. By default this
+	   options is set to zero and device creates its own window.
+
+       window_size
+	   Set the created window size, can be a string of the form
+	   widthxheight or a video size abbreviation. If not specified it
+	   defaults to the size of the input video.  Ignored when window_id is
+	   set.
+
+       window_x
+       window_y
+	   Set the X and Y window offsets for the created window. They are
+	   both set to 0 by default. The values may be ignored by the window
+	   manager.  Ignored when window_id is set.
+
+       window_title
+	   Set the window title, if not specified default to the filename
+	   specified for the output device. Ignored when window_id is set.
+
+       For more information about XVideo see <http://www.x.org/>.
+
+       Examples
+
+       o   Decode, display and encode video input with ffmpeg at the same
+	   time:
+
+		   ffmpeg -i INPUT OUTPUT -f xv display
+
+       o   Decode and display the input video to multiple X11 windows:
+
+		   ffmpeg -i INPUT -f xv normal -vf negate -f xv negated
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libavdevice(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							     FFMPEG-DEVICES(1)
diff --git a/ffmpeg/manpages/ffmpeg-filters.txt b/ffmpeg/manpages/ffmpeg-filters.txt
new file mode 100644
index 0000000000000000000000000000000000000000..5cfd096582025ee85839b2fbaec662e13b3b0409
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-filters.txt
@@ -0,0 +1,29369 @@
+FFMPEG-FILTERS(1)					     FFMPEG-FILTERS(1)
+
+NAME
+       ffmpeg-filters - FFmpeg filters
+
+DESCRIPTION
+       This document describes filters, sources, and sinks provided by the
+       libavfilter library.
+
+FILTERING INTRODUCTION
+       Filtering in FFmpeg is enabled through the libavfilter library.
+
+       In libavfilter, a filter can have multiple inputs and multiple outputs.
+       To illustrate the sorts of things that are possible, we consider the
+       following filtergraph.
+
+			       [main]
+	       input --> split ---------------------> overlay --> output
+			   |				 ^
+			   |[tmp]		   [flip]|
+			   +-----> crop --> vflip -------+
+
+       This filtergraph splits the input stream in two streams, then sends one
+       stream through the crop filter and the vflip filter, before merging it
+       back with the other stream by overlaying it on top. You can use the
+       following command to achieve this:
+
+	       ffmpeg -i INPUT -vf "split [main][tmp]; [tmp] crop=iw:ih/2:0:0, vflip [flip]; [main][flip] overlay=0:H/2" OUTPUT
+
+       The result will be that the top half of the video is mirrored onto the
+       bottom half of the output video.
+
+       Filters in the same linear chain are separated by commas, and distinct
+       linear chains of filters are separated by semicolons. In our example,
+       crop,vflip are in one linear chain, split and overlay are separately in
+       another. The points where the linear chains join are labelled by names
+       enclosed in square brackets. In the example, the split filter generates
+       two outputs that are associated to the labels [main] and [tmp].
+
+       The stream sent to the second output of split, labelled as [tmp], is
+       processed through the crop filter, which crops away the lower half part
+       of the video, and then vertically flipped. The overlay filter takes in
+       input the first unchanged output of the split filter (which was
+       labelled as [main]), and overlay on its lower half the output generated
+       by the crop,vflip filterchain.
+
+       Some filters take in input a list of parameters: they are specified
+       after the filter name and an equal sign, and are separated from each
+       other by a colon.
+
+       There exist so-called source filters that do not have an audio/video
+       input, and sink filters that will not have audio/video output.
+
+GRAPH
+       The graph2dot program included in the FFmpeg tools directory can be
+       used to parse a filtergraph description and issue a corresponding
+       textual representation in the dot language.
+
+       Invoke the command:
+
+	       graph2dot -h
+
+       to see how to use graph2dot.
+
+       You can then pass the dot description to the dot program (from the
+       graphviz suite of programs) and obtain a graphical representation of
+       the filtergraph.
+
+       For example the sequence of commands:
+
+	       echo <GRAPH_DESCRIPTION> | \
+	       tools/graph2dot -o graph.tmp && \
+	       dot -Tpng graph.tmp -o graph.png && \
+	       display graph.png
+
+       can be used to create and display an image representing the graph
+       described by the GRAPH_DESCRIPTION string. Note that this string must
+       be a complete self-contained graph, with its inputs and outputs
+       explicitly defined.  For example if your command line is of the form:
+
+	       ffmpeg -i infile -vf scale=640:360 outfile
+
+       your GRAPH_DESCRIPTION string will need to be of the form:
+
+	       nullsrc,scale=640:360,nullsink
+
+       you may also need to set the nullsrc parameters and add a format filter
+       in order to simulate a specific input file.
+
+FILTERGRAPH DESCRIPTION
+       A filtergraph is a directed graph of connected filters. It can contain
+       cycles, and there can be multiple links between a pair of filters. Each
+       link has one input pad on one side connecting it to one filter from
+       which it takes its input, and one output pad on the other side
+       connecting it to one filter accepting its output.
+
+       Each filter in a filtergraph is an instance of a filter class
+       registered in the application, which defines the features and the
+       number of input and output pads of the filter.
+
+       A filter with no input pads is called a "source", and a filter with no
+       output pads is called a "sink".
+
+   Filtergraph syntax
+       A filtergraph has a textual representation, which is recognized by the
+       -filter/-vf/-af and -filter_complex options in ffmpeg and -vf/-af in
+       ffplay, and by the "avfilter_graph_parse_ptr()" function defined in
+       libavfilter/avfilter.h.
+
+       A filterchain consists of a sequence of connected filters, each one
+       connected to the previous one in the sequence. A filterchain is
+       represented by a list of ","-separated filter descriptions.
+
+       A filtergraph consists of a sequence of filterchains. A sequence of
+       filterchains is represented by a list of ";"-separated filterchain
+       descriptions.
+
+       A filter is represented by a string of the form:
+       [in_link_1]...[in_link_N]filter_name@id=arguments[out_link_1]...[out_link_M]
+
+       filter_name is the name of the filter class of which the described
+       filter is an instance of, and has to be the name of one of the filter
+       classes registered in the program optionally followed by "@id".	The
+       name of the filter class is optionally followed by a string
+       "=arguments".
+
+       arguments is a string which contains the parameters used to initialize
+       the filter instance. It may have one of two forms:
+
+       o   A ':'-separated list of key=value pairs.
+
+       o   A ':'-separated list of value. In this case, the keys are assumed
+	   to be the option names in the order they are declared. E.g. the
+	   "fade" filter declares three options in this order -- type,
+	   start_frame and nb_frames. Then the parameter list in:0:30 means
+	   that the value in is assigned to the option type, 0 to start_frame
+	   and 30 to nb_frames.
+
+       o   A ':'-separated list of mixed direct value and long key=value
+	   pairs. The direct value must precede the key=value pairs, and
+	   follow the same constraints order of the previous point. The
+	   following key=value pairs can be set in any preferred order.
+
+       If the option value itself is a list of items (e.g. the "format" filter
+       takes a list of pixel formats), the items in the list are usually
+       separated by |.
+
+       The list of arguments can be quoted using the character ' as initial
+       and ending mark, and the character \ for escaping the characters within
+       the quoted text; otherwise the argument string is considered terminated
+       when the next special character (belonging to the set []=;,) is
+       encountered.
+
+       A special syntax implemented in the ffmpeg CLI tool allows loading
+       option values from files. This is done be prepending a slash '/' to the
+       option name, then the supplied value is interpreted as a path from
+       which the actual value is loaded. E.g.
+
+	       ffmpeg -i <INPUT> -vf drawtext=/text=/tmp/some_text <OUTPUT>
+
+       will load the text to be drawn from /tmp/some_text. API users wishing
+       to implement a similar feature should use the
+       "avfilter_graph_segment_*()" functions together with custom IO code.
+
+       The name and arguments of the filter are optionally preceded and
+       followed by a list of link labels.  A link label allows one to name a
+       link and associate it to a filter output or input pad. The preceding
+       labels in_link_1 ... in_link_N, are associated to the filter input
+       pads, the following labels out_link_1 ... out_link_M, are associated to
+       the output pads.
+
+       When two link labels with the same name are found in the filtergraph, a
+       link between the corresponding input and output pad is created.
+
+       If an output pad is not labelled, it is linked by default to the first
+       unlabelled input pad of the next filter in the filterchain.  For
+       example in the filterchain
+
+	       nullsrc, split[L1], [L2]overlay, nullsink
+
+       the split filter instance has two output pads, and the overlay filter
+       instance two input pads. The first output pad of split is labelled
+       "L1", the first input pad of overlay is labelled "L2", and the second
+       output pad of split is linked to the second input pad of overlay, which
+       are both unlabelled.
+
+       In a filter description, if the input label of the first filter is not
+       specified, "in" is assumed; if the output label of the last filter is
+       not specified, "out" is assumed.
+
+       In a complete filterchain all the unlabelled filter input and output
+       pads must be connected. A filtergraph is considered valid if all the
+       filter input and output pads of all the filterchains are connected.
+
+       Leading and trailing whitespaces (space, tabs, or line feeds)
+       separating tokens in the filtergraph specification are ignored. This
+       means that the filtergraph can be expressed using empty lines and
+       spaces to improve redability.
+
+       For example, the filtergraph:
+
+	       testsrc,split[L1],hflip[L2];[L1][L2] hstack
+
+       can be represented as:
+
+	       testsrc,
+	       split [L1], hflip [L2];
+
+	       [L1][L2] hstack
+
+       Libavfilter will automatically insert scale filters where format
+       conversion is required. It is possible to specify swscale flags for
+       those automatically inserted scalers by prepending "sws_flags=flags;"
+       to the filtergraph description.
+
+       Here is a BNF description of the filtergraph syntax:
+
+	       <NAME>		  ::= sequence of alphanumeric characters and '_'
+	       <FILTER_NAME>	  ::= <NAME>["@"<NAME>]
+	       <LINKLABEL>	  ::= "[" <NAME> "]"
+	       <LINKLABELS>	  ::= <LINKLABEL> [<LINKLABELS>]
+	       <FILTER_ARGUMENTS> ::= sequence of chars (possibly quoted)
+	       <FILTER> 	  ::= [<LINKLABELS>] <FILTER_NAME> ["=" <FILTER_ARGUMENTS>] [<LINKLABELS>]
+	       <FILTERCHAIN>	  ::= <FILTER> [,<FILTERCHAIN>]
+	       <FILTERGRAPH>	  ::= [sws_flags=<flags>;] <FILTERCHAIN> [;<FILTERGRAPH>]
+
+   Notes on filtergraph escaping
+       Filtergraph description composition entails several levels of escaping.
+       See the "Quoting and escaping" section in the ffmpeg-utils(1) manual
+       for more information about the employed escaping procedure.
+
+       A first level escaping affects the content of each filter option value,
+       which may contain the special character ":" used to separate values, or
+       one of the escaping characters "\'".
+
+       A second level escaping affects the whole filter description, which may
+       contain the escaping characters "\'" or the special characters "[],;"
+       used by the filtergraph description.
+
+       Finally, when you specify a filtergraph on a shell commandline, you
+       need to perform a third level escaping for the shell special characters
+       contained within it.
+
+       For example, consider the following string to be embedded in the
+       drawtext filter description text value:
+
+	       this is a 'string': may contain one, or more, special characters
+
+       This string contains the "'" special escaping character, and the ":"
+       special character, so it needs to be escaped in this way:
+
+	       text=this is a \'string\'\: may contain one, or more, special characters
+
+       A second level of escaping is required when embedding the filter
+       description in a filtergraph description, in order to escape all the
+       filtergraph special characters. Thus the example above becomes:
+
+	       drawtext=text=this is a \\\'string\\\'\\: may contain one\, or more\, special characters
+
+       (note that in addition to the "\'" escaping special characters, also
+       "," needs to be escaped).
+
+       Finally an additional level of escaping is needed when writing the
+       filtergraph description in a shell command, which depends on the
+       escaping rules of the adopted shell. For example, assuming that "\" is
+       special and needs to be escaped with another "\", the previous string
+       will finally result in:
+
+	       -vf "drawtext=text=this is a \\\\\\'string\\\\\\'\\\\: may contain one\\, or more\\, special characters"
+
+       In order to avoid cumbersome escaping when using a commandline tool
+       accepting a filter specification as input, it is advisable to avoid
+       direct inclusion of the filter or options specification in the shell.
+
+       For example, in case of the drawtext filter, you might prefer to use
+       the textfile option in place of text to specify the text to render.
+
+TIMELINE EDITING
+       Some filters support a generic enable option. For the filters
+       supporting timeline editing, this option can be set to an expression
+       which is evaluated before sending a frame to the filter. If the
+       evaluation is non-zero, the filter will be enabled, otherwise the frame
+       will be sent unchanged to the next filter in the filtergraph.
+
+       The expression accepts the following values:
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       n   sequential number of the input frame, starting from 0
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       w
+       h   width and height of the input frame if video
+
+       Additionally, these filters support an enable command that can be used
+       to re-define the expression.
+
+       Like any other filtering option, the enable option follows the same
+       rules.
+
+       For example, to enable a blur filter (smartblur) from 10 seconds to 3
+       minutes, and a curves filter starting at 3 seconds:
+
+	       smartblur = enable='between(t,10,3*60)',
+	       curves	 = enable='gte(t,3)' : preset=cross_process
+
+       See "ffmpeg -filters" to view which filters have timeline support.
+
+CHANGING OPTIONS AT RUNTIME WITH A COMMAND
+       Some options can be changed during the operation of the filter using a
+       command. These options are marked 'T' on the output of ffmpeg -h
+       filter=<name of filter>.  The name of the command is the name of the
+       option and the argument is the new value.
+
+OPTIONS FOR FILTERS WITH SEVERAL INPUTS
+       Some filters with several inputs support a common set of options.
+       These options can only be set by name, not with the short notation.
+
+       eof_action
+	   The action to take when EOF is encountered on the secondary input;
+	   it accepts one of the following values:
+
+	   repeat
+	       Repeat the last frame (the default).
+
+	   endall
+	       End both streams.
+
+	   pass
+	       Pass the main input through.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+       repeatlast
+	   If set to 1, force the filter to extend the last frame of secondary
+	   streams until the end of the primary stream. A value of 0 disables
+	   this behavior.  Default value is 1.
+
+       ts_sync_mode
+	   How strictly to sync streams based on secondary input timestamps;
+	   it accepts one of the following values:
+
+	   default
+	       Frame from secondary input with the nearest lower or equal
+	       timestamp to the primary input frame.
+
+	   nearest
+	       Frame from secondary input with the absolute nearest timestamp
+	       to the primary input frame.
+
+AUDIO FILTERS
+       When you configure your FFmpeg build, you can disable any of the
+       existing filters using "--disable-filters".  The configure output will
+       show the audio filters included in your build.
+
+       Below is a description of the currently available audio filters.
+
+   aap
+       Apply Affine Projection algorithm to the first audio stream using the
+       second audio stream.
+
+       This adaptive filter is used to estimate unknown audio based on
+       multiple input audio samples.  Affine projection algorithm can make
+       trade-offs between computation complexity with convergence speed.
+
+       A description of the accepted options follows.
+
+       order
+	   Set the filter order.
+
+       projection
+	   Set the projection order.
+
+       mu  Set the filter mu.
+
+       delta
+	   Set the coefficient to initialize internal covariance matrix.
+
+       out_mode
+	   Set the filter output samples. It accepts the following values:
+
+	   i   Pass the 1st input.
+
+	   d   Pass the 2nd input.
+
+	   o   Pass difference between desired, 2nd input and error signal
+	       estimate.
+
+	   n   Pass difference between input, 1st input and error signal
+	       estimate.
+
+	   e   Pass error signal estimated samples.
+
+	       Default value is o.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+   acompressor
+       A compressor is mainly used to reduce the dynamic range of a signal.
+       Especially modern music is mostly compressed at a high ratio to improve
+       the overall loudness. It's done to get the highest attention of a
+       listener, "fatten" the sound and bring more "power" to the track.  If a
+       signal is compressed too much it may sound dull or "dead" afterwards or
+       it may start to "pump" (which could be a powerful effect but can also
+       destroy a track completely).  The right compression is the key to reach
+       a professional sound and is the high art of mixing and mastering.
+       Because of its complex settings it may take a long time to get the
+       right feeling for this kind of effect.
+
+       Compression is done by detecting the volume above a chosen level
+       "threshold" and dividing it by the factor set with "ratio".  So if you
+       set the threshold to -12dB and your signal reaches -6dB a ratio of 2:1
+       will result in a signal at -9dB. Because an exact manipulation of the
+       signal would cause distortion of the waveform the reduction can be
+       levelled over the time. This is done by setting "Attack" and "Release".
+       "attack" determines how long the signal has to rise above the threshold
+       before any reduction will occur and "release" sets the time the signal
+       has to fall below the threshold to reduce the reduction again. Shorter
+       signals than the chosen attack time will be left untouched.  The
+       overall reduction of the signal can be made up afterwards with the
+       "makeup" setting. So compressing the peaks of a signal about 6dB and
+       raising the makeup to this level results in a signal twice as loud than
+       the source. To gain a softer entry in the compression the "knee"
+       flattens the hard edge at the threshold in the range of the chosen
+       decibels.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. Default is 1. Range is between 0.015625 and 64.
+
+       mode
+	   Set mode of compressor operation. Can be "upward" or "downward".
+	   Default is "downward".
+
+       threshold
+	   If a signal of stream rises above this level it will affect the
+	   gain reduction.  By default it is 0.125. Range is between
+	   0.00097563 and 1.
+
+       ratio
+	   Set a ratio by which the signal is reduced. 1:2 means that if the
+	   level rose 4dB above the threshold, it will be only 2dB above after
+	   the reduction.  Default is 2. Range is between 1 and 20.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction starts. Default is 20. Range is between 0.01
+	   and 2000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before reduction is decreased again. Default is 250. Range is
+	   between 0.01 and 9000.
+
+       makeup
+	   Set the amount by how much signal will be amplified after
+	   processing.	Default is 1. Range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.82843. Range is between 1 and 8.
+
+       link
+	   Choose if the "average" level between all channels of input stream
+	   or the louder("maximum") channel of input stream affects the
+	   reduction. Default is "average".
+
+       detection
+	   Should the exact signal be taken in case of "peak" or an RMS one in
+	   case of "rms". Default is "rms" which is mostly smoother.
+
+       mix How much to use compressed signal in output. Default is 1.  Range
+	   is between 0 and 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   acontrast
+       Simple audio dynamic range compression/expansion filter.
+
+       The filter accepts the following options:
+
+       contrast
+	   Set contrast. Default is 33. Allowed range is between 0 and 100.
+
+   acopy
+       Copy the input audio source unchanged to the output. This is mainly
+       useful for testing purposes.
+
+   acrossfade
+       Apply cross fade from one input audio stream to another input audio
+       stream.	The cross fade is applied for specified duration near the end
+       of first stream.
+
+       The filter accepts the following options:
+
+       nb_samples, ns
+	   Specify the number of samples for which the cross fade effect has
+	   to last.  At the end of the cross fade effect the first input audio
+	   will be completely silent. Default is 44100.
+
+       duration, d
+	   Specify the duration of the cross fade effect. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  By default the duration is determined by nb_samples.  If
+	   set this option is used instead of nb_samples.
+
+       overlap, o
+	   Should first stream end overlap with second stream start. Default
+	   is enabled.
+
+       curve1
+	   Set curve for cross fade transition for first stream.
+
+       curve2
+	   Set curve for cross fade transition for second stream.
+
+	   For description of available curve types see afade filter
+	   description.
+
+       Examples
+
+       o   Cross fade from one input to another:
+
+		   ffmpeg -i first.flac -i second.flac -filter_complex acrossfade=d=10:c1=exp:c2=exp output.flac
+
+       o   Cross fade from one input to another but without overlapping:
+
+		   ffmpeg -i first.flac -i second.flac -filter_complex acrossfade=d=10:o=0:c1=exp:c2=exp output.flac
+
+   acrossover
+       Split audio stream into several bands.
+
+       This filter splits audio stream into two or more frequency ranges.
+       Summing all streams back will give flat output.
+
+       The filter accepts the following options:
+
+       split
+	   Set split frequencies. Those must be positive and increasing.
+
+       order
+	   Set filter order for each band split. This controls filter roll-off
+	   or steepness of filter transfer function.  Available values are:
+
+	   2nd 12 dB per octave.
+
+	   4th 24 dB per octave.
+
+	   6th 36 dB per octave.
+
+	   8th 48 dB per octave.
+
+	   10th
+	       60 dB per octave.
+
+	   12th
+	       72 dB per octave.
+
+	   14th
+	       84 dB per octave.
+
+	   16th
+	       96 dB per octave.
+
+	   18th
+	       108 dB per octave.
+
+	   20th
+	       120 dB per octave.
+
+	   Default is 4th.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 1. Default value
+	   is 1.
+
+       gains
+	   Set output gain for each band. Default value is 1 for all bands.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+	   Default value is "auto".
+
+       Examples
+
+       o   Split input audio stream into two bands (low and high) with split
+	   frequency of 1500 Hz, each band will be in separate stream:
+
+		   ffmpeg -i in.flac -filter_complex 'acrossover=split=1500[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
+
+       o   Same as above, but with higher filter order:
+
+		   ffmpeg -i in.flac -filter_complex 'acrossover=split=1500:order=8th[LOW][HIGH]' -map '[LOW]' low.wav -map '[HIGH]' high.wav
+
+       o   Same as above, but also with additional middle band (frequencies
+	   between 1500 and 8000):
+
+		   ffmpeg -i in.flac -filter_complex 'acrossover=split=1500 8000:order=8th[LOW][MID][HIGH]' -map '[LOW]' low.wav -map '[MID]' mid.wav -map '[HIGH]' high.wav
+
+   acrusher
+       Reduce audio bit resolution.
+
+       This filter is bit crusher with enhanced functionality. A bit crusher
+       is used to audibly reduce number of bits an audio signal is sampled
+       with. This doesn't change the bit depth at all, it just produces the
+       effect. Material reduced in bit depth sounds more harsh and "digital".
+       This filter is able to even round to continuous values instead of
+       discrete bit depths.  Additionally it has a D/C offset which results in
+       different crushing of the lower and the upper half of the signal.  An
+       Anti-Aliasing setting is able to produce "softer" crushing sounds.
+
+       Another feature of this filter is the logarithmic mode.	This setting
+       switches from linear distances between bits to logarithmic ones.  The
+       result is a much more "natural" sounding crusher which doesn't gate low
+       signals for example. The human ear has a logarithmic perception, so
+       this kind of crushing is much more pleasant.  Logarithmic crushing is
+       also able to get anti-aliased.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set level in.
+
+       level_out
+	   Set level out.
+
+       bits
+	   Set bit reduction.
+
+       mix Set mixing amount.
+
+       mode
+	   Can be linear: "lin" or logarithmic: "log".
+
+       dc  Set DC.
+
+       aa  Set anti-aliasing.
+
+       samples
+	   Set sample reduction.
+
+       lfo Enable LFO. By default disabled.
+
+       lforange
+	   Set LFO range.
+
+       lforate
+	   Set LFO rate.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   acue
+       Delay audio filtering until a given wallclock timestamp. See the cue
+       filter.
+
+   adeclick
+       Remove impulsive noise from input audio.
+
+       Samples detected as impulsive noise are replaced by interpolated
+       samples using autoregressive modelling.
+
+       window, w
+	   Set window size, in milliseconds. Allowed range is from 10 to 100.
+	   Default value is 55 milliseconds.  This sets size of window which
+	   will be processed at once.
+
+       overlap, o
+	   Set window overlap, in percentage of window size. Allowed range is
+	   from 50 to 95. Default value is 75 percent.	Setting this to a very
+	   high value increases impulsive noise removal but makes whole
+	   process much slower.
+
+       arorder, a
+	   Set autoregression order, in percentage of window size. Allowed
+	   range is from 0 to 25. Default value is 2 percent. This option also
+	   controls quality of interpolated samples using neighbour good
+	   samples.
+
+       threshold, t
+	   Set threshold value. Allowed range is from 1 to 100.  Default value
+	   is 2.  This controls the strength of impulsive noise which is going
+	   to be removed.  The lower value, the more samples will be detected
+	   as impulsive noise.
+
+       burst, b
+	   Set burst fusion, in percentage of window size. Allowed range is 0
+	   to 10. Default value is 2.  If any two samples detected as noise
+	   are spaced less than this value then any sample between those two
+	   samples will be also detected as noise.
+
+       method, m
+	   Set overlap method.
+
+	   It accepts the following values:
+
+	   add, a
+	       Select overlap-add method. Even not interpolated samples are
+	       slightly changed with this method.
+
+	   save, s
+	       Select overlap-save method. Not interpolated samples remain
+	       unchanged.
+
+	   Default value is "a".
+
+   adeclip
+       Remove clipped samples from input audio.
+
+       Samples detected as clipped are replaced by interpolated samples using
+       autoregressive modelling.
+
+       window, w
+	   Set window size, in milliseconds. Allowed range is from 10 to 100.
+	   Default value is 55 milliseconds.  This sets size of window which
+	   will be processed at once.
+
+       overlap, o
+	   Set window overlap, in percentage of window size. Allowed range is
+	   from 50 to 95. Default value is 75 percent.
+
+       arorder, a
+	   Set autoregression order, in percentage of window size. Allowed
+	   range is from 0 to 25. Default value is 8 percent. This option also
+	   controls quality of interpolated samples using neighbour good
+	   samples.
+
+       threshold, t
+	   Set threshold value. Allowed range is from 1 to 100.  Default value
+	   is 10. Higher values make clip detection less aggressive.
+
+       hsize, n
+	   Set size of histogram used to detect clips. Allowed range is from
+	   100 to 9999.  Default value is 1000. Higher values make clip
+	   detection less aggressive.
+
+       method, m
+	   Set overlap method.
+
+	   It accepts the following values:
+
+	   add, a
+	       Select overlap-add method. Even not interpolated samples are
+	       slightly changed with this method.
+
+	   save, s
+	       Select overlap-save method. Not interpolated samples remain
+	       unchanged.
+
+	   Default value is "a".
+
+   adecorrelate
+       Apply decorrelation to input audio stream.
+
+       The filter accepts the following options:
+
+       stages
+	   Set decorrelation stages of filtering. Allowed range is from 1 to
+	   16. Default value is 6.
+
+       seed
+	   Set random seed used for setting delay in samples across channels.
+
+   adelay
+       Delay one or more audio channels.
+
+       Samples in delayed channel are filled with silence.
+
+       The filter accepts the following option:
+
+       delays
+	   Set list of delays in milliseconds for each channel separated by
+	   '|'.  Unused delays will be silently ignored. If number of given
+	   delays is smaller than number of channels all remaining channels
+	   will not be delayed.  If you want to delay exact number of samples,
+	   append 'S' to number.  If you want instead to delay in seconds,
+	   append 's' to number.
+
+       all Use last set delay for all remaining channels. By default is
+	   disabled.  This option if enabled changes how option "delays" is
+	   interpreted.
+
+       Examples
+
+       o   Delay first channel by 1.5 seconds, the third channel by 0.5
+	   seconds and leave the second channel (and any other channels that
+	   may be present) unchanged.
+
+		   adelay=1500|0|500
+
+       o   Delay second channel by 500 samples, the third channel by 700
+	   samples and leave the first channel (and any other channels that
+	   may be present) unchanged.
+
+		   adelay=0|500S|700S
+
+       o   Delay all channels by same number of samples:
+
+		   adelay=delays=64S:all=1
+
+   adenorm
+       Remedy denormals in audio by adding extremely low-level noise.
+
+       This filter shall be placed before any filter that can produce
+       denormals.
+
+       A description of the accepted parameters follows.
+
+       level
+	   Set level of added noise in dB. Default is "-351".  Allowed range
+	   is from -451 to -90.
+
+       type
+	   Set type of added noise.
+
+	   dc  Add DC signal.
+
+	   ac  Add AC signal.
+
+	   square
+	       Add square signal.
+
+	   pulse
+	       Add pulse signal.
+
+	   Default is "dc".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aderivative, aintegral
+       Compute derivative/integral of audio stream.
+
+       Applying both filters one after another produces original audio.
+
+   adrc
+       Apply spectral dynamic range controller filter to input audio stream.
+
+       A description of the accepted options follows.
+
+       transfer
+	   Set the transfer expression.
+
+	   The expression can contain the following constants:
+
+	   ch  current channel number
+
+	   sn  current sample number
+
+	   nb_channels
+	       number of channels
+
+	   t   timestamp expressed in seconds
+
+	   sr  sample rate
+
+	   p   current frequency power value, in dB
+
+	   f   current frequency in Hz
+
+	   Default value is "p".
+
+       attack
+	   Set the attack in milliseconds. Default is 50 milliseconds.
+	   Allowed range is from 1 to 1000 milliseconds.
+
+       release
+	   Set the release in milliseconds. Default is 100 milliseconds.
+	   Allowed range is from 5 to 2000 milliseconds.
+
+       channels
+	   Set which channels to filter, by default "all" channels in audio
+	   stream are filtered.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Apply spectral compression to all frequencies with threshold of -50
+	   dB and 1:6 ratio:
+
+		   adrc=transfer='if(gt(p,-50),-50+(p-(-50))/6,p)':attack=50:release=100
+
+       o   Similar to above but with 1:2 ratio and filtering only front center
+	   channel:
+
+		   adrc=transfer='if(gt(p,-50),-50+(p-(-50))/2,p)':attack=50:release=100:channels=FC
+
+       o   Apply spectral noise gate to all frequencies with threshold of -85
+	   dB and with short attack time and short release time:
+
+		   adrc=transfer='if(lte(p,-85),p-800,p)':attack=1:release=5
+
+       o   Apply spectral expansion to all frequencies with threshold of -10
+	   dB and 1:2 ratio:
+
+		   adrc=transfer='if(lt(p,-10),-10+(p-(-10))*2,p)':attack=50:release=100
+
+       o   Apply limiter to max -60 dB to all frequencies, with attack of 2 ms
+	   and release of 10 ms:
+
+		   adrc=transfer='min(p,-60)':attack=2:release=10
+
+   adynamicequalizer
+       Apply dynamic equalization to input audio stream.
+
+       A description of the accepted options follows.
+
+       threshold
+	   Set the detection threshold used to trigger equalization.
+	   Threshold detection is using detection filter.  Default value is 0.
+	   Allowed range is from 0 to 100.
+
+       dfrequency
+	   Set the detection frequency in Hz used for detection filter used to
+	   trigger equalization.  Default value is 1000 Hz. Allowed range is
+	   between 2 and 1000000 Hz.
+
+       dqfactor
+	   Set the detection resonance factor for detection filter used to
+	   trigger equalization.  Default value is 1. Allowed range is from
+	   0.001 to 1000.
+
+       tfrequency
+	   Set the target frequency of equalization filter.  Default value is
+	   1000 Hz. Allowed range is between 2 and 1000000 Hz.
+
+       tqfactor
+	   Set the target resonance factor for target equalization filter.
+	   Default value is 1. Allowed range is from 0.001 to 1000.
+
+       attack
+	   Set the amount of milliseconds the signal from detection has to
+	   rise above the detection threshold before equalization starts.
+	   Default is 20. Allowed range is between 1 and 2000.
+
+       release
+	   Set the amount of milliseconds the signal from detection has to
+	   fall below the detection threshold before equalization ends.
+	   Default is 200. Allowed range is between 1 and 2000.
+
+       ratio
+	   Set the ratio by which the equalization gain is raised.  Default is
+	   1. Allowed range is between 0 and 30.
+
+       makeup
+	   Set the makeup offset by which the equalization gain is raised.
+	   Default is 0. Allowed range is between 0 and 100.
+
+       range
+	   Set the max allowed cut/boost amount. Default is 50.  Allowed range
+	   is from 1 to 200.
+
+       mode
+	   Set the mode of filter operation, can be one of the following:
+
+	   listen
+	       Output only isolated detection signal.
+
+	   cutbelow
+	       Cut frequencies below detection threshold.
+
+	   cutabove
+	       Cut frequencies above detection threshold.
+
+	   boostbelow
+	       Boost frequencies below detection threshold.
+
+	   boostabove
+	       Boost frequencies above detection threshold.
+
+	   Default mode is cutbelow.
+
+       dftype
+	   Set the type of detection filter, can be one of the following:
+
+	   bandpass
+	   lowpass
+	   highpass
+	   peak
+
+	   Default type is bandpass.
+
+       tftype
+	   Set the type of target filter, can be one of the following:
+
+	   bell
+	   lowshelf
+	   highshelf
+
+	   Default type is bell.
+
+       auto
+	   Automatically gather threshold from detection filter. By default is
+	   disabled.  This option is useful to detect threshold in certain
+	   time frame of input audio stream, in such case option value is
+	   changed at runtime.
+
+	   Available values are:
+
+	   disabled
+	       Disable using automatically gathered threshold value.
+
+	   off Stop picking threshold value.
+
+	   on  Start picking threshold value.
+
+	   adaptive
+	       Adaptively pick threshold value, by calculating sliding window
+	       entropy.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   adynamicsmooth
+       Apply dynamic smoothing to input audio stream.
+
+       A description of the accepted options follows.
+
+       sensitivity
+	   Set an amount of sensitivity to frequency fluctations. Default is
+	   2.  Allowed range is from 0 to 1e+06.
+
+       basefreq
+	   Set a base frequency for smoothing. Default value is 22050.
+	   Allowed range is from 2 to 1e+06.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aecho
+       Apply echoing to the input audio.
+
+       Echoes are reflected sound and can occur naturally amongst mountains
+       (and sometimes large buildings) when talking or shouting; digital echo
+       effects emulate this behaviour and are often used to help fill out the
+       sound of a single instrument or vocal. The time difference between the
+       original signal and the reflection is the "delay", and the loudness of
+       the reflected signal is the "decay".  Multiple echoes can have
+       different delays and decays.
+
+       A description of the accepted parameters follows.
+
+       in_gain
+	   Set input gain of reflected signal. Default is 0.6.
+
+       out_gain
+	   Set output gain of reflected signal. Default is 0.3.
+
+       delays
+	   Set list of time intervals in milliseconds between original signal
+	   and reflections separated by '|'. Allowed range for each "delay" is
+	   "(0 - 90000.0]".  Default is 1000.
+
+       decays
+	   Set list of loudness of reflected signals separated by '|'.
+	   Allowed range for each "decay" is "(0 - 1.0]".  Default is 0.5.
+
+       Examples
+
+       o   Make it sound as if there are twice as many instruments as are
+	   actually playing:
+
+		   aecho=0.8:0.88:60:0.4
+
+       o   If delay is very short, then it sounds like a (metallic) robot
+	   playing music:
+
+		   aecho=0.8:0.88:6:0.4
+
+       o   A longer delay will sound like an open air concert in the
+	   mountains:
+
+		   aecho=0.8:0.9:1000:0.3
+
+       o   Same as above but with one more mountain:
+
+		   aecho=0.8:0.9:1000|1800:0.3|0.25
+
+   aemphasis
+       Audio emphasis filter creates or restores material directly taken from
+       LPs or emphased CDs with different filter curves. E.g. to store music
+       on vinyl the signal has to be altered by a filter first to even out the
+       disadvantages of this recording medium.	Once the material is played
+       back the inverse filter has to be applied to restore the distortion of
+       the frequency response.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain.
+
+       level_out
+	   Set output gain.
+
+       mode
+	   Set filter mode. For restoring material use "reproduction" mode,
+	   otherwise use "production" mode. Default is "reproduction" mode.
+
+       type
+	   Set filter type. Selects medium. Can be one of the following:
+
+	   col select Columbia.
+
+	   emi select EMI.
+
+	   bsi select BSI (78RPM).
+
+	   riaa
+	       select RIAA.
+
+	   cd  select Compact Disc (CD).
+
+	   50fm
+	       select 50Xs (FM).
+
+	   75fm
+	       select 75Xs (FM).
+
+	   50kf
+	       select 50Xs (FM-KF).
+
+	   75kf
+	       select 75Xs (FM-KF).
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aeval
+       Modify an audio signal according to the specified expressions.
+
+       This filter accepts one or more expressions (one for each channel),
+       which are evaluated and used to modify a corresponding audio signal.
+
+       It accepts the following parameters:
+
+       exprs
+	   Set the '|'-separated expressions list for each separate channel.
+	   If the number of input channels is greater than the number of
+	   expressions, the last specified expression is used for the
+	   remaining output channels.
+
+       channel_layout, c
+	   Set output channel layout. If not specified, the channel layout is
+	   specified by the number of expressions. If set to same, it will use
+	   by default the same input channel layout.
+
+       Each expression in exprs can contain the following constants and
+       functions:
+
+       ch  channel number of the current expression
+
+       n   number of the evaluated sample, starting from 0
+
+       s   sample rate
+
+       t   time of the evaluated sample expressed in seconds
+
+       nb_in_channels
+       nb_out_channels
+	   input and output number of channels
+
+       val(CH)
+	   the value of input channel with number CH
+
+       Note: this filter is slow. For faster processing you should use a
+       dedicated filter.
+
+       Examples
+
+       o   Half volume:
+
+		   aeval=val(ch)/2:c=same
+
+       o   Invert phase of the second channel:
+
+		   aeval=val(0)|-val(1)
+
+   aexciter
+       An exciter is used to produce high sound that is not present in the
+       original signal. This is done by creating harmonic distortions of the
+       signal which are restricted in range and added to the original signal.
+       An Exciter raises the upper end of an audio signal without simply
+       raising the higher frequencies like an equalizer would do to create a
+       more "crisp" or "brilliant" sound.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level prior processing of signal.	Allowed range is from
+	   0 to 64.  Default value is 1.
+
+       level_out
+	   Set output level after processing of signal.  Allowed range is from
+	   0 to 64.  Default value is 1.
+
+       amount
+	   Set the amount of harmonics added to original signal.  Allowed
+	   range is from 0 to 64.  Default value is 1.
+
+       drive
+	   Set the amount of newly created harmonics.  Allowed range is from
+	   0.1 to 10.  Default value is 8.5.
+
+       blend
+	   Set the octave of newly created harmonics.  Allowed range is from
+	   -10 to 10.  Default value is 0.
+
+       freq
+	   Set the lower frequency limit of producing harmonics in Hz.
+	   Allowed range is from 2000 to 12000 Hz.  Default is 7500 Hz.
+
+       ceil
+	   Set the upper frequency limit of producing harmonics.  Allowed
+	   range is from 9999 to 20000 Hz.  If value is lower than 10000 Hz no
+	   limit is applied.
+
+       listen
+	   Mute the original signal and output only added harmonics.  By
+	   default is disabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   afade
+       Apply fade-in/out effect to input audio.
+
+       A description of the accepted parameters follows.
+
+       type, t
+	   Specify the effect type, can be either "in" for fade-in, or "out"
+	   for a fade-out effect. Default is "in".
+
+       start_sample, ss
+	   Specify the number of the start sample for starting to apply the
+	   fade effect. Default is 0.
+
+       nb_samples, ns
+	   Specify the number of samples for which the fade effect has to
+	   last. At the end of the fade-in effect the output audio will have
+	   the same volume as the input audio, at the end of the fade-out
+	   transition the output audio will be silence. Default is 44100.
+
+       start_time, st
+	   Specify the start time of the fade effect. Default is 0.  The value
+	   must be specified as a time duration; see the Time duration section
+	   in the ffmpeg-utils(1) manual for the accepted syntax.  If set this
+	   option is used instead of start_sample.
+
+       duration, d
+	   Specify the duration of the fade effect. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.  At
+	   the end of the fade-in effect the output audio will have the same
+	   volume as the input audio, at the end of the fade-out transition
+	   the output audio will be silence.  By default the duration is
+	   determined by nb_samples.  If set this option is used instead of
+	   nb_samples.
+
+       curve
+	   Set curve for fade transition.
+
+	   It accepts the following values:
+
+	   tri select triangular, linear slope (default)
+
+	   qsin
+	       select quarter of sine wave
+
+	   hsin
+	       select half of sine wave
+
+	   esin
+	       select exponential sine wave
+
+	   log select logarithmic
+
+	   ipar
+	       select inverted parabola
+
+	   qua select quadratic
+
+	   cub select cubic
+
+	   squ select square root
+
+	   cbr select cubic root
+
+	   par select parabola
+
+	   exp select exponential
+
+	   iqsin
+	       select inverted quarter of sine wave
+
+	   ihsin
+	       select inverted half of sine wave
+
+	   dese
+	       select double-exponential seat
+
+	   desi
+	       select double-exponential sigmoid
+
+	   losi
+	       select logistic sigmoid
+
+	   sinc
+	       select sine cardinal function
+
+	   isinc
+	       select inverted sine cardinal function
+
+	   quat
+	       select quartic
+
+	   quatr
+	       select quartic root
+
+	   qsin2
+	       select squared quarter of sine wave
+
+	   hsin2
+	       select squared half of sine wave
+
+	   nofade
+	       no fade applied
+
+       silence
+	   Set the initial gain for fade-in or final gain for fade-out.
+	   Default value is 0.0.
+
+       unity
+	   Set the initial gain for fade-out or final gain for fade-in.
+	   Default value is 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Fade in first 15 seconds of audio:
+
+		   afade=t=in:ss=0:d=15
+
+       o   Fade out last 25 seconds of a 900 seconds audio:
+
+		   afade=t=out:st=875:d=25
+
+   afftdn
+       Denoise audio samples with FFT.
+
+       A description of the accepted parameters follows.
+
+       noise_reduction, nr
+	   Set the noise reduction in dB, allowed range is 0.01 to 97.
+	   Default value is 12 dB.
+
+       noise_floor, nf
+	   Set the noise floor in dB, allowed range is -80 to -20.  Default
+	   value is -50 dB.
+
+       noise_type, nt
+	   Set the noise type.
+
+	   It accepts the following values:
+
+	   white, w
+	       Select white noise.
+
+	   vinyl, v
+	       Select vinyl noise.
+
+	   shellac, s
+	       Select shellac noise.
+
+	   custom, c
+	       Select custom noise, defined in "bn" option.
+
+	       Default value is white noise.
+
+       band_noise, bn
+	   Set custom band noise profile for every one of 15 bands.  Bands are
+	   separated by ' ' or '|'.
+
+       residual_floor, rf
+	   Set the residual floor in dB, allowed range is -80 to -20.  Default
+	   value is -38 dB.
+
+       track_noise, tn
+	   Enable noise floor tracking. By default is disabled.  With this
+	   enabled, noise floor is automatically adjusted.
+
+       track_residual, tr
+	   Enable residual tracking. By default is disabled.
+
+       output_mode, om
+	   Set the output mode.
+
+	   It accepts the following values:
+
+	   input, i
+	       Pass input unchanged.
+
+	   output, o
+	       Pass noise filtered out.
+
+	   noise, n
+	       Pass only noise.
+
+	       Default value is output.
+
+       adaptivity, ad
+	   Set the adaptivity factor, used how fast to adapt gains adjustments
+	   per each frequency bin. Value 0 enables instant adaptation, while
+	   higher values react much slower.  Allowed range is from 0 to 1.
+	   Default value is 0.5.
+
+       floor_offset, fo
+	   Set the noise floor offset factor. This option is used to adjust
+	   offset applied to measured noise floor. It is only effective when
+	   noise floor tracking is enabled.  Allowed range is from -2.0 to
+	   2.0. Default value is 1.0.
+
+       noise_link, nl
+	   Set the noise link used for multichannel audio.
+
+	   It accepts the following values:
+
+	   none
+	       Use unchanged channel's noise floor.
+
+	   min Use measured min noise floor of all channels.
+
+	   max Use measured max noise floor of all channels.
+
+	   average
+	       Use measured average noise floor of all channels.
+
+	       Default value is min.
+
+       band_multiplier, bm
+	   Set the band multiplier factor, used how much to spread bands
+	   across frequency bins.  Allowed range is from 0.2 to 5. Default
+	   value is 1.25.
+
+       sample_noise, sn
+	   Toggle capturing and measurement of noise profile from input audio.
+
+	   It accepts the following values:
+
+	   start, begin
+	       Start sample noise capture.
+
+	   stop, end
+	       Stop sample noise capture and measure new noise band profile.
+
+	       Default value is "none".
+
+       gain_smooth, gs
+	   Set gain smooth spatial radius, used to smooth gains applied to
+	   each frequency bin.	Useful to reduce random music noise artefacts.
+	   Higher values increases smoothing of gains.	Allowed range is from
+	   0 to 50.  Default value is 0.
+
+       Commands
+
+       This filter supports the some above mentioned options as commands.
+
+       Examples
+
+       o   Reduce white noise by 10dB, and use previously measured noise floor
+	   of -40dB:
+
+		   afftdn=nr=10:nf=-40
+
+       o   Reduce white noise by 10dB, also set initial noise floor to -80dB
+	   and enable automatic tracking of noise floor so noise floor will
+	   gradually change during processing:
+
+		   afftdn=nr=10:nf=-80:tn=1
+
+       o   Reduce noise by 20dB, using noise floor of -40dB and using commands
+	   to take noise profile of first 0.4 seconds of input audio:
+
+		   asendcmd=0.0 afftdn sn start,asendcmd=0.4 afftdn sn stop,afftdn=nr=20:nf=-40
+
+   afftfilt
+       Apply arbitrary expressions to samples in frequency domain.
+
+       real
+	   Set frequency domain real expression for each separate channel
+	   separated by '|'. Default is "re".  If the number of input channels
+	   is greater than the number of expressions, the last specified
+	   expression is used for the remaining output channels.
+
+       imag
+	   Set frequency domain imaginary expression for each separate channel
+	   separated by '|'. Default is "im".
+
+	   Each expression in real and imag can contain the following
+	   constants and functions:
+
+	   sr  sample rate
+
+	   b   current frequency bin number
+
+	   nb  number of available bins
+
+	   ch  channel number of the current expression
+
+	   chs number of channels
+
+	   pts current frame pts
+
+	   re  current real part of frequency bin of current channel
+
+	   im  current imaginary part of frequency bin of current channel
+
+	   real(b, ch)
+	       Return the value of real part of frequency bin at location
+	       (bin,channel)
+
+	   imag(b, ch)
+	       Return the value of imaginary part of frequency bin at location
+	       (bin,channel)
+
+       win_size
+	   Set window size. Allowed range is from 16 to 131072.  Default is
+	   4096
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann, hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hann".
+
+       overlap
+	   Set window overlap. If set to 1, the recommended overlap for
+	   selected window function will be picked. Default is 0.75.
+
+       Examples
+
+       o   Leave almost only low frequencies in audio:
+
+		   afftfilt="'real=re * (1-clip((b/nb)*b,0,1))':imag='im * (1-clip((b/nb)*b,0,1))'"
+
+       o   Apply robotize effect:
+
+		   afftfilt="real='hypot(re,im)*sin(0)':imag='hypot(re,im)*cos(0)':win_size=512:overlap=0.75"
+
+       o   Apply whisper effect:
+
+		   afftfilt="real='hypot(re,im)*cos((random(0)*2-1)*2*3.14)':imag='hypot(re,im)*sin((random(1)*2-1)*2*3.14)':win_size=128:overlap=0.8"
+
+       o   Apply phase shift:
+
+		   afftfilt="real=re*cos(1)-im*sin(1):imag=re*sin(1)+im*cos(1)"
+
+   afir
+       Apply an arbitrary Finite Impulse Response filter.
+
+       This filter is designed for applying long FIR filters, up to 60 seconds
+       long.
+
+       It can be used as component for digital crossover filters, room
+       equalization, cross talk cancellation, wavefield synthesis,
+       auralization, ambiophonics, ambisonics and spatialization.
+
+       This filter uses the streams higher than first one as FIR coefficients.
+       If the non-first stream holds a single channel, it will be used for all
+       input channels in the first stream, otherwise the number of channels in
+       the non-first stream must be same as the number of channels in the
+       first stream.
+
+       It accepts the following parameters:
+
+       dry Set dry gain. This sets input gain.
+
+       wet Set wet gain. This sets final output gain.
+
+       length
+	   Set Impulse Response filter length. Default is 1, which means whole
+	   IR is processed.
+
+       gtype
+	   This option is deprecated, and does nothing.
+
+       irnorm
+	   Set norm to be applied to IR coefficients before filtering.
+	   Allowed range is from -1 to 2.  IR coefficients are normalized with
+	   calculated vector norm set by this option.  For negative values, no
+	   norm is calculated, and IR coefficients are not modified at all.
+	   Default is 1.
+
+       irlink
+	   For multichannel IR if this option is set to true, all IR channels
+	   will be normalized with maximal measured gain of all IR channels
+	   coefficients as set by "irnorm" option.  When disabled, all IR
+	   coefficients in each IR channel will be normalized independently.
+	   Default is true.
+
+       irgain
+	   Set gain to be applied to IR coefficients before filtering.
+	   Allowed range is 0 to 1. This gain is applied after any gain
+	   applied with irnorm option.
+
+       irfmt
+	   Set format of IR stream. Can be "mono" or "input".  Default is
+	   "input".
+
+       maxir
+	   Set max allowed Impulse Response filter duration in seconds.
+	   Default is 30 seconds.  Allowed range is 0.1 to 60 seconds.
+
+       response
+	   This option is deprecated, and does nothing.
+
+       channel
+	   This option is deprecated, and does nothing.
+
+       size
+	   This option is deprecated, and does nothing.
+
+       rate
+	   This option is deprecated, and does nothing.
+
+       minp
+	   Set minimal partition size used for convolution. Default is 8192.
+	   Allowed range is from 1 to 65536.  Lower values decreases latency
+	   at cost of higher CPU usage.
+
+       maxp
+	   Set maximal partition size used for convolution. Default is 8192.
+	   Allowed range is from 8 to 65536.  Lower values may increase CPU
+	   usage.
+
+       nbirs
+	   Set number of input impulse responses streams which will be
+	   switchable at runtime.  Allowed range is from 1 to 32. Default is
+	   1.
+
+       ir  Set IR stream which will be used for convolution, starting from 0,
+	   should always be lower than supplied value by "nbirs" option.
+	   Default is 0.  This option can be changed at runtime via commands.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+	   Default value is auto.
+
+       irload
+	   Set when to load IR stream. Can be "init" or "access".  First one
+	   load and prepares all IRs on initialization, second one once on
+	   first access of specific IR.  Default is "init".
+
+       Examples
+
+       o   Apply reverb to stream using mono IR file as second input, complete
+	   command using ffmpeg:
+
+		   ffmpeg -i input.wav -i middle_tunnel_1way_mono.wav -lavfi afir output.wav
+
+       o   Apply true stereo processing given input stereo stream, and two
+	   stereo impulse responses for left and right channel, the impulse
+	   response files are files with names l_ir.wav and r_ir.wav, and
+	   setting irnorm option value:
+
+		   "pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irnorm=1.2,pan=stereo|FL<c0+c2|FR<c1+c3"
+
+       o   Similar to above example, but with "irgain" explicitly set to
+	   estimated value and with "irnorm" disabled:
+
+		   "pan=4C|c0=FL|c1=FL|c2=FR|c3=FR[a];amovie=l_ir.wav[LIR];amovie=r_ir.wav[RIR];[LIR][RIR]amerge[ir];[a][ir]afir=irfmt=input:irgain=-5dB:irnom=-1,pan=stereo|FL<c0+c2|FR<c1+c3"
+
+   aformat
+       Set output format constraints for the input audio. The framework will
+       negotiate the most appropriate format to minimize conversions.
+
+       It accepts the following parameters:
+
+       sample_fmts, f
+	   A '|'-separated list of requested sample formats.
+
+       sample_rates, r
+	   A '|'-separated list of requested sample rates.
+
+       channel_layouts, cl
+	   A '|'-separated list of requested channel layouts.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       If a parameter is omitted, all values are allowed.
+
+       Force the output to either unsigned 8-bit or signed 16-bit stereo
+
+	       aformat=sample_fmts=u8|s16:channel_layouts=stereo
+
+   afreqshift
+       Apply frequency shift to input audio samples.
+
+       The filter accepts the following options:
+
+       shift
+	   Specify frequency shift. Allowed range is -INT_MAX to INT_MAX.
+	   Default value is 0.0.
+
+       level
+	   Set output gain applied to final output. Allowed range is from 0.0
+	   to 1.0.  Default value is 1.0.
+
+       order
+	   Set filter order used for filtering. Allowed range is from 1 to 16.
+	   Default value is 8.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   afwtdn
+       Reduce broadband noise from input samples using Wavelets.
+
+       A description of the accepted options follows.
+
+       sigma
+	   Set the noise sigma, allowed range is from 0 to 1.  Default value
+	   is 0.  This option controls strength of denoising applied to input
+	   samples.  Most useful way to set this option is via decibels, eg.
+	   -45dB.
+
+       levels
+	   Set the number of wavelet levels of decomposition.  Allowed range
+	   is from 1 to 12.  Default value is 10.  Setting this too low make
+	   denoising performance very poor.
+
+       wavet
+	   Set wavelet type for decomposition of input frame.  They are sorted
+	   by number of coefficients, from lowest to highest.  More
+	   coefficients means worse filtering speed, but overall better
+	   quality.  Available wavelets are:
+
+	   sym2
+	   sym4
+	   rbior68
+	   deb10
+	   sym10
+	   coif5
+	   bl3
+       percent
+	   Set percent of full denoising. Allowed range is from 0 to 100
+	   percent.  Default value is 85 percent or partial denoising.
+
+       profile
+	   If enabled, first input frame will be used as noise profile.  If
+	   first frame samples contain non-noise performance will be very
+	   poor.
+
+       adaptive
+	   If enabled, input frames are analyzed for presence of noise.  If
+	   noise is detected with high possibility then input frame profile
+	   will be used for processing following frames, until new noise frame
+	   is detected.
+
+       samples
+	   Set size of single frame in number of samples. Allowed range is
+	   from 512 to 65536. Default frame size is 8192 samples.
+
+       softness
+	   Set softness applied inside thresholding function. Allowed range is
+	   from 0 to 10. Default softness is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   agate
+       A gate is mainly used to reduce lower parts of a signal. This kind of
+       signal processing reduces disturbing noise between useful signals.
+
+       Gating is done by detecting the volume below a chosen level threshold
+       and dividing it by the factor set with ratio. The bottom of the noise
+       floor is set via range. Because an exact manipulation of the signal
+       would cause distortion of the waveform the reduction can be levelled
+       over time. This is done by setting attack and release.
+
+       attack determines how long the signal has to fall below the threshold
+       before any reduction will occur and release sets the time the signal
+       has to rise above the threshold to reduce the reduction again.  Shorter
+       signals than the chosen attack time will be left untouched.
+
+       level_in
+	   Set input level before filtering.  Default is 1. Allowed range is
+	   from 0.015625 to 64.
+
+       mode
+	   Set the mode of operation. Can be "upward" or "downward".  Default
+	   is "downward". If set to "upward" mode, higher parts of signal will
+	   be amplified, expanding dynamic range in upward direction.
+	   Otherwise, in case of "downward" lower parts of signal will be
+	   reduced.
+
+       range
+	   Set the level of gain reduction when the signal is below the
+	   threshold.  Default is 0.06125. Allowed range is from 0 to 1.
+	   Setting this to 0 disables reduction and then filter behaves like
+	   expander.
+
+       threshold
+	   If a signal rises above this level the gain reduction is released.
+	   Default is 0.125. Allowed range is from 0 to 1.
+
+       ratio
+	   Set a ratio by which the signal is reduced.	Default is 2. Allowed
+	   range is from 1 to 9000.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction stops.  Default is 20 milliseconds. Allowed
+	   range is from 0.01 to 9000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before the reduction is increased again. Default is 250
+	   milliseconds.  Allowed range is from 0.01 to 9000.
+
+       makeup
+	   Set amount of amplification of signal after processing.  Default is
+	   1. Allowed range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.828427125. Allowed range is from 1 to 8.
+
+       detection
+	   Choose if exact signal should be taken for detection or an RMS like
+	   one.  Default is "rms". Can be "peak" or "rms".
+
+       link
+	   Choose if the average level between all channels or the louder
+	   channel affects the reduction.  Default is "average". Can be
+	   "average" or "maximum".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aiir
+       Apply an arbitrary Infinite Impulse Response filter.
+
+       It accepts the following parameters:
+
+       zeros, z
+	   Set B/numerator/zeros/reflection coefficients.
+
+       poles, p
+	   Set A/denominator/poles/ladder coefficients.
+
+       gains, k
+	   Set channels gains.
+
+       dry_gain
+	   Set input gain.
+
+       wet_gain
+	   Set output gain.
+
+       format, f
+	   Set coefficients format.
+
+	   ll  lattice-ladder function
+
+	   sf  analog transfer function
+
+	   tf  digital transfer function
+
+	   zp  Z-plane zeros/poles, cartesian (default)
+
+	   pr  Z-plane zeros/poles, polar radians
+
+	   pd  Z-plane zeros/poles, polar degrees
+
+	   sp  S-plane zeros/poles
+
+       process, r
+	   Set type of processing.
+
+	   d   direct processing
+
+	   s   serial processing
+
+	   p   parallel processing
+
+       precision, e
+	   Set filtering precision.
+
+	   dbl double-precision floating-point (default)
+
+	   flt single-precision floating-point
+
+	   i32 32-bit integers
+
+	   i16 16-bit integers
+
+       normalize, n
+	   Normalize filter coefficients, by default is enabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       mix How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       response
+	   Show IR frequency response, magnitude(magenta), phase(green) and
+	   group delay(yellow) in additional video stream.  By default it is
+	   disabled.
+
+       channel
+	   Set for which IR channel to display frequency response. By default
+	   is first channel displayed. This option is used only when response
+	   is enabled.
+
+       size
+	   Set video stream size. This option is used only when response is
+	   enabled.
+
+       Coefficients in "tf" and "sf" format are separated by spaces and are in
+       ascending order.
+
+       Coefficients in "zp" format are separated by spaces and order of
+       coefficients doesn't matter. Coefficients in "zp" format are complex
+       numbers with i imaginary unit.
+
+       Different coefficients and gains can be provided for every channel, in
+       such case use '|' to separate coefficients or gains. Last provided
+       coefficients will be used for all remaining channels.
+
+       Examples
+
+       o   Apply 2 pole elliptic notch at around 5000Hz for 48000 Hz sample
+	   rate:
+
+		   aiir=k=1:z=7.957584807809675810E-1 -2.575128568908332300 3.674839853930788710 -2.57512875289799137 7.957586296317130880E-1:p=1 -2.86950072432325953 3.63022088054647218 -2.28075678147272232 6.361362326477423500E-1:f=tf:r=d
+
+       o   Same as above but in "zp" format:
+
+		   aiir=k=0.79575848078096756:z=0.80918701+0.58773007i 0.80918701-0.58773007i 0.80884700+0.58784055i 0.80884700-0.58784055i:p=0.63892345+0.59951235i 0.63892345-0.59951235i 0.79582691+0.44198673i 0.79582691-0.44198673i:f=zp:r=s
+
+       o   Apply 3-rd order analog normalized Butterworth low-pass filter,
+	   using analog transfer function format:
+
+		   aiir=z=1.3057 0 0 0:p=1.3057 2.3892 2.1860 1:f=sf:r=d
+
+   alimiter
+       The limiter prevents an input signal from rising over a desired
+       threshold.  This limiter uses lookahead technology to prevent your
+       signal from distorting.	It means that there is a small delay after the
+       signal is processed. Keep in mind that the delay it produces is the
+       attack time you set.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. Default is 1.
+
+       level_out
+	   Set output gain. Default is 1.
+
+       limit
+	   Don't let signals above this level pass the limiter. Default is 1.
+
+       attack
+	   The limiter will reach its attenuation level in this amount of time
+	   in milliseconds. Default is 5 milliseconds.
+
+       release
+	   Come back from limiting to attenuation 1.0 in this amount of
+	   milliseconds.  Default is 50 milliseconds.
+
+       asc When gain reduction is always needed ASC takes care of releasing to
+	   an average reduction level rather than reaching a reduction of 0 in
+	   the release time.
+
+       asc_level
+	   Select how much the release time is affected by ASC, 0 means nearly
+	   no changes in release time while 1 produces higher release times.
+
+       level
+	   Auto level output signal. Default is enabled.  This normalizes
+	   audio back to 0dB if enabled.
+
+       latency
+	   Compensate the delay introduced by using the lookahead buffer set
+	   with attack parameter. Also flush the valid audio data in the
+	   lookahead buffer when the stream hits EOF.
+
+       Depending on picked setting it is recommended to upsample input 2x or
+       4x times with aresample before applying this filter.
+
+   allpass
+       Apply a two-pole all-pass filter with central frequency (in Hz)
+       frequency, and filter-width width.  An all-pass filter changes the
+       audio's frequency to phase relationship without changing its frequency
+       to amplitude relationship.
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set frequency in Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       order, o
+	   Set the filter order, can be 1 or 2. Default is 2.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change allpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change allpass width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change allpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change allpass mix.	Syntax for the command is : "mix"
+
+   aloop
+       Loop audio samples.
+
+       The filter accepts the following options:
+
+       loop
+	   Set the number of loops. Setting this value to -1 will result in
+	   infinite loops.  Default is 0.
+
+       size
+	   Set maximal number of samples. Default is 0.
+
+       start
+	   Set first sample of loop. Default is 0.
+
+       time
+	   Set the time of loop start in seconds.  Only used if option named
+	   start is set to "-1".
+
+   amerge
+       Merge two or more audio streams into a single multi-channel stream.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set the number of inputs. Default is 2.
+
+       If the channel layouts of the inputs are disjoint, and therefore
+       compatible, the channel layout of the output will be set accordingly
+       and the channels will be reordered as necessary. If the channel layouts
+       of the inputs are not disjoint, the output will have all the channels
+       of the first input then all the channels of the second input, in that
+       order, and the channel layout of the output will be the default value
+       corresponding to the total number of channels.
+
+       For example, if the first input is in 2.1 (FL+FR+LF) and the second
+       input is FC+BL+BR, then the output will be in 5.1, with the channels in
+       the following order: a1, a2, b1, a3, b2, b3 (a1 is the first channel of
+       the first input, b1 is the first channel of the second input).
+
+       On the other hand, if both input are in stereo, the output channels
+       will be in the default order: a1, a2, b1, b2, and the channel layout
+       will be arbitrarily set to 4.0, which may or may not be the expected
+       value.
+
+       All inputs must have the same sample rate, and format.
+
+       If inputs do not have the same duration, the output will stop with the
+       shortest.
+
+       Examples
+
+       o   Merge two mono files into a stereo stream:
+
+		   amovie=left.wav [l] ; amovie=right.mp3 [r] ; [l] [r] amerge
+
+       o   Multiple merges assuming 1 video stream and 6 audio streams in
+	   input.mkv:
+
+		   ffmpeg -i input.mkv -filter_complex "[0:1][0:2][0:3][0:4][0:5][0:6] amerge=inputs=6" -c:a pcm_s16le output.mkv
+
+   amix
+       Mixes multiple audio inputs into a single output.
+
+       Note that this filter only supports float samples (the amerge and pan
+       audio filters support many formats). If the amix input has integer
+       samples then aresample will be automatically inserted to perform the
+       conversion to float samples.
+
+       It accepts the following parameters:
+
+       inputs
+	   The number of inputs. If unspecified, it defaults to 2.
+
+       duration
+	   How to determine the end-of-stream.
+
+	   longest
+	       The duration of the longest input. (default)
+
+	   shortest
+	       The duration of the shortest input.
+
+	   first
+	       The duration of the first input.
+
+       dropout_transition
+	   The transition time, in seconds, for volume renormalization when an
+	   input stream ends. The default value is 2 seconds.
+
+       weights
+	   Specify weight of each input audio stream as a sequence of numbers
+	   separated by a space. If fewer weights are specified compared to
+	   number of inputs, the last weight is assigned to the remaining
+	   inputs.  Default weight for each input is 1.
+
+       normalize
+	   Always scale inputs instead of only doing summation of samples.
+	   Beware of heavy clipping if inputs are not normalized prior or
+	   after filtering by this filter if this option is disabled. By
+	   default is enabled.
+
+       Examples
+
+       o   This will mix 3 input audio streams to a single output with the
+	   same duration as the first input and a dropout transition time of 3
+	   seconds:
+
+		   ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex amix=inputs=3:duration=first:dropout_transition=3 OUTPUT
+
+       o   This will mix one vocal and one music input audio stream to a
+	   single output with the same duration as the longest input. The
+	   music will have quarter the weight as the vocals, and the inputs
+	   are not normalized:
+
+		   ffmpeg -i VOCALS -i MUSIC -filter_complex amix=inputs=2:duration=longest:dropout_transition=0:weights="1 0.25":normalize=0 OUTPUT
+
+       Commands
+
+       This filter supports the following commands:
+
+       weights
+       normalize
+	   Syntax is same as option with same name.
+
+   amultiply
+       Multiply first audio stream with second audio stream and store result
+       in output audio stream. Multiplication is done by multiplying each
+       sample from first stream with sample at same position from second
+       stream.
+
+       With this element-wise multiplication one can create amplitude fades
+       and amplitude modulations.
+
+   anequalizer
+       High-order parametric multiband equalizer for each channel.
+
+       It accepts the following parameters:
+
+       params
+	   This option string is in format: "cchn f=cf w=w g=g t=f | ..."
+	   Each equalizer band is separated by '|'.
+
+	   chn Set channel number to which equalization will be applied.  If
+	       input doesn't have that channel the entry is ignored.
+
+	   f   Set central frequency for band.	If input doesn't have that
+	       frequency the entry is ignored.
+
+	   w   Set band width in Hertz.
+
+	   g   Set band gain in dB.
+
+	   t   Set filter type for band, optional, can be:
+
+	       0   Butterworth, this is default.
+
+	       1   Chebyshev type 1.
+
+	       2   Chebyshev type 2.
+
+       curves
+	   With this option activated frequency response of anequalizer is
+	   displayed in video stream.
+
+       size
+	   Set video stream size. Only useful if curves option is activated.
+
+       mgain
+	   Set max gain that will be displayed. Only useful if curves option
+	   is activated.  Setting this to a reasonable value makes it possible
+	   to display gain which is derived from neighbour bands which are too
+	   close to each other and thus produce higher gain when both are
+	   activated.
+
+       fscale
+	   Set frequency scale used to draw frequency response in video
+	   output.  Can be linear or logarithmic. Default is logarithmic.
+
+       colors
+	   Set color for each channel curve which is going to be displayed in
+	   video stream.  This is list of color names separated by space or by
+	   '|'.  Unrecognised or missing colors will be replaced by white
+	   color.
+
+       Examples
+
+       o   Lower gain by 10 of central frequency 200Hz and width 100 Hz for
+	   first 2 channels using Chebyshev type 1 filter:
+
+		   anequalizer=c0 f=200 w=100 g=-10 t=1|c1 f=200 w=100 g=-10 t=1
+
+       Commands
+
+       This filter supports the following commands:
+
+       change
+	   Alter existing filter parameters.  Syntax for the commands is :
+	   "fN|f=freq|w=width|g=gain"
+
+	   fN is existing filter number, starting from 0, if no such filter is
+	   available error is returned.  freq set new frequency parameter.
+	   width set new width parameter in Hertz.  gain set new gain
+	   parameter in dB.
+
+	   Full filter invocation with asendcmd may look like this:
+	   asendcmd=c='4.0 anequalizer change
+	   0|f=200|w=50|g=1',anequalizer=...
+
+   anlmdn
+       Reduce broadband noise in audio samples using Non-Local Means
+       algorithm.
+
+       Each sample is adjusted by looking for other samples with similar
+       contexts. This context similarity is defined by comparing their
+       surrounding patches of size p. Patches are searched in an area of r
+       around the sample.
+
+       The filter accepts the following options:
+
+       strength, s
+	   Set denoising strength. Allowed range is from 0.00001 to 10000.
+	   Default value is 0.00001.
+
+       patch, p
+	   Set patch radius duration. Allowed range is from 1 to 100
+	   milliseconds.  Default value is 2 milliseconds.
+
+       research, r
+	   Set research radius duration. Allowed range is from 2 to 300
+	   milliseconds.  Default value is 6 milliseconds.
+
+       output, o
+	   Set the output mode.
+
+	   It accepts the following values:
+
+	   i   Pass input unchanged.
+
+	   o   Pass noise filtered out.
+
+	   n   Pass only noise.
+
+	       Default value is o.
+
+       smooth, m
+	   Set smooth factor. Default value is 11. Allowed range is from 1 to
+	   1000.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   anlmf, anlms
+       Apply Normalized Least-Mean-(Squares|Fourth) algorithm to the first
+       audio stream using the second audio stream.
+
+       This adaptive filter is used to mimic a desired filter by finding the
+       filter coefficients that relate to producing the least mean square of
+       the error signal (difference between the desired, 2nd input audio
+       stream and the actual signal, the 1st input audio stream).
+
+       A description of the accepted options follows.
+
+       order
+	   Set filter order.
+
+       mu  Set filter mu.
+
+       eps Set the filter eps.
+
+       leakage
+	   Set the filter leakage.
+
+       out_mode
+	   It accepts the following values:
+
+	   i   Pass the 1st input.
+
+	   d   Pass the 2nd input.
+
+	   o   Pass difference between desired, 2nd input and error signal
+	       estimate.
+
+	   n   Pass difference between input, 1st input and error signal
+	       estimate.
+
+	   e   Pass error signal estimated samples.
+
+	       Default value is o.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+       Examples
+
+       o   One of many usages of this filter is noise reduction, input audio
+	   is filtered with same samples that are delayed by fixed amount, one
+	   such example for stereo audio is:
+
+		   asplit[a][b],[a]adelay=32S|32S[a],[b][a]anlms=order=128:leakage=0.0005:mu=.5:out_mode=o
+
+       Commands
+
+       This filter supports the same commands as options, excluding option
+       "order".
+
+   anull
+       Pass the audio source unchanged to the output.
+
+   apad
+       Pad the end of an audio stream with silence.
+
+       This can be used together with ffmpeg -shortest to extend audio streams
+       to the same length as the video stream.
+
+       A description of the accepted options follows.
+
+       packet_size
+	   Set silence packet size. Default value is 4096.
+
+       pad_len
+	   Set the number of samples of silence to add to the end. After the
+	   value is reached, the stream is terminated. This option is mutually
+	   exclusive with whole_len.
+
+       whole_len
+	   Set the minimum total number of samples in the output audio stream.
+	   If the value is longer than the input audio length, silence is
+	   added to the end, until the value is reached. This option is
+	   mutually exclusive with pad_len.
+
+       pad_dur
+	   Specify the duration of samples of silence to add. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax. Used only if set to non-negative value.
+
+       whole_dur
+	   Specify the minimum total duration in the output audio stream. See
+	   the Time duration section in the ffmpeg-utils(1) manual for the
+	   accepted syntax. Used only if set to non-negative value. If the
+	   value is longer than the input audio length, silence is added to
+	   the end, until the value is reached.  This option is mutually
+	   exclusive with pad_dur
+
+       If neither the pad_len nor the whole_len nor pad_dur nor whole_dur
+       option is set, the filter will add silence to the end of the input
+       stream indefinitely.
+
+       Note that for ffmpeg 4.4 and earlier a zero pad_dur or whole_dur also
+       caused the filter to add silence indefinitely.
+
+       Examples
+
+       o   Add 1024 samples of silence to the end of the input:
+
+		   apad=pad_len=1024
+
+       o   Make sure the audio output will contain at least 10000 samples, pad
+	   the input with silence if required:
+
+		   apad=whole_len=10000
+
+       o   Use ffmpeg to pad the audio input with silence, so that the video
+	   stream will always result the shortest and will be converted until
+	   the end in the output file when using the shortest option:
+
+		   ffmpeg -i VIDEO -i AUDIO -filter_complex "[1:0]apad" -shortest OUTPUT
+
+   aphaser
+       Add a phasing effect to the input audio.
+
+       A phaser filter creates series of peaks and troughs in the frequency
+       spectrum.  The position of the peaks and troughs are modulated so that
+       they vary over time, creating a sweeping effect.
+
+       A description of the accepted parameters follows.
+
+       in_gain
+	   Set input gain. Default is 0.4.
+
+       out_gain
+	   Set output gain. Default is 0.74
+
+       delay
+	   Set delay in milliseconds. Default is 3.0.
+
+       decay
+	   Set decay. Default is 0.4.
+
+       speed
+	   Set modulation speed in Hz. Default is 0.5.
+
+       type
+	   Set modulation type. Default is triangular.
+
+	   It accepts the following values:
+
+	   triangular, t
+	   sinusoidal, s
+
+   aphaseshift
+       Apply phase shift to input audio samples.
+
+       The filter accepts the following options:
+
+       shift
+	   Specify phase shift. Allowed range is from -1.0 to 1.0.  Default
+	   value is 0.0.
+
+       level
+	   Set output gain applied to final output. Allowed range is from 0.0
+	   to 1.0.  Default value is 1.0.
+
+       order
+	   Set filter order used for filtering. Allowed range is from 1 to 16.
+	   Default value is 8.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   apsnr
+       Measure Audio Peak Signal-to-Noise Ratio.
+
+       This filter takes two audio streams for input, and outputs first audio
+       stream.	Results are in dB per channel at end of either input.
+
+   apsyclip
+       Apply Psychoacoustic clipper to input audio stream.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. By default it is 1. Range is [0.015625 - 64].
+
+       level_out
+	   Set output gain. By default it is 1. Range is [0.015625 - 64].
+
+       clip
+	   Set the clipping start value. Default value is 0dBFS or 1.
+
+       diff
+	   Output only difference samples, useful to hear introduced
+	   distortions.  By default is disabled.
+
+       adaptive
+	   Set strength of adaptive distortion applied. Default value is 0.5.
+	   Allowed range is from 0 to 1.
+
+       iterations
+	   Set number of iterations of psychoacoustic clipper.	Allowed range
+	   is from 1 to 20. Default value is 10.
+
+       level
+	   Auto level output signal. Default is disabled.  This normalizes
+	   audio back to 0dBFS if enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   apulsator
+       Audio pulsator is something between an autopanner and a tremolo.  But
+       it can produce funny stereo effects as well. Pulsator changes the
+       volume of the left and right channel based on a LFO (low frequency
+       oscillator) with different waveforms and shifted phases.  This filter
+       have the ability to define an offset between left and right channel. An
+       offset of 0 means that both LFO shapes match each other.  The left and
+       right channel are altered equally - a conventional tremolo.  An offset
+       of 50% means that the shape of the right channel is exactly shifted in
+       phase (or moved backwards about half of the frequency) - pulsator acts
+       as an autopanner. At 1 both curves match again. Every setting in
+       between moves the phase shift gapless between all stages and produces
+       some "bypassing" sounds with sine and triangle waveforms. The more you
+       set the offset near 1 (starting from the 0.5) the faster the signal
+       passes from the left to the right speaker.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. By default it is 1. Range is [0.015625 - 64].
+
+       level_out
+	   Set output gain. By default it is 1. Range is [0.015625 - 64].
+
+       mode
+	   Set waveform shape the LFO will use. Can be one of: sine, triangle,
+	   square, sawup or sawdown. Default is sine.
+
+       amount
+	   Set modulation. Define how much of original signal is affected by
+	   the LFO.
+
+       offset_l
+	   Set left channel offset. Default is 0. Allowed range is [0 - 1].
+
+       offset_r
+	   Set right channel offset. Default is 0.5. Allowed range is [0 - 1].
+
+       width
+	   Set pulse width. Default is 1. Allowed range is [0 - 2].
+
+       timing
+	   Set possible timing mode. Can be one of: bpm, ms or hz. Default is
+	   hz.
+
+       bpm Set bpm. Default is 120. Allowed range is [30 - 300]. Only used if
+	   timing is set to bpm.
+
+       ms  Set ms. Default is 500. Allowed range is [10 - 2000]. Only used if
+	   timing is set to ms.
+
+       hz  Set frequency in Hz. Default is 2. Allowed range is [0.01 - 100].
+	   Only used if timing is set to hz.
+
+   aresample
+       Resample the input audio to the specified parameters, using the
+       libswresample library. If none are specified then the filter will
+       automatically convert between its input and output.
+
+       This filter is also able to stretch/squeeze the audio data to make it
+       match the timestamps or to inject silence / cut out audio to make it
+       match the timestamps, do a combination of both or do neither.
+
+       The filter accepts the syntax [sample_rate:]resampler_options, where
+       sample_rate expresses a sample rate and resampler_options is a list of
+       key=value pairs, separated by ":". See the "Resampler Options" section
+       in the ffmpeg-resampler(1) manual for the complete list of supported
+       options.
+
+       Examples
+
+       o   Resample the input audio to 44100Hz:
+
+		   aresample=44100
+
+       o   Stretch/squeeze samples to the given timestamps, with a maximum of
+	   1000 samples per second compensation:
+
+		   aresample=async=1000
+
+   areverse
+       Reverse an audio clip.
+
+       Warning: This filter requires memory to buffer the entire clip, so
+       trimming is suggested.
+
+       Examples
+
+       o   Take the first 5 seconds of a clip, and reverse it.
+
+		   atrim=end=5,areverse
+
+   arls
+       Apply Recursive Least Squares algorithm to the first audio stream using
+       the second audio stream.
+
+       This adaptive filter is used to mimic a desired filter by recursively
+       finding the filter coefficients that relate to producing the minimal
+       weighted linear least squares cost function of the error signal
+       (difference between the desired, 2nd input audio stream and the actual
+       signal, the 1st input audio stream).
+
+       A description of the accepted options follows.
+
+       order
+	   Set the filter order.
+
+       lambda
+	   Set the forgetting factor.
+
+       delta
+	   Set the coefficient to initialize internal covariance matrix.
+
+       out_mode
+	   Set the filter output samples. It accepts the following values:
+
+	   i   Pass the 1st input.
+
+	   d   Pass the 2nd input.
+
+	   o   Pass difference between desired, 2nd input and error signal
+	       estimate.
+
+	   n   Pass difference between input, 1st input and error signal
+	       estimate.
+
+	   e   Pass error signal estimated samples.
+
+	       Default value is o.
+
+       precision
+	   Set which precision to use when processing samples.
+
+	   auto
+	       Auto pick internal sample format depending on other filters.
+
+	   float
+	       Always use single-floating point precision sample format.
+
+	   double
+	       Always use double-floating point precision sample format.
+
+   arnndn
+       Reduce noise from speech using Recurrent Neural Networks.
+
+       This filter accepts the following options:
+
+       model, m
+	   Set train model file to load. This option is always required.
+
+       mix Set how much to mix filtered samples into final output.  Allowed
+	   range is from -1 to 1. Default value is 1.  Negative values are
+	   special, they set how much to keep filtered noise in the final
+	   filter output. Set this option to -1 to hear actual noise removed
+	   from input signal.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asdr
+       Measure Audio Signal-to-Distortion Ratio.
+
+       This filter takes two audio streams for input, and outputs first audio
+       stream.	Results are in dB per channel at end of either input.
+
+   asetnsamples
+       Set the number of samples per each output audio frame.
+
+       The last output packet may contain a different number of samples, as
+       the filter will flush all the remaining samples when the input audio
+       signals its end.
+
+       The filter accepts the following options:
+
+       nb_out_samples, n
+	   Set the number of frames per each output audio frame. The number is
+	   intended as the number of samples per each channel.	Default value
+	   is 1024.
+
+       pad, p
+	   If set to 1, the filter will pad the last audio frame with zeroes,
+	   so that the last frame will contain the same number of samples as
+	   the previous ones. Default value is 1.
+
+       For example, to set the number of per-frame samples to 1234 and disable
+       padding for the last frame, use:
+
+	       asetnsamples=n=1234:p=0
+
+   asetrate
+       Set the sample rate without altering the PCM data.  This will result in
+       a change of speed and pitch.
+
+       The filter accepts the following options:
+
+       sample_rate, r
+	   Set the output sample rate. Default is 44100 Hz.
+
+   ashowinfo
+       Show a line containing various information for each input audio frame.
+       The input audio is not modified.
+
+       The shown line contains a sequence of key/value pairs of the form
+       key:value.
+
+       The following values are shown in the output:
+
+       n   The (sequential) number of the input frame, starting from 0.
+
+       pts The presentation timestamp of the input frame, in time base units;
+	   the time base depends on the filter input pad, and is usually
+	   1/sample_rate.
+
+       pts_time
+	   The presentation timestamp of the input frame in seconds.
+
+       fmt The sample format.
+
+       chlayout
+	   The channel layout.
+
+       rate
+	   The sample rate for the audio frame.
+
+       nb_samples
+	   The number of samples (per channel) in the frame.
+
+       checksum
+	   The Adler-32 checksum (printed in hexadecimal) of the audio data.
+	   For planar audio, the data is treated as if all the planes were
+	   concatenated.
+
+       plane_checksums
+	   A list of Adler-32 checksums for each data plane.
+
+   asisdr
+       Measure Audio Scaled-Invariant Signal-to-Distortion Ratio.
+
+       This filter takes two audio streams for input, and outputs first audio
+       stream.	Results are in dB per channel at end of either input.
+
+   asoftclip
+       Apply audio soft clipping.
+
+       Soft clipping is a type of distortion effect where the amplitude of a
+       signal is saturated along a smooth curve, rather than the abrupt shape
+       of hard-clipping.
+
+       This filter accepts the following options:
+
+       type
+	   Set type of soft-clipping.
+
+	   It accepts the following values:
+
+	   hard
+	   tanh
+	   atan
+	   cubic
+	   exp
+	   alg
+	   quintic
+	   sin
+	   erf
+       threshold
+	   Set threshold from where to start clipping. Default value is 0dB or
+	   1.
+
+       output
+	   Set gain applied to output. Default value is 0dB or 1.
+
+       param
+	   Set additional parameter which controls sigmoid function.
+
+       oversample
+	   Set oversampling factor.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   aspectralstats
+       Display frequency domain statistical information about the audio
+       channels.  Statistics are calculated and stored as metadata for each
+       audio channel and for each audio frame.
+
+       It accepts the following option:
+
+       win_size
+	   Set the window length in samples. Default value is 2048.  Allowed
+	   range is from 32 to 65536.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann, hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hann".
+
+       overlap
+	   Set window overlap. Allowed range is from 0 to 1. Default value is
+	   0.5.
+
+       measure
+	   Select the parameters which are measured. The metadata keys can be
+	   used as flags, default is all which measures everything.  none
+	   disables all measurement.
+
+       A list of each metadata key follows:
+
+       mean
+       variance
+       centroid
+       spread
+       skewness
+       kurtosis
+       entropy
+       flatness
+       crest
+       flux
+       slope
+       decrease
+       rolloff
+
+   asr
+       Automatic Speech Recognition
+
+       This filter uses PocketSphinx for speech recognition. To enable
+       compilation of this filter, you need to configure FFmpeg with
+       "--enable-pocketsphinx".
+
+       It accepts the following options:
+
+       rate
+	   Set sampling rate of input audio. Defaults is 16000.  This need to
+	   match speech models, otherwise one will get poor results.
+
+       hmm Set dictionary containing acoustic model files.
+
+       dict
+	   Set pronunciation dictionary.
+
+       lm  Set language model file.
+
+       lmctl
+	   Set language model set.
+
+       lmname
+	   Set which language model to use.
+
+       logfn
+	   Set output for log messages.
+
+       The filter exports recognized speech as the frame metadata
+       "lavfi.asr.text".
+
+   astats
+       Display time domain statistical information about the audio channels.
+       Statistics are calculated and displayed for each audio channel and,
+       where applicable, an overall figure is also given.
+
+       It accepts the following option:
+
+       length
+	   Short window length in seconds, used for peak and trough RMS
+	   measurement.  Default is 0.05 (50 milliseconds). Allowed range is
+	   "[0 - 10]".
+
+       metadata
+	   Set metadata injection. All the metadata keys are prefixed with
+	   "lavfi.astats.X", where "X" is channel number starting from 1 or
+	   string "Overall". Default is disabled.
+
+	   Available keys for each channel are: Bit_depth Crest_factor
+	   DC_offset Dynamic_range Entropy Flat_factor Max_difference
+	   Max_level Mean_difference Min_difference Min_level Noise_floor
+	   Noise_floor_count Number_of_Infs Number_of_NaNs Number_of_denormals
+	   Peak_count Abs_Peak_count Peak_level RMS_difference RMS_peak
+	   RMS_trough Zero_crossings Zero_crossings_rate
+
+	   and for "Overall": Bit_depth DC_offset Entropy Flat_factor
+	   Max_difference Max_level Mean_difference Min_difference Min_level
+	   Noise_floor Noise_floor_count Number_of_Infs Number_of_NaNs
+	   Number_of_denormals Number_of_samples Peak_count Abs_Peak_count
+	   Peak_level RMS_difference RMS_level RMS_peak RMS_trough
+
+	   For example, a full key looks like "lavfi.astats.1.DC_offset" or
+	   "lavfi.astats.Overall.Peak_count".
+
+	   Read below for the description of the keys.
+
+       reset
+	   Set the number of frames over which cumulative stats are calculated
+	   before being reset. Default is disabled.
+
+       measure_perchannel
+	   Select the parameters which are measured per channel. The metadata
+	   keys can be used as flags, default is all which measures
+	   everything.	none disables all per channel measurement.
+
+       measure_overall
+	   Select the parameters which are measured overall. The metadata keys
+	   can be used as flags, default is all which measures everything.
+	   none disables all overall measurement.
+
+       A description of the measure keys follow:
+
+       none
+	   no measures
+
+       all all measures
+
+       Bit_depth
+	   overall bit depth of audio, i.e. number of bits used for each
+	   sample
+
+       Crest_factor
+	   standard ratio of peak to RMS level (note: not in dB)
+
+       DC_offset
+	   mean amplitude displacement from zero
+
+       Dynamic_range
+	   measured dynamic range of audio in dB
+
+       Entropy
+	   entropy measured across whole audio, entropy of value near 1.0 is
+	   typically measured for white noise
+
+       Flat_factor
+	   flatness (i.e. consecutive samples with the same value) of the
+	   signal at its peak levels (i.e. either Min_level or Max_level)
+
+       Max_difference
+	   maximal difference between two consecutive samples
+
+       Max_level
+	   maximal sample level
+
+       Mean_difference
+	   mean difference between two consecutive samples, i.e. the average
+	   of each difference between two consecutive samples
+
+       Min_difference
+	   minimal difference between two consecutive samples
+
+       Min_level
+	   minimal sample level
+
+       Noise_floor
+	   minimum local peak measured in dBFS over a short window
+
+       Noise_floor_count
+	   number of occasions (not the number of samples) that the signal
+	   attained Noise floor
+
+       Number_of_Infs
+	   number of samples with an infinite value
+
+       Number_of_NaNs
+	   number of samples with a NaN (not a number) value
+
+       Number_of_denormals
+	   number of samples with a subnormal value
+
+       Number_of_samples
+	   number of samples
+
+       Peak_count
+	   number of occasions (not the number of samples) that the signal
+	   attained either Min_level or Max_level
+
+       Abs_Peak_count
+	   number of occasions that the absolute samples taken from the signal
+	   attained max absolute value of Min_level and Max_level
+
+       Peak_level
+	   standard peak level measured in dBFS
+
+       RMS_difference
+	   Root Mean Square difference between two consecutive samples
+
+       RMS_level
+	   standard RMS level measured in dBFS
+
+       RMS_peak
+       RMS_trough
+	   peak and trough values for RMS level measured over a short window,
+	   measured in dBFS.
+
+       Zero crossings
+	   number of points where the waveform crosses the zero level axis
+
+       Zero crossings rate
+	   rate of Zero crossings and number of audio samples
+
+   asubboost
+       Boost subwoofer frequencies.
+
+       The filter accepts the following options:
+
+       dry Set dry gain, how much of original signal is kept. Allowed range is
+	   from 0 to 1.  Default value is 1.0.
+
+       wet Set wet gain, how much of filtered signal is kept. Allowed range is
+	   from 0 to 1.  Default value is 1.0.
+
+       boost
+	   Set max boost factor. Allowed range is from 1 to 12. Default value
+	   is 2.
+
+       decay
+	   Set delay line decay gain value. Allowed range is from 0 to 1.
+	   Default value is 0.0.
+
+       feedback
+	   Set delay line feedback gain value. Allowed range is from 0 to 1.
+	   Default value is 0.9.
+
+       cutoff
+	   Set cutoff frequency in Hertz. Allowed range is 50 to 900.  Default
+	   value is 100.
+
+       slope
+	   Set slope amount for cutoff frequency. Allowed range is 0.0001 to
+	   1.  Default value is 0.5.
+
+       delay
+	   Set delay. Allowed range is from 1 to 100.  Default value is 20.
+
+       channels
+	   Set the channels to process. Default value is all available.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asubcut
+       Cut subwoofer frequencies.
+
+       This filter allows to set custom, steeper roll off than highpass
+       filter, and thus is able to more attenuate frequency content in stop-
+       band.
+
+       The filter accepts the following options:
+
+       cutoff
+	   Set cutoff frequency in Hertz. Allowed range is 2 to 200.  Default
+	   value is 20.
+
+       order
+	   Set filter order. Available values are from 3 to 20.  Default value
+	   is 10.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 1. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asupercut
+       Cut super frequencies.
+
+       The filter accepts the following options:
+
+       cutoff
+	   Set cutoff frequency in Hertz. Allowed range is 20000 to 192000.
+	   Default value is 20000.
+
+       order
+	   Set filter order. Available values are from 3 to 20.  Default value
+	   is 10.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 1. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asuperpass
+       Apply high order Butterworth band-pass filter.
+
+       The filter accepts the following options:
+
+       centerf
+	   Set center frequency in Hertz. Allowed range is 2 to 999999.
+	   Default value is 1000.
+
+       order
+	   Set filter order. Available values are from 4 to 20.  Default value
+	   is 4.
+
+       qfactor
+	   Set Q-factor. Allowed range is from 0.01 to 100. Default value is
+	   1.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 2. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   asuperstop
+       Apply high order Butterworth band-stop filter.
+
+       The filter accepts the following options:
+
+       centerf
+	   Set center frequency in Hertz. Allowed range is 2 to 999999.
+	   Default value is 1000.
+
+       order
+	   Set filter order. Available values are from 4 to 20.  Default value
+	   is 4.
+
+       qfactor
+	   Set Q-factor. Allowed range is from 0.01 to 100. Default value is
+	   1.
+
+       level
+	   Set input gain level. Allowed range is from 0 to 2. Default value
+	   is 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   atempo
+       Adjust audio tempo.
+
+       The filter accepts exactly one parameter, the audio tempo. If not
+       specified then the filter will assume nominal 1.0 tempo. Tempo must be
+       in the [0.5, 100.0] range.
+
+       Note that tempo greater than 2 will skip some samples rather than blend
+       them in.  If for any reason this is a concern it is always possible to
+       daisy-chain several instances of atempo to achieve the desired product
+       tempo.
+
+       Examples
+
+       o   Slow down audio to 80% tempo:
+
+		   atempo=0.8
+
+       o   To speed up audio to 300% tempo:
+
+		   atempo=3
+
+       o   To speed up audio to 300% tempo by daisy-chaining two atempo
+	   instances:
+
+		   atempo=sqrt(3),atempo=sqrt(3)
+
+       Commands
+
+       This filter supports the following commands:
+
+       tempo
+	   Change filter tempo scale factor.  Syntax for the command is :
+	   "tempo"
+
+   atilt
+       Apply spectral tilt filter to audio stream.
+
+       This filter apply any spectral roll-off slope over any specified
+       frequency band.
+
+       The filter accepts the following options:
+
+       freq
+	   Set central frequency of tilt in Hz. Default is 10000 Hz.
+
+       slope
+	   Set slope direction of tilt. Default is 0. Allowed range is from -1
+	   to 1.
+
+       width
+	   Set width of tilt. Default is 1000. Allowed range is from 100 to
+	   10000.
+
+       order
+	   Set order of tilt filter.
+
+       level
+	   Set input volume level. Allowed range is from 0 to 4.  Default is
+	   1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   atrim
+       Trim the input so that the output contains one continuous subpart of
+       the input.
+
+       It accepts the following parameters:
+
+       start
+	   Timestamp (in seconds) of the start of the section to keep. I.e.
+	   the audio sample with the timestamp start will be the first sample
+	   in the output.
+
+       end Specify time of the first audio sample that will be dropped, i.e.
+	   the audio sample immediately preceding the one with the timestamp
+	   end will be the last sample in the output.
+
+       start_pts
+	   Same as start, except this option sets the start timestamp in
+	   samples instead of seconds.
+
+       end_pts
+	   Same as end, except this option sets the end timestamp in samples
+	   instead of seconds.
+
+       duration
+	   The maximum duration of the output in seconds.
+
+       start_sample
+	   The number of the first sample that should be output.
+
+       end_sample
+	   The number of the first sample that should be dropped.
+
+       start, end, and duration are expressed as time duration specifications;
+       see the Time duration section in the ffmpeg-utils(1) manual.
+
+       Note that the first two sets of the start/end options and the duration
+       option look at the frame timestamp, while the _sample options simply
+       count the samples that pass through the filter. So start/end_pts and
+       start/end_sample will give different results when the timestamps are
+       wrong, inexact or do not start at zero. Also note that this filter does
+       not modify the timestamps. If you wish to have the output timestamps
+       start at zero, insert the asetpts filter after the atrim filter.
+
+       If multiple start or end options are set, this filter tries to be
+       greedy and keep all samples that match at least one of the specified
+       constraints. To keep only the part that matches all the constraints at
+       once, chain multiple atrim filters.
+
+       The defaults are such that all the input is kept. So it is possible to
+       set e.g.  just the end values to keep everything before the specified
+       time.
+
+       Examples:
+
+       o   Drop everything except the second minute of input:
+
+		   ffmpeg -i INPUT -af atrim=60:120
+
+       o   Keep only the first 1000 samples:
+
+		   ffmpeg -i INPUT -af atrim=end_sample=1000
+
+   axcorrelate
+       Calculate normalized windowed cross-correlation between two input audio
+       streams.
+
+       Resulted samples are always between -1 and 1 inclusive.	If result is 1
+       it means two input samples are highly correlated in that selected
+       segment.  Result 0 means they are not correlated at all.  If result is
+       -1 it means two input samples are out of phase, which means they cancel
+       each other.
+
+       The filter accepts the following options:
+
+       size
+	   Set size of segment over which cross-correlation is calculated.
+	   Default is 256. Allowed range is from 2 to 131072.
+
+       algo
+	   Set algorithm for cross-correlation. Can be "slow" or "fast" or
+	   "best".  Default is "best". Fast algorithm assumes mean values over
+	   any given segment are always zero and thus need much less
+	   calculations to make.  This is generally not true, but is valid for
+	   typical audio streams.
+
+       Examples
+
+       o   Calculate correlation between channels in stereo audio stream:
+
+		   ffmpeg -i stereo.wav -af channelsplit,axcorrelate=size=1024:algo=fast correlation.wav
+
+   bandpass
+       Apply a two-pole Butterworth band-pass filter with central frequency
+       frequency, and (3dB-point) band-width width.  The csg option selects a
+       constant skirt gain (peak gain = Q) instead of the default: constant
+       0dB peak gain.  The filter roll off at 6dB per octave (20dB per
+       decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the filter's central frequency. Default is 3000.
+
+       csg Constant skirt gain if set to 1. Defaults to 0.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change bandpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change bandpass width_type.	Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change bandpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change bandpass mix.  Syntax for the command is : "mix"
+
+   bandreject
+       Apply a two-pole Butterworth band-reject filter with central frequency
+       frequency, and (3dB-point) band-width width.  The filter roll off at
+       6dB per octave (20dB per decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the filter's central frequency. Default is 3000.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change bandreject frequency.  Syntax for the command is :
+	   "frequency"
+
+       width_type, t
+	   Change bandreject width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change bandreject width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change bandreject mix.  Syntax for the command is : "mix"
+
+   bass, lowshelf
+       Boost or cut the bass (lower) frequencies of the audio using a two-pole
+       shelving filter with a response similar to that of a standard hi-fi's
+       tone-controls. This is also known as shelving equalisation (EQ).
+
+       The filter accepts the following options:
+
+       gain, g
+	   Give the gain at 0 Hz. Its useful range is about -20 (for a large
+	   cut) to +20 (for a large boost).  Beware of clipping when using a
+	   positive gain.
+
+       frequency, f
+	   Set the filter's central frequency and so can be used to extend or
+	   reduce the frequency range to be boosted or cut.  The default value
+	   is 100 Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Determine how steep is the filter's shelf transition.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change bass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change bass width_type.  Syntax for the command is : "width_type"
+
+       width, w
+	   Change bass width.  Syntax for the command is : "width"
+
+       gain, g
+	   Change bass gain.  Syntax for the command is : "gain"
+
+       mix, m
+	   Change bass mix.  Syntax for the command is : "mix"
+
+   biquad
+       Apply a biquad IIR filter with the given coefficients.  Where b0, b1,
+       b2 and a0, a1, a2 are the numerator and denominator coefficients
+       respectively.  and channels, c specify which channels to filter, by
+       default all available are filtered.
+
+       Commands
+
+       This filter supports the following commands:
+
+       a0
+       a1
+       a2
+       b0
+       b1
+       b2  Change biquad parameter.  Syntax for the command is : "value"
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+   bs2b
+       Bauer stereo to binaural transformation, which improves headphone
+       listening of stereo audio records.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libbs2b".
+
+       It accepts the following parameters:
+
+       profile
+	   Pre-defined crossfeed level.
+
+	   default
+	       Default level (fcut=700, feed=50).
+
+	   cmoy
+	       Chu Moy circuit (fcut=700, feed=60).
+
+	   jmeier
+	       Jan Meier circuit (fcut=650, feed=95).
+
+       fcut
+	   Cut frequency (in Hz).
+
+       feed
+	   Feed level (in Hz).
+
+   channelmap
+       Remap input channels to new locations.
+
+       It accepts the following parameters:
+
+       map Map channels from input to output. The argument is a '|'-separated
+	   list of mappings, each in the "in_channel-out_channel" or
+	   "in_channel" form. in_channel can be either the name of the input
+	   channel (e.g. FL for front left) or its index in the input channel
+	   layout. out_channel is the name of the output channel or its index
+	   in the output channel layout. If out_channel is not given then it
+	   is implicitly an index, starting with zero and increasing by one
+	   for each mapping. Mixing different types of mappings is not allowed
+	   and will result in a parse error.
+
+       channel_layout
+	   The channel layout of the output stream. If not specified, then
+	   filter will guess it based on the out_channel names or the number
+	   of mappings.  Guessed layouts will not necessarily contain channels
+	   in the order of the mappings.
+
+       If no mapping is present, the filter will implicitly map input channels
+       to output channels, preserving indices.
+
+       Examples
+
+       o   For example, assuming a 5.1+downmix input MOV file,
+
+		   ffmpeg -i in.mov -filter 'channelmap=map=DL-FL|DR-FR' out.wav
+
+	   will create an output WAV file tagged as stereo from the downmix
+	   channels of the input.
+
+       o   To fix a 5.1 WAV improperly encoded in AAC's native channel order
+
+		   ffmpeg -i in.wav -filter 'channelmap=1|2|0|5|3|4:5.1' out.wav
+
+   channelsplit
+       Split each channel from an input audio stream into a separate output
+       stream.
+
+       It accepts the following parameters:
+
+       channel_layout
+	   The channel layout of the input stream. The default is "stereo".
+
+       channels
+	   A channel layout describing the channels to be extracted as
+	   separate output streams or "all" to extract each input channel as a
+	   separate stream. The default is "all".
+
+	   Choosing channels not present in channel layout in the input will
+	   result in an error.
+
+       Examples
+
+       o   For example, assuming a stereo input MP3 file,
+
+		   ffmpeg -i in.mp3 -filter_complex channelsplit out.mkv
+
+	   will create an output Matroska file with two audio streams, one
+	   containing only the left channel and the other the right channel.
+
+       o   Split a 5.1 WAV file into per-channel files:
+
+		   ffmpeg -i in.wav -filter_complex
+		   'channelsplit=channel_layout=5.1[FL][FR][FC][LFE][SL][SR]'
+		   -map '[FL]' front_left.wav -map '[FR]' front_right.wav -map '[FC]'
+		   front_center.wav -map '[LFE]' lfe.wav -map '[SL]' side_left.wav -map '[SR]'
+		   side_right.wav
+
+       o   Extract only LFE from a 5.1 WAV file:
+
+		   ffmpeg -i in.wav -filter_complex 'channelsplit=channel_layout=5.1:channels=LFE[LFE]'
+		   -map '[LFE]' lfe.wav
+
+   chorus
+       Add a chorus effect to the audio.
+
+       Can make a single vocal sound like a chorus, but can also be applied to
+       instrumentation.
+
+       Chorus resembles an echo effect with a short delay, but whereas with
+       echo the delay is constant, with chorus, it is varied using using
+       sinusoidal or triangular modulation.  The modulation depth defines the
+       range the modulated delay is played before or after the delay. Hence
+       the delayed sound will sound slower or faster, that is the delayed
+       sound tuned around the original one, like in a chorus where some vocals
+       are slightly off key.
+
+       It accepts the following parameters:
+
+       in_gain
+	   Set input gain. Default is 0.4.
+
+       out_gain
+	   Set output gain. Default is 0.4.
+
+       delays
+	   Set delays. A typical delay is around 40ms to 60ms.
+
+       decays
+	   Set decays.
+
+       speeds
+	   Set speeds.
+
+       depths
+	   Set depths.
+
+       Examples
+
+       o   A single delay:
+
+		   chorus=0.7:0.9:55:0.4:0.25:2
+
+       o   Two delays:
+
+		   chorus=0.6:0.9:50|60:0.4|0.32:0.25|0.4:2|1.3
+
+       o   Fuller sounding chorus with three delays:
+
+		   chorus=0.5:0.9:50|60|40:0.4|0.32|0.3:0.25|0.4|0.3:2|2.3|1.3
+
+   compand
+       Compress or expand the audio's dynamic range.
+
+       It accepts the following parameters:
+
+       attacks
+       decays
+	   A list of times in seconds for each channel over which the
+	   instantaneous level of the input signal is averaged to determine
+	   its volume. attacks refers to increase of volume and decays refers
+	   to decrease of volume. For most situations, the attack time
+	   (response to the audio getting louder) should be shorter than the
+	   decay time, because the human ear is more sensitive to sudden loud
+	   audio than sudden soft audio. A typical value for attack is 0.3
+	   seconds and a typical value for decay is 0.8 seconds.  If specified
+	   number of attacks & decays is lower than number of channels, the
+	   last set attack/decay will be used for all remaining channels.
+
+       points
+	   A list of points for the transfer function, specified in dB
+	   relative to the maximum possible signal amplitude. Each key points
+	   list must be defined using the following syntax:
+	   "x0/y0|x1/y1|x2/y2|...." or "x0/y0 x1/y1 x2/y2 ...."
+
+	   The input values must be in strictly increasing order but the
+	   transfer function does not have to be monotonically rising. The
+	   point "0/0" is assumed but may be overridden (by "0/out-dBn").
+	   Typical values for the transfer function are "-70/-70|-60/-20|1/0".
+
+       soft-knee
+	   Set the curve radius in dB for all joints. It defaults to 0.01.
+
+       gain
+	   Set the additional gain in dB to be applied at all points on the
+	   transfer function. This allows for easy adjustment of the overall
+	   gain.  It defaults to 0.
+
+       volume
+	   Set an initial volume, in dB, to be assumed for each channel when
+	   filtering starts. This permits the user to supply a nominal level
+	   initially, so that, for example, a very large gain is not applied
+	   to initial signal levels before the companding has begun to
+	   operate. A typical value for audio which is initially quiet is -90
+	   dB. It defaults to 0.
+
+       delay
+	   Set a delay, in seconds. The input audio is analyzed immediately,
+	   but audio is delayed before being fed to the volume adjuster.
+	   Specifying a delay approximately equal to the attack/decay times
+	   allows the filter to effectively operate in predictive rather than
+	   reactive mode. It defaults to 0.
+
+       Examples
+
+       o   Make music with both quiet and loud passages suitable for listening
+	   to in a noisy environment:
+
+		   compand=.3|.3:1|1:-90/-60|-60/-40|-40/-30|-20/-20:6:0:-90:0.2
+
+	   Another example for audio with whisper and explosion parts:
+
+		   compand=0|0:1|1:-90/-900|-70/-70|-30/-9|0/-3:6:0:0:0
+
+       o   A noise gate for when the noise is at a lower level than the
+	   signal:
+
+		   compand=.1|.1:.2|.2:-900/-900|-50.1/-900|-50/-50:.01:0:-90:.1
+
+       o   Here is another noise gate, this time for when the noise is at a
+	   higher level than the signal (making it, in some ways, similar to
+	   squelch):
+
+		   compand=.1|.1:.1|.1:-45.1/-45.1|-45/-900|0/-900:.01:45:-90:.1
+
+       o   2:1 compression starting at -6dB:
+
+		   compand=points=-80/-80|-6/-6|0/-3.8|20/3.5
+
+       o   2:1 compression starting at -9dB:
+
+		   compand=points=-80/-80|-9/-9|0/-5.3|20/2.9
+
+       o   2:1 compression starting at -12dB:
+
+		   compand=points=-80/-80|-12/-12|0/-6.8|20/1.9
+
+       o   2:1 compression starting at -18dB:
+
+		   compand=points=-80/-80|-18/-18|0/-9.8|20/0.7
+
+       o   3:1 compression starting at -15dB:
+
+		   compand=points=-80/-80|-15/-15|0/-10.8|20/-5.2
+
+       o   Compressor/Gate:
+
+		   compand=points=-80/-105|-62/-80|-15.4/-15.4|0/-12|20/-7.6
+
+       o   Expander:
+
+		   compand=attacks=0:points=-80/-169|-54/-80|-49.5/-64.6|-41.1/-41.1|-25.8/-15|-10.8/-4.5|0/0|20/8.3
+
+       o   Hard limiter at -6dB:
+
+		   compand=attacks=0:points=-80/-80|-6/-6|20/-6
+
+       o   Hard limiter at -12dB:
+
+		   compand=attacks=0:points=-80/-80|-12/-12|20/-12
+
+       o   Hard noise gate at -35 dB:
+
+		   compand=attacks=0:points=-80/-115|-35.1/-80|-35/-35|20/20
+
+       o   Soft limiter:
+
+		   compand=attacks=0:points=-80/-80|-12.4/-12.4|-6/-8|0/-6.8|20/-2.8
+
+   compensationdelay
+       Compensation Delay Line is a metric based delay to compensate differing
+       positions of microphones or speakers.
+
+       For example, you have recorded guitar with two microphones placed in
+       different locations. Because the front of sound wave has fixed speed in
+       normal conditions, the phasing of microphones can vary and depends on
+       their location and interposition. The best sound mix can be achieved
+       when these microphones are in phase (synchronized). Note that a
+       distance of ~30 cm between microphones makes one microphone capture the
+       signal in antiphase to the other microphone. That makes the final mix
+       sound moody.  This filter helps to solve phasing problems by adding
+       different delays to each microphone track and make them synchronized.
+
+       The best result can be reached when you take one track as base and
+       synchronize other tracks one by one with it.  Remember that
+       synchronization/delay tolerance depends on sample rate, too.  Higher
+       sample rates will give more tolerance.
+
+       The filter accepts the following parameters:
+
+       mm  Set millimeters distance. This is compensation distance for fine
+	   tuning.  Default is 0.
+
+       cm  Set cm distance. This is compensation distance for tightening
+	   distance setup.  Default is 0.
+
+       m   Set meters distance. This is compensation distance for hard
+	   distance setup.  Default is 0.
+
+       dry Set dry amount. Amount of unprocessed (dry) signal.	Default is 0.
+
+       wet Set wet amount. Amount of processed (wet) signal.  Default is 1.
+
+       temp
+	   Set temperature in degrees Celsius. This is the temperature of the
+	   environment.  Default is 20.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   crossfeed
+       Apply headphone crossfeed filter.
+
+       Crossfeed is the process of blending the left and right channels of
+       stereo audio recording.	It is mainly used to reduce extreme stereo
+       separation of low frequencies.
+
+       The intent is to produce more speaker like sound to the listener.
+
+       The filter accepts the following options:
+
+       strength
+	   Set strength of crossfeed. Default is 0.2. Allowed range is from 0
+	   to 1.  This sets gain of low shelf filter for side part of stereo
+	   image.  Default is -6dB. Max allowed is -30db when strength is set
+	   to 1.
+
+       range
+	   Set soundstage wideness. Default is 0.5. Allowed range is from 0 to
+	   1.  This sets cut off frequency of low shelf filter. Default is cut
+	   off near 1550 Hz. With range set to 1 cut off frequency is set to
+	   2100 Hz.
+
+       slope
+	   Set curve slope of low shelf filter. Default is 0.5.  Allowed range
+	   is from 0.01 to 1.
+
+       level_in
+	   Set input gain. Default is 0.9.
+
+       level_out
+	   Set output gain. Default is 1.
+
+       block_size
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   crystalizer
+       Simple algorithm for audio noise sharpening.
+
+       This filter linearly increases differences between each audio sample.
+
+       The filter accepts the following options:
+
+       i   Sets the intensity of effect (default: 2.0). Must be in range
+	   between -10.0 to 0 (unchanged sound) to 10.0 (maximum effect).  To
+	   inverse filtering use negative value.
+
+       c   Enable clipping. By default is enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   dcshift
+       Apply a DC shift to the audio.
+
+       This can be useful to remove a DC offset (caused perhaps by a hardware
+       problem in the recording chain) from the audio. The effect of a DC
+       offset is reduced headroom and hence volume. The astats filter can be
+       used to determine if a signal has a DC offset.
+
+       shift
+	   Set the DC shift, allowed range is [-1, 1]. It indicates the amount
+	   to shift the audio.
+
+       limitergain
+	   Optional. It should have a value much less than 1 (e.g. 0.05 or
+	   0.02) and is used to prevent clipping.
+
+   deesser
+       Apply de-essing to the audio samples.
+
+       i   Set intensity for triggering de-essing. Allowed range is from 0 to
+	   1.  Default is 0.
+
+       m   Set amount of ducking on treble part of sound. Allowed range is
+	   from 0 to 1.  Default is 0.5.
+
+       f   How much of original frequency content to keep when de-essing.
+	   Allowed range is from 0 to 1.  Default is 0.5.
+
+       s   Set the output mode.
+
+	   It accepts the following values:
+
+	   i   Pass input unchanged.
+
+	   o   Pass ess filtered out.
+
+	   e   Pass only ess.
+
+	       Default value is o.
+
+   dialoguenhance
+       Enhance dialogue in stereo audio.
+
+       This filter accepts stereo input and produce surround (3.0) channels
+       output.	The newly produced front center channel have enhanced speech
+       dialogue originally available in both stereo channels.  This filter
+       outputs front left and front right channels same as available in stereo
+       input.
+
+       The filter accepts the following options:
+
+       original
+	   Set the original center factor to keep in front center channel
+	   output.  Allowed range is from 0 to 1. Default value is 1.
+
+       enhance
+	   Set the dialogue enhance factor to put in front center channel
+	   output.  Allowed range is from 0 to 3. Default value is 1.
+
+       voice
+	   Set the voice detection factor.  Allowed range is from 2 to 32.
+	   Default value is 2.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   drmeter
+       Measure audio dynamic range.
+
+       DR values of 14 and higher is found in very dynamic material. DR of 8
+       to 13 is found in transition material. And anything less that 8 have
+       very poor dynamics and is very compressed.
+
+       The filter accepts the following options:
+
+       length
+	   Set window length in seconds used to split audio into segments of
+	   equal length.  Default is 3 seconds.
+
+   dynaudnorm
+       Dynamic Audio Normalizer.
+
+       This filter applies a certain amount of gain to the input audio in
+       order to bring its peak magnitude to a target level (e.g. 0 dBFS).
+       However, in contrast to more "simple" normalization algorithms, the
+       Dynamic Audio Normalizer *dynamically* re-adjusts the gain factor to
+       the input audio.  This allows for applying extra gain to the "quiet"
+       sections of the audio while avoiding distortions or clipping the "loud"
+       sections. In other words: The Dynamic Audio Normalizer will "even out"
+       the volume of quiet and loud sections, in the sense that the volume of
+       each section is brought to the same target level. Note, however, that
+       the Dynamic Audio Normalizer achieves this goal *without* applying
+       "dynamic range compressing". It will retain 100% of the dynamic range
+       *within* each section of the audio file.
+
+       framelen, f
+	   Set the frame length in milliseconds. In range from 10 to 8000
+	   milliseconds.  Default is 500 milliseconds.	The Dynamic Audio
+	   Normalizer processes the input audio in small chunks, referred to
+	   as frames. This is required, because a peak magnitude has no
+	   meaning for just a single sample value. Instead, we need to
+	   determine the peak magnitude for a contiguous sequence of sample
+	   values. While a "standard" normalizer would simply use the peak
+	   magnitude of the complete file, the Dynamic Audio Normalizer
+	   determines the peak magnitude individually for each frame. The
+	   length of a frame is specified in milliseconds. By default, the
+	   Dynamic Audio Normalizer uses a frame length of 500 milliseconds,
+	   which has been found to give good results with most files.  Note
+	   that the exact frame length, in number of samples, will be
+	   determined automatically, based on the sampling rate of the
+	   individual input audio file.
+
+       gausssize, g
+	   Set the Gaussian filter window size. In range from 3 to 301, must
+	   be odd number. Default is 31.  Probably the most important
+	   parameter of the Dynamic Audio Normalizer is the "window size" of
+	   the Gaussian smoothing filter. The filter's window size is
+	   specified in frames, centered around the current frame. For the
+	   sake of simplicity, this must be an odd number. Consequently, the
+	   default value of 31 takes into account the current frame, as well
+	   as the 15 preceding frames and the 15 subsequent frames. Using a
+	   larger window results in a stronger smoothing effect and thus in
+	   less gain variation, i.e. slower gain adaptation. Conversely, using
+	   a smaller window results in a weaker smoothing effect and thus in
+	   more gain variation, i.e. faster gain adaptation.  In other words,
+	   the more you increase this value, the more the Dynamic Audio
+	   Normalizer will behave like a "traditional" normalization filter.
+	   On the contrary, the more you decrease this value, the more the
+	   Dynamic Audio Normalizer will behave like a dynamic range
+	   compressor.
+
+       peak, p
+	   Set the target peak value. This specifies the highest permissible
+	   magnitude level for the normalized audio input. This filter will
+	   try to approach the target peak magnitude as closely as possible,
+	   but at the same time it also makes sure that the normalized signal
+	   will never exceed the peak magnitude.  A frame's maximum local gain
+	   factor is imposed directly by the target peak magnitude. The
+	   default value is 0.95 and thus leaves a headroom of 5%*.  It is not
+	   recommended to go above this value.
+
+       maxgain, m
+	   Set the maximum gain factor. In range from 1.0 to 100.0. Default is
+	   10.0.  The Dynamic Audio Normalizer determines the maximum possible
+	   (local) gain factor for each input frame, i.e. the maximum gain
+	   factor that does not result in clipping or distortion. The maximum
+	   gain factor is determined by the frame's highest magnitude sample.
+	   However, the Dynamic Audio Normalizer additionally bounds the
+	   frame's maximum gain factor by a predetermined (global) maximum
+	   gain factor. This is done in order to avoid excessive gain factors
+	   in "silent" or almost silent frames. By default, the maximum gain
+	   factor is 10.0, For most inputs the default value should be
+	   sufficient and it usually is not recommended to increase this
+	   value. Though, for input with an extremely low overall volume
+	   level, it may be necessary to allow even higher gain factors. Note,
+	   however, that the Dynamic Audio Normalizer does not simply apply a
+	   "hard" threshold (i.e. cut off values above the threshold).
+	   Instead, a "sigmoid" threshold function will be applied. This way,
+	   the gain factors will smoothly approach the threshold value, but
+	   never exceed that value.
+
+       targetrms, r
+	   Set the target RMS. In range from 0.0 to 1.0. Default is 0.0 -
+	   disabled.  By default, the Dynamic Audio Normalizer performs "peak"
+	   normalization.  This means that the maximum local gain factor for
+	   each frame is defined (only) by the frame's highest magnitude
+	   sample. This way, the samples can be amplified as much as possible
+	   without exceeding the maximum signal level, i.e. without clipping.
+	   Optionally, however, the Dynamic Audio Normalizer can also take
+	   into account the frame's root mean square, abbreviated RMS. In
+	   electrical engineering, the RMS is commonly used to determine the
+	   power of a time-varying signal. It is therefore considered that the
+	   RMS is a better approximation of the "perceived loudness" than just
+	   looking at the signal's peak magnitude. Consequently, by adjusting
+	   all frames to a constant RMS value, a uniform "perceived loudness"
+	   can be established. If a target RMS value has been specified, a
+	   frame's local gain factor is defined as the factor that would
+	   result in exactly that RMS value.  Note, however, that the maximum
+	   local gain factor is still restricted by the frame's highest
+	   magnitude sample, in order to prevent clipping.
+
+       coupling, n
+	   Enable channels coupling. By default is enabled.  By default, the
+	   Dynamic Audio Normalizer will amplify all channels by the same
+	   amount. This means the same gain factor will be applied to all
+	   channels, i.e.  the maximum possible gain factor is determined by
+	   the "loudest" channel.  However, in some recordings, it may happen
+	   that the volume of the different channels is uneven, e.g. one
+	   channel may be "quieter" than the other one(s).  In this case, this
+	   option can be used to disable the channel coupling. This way, the
+	   gain factor will be determined independently for each channel,
+	   depending only on the individual channel's highest magnitude
+	   sample. This allows for harmonizing the volume of the different
+	   channels.
+
+       correctdc, c
+	   Enable DC bias correction. By default is disabled.  An audio signal
+	   (in the time domain) is a sequence of sample values.  In the
+	   Dynamic Audio Normalizer these sample values are represented in the
+	   -1.0 to 1.0 range, regardless of the original input format.
+	   Normally, the audio signal, or "waveform", should be centered
+	   around the zero point.  That means if we calculate the mean value
+	   of all samples in a file, or in a single frame, then the result
+	   should be 0.0 or at least very close to that value. If, however,
+	   there is a significant deviation of the mean value from 0.0, in
+	   either positive or negative direction, this is referred to as a DC
+	   bias or DC offset. Since a DC bias is clearly undesirable, the
+	   Dynamic Audio Normalizer provides optional DC bias correction.
+	   With DC bias correction enabled, the Dynamic Audio Normalizer will
+	   determine the mean value, or "DC correction" offset, of each input
+	   frame and subtract that value from all of the frame's sample values
+	   which ensures those samples are centered around 0.0 again. Also, in
+	   order to avoid "gaps" at the frame boundaries, the DC correction
+	   offset values will be interpolated smoothly between neighbouring
+	   frames.
+
+       altboundary, b
+	   Enable alternative boundary mode. By default is disabled.  The
+	   Dynamic Audio Normalizer takes into account a certain neighbourhood
+	   around each frame. This includes the preceding frames as well as
+	   the subsequent frames. However, for the "boundary" frames, located
+	   at the very beginning and at the very end of the audio file, not
+	   all neighbouring frames are available. In particular, for the first
+	   few frames in the audio file, the preceding frames are not known.
+	   And, similarly, for the last few frames in the audio file, the
+	   subsequent frames are not known. Thus, the question arises which
+	   gain factors should be assumed for the missing frames in the
+	   "boundary" region. The Dynamic Audio Normalizer implements two
+	   modes to deal with this situation. The default boundary mode
+	   assumes a gain factor of exactly 1.0 for the missing frames,
+	   resulting in a smooth "fade in" and "fade out" at the beginning and
+	   at the end of the input, respectively.
+
+       compress, s
+	   Set the compress factor. In range from 0.0 to 30.0. Default is 0.0.
+	   By default, the Dynamic Audio Normalizer does not apply
+	   "traditional" compression. This means that signal peaks will not be
+	   pruned and thus the full dynamic range will be retained within each
+	   local neighbourhood. However, in some cases it may be desirable to
+	   combine the Dynamic Audio Normalizer's normalization algorithm with
+	   a more "traditional" compression.  For this purpose, the Dynamic
+	   Audio Normalizer provides an optional compression (thresholding)
+	   function. If (and only if) the compression feature is enabled, all
+	   input frames will be processed by a soft knee thresholding function
+	   prior to the actual normalization process. Put simply, the
+	   thresholding function is going to prune all samples whose magnitude
+	   exceeds a certain threshold value.  However, the Dynamic Audio
+	   Normalizer does not simply apply a fixed threshold value. Instead,
+	   the threshold value will be adjusted for each individual frame.  In
+	   general, smaller parameters result in stronger compression, and
+	   vice versa.	Values below 3.0 are not recommended, because audible
+	   distortion may appear.
+
+       threshold, t
+	   Set the target threshold value. This specifies the lowest
+	   permissible magnitude level for the audio input which will be
+	   normalized.	If input frame volume is above this value frame will
+	   be normalized.  Otherwise frame may not be normalized at all. The
+	   default value is set to 0, which means all input frames will be
+	   normalized.	This option is mostly useful if digital noise is not
+	   wanted to be amplified.
+
+       channels, h
+	   Specify which channels to filter, by default all available channels
+	   are filtered.
+
+       overlap, o
+	   Specify overlap for frames. If set to 0 (default) no frame
+	   overlapping is done.  Using >0 and <1 values will make less
+	   conservative gain adjustments, like when framelen option is set to
+	   smaller value, if framelen option value is compensated for non-zero
+	   overlap then gain adjustments will be smoother across time compared
+	   to zero overlap case.
+
+       curve, v
+	   Specify the peak mapping curve expression which is going to be used
+	   when calculating gain applied to frames. The max output frame gain
+	   will still be limited by other options mentioned previously for
+	   this filter.
+
+	   The expression can contain the following constants:
+
+	   ch  current channel number
+
+	   sn  current sample number
+
+	   nb_channels
+	       number of channels
+
+	   t   timestamp expressed in seconds
+
+	   sr  sample rate
+
+	   p   current frame peak value
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   earwax
+       Make audio easier to listen to on headphones.
+
+       This filter adds `cues' to 44.1kHz stereo (i.e. audio CD format) audio
+       so that when listened to on headphones the stereo image is moved from
+       inside your head (standard for headphones) to outside and in front of
+       the listener (standard for speakers).
+
+       Ported from SoX.
+
+   equalizer
+       Apply a two-pole peaking equalisation (EQ) filter. With this filter,
+       the signal-level at and around a selected frequency can be increased or
+       decreased, whilst (unlike bandpass and bandreject filters) that at all
+       other frequencies is unchanged.
+
+       In order to produce complex equalisation curves, this filter can be
+       given several times, each with a different central frequency.
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the filter's central frequency in Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.
+
+       gain, g
+	   Set the required gain or attenuation in dB.	Beware of clipping
+	   when using a positive gain.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Examples
+
+       o   Attenuate 10 dB at 1000 Hz, with a bandwidth of 200 Hz:
+
+		   equalizer=f=1000:t=h:width=200:g=-10
+
+       o   Apply 2 dB gain at 1000 Hz with Q 1 and attenuate 5 dB at 100 Hz
+	   with Q 2:
+
+		   equalizer=f=1000:t=q:w=1:g=2,equalizer=f=100:t=q:w=2:g=-5
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change equalizer frequency.	Syntax for the command is :
+	   "frequency"
+
+       width_type, t
+	   Change equalizer width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change equalizer width.  Syntax for the command is : "width"
+
+       gain, g
+	   Change equalizer gain.  Syntax for the command is : "gain"
+
+       mix, m
+	   Change equalizer mix.  Syntax for the command is : "mix"
+
+   extrastereo
+       Linearly increases the difference between left and right channels which
+       adds some sort of "live" effect to playback.
+
+       The filter accepts the following options:
+
+       m   Sets the difference coefficient (default: 2.5). 0.0 means mono
+	   sound (average of both channels), with 1.0 sound will be unchanged,
+	   with -1.0 left and right channels will be swapped.
+
+       c   Enable clipping. By default is enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   firequalizer
+       Apply FIR Equalization using arbitrary frequency response.
+
+       The filter accepts the following option:
+
+       gain
+	   Set gain curve equation (in dB). The expression can contain
+	   variables:
+
+	   f   the evaluated frequency
+
+	   sr  sample rate
+
+	   ch  channel number, set to 0 when multichannels evaluation is
+	       disabled
+
+	   chid
+	       channel id, see libavutil/channel_layout.h, set to the first
+	       channel id when multichannels evaluation is disabled
+
+	   chs number of channels
+
+	   chlayout
+	       channel_layout, see libavutil/channel_layout.h
+
+	   and functions:
+
+	   gain_interpolate(f)
+	       interpolate gain on frequency f based on gain_entry
+
+	   cubic_interpolate(f)
+	       same as gain_interpolate, but smoother
+
+	   This option is also available as command. Default is
+	   gain_interpolate(f).
+
+       gain_entry
+	   Set gain entry for gain_interpolate function. The expression can
+	   contain functions:
+
+	   entry(f, g)
+	       store gain entry at frequency f with value g
+
+	   This option is also available as command.
+
+       delay
+	   Set filter delay in seconds. Higher value means more accurate.
+	   Default is 0.01.
+
+       accuracy
+	   Set filter accuracy in Hz. Lower value means more accurate.
+	   Default is 5.
+
+       wfunc
+	   Set window function. Acceptable values are:
+
+	   rectangular
+	       rectangular window, useful when gain curve is already smooth
+
+	   hann
+	       hann window (default)
+
+	   hamming
+	       hamming window
+
+	   blackman
+	       blackman window
+
+	   nuttall3
+	       3-terms continuous 1st derivative nuttall window
+
+	   mnuttall3
+	       minimum 3-terms discontinuous nuttall window
+
+	   nuttall
+	       4-terms continuous 1st derivative nuttall window
+
+	   bnuttall
+	       minimum 4-terms discontinuous nuttall (blackman-nuttall) window
+
+	   bharris
+	       blackman-harris window
+
+	   tukey
+	       tukey window
+
+       fixed
+	   If enabled, use fixed number of audio samples. This improves speed
+	   when filtering with large delay. Default is disabled.
+
+       multi
+	   Enable multichannels evaluation on gain. Default is disabled.
+
+       zero_phase
+	   Enable zero phase mode by subtracting timestamp to compensate
+	   delay.  Default is disabled.
+
+       scale
+	   Set scale used by gain. Acceptable values are:
+
+	   linlin
+	       linear frequency, linear gain
+
+	   linlog
+	       linear frequency, logarithmic (in dB) gain (default)
+
+	   loglin
+	       logarithmic (in octave scale where 20 Hz is 0) frequency,
+	       linear gain
+
+	   loglog
+	       logarithmic frequency, logarithmic gain
+
+       dumpfile
+	   Set file for dumping, suitable for gnuplot.
+
+       dumpscale
+	   Set scale for dumpfile. Acceptable values are same with scale
+	   option.  Default is linlog.
+
+       fft2
+	   Enable 2-channel convolution using complex FFT. This improves speed
+	   significantly.  Default is disabled.
+
+       min_phase
+	   Enable minimum phase impulse response. Default is disabled.
+
+       Examples
+
+       o   lowpass at 1000 Hz:
+
+		   firequalizer=gain='if(lt(f,1000), 0, -INF)'
+
+       o   lowpass at 1000 Hz with gain_entry:
+
+		   firequalizer=gain_entry='entry(1000,0); entry(1001, -INF)'
+
+       o   custom equalization:
+
+		   firequalizer=gain_entry='entry(100,0); entry(400, -4); entry(1000, -6); entry(2000, 0)'
+
+       o   higher delay with zero phase to compensate delay:
+
+		   firequalizer=delay=0.1:fixed=on:zero_phase=on
+
+       o   lowpass on left channel, highpass on right channel:
+
+		   firequalizer=gain='if(eq(chid,1), gain_interpolate(f), if(eq(chid,2), gain_interpolate(1e6+f), 0))'
+		   :gain_entry='entry(1000, 0); entry(1001,-INF); entry(1e6+1000,0)':multi=on
+
+   flanger
+       Apply a flanging effect to the audio.
+
+       The filter accepts the following options:
+
+       delay
+	   Set base delay in milliseconds. Range from 0 to 30. Default value
+	   is 0.
+
+       depth
+	   Set added sweep delay in milliseconds. Range from 0 to 10. Default
+	   value is 2.
+
+       regen
+	   Set percentage regeneration (delayed signal feedback). Range from
+	   -95 to 95.  Default value is 0.
+
+       width
+	   Set percentage of delayed signal mixed with original. Range from 0
+	   to 100.  Default value is 71.
+
+       speed
+	   Set sweeps per second (Hz). Range from 0.1 to 10. Default value is
+	   0.5.
+
+       shape
+	   Set swept wave shape, can be triangular or sinusoidal.  Default
+	   value is sinusoidal.
+
+       phase
+	   Set swept wave percentage-shift for multi channel. Range from 0 to
+	   100.  Default value is 25.
+
+       interp
+	   Set delay-line interpolation, linear or quadratic.  Default is
+	   linear.
+
+   haas
+       Apply Haas effect to audio.
+
+       Note that this makes most sense to apply on mono signals.  With this
+       filter applied to mono signals it give some directionality and
+       stretches its stereo image.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level. By default is 1, or 0dB
+
+       level_out
+	   Set output level. By default is 1, or 0dB.
+
+       side_gain
+	   Set gain applied to side part of signal. By default is 1.
+
+       middle_source
+	   Set kind of middle source. Can be one of the following:
+
+	   left
+	       Pick left channel.
+
+	   right
+	       Pick right channel.
+
+	   mid Pick middle part signal of stereo image.
+
+	   side
+	       Pick side part signal of stereo image.
+
+       middle_phase
+	   Change middle phase. By default is disabled.
+
+       left_delay
+	   Set left channel delay. By default is 2.05 milliseconds.
+
+       left_balance
+	   Set left channel balance. By default is -1.
+
+       left_gain
+	   Set left channel gain. By default is 1.
+
+       left_phase
+	   Change left phase. By default is disabled.
+
+       right_delay
+	   Set right channel delay. By defaults is 2.12 milliseconds.
+
+       right_balance
+	   Set right channel balance. By default is 1.
+
+       right_gain
+	   Set right channel gain. By default is 1.
+
+       right_phase
+	   Change right phase. By default is enabled.
+
+   hdcd
+       Decodes High Definition Compatible Digital (HDCD) data. A 16-bit PCM
+       stream with embedded HDCD codes is expanded into a 20-bit PCM stream.
+
+       The filter supports the Peak Extend and Low-level Gain Adjustment
+       features of HDCD, and detects the Transient Filter flag.
+
+	       ffmpeg -i HDCD16.flac -af hdcd OUT24.flac
+
+       When using the filter with wav, note the default encoding for wav is
+       16-bit, so the resulting 20-bit stream will be truncated back to
+       16-bit. Use something like -acodec pcm_s24le after the filter to get
+       24-bit PCM output.
+
+	       ffmpeg -i HDCD16.wav -af hdcd OUT16.wav
+	       ffmpeg -i HDCD16.wav -af hdcd -c:a pcm_s24le OUT24.wav
+
+       The filter accepts the following options:
+
+       disable_autoconvert
+	   Disable any automatic format conversion or resampling in the filter
+	   graph.
+
+       process_stereo
+	   Process the stereo channels together. If target_gain does not match
+	   between channels, consider it invalid and use the last valid
+	   target_gain.
+
+       cdt_ms
+	   Set the code detect timer period in ms.
+
+       force_pe
+	   Always extend peaks above -3dBFS even if PE isn't signaled.
+
+       analyze_mode
+	   Replace audio with a solid tone and adjust the amplitude to signal
+	   some specific aspect of the decoding process. The output file can
+	   be loaded in an audio editor alongside the original to aid
+	   analysis.
+
+	   "analyze_mode=pe:force_pe=true" can be used to see all samples
+	   above the PE level.
+
+	   Modes are:
+
+	   0, off
+	       Disabled
+
+	   1, lle
+	       Gain adjustment level at each sample
+
+	   2, pe
+	       Samples where peak extend occurs
+
+	   3, cdt
+	       Samples where the code detect timer is active
+
+	   4, tgm
+	       Samples where the target gain does not match between channels
+
+   headphone
+       Apply head-related transfer functions (HRTFs) to create virtual
+       loudspeakers around the user for binaural listening via headphones.
+       The HRIRs are provided via additional streams, for each channel one
+       stereo input stream is needed.
+
+       The filter accepts the following options:
+
+       map Set mapping of input streams for convolution.  The argument is a
+	   '|'-separated list of channel names in order as they are given as
+	   additional stream inputs for filter.  This also specify number of
+	   input streams. Number of input streams must be not less than number
+	   of channels in first stream plus one.
+
+       gain
+	   Set gain applied to audio. Value is in dB. Default is 0.
+
+       type
+	   Set processing type. Can be time or freq. time is processing audio
+	   in time domain which is slow.  freq is processing audio in
+	   frequency domain which is fast.  Default is freq.
+
+       lfe Set custom gain for LFE channels. Value is in dB. Default is 0.
+
+       size
+	   Set size of frame in number of samples which will be processed at
+	   once.  Default value is 1024. Allowed range is from 1024 to 96000.
+
+       hrir
+	   Set format of hrir stream.  Default value is stereo. Alternative
+	   value is multich.  If value is set to stereo, number of additional
+	   streams should be greater or equal to number of input channels in
+	   first input stream.	Also each additional stream should have stereo
+	   number of channels.	If value is set to multich, number of
+	   additional streams should be exactly one. Also number of input
+	   channels of additional stream should be equal or greater than twice
+	   number of channels of first input stream.
+
+       Examples
+
+       o   Full example using wav files as coefficients with amovie filters
+	   for 7.1 downmix, each amovie filter use stereo file with IR
+	   coefficients as input.  The files give coefficients for each
+	   position of virtual loudspeaker:
+
+		   ffmpeg -i input.wav
+		   -filter_complex "amovie=azi_270_ele_0_DFC.wav[sr];amovie=azi_90_ele_0_DFC.wav[sl];amovie=azi_225_ele_0_DFC.wav[br];amovie=azi_135_ele_0_DFC.wav[bl];amovie=azi_0_ele_0_DFC.wav,asplit[fc][lfe];amovie=azi_35_ele_0_DFC.wav[fl];amovie=azi_325_ele_0_DFC.wav[fr];[0:a][fl][fr][fc][lfe][bl][br][sl][sr]headphone=FL|FR|FC|LFE|BL|BR|SL|SR"
+		   output.wav
+
+       o   Full example using wav files as coefficients with amovie filters
+	   for 7.1 downmix, but now in multich hrir format.
+
+		   ffmpeg -i input.wav -filter_complex "amovie=minp.wav[hrirs];[0:a][hrirs]headphone=map=FL|FR|FC|LFE|BL|BR|SL|SR:hrir=multich"
+		   output.wav
+
+   highpass
+       Apply a high-pass filter with 3dB point frequency.  The filter can be
+       either single-pole, or double-pole (the default).  The filter roll off
+       at 6dB per pole per octave (20dB per pole per decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set frequency in Hz. Default is 3000.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.  Applies
+	   only to double-pole filter.	The default is 0.707q and gives a
+	   Butterworth response.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change highpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change highpass width_type.	Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change highpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change highpass mix.  Syntax for the command is : "mix"
+
+   join
+       Join multiple input streams into one multi-channel stream.
+
+       It accepts the following parameters:
+
+       inputs
+	   The number of input streams. It defaults to 2.
+
+       channel_layout
+	   The desired output channel layout. It defaults to stereo.
+
+       map Map channels from inputs to output. The argument is a '|'-separated
+	   list of mappings, each in the "input_idx.in_channel-out_channel"
+	   form. input_idx is the 0-based index of the input stream.
+	   in_channel can be either the name of the input channel (e.g. FL for
+	   front left) or its index in the specified input stream. out_channel
+	   is the name of the output channel.
+
+       The filter will attempt to guess the mappings when they are not
+       specified explicitly. It does so by first trying to find an unused
+       matching input channel and if that fails it picks the first unused
+       input channel.
+
+       Join 3 inputs (with properly set channel layouts):
+
+	       ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex join=inputs=3 OUTPUT
+
+       Build a 5.1 output from 6 single-channel streams:
+
+	       ffmpeg -i fl -i fr -i fc -i sl -i sr -i lfe -filter_complex
+	       'join=inputs=6:channel_layout=5.1:map=0.0-FL|1.0-FR|2.0-FC|3.0-SL|4.0-SR|5.0-LFE'
+	       out
+
+   ladspa
+       Load a LADSPA (Linux Audio Developer's Simple Plugin API) plugin.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-ladspa".
+
+       file, f
+	   Specifies the name of LADSPA plugin library to load. If the
+	   environment variable LADSPA_PATH is defined, the LADSPA plugin is
+	   searched in each one of the directories specified by the colon
+	   separated list in LADSPA_PATH, otherwise in the standard LADSPA
+	   paths, which are in this order: HOME/.ladspa/lib/,
+	   /usr/local/lib/ladspa/, /usr/lib/ladspa/.
+
+       plugin, p
+	   Specifies the plugin within the library. Some libraries contain
+	   only one plugin, but others contain many of them. If this is not
+	   set filter will list all available plugins within the specified
+	   library.
+
+       controls, c
+	   Set the '|' separated list of controls which are zero or more
+	   floating point values that determine the behavior of the loaded
+	   plugin (for example delay, threshold or gain).  Controls need to be
+	   defined using the following syntax:
+	   c0=value0|c1=value1|c2=value2|..., where valuei is the value set on
+	   the i-th control.  Alternatively they can be also defined using the
+	   following syntax: value0|value1|value2|..., where valuei is the
+	   value set on the i-th control.  If controls is set to "help", all
+	   available controls and their valid ranges are printed.
+
+       sample_rate, s
+	   Specify the sample rate, default to 44100. Only used if plugin have
+	   zero inputs.
+
+       nb_samples, n
+	   Set the number of samples per channel per each output frame,
+	   default is 1024. Only used if plugin have zero inputs.
+
+       duration, d
+	   Set the minimum duration of the sourced audio. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  Note that the resulting duration may be greater than the
+	   specified duration, as the generated audio is always cut at the end
+	   of a complete frame.  If not specified, or the expressed duration
+	   is negative, the audio is supposed to be generated forever.	Only
+	   used if plugin have zero inputs.
+
+       latency, l
+	   Enable latency compensation, by default is disabled.  Only used if
+	   plugin have inputs.
+
+       Examples
+
+       o   List all available plugins within amp (LADSPA example plugin)
+	   library:
+
+		   ladspa=file=amp
+
+       o   List all available controls and their valid ranges for "vcf_notch"
+	   plugin from "VCF" library:
+
+		   ladspa=f=vcf:p=vcf_notch:c=help
+
+       o   Simulate low quality audio equipment using "Computer Music Toolkit"
+	   (CMT) plugin library:
+
+		   ladspa=file=cmt:plugin=lofi:controls=c0=22|c1=12|c2=12
+
+       o   Add reverberation to the audio using TAP-plugins (Tom's Audio
+	   Processing plugins):
+
+		   ladspa=file=tap_reverb:tap_reverb
+
+       o   Generate white noise, with 0.2 amplitude:
+
+		   ladspa=file=cmt:noise_source_white:c=c0=.2
+
+       o   Generate 20 bpm clicks using plugin "C* Click - Metronome" from the
+	   "C* Audio Plugin Suite" (CAPS) library:
+
+		   ladspa=file=caps:Click:c=c1=20'
+
+       o   Apply "C* Eq10X2 - Stereo 10-band equaliser" effect:
+
+		   ladspa=caps:Eq10X2:c=c0=-48|c9=-24|c3=12|c4=2
+
+       o   Increase volume by 20dB using fast lookahead limiter from Steve
+	   Harris "SWH Plugins" collection:
+
+		   ladspa=fast_lookahead_limiter_1913:fastLookaheadLimiter:20|0|2
+
+       o   Attenuate low frequencies using Multiband EQ from Steve Harris "SWH
+	   Plugins" collection:
+
+		   ladspa=mbeq_1197:mbeq:-24|-24|-24|0|0|0|0|0|0|0|0|0|0|0|0
+
+       o   Reduce stereo image using "Narrower" from the "C* Audio Plugin
+	   Suite" (CAPS) library:
+
+		   ladspa=caps:Narrower
+
+       o   Another white noise, now using "C* Audio Plugin Suite" (CAPS)
+	   library:
+
+		   ladspa=caps:White:.2
+
+       o   Some fractal noise, using "C* Audio Plugin Suite" (CAPS) library:
+
+		   ladspa=caps:Fractal:c=c1=1
+
+       o   Dynamic volume normalization using "VLevel" plugin:
+
+		   ladspa=vlevel-ladspa:vlevel_mono
+
+       Commands
+
+       This filter supports the following commands:
+
+       cN  Modify the N-th control value.
+
+	   If the specified value is not valid, it is ignored and prior one is
+	   kept.
+
+   loudnorm
+       EBU R128 loudness normalization. Includes both dynamic and linear
+       normalization modes.  Support for both single pass (livestreams, files)
+       and double pass (files) modes.  This algorithm can target IL, LRA, and
+       maximum true peak. In dynamic mode, to accurately detect true peaks,
+       the audio stream will be upsampled to 192 kHz.  Use the "-ar" option or
+       "aresample" filter to explicitly set an output sample rate.
+
+       The filter accepts the following options:
+
+       I, i
+	   Set integrated loudness target.  Range is -70.0 - -5.0. Default
+	   value is -24.0.
+
+       LRA, lra
+	   Set loudness range target.  Range is 1.0 - 50.0. Default value is
+	   7.0.
+
+       TP, tp
+	   Set maximum true peak.  Range is -9.0 - +0.0. Default value is
+	   -2.0.
+
+       measured_I, measured_i
+	   Measured IL of input file.  Range is -99.0 - +0.0.
+
+       measured_LRA, measured_lra
+	   Measured LRA of input file.	Range is  0.0 - 99.0.
+
+       measured_TP, measured_tp
+	   Measured true peak of input file.  Range is	-99.0 - +99.0.
+
+       measured_thresh
+	   Measured threshold of input file.  Range is -99.0 - +0.0.
+
+       offset
+	   Set offset gain. Gain is applied before the true-peak limiter.
+	   Range is  -99.0 - +99.0. Default is +0.0.
+
+       linear
+	   Normalize by linearly scaling the source audio.  "measured_I",
+	   "measured_LRA", "measured_TP", and "measured_thresh" must all be
+	   specified. Target LRA shouldn't be lower than source LRA and the
+	   change in integrated loudness shouldn't result in a true peak which
+	   exceeds the target TP. If any of these conditions aren't met,
+	   normalization mode will revert to dynamic.  Options are "true" or
+	   "false". Default is "true".
+
+       dual_mono
+	   Treat mono input files as "dual-mono". If a mono file is intended
+	   for playback on a stereo system, its EBU R128 measurement will be
+	   perceptually incorrect.  If set to "true", this option will
+	   compensate for this effect.	Multi-channel input files are not
+	   affected by this option.  Options are true or false. Default is
+	   false.
+
+       print_format
+	   Set print format for stats. Options are summary, json, or none.
+	   Default value is none.
+
+   lowpass
+       Apply a low-pass filter with 3dB point frequency.  The filter can be
+       either single-pole or double-pole (the default).  The filter roll off
+       at 6dB per pole per octave (20dB per pole per decade).
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set frequency in Hz. Default is 500.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Specify the band-width of a filter in width_type units.  Applies
+	   only to double-pole filter.	The default is 0.707q and gives a
+	   Butterworth response.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Examples
+
+       o   Lowpass only LFE channel, it LFE is not present it does nothing:
+
+		   lowpass=c=LFE
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change lowpass frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change lowpass width_type.  Syntax for the command is :
+	   "width_type"
+
+       width, w
+	   Change lowpass width.  Syntax for the command is : "width"
+
+       mix, m
+	   Change lowpass mix.	Syntax for the command is : "mix"
+
+   lv2
+       Load a LV2 (LADSPA Version 2) plugin.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-lv2".
+
+       plugin, p
+	   Specifies the plugin URI. You may need to escape ':'.
+
+       controls, c
+	   Set the '|' separated list of controls which are zero or more
+	   floating point values that determine the behavior of the loaded
+	   plugin (for example delay, threshold or gain).  If controls is set
+	   to "help", all available controls and their valid ranges are
+	   printed.
+
+       sample_rate, s
+	   Specify the sample rate, default to 44100. Only used if plugin have
+	   zero inputs.
+
+       nb_samples, n
+	   Set the number of samples per channel per each output frame,
+	   default is 1024. Only used if plugin have zero inputs.
+
+       duration, d
+	   Set the minimum duration of the sourced audio. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  Note that the resulting duration may be greater than the
+	   specified duration, as the generated audio is always cut at the end
+	   of a complete frame.  If not specified, or the expressed duration
+	   is negative, the audio is supposed to be generated forever.	Only
+	   used if plugin have zero inputs.
+
+       Examples
+
+       o   Apply bass enhancer plugin from Calf:
+
+		   lv2=p=http\\\\://calf.sourceforge.net/plugins/BassEnhancer:c=amount=2
+
+       o   Apply vinyl plugin from Calf:
+
+		   lv2=p=http\\\\://calf.sourceforge.net/plugins/Vinyl:c=drone=0.2|aging=0.5
+
+       o   Apply bit crusher plugin from ArtyFX:
+
+		   lv2=p=http\\\\://www.openavproductions.com/artyfx#bitta:c=crush=0.3
+
+       Commands
+
+       This filter supports all options that are exported by plugin as
+       commands.
+
+   mcompand
+       Multiband Compress or expand the audio's dynamic range.
+
+       The input audio is divided into bands using 4th order Linkwitz-Riley
+       IIRs.  This is akin to the crossover of a loudspeaker, and results in
+       flat frequency response when absent compander action.
+
+       It accepts the following parameters:
+
+       args
+	   This option syntax is: attack,decay,[attack,decay..] soft-knee
+	   points crossover_frequency [delay [initial_volume [gain]]] |
+	   attack,decay ...  For explanation of each item refer to compand
+	   filter documentation.
+
+   pan
+       Mix channels with specific gain levels. The filter accepts the output
+       channel layout followed by a set of channels definitions.
+
+       This filter is also designed to efficiently remap the channels of an
+       audio stream.
+
+       The filter accepts parameters of the form: "l|outdef|outdef|..."
+
+       l   output channel layout or number of channels
+
+       outdef
+	   output channel specification, of the form:
+	   "out_name=[gain*]in_name[(+-)[gain*]in_name...]"
+
+       out_name
+	   output channel to define, either a channel name (FL, FR, etc.) or a
+	   channel number (c0, c1, etc.)
+
+       gain
+	   multiplicative coefficient for the channel, 1 leaving the volume
+	   unchanged
+
+       in_name
+	   input channel to use, see out_name for details; it is not possible
+	   to mix named and numbered input channels
+
+       If the `=' in a channel specification is replaced by `<', then the
+       gains for that specification will be renormalized so that the total is
+       1, thus avoiding clipping noise.
+
+       Mixing examples
+
+       For example, if you want to down-mix from stereo to mono, but with a
+       bigger factor for the left channel:
+
+	       pan=1c|c0=0.9*c0+0.1*c1
+
+       A customized down-mix to stereo that works automatically for 3-, 4-, 5-
+       and 7-channels surround:
+
+	       pan=stereo| FL < FL + 0.5*FC + 0.6*BL + 0.6*SL | FR < FR + 0.5*FC + 0.6*BR + 0.6*SR
+
+       Note that ffmpeg integrates a default down-mix (and up-mix) system that
+       should be preferred (see "-ac" option) unless you have very specific
+       needs.
+
+       Remapping examples
+
+       The channel remapping will be effective if, and only if:
+
+       *<gain coefficients are zeroes or ones,>
+       *<only one input per channel output,>
+
+       If all these conditions are satisfied, the filter will notify the user
+       ("Pure channel mapping detected"), and use an optimized and lossless
+       method to do the remapping.
+
+       For example, if you have a 5.1 source and want a stereo audio stream by
+       dropping the extra channels:
+
+	       pan="stereo| c0=FL | c1=FR"
+
+       Given the same source, you can also switch front left and front right
+       channels and keep the input channel layout:
+
+	       pan="5.1| c0=c1 | c1=c0 | c2=c2 | c3=c3 | c4=c4 | c5=c5"
+
+       If the input is a stereo audio stream, you can mute the front left
+       channel (and still keep the stereo channel layout) with:
+
+	       pan="stereo|c1=c1"
+
+       Still with a stereo audio stream input, you can copy the right channel
+       in both front left and right:
+
+	       pan="stereo| c0=FR | c1=FR"
+
+   replaygain
+       ReplayGain scanner filter. This filter takes an audio stream as an
+       input and outputs it unchanged.	At end of filtering it displays
+       "track_gain" and "track_peak".
+
+       The filter accepts the following exported read-only options:
+
+       track_gain
+	   Exported track gain in dB at end of stream.
+
+       track_peak
+	   Exported track peak at end of stream.
+
+   resample
+       Convert the audio sample format, sample rate and channel layout. It is
+       not meant to be used directly.
+
+   rubberband
+       Apply time-stretching and pitch-shifting with librubberband.
+
+       To enable compilation of this filter, you need to configure FFmpeg with
+       "--enable-librubberband".
+
+       The filter accepts the following options:
+
+       tempo
+	   Set tempo scale factor.
+
+       pitch
+	   Set pitch scale factor.
+
+       transients
+	   Set transients detector.  Possible values are:
+
+	   crisp
+	   mixed
+	   smooth
+       detector
+	   Set detector.  Possible values are:
+
+	   compound
+	   percussive
+	   soft
+       phase
+	   Set phase.  Possible values are:
+
+	   laminar
+	   independent
+       window
+	   Set processing window size.	Possible values are:
+
+	   standard
+	   short
+	   long
+       smoothing
+	   Set smoothing.  Possible values are:
+
+	   off
+	   on
+       formant
+	   Enable formant preservation when shift pitching.  Possible values
+	   are:
+
+	   shifted
+	   preserved
+       pitchq
+	   Set pitch quality.  Possible values are:
+
+	   quality
+	   speed
+	   consistency
+       channels
+	   Set channels.  Possible values are:
+
+	   apart
+	   together
+
+       Commands
+
+       This filter supports the following commands:
+
+       tempo
+	   Change filter tempo scale factor.  Syntax for the command is :
+	   "tempo"
+
+       pitch
+	   Change filter pitch scale factor.  Syntax for the command is :
+	   "pitch"
+
+   sidechaincompress
+       This filter acts like normal compressor but has the ability to compress
+       detected signal using second input signal.  It needs two input streams
+       and returns one output stream.  First input stream will be processed
+       depending on second stream signal.  The filtered signal then can be
+       filtered with other filters in later stages of processing. See pan and
+       amerge filter.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input gain. Default is 1. Range is between 0.015625 and 64.
+
+       mode
+	   Set mode of compressor operation. Can be "upward" or "downward".
+	   Default is "downward".
+
+       threshold
+	   If a signal of second stream raises above this level it will affect
+	   the gain reduction of first stream.	By default is 0.125. Range is
+	   between 0.00097563 and 1.
+
+       ratio
+	   Set a ratio about which the signal is reduced. 1:2 means that if
+	   the level raised 4dB above the threshold, it will be only 2dB above
+	   after the reduction.  Default is 2. Range is between 1 and 20.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction starts. Default is 20. Range is between 0.01
+	   and 2000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before reduction is decreased again. Default is 250. Range is
+	   between 0.01 and 9000.
+
+       makeup
+	   Set the amount by how much signal will be amplified after
+	   processing.	Default is 1. Range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.82843. Range is between 1 and 8.
+
+       link
+	   Choose if the "average" level between all channels of side-chain
+	   stream or the louder("maximum") channel of side-chain stream
+	   affects the reduction. Default is "average".
+
+       detection
+	   Should the exact signal be taken in case of "peak" or an RMS one in
+	   case of "rms". Default is "rms" which is mainly smoother.
+
+       level_sc
+	   Set sidechain gain. Default is 1. Range is between 0.015625 and 64.
+
+       mix How much to use compressed signal in output. Default is 1.  Range
+	   is between 0 and 1.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Full ffmpeg example taking 2 audio inputs, 1st input to be
+	   compressed depending on the signal of 2nd input and later
+	   compressed signal to be merged with 2nd input:
+
+		   ffmpeg -i main.flac -i sidechain.flac -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress[compr];[compr][mix]amerge"
+
+   sidechaingate
+       A sidechain gate acts like a normal (wideband) gate but has the ability
+       to filter the detected signal before sending it to the gain reduction
+       stage.  Normally a gate uses the full range signal to detect a level
+       above the threshold.  For example: If you cut all lower frequencies
+       from your sidechain signal the gate will decrease the volume of your
+       track only if not enough highs appear. With this technique you are able
+       to reduce the resonation of a natural drum or remove "rumbling" of
+       muted strokes from a heavily distorted guitar.  It needs two input
+       streams and returns one output stream.  First input stream will be
+       processed depending on second stream signal.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level before filtering.  Default is 1. Allowed range is
+	   from 0.015625 to 64.
+
+       mode
+	   Set the mode of operation. Can be "upward" or "downward".  Default
+	   is "downward". If set to "upward" mode, higher parts of signal will
+	   be amplified, expanding dynamic range in upward direction.
+	   Otherwise, in case of "downward" lower parts of signal will be
+	   reduced.
+
+       range
+	   Set the level of gain reduction when the signal is below the
+	   threshold.  Default is 0.06125. Allowed range is from 0 to 1.
+	   Setting this to 0 disables reduction and then filter behaves like
+	   expander.
+
+       threshold
+	   If a signal rises above this level the gain reduction is released.
+	   Default is 0.125. Allowed range is from 0 to 1.
+
+       ratio
+	   Set a ratio about which the signal is reduced.  Default is 2.
+	   Allowed range is from 1 to 9000.
+
+       attack
+	   Amount of milliseconds the signal has to rise above the threshold
+	   before gain reduction stops.  Default is 20 milliseconds. Allowed
+	   range is from 0.01 to 9000.
+
+       release
+	   Amount of milliseconds the signal has to fall below the threshold
+	   before the reduction is increased again. Default is 250
+	   milliseconds.  Allowed range is from 0.01 to 9000.
+
+       makeup
+	   Set amount of amplification of signal after processing.  Default is
+	   1. Allowed range is from 1 to 64.
+
+       knee
+	   Curve the sharp knee around the threshold to enter gain reduction
+	   more softly.  Default is 2.828427125. Allowed range is from 1 to 8.
+
+       detection
+	   Choose if exact signal should be taken for detection or an RMS like
+	   one.  Default is rms. Can be peak or rms.
+
+       link
+	   Choose if the average level between all channels or the louder
+	   channel affects the reduction.  Default is average. Can be average
+	   or maximum.
+
+       level_sc
+	   Set sidechain gain. Default is 1. Range is from 0.015625 to 64.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   silencedetect
+       Detect silence in an audio stream.
+
+       This filter logs a message when it detects that the input audio volume
+       is less or equal to a noise tolerance value for a duration greater or
+       equal to the minimum detected noise duration.
+
+       The printed times and duration are expressed in seconds. The
+       "lavfi.silence_start" or "lavfi.silence_start.X" metadata key is set on
+       the first frame whose timestamp equals or exceeds the detection
+       duration and it contains the timestamp of the first frame of the
+       silence.
+
+       The "lavfi.silence_duration" or "lavfi.silence_duration.X" and
+       "lavfi.silence_end" or "lavfi.silence_end.X" metadata keys are set on
+       the first frame after the silence. If mono is enabled, and each channel
+       is evaluated separately, the ".X" suffixed keys are used, and "X"
+       corresponds to the channel number.
+
+       The filter accepts the following options:
+
+       noise, n
+	   Set noise tolerance. Can be specified in dB (in case "dB" is
+	   appended to the specified value) or amplitude ratio. Default is
+	   -60dB, or 0.001.
+
+       duration, d
+	   Set silence duration until notification (default is 2 seconds). See
+	   the Time duration section in the ffmpeg-utils(1) manual for the
+	   accepted syntax.
+
+       mono, m
+	   Process each channel separately, instead of combined. By default is
+	   disabled.
+
+       Examples
+
+       o   Detect 5 seconds of silence with -50dB noise tolerance:
+
+		   silencedetect=n=-50dB:d=5
+
+       o   Complete example with ffmpeg to detect silence with 0.0001 noise
+	   tolerance in silence.mp3:
+
+		   ffmpeg -i silence.mp3 -af silencedetect=noise=0.0001 -f null -
+
+   silenceremove
+       Remove silence from the beginning, middle or end of the audio.
+
+       The filter accepts the following options:
+
+       start_periods
+	   This value is used to indicate if audio should be trimmed at
+	   beginning of the audio. A value of zero indicates no silence should
+	   be trimmed from the beginning. When specifying a non-zero value, it
+	   trims audio up until it finds non-silence. Normally, when trimming
+	   silence from beginning of audio the start_periods will be 1 but it
+	   can be increased to higher values to trim all audio up to specific
+	   count of non-silence periods.  Default value is 0.
+
+       start_duration
+	   Specify the amount of time that non-silence must be detected before
+	   it stops trimming audio. By increasing the duration, bursts of
+	   noises can be treated as silence and trimmed off. Default value is
+	   0.
+
+       start_threshold
+	   This indicates what sample value should be treated as silence. For
+	   digital audio, a value of 0 may be fine but for audio recorded from
+	   analog, you may wish to increase the value to account for
+	   background noise.  Can be specified in dB (in case "dB" is appended
+	   to the specified value) or amplitude ratio. Default value is 0.
+
+       start_silence
+	   Specify max duration of silence at beginning that will be kept
+	   after trimming. Default is 0, which is equal to trimming all
+	   samples detected as silence.
+
+       start_mode
+	   Specify mode of detection of silence end at start of multi-channel
+	   audio.  Can be any or all. Default is any.  With any, any sample
+	   from any channel that is detected as non-silence will trigger end
+	   of silence trimming at start of audio stream.  With all, only if
+	   every sample from every channel is detected as non-silence will
+	   trigger end of silence trimming at start of audio stream, limited
+	   usage.
+
+       stop_periods
+	   Set the count for trimming silence from the end of audio. When
+	   specifying a positive value, it trims audio after it finds
+	   specified silence period.  To remove silence from the middle of a
+	   file, specify a stop_periods that is negative. This value is then
+	   treated as a positive value and is used to indicate the effect
+	   should restart processing as specified by stop_periods, making it
+	   suitable for removing periods of silence in the middle of the
+	   audio.  Default value is 0.
+
+       stop_duration
+	   Specify a duration of silence that must exist before audio is not
+	   copied any more. By specifying a higher duration, silence that is
+	   wanted can be left in the audio.  Default value is 0.
+
+       stop_threshold
+	   This is the same as start_threshold but for trimming silence from
+	   the end of audio.  Can be specified in dB (in case "dB" is appended
+	   to the specified value) or amplitude ratio. Default value is 0.
+
+       stop_silence
+	   Specify max duration of silence at end that will be kept after
+	   trimming. Default is 0, which is equal to trimming all samples
+	   detected as silence.
+
+       stop_mode
+	   Specify mode of detection of silence start after start of multi-
+	   channel audio.  Can be any or all. Default is all.  With any, any
+	   sample from any channel that is detected as silence will trigger
+	   start of silence trimming after start of audio stream, limited
+	   usage.  With all, only if every sample from every channel is
+	   detected as silence will trigger start of silence trimming after
+	   start of audio stream.
+
+       detection
+	   Set how is silence detected.
+
+	   avg Mean of absolute values of samples in moving window.
+
+	   rms Root squared mean of absolute values of samples in moving
+	       window.
+
+	   peak
+	       Maximum of absolute values of samples in moving window.
+
+	   median
+	       Median of absolute values of samples in moving window.
+
+	   ptp Absolute of max peak to min peak difference of samples in
+	       moving window.
+
+	   dev Standard deviation of values of samples in moving window.
+
+	   Default value is "rms".
+
+       window
+	   Set duration in number of seconds used to calculate size of window
+	   in number of samples for detecting silence. Using 0 will
+	   effectively disable any windowing and use only single sample per
+	   channel for silence detection.  In that case it may be needed to
+	   also set start_silence and/or stop_silence to nonzero values with
+	   also start_duration and/or stop_duration to nonzero values.
+	   Default value is 0.02. Allowed range is from 0 to 10.
+
+       timestamp
+	   Set processing mode of every audio frame output timestamp.
+
+	   write
+	       Full timestamps rewrite, keep only the start time for the first
+	       output frame.
+
+	   copy
+	       Non-dropped frames are left with same timestamp as input audio
+	       frame.
+
+	   Defaults value is "write".
+
+       Examples
+
+       o   The following example shows how this filter can be used to start a
+	   recording that does not contain the delay at the start which
+	   usually occurs between pressing the record button and the start of
+	   the performance:
+
+		   silenceremove=start_periods=1:start_duration=5:start_threshold=0.02
+
+       o   Trim all silence encountered from beginning to end where there is
+	   more than 1 second of silence in audio:
+
+		   silenceremove=stop_periods=-1:stop_duration=1:stop_threshold=-90dB
+
+       o   Trim all digital silence samples, using peak detection, from
+	   beginning to end where there is more than 0 samples of digital
+	   silence in audio and digital silence is detected in all channels at
+	   same positions in stream:
+
+		   silenceremove=window=0:detection=peak:stop_mode=all:start_mode=all:stop_periods=-1:stop_threshold=0
+
+       o   Trim every 2nd encountered silence period from beginning to end
+	   where there is more than 1 second of silence per silence period in
+	   audio:
+
+		   silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB
+
+       o   Similar as above, but keep maximum of 0.5 seconds of silence from
+	   each trimmed period:
+
+		   silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB:stop_silence=0.5
+
+       o   Similar as above, but keep maximum of 1.5 seconds of silence from
+	   start of audio:
+
+		   silenceremove=stop_periods=-2:stop_duration=1:stop_threshold=-90dB:stop_silence=0.5:start_periods=1:start_duration=1:start_silence=1.5:stop_threshold=-90dB
+
+       Commands
+
+       This filter supports some above options as commands.
+
+   sofalizer
+       SOFAlizer uses head-related transfer functions (HRTFs) to create
+       virtual loudspeakers around the user for binaural listening via
+       headphones (audio formats up to 9 channels supported).  The HRTFs are
+       stored in SOFA files (see <http://www.sofacoustics.org/> for a
+       database).  SOFAlizer is developed at the Acoustics Research Institute
+       (ARI) of the Austrian Academy of Sciences.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libmysofa".
+
+       The filter accepts the following options:
+
+       sofa
+	   Set the SOFA file used for rendering.
+
+       gain
+	   Set gain applied to audio. Value is in dB. Default is 0.
+
+       rotation
+	   Set rotation of virtual loudspeakers in deg. Default is 0.
+
+       elevation
+	   Set elevation of virtual speakers in deg. Default is 0.
+
+       radius
+	   Set distance in meters between loudspeakers and the listener with
+	   near-field HRTFs. Default is 1.
+
+       type
+	   Set processing type. Can be time or freq. time is processing audio
+	   in time domain which is slow.  freq is processing audio in
+	   frequency domain which is fast.  Default is freq.
+
+       speakers
+	   Set custom positions of virtual loudspeakers. Syntax for this
+	   option is: <CH> <AZIM> <ELEV>[|<CH> <AZIM> <ELEV>|...].  Each
+	   virtual loudspeaker is described with short channel name following
+	   with azimuth and elevation in degrees.  Each virtual loudspeaker
+	   description is separated by '|'.  For example to override front
+	   left and front right channel positions use: 'speakers=FL 45 15|FR
+	   345 15'.  Descriptions with unrecognised channel names are ignored.
+
+       lfegain
+	   Set custom gain for LFE channels. Value is in dB. Default is 0.
+
+       framesize
+	   Set custom frame size in number of samples. Default is 1024.
+	   Allowed range is from 1024 to 96000. Only used if option type is
+	   set to freq.
+
+       normalize
+	   Should all IRs be normalized upon importing SOFA file.  By default
+	   is enabled.
+
+       interpolate
+	   Should nearest IRs be interpolated with neighbor IRs if exact
+	   position does not match. By default is disabled.
+
+       minphase
+	   Minphase all IRs upon loading of SOFA file. By default is disabled.
+
+       anglestep
+	   Set neighbor search angle step. Only used if option interpolate is
+	   enabled.
+
+       radstep
+	   Set neighbor search radius step. Only used if option interpolate is
+	   enabled.
+
+       Examples
+
+       o   Using ClubFritz6 sofa file:
+
+		   sofalizer=sofa=/path/to/ClubFritz6.sofa:type=freq:radius=1
+
+       o   Using ClubFritz12 sofa file and bigger radius with small rotation:
+
+		   sofalizer=sofa=/path/to/ClubFritz12.sofa:type=freq:radius=2:rotation=5
+
+       o   Similar as above but with custom speaker positions for front left,
+	   front right, back left and back right and also with custom gain:
+
+		   "sofalizer=sofa=/path/to/ClubFritz6.sofa:type=freq:radius=2:speakers=FL 45|FR 315|BL 135|BR 225:gain=28"
+
+   speechnorm
+       Speech Normalizer.
+
+       This filter expands or compresses each half-cycle of audio samples
+       (local set of samples all above or all below zero and between two
+       nearest zero crossings) depending on threshold value, so audio reaches
+       target peak value under conditions controlled by below options.
+
+       The filter accepts the following options:
+
+       peak, p
+	   Set the expansion target peak value. This specifies the highest
+	   allowed absolute amplitude level for the normalized audio input.
+	   Default value is 0.95. Allowed range is from 0.0 to 1.0.
+
+       expansion, e
+	   Set the maximum expansion factor. Allowed range is from 1.0 to
+	   50.0. Default value is 2.0.	This option controls maximum local
+	   half-cycle of samples expansion. The maximum expansion would be
+	   such that local peak value reaches target peak value but never to
+	   surpass it and that ratio between new and previous peak value does
+	   not surpass this option value.
+
+       compression, c
+	   Set the maximum compression factor. Allowed range is from 1.0 to
+	   50.0. Default value is 2.0.	This option controls maximum local
+	   half-cycle of samples compression. This option is used only if
+	   threshold option is set to value greater than 0.0, then in such
+	   cases when local peak is lower or same as value set by threshold
+	   all samples belonging to that peak's half-cycle will be compressed
+	   by current compression factor.
+
+       threshold, t
+	   Set the threshold value. Default value is 0.0. Allowed range is
+	   from 0.0 to 1.0.  This option specifies which half-cycles of
+	   samples will be compressed and which will be expanded.  Any half-
+	   cycle samples with their local peak value below or same as this
+	   option value will be compressed by current compression factor,
+	   otherwise, if greater than threshold value they will be expanded
+	   with expansion factor so that it could reach peak target value but
+	   never surpass it.
+
+       raise, r
+	   Set the expansion raising amount per each half-cycle of samples.
+	   Default value is 0.001.  Allowed range is from 0.0 to 1.0. This
+	   controls how fast expansion factor is raised per each new half-
+	   cycle until it reaches expansion value.  Setting this options too
+	   high may lead to distortions.
+
+       fall, f
+	   Set the compression raising amount per each half-cycle of samples.
+	   Default value is 0.001.  Allowed range is from 0.0 to 1.0. This
+	   controls how fast compression factor is raised per each new half-
+	   cycle until it reaches compression value.
+
+       channels, h
+	   Specify which channels to filter, by default all available channels
+	   are filtered.
+
+       invert, i
+	   Enable inverted filtering, by default is disabled. This inverts
+	   interpretation of threshold option. When enabled any half-cycle of
+	   samples with their local peak value below or same as threshold
+	   option will be expanded otherwise it will be compressed.
+
+       link, l
+	   Link channels when calculating gain applied to each filtered
+	   channel sample, by default is disabled.  When disabled each
+	   filtered channel gain calculation is independent, otherwise when
+	   this option is enabled the minimum of all possible gains for each
+	   filtered channel is used.
+
+       rms, m
+	   Set the expansion target RMS value. This specifies the highest
+	   allowed RMS level for the normalized audio input. Default value is
+	   0.0, thus disabled. Allowed range is from 0.0 to 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Weak and slow amplification:
+
+		   speechnorm=e=3:r=0.00001:l=1
+
+       o   Moderate and slow amplification:
+
+		   speechnorm=e=6.25:r=0.00001:l=1
+
+       o   Strong and fast amplification:
+
+		   speechnorm=e=12.5:r=0.0001:l=1
+
+       o   Very strong and fast amplification:
+
+		   speechnorm=e=25:r=0.0001:l=1
+
+       o   Extreme and fast amplification:
+
+		   speechnorm=e=50:r=0.0001:l=1
+
+   stereotools
+       This filter has some handy utilities to manage stereo signals, for
+       converting M/S stereo recordings to L/R signal while having control
+       over the parameters or spreading the stereo image of master track.
+
+       The filter accepts the following options:
+
+       level_in
+	   Set input level before filtering for both channels. Defaults is 1.
+	   Allowed range is from 0.015625 to 64.
+
+       level_out
+	   Set output level after filtering for both channels. Defaults is 1.
+	   Allowed range is from 0.015625 to 64.
+
+       balance_in
+	   Set input balance between both channels. Default is 0.  Allowed
+	   range is from -1 to 1.
+
+       balance_out
+	   Set output balance between both channels. Default is 0.  Allowed
+	   range is from -1 to 1.
+
+       softclip
+	   Enable softclipping. Results in analog distortion instead of harsh
+	   digital 0dB clipping. Disabled by default.
+
+       mutel
+	   Mute the left channel. Disabled by default.
+
+       muter
+	   Mute the right channel. Disabled by default.
+
+       phasel
+	   Change the phase of the left channel. Disabled by default.
+
+       phaser
+	   Change the phase of the right channel. Disabled by default.
+
+       mode
+	   Set stereo mode. Available values are:
+
+	   lr>lr
+	       Left/Right to Left/Right, this is default.
+
+	   lr>ms
+	       Left/Right to Mid/Side.
+
+	   ms>lr
+	       Mid/Side to Left/Right.
+
+	   lr>ll
+	       Left/Right to Left/Left.
+
+	   lr>rr
+	       Left/Right to Right/Right.
+
+	   lr>l+r
+	       Left/Right to Left + Right.
+
+	   lr>rl
+	       Left/Right to Right/Left.
+
+	   ms>ll
+	       Mid/Side to Left/Left.
+
+	   ms>rr
+	       Mid/Side to Right/Right.
+
+	   ms>rl
+	       Mid/Side to Right/Left.
+
+	   lr>l-r
+	       Left/Right to Left - Right.
+
+       slev
+	   Set level of side signal. Default is 1.  Allowed range is from
+	   0.015625 to 64.
+
+       sbal
+	   Set balance of side signal. Default is 0.  Allowed range is from -1
+	   to 1.
+
+       mlev
+	   Set level of the middle signal. Default is 1.  Allowed range is
+	   from 0.015625 to 64.
+
+       mpan
+	   Set middle signal pan. Default is 0. Allowed range is from -1 to 1.
+
+       base
+	   Set stereo base between mono and inversed channels. Default is 0.
+	   Allowed range is from -1 to 1.
+
+       delay
+	   Set delay in milliseconds how much to delay left from right channel
+	   and vice versa. Default is 0. Allowed range is from -20 to 20.
+
+       sclevel
+	   Set S/C level. Default is 1. Allowed range is from 1 to 100.
+
+       phase
+	   Set the stereo phase in degrees. Default is 0. Allowed range is
+	   from 0 to 360.
+
+       bmode_in, bmode_out
+	   Set balance mode for balance_in/balance_out option.
+
+	   Can be one of the following:
+
+	   balance
+	       Classic balance mode. Attenuate one channel at time.  Gain is
+	       raised up to 1.
+
+	   amplitude
+	       Similar as classic mode above but gain is raised up to 2.
+
+	   power
+	       Equal power distribution, from -6dB to +6dB range.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Apply karaoke like effect:
+
+		   stereotools=mlev=0.015625
+
+       o   Convert M/S signal to L/R:
+
+		   "stereotools=mode=ms>lr"
+
+   stereowiden
+       This filter enhance the stereo effect by suppressing signal common to
+       both channels and by delaying the signal of left into right and vice
+       versa, thereby widening the stereo effect.
+
+       The filter accepts the following options:
+
+       delay
+	   Time in milliseconds of the delay of left signal into right and
+	   vice versa.	Default is 20 milliseconds.
+
+       feedback
+	   Amount of gain in delayed signal into right and vice versa. Gives a
+	   delay effect of left signal in right output and vice versa which
+	   gives widening effect. Default is 0.3.
+
+       crossfeed
+	   Cross feed of left into right with inverted phase. This helps in
+	   suppressing the mono. If the value is 1 it will cancel all the
+	   signal common to both channels. Default is 0.3.
+
+       drymix
+	   Set level of input signal of original channel. Default is 0.8.
+
+       Commands
+
+       This filter supports the all above options except "delay" as commands.
+
+   superequalizer
+       Apply 18 band equalizer.
+
+       The filter accepts the following options:
+
+       1b  Set 65Hz band gain.
+
+       2b  Set 92Hz band gain.
+
+       3b  Set 131Hz band gain.
+
+       4b  Set 185Hz band gain.
+
+       5b  Set 262Hz band gain.
+
+       6b  Set 370Hz band gain.
+
+       7b  Set 523Hz band gain.
+
+       8b  Set 740Hz band gain.
+
+       9b  Set 1047Hz band gain.
+
+       10b Set 1480Hz band gain.
+
+       11b Set 2093Hz band gain.
+
+       12b Set 2960Hz band gain.
+
+       13b Set 4186Hz band gain.
+
+       14b Set 5920Hz band gain.
+
+       15b Set 8372Hz band gain.
+
+       16b Set 11840Hz band gain.
+
+       17b Set 16744Hz band gain.
+
+       18b Set 20000Hz band gain.
+
+   surround
+       Apply audio surround upmix filter.
+
+       This filter allows to produce multichannel output from audio stream.
+
+       The filter accepts the following options:
+
+       chl_out
+	   Set output channel layout. By default, this is 5.1.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       chl_in
+	   Set input channel layout. By default, this is stereo.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       level_in
+	   Set input volume level. By default, this is 1.
+
+       level_out
+	   Set output volume level. By default, this is 1.
+
+       lfe Enable LFE channel output if output channel layout has it. By
+	   default, this is enabled.
+
+       lfe_low
+	   Set LFE low cut off frequency. By default, this is 128 Hz.
+
+       lfe_high
+	   Set LFE high cut off frequency. By default, this is 256 Hz.
+
+       lfe_mode
+	   Set LFE mode, can be add or sub. Default is add.  In add mode, LFE
+	   channel is created from input audio and added to output.  In sub
+	   mode, LFE channel is created from input audio and added to output
+	   but also all non-LFE output channels are subtracted with output LFE
+	   channel.
+
+       smooth
+	   Set temporal smoothness strength, used to gradually change factors
+	   when transforming stereo sound in time. Allowed range is from 0.0
+	   to 1.0.  Useful to improve output quality with focus option values
+	   greater than 0.0.  Default is 0.0. Only values inside this range
+	   and without edges are effective.
+
+       angle
+	   Set angle of stereo surround transform, Allowed range is from 0 to
+	   360.  Default is 90.
+
+       focus
+	   Set focus of stereo surround transform, Allowed range is from -1 to
+	   1.  Default is 0.
+
+       fc_in
+	   Set front center input volume. By default, this is 1.
+
+       fc_out
+	   Set front center output volume. By default, this is 1.
+
+       fl_in
+	   Set front left input volume. By default, this is 1.
+
+       fl_out
+	   Set front left output volume. By default, this is 1.
+
+       fr_in
+	   Set front right input volume. By default, this is 1.
+
+       fr_out
+	   Set front right output volume. By default, this is 1.
+
+       sl_in
+	   Set side left input volume. By default, this is 1.
+
+       sl_out
+	   Set side left output volume. By default, this is 1.
+
+       sr_in
+	   Set side right input volume. By default, this is 1.
+
+       sr_out
+	   Set side right output volume. By default, this is 1.
+
+       bl_in
+	   Set back left input volume. By default, this is 1.
+
+       bl_out
+	   Set back left output volume. By default, this is 1.
+
+       br_in
+	   Set back right input volume. By default, this is 1.
+
+       br_out
+	   Set back right output volume. By default, this is 1.
+
+       bc_in
+	   Set back center input volume. By default, this is 1.
+
+       bc_out
+	   Set back center output volume. By default, this is 1.
+
+       lfe_in
+	   Set LFE input volume. By default, this is 1.
+
+       lfe_out
+	   Set LFE output volume. By default, this is 1.
+
+       allx
+	   Set spread usage of stereo image across X axis for all channels.
+	   Allowed range is from -1 to 15.  By default this value is negative
+	   -1, and thus unused.
+
+       ally
+	   Set spread usage of stereo image across Y axis for all channels.
+	   Allowed range is from -1 to 15.  By default this value is negative
+	   -1, and thus unused.
+
+       fcx, flx, frx, blx, brx, slx, srx, bcx
+	   Set spread usage of stereo image across X axis for each channel.
+	   Allowed range is from 0.06 to 15.  By default this value is 0.5.
+
+       fcy, fly, fry, bly, bry, sly, sry, bcy
+	   Set spread usage of stereo image across Y axis for each channel.
+	   Allowed range is from 0.06 to 15.  By default this value is 0.5.
+
+       win_size
+	   Set window size. Allowed range is from 1024 to 65536. Default size
+	   is 4096.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann, hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hann".
+
+       overlap
+	   Set window overlap. If set to 1, the recommended overlap for
+	   selected window function will be picked. Default is 0.5.
+
+   tiltshelf
+       Boost or cut the lower frequencies and cut or boost higher frequencies
+       of the audio using a two-pole shelving filter with a response similar
+       to that of a standard hi-fi's tone-controls.  This is also known as
+       shelving equalisation (EQ).
+
+       The filter accepts the following options:
+
+       gain, g
+	   Give the gain at 0 Hz. Its useful range is about -20 (for a large
+	   cut) to +20 (for a large boost).  Beware of clipping when using a
+	   positive gain.
+
+       frequency, f
+	   Set the filter's central frequency and so can be used to extend or
+	   reduce the frequency range to be boosted or cut.  The default value
+	   is 3000 Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Determine how steep is the filter's shelf transition.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports some options as commands.
+
+   treble, highshelf
+       Boost or cut treble (upper) frequencies of the audio using a two-pole
+       shelving filter with a response similar to that of a standard hi-fi's
+       tone-controls. This is also known as shelving equalisation (EQ).
+
+       The filter accepts the following options:
+
+       gain, g
+	   Give the gain at whichever is the lower of ~22 kHz and the Nyquist
+	   frequency. Its useful range is about -20 (for a large cut) to +20
+	   (for a large boost). Beware of clipping when using a positive gain.
+
+       frequency, f
+	   Set the filter's central frequency and so can be used to extend or
+	   reduce the frequency range to be boosted or cut.  The default value
+	   is 3000 Hz.
+
+       width_type, t
+	   Set method to specify band-width of filter.
+
+	   h   Hz
+
+	   q   Q-Factor
+
+	   o   octave
+
+	   s   slope
+
+	   k   kHz
+
+       width, w
+	   Determine how steep is the filter's shelf transition.
+
+       poles, p
+	   Set number of poles. Default is 2.
+
+       mix, m
+	   How much to use filtered signal in output. Default is 1.  Range is
+	   between 0 and 1.
+
+       channels, c
+	   Specify which channels to filter, by default all available are
+	   filtered.
+
+       normalize, n
+	   Normalize biquad coefficients, by default is disabled.  Enabling it
+	   will normalize magnitude response at DC to 0dB.
+
+       transform, a
+	   Set transform type of IIR filter.
+
+	   di
+	   dii
+	   tdi
+	   tdii
+	   latt
+	   svf
+	   zdf
+       precision, r
+	   Set precision of filtering.
+
+	   auto
+	       Pick automatic sample format depending on surround filters.
+
+	   s16 Always use signed 16-bit.
+
+	   s32 Always use signed 32-bit.
+
+	   f32 Always use float 32-bit.
+
+	   f64 Always use float 64-bit.
+
+       block_size, b
+	   Set block size used for reverse IIR processing. If this value is
+	   set to high enough value (higher than impulse response length
+	   truncated when reaches near zero values) filtering will become
+	   linear phase otherwise if not big enough it will just produce nasty
+	   artifacts.
+
+	   Note that filter delay will be exactly this many samples when set
+	   to non-zero value.
+
+       Commands
+
+       This filter supports the following commands:
+
+       frequency, f
+	   Change treble frequency.  Syntax for the command is : "frequency"
+
+       width_type, t
+	   Change treble width_type.  Syntax for the command is : "width_type"
+
+       width, w
+	   Change treble width.  Syntax for the command is : "width"
+
+       gain, g
+	   Change treble gain.	Syntax for the command is : "gain"
+
+       mix, m
+	   Change treble mix.  Syntax for the command is : "mix"
+
+   tremolo
+       Sinusoidal amplitude modulation.
+
+       The filter accepts the following options:
+
+       f   Modulation frequency in Hertz. Modulation frequencies in the
+	   subharmonic range (20 Hz or lower) will result in a tremolo effect.
+	   This filter may also be used as a ring modulator by specifying a
+	   modulation frequency higher than 20 Hz.  Range is 0.1 - 20000.0.
+	   Default value is 5.0 Hz.
+
+       d   Depth of modulation as a percentage. Range is 0.0 - 1.0.  Default
+	   value is 0.5.
+
+   vibrato
+       Sinusoidal phase modulation.
+
+       The filter accepts the following options:
+
+       f   Modulation frequency in Hertz.  Range is 0.1 - 20000.0. Default
+	   value is 5.0 Hz.
+
+       d   Depth of modulation as a percentage. Range is 0.0 - 1.0.  Default
+	   value is 0.5.
+
+   virtualbass
+       Apply audio Virtual Bass filter.
+
+       This filter accepts stereo input and produce stereo with LFE (2.1)
+       channels output.  The newly produced LFE channel have enhanced virtual
+       bass originally obtained from both stereo channels.  This filter
+       outputs front left and front right channels unchanged as available in
+       stereo input.
+
+       The filter accepts the following options:
+
+       cutoff
+	   Set the virtual bass cutoff frequency. Default value is 250 Hz.
+	   Allowed range is from 100 to 500 Hz.
+
+       strength
+	   Set the virtual bass strength. Allowed range is from 0.5 to 3.
+	   Default value is 3.
+
+   volume
+       Adjust the input audio volume.
+
+       It accepts the following parameters:
+
+       volume
+	   Set audio volume expression.
+
+	   Output values are clipped to the maximum value.
+
+	   The output audio volume is given by the relation:
+
+		   <output_volume> = <volume> * <input_volume>
+
+	   The default value for volume is "1.0".
+
+       precision
+	   This parameter represents the mathematical precision.
+
+	   It determines which input sample formats will be allowed, which
+	   affects the precision of the volume scaling.
+
+	   fixed
+	       8-bit fixed-point; this limits input sample format to U8, S16,
+	       and S32.
+
+	   float
+	       32-bit floating-point; this limits input sample format to FLT.
+	       (default)
+
+	   double
+	       64-bit floating-point; this limits input sample format to DBL.
+
+       replaygain
+	   Choose the behaviour on encountering ReplayGain side data in input
+	   frames.
+
+	   drop
+	       Remove ReplayGain side data, ignoring its contents (the
+	       default).
+
+	   ignore
+	       Ignore ReplayGain side data, but leave it in the frame.
+
+	   track
+	       Prefer the track gain, if present.
+
+	   album
+	       Prefer the album gain, if present.
+
+       replaygain_preamp
+	   Pre-amplification gain in dB to apply to the selected replaygain
+	   gain.
+
+	   Default value for replaygain_preamp is 0.0.
+
+       replaygain_noclip
+	   Prevent clipping by limiting the gain applied.
+
+	   Default value for replaygain_noclip is 1.
+
+       eval
+	   Set when the volume expression is evaluated.
+
+	   It accepts the following values:
+
+	   once
+	       only evaluate expression once during the filter initialization,
+	       or when the volume command is sent
+
+	   frame
+	       evaluate expression for each incoming frame
+
+	   Default value is once.
+
+       The volume expression can contain the following parameters.
+
+       n   frame number (starting at zero)
+
+       nb_channels
+	   number of channels
+
+       nb_consumed_samples
+	   number of samples consumed by the filter
+
+       nb_samples
+	   number of samples in the current frame
+
+       pos original frame position in the file; deprecated, do not use
+
+       pts frame PTS
+
+       sample_rate
+	   sample rate
+
+       startpts
+	   PTS at start of stream
+
+       startt
+	   time at start of stream
+
+       t   frame time
+
+       tb  timestamp timebase
+
+       volume
+	   last set volume value
+
+       Note that when eval is set to once only the sample_rate and tb
+       variables are available, all other variables will evaluate to NAN.
+
+       Commands
+
+       This filter supports the following commands:
+
+       volume
+	   Modify the volume expression.  The command accepts the same syntax
+	   of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+       Examples
+
+       o   Halve the input audio volume:
+
+		   volume=volume=0.5
+		   volume=volume=1/2
+		   volume=volume=-6.0206dB
+
+	   In all the above example the named key for volume can be omitted,
+	   for example like in:
+
+		   volume=0.5
+
+       o   Increase input audio power by 6 decibels using fixed-point
+	   precision:
+
+		   volume=volume=6dB:precision=fixed
+
+       o   Fade volume after time 10 with an annihilation period of 5 seconds:
+
+		   volume='if(lt(t,10),1,max(1-(t-10)/5,0))':eval=frame
+
+   volumedetect
+       Detect the volume of the input video.
+
+       The filter has no parameters. It supports only 16-bit signed integer
+       samples, so the input will be converted when needed. Statistics about
+       the volume will be printed in the log when the input stream end is
+       reached.
+
+       In particular it will show the mean volume (root mean square), maximum
+       volume (on a per-sample basis), and the beginning of a histogram of the
+       registered volume values (from the maximum value to a cumulated 1/1000
+       of the samples).
+
+       All volumes are in decibels relative to the maximum PCM value.
+
+       Examples
+
+       Here is an excerpt of the output:
+
+	       [Parsed_volumedetect_0  0xa23120] mean_volume: -27 dB
+	       [Parsed_volumedetect_0  0xa23120] max_volume: -4 dB
+	       [Parsed_volumedetect_0  0xa23120] histogram_4db: 6
+	       [Parsed_volumedetect_0  0xa23120] histogram_5db: 62
+	       [Parsed_volumedetect_0  0xa23120] histogram_6db: 286
+	       [Parsed_volumedetect_0  0xa23120] histogram_7db: 1042
+	       [Parsed_volumedetect_0  0xa23120] histogram_8db: 2551
+	       [Parsed_volumedetect_0  0xa23120] histogram_9db: 4609
+	       [Parsed_volumedetect_0  0xa23120] histogram_10db: 8409
+
+       It means that:
+
+       o   The mean square energy is approximately -27 dB, or 10^-2.7.
+
+       o   The largest sample is at -4 dB, or more precisely between -4 dB and
+	   -5 dB.
+
+       o   There are 6 samples at -4 dB, 62 at -5 dB, 286 at -6 dB, etc.
+
+       In other words, raising the volume by +4 dB does not cause any
+       clipping, raising it by +5 dB causes clipping for 6 samples, etc.
+
+AUDIO SOURCES
+       Below is a description of the currently available audio sources.
+
+   abuffer
+       Buffer audio frames, and make them available to the filter chain.
+
+       This source is mainly intended for a programmatic use, in particular
+       through the interface defined in libavfilter/buffersrc.h.
+
+       It accepts the following parameters:
+
+       time_base
+	   The timebase which will be used for timestamps of submitted frames.
+	   It must be either a floating-point number or in
+	   numerator/denominator form.
+
+       sample_rate
+	   The sample rate of the incoming audio buffers.
+
+       sample_fmt
+	   The sample format of the incoming audio buffers.  Either a sample
+	   format name or its corresponding integer representation from the
+	   enum AVSampleFormat in libavutil/samplefmt.h
+
+       channel_layout
+	   The channel layout of the incoming audio buffers.  Either a channel
+	   layout name from channel_layout_map in libavutil/channel_layout.c
+	   or its corresponding integer representation from the AV_CH_LAYOUT_*
+	   macros in libavutil/channel_layout.h
+
+       channels
+	   The number of channels of the incoming audio buffers.  If both
+	   channels and channel_layout are specified, then they must be
+	   consistent.
+
+       Examples
+
+	       abuffer=sample_rate=44100:sample_fmt=s16p:channel_layout=stereo
+
+       will instruct the source to accept planar 16bit signed stereo at
+       44100Hz.  Since the sample format with name "s16p" corresponds to the
+       number 6 and the "stereo" channel layout corresponds to the value 0x3,
+       this is equivalent to:
+
+	       abuffer=sample_rate=44100:sample_fmt=6:channel_layout=0x3
+
+   aevalsrc
+       Generate an audio signal specified by an expression.
+
+       This source accepts in input one or more expressions (one for each
+       channel), which are evaluated and used to generate a corresponding
+       audio signal.
+
+       This source accepts the following options:
+
+       exprs
+	   Set the '|'-separated expressions list for each separate channel.
+	   In case the channel_layout option is not specified, the selected
+	   channel layout depends on the number of provided expressions.
+	   Otherwise the last specified expression is applied to the remaining
+	   output channels.
+
+       channel_layout, c
+	   Set the channel layout. The number of channels in the specified
+	   layout must be equal to the number of specified expressions.
+
+       duration, d
+	   Set the minimum duration of the sourced audio. See the Time
+	   duration section in the ffmpeg-utils(1) manual for the accepted
+	   syntax.  Note that the resulting duration may be greater than the
+	   specified duration, as the generated audio is always cut at the end
+	   of a complete frame.
+
+	   If not specified, or the expressed duration is negative, the audio
+	   is supposed to be generated forever.
+
+       nb_samples, n
+	   Set the number of samples per channel per each output frame,
+	   default to 1024.
+
+       sample_rate, s
+	   Specify the sample rate, default to 44100.
+
+       Each expression in exprs can contain the following constants:
+
+       n   number of the evaluated sample, starting from 0
+
+       t   time of the evaluated sample expressed in seconds, starting from 0
+
+       s   sample rate
+
+       Examples
+
+       o   Generate silence:
+
+		   aevalsrc=0
+
+       o   Generate a sin signal with frequency of 440 Hz, set sample rate to
+	   8000 Hz:
+
+		   aevalsrc="sin(440*2*PI*t):s=8000"
+
+       o   Generate a two channels signal, specify the channel layout (Front
+	   Center + Back Center) explicitly:
+
+		   aevalsrc="sin(420*2*PI*t)|cos(430*2*PI*t):c=FC|BC"
+
+       o   Generate white noise:
+
+		   aevalsrc="-2+random(0)"
+
+       o   Generate an amplitude modulated signal:
+
+		   aevalsrc="sin(10*2*PI*t)*sin(880*2*PI*t)"
+
+       o   Generate 2.5 Hz binaural beats on a 360 Hz carrier:
+
+		   aevalsrc="0.1*sin(2*PI*(360-2.5/2)*t) | 0.1*sin(2*PI*(360+2.5/2)*t)"
+
+   afdelaysrc
+       Generate a fractional delay FIR coefficients.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       delay, d
+	   Set the fractional delay. Default is 0.
+
+       sample_rate, r
+	   Set the sample rate, default is 44100.
+
+       nb_samples, n
+	   Set the number of samples per each frame. Default is 1024.
+
+       taps, t
+	   Set the number of filter coefficients in output audio stream.
+	   Default value is 0.
+
+       channel_layout, c
+	   Specifies the channel layout, and can be a string representing a
+	   channel layout.  The default value of channel_layout is "stereo".
+
+   afireqsrc
+       Generate a FIR equalizer coefficients.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       preset, p
+	   Set equalizer preset.  Default preset is "flat".
+
+	   Available presets are:
+
+	   custom
+	   flat
+	   acoustic
+	   bass
+	   beats
+	   classic
+	   clear
+	   deep bass
+	   dubstep
+	   electronic
+	   hard-style
+	   hip-hop
+	   jazz
+	   metal
+	   movie
+	   pop
+	   r&b
+	   rock
+	   vocal booster
+       gains, g
+	   Set custom gains for each band. Only used if the preset option is
+	   set to "custom".  Gains are separated by white spaces and each gain
+	   is set in dBFS.  Default is "0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0".
+
+       bands, b
+	   Set the custom bands from where custon equalizer gains are set.
+	   This must be in strictly increasing order. Only used if the preset
+	   option is set to "custom".  Bands are separated by white spaces and
+	   each band represent frequency in Hz.  Default is "25 40 63 100 160
+	   250 400 630 1000 1600 2500 4000 6300 10000 16000 24000".
+
+       taps, t
+	   Set number of filter coefficients in output audio stream.  Default
+	   value is 4096.
+
+       sample_rate, r
+	   Set sample rate of output audio stream, default is 44100.
+
+       nb_samples, n
+	   Set number of samples per each frame in output audio stream.
+	   Default is 1024.
+
+       interp, i
+	   Set interpolation method for FIR equalizer coefficients. Can be
+	   "linear" or "cubic".
+
+       phase, h
+	   Set phase type of FIR filter. Can be "linear" or "min": minimum-
+	   phase.  Default is minimum-phase filter.
+
+   afirsrc
+       Generate a FIR coefficients using frequency sampling method.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       taps, t
+	   Set number of filter coefficients in output audio stream.  Default
+	   value is 1025.
+
+       frequency, f
+	   Set frequency points from where magnitude and phase are set.  This
+	   must be in non decreasing order, and first element must be 0, while
+	   last element must be 1. Elements are separated by white spaces.
+
+       magnitude, m
+	   Set magnitude value for every frequency point set by frequency.
+	   Number of values must be same as number of frequency points.
+	   Values are separated by white spaces.
+
+       phase, p
+	   Set phase value for every frequency point set by frequency.	Number
+	   of values must be same as number of frequency points.  Values are
+	   separated by white spaces.
+
+       sample_rate, r
+	   Set sample rate, default is 44100.
+
+       nb_samples, n
+	   Set number of samples per each frame. Default is 1024.
+
+       win_func, w
+	   Set window function. Default is blackman.
+
+   anullsrc
+       The null audio source, return unprocessed audio frames. It is mainly
+       useful as a template and to be employed in analysis / debugging tools,
+       or as the source for filters which ignore the input data (for example
+       the sox synth filter).
+
+       This source accepts the following options:
+
+       channel_layout, cl
+	   Specifies the channel layout, and can be either an integer or a
+	   string representing a channel layout. The default value of
+	   channel_layout is "stereo".
+
+	   Check the channel_layout_map definition in
+	   libavutil/channel_layout.c for the mapping between strings and
+	   channel layout values.
+
+       sample_rate, r
+	   Specifies the sample rate, and defaults to 44100.
+
+       nb_samples, n
+	   Set the number of samples per requested frames.
+
+       duration, d
+	   Set the duration of the sourced audio. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the audio
+	   is supposed to be generated forever.
+
+       Examples
+
+       o   Set the sample rate to 48000 Hz and the channel layout to
+	   AV_CH_LAYOUT_MONO.
+
+		   anullsrc=r=48000:cl=4
+
+       o   Do the same operation with a more obvious syntax:
+
+		   anullsrc=r=48000:cl=mono
+
+       All the parameters need to be explicitly defined.
+
+   flite
+       Synthesize a voice utterance using the libflite library.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libflite".
+
+       Note that versions of the flite library prior to 2.0 are not thread-
+       safe.
+
+       The filter accepts the following options:
+
+       list_voices
+	   If set to 1, list the names of the available voices and exit
+	   immediately. Default value is 0.
+
+       nb_samples, n
+	   Set the maximum number of samples per frame. Default value is 512.
+
+       textfile
+	   Set the filename containing the text to speak.
+
+       text
+	   Set the text to speak.
+
+       voice, v
+	   Set the voice to use for the speech synthesis. Default value is
+	   "kal". See also the list_voices option.
+
+       Examples
+
+       o   Read from file speech.txt, and synthesize the text using the
+	   standard flite voice:
+
+		   flite=textfile=speech.txt
+
+       o   Read the specified text selecting the "slt" voice:
+
+		   flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
+
+       o   Input text to ffmpeg:
+
+		   ffmpeg -f lavfi -i flite=text='So fare thee well, poor devil of a Sub-Sub, whose commentator I am':voice=slt
+
+       o   Make ffplay speak the specified text, using "flite" and the "lavfi"
+	   device:
+
+		   ffplay -f lavfi flite=text='No more be grieved for which that thou hast done.'
+
+       For more information about libflite, check:
+       <http://www.festvox.org/flite/>
+
+   anoisesrc
+       Generate a noise audio signal.
+
+       The filter accepts the following options:
+
+       sample_rate, r
+	   Specify the sample rate. Default value is 48000 Hz.
+
+       amplitude, a
+	   Specify the amplitude (0.0 - 1.0) of the generated audio stream.
+	   Default value is 1.0.
+
+       duration, d
+	   Specify the duration of the generated audio stream. Not specifying
+	   this option results in noise with an infinite length.
+
+       color, colour, c
+	   Specify the color of noise. Available noise colors are white, pink,
+	   brown, blue, violet and velvet. Default color is white.
+
+       seed, s
+	   Specify a value used to seed the PRNG.
+
+       nb_samples, n
+	   Set the number of samples per each output frame, default is 1024.
+
+       density
+	   Set the density (0.0 - 1.0) for the velvet noise generator, default
+	   is 0.05.
+
+       Examples
+
+       o   Generate 60 seconds of pink noise, with a 44.1 kHz sampling rate
+	   and an amplitude of 0.5:
+
+		   anoisesrc=d=60:c=pink:r=44100:a=0.5
+
+   hilbert
+       Generate odd-tap Hilbert transform FIR coefficients.
+
+       The resulting stream can be used with afir filter for phase-shifting
+       the signal by 90 degrees.
+
+       This is used in many matrix coding schemes and for analytic signal
+       generation.  The process is often written as a multiplication by i (or
+       j), the imaginary unit.
+
+       The filter accepts the following options:
+
+       sample_rate, s
+	   Set sample rate, default is 44100.
+
+       taps, t
+	   Set length of FIR filter, default is 22051.
+
+       nb_samples, n
+	   Set number of samples per each frame.
+
+       win_func, w
+	   Set window function to be used when generating FIR coefficients.
+
+   sinc
+       Generate a sinc kaiser-windowed low-pass, high-pass, band-pass, or
+       band-reject FIR coefficients.
+
+       The resulting stream can be used with afir filter for filtering the
+       audio signal.
+
+       The filter accepts the following options:
+
+       sample_rate, r
+	   Set sample rate, default is 44100.
+
+       nb_samples, n
+	   Set number of samples per each frame. Default is 1024.
+
+       hp  Set high-pass frequency. Default is 0.
+
+       lp  Set low-pass frequency. Default is 0.  If high-pass frequency is
+	   lower than low-pass frequency and low-pass frequency is higher than
+	   0 then filter will create band-pass filter coefficients, otherwise
+	   band-reject filter coefficients.
+
+       phase
+	   Set filter phase response. Default is 50. Allowed range is from 0
+	   to 100.
+
+       beta
+	   Set Kaiser window beta.
+
+       att Set stop-band attenuation. Default is 120dB, allowed range is from
+	   40 to 180 dB.
+
+       round
+	   Enable rounding, by default is disabled.
+
+       hptaps
+	   Set number of taps for high-pass filter.
+
+       lptaps
+	   Set number of taps for low-pass filter.
+
+   sine
+       Generate an audio signal made of a sine wave with amplitude 1/8.
+
+       The audio signal is bit-exact.
+
+       The filter accepts the following options:
+
+       frequency, f
+	   Set the carrier frequency. Default is 440 Hz.
+
+       beep_factor, b
+	   Enable a periodic beep every second with frequency beep_factor
+	   times the carrier frequency. Default is 0, meaning the beep is
+	   disabled.
+
+       sample_rate, r
+	   Specify the sample rate, default is 44100.
+
+       duration, d
+	   Specify the duration of the generated audio stream.
+
+       samples_per_frame
+	   Set the number of samples per output frame.
+
+	   The expression can contain the following constants:
+
+	   n   The (sequential) number of the output audio frame, starting
+	       from 0.
+
+	   pts The PTS (Presentation TimeStamp) of the output audio frame,
+	       expressed in TB units.
+
+	   t   The PTS of the output audio frame, expressed in seconds.
+
+	   TB  The timebase of the output audio frames.
+
+	   Default is 1024.
+
+       Examples
+
+       o   Generate a simple 440 Hz sine wave:
+
+		   sine
+
+       o   Generate a 220 Hz sine wave with a 880 Hz beep each second, for 5
+	   seconds:
+
+		   sine=220:4:d=5
+		   sine=f=220:b=4:d=5
+		   sine=frequency=220:beep_factor=4:duration=5
+
+       o   Generate a 1 kHz sine wave following "1602,1601,1602,1601,1602"
+	   NTSC pattern:
+
+		   sine=1000:samples_per_frame='st(0,mod(n,5)); 1602-not(not(eq(ld(0),1)+eq(ld(0),3)))'
+
+AUDIO SINKS
+       Below is a description of the currently available audio sinks.
+
+   abuffersink
+       Buffer audio frames, and make them available to the end of filter
+       chain.
+
+       This sink is mainly intended for programmatic use, in particular
+       through the interface defined in libavfilter/buffersink.h or the
+       options system.
+
+       It accepts a pointer to an AVABufferSinkContext structure, which
+       defines the incoming buffers' formats, to be passed as the opaque
+       parameter to "avfilter_init_filter" for initialization.
+
+   anullsink
+       Null audio sink; do absolutely nothing with the input audio. It is
+       mainly useful as a template and for use in analysis / debugging tools.
+
+VIDEO FILTERS
+       When you configure your FFmpeg build, you can disable any of the
+       existing filters using "--disable-filters".  The configure output will
+       show the video filters included in your build.
+
+       Below is a description of the currently available video filters.
+
+   addroi
+       Mark a region of interest in a video frame.
+
+       The frame data is passed through unchanged, but metadata is attached to
+       the frame indicating regions of interest which can affect the behaviour
+       of later encoding.  Multiple regions can be marked by applying the
+       filter multiple times.
+
+       x   Region distance in pixels from the left edge of the frame.
+
+       y   Region distance in pixels from the top edge of the frame.
+
+       w   Region width in pixels.
+
+       h   Region height in pixels.
+
+	   The parameters x, y, w and h are expressions, and may contain the
+	   following variables:
+
+	   iw  Width of the input frame.
+
+	   ih  Height of the input frame.
+
+       qoffset
+	   Quantisation offset to apply within the region.
+
+	   This must be a real value in the range -1 to +1.  A value of zero
+	   indicates no quality change.  A negative value asks for better
+	   quality (less quantisation), while a positive value asks for worse
+	   quality (greater quantisation).
+
+	   The range is calibrated so that the extreme values indicate the
+	   largest possible offset - if the rest of the frame is encoded with
+	   the worst possible quality, an offset of -1 indicates that this
+	   region should be encoded with the best possible quality anyway.
+	   Intermediate values are then interpolated in some codec-dependent
+	   way.
+
+	   For example, in 10-bit H.264 the quantisation parameter varies
+	   between -12 and 51.	A typical qoffset value of -1/10 therefore
+	   indicates that this region should be encoded with a QP around one-
+	   tenth of the full range better than the rest of the frame.  So, if
+	   most of the frame were to be encoded with a QP of around 30, this
+	   region would get a QP of around 24 (an offset of approximately
+	   -1/10 * (51 - -12) = -6.3).	An extreme value of -1 would indicate
+	   that this region should be encoded with the best possible quality
+	   regardless of the treatment of the rest of the frame - that is,
+	   should be encoded at a QP of -12.
+
+       clear
+	   If set to true, remove any existing regions of interest marked on
+	   the frame before adding the new one.
+
+       Examples
+
+       o   Mark the centre quarter of the frame as interesting.
+
+		   addroi=iw/4:ih/4:iw/2:ih/2:-1/10
+
+       o   Mark the 100-pixel-wide region on the left edge of the frame as
+	   very uninteresting (to be encoded at much lower quality than the
+	   rest of the frame).
+
+		   addroi=0:0:100:ih:+1/5
+
+   alphaextract
+       Extract the alpha component from the input as a grayscale video. This
+       is especially useful with the alphamerge filter.
+
+   alphamerge
+       Add or replace the alpha component of the primary input with the
+       grayscale value of a second input. This is intended for use with
+       alphaextract to allow the transmission or storage of frame sequences
+       that have alpha in a format that doesn't support an alpha channel.
+
+       For example, to reconstruct full frames from a normal YUV-encoded video
+       and a separate video created with alphaextract, you might use:
+
+	       movie=in_alpha.mkv [alpha]; [in][alpha] alphamerge [out]
+
+   amplify
+       Amplify differences between current pixel and pixels of adjacent frames
+       in same pixel location.
+
+       This filter accepts the following options:
+
+       radius
+	   Set frame radius. Default is 2. Allowed range is from 1 to 63.  For
+	   example radius of 3 will instruct filter to calculate average of 7
+	   frames.
+
+       factor
+	   Set factor to amplify difference. Default is 2. Allowed range is
+	   from 0 to 65535.
+
+       threshold
+	   Set threshold for difference amplification. Any difference greater
+	   or equal to this value will not alter source pixel. Default is 10.
+	   Allowed range is from 0 to 65535.
+
+       tolerance
+	   Set tolerance for difference amplification. Any difference lower to
+	   this value will not alter source pixel. Default is 0.  Allowed
+	   range is from 0 to 65535.
+
+       low Set lower limit for changing source pixel. Default is 65535.
+	   Allowed range is from 0 to 65535.  This option controls maximum
+	   possible value that will decrease source pixel value.
+
+       high
+	   Set high limit for changing source pixel. Default is 65535. Allowed
+	   range is from 0 to 65535.  This option controls maximum possible
+	   value that will increase source pixel value.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       Commands
+
+       This filter supports the following commands that corresponds to option
+       of same name:
+
+       factor
+       threshold
+       tolerance
+       low
+       high
+       planes
+
+   ass
+       Same as the subtitles filter, except that it doesn't require libavcodec
+       and libavformat to work. On the other hand, it is limited to ASS
+       (Advanced Substation Alpha) subtitles files.
+
+       This filter accepts the following option in addition to the common
+       options from the subtitles filter:
+
+       shaping
+	   Set the shaping engine
+
+	   Available values are:
+
+	   auto
+	       The default libass shaping engine, which is the best available.
+
+	   simple
+	       Fast, font-agnostic shaper that can do only substitutions
+
+	   complex
+	       Slower shaper using OpenType for substitutions and positioning
+
+	   The default is "auto".
+
+   atadenoise
+       Apply an Adaptive Temporal Averaging Denoiser to the video input.
+
+       The filter accepts the following options:
+
+       0a  Set threshold A for 1st plane. Default is 0.02.  Valid range is 0
+	   to 0.3.
+
+       0b  Set threshold B for 1st plane. Default is 0.04.  Valid range is 0
+	   to 5.
+
+       1a  Set threshold A for 2nd plane. Default is 0.02.  Valid range is 0
+	   to 0.3.
+
+       1b  Set threshold B for 2nd plane. Default is 0.04.  Valid range is 0
+	   to 5.
+
+       2a  Set threshold A for 3rd plane. Default is 0.02.  Valid range is 0
+	   to 0.3.
+
+       2b  Set threshold B for 3rd plane. Default is 0.04.  Valid range is 0
+	   to 5.
+
+	   Threshold A is designed to react on abrupt changes in the input
+	   signal and threshold B is designed to react on continuous changes
+	   in the input signal.
+
+       s   Set number of frames filter will use for averaging. Default is 9.
+	   Must be odd number in range [5, 129].
+
+       p   Set what planes of frame filter will use for averaging. Default is
+	   all.
+
+       a   Set what variant of algorithm filter will use for averaging.
+	   Default is "p" parallel.  Alternatively can be set to "s" serial.
+
+	   Parallel can be faster then serial, while other way around is never
+	   true.  Parallel will abort early on first change being greater then
+	   thresholds, while serial will continue processing other side of
+	   frames if they are equal or below thresholds.
+
+       0s
+       1s
+       2s  Set sigma for 1st plane, 2nd plane or 3rd plane. Default is 32767.
+	   Valid range is from 0 to 32767.  This options controls weight for
+	   each pixel in radius defined by size.  Default value means every
+	   pixel have same weight.  Setting this option to 0 effectively
+	   disables filtering.
+
+       Commands
+
+       This filter supports same commands as options except option "s".  The
+       command accepts the same syntax of the corresponding option.
+
+   avgblur
+       Apply average blur filter.
+
+       The filter accepts the following options:
+
+       sizeX
+	   Set horizontal radius size.
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       sizeY
+	   Set vertical radius size, if zero it will be same as "sizeX".
+	   Default is 0.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   backgroundkey
+       Turns a static background into transparency.
+
+       The filter accepts the following option:
+
+       threshold
+	   Threshold for scene change detection.
+
+       similarity
+	   Similarity percentage with the background.
+
+       blend
+	   Set the blend amount for pixels that are not similar.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   bbox
+       Compute the bounding box for the non-black pixels in the input frame
+       luma plane.
+
+       This filter computes the bounding box containing all the pixels with a
+       luma value greater than the minimum allowed value.  The parameters
+       describing the bounding box are printed on the filter log.
+
+       The filter accepts the following option:
+
+       min_val
+	   Set the minimal luma value. Default is 16.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   bilateral
+       Apply bilateral filter, spatial smoothing while preserving edges.
+
+       The filter accepts the following options:
+
+       sigmaS
+	   Set sigma of gaussian function to calculate spatial weight.
+	   Allowed range is 0 to 512. Default is 0.1.
+
+       sigmaR
+	   Set sigma of gaussian function to calculate range weight.  Allowed
+	   range is 0 to 1. Default is 0.1.
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   bilateral_cuda
+       CUDA accelerated bilateral filter, an edge preserving filter.  This
+       filter is mathematically accurate thanks to the use of GPU
+       acceleration.  For best output quality, use one to one chroma
+       subsampling, i.e. yuv444p format.
+
+       The filter accepts the following options:
+
+       sigmaS
+	   Set sigma of gaussian function to calculate spatial weight, also
+	   called sigma space.	Allowed range is 0.1 to 512. Default is 0.1.
+
+       sigmaR
+	   Set sigma of gaussian function to calculate color range weight,
+	   also called sigma color.  Allowed range is 0.1 to 512. Default is
+	   0.1.
+
+       window_size
+	   Set window size of the bilateral function to determine the number
+	   of neighbours to loop on.  If the number entered is even, one will
+	   be added automatically.  Allowed range is 1 to 255. Default is 1.
+
+       Examples
+
+       o   Apply the bilateral filter on a video.
+
+		   ./ffmpeg -v verbose \
+		   -hwaccel cuda -hwaccel_output_format cuda -i input.mp4  \
+		   -init_hw_device cuda \
+		   -filter_complex \
+		   " \
+		   [0:v]scale_cuda=format=yuv444p[scaled_video];
+		   [scaled_video]bilateral_cuda=window_size=9:sigmaS=3.0:sigmaR=50.0" \
+		   -an -sn -c:v h264_nvenc -cq 20 out.mp4
+
+   bitplanenoise
+       Show and measure bit plane noise.
+
+       The filter accepts the following options:
+
+       bitplane
+	   Set which plane to analyze. Default is 1.
+
+       filter
+	   Filter out noisy pixels from "bitplane" set above.  Default is
+	   disabled.
+
+   blackdetect
+       Detect video intervals that are (almost) completely black. Can be
+       useful to detect chapter transitions, commercials, or invalid
+       recordings.
+
+       The filter outputs its detection analysis to both the log as well as
+       frame metadata. If a black segment of at least the specified minimum
+       duration is found, a line with the start and end timestamps as well as
+       duration is printed to the log with level "info". In addition, a log
+       line with level "debug" is printed per frame showing the black amount
+       detected for that frame.
+
+       The filter also attaches metadata to the first frame of a black segment
+       with key "lavfi.black_start" and to the first frame after the black
+       segment ends with key "lavfi.black_end". The value is the frame's
+       timestamp. This metadata is added regardless of the minimum duration
+       specified.
+
+       The filter accepts the following options:
+
+       black_min_duration, d
+	   Set the minimum detected black duration expressed in seconds. It
+	   must be a non-negative floating point number.
+
+	   Default value is 2.0.
+
+       picture_black_ratio_th, pic_th
+	   Set the threshold for considering a picture "black".  Express the
+	   minimum value for the ratio:
+
+		   <nb_black_pixels> / <nb_pixels>
+
+	   for which a picture is considered black.  Default value is 0.98.
+
+       pixel_black_th, pix_th
+	   Set the threshold for considering a pixel "black".
+
+	   The threshold expresses the maximum pixel luma value for which a
+	   pixel is considered "black". The provided value is scaled according
+	   to the following equation:
+
+		   <absolute_threshold> = <luma_minimum_value> + <pixel_black_th> * <luma_range_size>
+
+	   luma_range_size and luma_minimum_value depend on the input video
+	   format, the range is [0-255] for YUV full-range formats and
+	   [16-235] for YUV non full-range formats.
+
+	   Default value is 0.10.
+
+       The following example sets the maximum pixel threshold to the minimum
+       value, and detects only black intervals of 2 or more seconds:
+
+	       blackdetect=d=2:pix_th=0.00
+
+   blackframe
+       Detect frames that are (almost) completely black. Can be useful to
+       detect chapter transitions or commercials. Output lines consist of the
+       frame number of the detected frame, the percentage of blackness, the
+       position in the file if known or -1 and the timestamp in seconds.
+
+       In order to display the output lines, you need to set the loglevel at
+       least to the AV_LOG_INFO value.
+
+       This filter exports frame metadata "lavfi.blackframe.pblack".  The
+       value represents the percentage of pixels in the picture that are below
+       the threshold value.
+
+       It accepts the following parameters:
+
+       amount
+	   The percentage of the pixels that have to be below the threshold;
+	   it defaults to 98.
+
+       threshold, thresh
+	   The threshold below which a pixel value is considered black; it
+	   defaults to 32.
+
+   blend
+       Blend two video frames into each other.
+
+       The "blend" filter takes two input streams and outputs one stream, the
+       first input is the "top" layer and second input is "bottom" layer.  By
+       default, the output terminates when the longest input terminates.
+
+       The "tblend" (time blend) filter takes two consecutive frames from one
+       single stream, and outputs the result obtained by blending the new
+       frame on top of the old frame.
+
+       A description of the accepted options follows.
+
+       c0_mode
+       c1_mode
+       c2_mode
+       c3_mode
+       all_mode
+	   Set blend mode for specific pixel component or all pixel components
+	   in case of all_mode. Default value is "normal".
+
+	   Available values for component modes are:
+
+	   addition
+	   and
+	   average
+	   bleach
+	   burn
+	   darken
+	   difference
+	   divide
+	   dodge
+	   exclusion
+	   extremity
+	   freeze
+	   geometric
+	   glow
+	   grainextract
+	   grainmerge
+	   hardlight
+	   hardmix
+	   hardoverlay
+	   harmonic
+	   heat
+	   interpolate
+	   lighten
+	   linearlight
+	   multiply
+	   multiply128
+	   negation
+	   normal
+	   or
+	   overlay
+	   phoenix
+	   pinlight
+	   reflect
+	   screen
+	   softdifference
+	   softlight
+	   stain
+	   subtract
+	   vividlight
+	   xor
+       c0_opacity
+       c1_opacity
+       c2_opacity
+       c3_opacity
+       all_opacity
+	   Set blend opacity for specific pixel component or all pixel
+	   components in case of all_opacity. Only used in combination with
+	   pixel component blend modes.
+
+       c0_expr
+       c1_expr
+       c2_expr
+       c3_expr
+       all_expr
+	   Set blend expression for specific pixel component or all pixel
+	   components in case of all_expr. Note that related mode options will
+	   be ignored if those are set.
+
+	   The expressions can use the following variables:
+
+	   N   The sequential number of the filtered frame, starting from 0.
+
+	   X
+	   Y   the coordinates of the current sample
+
+	   W
+	   H   the width and height of currently filtered plane
+
+	   SW
+	   SH  Width and height scale for the plane being filtered. It is the
+	       ratio between the dimensions of the current plane to the luma
+	       plane, e.g. for a "yuv420p" frame, the values are "1,1" for the
+	       luma plane and "0.5,0.5" for the chroma planes.
+
+	   T   Time of the current frame, expressed in seconds.
+
+	   TOP, A
+	       Value of pixel component at current location for first video
+	       frame (top layer).
+
+	   BOTTOM, B
+	       Value of pixel component at current location for second video
+	       frame (bottom layer).
+
+       The "blend" filter also supports the framesync options.
+
+       Examples
+
+       o   Apply transition from bottom layer to top layer in first 10
+	   seconds:
+
+		   blend=all_expr='A*(if(gte(T,10),1,T/10))+B*(1-(if(gte(T,10),1,T/10)))'
+
+       o   Apply linear horizontal transition from top layer to bottom layer:
+
+		   blend=all_expr='A*(X/W)+B*(1-X/W)'
+
+       o   Apply 1x1 checkerboard effect:
+
+		   blend=all_expr='if(eq(mod(X,2),mod(Y,2)),A,B)'
+
+       o   Apply uncover left effect:
+
+		   blend=all_expr='if(gte(N*SW+X,W),A,B)'
+
+       o   Apply uncover down effect:
+
+		   blend=all_expr='if(gte(Y-N*SH,0),A,B)'
+
+       o   Apply uncover up-left effect:
+
+		   blend=all_expr='if(gte(T*SH*40+Y,H)*gte((T*40*SW+X)*W/H,W),A,B)'
+
+       o   Split diagonally video and shows top and bottom layer on each side:
+
+		   blend=all_expr='if(gt(X,Y*(W/H)),A,B)'
+
+       o   Display differences between the current and the previous frame:
+
+		   tblend=all_mode=grainextract
+
+       Commands
+
+       This filter supports same commands as options.
+
+   blockdetect
+       Determines blockiness of frames without altering the input frames.
+
+       Based on Remco Muijs and Ihor Kirenko: "A no-reference blocking
+       artifact measure for adaptive video processing." 2005 13th European
+       signal processing conference.
+
+       The filter accepts the following options:
+
+       period_min
+       period_max
+	   Set minimum and maximum values for determining pixel grids
+	   (periods).  Default values are [3,24].
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Examples
+
+       o   Determine blockiness for the first plane and search for periods
+	   within [8,32]:
+
+		   blockdetect=period_min=8:period_max=32:planes=1
+
+   blurdetect
+       Determines blurriness of frames without altering the input frames.
+
+       Based on Marziliano, Pina, et al. "A no-reference perceptual blur
+       metric."  Allows for a block-based abbreviation.
+
+       The filter accepts the following options:
+
+       low
+       high
+	   Set low and high threshold values used by the Canny thresholding
+	   algorithm.
+
+	   The high threshold selects the "strong" edge pixels, which are then
+	   connected through 8-connectivity with the "weak" edge pixels
+	   selected by the low threshold.
+
+	   low and high threshold values must be chosen in the range [0,1],
+	   and low should be lesser or equal to high.
+
+	   Default value for low is "20/255", and default value for high is
+	   "50/255".
+
+       radius
+	   Define the radius to search around an edge pixel for local maxima.
+
+       block_pct
+	   Determine blurriness only for the most significant blocks, given in
+	   percentage.
+
+       block_width
+	   Determine blurriness for blocks of width block_width. If set to any
+	   value smaller 1, no blocks are used and the whole image is
+	   processed as one no matter of block_height.
+
+       block_height
+	   Determine blurriness for blocks of height block_height. If set to
+	   any value smaller 1, no blocks are used and the whole image is
+	   processed as one no matter of block_width.
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Examples
+
+       o   Determine blur for 80% of most significant 32x32 blocks:
+
+		   blurdetect=block_width=32:block_height=32:block_pct=80
+
+   bm3d
+       Denoise frames using Block-Matching 3D algorithm.
+
+       The filter accepts the following options.
+
+       sigma
+	   Set denoising strength. Default value is 1.	Allowed range is from
+	   0 to 999.9.	The denoising algorithm is very sensitive to sigma, so
+	   adjust it according to the source.
+
+       block
+	   Set local patch size. This sets dimensions in 2D.
+
+       bstep
+	   Set sliding step for processing blocks. Default value is 4.
+	   Allowed range is from 1 to 64.  Smaller values allows processing
+	   more reference blocks and is slower.
+
+       group
+	   Set maximal number of similar blocks for 3rd dimension. Default
+	   value is 1.	When set to 1, no block matching is done. Larger
+	   values allows more blocks in single group.  Allowed range is from 1
+	   to 256.
+
+       range
+	   Set radius for search block matching. Default is 9.	Allowed range
+	   is from 1 to INT32_MAX.
+
+       mstep
+	   Set step between two search locations for block matching. Default
+	   is 1.  Allowed range is from 1 to 64. Smaller is slower.
+
+       thmse
+	   Set threshold of mean square error for block matching. Valid range
+	   is 0 to INT32_MAX.
+
+       hdthr
+	   Set thresholding parameter for hard thresholding in 3D transformed
+	   domain.  Larger values results in stronger hard-thresholding
+	   filtering in frequency domain.
+
+       estim
+	   Set filtering estimation mode. Can be "basic" or "final".  Default
+	   is "basic".
+
+       ref If enabled, filter will use 2nd stream for block matching.  Default
+	   is disabled for "basic" value of estim option, and always enabled
+	   if value of estim is "final".
+
+       planes
+	   Set planes to filter. Default is all available except alpha.
+
+       Examples
+
+       o   Basic filtering with bm3d:
+
+		   bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic
+
+       o   Same as above, but filtering only luma:
+
+		   bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic:planes=1
+
+       o   Same as above, but with both estimation modes:
+
+		   split[a][b],[a]bm3d=sigma=3:block=4:bstep=2:group=1:estim=basic[a],[b][a]bm3d=sigma=3:block=4:bstep=2:group=16:estim=final:ref=1
+
+       o   Same as above, but prefilter with nlmeans filter instead:
+
+		   split[a][b],[a]nlmeans=s=3:r=7:p=3[a],[b][a]bm3d=sigma=3:block=4:bstep=2:group=16:estim=final:ref=1
+
+   boxblur
+       Apply a boxblur algorithm to the input video.
+
+       It accepts the following parameters:
+
+       luma_radius, lr
+       luma_power, lp
+       chroma_radius, cr
+       chroma_power, cp
+       alpha_radius, ar
+       alpha_power, ap
+
+       A description of the accepted options follows.
+
+       luma_radius, lr
+       chroma_radius, cr
+       alpha_radius, ar
+	   Set an expression for the box radius in pixels used for blurring
+	   the corresponding input plane.
+
+	   The radius value must be a non-negative number, and must not be
+	   greater than the value of the expression "min(w,h)/2" for the luma
+	   and alpha planes, and of "min(cw,ch)/2" for the chroma planes.
+
+	   Default value for luma_radius is "2". If not specified,
+	   chroma_radius and alpha_radius default to the corresponding value
+	   set for luma_radius.
+
+	   The expressions can contain the following constants:
+
+	   w
+	   h   The input width and height in pixels.
+
+	   cw
+	   ch  The input chroma image width and height in pixels.
+
+	   hsub
+	   vsub
+	       The horizontal and vertical chroma subsample values. For
+	       example, for the pixel format "yuv422p", hsub is 2 and vsub is
+	       1.
+
+       luma_power, lp
+       chroma_power, cp
+       alpha_power, ap
+	   Specify how many times the boxblur filter is applied to the
+	   corresponding plane.
+
+	   Default value for luma_power is 2. If not specified, chroma_power
+	   and alpha_power default to the corresponding value set for
+	   luma_power.
+
+	   A value of 0 will disable the effect.
+
+       Examples
+
+       o   Apply a boxblur filter with the luma, chroma, and alpha radii set
+	   to 2:
+
+		   boxblur=luma_radius=2:luma_power=1
+		   boxblur=2:1
+
+       o   Set the luma radius to 2, and alpha and chroma radius to 0:
+
+		   boxblur=2:1:cr=0:ar=0
+
+       o   Set the luma and chroma radii to a fraction of the video dimension:
+
+		   boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chroma_power=1
+
+   bwdif
+       Deinterlace the input video ("bwdif" stands for "Bob Weaver
+       Deinterlacing Filter").
+
+       Motion adaptive deinterlacing based on yadif with the use of w3fdif and
+       cubic interpolation algorithms.	It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   The default value is "send_field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   bwdif_cuda
+       Deinterlace the input video using the bwdif algorithm, but implemented
+       in CUDA so that it can work as part of a GPU accelerated pipeline with
+       nvdec and/or nvenc.
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   The default value is "send_field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   ccrepack
+       Repack CEA-708 closed captioning side data
+
+       This filter fixes various issues seen with commerical encoders related
+       to upstream malformed CEA-708 payloads, specifically incorrect number
+       of tuples (wrong cc_count for the target FPS), and incorrect ordering
+       of tuples (i.e. the CEA-608 tuples are not at the first entries in the
+       payload).
+
+   cas
+       Apply Contrast Adaptive Sharpen filter to video stream.
+
+       The filter accepts the following options:
+
+       strength
+	   Set the sharpening strength. Default value is 0.
+
+       planes
+	   Set planes to filter. Default value is to filter all planes except
+	   alpha plane.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   chromahold
+       Remove all color information for all colors except for certain one.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will not be replaced with neutral chroma.
+
+       similarity
+	   Similarity percentage with the above color.	0.01 matches only the
+	   exact key color, while 1.0 matches everything.
+
+       blend
+	   Blend percentage.  0.0 makes pixels either fully gray, or not gray
+	   at all.  Higher values result in more preserved color.
+
+       yuv Signals that the color passed is already in YUV instead of RGB.
+
+	   Literal colors like "green" or "red" don't make sense with this
+	   enabled anymore.  This can be used to pass exact YUV values as
+	   hexadecimal numbers.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   chromakey
+       YUV colorspace color/chroma keying.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will be replaced with transparency.
+
+       similarity
+	   Similarity percentage with the key color.
+
+	   0.01 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.
+
+	   0.0 makes pixels either fully transparent, or not transparent at
+	   all.
+
+	   Higher values result in semi-transparent pixels, with a higher
+	   transparency the more similar the pixels color is to the key color.
+
+       yuv Signals that the color passed is already in YUV instead of RGB.
+
+	   Literal colors like "green" or "red" don't make sense with this
+	   enabled anymore.  This can be used to pass exact YUV values as
+	   hexadecimal numbers.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+       Examples
+
+       o   Make every green pixel in the input image transparent:
+
+		   ffmpeg -i input.png -vf chromakey=green out.png
+
+       o   Overlay a greenscreen-video on top of a static black background.
+
+		   ffmpeg -f lavfi -i color=c=black:s=1280x720 -i video.mp4 -shortest -filter_complex "[1:v]chromakey=0x70de77:0.1:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.mkv
+
+   chromakey_cuda
+       CUDA accelerated YUV colorspace color/chroma keying.
+
+       This filter works like normal chromakey filter but operates on CUDA
+       frames.	for more details and parameters see chromakey.
+
+       Examples
+
+       o   Make all the green pixels in the input video transparent and use it
+	   as an overlay for another video:
+
+		   ./ffmpeg \
+		       -hwaccel cuda -hwaccel_output_format cuda -i input_green.mp4  \
+		       -hwaccel cuda -hwaccel_output_format cuda -i base_video.mp4 \
+		       -init_hw_device cuda \
+		       -filter_complex \
+		       " \
+			   [0:v]chromakey_cuda=0x25302D:0.1:0.12:1[overlay_video]; \
+			   [1:v]scale_cuda=format=yuv420p[base]; \
+			   [base][overlay_video]overlay_cuda" \
+		       -an -sn -c:v h264_nvenc -cq 20 output.mp4
+
+       o   Process two software sources, explicitly uploading the frames:
+
+		   ./ffmpeg -init_hw_device cuda=cuda -filter_hw_device cuda \
+		       -f lavfi -i color=size=800x600:color=white,format=yuv420p \
+		       -f lavfi -i yuvtestsrc=size=200x200,format=yuv420p \
+		       -filter_complex \
+		       " \
+			   [0]hwupload[under]; \
+			   [1]hwupload,chromakey_cuda=green:0.1:0.12[over]; \
+			   [under][over]overlay_cuda" \
+		       -c:v hevc_nvenc -cq 18 -preset slow output.mp4
+
+   chromanr
+       Reduce chrominance noise.
+
+       The filter accepts the following options:
+
+       thres
+	   Set threshold for averaging chrominance values.  Sum of absolute
+	   difference of Y, U and V pixel components of current pixel and
+	   neighbour pixels lower than this threshold will be used in
+	   averaging. Luma component is left unchanged and is copied to
+	   output.  Default value is 30. Allowed range is from 1 to 200.
+
+       sizew
+	   Set horizontal radius of rectangle used for averaging.  Allowed
+	   range is from 1 to 100. Default value is 5.
+
+       sizeh
+	   Set vertical radius of rectangle used for averaging.  Allowed range
+	   is from 1 to 100. Default value is 5.
+
+       stepw
+	   Set horizontal step when averaging. Default value is 1.  Allowed
+	   range is from 1 to 50.  Mostly useful to speed-up filtering.
+
+       steph
+	   Set vertical step when averaging. Default value is 1.  Allowed
+	   range is from 1 to 50.  Mostly useful to speed-up filtering.
+
+       threy
+	   Set Y threshold for averaging chrominance values.  Set finer
+	   control for max allowed difference between Y components of current
+	   pixel and neigbour pixels.  Default value is 200. Allowed range is
+	   from 1 to 200.
+
+       threu
+	   Set U threshold for averaging chrominance values.  Set finer
+	   control for max allowed difference between U components of current
+	   pixel and neigbour pixels.  Default value is 200. Allowed range is
+	   from 1 to 200.
+
+       threv
+	   Set V threshold for averaging chrominance values.  Set finer
+	   control for max allowed difference between V components of current
+	   pixel and neigbour pixels.  Default value is 200. Allowed range is
+	   from 1 to 200.
+
+       distance
+	   Set distance type used in calculations.
+
+	   manhattan
+	       Absolute difference.
+
+	   euclidean
+	       Difference squared.
+
+	   Default distance type is manhattan.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+   chromashift
+       Shift chroma pixels horizontally and/or vertically.
+
+       The filter accepts the following options:
+
+       cbh Set amount to shift chroma-blue horizontally.
+
+       cbv Set amount to shift chroma-blue vertically.
+
+       crh Set amount to shift chroma-red horizontally.
+
+       crv Set amount to shift chroma-red vertically.
+
+       edge
+	   Set edge mode, can be smear, default, or warp.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   ciescope
+       Display CIE color diagram with pixels overlaid onto it.
+
+       The filter accepts the following options:
+
+       system
+	   Set color system.
+
+	   ntsc, 470m
+	   ebu, 470bg
+	   smpte
+	   240m
+	   apple
+	   widergb
+	   cie1931
+	   rec709, hdtv
+	   uhdtv, rec2020
+	   dcip3
+       cie Set CIE system.
+
+	   xyy
+	   ucs
+	   luv
+       gamuts
+	   Set what gamuts to draw.
+
+	   See "system" option for available values.
+
+       size, s
+	   Set ciescope size, by default set to 512.
+
+       intensity, i
+	   Set intensity used to map input pixel values to CIE diagram.
+
+       contrast
+	   Set contrast used to draw tongue colors that are out of active
+	   color system gamut.
+
+       corrgamma
+	   Correct gamma displayed on scope, by default enabled.
+
+       showwhite
+	   Show white point on CIE diagram, by default disabled.
+
+       gamma
+	   Set input gamma. Used only with XYZ input color space.
+
+       fill
+	   Fill with CIE colors. By default is enabled.
+
+   codecview
+       Visualize information exported by some codecs.
+
+       Some codecs can export information through frames using side-data or
+       other means. For example, some MPEG based codecs export motion vectors
+       through the export_mvs flag in the codec flags2 option.
+
+       The filter accepts the following option:
+
+       block
+	   Display block partition structure using the luma plane.
+
+       mv  Set motion vectors to visualize.
+
+	   Available flags for mv are:
+
+	   pf  forward predicted MVs of P-frames
+
+	   bf  forward predicted MVs of B-frames
+
+	   bb  backward predicted MVs of B-frames
+
+       qp  Display quantization parameters using the chroma planes.
+
+       mv_type, mvt
+	   Set motion vectors type to visualize. Includes MVs from all frames
+	   unless specified by frame_type option.
+
+	   Available flags for mv_type are:
+
+	   fp  forward predicted MVs
+
+	   bp  backward predicted MVs
+
+       frame_type, ft
+	   Set frame type to visualize motion vectors of.
+
+	   Available flags for frame_type are:
+
+	   if  intra-coded frames (I-frames)
+
+	   pf  predicted frames (P-frames)
+
+	   bf  bi-directionally predicted frames (B-frames)
+
+       Examples
+
+       o   Visualize forward predicted MVs of all frames using ffplay:
+
+		   ffplay -flags2 +export_mvs input.mp4 -vf codecview=mv_type=fp
+
+       o   Visualize multi-directionals MVs of P and B-Frames using ffplay:
+
+		   ffplay -flags2 +export_mvs input.mp4 -vf codecview=mv=pf+bf+bb
+
+   colorbalance
+       Modify intensity of primary colors (red, green and blue) of input
+       frames.
+
+       The filter allows an input frame to be adjusted in the shadows,
+       midtones or highlights regions for the red-cyan, green-magenta or blue-
+       yellow balance.
+
+       A positive adjustment value shifts the balance towards the primary
+       color, a negative value towards the complementary color.
+
+       The filter accepts the following options:
+
+       rs
+       gs
+       bs  Adjust red, green and blue shadows (darkest pixels).
+
+       rm
+       gm
+       bm  Adjust red, green and blue midtones (medium pixels).
+
+       rh
+       gh
+       bh  Adjust red, green and blue highlights (brightest pixels).
+
+	   Allowed ranges for options are "[-1.0, 1.0]". Defaults are 0.
+
+       pl  Preserve lightness when changing color balance. Default is
+	   disabled.
+
+       Examples
+
+       o   Add red color cast to shadows:
+
+		   colorbalance=rs=.3
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorcontrast
+       Adjust color contrast between RGB components.
+
+       The filter accepts the following options:
+
+       rc  Set the red-cyan contrast. Defaults is 0.0. Allowed range is from
+	   -1.0 to 1.0.
+
+       gm  Set the green-magenta contrast. Defaults is 0.0. Allowed range is
+	   from -1.0 to 1.0.
+
+       by  Set the blue-yellow contrast. Defaults is 0.0. Allowed range is
+	   from -1.0 to 1.0.
+
+       rcw
+       gmw
+       byw Set the weight of each "rc", "gm", "by" option value. Default value
+	   is 0.0.  Allowed range is from 0.0 to 1.0. If all weights are 0.0
+	   filtering is disabled.
+
+       pl  Set the amount of preserving lightness. Default value is 0.0.
+	   Allowed range is from 0.0 to 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorcorrect
+       Adjust color white balance selectively for blacks and whites.  This
+       filter operates in YUV colorspace.
+
+       The filter accepts the following options:
+
+       rl  Set the red shadow spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       bl  Set the blue shadow spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       rh  Set the red highlight spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       bh  Set the blue highlight spot. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       saturation
+	   Set the amount of saturation. Allowed range is from -3.0 to 3.0.
+	   Default value is 1.
+
+       analyze
+	   If set to anything other than "manual" it will analyze every frame
+	   and use derived parameters for filtering output frame.
+
+	   Possible values are:
+
+	   manual
+	   average
+	   minmax
+	   median
+
+	   Default value is "manual".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorchannelmixer
+       Adjust video input frames by re-mixing color channels.
+
+       This filter modifies a color channel by adding the values associated to
+       the other channels of the same pixels. For example if the value to
+       modify is red, the output value will be:
+
+	       <red>=<red>*<rr> + <blue>*<rb> + <green>*<rg> + <alpha>*<ra>
+
+       The filter accepts the following options:
+
+       rr
+       rg
+       rb
+       ra  Adjust contribution of input red, green, blue and alpha channels
+	   for output red channel.  Default is 1 for rr, and 0 for rg, rb and
+	   ra.
+
+       gr
+       gg
+       gb
+       ga  Adjust contribution of input red, green, blue and alpha channels
+	   for output green channel.  Default is 1 for gg, and 0 for gr, gb
+	   and ga.
+
+       br
+       bg
+       bb
+       ba  Adjust contribution of input red, green, blue and alpha channels
+	   for output blue channel.  Default is 1 for bb, and 0 for br, bg and
+	   ba.
+
+       ar
+       ag
+       ab
+       aa  Adjust contribution of input red, green, blue and alpha channels
+	   for output alpha channel.  Default is 1 for aa, and 0 for ar, ag
+	   and ab.
+
+	   Allowed ranges for options are "[-2.0, 2.0]".
+
+       pc  Set preserve color mode. The accepted values are:
+
+	   none
+	       Disable color preserving, this is default.
+
+	   lum Preserve luminance.
+
+	   max Preserve max value of RGB triplet.
+
+	   avg Preserve average value of RGB triplet.
+
+	   sum Preserve sum value of RGB triplet.
+
+	   nrm Preserve normalized value of RGB triplet.
+
+	   pwr Preserve power value of RGB triplet.
+
+       pa  Set the preserve color amount when changing colors. Allowed range
+	   is from "[0.0, 1.0]".  Default is 0.0, thus disabled.
+
+       Examples
+
+       o   Convert source to grayscale:
+
+		   colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3
+
+       o   Simulate sepia tones:
+
+		   colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorize
+       Overlay a solid color on the video stream.
+
+       The filter accepts the following options:
+
+       hue Set the color hue. Allowed range is from 0 to 360.  Default value
+	   is 0.
+
+       saturation
+	   Set the color saturation. Allowed range is from 0 to 1.  Default
+	   value is 0.5.
+
+       lightness
+	   Set the color lightness. Allowed range is from 0 to 1.  Default
+	   value is 0.5.
+
+       mix Set the mix of source lightness. By default is set to 1.0.  Allowed
+	   range is from 0.0 to 1.0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colorkey
+       RGB colorspace color keying.  This filter operates on 8-bit RGB format
+       frames by setting the alpha component of each pixel which falls within
+       the similarity radius of the key color to 0. The alpha value for pixels
+       outside the similarity radius depends on the value of the blend option.
+
+       The filter accepts the following options:
+
+       color
+	   Set the color for which alpha will be set to 0 (full transparency).
+	   See "Color" section in the ffmpeg-utils manual.  Default is
+	   "black".
+
+       similarity
+	   Set the radius from the key color within which other colors also
+	   have full transparency.  The computed distance is related to the
+	   unit fractional distance in 3D space between the RGB values of the
+	   key color and the pixel's color. Range is 0.01 to 1.0. 0.01 matches
+	   within a very small radius around the exact key color, while 1.0
+	   matches everything.	Default is 0.01.
+
+       blend
+	   Set how the alpha value for pixels that fall outside the similarity
+	   radius is computed.	0.0 makes pixels either fully transparent or
+	   fully opaque.  Higher values result in semi-transparent pixels,
+	   with greater transparency the more similar the pixel color is to
+	   the key color.  Range is 0.0 to 1.0. Default is 0.0.
+
+       Examples
+
+       o   Make every green pixel in the input image transparent:
+
+		   ffmpeg -i input.png -vf colorkey=green out.png
+
+       o   Overlay a greenscreen-video on top of a static background image.
+
+		   ffmpeg -i background.png -i video.mp4 -filter_complex "[1:v]colorkey=0x3BBD1E:0.3:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.flv
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   colorhold
+       Remove all color information for all RGB colors except for certain one.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will not be replaced with neutral gray.
+
+       similarity
+	   Similarity percentage with the above color.	0.01 matches only the
+	   exact key color, while 1.0 matches everything.
+
+       blend
+	   Blend percentage. 0.0 makes pixels fully gray.  Higher values
+	   result in more preserved color.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   colorlevels
+       Adjust video input frames using levels.
+
+       The filter accepts the following options:
+
+       rimin
+       gimin
+       bimin
+       aimin
+	   Adjust red, green, blue and alpha input black point.  Allowed
+	   ranges for options are "[-1.0, 1.0]". Defaults are 0.
+
+       rimax
+       gimax
+       bimax
+       aimax
+	   Adjust red, green, blue and alpha input white point.  Allowed
+	   ranges for options are "[-1.0, 1.0]". Defaults are 1.
+
+	   Input levels are used to lighten highlights (bright tones), darken
+	   shadows (dark tones), change the balance of bright and dark tones.
+
+       romin
+       gomin
+       bomin
+       aomin
+	   Adjust red, green, blue and alpha output black point.  Allowed
+	   ranges for options are "[0, 1.0]". Defaults are 0.
+
+       romax
+       gomax
+       bomax
+       aomax
+	   Adjust red, green, blue and alpha output white point.  Allowed
+	   ranges for options are "[0, 1.0]". Defaults are 1.
+
+	   Output levels allows manual selection of a constrained output level
+	   range.
+
+       preserve
+	   Set preserve color mode. The accepted values are:
+
+	   none
+	       Disable color preserving, this is default.
+
+	   lum Preserve luminance.
+
+	   max Preserve max value of RGB triplet.
+
+	   avg Preserve average value of RGB triplet.
+
+	   sum Preserve sum value of RGB triplet.
+
+	   nrm Preserve normalized value of RGB triplet.
+
+	   pwr Preserve power value of RGB triplet.
+
+       Examples
+
+       o   Make video output darker:
+
+		   colorlevels=rimin=0.058:gimin=0.058:bimin=0.058
+
+       o   Increase contrast:
+
+		   colorlevels=rimin=0.039:gimin=0.039:bimin=0.039:rimax=0.96:gimax=0.96:bimax=0.96
+
+       o   Make video output lighter:
+
+		   colorlevels=rimax=0.902:gimax=0.902:bimax=0.902
+
+       o   Increase brightness:
+
+		   colorlevels=romin=0.5:gomin=0.5:bomin=0.5
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   colormap
+       Apply custom color maps to video stream.
+
+       This filter needs three input video streams.  First stream is video
+       stream that is going to be filtered out.  Second and third video stream
+       specify color patches for source color to target color mapping.
+
+       The filter accepts the following options:
+
+       patch_size
+	   Set the source and target video stream patch size in pixels.
+
+       nb_patches
+	   Set the max number of used patches from source and target video
+	   stream.  Default value is number of patches available in additional
+	   video streams.  Max allowed number of patches is 64.
+
+       type
+	   Set the adjustments used for target colors. Can be "relative" or
+	   "absolute".	Defaults is "absolute".
+
+       kernel
+	   Set the kernel used to measure color differences between mapped
+	   colors.
+
+	   The accepted values are:
+
+	   euclidean
+	   weuclidean
+
+	   Default is "euclidean".
+
+   colormatrix
+       Convert color matrix.
+
+       The filter accepts the following options:
+
+       src
+       dst Specify the source and destination color matrix. Both values must
+	   be specified.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt601
+	       BT.601
+
+	   bt470
+	       BT.470
+
+	   bt470bg
+	       BT.470BG
+
+	   smpte170m
+	       SMPTE-170M
+
+	   smpte240m
+	       SMPTE-240M
+
+	   bt2020
+	       BT.2020
+
+       For example to convert from BT.601 to SMPTE-240M, use the command:
+
+	       colormatrix=bt601:smpte240m
+
+   colorspace
+       Convert colorspace, transfer characteristics or color primaries.  Input
+       video needs to have an even size.
+
+       The filter accepts the following options:
+
+       all Specify all color properties at once.
+
+	   The accepted values are:
+
+	   bt470m
+	       BT.470M
+
+	   bt470bg
+	       BT.470BG
+
+	   bt601-6-525
+	       BT.601-6 525
+
+	   bt601-6-625
+	       BT.601-6 625
+
+	   bt709
+	       BT.709
+
+	   smpte170m
+	       SMPTE-170M
+
+	   smpte240m
+	       SMPTE-240M
+
+	   bt2020
+	       BT.2020
+
+       space
+	   Specify output colorspace.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt470bg
+	       BT.470BG or BT.601-6 625
+
+	   smpte170m
+	       SMPTE-170M or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   ycgco
+	       YCgCo
+
+	   bt2020ncl
+	       BT.2020 with non-constant luminance
+
+       trc Specify output transfer characteristics.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   bt470m
+	       BT.470M
+
+	   bt470bg
+	       BT.470BG
+
+	   gamma22
+	       Constant gamma of 2.2
+
+	   gamma28
+	       Constant gamma of 2.8
+
+	   smpte170m
+	       SMPTE-170M, BT.601-6 625 or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   srgb
+	       SRGB
+
+	   iec61966-2-1
+	       iec61966-2-1
+
+	   iec61966-2-4
+	       iec61966-2-4
+
+	   xvycc
+	       xvycc
+
+	   bt2020-10
+	       BT.2020 for 10-bits content
+
+	   bt2020-12
+	       BT.2020 for 12-bits content
+
+       primaries
+	   Specify output color primaries.
+
+	   The accepted values are:
+
+	   bt709
+	       BT.709
+
+	   bt470m
+	       BT.470M
+
+	   bt470bg
+	       BT.470BG or BT.601-6 625
+
+	   smpte170m
+	       SMPTE-170M or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   film
+	       film
+
+	   smpte431
+	       SMPTE-431
+
+	   smpte432
+	       SMPTE-432
+
+	   bt2020
+	       BT.2020
+
+	   jedec-p22
+	       JEDEC P22 phosphors
+
+       range
+	   Specify output color range.
+
+	   The accepted values are:
+
+	   tv  TV (restricted) range
+
+	   mpeg
+	       MPEG (restricted) range
+
+	   pc  PC (full) range
+
+	   jpeg
+	       JPEG (full) range
+
+       format
+	   Specify output color format.
+
+	   The accepted values are:
+
+	   yuv420p
+	       YUV 4:2:0 planar 8-bits
+
+	   yuv420p10
+	       YUV 4:2:0 planar 10-bits
+
+	   yuv420p12
+	       YUV 4:2:0 planar 12-bits
+
+	   yuv422p
+	       YUV 4:2:2 planar 8-bits
+
+	   yuv422p10
+	       YUV 4:2:2 planar 10-bits
+
+	   yuv422p12
+	       YUV 4:2:2 planar 12-bits
+
+	   yuv444p
+	       YUV 4:4:4 planar 8-bits
+
+	   yuv444p10
+	       YUV 4:4:4 planar 10-bits
+
+	   yuv444p12
+	       YUV 4:4:4 planar 12-bits
+
+       fast
+	   Do a fast conversion, which skips gamma/primary correction. This
+	   will take significantly less CPU, but will be mathematically
+	   incorrect. To get output compatible with that produced by the
+	   colormatrix filter, use fast=1.
+
+       dither
+	   Specify dithering mode.
+
+	   The accepted values are:
+
+	   none
+	       No dithering
+
+	   fsb Floyd-Steinberg dithering
+
+       wpadapt
+	   Whitepoint adaptation mode.
+
+	   The accepted values are:
+
+	   bradford
+	       Bradford whitepoint adaptation
+
+	   vonkries
+	       von Kries whitepoint adaptation
+
+	   identity
+	       identity whitepoint adaptation (i.e. no whitepoint adaptation)
+
+       iall
+	   Override all input properties at once. Same accepted values as all.
+
+       ispace
+	   Override input colorspace. Same accepted values as space.
+
+       iprimaries
+	   Override input color primaries. Same accepted values as primaries.
+
+       itrc
+	   Override input transfer characteristics. Same accepted values as
+	   trc.
+
+       irange
+	   Override input color range. Same accepted values as range.
+
+       The filter converts the transfer characteristics, color space and color
+       primaries to the specified user values. The output value, if not
+       specified, is set to a default value based on the "all" property. If
+       that property is also not specified, the filter will log an error. The
+       output color range and format default to the same value as the input
+       color range and format. The input transfer characteristics, color
+       space, color primaries and color range should be set on the input data.
+       If any of these are missing, the filter will log an error and no
+       conversion will take place.
+
+       For example to convert the input to SMPTE-240M, use the command:
+
+	       colorspace=smpte240m
+
+   colorspace_cuda
+       CUDA accelerated implementation of the colorspace filter.
+
+       It is by no means feature complete compared to the software colorspace
+       filter, and at the current time only supports color range conversion
+       between jpeg/full and mpeg/limited range.
+
+       The filter accepts the following options:
+
+       range
+	   Specify output color range.
+
+	   The accepted values are:
+
+	   tv  TV (restricted) range
+
+	   mpeg
+	       MPEG (restricted) range
+
+	   pc  PC (full) range
+
+	   jpeg
+	       JPEG (full) range
+
+   colortemperature
+       Adjust color temperature in video to simulate variations in ambient
+       color temperature.
+
+       The filter accepts the following options:
+
+       temperature
+	   Set the temperature in Kelvin. Allowed range is from 1000 to 40000.
+	   Default value is 6500 K.
+
+       mix Set mixing with filtered output. Allowed range is from 0 to 1.
+	   Default value is 1.
+
+       pl  Set the amount of preserving lightness. Allowed range is from 0 to
+	   1.  Default value is 0.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   convolution
+       Apply convolution of 3x3, 5x5, 7x7 or horizontal/vertical up to 49
+       elements.
+
+       The filter accepts the following options:
+
+       0m
+       1m
+       2m
+       3m  Set matrix for each plane.  Matrix is sequence of 9, 25 or 49
+	   signed integers in square mode, and from 1 to 49 odd number of
+	   signed integers in row mode.
+
+       0rdiv
+       1rdiv
+       2rdiv
+       3rdiv
+	   Set multiplier for calculated value for each plane.	If unset or 0,
+	   it will be 1/sum of all matrix elements.
+
+       0bias
+       1bias
+       2bias
+       3bias
+	   Set bias for each plane. This value is added to the result of the
+	   multiplication.  Useful for making the overall image brighter or
+	   darker. Default is 0.0.
+
+       0mode
+       1mode
+       2mode
+       3mode
+	   Set matrix mode for each plane. Can be square, row or column.
+	   Default is square.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Apply sharpen:
+
+		   convolution="0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0"
+
+       o   Apply blur:
+
+		   convolution="1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1/9:1/9:1/9:1/9"
+
+       o   Apply edge enhance:
+
+		   convolution="0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128"
+
+       o   Apply edge detect:
+
+		   convolution="0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128"
+
+       o   Apply laplacian edge detector which includes diagonals:
+
+		   convolution="1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:5:5:5:1:0:128:128:0"
+
+       o   Apply emboss:
+
+		   convolution="-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2"
+
+   convolve
+       Apply 2D convolution of video stream in frequency domain using second
+       stream as impulse.
+
+       The filter accepts the following options:
+
+       planes
+	   Set which planes to process.
+
+       impulse
+	   Set which impulse video frames will be processed, can be first or
+	   all. Default is all.
+
+       The "convolve" filter also supports the framesync options.
+
+   copy
+       Copy the input video source unchanged to the output. This is mainly
+       useful for testing purposes.
+
+   coreimage
+       Video filtering on GPU using Apple's CoreImage API on OSX.
+
+       Hardware acceleration is based on an OpenGL context. Usually, this
+       means it is processed by video hardware. However, software-based OpenGL
+       implementations exist which means there is no guarantee for hardware
+       processing. It depends on the respective OSX.
+
+       There are many filters and image generators provided by Apple that come
+       with a large variety of options. The filter has to be referenced by its
+       name along with its options.
+
+       The coreimage filter accepts the following options:
+
+       list_filters
+	   List all available filters and generators along with all their
+	   respective options as well as possible minimum and maximum values
+	   along with the default values.
+
+		   list_filters=true
+
+       filter
+	   Specify all filters by their respective name and options.  Use
+	   list_filters to determine all valid filter names and options.
+	   Numerical options are specified by a float value and are
+	   automatically clamped to their respective value range.  Vector and
+	   color options have to be specified by a list of space separated
+	   float values. Character escaping has to be done.  A special option
+	   name "default" is available to use default options for a filter.
+
+	   It is required to specify either "default" or at least one of the
+	   filter options.  All omitted options are used with their default
+	   values.  The syntax of the filter string is as follows:
+
+		   filter=<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...][#<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...]][#...]
+
+       output_rect
+	   Specify a rectangle where the output of the filter chain is copied
+	   into the input image. It is given by a list of space separated
+	   float values:
+
+		   output_rect=x\ y\ width\ height
+
+	   If not given, the output rectangle equals the dimensions of the
+	   input image.  The output rectangle is automatically cropped at the
+	   borders of the input image. Negative values are valid for each
+	   component.
+
+		   output_rect=25\ 25\ 100\ 100
+
+       Several filters can be chained for successive processing without GPU-
+       HOST transfers allowing for fast processing of complex filter chains.
+       Currently, only filters with zero (generators) or exactly one (filters)
+       input image and one output image are supported. Also, transition
+       filters are not yet usable as intended.
+
+       Some filters generate output images with additional padding depending
+       on the respective filter kernel. The padding is automatically removed
+       to ensure the filter output has the same size as the input image.
+
+       For image generators, the size of the output image is determined by the
+       previous output image of the filter chain or the input image of the
+       whole filterchain, respectively. The generators do not use the pixel
+       information of this image to generate their output. However, the
+       generated output is blended onto this image, resulting in partial or
+       complete coverage of the output image.
+
+       The coreimagesrc video source can be used for generating input images
+       which are directly fed into the filter chain. By using it, providing
+       input images by another video source or an input video is not required.
+
+       Examples
+
+       o   List all filters available:
+
+		   coreimage=list_filters=true
+
+       o   Use the CIBoxBlur filter with default options to blur an image:
+
+		   coreimage=filter=CIBoxBlur@default
+
+       o   Use a filter chain with CISepiaTone at default values and
+	   CIVignetteEffect with its center at 100x100 and a radius of 50
+	   pixels:
+
+		   coreimage=filter=CIBoxBlur@default#CIVignetteEffect@inputCenter=100\ 100@inputRadius=50
+
+       o   Use nullsrc and CIQRCodeGenerator to create a QR code for the
+	   FFmpeg homepage, given as complete and escaped command-line for
+	   Apple's standard bash shell:
+
+		   ffmpeg -f lavfi -i nullsrc=s=100x100,coreimage=filter=CIQRCodeGenerator@inputMessage=https\\\\\://FFmpeg.org/@inputCorrectionLevel=H -frames:v 1 QRCode.png
+
+   corr
+       Obtain the correlation between two input videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained per component, average, min and max correlation is printed
+       through the logging system.
+
+       The filter stores the calculated correlation of each frame in frame
+       metadata.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi corr -f null -
+
+   cover_rect
+       Cover a rectangular object
+
+       It accepts the following options:
+
+       cover
+	   Filepath of the optional cover image, needs to be in yuv420.
+
+       mode
+	   Set covering mode.
+
+	   It accepts the following values:
+
+	   cover
+	       cover it by the supplied image
+
+	   blur
+	       cover it by interpolating the surrounding pixels
+
+	   Default value is blur.
+
+       Examples
+
+       o   Cover a rectangular object by the supplied image of a given video
+	   using ffmpeg:
+
+		   ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv
+
+   crop
+       Crop the input video to given dimensions.
+
+       It accepts the following parameters:
+
+       w, out_w
+	   The width of the output video. It defaults to "iw".	This
+	   expression is evaluated only once during the filter configuration,
+	   or when the w or out_w command is sent.
+
+       h, out_h
+	   The height of the output video. It defaults to "ih".  This
+	   expression is evaluated only once during the filter configuration,
+	   or when the h or out_h command is sent.
+
+       x   The horizontal position, in the input video, of the left edge of
+	   the output video. It defaults to "(in_w-out_w)/2".  This expression
+	   is evaluated per-frame.
+
+       y   The vertical position, in the input video, of the top edge of the
+	   output video.  It defaults to "(in_h-out_h)/2".  This expression is
+	   evaluated per-frame.
+
+       keep_aspect
+	   If set to 1 will force the output display aspect ratio to be the
+	   same of the input, by changing the output sample aspect ratio. It
+	   defaults to 0.
+
+       exact
+	   Enable exact cropping. If enabled, subsampled videos will be
+	   cropped at exact width/height/x/y as specified and will not be
+	   rounded to nearest smaller value.  It defaults to 0.
+
+       The out_w, out_h, x, y parameters are expressions containing the
+       following constants:
+
+       x
+       y   The computed values for x and y. They are evaluated for each new
+	   frame.
+
+       in_w
+       in_h
+	   The input width and height.
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (cropped) width and height.
+
+       ow
+       oh  These are the same as out_w and out_h.
+
+       a   same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (iw / ih) * sar
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       n   The number of the input frame, starting from 0.
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       t   The timestamp expressed in seconds. It's NAN if the input timestamp
+	   is unknown.
+
+       The expression for out_w may depend on the value of out_h, and the
+       expression for out_h may depend on out_w, but they cannot depend on x
+       and y, as x and y are evaluated after out_w and out_h.
+
+       The x and y parameters specify the expressions for the position of the
+       top-left corner of the output (non-cropped) area. They are evaluated
+       for each frame. If the evaluated value is not valid, it is approximated
+       to the nearest valid value.
+
+       The expression for x may depend on y, and the expression for y may
+       depend on x.
+
+       Examples
+
+       o   Crop area with size 100x100 at position (12,34).
+
+		   crop=100:100:12:34
+
+	   Using named options, the example above becomes:
+
+		   crop=w=100:h=100:x=12:y=34
+
+       o   Crop the central input area with size 100x100:
+
+		   crop=100:100
+
+       o   Crop the central input area with size 2/3 of the input video:
+
+		   crop=2/3*in_w:2/3*in_h
+
+       o   Crop the input video central square:
+
+		   crop=out_w=in_h
+		   crop=in_h
+
+       o   Delimit the rectangle with the top-left corner placed at position
+	   100:100 and the right-bottom corner corresponding to the right-
+	   bottom corner of the input image.
+
+		   crop=in_w-100:in_h-100:100:100
+
+       o   Crop 10 pixels from the left and right borders, and 20 pixels from
+	   the top and bottom borders
+
+		   crop=in_w-2*10:in_h-2*20
+
+       o   Keep only the bottom right quarter of the input image:
+
+		   crop=in_w/2:in_h/2:in_w/2:in_h/2
+
+       o   Crop height for getting Greek harmony:
+
+		   crop=in_w:1/PHI*in_w
+
+       o   Apply trembling effect:
+
+		   crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)
+
+       o   Apply erratic camera effect depending on timestamp:
+
+		   crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(t*10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(t*13)
+
+       o   Set x depending on the value of y:
+
+		   crop=in_w/2:in_h/2:y:10+10*sin(n/10)
+
+       Commands
+
+       This filter supports the following commands:
+
+       w, out_w
+       h, out_h
+       x
+       y   Set width/height of the output video and the horizontal/vertical
+	   position in the input video.  The command accepts the same syntax
+	   of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   cropdetect
+       Auto-detect the crop size.
+
+       It calculates the necessary cropping parameters and prints the
+       recommended parameters via the logging system. The detected dimensions
+       correspond to the non-black or video area of the input video according
+       to mode.
+
+       It accepts the following parameters:
+
+       mode
+	   Depending on mode crop detection is based on either the mere black
+	   value of surrounding pixels or a combination of motion vectors and
+	   edge pixels.
+
+	   black
+	       Detect black pixels surrounding the playing video. For fine
+	       control use option limit.
+
+	   mvedges
+	       Detect the playing video by the motion vectors inside the video
+	       and scanning for edge pixels typically forming the border of a
+	       playing video.
+
+       limit
+	   Set higher black value threshold, which can be optionally specified
+	   from nothing (0) to everything (255 for 8-bit based formats). An
+	   intensity value greater to the set value is considered non-black.
+	   It defaults to 24.  You can also specify a value between 0.0 and
+	   1.0 which will be scaled depending on the bitdepth of the pixel
+	   format.
+
+       round
+	   The value which the width/height should be divisible by. It
+	   defaults to 16. The offset is automatically adjusted to center the
+	   video. Use 2 to get only even dimensions (needed for 4:2:2 video).
+	   16 is best when encoding to most video codecs.
+
+       skip
+	   Set the number of initial frames for which evaluation is skipped.
+	   Default is 2. Range is 0 to INT_MAX.
+
+       reset_count, reset
+	   Set the counter that determines after how many frames cropdetect
+	   will reset the previously detected largest video area and start
+	   over to detect the current optimal crop area. Default value is 0.
+
+	   This can be useful when channel logos distort the video area. 0
+	   indicates 'never reset', and returns the largest area encountered
+	   during playback.
+
+       mv_threshold
+	   Set motion in pixel units as threshold for motion detection. It
+	   defaults to 8.
+
+       low
+       high
+	   Set low and high threshold values used by the Canny thresholding
+	   algorithm.
+
+	   The high threshold selects the "strong" edge pixels, which are then
+	   connected through 8-connectivity with the "weak" edge pixels
+	   selected by the low threshold.
+
+	   low and high threshold values must be chosen in the range [0,1],
+	   and low should be lesser or equal to high.
+
+	   Default value for low is "5/255", and default value for high is
+	   "15/255".
+
+       Examples
+
+       o   Find video area surrounded by black borders:
+
+		   ffmpeg -i file.mp4 -vf cropdetect,metadata=mode=print -f null -
+
+       o   Find an embedded video area, generate motion vectors beforehand:
+
+		   ffmpeg -i file.mp4 -vf mestimate,cropdetect=mode=mvedges,metadata=mode=print -f null -
+
+       o   Find an embedded video area, use motion vectors from decoder:
+
+		   ffmpeg -flags2 +export_mvs -i file.mp4 -vf cropdetect=mode=mvedges,metadata=mode=print -f null -
+
+       Commands
+
+       This filter supports the following commands:
+
+       limit
+	   The command accepts the same syntax of the corresponding option.
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   cue
+       Delay video filtering until a given wallclock timestamp. The filter
+       first passes on preroll amount of frames, then it buffers at most
+       buffer amount of frames and waits for the cue. After reaching the cue
+       it forwards the buffered frames and also any subsequent frames coming
+       in its input.
+
+       The filter can be used synchronize the output of multiple ffmpeg
+       processes for realtime output devices like decklink. By putting the
+       delay in the filtering chain and pre-buffering frames the process can
+       pass on data to output almost immediately after the target wallclock
+       timestamp is reached.
+
+       Perfect frame accuracy cannot be guaranteed, but the result is good
+       enough for some use cases.
+
+       cue The cue timestamp expressed in a UNIX timestamp in microseconds.
+	   Default is 0.
+
+       preroll
+	   The duration of content to pass on as preroll expressed in seconds.
+	   Default is 0.
+
+       buffer
+	   The maximum duration of content to buffer before waiting for the
+	   cue expressed in seconds. Default is 0.
+
+   curves
+       Apply color adjustments using curves.
+
+       This filter is similar to the Adobe Photoshop and GIMP curves tools.
+       Each component (red, green and blue) has its values defined by N key
+       points tied from each other using a smooth curve. The x-axis represents
+       the pixel values from the input frame, and the y-axis the new pixel
+       values to be set for the output frame.
+
+       By default, a component curve is defined by the two points (0;0) and
+       (1;1). This creates a straight line where each original pixel value is
+       "adjusted" to its own value, which means no change to the image.
+
+       The filter allows you to redefine these two points and add some more. A
+       new curve will be define to pass smoothly through all these new
+       coordinates. The new defined points needs to be strictly increasing
+       over the x-axis, and their x and y values must be in the [0;1]
+       interval. The curve is formed by using a natural or monotonic cubic
+       spline interpolation, depending on the interp option (default:
+       "natural"). The "natural" spline produces a smoother curve in general
+       while the monotonic ("pchip") spline guarantees the transitions between
+       the specified points to be monotonic. If the computed curves happened
+       to go outside the vector spaces, the values will be clipped
+       accordingly.
+
+       The filter accepts the following options:
+
+       preset
+	   Select one of the available color presets. This option can be used
+	   in addition to the r, g, b parameters; in this case, the later
+	   options takes priority on the preset values.  Available presets
+	   are:
+
+	   none
+	   color_negative
+	   cross_process
+	   darker
+	   increase_contrast
+	   lighter
+	   linear_contrast
+	   medium_contrast
+	   negative
+	   strong_contrast
+	   vintage
+
+	   Default is "none".
+
+       master, m
+	   Set the master key points. These points will define a second pass
+	   mapping. It is sometimes called a "luminance" or "value" mapping.
+	   It can be used with r, g, b or all since it acts like a post-
+	   processing LUT.
+
+       red, r
+	   Set the key points for the red component.
+
+       green, g
+	   Set the key points for the green component.
+
+       blue, b
+	   Set the key points for the blue component.
+
+       all Set the key points for all components (not including master).  Can
+	   be used in addition to the other key points component options. In
+	   this case, the unset component(s) will fallback on this all
+	   setting.
+
+       psfile
+	   Specify a Photoshop curves file (".acv") to import the settings
+	   from.
+
+       plot
+	   Save Gnuplot script of the curves in specified file.
+
+       interp
+	   Specify the kind of interpolation. Available algorithms are:
+
+	   natural
+	       Natural cubic spline using a piece-wise cubic polynomial that
+	       is twice continuously differentiable.
+
+	   pchip
+	       Monotonic cubic spline using a piecewise cubic Hermite
+	       interpolating polynomial (PCHIP).
+
+       To avoid some filtergraph syntax conflicts, each key points list need
+       to be defined using the following syntax: "x0/y0 x1/y1 x2/y2 ...".
+
+       Commands
+
+       This filter supports same commands as options.
+
+       Examples
+
+       o   Increase slightly the middle level of blue:
+
+		   curves=blue='0/0 0.5/0.58 1/1'
+
+       o   Vintage effect:
+
+		   curves=r='0/0.11 .42/.51 1/0.95':g='0/0 0.50/0.48 1/1':b='0/0.22 .49/.44 1/0.8'
+
+	   Here we obtain the following coordinates for each components:
+
+	   red "(0;0.11) (0.42;0.51) (1;0.95)"
+
+	   green
+	       "(0;0) (0.50;0.48) (1;1)"
+
+	   blue
+	       "(0;0.22) (0.49;0.44) (1;0.80)"
+
+       o   The previous example can also be achieved with the associated
+	   built-in preset:
+
+		   curves=preset=vintage
+
+       o   Or simply:
+
+		   curves=vintage
+
+       o   Use a Photoshop preset and redefine the points of the green
+	   component:
+
+		   curves=psfile='MyCurvesPresets/purple.acv':green='0/0 0.45/0.53 1/1'
+
+       o   Check out the curves of the "cross_process" profile using ffmpeg
+	   and gnuplot:
+
+		   ffmpeg -f lavfi -i color -vf curves=cross_process:plot=/tmp/curves.plt -frames:v 1 -f null -
+		   gnuplot -p /tmp/curves.plt
+
+   datascope
+       Video data analysis filter.
+
+       This filter shows hexadecimal pixel values of part of video.
+
+       The filter accepts the following options:
+
+       size, s
+	   Set output video size.
+
+       x   Set x offset from where to pick pixels.
+
+       y   Set y offset from where to pick pixels.
+
+       mode
+	   Set scope mode, can be one of the following:
+
+	   mono
+	       Draw hexadecimal pixel values with white color on black
+	       background.
+
+	   color
+	       Draw hexadecimal pixel values with input video pixel color on
+	       black background.
+
+	   color2
+	       Draw hexadecimal pixel values on color background picked from
+	       input video, the text color is picked in such way so its always
+	       visible.
+
+       axis
+	   Draw rows and columns numbers on left and top of video.
+
+       opacity
+	   Set background opacity.
+
+       format
+	   Set display number format. Can be "hex", or "dec". Default is
+	   "hex".
+
+       components
+	   Set pixel components to display. By default all pixel components
+	   are displayed.
+
+       Commands
+
+       This filter supports same commands as options excluding "size" option.
+
+   dblur
+       Apply Directional blur filter.
+
+       The filter accepts the following options:
+
+       angle
+	   Set angle of directional blur. Default is 45.
+
+       radius
+	   Set radius of directional blur. Default is 5.
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   dctdnoiz
+       Denoise frames using 2D DCT (frequency domain filtering).
+
+       This filter is not designed for real time.
+
+       The filter accepts the following options:
+
+       sigma, s
+	   Set the noise sigma constant.
+
+	   This sigma defines a hard threshold of "3 * sigma"; every DCT
+	   coefficient (absolute value) below this threshold with be dropped.
+
+	   If you need a more advanced filtering, see expr.
+
+	   Default is 0.
+
+       overlap
+	   Set number overlapping pixels for each block. Since the filter can
+	   be slow, you may want to reduce this value, at the cost of a less
+	   effective filter and the risk of various artefacts.
+
+	   If the overlapping value doesn't permit processing the whole input
+	   width or height, a warning will be displayed and according borders
+	   won't be denoised.
+
+	   Default value is blocksize-1, which is the best possible setting.
+
+       expr, e
+	   Set the coefficient factor expression.
+
+	   For each coefficient of a DCT block, this expression will be
+	   evaluated as a multiplier value for the coefficient.
+
+	   If this is option is set, the sigma option will be ignored.
+
+	   The absolute value of the coefficient can be accessed through the c
+	   variable.
+
+       n   Set the blocksize using the number of bits. "1<<n" defines the
+	   blocksize, which is the width and height of the processed blocks.
+
+	   The default value is 3 (8x8) and can be raised to 4 for a blocksize
+	   of 16x16. Note that changing this setting has huge consequences on
+	   the speed processing. Also, a larger block size does not
+	   necessarily means a better de-noising.
+
+       Examples
+
+       Apply a denoise with a sigma of 4.5:
+
+	       dctdnoiz=4.5
+
+       The same operation can be achieved using the expression system:
+
+	       dctdnoiz=e='gte(c, 4.5*3)'
+
+       Violent denoise using a block size of "16x16":
+
+	       dctdnoiz=15:n=4
+
+   deband
+       Remove banding artifacts from input video.  It works by replacing
+       banded pixels with average value of referenced pixels.
+
+       The filter accepts the following options:
+
+       1thr
+       2thr
+       3thr
+       4thr
+	   Set banding detection threshold for each plane. Default is 0.02.
+	   Valid range is 0.00003 to 0.5.  If difference between current pixel
+	   and reference pixel is less than threshold, it will be considered
+	   as banded.
+
+       range, r
+	   Banding detection range in pixels. Default is 16. If positive,
+	   random number in range 0 to set value will be used. If negative,
+	   exact absolute value will be used.  The range defines square of
+	   four pixels around current pixel.
+
+       direction, d
+	   Set direction in radians from which four pixel will be compared. If
+	   positive, random direction from 0 to set direction will be picked.
+	   If negative, exact of absolute value will be picked. For example
+	   direction 0, -PI or -2*PI radians will pick only pixels on same row
+	   and -PI/2 will pick only pixels on same column.
+
+       blur, b
+	   If enabled, current pixel is compared with average value of all
+	   four surrounding pixels. The default is enabled. If disabled
+	   current pixel is compared with all four surrounding pixels. The
+	   pixel is considered banded if only all four differences with
+	   surrounding pixels are less than threshold.
+
+       coupling, c
+	   If enabled, current pixel is changed if and only if all pixel
+	   components are banded, e.g. banding detection threshold is
+	   triggered for all color components.	The default is disabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   deblock
+       Remove blocking artifacts from input video.
+
+       The filter accepts the following options:
+
+       filter
+	   Set filter type, can be weak or strong. Default is strong.  This
+	   controls what kind of deblocking is applied.
+
+       block
+	   Set size of block, allowed range is from 4 to 512. Default is 8.
+
+       alpha
+       beta
+       gamma
+       delta
+	   Set blocking detection thresholds. Allowed range is 0 to 1.
+	   Defaults are: 0.098 for alpha and 0.05 for the rest.  Using higher
+	   threshold gives more deblocking strength.  Setting alpha controls
+	   threshold detection at exact edge of block.	Remaining options
+	   controls threshold detection near the edge. Each one for
+	   below/above or left/right. Setting any of those to 0 disables
+	   deblocking.
+
+       planes
+	   Set planes to filter. Default is to filter all available planes.
+
+       Examples
+
+       o   Deblock using weak filter and block size of 4 pixels.
+
+		   deblock=filter=weak:block=4
+
+       o   Deblock using strong filter, block size of 4 pixels and custom
+	   thresholds for deblocking more edges.
+
+		   deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05
+
+       o   Similar as above, but filter only first plane.
+
+		   deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=1
+
+       o   Similar as above, but filter only second and third plane.
+
+		   deblock=filter=strong:block=4:alpha=0.12:beta=0.07:gamma=0.06:delta=0.05:planes=6
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   decimate
+       Drop duplicated frames at regular intervals.
+
+       The filter accepts the following options:
+
+       cycle
+	   Set the number of frames from which one will be dropped. Setting
+	   this to N means one frame in every batch of N frames will be
+	   dropped.  Default is 5.
+
+       dupthresh
+	   Set the threshold for duplicate detection. If the difference metric
+	   for a frame is less than or equal to this value, then it is
+	   declared as duplicate. Default is 1.1
+
+       scthresh
+	   Set scene change threshold. Default is 15.
+
+       blockx
+       blocky
+	   Set the size of the x and y-axis blocks used during metric
+	   calculations.  Larger blocks give better noise suppression, but
+	   also give worse detection of small movements. Must be a power of
+	   two. Default is 32.
+
+       ppsrc
+	   Mark main input as a pre-processed input and activate clean source
+	   input stream. This allows the input to be pre-processed with
+	   various filters to help the metrics calculation while keeping the
+	   frame selection lossless. When set to 1, the first stream is for
+	   the pre-processed input, and the second stream is the clean source
+	   from where the kept frames are chosen. Default is 0.
+
+       chroma
+	   Set whether or not chroma is considered in the metric calculations.
+	   Default is 1.
+
+       mixed
+	   Set whether or not the input only partially contains content to be
+	   decimated.  Default is "false".  If enabled video output stream
+	   will be in variable frame rate.
+
+   deconvolve
+       Apply 2D deconvolution of video stream in frequency domain using second
+       stream as impulse.
+
+       The filter accepts the following options:
+
+       planes
+	   Set which planes to process.
+
+       impulse
+	   Set which impulse video frames will be processed, can be first or
+	   all. Default is all.
+
+       noise
+	   Set noise when doing divisions. Default is 0.0000001. Useful when
+	   width and height are not same and not power of 2 or if stream prior
+	   to convolving had noise.
+
+       The "deconvolve" filter also supports the framesync options.
+
+   dedot
+       Reduce cross-luminance (dot-crawl) and cross-color (rainbows) from
+       video.
+
+       It accepts the following options:
+
+       m   Set mode of operation. Can be combination of dotcrawl for cross-
+	   luminance reduction and/or rainbows for cross-color reduction.
+
+       lt  Set spatial luma threshold. Lower values increases reduction of
+	   cross-luminance.
+
+       tl  Set tolerance for temporal luma. Higher values increases reduction
+	   of cross-luminance.
+
+       tc  Set tolerance for chroma temporal variation. Higher values
+	   increases reduction of cross-color.
+
+       ct  Set temporal chroma threshold. Lower values increases reduction of
+	   cross-color.
+
+   deflate
+       Apply deflate effect to the video.
+
+       This filter replaces the pixel by the local(3x3) average by taking into
+       account only values lower than the pixel.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   deflicker
+       Remove temporal frame luminance variations.
+
+       It accepts the following options:
+
+       size, s
+	   Set moving-average filter size in frames. Default is 5. Allowed
+	   range is 2 - 129.
+
+       mode, m
+	   Set averaging mode to smooth temporal luminance variations.
+
+	   Available values are:
+
+	   am  Arithmetic mean
+
+	   gm  Geometric mean
+
+	   hm  Harmonic mean
+
+	   qm  Quadratic mean
+
+	   cm  Cubic mean
+
+	   pm  Power mean
+
+	   median
+	       Median
+
+       bypass
+	   Do not actually modify frame. Useful when one only wants metadata.
+
+   dejudder
+       Remove judder produced by partially interlaced telecined content.
+
+       Judder can be introduced, for instance, by pullup filter. If the
+       original source was partially telecined content then the output of
+       "pullup,dejudder" will have a variable frame rate. May change the
+       recorded frame rate of the container. Aside from that change, this
+       filter will not affect constant frame rate video.
+
+       The option available in this filter is:
+
+       cycle
+	   Specify the length of the window over which the judder repeats.
+
+	   Accepts any integer greater than 1. Useful values are:
+
+	   4   If the original was telecined from 24 to 30 fps (Film to NTSC).
+
+	   5   If the original was telecined from 25 to 30 fps (PAL to NTSC).
+
+	   20  If a mixture of the two.
+
+	   The default is 4.
+
+   delogo
+       Suppress a TV station logo by a simple interpolation of the surrounding
+       pixels. Just set a rectangle covering the logo and watch it disappear
+       (and sometimes something even uglier appear - your mileage may vary).
+
+       It accepts the following parameters:
+
+       x
+       y   Specify the top left corner coordinates of the logo. They must be
+	   specified.
+
+       w
+       h   Specify the width and height of the logo to clear. They must be
+	   specified.
+
+       show
+	   When set to 1, a green rectangle is drawn on the screen to simplify
+	   finding the right x, y, w, and h parameters.  The default value is
+	   0.
+
+	   The rectangle is drawn on the outermost pixels which will be
+	   (partly) replaced with interpolated values. The values of the next
+	   pixels immediately outside this rectangle in each direction will be
+	   used to compute the interpolated pixel values inside the rectangle.
+
+       Examples
+
+       o   Set a rectangle covering the area with top left corner coordinates
+	   0,0 and size 100x77:
+
+		   delogo=x=0:y=0:w=100:h=77
+
+   derain
+       Remove the rain in the input image/video by applying the derain methods
+       based on convolutional neural networks. Supported models:
+
+       o   Recurrent Squeeze-and-Excitation Context Aggregation Net (RESCAN).
+	   See
+	   <http://openaccess.thecvf.com/content_ECCV_2018/papers/Xia_Li_Recurrent_Squeeze-and-Excitation_Context_ECCV_2018_paper.pdf>.
+
+       Training as well as model generation scripts are provided in the
+       repository at <https://github.com/XueweiMeng/derain_filter.git>.
+
+       The filter accepts the following options:
+
+       filter_type
+	   Specify which filter to use. This option accepts the following
+	   values:
+
+	   derain
+	       Derain filter. To conduct derain filter, you need to use a
+	       derain model.
+
+	   dehaze
+	       Dehaze filter. To conduct dehaze filter, you need to use a
+	       dehaze model.
+
+	   Default value is derain.
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts the following values:
+
+	   tensorflow
+	       TensorFlow backend. To enable this backend you need to install
+	       the TensorFlow for C library (see
+	       <https://www.tensorflow.org/install/lang_c>) and configure
+	       FFmpeg with "--enable-libtensorflow"
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats. TensorFlow can load files for only its format.
+
+       To get full functionality (such as async execution), please use the
+       dnn_processing filter.
+
+   deshake
+       Attempt to fix small changes in horizontal and/or vertical shift. This
+       filter helps remove camera shake from hand-holding a camera, bumping a
+       tripod, moving on a vehicle, etc.
+
+       The filter accepts the following options:
+
+       x
+       y
+       w
+       h   Specify a rectangular area where to limit the search for motion
+	   vectors.  If desired the search for motion vectors can be limited
+	   to a rectangular area of the frame defined by its top left corner,
+	   width and height. These parameters have the same meaning as the
+	   drawbox filter which can be used to visualise the position of the
+	   bounding box.
+
+	   This is useful when simultaneous movement of subjects within the
+	   frame might be confused for camera motion by the motion vector
+	   search.
+
+	   If any or all of x, y, w and h are set to -1 then the full frame is
+	   used. This allows later options to be set without specifying the
+	   bounding box for the motion vector search.
+
+	   Default - search the whole frame.
+
+       rx
+       ry  Specify the maximum extent of movement in x and y directions in the
+	   range 0-64 pixels. Default 16.
+
+       edge
+	   Specify how to generate pixels to fill blanks at the edge of the
+	   frame. Available values are:
+
+	   blank, 0
+	       Fill zeroes at blank locations
+
+	   original, 1
+	       Original image at blank locations
+
+	   clamp, 2
+	       Extruded edge value at blank locations
+
+	   mirror, 3
+	       Mirrored edge at blank locations
+
+	   Default value is mirror.
+
+       blocksize
+	   Specify the blocksize to use for motion search. Range 4-128 pixels,
+	   default 8.
+
+       contrast
+	   Specify the contrast threshold for blocks. Only blocks with more
+	   than the specified contrast (difference between darkest and
+	   lightest pixels) will be considered. Range 1-255, default 125.
+
+       search
+	   Specify the search strategy. Available values are:
+
+	   exhaustive, 0
+	       Set exhaustive search
+
+	   less, 1
+	       Set less exhaustive search.
+
+	   Default value is exhaustive.
+
+       filename
+	   If set then a detailed log of the motion search is written to the
+	   specified file.
+
+   despill
+       Remove unwanted contamination of foreground colors, caused by reflected
+       color of greenscreen or bluescreen.
+
+       This filter accepts the following options:
+
+       type
+	   Set what type of despill to use.
+
+       mix Set how spillmap will be generated.
+
+       expand
+	   Set how much to get rid of still remaining spill.
+
+       red Controls amount of red in spill area.
+
+       green
+	   Controls amount of green in spill area.  Should be -1 for
+	   greenscreen.
+
+       blue
+	   Controls amount of blue in spill area.  Should be -1 for
+	   bluescreen.
+
+       brightness
+	   Controls brightness of spill area, preserving colors.
+
+       alpha
+	   Modify alpha from generated spillmap.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   detelecine
+       Apply an exact inverse of the telecine operation. It requires a
+       predefined pattern specified using the pattern option which must be the
+       same as that passed to the telecine filter.
+
+       This filter accepts the following options:
+
+       first_field
+	   top, t
+	       top field first
+
+	   bottom, b
+	       bottom field first The default value is "top".
+
+       pattern
+	   A string of numbers representing the pulldown pattern you wish to
+	   apply.  The default value is 23.
+
+       start_frame
+	   A number representing position of the first frame with respect to
+	   the telecine pattern. This is to be used if the stream is cut. The
+	   default value is 0.
+
+   dilation
+       Apply dilation effect to the video.
+
+       This filter replaces the pixel by the local(3x3) maximum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to. Default is 255 i.e. all
+	   eight pixels are used.
+
+	   Flags to local 3x3 coordinates maps like this:
+
+	       1 2 3
+	       4   5
+	       6 7 8
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   displace
+       Displace pixels as indicated by second and third input stream.
+
+       It takes three input streams and outputs one stream, the first input is
+       the source, and second and third input are displacement maps.
+
+       The second input specifies how much to displace pixels along the
+       x-axis, while the third input specifies how much to displace pixels
+       along the y-axis.  If one of displacement map streams terminates, last
+       frame from that displacement map will be used.
+
+       Note that once generated, displacements maps can be reused over and
+       over again.
+
+       A description of the accepted options follows.
+
+       edge
+	   Set displace behavior for pixels that are out of range.
+
+	   Available values are:
+
+	   blank
+	       Missing pixels are replaced by black pixels.
+
+	   smear
+	       Adjacent pixels will spread out to replace missing pixels.
+
+	   wrap
+	       Out of range pixels are wrapped so they point to pixels of
+	       other side.
+
+	   mirror
+	       Out of range pixels will be replaced with mirrored pixels.
+
+	   Default is smear.
+
+       Examples
+
+       o   Add ripple effect to rgb input of video size hd720:
+
+		   ffmpeg -i INPUT -f lavfi -i nullsrc=s=hd720,lutrgb=128:128:128 -f lavfi -i nullsrc=s=hd720,geq='r=128+30*sin(2*PI*X/400+T):g=128+30*sin(2*PI*X/400+T):b=128+30*sin(2*PI*X/400+T)' -lavfi '[0][1][2]displace' OUTPUT
+
+       o   Add wave effect to rgb input of video size hd720:
+
+		   ffmpeg -i INPUT -f lavfi -i nullsrc=hd720,geq='r=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T)):g=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T)):b=128+80*(sin(sqrt((X-W/2)*(X-W/2)+(Y-H/2)*(Y-H/2))/220*2*PI+T))' -lavfi '[1]split[x][y],[0][x][y]displace' OUTPUT
+
+   dnn_classify
+       Do classification with deep neural networks based on bounding boxes.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts only openvino now, tensorflow backends will be
+	   added.
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats.
+
+       input
+	   Set the input name of the dnn network.
+
+       output
+	   Set the output name of the dnn network.
+
+       confidence
+	   Set the confidence threshold (default: 0.5).
+
+       labels
+	   Set path to label file specifying the mapping between label id and
+	   name.  Each label name is written in one line, tailing spaces and
+	   empty lines are skipped.  The first line is the name of label id 0,
+	   and the second line is the name of label id 1, etc.	The label id
+	   is considered as name if the label file is not provided.
+
+       backend_configs
+	   Set the configs to be passed into backend
+
+	   For tensorflow backend, you can set its configs with sess_config
+	   options, please use tools/python/tf_sess_config.py to get the
+	   configs for your system.
+
+   dnn_detect
+       Do object detection with deep neural networks.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts only openvino now, tensorflow backends will be
+	   added.
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats.
+
+       input
+	   Set the input name of the dnn network.
+
+       output
+	   Set the output name of the dnn network.
+
+       confidence
+	   Set the confidence threshold (default: 0.5).
+
+       labels
+	   Set path to label file specifying the mapping between label id and
+	   name.  Each label name is written in one line, tailing spaces and
+	   empty lines are skipped.  The first line is the name of label id 0
+	   (usually it is 'background'), and the second line is the name of
+	   label id 1, etc.  The label id is considered as name if the label
+	   file is not provided.
+
+       backend_configs
+	   Set the configs to be passed into backend. To use async execution,
+	   set async (default: set).  Roll back to sync execution if the
+	   backend does not support async.
+
+   dnn_processing
+       Do image processing with deep neural networks. It works together with
+       another filter which converts the pixel format of the Frame to what the
+       dnn network requires.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts the following values:
+
+	   tensorflow
+	       TensorFlow backend. To enable this backend you need to install
+	       the TensorFlow for C library (see
+	       <https://www.tensorflow.org/install/lang_c>) and configure
+	       FFmpeg with "--enable-libtensorflow"
+
+	   openvino
+	       OpenVINO backend. To enable this backend you need to build and
+	       install the OpenVINO for C library (see
+	       <https://github.com/openvinotoolkit/openvino/blob/master/build-instruction.md>)
+	       and configure FFmpeg with "--enable-libopenvino"
+	       (--extra-cflags=-I... --extra-ldflags=-L... might be needed if
+	       the header files and libraries are not installed into system
+	       path)
+
+	   torch
+	       Libtorch backend. To enable this backend you need to build and
+	       install Libtroch for C++ library. Please download cxx11 ABI
+	       version (see <https://pytorch.org/get-started/locally>) and
+	       configure FFmpeg with "--enable-libtorch
+	       --extra-cflags=-I/libtorch_root/libtorch/include
+	       --extra-cflags=-I/libtorch_root/libtorch/include/torch/csrc/api/include
+	       --extra-ldflags=-L/libtorch_root/libtorch/lib/"
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats. TensorFlow, OpenVINO and Libtorch backend can load files
+	   for only its format.
+
+       input
+	   Set the input name of the dnn network.
+
+       output
+	   Set the output name of the dnn network.
+
+       backend_configs
+	   Set the configs to be passed into backend. To use async execution,
+	   set async (default: set).  Roll back to sync execution if the
+	   backend does not support async.
+
+	   For tensorflow backend, you can set its configs with sess_config
+	   options, please use tools/python/tf_sess_config.py to get the
+	   configs of TensorFlow backend for your system.
+
+       Examples
+
+       o   Remove rain in rgb24 frame with can.pb (see derain filter):
+
+		   ./ffmpeg -i rain.jpg -vf format=rgb24,dnn_processing=dnn_backend=tensorflow:model=can.pb:input=x:output=y derain.jpg
+
+       o   Handle the Y channel with srcnn.pb (see sr filter) for frame with
+	   yuv420p (planar YUV formats supported):
+
+		   ./ffmpeg -i 480p.jpg -vf format=yuv420p,scale=w=iw*2:h=ih*2,dnn_processing=dnn_backend=tensorflow:model=srcnn.pb:input=x:output=y -y srcnn.jpg
+
+       o   Handle the Y channel with espcn.pb (see sr filter), which changes
+	   frame size, for format yuv420p (planar YUV formats supported),
+	   please use tools/python/tf_sess_config.py to get the configs of
+	   TensorFlow backend for your system.
+
+		   ./ffmpeg -i 480p.jpg -vf format=yuv420p,dnn_processing=dnn_backend=tensorflow:model=espcn.pb:input=x:output=y:backend_configs=sess_config=0x10022805320e09cdccccccccccec3f20012a01303801 -y tmp.espcn.jpg
+
+   drawbox
+       Draw a colored box on the input image.
+
+       It accepts the following parameters:
+
+       x
+       y   The expressions which specify the top left corner coordinates of
+	   the box. It defaults to 0.
+
+       width, w
+       height, h
+	   The expressions which specify the width and height of the box; if 0
+	   they are interpreted as the input width and height. It defaults to
+	   0.
+
+       color, c
+	   Specify the color of the box to write. For the general syntax of
+	   this option, check the "Color" section in the ffmpeg-utils manual.
+	   If the special value "invert" is used, the box edge color is the
+	   same as the video with inverted luma.
+
+       thickness, t
+	   The expression which sets the thickness of the box edge.  A value
+	   of "fill" will create a filled box. Default value is 3.
+
+	   See below for the list of accepted constants.
+
+       replace
+	   Applicable if the input has alpha. With value 1, the pixels of the
+	   painted box will overwrite the video's color and alpha pixels.
+	   Default is 0, which composites the box onto the input, leaving the
+	   video's alpha intact.
+
+       The parameters for x, y, w and h and t are expressions containing the
+       following constants:
+
+       dar The input display aspect ratio, it is the same as (w / h) * sar.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       in_h, ih
+       in_w, iw
+	   The input width and height.
+
+       sar The input sample aspect ratio.
+
+       x
+       y   The x and y offset coordinates where the box is drawn.
+
+       w
+       h   The width and height of the drawn box.
+
+       box_source
+	   Box source can be set as side_data_detection_bboxes if you want to
+	   use box data in detection bboxes of side data.
+
+	   If box_source is set, the x, y, width and height will be ignored
+	   and still use box data in detection bboxes of side data. So please
+	   do not use this parameter if you were not sure about the box
+	   source.
+
+       t   The thickness of the drawn box.
+
+	   These constants allow the x, y, w, h and t expressions to refer to
+	   each other, so you may for example specify "y=x/dar" or "h=w/dar".
+
+       Examples
+
+       o   Draw a black box around the edge of the input image:
+
+		   drawbox
+
+       o   Draw a box with color red and an opacity of 50%:
+
+		   drawbox=10:20:200:60:red@0.5
+
+	   The previous example can be specified as:
+
+		   drawbox=x=10:y=20:w=200:h=60:color=red@0.5
+
+       o   Fill the box with pink color:
+
+		   drawbox=x=10:y=10:w=100:h=100:color=pink@0.5:t=fill
+
+       o   Draw a 2-pixel red 2.40:1 mask:
+
+		   drawbox=x=-t:y=0.5*(ih-iw/2.4)-t:w=iw+t*2:h=iw/2.4+t*2:t=2:c=red
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   drawgraph
+       Draw a graph using input video metadata.
+
+       It accepts the following parameters:
+
+       m1  Set 1st frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg1 Set 1st foreground color expression.
+
+       m2  Set 2nd frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg2 Set 2nd foreground color expression.
+
+       m3  Set 3rd frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg3 Set 3rd foreground color expression.
+
+       m4  Set 4th frame metadata key from which metadata values will be used
+	   to draw a graph.
+
+       fg4 Set 4th foreground color expression.
+
+       min Set minimal value of metadata value.
+
+       max Set maximal value of metadata value.
+
+       bg  Set graph background color. Default is white.
+
+       mode
+	   Set graph mode.
+
+	   Available values for mode is:
+
+	   bar
+	   dot
+	   line
+
+	   Default is "line".
+
+       slide
+	   Set slide mode.
+
+	   Available values for slide is:
+
+	   frame
+	       Draw new frame when right border is reached.
+
+	   replace
+	       Replace old columns with new ones.
+
+	   scroll
+	       Scroll from right to left.
+
+	   rscroll
+	       Scroll from left to right.
+
+	   picture
+	       Draw single picture.
+
+	   Default is "frame".
+
+       size
+	   Set size of graph video. For the syntax of this option, check the
+	   "Video size" section in the ffmpeg-utils manual.  The default value
+	   is "900x256".
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+	   The foreground color expressions can use the following variables:
+
+	   MIN Minimal value of metadata value.
+
+	   MAX Maximal value of metadata value.
+
+	   VAL Current metadata key value.
+
+	   The color is defined as 0xAABBGGRR.
+
+       Example using metadata from signalstats filter:
+
+	       signalstats,drawgraph=lavfi.signalstats.YAVG:min=0:max=255
+
+       Example using metadata from ebur128 filter:
+
+	       ebur128=metadata=1,adrawgraph=lavfi.r128.M:min=-120:max=5
+
+   drawgrid
+       Draw a grid on the input image.
+
+       It accepts the following parameters:
+
+       x
+       y   The expressions which specify the coordinates of some point of grid
+	   intersection (meant to configure offset). Both default to 0.
+
+       width, w
+       height, h
+	   The expressions which specify the width and height of the grid
+	   cell, if 0 they are interpreted as the input width and height,
+	   respectively, minus "thickness", so image gets framed. Default to
+	   0.
+
+       color, c
+	   Specify the color of the grid. For the general syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual. If
+	   the special value "invert" is used, the grid color is the same as
+	   the video with inverted luma.
+
+       thickness, t
+	   The expression which sets the thickness of the grid line. Default
+	   value is 1.
+
+	   See below for the list of accepted constants.
+
+       replace
+	   Applicable if the input has alpha. With 1 the pixels of the painted
+	   grid will overwrite the video's color and alpha pixels.  Default is
+	   0, which composites the grid onto the input, leaving the video's
+	   alpha intact.
+
+       The parameters for x, y, w and h and t are expressions containing the
+       following constants:
+
+       dar The input display aspect ratio, it is the same as (w / h) * sar.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       in_h, ih
+       in_w, iw
+	   The input grid cell width and height.
+
+       sar The input sample aspect ratio.
+
+       x
+       y   The x and y coordinates of some point of grid intersection (meant
+	   to configure offset).
+
+       w
+       h   The width and height of the drawn cell.
+
+       t   The thickness of the drawn cell.
+
+	   These constants allow the x, y, w, h and t expressions to refer to
+	   each other, so you may for example specify "y=x/dar" or "h=w/dar".
+
+       Examples
+
+       o   Draw a grid with cell 100x100 pixels, thickness 2 pixels, with
+	   color red and an opacity of 50%:
+
+		   drawgrid=width=100:height=100:thickness=2:color=red@0.5
+
+       o   Draw a white 3x3 grid with an opacity of 50%:
+
+		   drawgrid=w=iw/3:h=ih/3:t=2:c=white@0.5
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   drawtext
+       Draw a text string or text from a specified file on top of a video,
+       using the libfreetype library.
+
+       To enable compilation of this filter, you need to configure FFmpeg with
+       "--enable-libfreetype" and "--enable-libharfbuzz".  To enable default
+       font fallback and the font option you need to configure FFmpeg with
+       "--enable-libfontconfig".  To enable the text_shaping option, you need
+       to configure FFmpeg with "--enable-libfribidi".
+
+       Syntax
+
+       It accepts the following parameters:
+
+       box Used to draw a box around text using the background color.  The
+	   value must be either 1 (enable) or 0 (disable).  The default value
+	   of box is 0.
+
+       boxborderw
+	   Set the width of the border to be drawn around the box using
+	   boxcolor.  The value must be specified using one of the following
+	   formats:
+
+	   *<"boxborderw=10" set the width of all the borders to 10>
+	   *<"boxborderw=10|20" set the width of the top and bottom borders to
+	   10>
+		   and the width of the left and right borders to 20
+
+	   *<"boxborderw=10|20|30" set the width of the top border to 10, the
+	   width>
+		   of the bottom border to 30 and the width of the left and right borders to 20
+
+	   *<"boxborderw=10|20|30|40" set the borders width to 10 (top), 20
+	   (right),>
+		   30 (bottom), 40 (left)
+
+	   The default value of boxborderw is "0".
+
+       boxcolor
+	   The color to be used for drawing box around text. For the syntax of
+	   this option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of boxcolor is "white".
+
+       line_spacing
+	   Set the line spacing in pixels. The default value of line_spacing
+	   is 0.
+
+       text_align
+	   Set the vertical and horizontal alignment of the text with respect
+	   to the box boundaries.  The value is combination of flags, one for
+	   the vertical alignment (T=top, M=middle, B=bottom) and one for the
+	   horizontal alignment (L=left, C=center, R=right).  Please note that
+	   tab characters are only supported with the left horizontal
+	   alignment.
+
+       y_align
+	   Specify what the y value is referred to. Possible values are:
+
+	   *<"text" the top of the highest glyph of the first text line is
+	   placed at y>
+	   *<"baseline" the baseline of the first text line is placed at y>
+	   *<"font" the baseline of the first text line is placed at y plus
+	   the>
+		   ascent (in pixels) defined in the font metrics
+
+	   The default value of y_align is "text" for backward compatibility.
+
+       borderw
+	   Set the width of the border to be drawn around the text using
+	   bordercolor.  The default value of borderw is 0.
+
+       bordercolor
+	   Set the color to be used for drawing border around text. For the
+	   syntax of this option, check the "Color" section in the ffmpeg-
+	   utils manual.
+
+	   The default value of bordercolor is "black".
+
+       expansion
+	   Select how the text is expanded. Can be either "none", "strftime"
+	   (deprecated) or "normal" (default). See the drawtext_expansion,
+	   Text expansion section below for details.
+
+       basetime
+	   Set a start time for the count. Value is in microseconds. Only
+	   applied in the deprecated "strftime" expansion mode. To emulate in
+	   normal expansion mode use the "pts" function, supplying the start
+	   time (in seconds) as the second argument.
+
+       fix_bounds
+	   If true, check and fix text coords to avoid clipping.
+
+       fontcolor
+	   The color to be used for drawing fonts. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of fontcolor is "black".
+
+       fontcolor_expr
+	   String which is expanded the same way as text to obtain dynamic
+	   fontcolor value. By default this option has empty value and is not
+	   processed. When this option is set, it overrides fontcolor option.
+
+       font
+	   The font family to be used for drawing text. By default Sans.
+
+       fontfile
+	   The font file to be used for drawing text. The path must be
+	   included.  This parameter is mandatory if the fontconfig support is
+	   disabled.
+
+       alpha
+	   Draw the text applying alpha blending. The value can be a number
+	   between 0.0 and 1.0.  The expression accepts the same variables x,
+	   y as well.  The default value is 1.	Please see fontcolor_expr.
+
+       fontsize
+	   The font size to be used for drawing text.  The default value of
+	   fontsize is 16.
+
+       text_shaping
+	   If set to 1, attempt to shape the text (for example, reverse the
+	   order of right-to-left text and join Arabic characters) before
+	   drawing it.	Otherwise, just draw the text exactly as given.  By
+	   default 1 (if supported).
+
+       ft_load_flags
+	   The flags to be used for loading the fonts.
+
+	   The flags map the corresponding flags supported by libfreetype, and
+	   are a combination of the following values:
+
+	   default
+	   no_scale
+	   no_hinting
+	   render
+	   no_bitmap
+	   vertical_layout
+	   force_autohint
+	   crop_bitmap
+	   pedantic
+	   ignore_global_advance_width
+	   no_recurse
+	   ignore_transform
+	   monochrome
+	   linear_design
+	   no_autohint
+
+	   Default value is "default".
+
+	   For more information consult the documentation for the FT_LOAD_*
+	   libfreetype flags.
+
+       shadowcolor
+	   The color to be used for drawing a shadow behind the drawn text.
+	   For the syntax of this option, check the "Color" section in the
+	   ffmpeg-utils manual.
+
+	   The default value of shadowcolor is "black".
+
+       boxw
+	   Set the width of the box to be drawn around text.  The default
+	   value of boxw is computed automatically to match the text width
+
+       boxh
+	   Set the height of the box to be drawn around text.  The default
+	   value of boxh is computed automatically to match the text height
+
+       shadowx
+       shadowy
+	   The x and y offsets for the text shadow position with respect to
+	   the position of the text. They can be either positive or negative
+	   values. The default value for both is "0".
+
+       start_number
+	   The starting frame number for the n/frame_num variable. The default
+	   value is "0".
+
+       tabsize
+	   The size in number of spaces to use for rendering the tab.  Default
+	   value is 4.
+
+       timecode
+	   Set the initial timecode representation in "hh:mm:ss[:;.]ff"
+	   format. It can be used with or without text parameter.
+	   timecode_rate option must be specified.
+
+       timecode_rate, rate, r
+	   Set the timecode frame rate (timecode only). Value will be rounded
+	   to nearest integer. Minimum value is "1".  Drop-frame timecode is
+	   supported for frame rates 30 & 60.
+
+       tc24hmax
+	   If set to 1, the output of the timecode option will wrap around at
+	   24 hours.  Default is 0 (disabled).
+
+       text
+	   The text string to be drawn. The text must be a sequence of UTF-8
+	   encoded characters.	This parameter is mandatory if no file is
+	   specified with the parameter textfile.
+
+       textfile
+	   A text file containing text to be drawn. The text must be a
+	   sequence of UTF-8 encoded characters.
+
+	   This parameter is mandatory if no text string is specified with the
+	   parameter text.
+
+	   If both text and textfile are specified, an error is thrown.
+
+       text_source
+	   Text source should be set as side_data_detection_bboxes if you want
+	   to use text data in detection bboxes of side data.
+
+	   If text source is set, text and textfile will be ignored and still
+	   use text data in detection bboxes of side data. So please do not
+	   use this parameter if you are not sure about the text source.
+
+       reload
+	   The textfile will be reloaded at specified frame interval.  Be sure
+	   to update textfile atomically, or it may be read partially, or even
+	   fail.  Range is 0 to INT_MAX. Default is 0.
+
+       x
+       y   The expressions which specify the offsets where text will be drawn
+	   within the video frame. They are relative to the top/left border of
+	   the output image.
+
+	   The default value of x and y is "0".
+
+	   See below for the list of accepted constants and functions.
+
+       The parameters for x and y are expressions containing the following
+       constants and functions:
+
+       dar input display aspect ratio, it is the same as (w / h) * sar
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       line_h, lh
+	   the height of each text line
+
+       main_h, h, H
+	   the input height
+
+       main_w, w, W
+	   the input width
+
+       max_glyph_a, ascent
+	   the maximum distance from the baseline to the highest/upper grid
+	   coordinate used to place a glyph outline point, for all the
+	   rendered glyphs.  It is a positive value, due to the grid's
+	   orientation with the Y axis upwards.
+
+       max_glyph_d, descent
+	   the maximum distance from the baseline to the lowest grid
+	   coordinate used to place a glyph outline point, for all the
+	   rendered glyphs.  This is a negative value, due to the grid's
+	   orientation, with the Y axis upwards.
+
+       max_glyph_h
+	   maximum glyph height, that is the maximum height for all the glyphs
+	   contained in the rendered text, it is equivalent to ascent -
+	   descent.
+
+       max_glyph_w
+	   maximum glyph width, that is the maximum width for all the glyphs
+	   contained in the rendered text
+
+       font_a
+	   the ascent size defined in the font metrics
+
+       font_d
+	   the descent size defined in the font metrics
+
+       top_a
+	   the maximum ascender of the glyphs of the first text line
+
+       bottom_d
+	   the maximum descender of the glyphs of the last text line
+
+       n   the number of input frame, starting from 0
+
+       rand(min, max)
+	   return a random number included between min and max
+
+       sar The input sample aspect ratio.
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       text_h, th
+	   the height of the rendered text
+
+       text_w, tw
+	   the width of the rendered text
+
+       x
+       y   the x and y offset coordinates where the text is drawn.
+
+	   These parameters allow the x and y expressions to refer to each
+	   other, so you can for example specify "y=x/dar".
+
+       pict_type
+	   A one character description of the current frame's picture type.
+
+       pkt_pos
+	   The current packet's position in the input file or stream (in
+	   bytes, from the start of the input). A value of -1 indicates this
+	   info is not available.
+
+       duration
+	   The current packet's duration, in seconds.
+
+       pkt_size
+	   The current packet's size (in bytes).
+
+       Text expansion
+
+       If expansion is set to "strftime", the filter recognizes sequences
+       accepted by the "strftime" C function in the provided text and expands
+       them accordingly. Check the documentation of "strftime". This feature
+       is deprecated in favor of "normal" expansion with the "gmtime" or
+       "localtime" expansion functions.
+
+       If expansion is set to "none", the text is printed verbatim.
+
+       If expansion is set to "normal" (which is the default), the following
+       expansion mechanism is used.
+
+       The backslash character \, followed by any character, always expands to
+       the second character.
+
+       Sequences of the form "%{...}" are expanded. The text between the
+       braces is a function name, possibly followed by arguments separated by
+       ':'.  If the arguments contain special characters or delimiters (':' or
+       '}'), they should be escaped.
+
+       Note that they probably must also be escaped as the value for the text
+       option in the filter argument string and as the filter argument in the
+       filtergraph description, and possibly also for the shell, that makes up
+       to four levels of escaping; using a text file with the textfile option
+       avoids these problems.
+
+       The following functions are available:
+
+       expr, e
+	   The expression evaluation result.
+
+	   It must take one argument specifying the expression to be
+	   evaluated, which accepts the same constants and functions as the x
+	   and y values. Note that not all constants should be used, for
+	   example the text size is not known when evaluating the expression,
+	   so the constants text_w and text_h will have an undefined value.
+
+       expr_int_format, eif
+	   Evaluate the expression's value and output as formatted integer.
+
+	   The first argument is the expression to be evaluated, just as for
+	   the expr function.  The second argument specifies the output
+	   format. Allowed values are x, X, d and u. They are treated exactly
+	   as in the "printf" function.  The third parameter is optional and
+	   sets the number of positions taken by the output.  It can be used
+	   to add padding with zeros from the left.
+
+       gmtime
+	   The time at which the filter is running, expressed in UTC.  It can
+	   accept an argument: a "strftime" C function format string.  The
+	   format string is extended to support the variable %[1-6]N which
+	   prints fractions of the second with optionally specified number of
+	   digits.
+
+       localtime
+	   The time at which the filter is running, expressed in the local
+	   time zone.  It can accept an argument: a "strftime" C function
+	   format string.  The format string is extended to support the
+	   variable %[1-6]N which prints fractions of the second with
+	   optionally specified number of digits.
+
+       metadata
+	   Frame metadata. Takes one or two arguments.
+
+	   The first argument is mandatory and specifies the metadata key.
+
+	   The second argument is optional and specifies a default value, used
+	   when the metadata key is not found or empty.
+
+	   Available metadata can be identified by inspecting entries starting
+	   with TAG included within each frame section printed by running
+	   "ffprobe -show_frames".
+
+	   String metadata generated in filters leading to the drawtext filter
+	   are also available.
+
+       n, frame_num
+	   The frame number, starting from 0.
+
+       pict_type
+	   A one character description of the current picture type.
+
+       pts The timestamp of the current frame.	It can take up to three
+	   arguments.
+
+	   The first argument is the format of the timestamp; it defaults to
+	   "flt" for seconds as a decimal number with microsecond accuracy;
+	   "hms" stands for a formatted [-]HH:MM:SS.mmm timestamp with
+	   millisecond accuracy.  "gmtime" stands for the timestamp of the
+	   frame formatted as UTC time; "localtime" stands for the timestamp
+	   of the frame formatted as local time zone time.
+
+	   The second argument is an offset added to the timestamp.
+
+	   If the format is set to "hms", a third argument "24HH" may be
+	   supplied to present the hour part of the formatted timestamp in 24h
+	   format (00-23).
+
+	   If the format is set to "localtime" or "gmtime", a third argument
+	   may be supplied: a "strftime" C function format string.  By
+	   default, YYYY-MM-DD HH:MM:SS format will be used.
+
+       Commands
+
+       This filter supports altering parameters via commands:
+
+       reinit
+	   Alter existing filter parameters.
+
+	   Syntax for the argument is the same as for filter invocation, e.g.
+
+		   fontsize=56:fontcolor=green:text='Hello World'
+
+	   Full filter invocation with sendcmd would look like this:
+
+		   sendcmd=c='56.0 drawtext reinit fontsize=56\:fontcolor=green\:text=Hello\\ World'
+
+	   If the entire argument can't be parsed or applied as valid values
+	   then the filter will continue with its existing parameters.
+
+       The following options are also supported as commands:
+
+       *<x>
+       *<y>
+       *<alpha>
+       *<fontsize>
+       *<fontcolor>
+       *<boxcolor>
+       *<bordercolor>
+       *<shadowcolor>
+       *<box>
+       *<boxw>
+       *<boxh>
+       *<boxborderw>
+       *<line_spacing>
+       *<text_align>
+       *<shadowx>
+       *<shadowy>
+       *<borderw>
+
+       Examples
+
+       o   Draw "Test Text" with font FreeSerif, using the default values for
+	   the optional parameters.
+
+		   drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text'"
+
+       o   Draw 'Test Text' with font FreeSerif of size 24 at position x=100
+	   and y=50 (counting from the top-left corner of the screen), text is
+	   yellow with a red box around it. Both the text and the box have an
+	   opacity of 20%.
+
+		   drawtext="fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text':\
+			     x=100: y=50: fontsize=24: fontcolor=yellow@0.2: box=1: boxcolor=red@0.2"
+
+	   Note that the double quotes are not necessary if spaces are not
+	   used within the parameter list.
+
+       o   Show the text at the center of the video frame:
+
+		   drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=(w-text_w)/2:y=(h-text_h)/2"
+
+       o   Show the text at a random position, switching to a new position
+	   every 30 seconds:
+
+		   drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=if(eq(mod(t\,30)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(t\,30)\,0)\,rand(0\,(h-text_h))\,y)"
+
+       o   Show a text line sliding from right to left in the last row of the
+	   video frame. The file LONG_LINE is assumed to contain a single line
+	   with no newlines.
+
+		   drawtext="fontsize=15:fontfile=FreeSerif.ttf:text=LONG_LINE:y=h-line_h:x=-50*t"
+
+       o   Show the content of file CREDITS off the bottom of the frame and
+	   scroll up.
+
+		   drawtext="fontsize=20:fontfile=FreeSerif.ttf:textfile=CREDITS:y=h-20*t"
+
+       o   Draw a single green letter "g", at the center of the input video.
+	   The glyph baseline is placed at half screen height.
+
+		   drawtext="fontsize=60:fontfile=FreeSerif.ttf:fontcolor=green:text=g:x=(w-max_glyph_w)/2:y=h/2-ascent"
+
+       o   Show text for 1 second every 3 seconds:
+
+		   drawtext="fontfile=FreeSerif.ttf:fontcolor=white:x=100:y=x/dar:enable=lt(mod(t\,3)\,1):text='blink'"
+
+       o   Use fontconfig to set the font. Note that the colons need to be
+	   escaped.
+
+		   drawtext='fontfile=Linux Libertine O-40\\:style=Semibold:text=FFmpeg'
+
+       o   Draw "Test Text" with font size dependent on height of the video.
+
+		   drawtext="text='Test Text': fontsize=h/30: x=(w-text_w)/2: y=(h-text_h*2)"
+
+       o   Print the date of a real-time encoding (see documentation for the
+	   "strftime" C function):
+
+		   drawtext='fontfile=FreeSans.ttf:text=%{localtime\:%a %b %d %Y}'
+
+       o   Show text fading in and out (appearing/disappearing):
+
+		   #!/bin/sh
+		   DS=1.0 # display start
+		   DE=10.0 # display end
+		   FID=1.5 # fade in duration
+		   FOD=5 # fade out duration
+		   ffplay -f lavfi "color,drawtext=text=TEST:fontsize=50:fontfile=FreeSerif.ttf:fontcolor_expr=ff0000%{eif\\\\: clip(255*(1*between(t\\, $DS + $FID\\, $DE - $FOD) + ((t - $DS)/$FID)*between(t\\, $DS\\, $DS + $FID) + (-(t - $DE)/$FOD)*between(t\\, $DE - $FOD\\, $DE) )\\, 0\\, 255) \\\\: x\\\\: 2 }"
+
+       o   Horizontally align multiple separate texts. Note that max_glyph_a
+	   and the fontsize value are included in the y offset.
+
+		   drawtext=fontfile=FreeSans.ttf:text=DOG:fontsize=24:x=10:y=20+24-max_glyph_a,
+		   drawtext=fontfile=FreeSans.ttf:text=cow:fontsize=24:x=80:y=20+24-max_glyph_a
+
+       o   Plot special lavf.image2dec.source_basename metadata onto each
+	   frame if such metadata exists. Otherwise, plot the string "NA".
+	   Note that image2 demuxer must have option -export_path_metadata 1
+	   for the special metadata fields to be available for filters.
+
+		   drawtext="fontsize=20:fontcolor=white:fontfile=FreeSans.ttf:text='%{metadata\:lavf.image2dec.source_basename\:NA}':x=10:y=10"
+
+       For more information about libfreetype, check:
+       <http://www.freetype.org/>.
+
+       For more information about fontconfig, check:
+       <http://freedesktop.org/software/fontconfig/fontconfig-user.html>.
+
+       For more information about libfribidi, check: <http://fribidi.org/>.
+
+       For more information about libharfbuzz, check:
+       <https://github.com/harfbuzz/harfbuzz>.
+
+   edgedetect
+       Detect and draw edges. The filter uses the Canny Edge Detection
+       algorithm.
+
+       The filter accepts the following options:
+
+       low
+       high
+	   Set low and high threshold values used by the Canny thresholding
+	   algorithm.
+
+	   The high threshold selects the "strong" edge pixels, which are then
+	   connected through 8-connectivity with the "weak" edge pixels
+	   selected by the low threshold.
+
+	   low and high threshold values must be chosen in the range [0,1],
+	   and low should be lesser or equal to high.
+
+	   Default value for low is "20/255", and default value for high is
+	   "50/255".
+
+       mode
+	   Define the drawing mode.
+
+	   wires
+	       Draw white/gray wires on black background.
+
+	   colormix
+	       Mix the colors to create a paint/cartoon effect.
+
+	   canny
+	       Apply Canny edge detector on all selected planes.
+
+	   Default value is wires.
+
+       planes
+	   Select planes for filtering. By default all available planes are
+	   filtered.
+
+       Examples
+
+       o   Standard edge detection with custom values for the hysteresis
+	   thresholding:
+
+		   edgedetect=low=0.1:high=0.4
+
+       o   Painting effect without thresholding:
+
+		   edgedetect=mode=colormix:high=0
+
+   elbg
+       Apply a posterize effect using the ELBG (Enhanced LBG) algorithm.
+
+       For each input image, the filter will compute the optimal mapping from
+       the input to the output given the codebook length, that is the number
+       of distinct output colors.
+
+       This filter accepts the following options.
+
+       codebook_length, l
+	   Set codebook length. The value must be a positive integer, and
+	   represents the number of distinct output colors. Default value is
+	   256.
+
+       nb_steps, n
+	   Set the maximum number of iterations to apply for computing the
+	   optimal mapping. The higher the value the better the result and the
+	   higher the computation time. Default value is 1.
+
+       seed, s
+	   Set a random seed, must be an integer included between 0 and
+	   UINT32_MAX. If not specified, or if explicitly set to -1, the
+	   filter will try to use a good random seed on a best effort basis.
+
+       pal8
+	   Set pal8 output pixel format. This option does not work with
+	   codebook length greater than 256. Default is disabled.
+
+       use_alpha
+	   Include alpha values in the quantization calculation. Allows
+	   creating palettized output images (e.g. PNG8) with multiple alpha
+	   smooth blending.
+
+   entropy
+       Measure graylevel entropy in histogram of color channels of video
+       frames.
+
+       It accepts the following parameters:
+
+       mode
+	   Can be either normal or diff. Default is normal.
+
+	   diff mode measures entropy of histogram delta values, absolute
+	   differences between neighbour histogram values.
+
+   epx
+       Apply the EPX magnification filter which is designed for pixel art.
+
+       It accepts the following option:
+
+       n   Set the scaling dimension: 2 for "2xEPX", 3 for "3xEPX".  Default
+	   is 3.
+
+   eq
+       Set brightness, contrast, saturation and approximate gamma adjustment.
+
+       The filter accepts the following options:
+
+       contrast
+	   Set the contrast expression. The value must be a float value in
+	   range "-1000.0" to 1000.0. The default value is "1".
+
+       brightness
+	   Set the brightness expression. The value must be a float value in
+	   range "-1.0" to 1.0. The default value is "0".
+
+       saturation
+	   Set the saturation expression. The value must be a float in range
+	   0.0 to 3.0. The default value is "1".
+
+       gamma
+	   Set the gamma expression. The value must be a float in range 0.1 to
+	   10.0.  The default value is "1".
+
+       gamma_r
+	   Set the gamma expression for red. The value must be a float in
+	   range 0.1 to 10.0. The default value is "1".
+
+       gamma_g
+	   Set the gamma expression for green. The value must be a float in
+	   range 0.1 to 10.0. The default value is "1".
+
+       gamma_b
+	   Set the gamma expression for blue. The value must be a float in
+	   range 0.1 to 10.0. The default value is "1".
+
+       gamma_weight
+	   Set the gamma weight expression. It can be used to reduce the
+	   effect of a high gamma value on bright image areas, e.g. keep them
+	   from getting overamplified and just plain white. The value must be
+	   a float in range 0.0 to 1.0. A value of 0.0 turns the gamma
+	   correction all the way down while 1.0 leaves it at its full
+	   strength. Default is "1".
+
+       eval
+	   Set when the expressions for brightness, contrast, saturation and
+	   gamma expressions are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       only evaluate expressions once during the filter initialization
+	       or when a command is processed
+
+	   frame
+	       evaluate expressions for each incoming frame
+
+	   Default value is init.
+
+       The expressions accept the following parameters:
+
+       n   frame count of the input frame starting from 0
+
+       pos byte position of the corresponding packet in the input file, NAN if
+	   unspecified; deprecated, do not use
+
+       r   frame rate of the input video, NAN if the input frame rate is
+	   unknown
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       Commands
+
+       The filter supports the following commands:
+
+       contrast
+	   Set the contrast expression.
+
+       brightness
+	   Set the brightness expression.
+
+       saturation
+	   Set the saturation expression.
+
+       gamma
+	   Set the gamma expression.
+
+       gamma_r
+	   Set the gamma_r expression.
+
+       gamma_g
+	   Set gamma_g expression.
+
+       gamma_b
+	   Set gamma_b expression.
+
+       gamma_weight
+	   Set gamma_weight expression.
+
+	   The command accepts the same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   erosion
+       Apply erosion effect to the video.
+
+       This filter replaces the pixel by the local(3x3) minimum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to. Default is 255 i.e. all
+	   eight pixels are used.
+
+	   Flags to local 3x3 coordinates maps like this:
+
+	       1 2 3
+	       4   5
+	       6 7 8
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   estdif
+       Deinterlace the input video ("estdif" stands for "Edge Slope Tracing
+       Deinterlacing Filter").
+
+       Spatial only filter that uses edge slope tracing algorithm to
+       interpolate missing lines.  It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   frame
+	       Output one frame for each frame.
+
+	   field
+	       Output one frame for each field.
+
+	   The default value is "field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   tff Assume the top field is first.
+
+	   bff Assume the bottom field is first.
+
+	   auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   all Deinterlace all frames.
+
+	   interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+       rslope
+	   Specify the search radius for edge slope tracing. Default value is
+	   1.  Allowed range is from 1 to 15.
+
+       redge
+	   Specify the search radius for best edge matching. Default value is
+	   2.  Allowed range is from 0 to 15.
+
+       ecost
+	   Specify the edge cost for edge matching. Default value is 2.
+	   Allowed range is from 0 to 50.
+
+       mcost
+	   Specify the middle cost for edge matching. Default value is 1.
+	   Allowed range is from 0 to 50.
+
+       dcost
+	   Specify the distance cost for edge matching. Default value is 1.
+	   Allowed range is from 0 to 50.
+
+       interp
+	   Specify the interpolation used. Default is 4-point interpolation.
+	   It accepts one of the following values:
+
+	   2p  Two-point interpolation.
+
+	   4p  Four-point interpolation.
+
+	   6p  Six-point interpolation.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   exposure
+       Adjust exposure of the video stream.
+
+       The filter accepts the following options:
+
+       exposure
+	   Set the exposure correction in EV. Allowed range is from -3.0 to
+	   3.0 EV Default value is 0 EV.
+
+       black
+	   Set the black level correction. Allowed range is from -1.0 to 1.0.
+	   Default value is 0.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   extractplanes
+       Extract color channel components from input video stream into separate
+       grayscale video streams.
+
+       The filter accepts the following option:
+
+       planes
+	   Set plane(s) to extract.
+
+	   Available values for planes are:
+
+	   y
+	   u
+	   v
+	   a
+	   r
+	   g
+	   b
+
+	   Choosing planes not available in the input will result in an error.
+	   That means you cannot select "r", "g", "b" planes with "y", "u",
+	   "v" planes at same time.
+
+       Examples
+
+       o   Extract luma, u and v color channel component from input video
+	   frame into 3 grayscale outputs:
+
+		   ffmpeg -i video.avi -filter_complex 'extractplanes=y+u+v[y][u][v]' -map '[y]' y.avi -map '[u]' u.avi -map '[v]' v.avi
+
+   fade
+       Apply a fade-in/out effect to the input video.
+
+       It accepts the following parameters:
+
+       type, t
+	   The effect type can be either "in" for a fade-in, or "out" for a
+	   fade-out effect.  Default is "in".
+
+       start_frame, s
+	   Specify the number of the frame to start applying the fade effect
+	   at. Default is 0.
+
+       nb_frames, n
+	   The number of frames that the fade effect lasts. At the end of the
+	   fade-in effect, the output video will have the same intensity as
+	   the input video.  At the end of the fade-out transition, the output
+	   video will be filled with the selected color.  Default is 25.
+
+       alpha
+	   If set to 1, fade only alpha channel, if one exists on the input.
+	   Default value is 0.
+
+       start_time, st
+	   Specify the timestamp (in seconds) of the frame to start to apply
+	   the fade effect. If both start_frame and start_time are specified,
+	   the fade will start at whichever comes last.  Default is 0.
+
+       duration, d
+	   The number of seconds for which the fade effect has to last. At the
+	   end of the fade-in effect the output video will have the same
+	   intensity as the input video, at the end of the fade-out transition
+	   the output video will be filled with the selected color.  If both
+	   duration and nb_frames are specified, duration is used. Default is
+	   0 (nb_frames is used by default).
+
+       color, c
+	   Specify the color of the fade. Default is "black".
+
+       Examples
+
+       o   Fade in the first 30 frames of video:
+
+		   fade=in:0:30
+
+	   The command above is equivalent to:
+
+		   fade=t=in:s=0:n=30
+
+       o   Fade out the last 45 frames of a 200-frame video:
+
+		   fade=out:155:45
+		   fade=type=out:start_frame=155:nb_frames=45
+
+       o   Fade in the first 25 frames and fade out the last 25 frames of a
+	   1000-frame video:
+
+		   fade=in:0:25, fade=out:975:25
+
+       o   Make the first 5 frames yellow, then fade in from frame 5-24:
+
+		   fade=in:5:20:color=yellow
+
+       o   Fade in alpha over first 25 frames of video:
+
+		   fade=in:0:25:alpha=1
+
+       o   Make the first 5.5 seconds black, then fade in for 0.5 seconds:
+
+		   fade=t=in:st=5.5:d=0.5
+
+   feedback
+       Apply feedback video filter.
+
+       This filter pass cropped input frames to 2nd output.  From there it can
+       be filtered with other video filters.  After filter receives frame from
+       2nd input, that frame is combined on top of original frame from 1st
+       input and passed to 1st output.
+
+       The typical usage is filter only part of frame.
+
+       The filter accepts the following options:
+
+       x
+       y   Set the top left crop position.
+
+       w
+       h   Set the crop size.
+
+       Examples
+
+       o   Blur only top left rectangular part of video frame size 100x100
+	   with gblur filter.
+
+		   [in][blurin]feedback=x=0:y=0:w=100:h=100[out][blurout];[blurout]gblur=8[blurin]
+
+       o   Draw black box on top left part of video frame of size 100x100 with
+	   drawbox filter.
+
+		   [in][blurin]feedback=x=0:y=0:w=100:h=100[out][blurout];[blurout]drawbox=x=0:y=0:w=100:h=100:t=100[blurin]
+
+       o   Pixelize rectangular part of video frame of size 100x100 with
+	   pixelize filter.
+
+		   [in][blurin]feedback=x=320:y=240:w=100:h=100[out][blurout];[blurout]pixelize[blurin]
+
+   fftdnoiz
+       Denoise frames using 3D FFT (frequency domain filtering).
+
+       The filter accepts the following options:
+
+       sigma
+	   Set the noise sigma constant. This sets denoising strength.
+	   Default value is 1. Allowed range is from 0 to 30.  Using very high
+	   sigma with low overlap may give blocking artifacts.
+
+       amount
+	   Set amount of denoising. By default all detected noise is reduced.
+	   Default value is 1. Allowed range is from 0 to 1.
+
+       block
+	   Set size of block in pixels, Default is 32, can be 8 to 256.
+
+       overlap
+	   Set block overlap. Default is 0.5. Allowed range is from 0.2 to
+	   0.8.
+
+       method
+	   Set denoising method. Default is "wiener", can also be "hard".
+
+       prev
+	   Set number of previous frames to use for denoising. By default is
+	   set to 0.
+
+       next
+	   Set number of next frames to to use for denoising. By default is
+	   set to 0.
+
+       planes
+	   Set planes which will be filtered, by default are all available
+	   filtered except alpha.
+
+   fftfilt
+       Apply arbitrary expressions to samples in frequency domain
+
+       dc_Y
+	   Adjust the dc value (gain) of the luma plane of the image. The
+	   filter accepts an integer value in range 0 to 1000. The default
+	   value is set to 0.
+
+       dc_U
+	   Adjust the dc value (gain) of the 1st chroma plane of the image.
+	   The filter accepts an integer value in range 0 to 1000. The default
+	   value is set to 0.
+
+       dc_V
+	   Adjust the dc value (gain) of the 2nd chroma plane of the image.
+	   The filter accepts an integer value in range 0 to 1000. The default
+	   value is set to 0.
+
+       weight_Y
+	   Set the frequency domain weight expression for the luma plane.
+
+       weight_U
+	   Set the frequency domain weight expression for the 1st chroma
+	   plane.
+
+       weight_V
+	   Set the frequency domain weight expression for the 2nd chroma
+	   plane.
+
+       eval
+	   Set when the expressions are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       Only evaluate expressions once during the filter
+	       initialization.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+	   Default value is init.
+
+	   The filter accepts the following variables:
+
+       X
+       Y   The coordinates of the current sample.
+
+       W
+       H   The width and height of the image.
+
+       N   The number of input frame, starting from 0.
+
+       WS
+       HS  The size of FFT array for horizontal and vertical processing.
+
+       Examples
+
+       o   High-pass:
+
+		   fftfilt=dc_Y=128:weight_Y='squish(1-(Y+X)/100)'
+
+       o   Low-pass:
+
+		   fftfilt=dc_Y=0:weight_Y='squish((Y+X)/100-1)'
+
+       o   Sharpen:
+
+		   fftfilt=dc_Y=0:weight_Y='1+squish(1-(Y+X)/100)'
+
+       o   Blur:
+
+		   fftfilt=dc_Y=0:weight_Y='exp(-4 * ((Y+X)/(W+H)))'
+
+   field
+       Extract a single field from an interlaced image using stride arithmetic
+       to avoid wasting CPU time. The output frames are marked as non-
+       interlaced.
+
+       The filter accepts the following options:
+
+       type
+	   Specify whether to extract the top (if the value is 0 or "top") or
+	   the bottom field (if the value is 1 or "bottom").
+
+   fieldhint
+       Create new frames by copying the top and bottom fields from surrounding
+       frames supplied as numbers by the hint file.
+
+       hint
+	   Set file containing hints: absolute/relative frame numbers.
+
+	   There must be one line for each frame in a clip. Each line must
+	   contain two numbers separated by the comma, optionally followed by
+	   "-" or "+".	Numbers supplied on each line of file can not be out
+	   of [N-1,N+1] where N is current frame number for "absolute" mode or
+	   out of [-1, 1] range for "relative" mode. First number tells from
+	   which frame to pick up top field and second number tells from which
+	   frame to pick up bottom field.
+
+	   If optionally followed by "+" output frame will be marked as
+	   interlaced, else if followed by "-" output frame will be marked as
+	   progressive, else it will be marked same as input frame.  If
+	   optionally followed by "t" output frame will use only top field, or
+	   in case of "b" it will use only bottom field.  If line starts with
+	   "#" or ";" that line is skipped.
+
+       mode
+	   Can be item "absolute" or "relative" or "pattern". Default is
+	   "absolute".	The "pattern" mode is same as "relative" mode, except
+	   at last entry of file if there are more frames to process than
+	   "hint" file is seek back to start.
+
+       Example of first several lines of "hint" file for "relative" mode:
+
+	       0,0 - # first frame
+	       1,0 - # second frame, use third's frame top field and second's frame bottom field
+	       1,0 - # third frame, use fourth's frame top field and third's frame bottom field
+	       1,0 -
+	       0,0 -
+	       0,0 -
+	       1,0 -
+	       1,0 -
+	       1,0 -
+	       0,0 -
+	       0,0 -
+	       1,0 -
+	       1,0 -
+	       1,0 -
+	       0,0 -
+
+   fieldmatch
+       Field matching filter for inverse telecine. It is meant to reconstruct
+       the progressive frames from a telecined stream. The filter does not
+       drop duplicated frames, so to achieve a complete inverse telecine
+       "fieldmatch" needs to be followed by a decimation filter such as
+       decimate in the filtergraph.
+
+       The separation of the field matching and the decimation is notably
+       motivated by the possibility of inserting a de-interlacing filter
+       fallback between the two.  If the source has mixed telecined and real
+       interlaced content, "fieldmatch" will not be able to match fields for
+       the interlaced parts.  But these remaining combed frames will be marked
+       as interlaced, and thus can be de-interlaced by a later filter such as
+       yadif before decimation.
+
+       In addition to the various configuration options, "fieldmatch" can take
+       an optional second stream, activated through the ppsrc option. If
+       enabled, the frames reconstruction will be based on the fields and
+       frames from this second stream. This allows the first input to be pre-
+       processed in order to help the various algorithms of the filter, while
+       keeping the output lossless (assuming the fields are matched properly).
+       Typically, a field-aware denoiser, or brightness/contrast adjustments
+       can help.
+
+       Note that this filter uses the same algorithms as TIVTC/TFM (AviSynth
+       project) and VIVTC/VFM (VapourSynth project). The later is a light
+       clone of TFM from which "fieldmatch" is based on. While the semantic
+       and usage are very close, some behaviour and options names can differ.
+
+       The decimate filter currently only works for constant frame rate input.
+       If your input has mixed telecined (30fps) and progressive content with
+       a lower framerate like 24fps use the following filterchain to produce
+       the necessary cfr stream:
+       "dejudder,fps=30000/1001,fieldmatch,decimate".
+
+       The filter accepts the following options:
+
+       order
+	   Specify the assumed field order of the input stream. Available
+	   values are:
+
+	   auto
+	       Auto detect parity (use FFmpeg's internal parity value).
+
+	   bff Assume bottom field first.
+
+	   tff Assume top field first.
+
+	   Note that it is sometimes recommended not to trust the parity
+	   announced by the stream.
+
+	   Default value is auto.
+
+       mode
+	   Set the matching mode or strategy to use. pc mode is the safest in
+	   the sense that it won't risk creating jerkiness due to duplicate
+	   frames when possible, but if there are bad edits or blended fields
+	   it will end up outputting combed frames when a good match might
+	   actually exist. On the other hand, pcn_ub mode is the most risky in
+	   terms of creating jerkiness, but will almost always find a good
+	   frame if there is one. The other values are all somewhere in
+	   between pc and pcn_ub in terms of risking jerkiness and creating
+	   duplicate frames versus finding good matches in sections with bad
+	   edits, orphaned fields, blended fields, etc.
+
+	   More details about p/c/n/u/b are available in p/c/n/u/b meaning
+	   section.
+
+	   Available values are:
+
+	   pc  2-way matching (p/c)
+
+	   pc_n
+	       2-way matching, and trying 3rd match if still combed (p/c + n)
+
+	   pc_u
+	       2-way matching, and trying 3rd match (same order) if still
+	       combed (p/c + u)
+
+	   pc_n_ub
+	       2-way matching, trying 3rd match if still combed, and trying
+	       4th/5th matches if still combed (p/c + n + u/b)
+
+	   pcn 3-way matching (p/c/n)
+
+	   pcn_ub
+	       3-way matching, and trying 4th/5th matches if all 3 of the
+	       original matches are detected as combed (p/c/n + u/b)
+
+	   The parenthesis at the end indicate the matches that would be used
+	   for that mode assuming order=tff (and field on auto or top).
+
+	   In terms of speed pc mode is by far the fastest and pcn_ub is the
+	   slowest.
+
+	   Default value is pc_n.
+
+       ppsrc
+	   Mark the main input stream as a pre-processed input, and enable the
+	   secondary input stream as the clean source to pick the fields from.
+	   See the filter introduction for more details. It is similar to the
+	   clip2 feature from VFM/TFM.
+
+	   Default value is 0 (disabled).
+
+       field
+	   Set the field to match from. It is recommended to set this to the
+	   same value as order unless you experience matching failures with
+	   that setting. In certain circumstances changing the field that is
+	   used to match from can have a large impact on matching performance.
+	   Available values are:
+
+	   auto
+	       Automatic (same value as order).
+
+	   bottom
+	       Match from the bottom field.
+
+	   top Match from the top field.
+
+	   Default value is auto.
+
+       mchroma
+	   Set whether or not chroma is included during the match comparisons.
+	   In most cases it is recommended to leave this enabled. You should
+	   set this to 0 only if your clip has bad chroma problems such as
+	   heavy rainbowing or other artifacts. Setting this to 0 could also
+	   be used to speed things up at the cost of some accuracy.
+
+	   Default value is 1.
+
+       y0
+       y1  These define an exclusion band which excludes the lines between y0
+	   and y1 from being included in the field matching decision. An
+	   exclusion band can be used to ignore subtitles, a logo, or other
+	   things that may interfere with the matching. y0 sets the starting
+	   scan line and y1 sets the ending line; all lines in between y0 and
+	   y1 (including y0 and y1) will be ignored. Setting y0 and y1 to the
+	   same value will disable the feature.  y0 and y1 defaults to 0.
+
+       scthresh
+	   Set the scene change detection threshold as a percentage of maximum
+	   change on the luma plane. Good values are in the "[8.0, 14.0]"
+	   range. Scene change detection is only relevant in case
+	   combmatch=sc.  The range for scthresh is "[0.0, 100.0]".
+
+	   Default value is 12.0.
+
+       combmatch
+	   When combatch is not none, "fieldmatch" will take into account the
+	   combed scores of matches when deciding what match to use as the
+	   final match. Available values are:
+
+	   none
+	       No final matching based on combed scores.
+
+	   sc  Combed scores are only used when a scene change is detected.
+
+	   full
+	       Use combed scores all the time.
+
+	   Default is sc.
+
+       combdbg
+	   Force "fieldmatch" to calculate the combed metrics for certain
+	   matches and print them. This setting is known as micout in TFM/VFM
+	   vocabulary.	Available values are:
+
+	   none
+	       No forced calculation.
+
+	   pcn Force p/c/n calculations.
+
+	   pcnub
+	       Force p/c/n/u/b calculations.
+
+	   Default value is none.
+
+       cthresh
+	   This is the area combing threshold used for combed frame detection.
+	   This essentially controls how "strong" or "visible" combing must be
+	   to be detected.  Larger values mean combing must be more visible
+	   and smaller values mean combing can be less visible or strong and
+	   still be detected. Valid settings are from "-1" (every pixel will
+	   be detected as combed) to 255 (no pixel will be detected as
+	   combed). This is basically a pixel difference value. A good range
+	   is "[8, 12]".
+
+	   Default value is 9.
+
+       chroma
+	   Sets whether or not chroma is considered in the combed frame
+	   decision.  Only disable this if your source has chroma problems
+	   (rainbowing, etc.) that are causing problems for the combed frame
+	   detection with chroma enabled. Actually, using chroma=0 is usually
+	   more reliable, except for the case where there is chroma only
+	   combing in the source.
+
+	   Default value is 0.
+
+       blockx
+       blocky
+	   Respectively set the x-axis and y-axis size of the window used
+	   during combed frame detection. This has to do with the size of the
+	   area in which combpel pixels are required to be detected as combed
+	   for a frame to be declared combed. See the combpel parameter
+	   description for more info.  Possible values are any number that is
+	   a power of 2 starting at 4 and going up to 512.
+
+	   Default value is 16.
+
+       combpel
+	   The number of combed pixels inside any of the blocky by blockx size
+	   blocks on the frame for the frame to be detected as combed. While
+	   cthresh controls how "visible" the combing must be, this setting
+	   controls "how much" combing there must be in any localized area (a
+	   window defined by the blockx and blocky settings) on the frame.
+	   Minimum value is 0 and maximum is "blocky x blockx" (at which point
+	   no frames will ever be detected as combed). This setting is known
+	   as MI in TFM/VFM vocabulary.
+
+	   Default value is 80.
+
+       p/c/n/u/b meaning
+
+       p/c/n
+
+       We assume the following telecined stream:
+
+	       Top fields:     1 2 2 3 4
+	       Bottom fields:  1 2 3 4 4
+
+       The numbers correspond to the progressive frame the fields relate to.
+       Here, the first two frames are progressive, the 3rd and 4th are combed,
+       and so on.
+
+       When "fieldmatch" is configured to run a matching from bottom
+       (field=bottom) this is how this input stream get transformed:
+
+	       Input stream:
+			       T     1 2 2 3 4
+			       B     1 2 3 4 4	 <-- matching reference
+
+	       Matches: 	     c c n n c
+
+	       Output stream:
+			       T     1 2 3 4 4
+			       B     1 2 3 4 4
+
+       As a result of the field matching, we can see that some frames get
+       duplicated.  To perform a complete inverse telecine, you need to rely
+       on a decimation filter after this operation. See for instance the
+       decimate filter.
+
+       The same operation now matching from top fields (field=top) looks like
+       this:
+
+	       Input stream:
+			       T     1 2 2 3 4	 <-- matching reference
+			       B     1 2 3 4 4
+
+	       Matches: 	     c c p p c
+
+	       Output stream:
+			       T     1 2 2 3 4
+			       B     1 2 2 3 4
+
+       In these examples, we can see what p, c and n mean; basically, they
+       refer to the frame and field of the opposite parity:
+
+       *<p matches the field of the opposite parity in the previous frame>
+       *<c matches the field of the opposite parity in the current frame>
+       *<n matches the field of the opposite parity in the next frame>
+
+       u/b
+
+       The u and b matching are a bit special in the sense that they match
+       from the opposite parity flag. In the following examples, we assume
+       that we are currently matching the 2nd frame (Top:2, bottom:2).
+       According to the match, a 'x' is placed above and below each matched
+       fields.
+
+       With bottom matching (field=bottom):
+
+	       Match:		c	  p	      n 	 b	    u
+
+				x	x		x	 x	    x
+		 Top	      1 2 2	1 2 2	    1 2 2      1 2 2	  1 2 2
+		 Bottom       1 2 3	1 2 3	    1 2 3      1 2 3	  1 2 3
+				x	  x	      x        x	      x
+
+	       Output frames:
+				2	   1	      2 	 2	    2
+				2	   2	      2 	 1	    3
+
+       With top matching (field=top):
+
+	       Match:		c	  p	      n 	 b	    u
+
+				x	  x	      x        x	      x
+		 Top	      1 2 2	1 2 2	    1 2 2      1 2 2	  1 2 2
+		 Bottom       1 2 3	1 2 3	    1 2 3      1 2 3	  1 2 3
+				x	x		x	 x	    x
+
+	       Output frames:
+				2	   2	      2 	 1	    2
+				2	   1	      3 	 2	    2
+
+       Examples
+
+       Simple IVTC of a top field first telecined stream:
+
+	       fieldmatch=order=tff:combmatch=none, decimate
+
+       Advanced IVTC, with fallback on yadif for still combed frames:
+
+	       fieldmatch=order=tff:combmatch=full, yadif=deint=interlaced, decimate
+
+   fieldorder
+       Transform the field order of the input video.
+
+       It accepts the following parameters:
+
+       order
+	   The output field order. Valid values are tff for top field first or
+	   bff for bottom field first.
+
+       The default value is tff.
+
+       The transformation is done by shifting the picture content up or down
+       by one line, and filling the remaining line with appropriate picture
+       content.  This method is consistent with most broadcast field order
+       converters.
+
+       If the input video is not flagged as being interlaced, or it is already
+       flagged as being of the required output field order, then this filter
+       does not alter the incoming video.
+
+       It is very useful when converting to or from PAL DV material, which is
+       bottom field first.
+
+       For example:
+
+	       ffmpeg -i in.vob -vf "fieldorder=bff" out.dv
+
+   fillborders
+       Fill borders of the input video, without changing video stream
+       dimensions.  Sometimes video can have garbage at the four edges and you
+       may not want to crop video input to keep size multiple of some number.
+
+       This filter accepts the following options:
+
+       left
+	   Number of pixels to fill from left border.
+
+       right
+	   Number of pixels to fill from right border.
+
+       top Number of pixels to fill from top border.
+
+       bottom
+	   Number of pixels to fill from bottom border.
+
+       mode
+	   Set fill mode.
+
+	   It accepts the following values:
+
+	   smear
+	       fill pixels using outermost pixels
+
+	   mirror
+	       fill pixels using mirroring (half sample symmetric)
+
+	   fixed
+	       fill pixels with constant value
+
+	   reflect
+	       fill pixels using reflecting (whole sample symmetric)
+
+	   wrap
+	       fill pixels using wrapping
+
+	   fade
+	       fade pixels to constant value
+
+	   margins
+	       fill pixels at top and bottom with weighted averages pixels
+	       near borders
+
+	   Default is smear.
+
+       color
+	   Set color for pixels in fixed or fade mode. Default is black.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   find_rect
+       Find a rectangular object in the input video.
+
+       The object to search for must be specified as a gray8 image specified
+       with the object option.
+
+       For each possible match, a score is computed. If the score reaches the
+       specified threshold, the object is considered found.
+
+       If the input video contains multiple instances of the object, the
+       filter will find only one of them.
+
+       When an object is found, the following metadata entries are set in the
+       matching frame:
+
+       lavfi.rect.w
+	   width of object
+
+       lavfi.rect.h
+	   height of object
+
+       lavfi.rect.x
+	   x position of object
+
+       lavfi.rect.y
+	   y position of object
+
+       lavfi.rect.score
+	   match score of the found object
+
+       It accepts the following options:
+
+       object
+	   Filepath of the object image, needs to be in gray8.
+
+       threshold
+	   Detection threshold, expressed as a decimal number in the range
+	   0-1.
+
+	   A threshold value of 0.01 means only exact matches, a threshold of
+	   0.99 means almost everything matches.
+
+	   Default value is 0.5.
+
+       mipmaps
+	   Number of mipmaps, default is 3.
+
+       xmin, ymin, xmax, ymax
+	   Specifies the rectangle in which to search.
+
+       discard
+	   Discard frames where object is not detected. Default is disabled.
+
+       Examples
+
+       o   Cover a rectangular object by the supplied image of a given video
+	   using ffmpeg:
+
+		   ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv
+
+       o   Find the position of an object in each frame using ffprobe and
+	   write it to a log file:
+
+		   ffprobe -f lavfi movie=test.mp4,find_rect=object=object.pgm:threshold=0.3 \
+		     -show_entries frame=pkt_pts_time:frame_tags=lavfi.rect.x,lavfi.rect.y \
+		     -of csv -o find_rect.csv
+
+   floodfill
+       Flood area with values of same pixel components with another values.
+
+       It accepts the following options:
+
+       x   Set pixel x coordinate.
+
+       y   Set pixel y coordinate.
+
+       s0  Set source #0 component value.
+
+       s1  Set source #1 component value.
+
+       s2  Set source #2 component value.
+
+       s3  Set source #3 component value.
+
+       d0  Set destination #0 component value.
+
+       d1  Set destination #1 component value.
+
+       d2  Set destination #2 component value.
+
+       d3  Set destination #3 component value.
+
+   format
+       Convert the input video to one of the specified pixel formats.
+       Libavfilter will try to pick one that is suitable as input to the next
+       filter.
+
+       It accepts the following parameters:
+
+       pix_fmts
+	   A '|'-separated list of pixel format names, such as
+	   "pix_fmts=yuv420p|monow|rgb24".
+
+       color_spaces
+	   A '|'-separated list of color space names, such as
+	   "color_spaces=bt709|bt470bg|bt2020nc".
+
+       color_ranges
+	   A '|'-separated list of color range names, such as
+	   "color_spaces=tv|pc".
+
+       Examples
+
+       o   Convert the input video to the yuv420p format
+
+		   format=pix_fmts=yuv420p
+
+	   Convert the input video to any of the formats in the list
+
+		   format=pix_fmts=yuv420p|yuv444p|yuv410p
+
+   fps
+       Convert the video to specified constant frame rate by duplicating or
+       dropping frames as necessary.
+
+       It accepts the following parameters:
+
+       fps The desired output frame rate. It accepts expressions containing
+	   the following constants:
+
+	   source_fps
+	       The input's frame rate
+
+	   ntsc
+	       NTSC frame rate of "30000/1001"
+
+	   pal PAL frame rate of 25.0
+
+	   film
+	       Film frame rate of 24.0
+
+	   ntsc_film
+	       NTSC-film frame rate of "24000/1001"
+
+	   The default is 25.
+
+       start_time
+	   Assume the first PTS should be the given value, in seconds. This
+	   allows for padding/trimming at the start of stream. By default, no
+	   assumption is made about the first frame's expected PTS, so no
+	   padding or trimming is done.  For example, this could be set to 0
+	   to pad the beginning with duplicates of the first frame if a video
+	   stream starts after the audio stream or to trim any frames with a
+	   negative PTS.
+
+       round
+	   Timestamp (PTS) rounding method.
+
+	   Possible values are:
+
+	   zero
+	       round towards 0
+
+	   inf round away from 0
+
+	   down
+	       round towards -infinity
+
+	   up  round towards +infinity
+
+	   near
+	       round to nearest
+
+	   The default is "near".
+
+       eof_action
+	   Action performed when reading the last frame.
+
+	   Possible values are:
+
+	   round
+	       Use same timestamp rounding method as used for other frames.
+
+	   pass
+	       Pass through last frame if input duration has not been reached
+	       yet.
+
+	   The default is "round".
+
+       Alternatively, the options can be specified as a flat string:
+       fps[:start_time[:round]].
+
+       See also the setpts filter.
+
+       Examples
+
+       o   A typical usage in order to set the fps to 25:
+
+		   fps=fps=25
+
+       o   Sets the fps to 24, using abbreviation and rounding method to round
+	   to nearest:
+
+		   fps=fps=film:round=near
+
+   framepack
+       Pack two different video streams into a stereoscopic video, setting
+       proper metadata on supported codecs. The two views should have the same
+       size and framerate and processing will stop when the shorter video
+       ends. Please note that you may conveniently adjust view properties with
+       the scale and fps filters.
+
+       It accepts the following parameters:
+
+       format
+	   The desired packing format. Supported values are:
+
+	   sbs The views are next to each other (default).
+
+	   tab The views are on top of each other.
+
+	   lines
+	       The views are packed by line.
+
+	   columns
+	       The views are packed by column.
+
+	   frameseq
+	       The views are temporally interleaved.
+
+       Some examples:
+
+	       # Convert left and right views into a frame-sequential video
+	       ffmpeg -i LEFT -i RIGHT -filter_complex framepack=frameseq OUTPUT
+
+	       # Convert views into a side-by-side video with the same output resolution as the input
+	       ffmpeg -i LEFT -i RIGHT -filter_complex [0:v]scale=w=iw/2[left],[1:v]scale=w=iw/2[right],[left][right]framepack=sbs OUTPUT
+
+   framerate
+       Change the frame rate by interpolating new video output frames from the
+       source frames.
+
+       This filter is not designed to function correctly with interlaced
+       media. If you wish to change the frame rate of interlaced media then
+       you are required to deinterlace before this filter and re-interlace
+       after this filter.
+
+       A description of the accepted options follows.
+
+       fps Specify the output frames per second. This option can also be
+	   specified as a value alone. The default is 50.
+
+       interp_start
+	   Specify the start of a range where the output frame will be created
+	   as a linear interpolation of two frames. The range is [0-255], the
+	   default is 15.
+
+       interp_end
+	   Specify the end of a range where the output frame will be created
+	   as a linear interpolation of two frames. The range is [0-255], the
+	   default is 240.
+
+       scene
+	   Specify the level at which a scene change is detected as a value
+	   between 0 and 100 to indicate a new scene; a low value reflects a
+	   low probability for the current frame to introduce a new scene,
+	   while a higher value means the current frame is more likely to be
+	   one.  The default is 8.2.
+
+       flags
+	   Specify flags influencing the filter process.
+
+	   Available value for flags is:
+
+	   scene_change_detect, scd
+	       Enable scene change detection using the value of the option
+	       scene.  This flag is enabled by default.
+
+   framestep
+       Select one frame every N-th frame.
+
+       This filter accepts the following option:
+
+       step
+	   Select frame after every "step" frames.  Allowed values are
+	   positive integers higher than 0. Default value is 1.
+
+   freezedetect
+       Detect frozen video.
+
+       This filter logs a message and sets frame metadata when it detects that
+       the input video has no significant change in content during a specified
+       duration.  Video freeze detection calculates the mean average absolute
+       difference of all the components of video frames and compares it to a
+       noise floor.
+
+       The printed times and duration are expressed in seconds. The
+       "lavfi.freezedetect.freeze_start" metadata key is set on the first
+       frame whose timestamp equals or exceeds the detection duration and it
+       contains the timestamp of the first frame of the freeze. The
+       "lavfi.freezedetect.freeze_duration" and
+       "lavfi.freezedetect.freeze_end" metadata keys are set on the first
+       frame after the freeze.
+
+       The filter accepts the following options:
+
+       noise, n
+	   Set noise tolerance. Can be specified in dB (in case "dB" is
+	   appended to the specified value) or as a difference ratio between 0
+	   and 1. Default is -60dB, or 0.001.
+
+       duration, d
+	   Set freeze duration until notification (default is 2 seconds).
+
+   freezeframes
+       Freeze video frames.
+
+       This filter freezes video frames using frame from 2nd input.
+
+       The filter accepts the following options:
+
+       first
+	   Set number of first frame from which to start freeze.
+
+       last
+	   Set number of last frame from which to end freeze.
+
+       replace
+	   Set number of frame from 2nd input which will be used instead of
+	   replaced frames.
+
+   frei0r
+       Apply a frei0r effect to the input video.
+
+       To enable the compilation of this filter, you need to install the
+       frei0r header and configure FFmpeg with "--enable-frei0r".
+
+       It accepts the following parameters:
+
+       filter_name
+	   The name of the frei0r effect to load. If the environment variable
+	   FREI0R_PATH is defined, the frei0r effect is searched for in each
+	   of the directories specified by the colon-separated list in
+	   FREI0R_PATH.  Otherwise, the standard frei0r paths are searched, in
+	   this order: HOME/.frei0r-1/lib/, /usr/local/lib/frei0r-1/,
+	   /usr/lib/frei0r-1/.
+
+       filter_params
+	   A '|'-separated list of parameters to pass to the frei0r effect.
+
+       A frei0r effect parameter can be a boolean (its value is either "y" or
+       "n"), a double, a color (specified as R/G/B, where R, G, and B are
+       floating point numbers between 0.0 and 1.0, inclusive) or a color
+       description as specified in the "Color" section in the ffmpeg-utils
+       manual, a position (specified as X/Y, where X and Y are floating point
+       numbers) and/or a string.
+
+       The number and types of parameters depend on the loaded effect. If an
+       effect parameter is not specified, the default value is set.
+
+       Examples
+
+       o   Apply the distort0r effect, setting the first two double
+	   parameters:
+
+		   frei0r=filter_name=distort0r:filter_params=0.5|0.01
+
+       o   Apply the colordistance effect, taking a color as the first
+	   parameter:
+
+		   frei0r=colordistance:0.2/0.3/0.4
+		   frei0r=colordistance:violet
+		   frei0r=colordistance:0x112233
+
+       o   Apply the perspective effect, specifying the top left and top right
+	   image positions:
+
+		   frei0r=perspective:0.2/0.2|0.8/0.2
+
+       For more information, see <http://frei0r.dyne.org>
+
+       Commands
+
+       This filter supports the filter_params option as commands.
+
+   fspp
+       Apply fast and simple postprocessing. It is a faster version of spp.
+
+       It splits (I)DCT into horizontal/vertical passes. Unlike the simple
+       post- processing filter, one of them is performed once per block, not
+       per pixel.  This allows for much higher speed.
+
+       The filter accepts the following options:
+
+       quality
+	   Set quality. This option defines the number of levels for
+	   averaging. It accepts an integer in the range 4-5. Default value is
+	   4.
+
+       qp  Force a constant quantization parameter. It accepts an integer in
+	   range 0-63.	If not set, the filter will use the QP from the video
+	   stream (if available).
+
+       strength
+	   Set filter strength. It accepts an integer in range -15 to 32.
+	   Lower values mean more details but also more artifacts, while
+	   higher values make the image smoother but also blurrier. Default
+	   value is 0 X PSNR optimal.
+
+       use_bframe_qp
+	   Enable the use of the QP from the B-Frames if set to 1. Using this
+	   option may cause flicker since the B-Frames have often larger QP.
+	   Default is 0 (not enabled).
+
+   fsync
+       Synchronize video frames with an external mapping from a file.
+
+       For each input PTS given in the map file it either drops or creates as
+       many frames as necessary to recreate the sequence of output frames
+       given in the map file.
+
+       This filter is useful to recreate the output frames of a framerate
+       conversion by the fps filter, recorded into a map file using the ffmpeg
+       option "-stats_mux_pre", and do further processing to the corresponding
+       frames e.g. quality comparison.
+
+       Each line of the map file must contain three items per input frame, the
+       input PTS (decimal), the output PTS (decimal) and the output TIMEBASE
+       (decimal/decimal), seperated by a space.  This file format corresponds
+       to the output of "-stats_mux_pre_fmt="{ptsi} {pts} {tb}"".
+
+       The filter assumes the map file is sorted by increasing input PTS.
+
+       The filter accepts the following options:
+
+       file, f
+	   The filename of the map file to be used.
+
+       Example:
+
+	       # Convert a video to 25 fps and record a MAP_FILE file with the default format of this filter
+	       ffmpeg -i INPUT -vf fps=fps=25 -stats_mux_pre MAP_FILE -stats_mux_pre_fmt "{ptsi} {pts} {tb}" OUTPUT
+
+	       # Sort MAP_FILE by increasing input PTS
+	       sort -n MAP_FILE
+
+	       # Use INPUT, OUTPUT and the MAP_FILE from above to compare the corresponding frames in INPUT and OUTPUT via SSIM
+	       ffmpeg -i INPUT -i OUTPUT -filter_complex '[0:v]fsync=file=MAP_FILE[ref];[1:v][ref]ssim' -f null -
+
+   gblur
+       Apply Gaussian blur filter.
+
+       The filter accepts the following options:
+
+       sigma
+	   Set horizontal sigma, standard deviation of Gaussian blur. Default
+	   is 0.5.
+
+       steps
+	   Set number of steps for Gaussian approximation. Default is 1.
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       sigmaV
+	   Set vertical sigma, if negative it will be same as "sigma".
+	   Default is "-1".
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   geq
+       Apply generic equation to each pixel.
+
+       The filter accepts the following options:
+
+       lum_expr, lum
+	   Set the luma expression.
+
+       cb_expr, cb
+	   Set the chrominance blue expression.
+
+       cr_expr, cr
+	   Set the chrominance red expression.
+
+       alpha_expr, a
+	   Set the alpha expression.
+
+       red_expr, r
+	   Set the red expression.
+
+       green_expr, g
+	   Set the green expression.
+
+       blue_expr, b
+	   Set the blue expression.
+
+       The colorspace is selected according to the specified options. If one
+       of the lum_expr, cb_expr, or cr_expr options is specified, the filter
+       will automatically select a YCbCr colorspace. If one of the red_expr,
+       green_expr, or blue_expr options is specified, it will select an RGB
+       colorspace.
+
+       If one of the chrominance expression is not defined, it falls back on
+       the other one. If no alpha expression is specified it will evaluate to
+       opaque value.  If none of chrominance expressions are specified, they
+       will evaluate to the luma expression.
+
+       The expressions can use the following variables and functions:
+
+       N   The sequential number of the filtered frame, starting from 0.
+
+       X
+       Y   The coordinates of the current sample.
+
+       W
+       H   The width and height of the image.
+
+       SW
+       SH  Width and height scale depending on the currently filtered plane.
+	   It is the ratio between the corresponding luma plane number of
+	   pixels and the current plane ones. E.g. for YUV4:2:0 the values are
+	   "1,1" for the luma plane, and "0.5,0.5" for chroma planes.
+
+       T   Time of the current frame, expressed in seconds.
+
+       p(x, y)
+	   Return the value of the pixel at location (x,y) of the current
+	   plane.
+
+       lum(x, y)
+	   Return the value of the pixel at location (x,y) of the luma plane.
+
+       cb(x, y)
+	   Return the value of the pixel at location (x,y) of the blue-
+	   difference chroma plane. Return 0 if there is no such plane.
+
+       cr(x, y)
+	   Return the value of the pixel at location (x,y) of the red-
+	   difference chroma plane. Return 0 if there is no such plane.
+
+       r(x, y)
+       g(x, y)
+       b(x, y)
+	   Return the value of the pixel at location (x,y) of the
+	   red/green/blue component. Return 0 if there is no such component.
+
+       alpha(x, y)
+	   Return the value of the pixel at location (x,y) of the alpha plane.
+	   Return 0 if there is no such plane.
+
+       psum(x,y), lumsum(x, y), cbsum(x,y), crsum(x,y), rsum(x,y), gsum(x,y),
+       bsum(x,y), alphasum(x,y)
+	   Sum of sample values in the rectangle from (0,0) to (x,y), this
+	   allows obtaining sums of samples within a rectangle. See the
+	   functions without the sum postfix.
+
+       interpolation
+	   Set one of interpolation methods:
+
+	   nearest, n
+	   bilinear, b
+
+	   Default is bilinear.
+
+       For functions, if x and y are outside the area, the value will be
+       automatically clipped to the closer edge.
+
+       Please note that this filter can use multiple threads in which case
+       each slice will have its own expression state. If you want to use only
+       a single expression state because your expressions depend on previous
+       state then you should limit the number of filter threads to 1.
+
+       Examples
+
+       o   Flip the image horizontally:
+
+		   geq=p(W-X\,Y)
+
+       o   Generate a bidimensional sine wave, with angle "PI/3" and a
+	   wavelength of 100 pixels:
+
+		   geq=128 + 100*sin(2*(PI/100)*(cos(PI/3)*(X-50*T) + sin(PI/3)*Y)):128:128
+
+       o   Generate a fancy enigmatic moving light:
+
+		   nullsrc=s=256x256,geq=random(1)/hypot(X-cos(N*0.07)*W/2-W/2\,Y-sin(N*0.09)*H/2-H/2)^2*1000000*sin(N*0.02):128:128
+
+       o   Generate a quick emboss effect:
+
+		   format=gray,geq=lum_expr='(p(X,Y)+(256-p(X-4,Y-4)))/2'
+
+       o   Modify RGB components depending on pixel position:
+
+		   geq=r='X/W*r(X,Y)':g='(1-X/W)*g(X,Y)':b='(H-Y)/H*b(X,Y)'
+
+       o   Create a radial gradient that is the same size as the input (also
+	   see the vignette filter):
+
+		   geq=lum=255*gauss((X/W-0.5)*3)*gauss((Y/H-0.5)*3)/gauss(0)/gauss(0),format=gray
+
+   gradfun
+       Fix the banding artifacts that are sometimes introduced into nearly
+       flat regions by truncation to 8-bit color depth.  Interpolate the
+       gradients that should go where the bands are, and dither them.
+
+       It is designed for playback only.  Do not use it prior to lossy
+       compression, because compression tends to lose the dither and bring
+       back the bands.
+
+       It accepts the following parameters:
+
+       strength
+	   The maximum amount by which the filter will change any one pixel.
+	   This is also the threshold for detecting nearly flat regions.
+	   Acceptable values range from .51 to 64; the default value is 1.2.
+	   Out-of-range values will be clipped to the valid range.
+
+       radius
+	   The neighborhood to fit the gradient to. A larger radius makes for
+	   smoother gradients, but also prevents the filter from modifying the
+	   pixels near detailed regions. Acceptable values are 8-32; the
+	   default value is 16. Out-of-range values will be clipped to the
+	   valid range.
+
+       Alternatively, the options can be specified as a flat string:
+       strength[:radius]
+
+       Examples
+
+       o   Apply the filter with a 3.5 strength and radius of 8:
+
+		   gradfun=3.5:8
+
+       o   Specify radius, omitting the strength (which will fall-back to the
+	   default value):
+
+		   gradfun=radius=8
+
+   graphmonitor
+       Show various filtergraph stats.
+
+       With this filter one can debug complete filtergraph.  Especially issues
+       with links filling with queued frames.
+
+       The filter accepts the following options:
+
+       size, s
+	   Set video output size. Default is hd720.
+
+       opacity, o
+	   Set video opacity. Default is 0.9. Allowed range is from 0 to 1.
+
+       mode, m
+	   Set output mode flags.
+
+	   Available values for flags are:
+
+	   full
+	       No any filtering. Default.
+
+	   compact
+	       Show only filters with queued frames.
+
+	   nozero
+	       Show only filters with non-zero stats.
+
+	   noeof
+	       Show only filters with non-eof stat.
+
+	   nodisabled
+	       Show only filters that are enabled in timeline.
+
+       flags, f
+	   Set flags which enable which stats are shown in video.
+
+	   Available values for flags are:
+
+	   none
+	       All flags turned off.
+
+	   all All flags turned on.
+
+	   queue
+	       Display number of queued frames in each link.
+
+	   frame_count_in
+	       Display number of frames taken from filter.
+
+	   frame_count_out
+	       Display number of frames given out from filter.
+
+	   frame_count_delta
+	       Display delta number of frames between above two values.
+
+	   pts Display current filtered frame pts.
+
+	   pts_delta
+	       Display pts delta between current and previous frame.
+
+	   time
+	       Display current filtered frame time.
+
+	   time_delta
+	       Display time delta between current and previous frame.
+
+	   timebase
+	       Display time base for filter link.
+
+	   format
+	       Display used format for filter link.
+
+	   size
+	       Display video size or number of audio channels in case of audio
+	       used by filter link.
+
+	   rate
+	       Display video frame rate or sample rate in case of audio used
+	       by filter link.
+
+	   eof Display link output status.
+
+	   sample_count_in
+	       Display number of samples taken from filter.
+
+	   sample_count_out
+	       Display number of samples given out from filter.
+
+	   sample_count_delta
+	       Display delta number of samples between above two values.
+
+	   disabled
+	       Show the timeline filter status.
+
+       rate, r
+	   Set upper limit for video rate of output stream, Default value is
+	   25.	This guarantee that output video frame rate will not be higher
+	   than this value.
+
+   grayworld
+       A color constancy filter that applies color correction based on the
+       grayworld assumption
+
+       See:
+       <https://www.researchgate.net/publication/275213614_A_New_Color_Correction_Method_for_Underwater_Imaging>
+
+       The algorithm  uses linear light, so input data should be linearized
+       beforehand (and possibly correctly tagged).
+
+	       ffmpeg -i INPUT -vf zscale=transfer=linear,grayworld,zscale=transfer=bt709,format=yuv420p OUTPUT
+
+   greyedge
+       A color constancy variation filter which estimates scene illumination
+       via grey edge algorithm and corrects the scene colors accordingly.
+
+       See: <https://staff.science.uva.nl/th.gevers/pub/GeversTIP07.pdf>
+
+       The filter accepts the following options:
+
+       difford
+	   The order of differentiation to be applied on the scene. Must be
+	   chosen in the range [0,2] and default value is 1.
+
+       minknorm
+	   The Minkowski parameter to be used for calculating the Minkowski
+	   distance. Must be chosen in the range [0,20] and default value is
+	   1. Set to 0 for getting max value instead of calculating Minkowski
+	   distance.
+
+       sigma
+	   The standard deviation of Gaussian blur to be applied on the scene.
+	   Must be chosen in the range [0,1024.0] and default value = 1.
+	   floor( sigma * break_off_sigma(3) ) can't be equal to 0 if difford
+	   is greater than 0.
+
+       Examples
+
+       o   Grey Edge:
+
+		   greyedge=difford=1:minknorm=5:sigma=2
+
+       o   Max Edge:
+
+		   greyedge=difford=1:minknorm=0:sigma=2
+
+   guided
+       Apply guided filter for edge-preserving smoothing, dehazing and so on.
+
+       The filter accepts the following options:
+
+       radius
+	   Set the box radius in pixels.  Allowed range is 1 to 20. Default is
+	   3.
+
+       eps Set regularization parameter (with square).	Allowed range is 0 to
+	   1. Default is 0.01.
+
+       mode
+	   Set filter mode. Can be "basic" or "fast".  Default is "basic".
+
+       sub Set subsampling ratio for "fast" mode.  Range is 2 to 64. Default
+	   is 4.  No subsampling occurs in "basic" mode.
+
+       guidance
+	   Set guidance mode. Can be "off" or "on". Default is "off".  If
+	   "off", single input is required.  If "on", two inputs of the same
+	   resolution and pixel format are required.  The second input serves
+	   as the guidance.
+
+       planes
+	   Set planes to filter. Default is first only.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Edge-preserving smoothing with guided filter:
+
+		   ffmpeg -i in.png -vf guided out.png
+
+       o   Dehazing, structure-transferring filtering, detail enhancement with
+	   guided filter.  For the generation of guidance image, refer to
+	   paper "Guided Image Filtering".  See:
+	   <http://kaiminghe.com/publications/pami12guidedfilter.pdf>.
+
+		   ffmpeg -i in.png -i guidance.png -filter_complex guided=guidance=on out.png
+
+   haldclut
+       Apply a Hald CLUT to a video stream.
+
+       First input is the video stream to process, and second one is the Hald
+       CLUT.  The Hald CLUT input can be a simple picture or a complete video
+       stream.
+
+       The filter accepts the following options:
+
+       clut
+	   Set which CLUT video frames will be processed from second input
+	   stream, can be first or all. Default is all.
+
+       shortest
+	   Force termination when the shortest input terminates. Default is 0.
+
+       repeatlast
+	   Continue applying the last CLUT after the end of the stream. A
+	   value of 0 disable the filter after the last frame of the CLUT is
+	   reached.  Default is 1.
+
+       "haldclut" also has the same interpolation options as lut3d (both
+       filters share the same internals).
+
+       This filter also supports the framesync options.
+
+       More information about the Hald CLUT can be found on Eskil Steenberg's
+       website (Hald CLUT author) at
+       <http://www.quelsolaar.com/technology/clut.html>.
+
+       Commands
+
+       This filter supports the "interp" option as commands.
+
+       Workflow examples
+
+       Hald CLUT video stream
+
+       Generate an identity Hald CLUT stream altered with various effects:
+
+	       ffmpeg -f lavfi -i B<haldclutsrc>=8 -vf "hue=H=2*PI*t:s=sin(2*PI*t)+1, curves=cross_process" -t 10 -c:v ffv1 clut.nut
+
+       Note: make sure you use a lossless codec.
+
+       Then use it with "haldclut" to apply it on some random stream:
+
+	       ffmpeg -f lavfi -i mandelbrot -i clut.nut -filter_complex '[0][1] haldclut' -t 20 mandelclut.mkv
+
+       The Hald CLUT will be applied to the 10 first seconds (duration of
+       clut.nut), then the latest picture of that CLUT stream will be applied
+       to the remaining frames of the "mandelbrot" stream.
+
+       Hald CLUT with preview
+
+       A Hald CLUT is supposed to be a squared image of "Level*Level*Level" by
+       "Level*Level*Level" pixels. For a given Hald CLUT, FFmpeg will select
+       the biggest possible square starting at the top left of the picture.
+       The remaining padding pixels (bottom or right) will be ignored. This
+       area can be used to add a preview of the Hald CLUT.
+
+       Typically, the following generated Hald CLUT will be supported by the
+       "haldclut" filter:
+
+	       ffmpeg -f lavfi -i B<haldclutsrc>=8 -vf "
+		  pad=iw+320 [padded_clut];
+		  smptebars=s=320x256, split [a][b];
+		  [padded_clut][a] overlay=W-320:h, curves=color_negative [main];
+		  [main][b] overlay=W-320" -frames:v 1 clut.png
+
+       It contains the original and a preview of the effect of the CLUT: SMPTE
+       color bars are displayed on the right-top, and below the same color
+       bars processed by the color changes.
+
+       Then, the effect of this Hald CLUT can be visualized with:
+
+	       ffplay input.mkv -vf "movie=clut.png, [in] haldclut"
+
+   hflip
+       Flip the input video horizontally.
+
+       For example, to horizontally flip the input video with ffmpeg:
+
+	       ffmpeg -i in.avi -vf "hflip" out.avi
+
+   histeq
+       This filter applies a global color histogram equalization on a per-
+       frame basis.
+
+       It can be used to correct video that has a compressed range of pixel
+       intensities.  The filter redistributes the pixel intensities to
+       equalize their distribution across the intensity range. It may be
+       viewed as an "automatically adjusting contrast filter". This filter is
+       useful only for correcting degraded or poorly captured source video.
+
+       The filter accepts the following options:
+
+       strength
+	   Determine the amount of equalization to be applied.	As the
+	   strength is reduced, the distribution of pixel intensities more-
+	   and-more approaches that of the input frame. The value must be a
+	   float number in the range [0,1] and defaults to 0.200.
+
+       intensity
+	   Set the maximum intensity that can generated and scale the output
+	   values appropriately.  The strength should be set as desired and
+	   then the intensity can be limited if needed to avoid washing-out.
+	   The value must be a float number in the range [0,1] and defaults to
+	   0.210.
+
+       antibanding
+	   Set the antibanding level. If enabled the filter will randomly vary
+	   the luminance of output pixels by a small amount to avoid banding
+	   of the histogram. Possible values are "none", "weak" or "strong".
+	   It defaults to "none".
+
+   histogram
+       Compute and draw a color distribution histogram for the input video.
+
+       The computed histogram is a representation of the color component
+       distribution in an image.
+
+       Standard histogram displays the color components distribution in an
+       image.  Displays color graph for each color component. Shows
+       distribution of the Y, U, V, A or R, G, B components, depending on
+       input format, in the current frame. Below each graph a color component
+       scale meter is shown.
+
+       The filter accepts the following options:
+
+       level_height
+	   Set height of level. Default value is 200.  Allowed range is [50,
+	   2048].
+
+       scale_height
+	   Set height of color scale. Default value is 12.  Allowed range is
+	   [0, 40].
+
+       display_mode
+	   Set display mode.  It accepts the following values:
+
+	   stack
+	       Per color component graphs are placed below each other.
+
+	   parade
+	       Per color component graphs are placed side by side.
+
+	   overlay
+	       Presents information identical to that in the "parade", except
+	       that the graphs representing color components are superimposed
+	       directly over one another.
+
+	   Default is "stack".
+
+       levels_mode
+	   Set mode. Can be either "linear", or "logarithmic".	Default is
+	   "linear".
+
+       components
+	   Set what color components to display.  Default is 7.
+
+       fgopacity
+	   Set foreground opacity. Default is 0.7.
+
+       bgopacity
+	   Set background opacity. Default is 0.5.
+
+       colors_mode
+	   Set colors mode.  It accepts the following values:
+
+	   whiteonblack
+	   blackonwhite
+	   whiteongray
+	   blackongray
+	   coloronblack
+	   coloronwhite
+	   colorongray
+	   blackoncolor
+	   whiteoncolor
+	   grayoncolor
+
+	   Default is "whiteonblack".
+
+       Examples
+
+       o   Calculate and draw histogram:
+
+		   ffplay -i input -vf histogram
+
+   hqdn3d
+       This is a high precision/quality 3d denoise filter. It aims to reduce
+       image noise, producing smooth images and making still images really
+       still. It should enhance compressibility.
+
+       It accepts the following optional parameters:
+
+       luma_spatial
+	   A non-negative floating point number which specifies spatial luma
+	   strength.  It defaults to 4.0.
+
+       chroma_spatial
+	   A non-negative floating point number which specifies spatial chroma
+	   strength.  It defaults to 3.0*luma_spatial/4.0.
+
+       luma_tmp
+	   A floating point number which specifies luma temporal strength. It
+	   defaults to 6.0*luma_spatial/4.0.
+
+       chroma_tmp
+	   A floating point number which specifies chroma temporal strength.
+	   It defaults to luma_tmp*chroma_spatial/luma_spatial.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   hwdownload
+       Download hardware frames to system memory.
+
+       The input must be in hardware frames, and the output a non-hardware
+       format.	Not all formats will be supported on the output - it may be
+       necessary to insert an additional format filter immediately following
+       in the graph to get the output in a supported format.
+
+   hwmap
+       Map hardware frames to system memory or to another device.
+
+       This filter has several different modes of operation; which one is used
+       depends on the input and output formats:
+
+       o   Hardware frame input, normal frame output
+
+	   Map the input frames to system memory and pass them to the output.
+	   If the original hardware frame is later required (for example,
+	   after overlaying something else on part of it), the hwmap filter
+	   can be used again in the next mode to retrieve it.
+
+       o   Normal frame input, hardware frame output
+
+	   If the input is actually a software-mapped hardware frame, then
+	   unmap it - that is, return the original hardware frame.
+
+	   Otherwise, a device must be provided.  Create new hardware surfaces
+	   on that device for the output, then map them back to the software
+	   format at the input and give those frames to the preceding filter.
+	   This will then act like the hwupload filter, but may be able to
+	   avoid an additional copy when the input is already in a compatible
+	   format.
+
+       o   Hardware frame input and output
+
+	   A device must be supplied for the output, either directly or with
+	   the derive_device option.  The input and output devices must be of
+	   different types and compatible - the exact meaning of this is
+	   system-dependent, but typically it means that they must refer to
+	   the same underlying hardware context (for example, refer to the
+	   same graphics card).
+
+	   If the input frames were originally created on the output device,
+	   then unmap to retrieve the original frames.
+
+	   Otherwise, map the frames to the output device - create new
+	   hardware frames on the output corresponding to the frames on the
+	   input.
+
+       The following additional parameters are accepted:
+
+       mode
+	   Set the frame mapping mode.	Some combination of:
+
+	   read
+	       The mapped frame should be readable.
+
+	   write
+	       The mapped frame should be writeable.
+
+	   overwrite
+	       The mapping will always overwrite the entire frame.
+
+	       This may improve performance in some cases, as the original
+	       contents of the frame need not be loaded.
+
+	   direct
+	       The mapping must not involve any copying.
+
+	       Indirect mappings to copies of frames are created in some cases
+	       where either direct mapping is not possible or it would have
+	       unexpected properties.  Setting this flag ensures that the
+	       mapping is direct and will fail if that is not possible.
+
+	   Defaults to read+write if not specified.
+
+       derive_device type
+	   Rather than using the device supplied at initialisation, instead
+	   derive a new device of type type from the device the input frames
+	   exist on.
+
+       reverse
+	   In a hardware to hardware mapping, map in reverse - create frames
+	   in the sink and map them back to the source.  This may be necessary
+	   in some cases where a mapping in one direction is required but only
+	   the opposite direction is supported by the devices being used.
+
+	   This option is dangerous - it may break the preceding filter in
+	   undefined ways if there are any additional constraints on that
+	   filter's output.  Do not use it without fully understanding the
+	   implications of its use.
+
+   hwupload
+       Upload system memory frames to hardware surfaces.
+
+       The device to upload to must be supplied when the filter is
+       initialised.  If using ffmpeg, select the appropriate device with the
+       -filter_hw_device option or with the derive_device option.  The input
+       and output devices must be of different types and compatible - the
+       exact meaning of this is system-dependent, but typically it means that
+       they must refer to the same underlying hardware context (for example,
+       refer to the same graphics card).
+
+       The following additional parameters are accepted:
+
+       derive_device type
+	   Rather than using the device supplied at initialisation, instead
+	   derive a new device of type type from the device the input frames
+	   exist on.
+
+   hwupload_cuda
+       Upload system memory frames to a CUDA device.
+
+       It accepts the following optional parameters:
+
+       device
+	   The number of the CUDA device to use
+
+   hqx
+       Apply a high-quality magnification filter designed for pixel art. This
+       filter was originally created by Maxim Stepin.
+
+       It accepts the following option:
+
+       n   Set the scaling dimension: 2 for "hq2x", 3 for "hq3x" and 4 for
+	   "hq4x".  Default is 3.
+
+   hstack
+       Stack input videos horizontally.
+
+       All streams must be of same pixel format and of same height.
+
+       Note that this filter is faster than using overlay and pad filter to
+       create same output.
+
+       The filter accepts the following option:
+
+       inputs
+	   Set number of input streams. Default is 2.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+   hsvhold
+       Turns a certain HSV range into gray values.
+
+       This filter measures color difference between set HSV color in options
+       and ones measured in video stream. Depending on options, output colors
+       can be changed to be gray or not.
+
+       The filter accepts the following options:
+
+       hue Set the hue value which will be used in color difference
+	   calculation.  Allowed range is from -360 to 360. Default value is
+	   0.
+
+       sat Set the saturation value which will be used in color difference
+	   calculation.  Allowed range is from -1 to 1. Default value is 0.
+
+       val Set the value which will be used in color difference calculation.
+	   Allowed range is from -1 to 1. Default value is 0.
+
+       similarity
+	   Set similarity percentage with the key color.  Allowed range is
+	   from 0 to 1. Default value is 0.01.
+
+	   0.00001 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.  Allowed range is from 0 to 1. Default value is
+	   0.
+
+	   0.0 makes pixels either fully gray, or not gray at all.
+
+	   Higher values result in more gray pixels, with a higher gray pixel
+	   the more similar the pixels color is to the key color.
+
+   hsvkey
+       Turns a certain HSV range into transparency.
+
+       This filter measures color difference between set HSV color in options
+       and ones measured in video stream. Depending on options, output colors
+       can be changed to transparent by adding alpha channel.
+
+       The filter accepts the following options:
+
+       hue Set the hue value which will be used in color difference
+	   calculation.  Allowed range is from -360 to 360. Default value is
+	   0.
+
+       sat Set the saturation value which will be used in color difference
+	   calculation.  Allowed range is from -1 to 1. Default value is 0.
+
+       val Set the value which will be used in color difference calculation.
+	   Allowed range is from -1 to 1. Default value is 0.
+
+       similarity
+	   Set similarity percentage with the key color.  Allowed range is
+	   from 0 to 1. Default value is 0.01.
+
+	   0.00001 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.  Allowed range is from 0 to 1. Default value is
+	   0.
+
+	   0.0 makes pixels either fully transparent, or not transparent at
+	   all.
+
+	   Higher values result in semi-transparent pixels, with a higher
+	   transparency the more similar the pixels color is to the key color.
+
+   hue
+       Modify the hue and/or the saturation of the input.
+
+       It accepts the following parameters:
+
+       h   Specify the hue angle as a number of degrees. It accepts an
+	   expression, and defaults to "0".
+
+       s   Specify the saturation in the [-10,10] range. It accepts an
+	   expression and defaults to "1".
+
+       H   Specify the hue angle as a number of radians. It accepts an
+	   expression, and defaults to "0".
+
+       b   Specify the brightness in the [-10,10] range. It accepts an
+	   expression and defaults to "0".
+
+       h and H are mutually exclusive, and can't be specified at the same
+       time.
+
+       The b, h, H and s option values are expressions containing the
+       following constants:
+
+       n   frame count of the input frame starting from 0
+
+       pts presentation timestamp of the input frame expressed in time base
+	   units
+
+       r   frame rate of the input video, NAN if the input frame rate is
+	   unknown
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       tb  time base of the input video
+
+       Examples
+
+       o   Set the hue to 90 degrees and the saturation to 1.0:
+
+		   hue=h=90:s=1
+
+       o   Same command but expressing the hue in radians:
+
+		   hue=H=PI/2:s=1
+
+       o   Rotate hue and make the saturation swing between 0 and 2 over a
+	   period of 1 second:
+
+		   hue="H=2*PI*t: s=sin(2*PI*t)+1"
+
+       o   Apply a 3 seconds saturation fade-in effect starting at 0:
+
+		   hue="s=min(t/3\,1)"
+
+	   The general fade-in expression can be written as:
+
+		   hue="s=min(0\, max((t-START)/DURATION\, 1))"
+
+       o   Apply a 3 seconds saturation fade-out effect starting at 5 seconds:
+
+		   hue="s=max(0\, min(1\, (8-t)/3))"
+
+	   The general fade-out expression can be written as:
+
+		   hue="s=max(0\, min(1\, (START+DURATION-t)/DURATION))"
+
+       Commands
+
+       This filter supports the following commands:
+
+       b
+       s
+       h
+       H   Modify the hue and/or the saturation and/or brightness of the input
+	   video.  The command accepts the same syntax of the corresponding
+	   option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   huesaturation
+       Apply hue-saturation-intensity adjustments to input video stream.
+
+       This filter operates in RGB colorspace.
+
+       This filter accepts the following options:
+
+       hue Set the hue shift in degrees to apply. Default is 0.  Allowed range
+	   is from -180 to 180.
+
+       saturation
+	   Set the saturation shift. Default is 0.  Allowed range is from -1
+	   to 1.
+
+       intensity
+	   Set the intensity shift. Default is 0.  Allowed range is from -1 to
+	   1.
+
+       colors
+	   Set which primary and complementary colors are going to be
+	   adjusted.  This options is set by providing one or multiple values.
+	   This can select multiple colors at once. By default all colors are
+	   selected.
+
+	   r   Adjust reds.
+
+	   y   Adjust yellows.
+
+	   g   Adjust greens.
+
+	   c   Adjust cyans.
+
+	   b   Adjust blues.
+
+	   m   Adjust magentas.
+
+	   a   Adjust all colors.
+
+       strength
+	   Set strength of filtering. Allowed range is from 0 to 100.  Default
+	   value is 1.
+
+       rw, gw, bw
+	   Set weight for each RGB component. Allowed range is from 0 to 1.
+	   By default is set to 0.333, 0.334, 0.333.  Those options are used
+	   in saturation and lightess processing.
+
+       lightness
+	   Set preserving lightness, by default is disabled.  Adjusting hues
+	   can change lightness from original RGB triplet, with this option
+	   enabled lightness is kept at same value.
+
+   hysteresis
+       Grow first stream into second stream by connecting components.  This
+       makes it possible to build more robust edge masks.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       threshold
+	   Set threshold which is used in filtering. If pixel component value
+	   is higher than this value filter algorithm for connecting
+	   components is activated.  By default value is 0.
+
+       The "hysteresis" filter also supports the framesync options.
+
+   iccdetect
+       Detect the colorspace  from an embedded ICC profile (if present), and
+       update the frame's tags accordingly.
+
+       This filter accepts the following options:
+
+       force
+	   If true, the frame's existing colorspace tags will always be
+	   overridden by values detected from an ICC profile. Otherwise, they
+	   will only be assigned if they contain "unknown". Enabled by
+	   default.
+
+   iccgen
+       Generate ICC profiles and attach them to frames.
+
+       This filter accepts the following options:
+
+       color_primaries
+       color_trc
+	   Configure the colorspace that the ICC profile will be generated
+	   for. The default value of "auto" infers the value from the input
+	   frame's metadata, defaulting to BT.709/sRGB as appropriate.
+
+	   See the setparams filter for a list of possible values, but note
+	   that "unknown" are not valid values for this filter.
+
+       force
+	   If true, an ICC profile will be generated even if it would
+	   overwrite an already existing ICC profile. Disabled by default.
+
+   identity
+       Obtain the identity score between two input videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained per component, average, min and max identity score is
+       printed through the logging system.
+
+       The filter stores the calculated identity scores of each frame in frame
+       metadata.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi identity -f null -
+
+   idet
+       Detect video interlacing type.
+
+       This filter tries to detect if the input frames are interlaced,
+       progressive, top or bottom field first. It will also try to detect
+       fields that are repeated between adjacent frames (a sign of telecine).
+
+       Single frame detection considers only immediately adjacent frames when
+       classifying each frame.	Multiple frame detection incorporates the
+       classification history of previous frames.
+
+       The filter will log these metadata values:
+
+       single.current_frame
+	   Detected type of current frame using single-frame detection. One
+	   of: ``tff'' (top field first), ``bff'' (bottom field first),
+	   ``progressive'', or ``undetermined''
+
+       single.tff
+	   Cumulative number of frames detected as top field first using
+	   single-frame detection.
+
+       multiple.tff
+	   Cumulative number of frames detected as top field first using
+	   multiple-frame detection.
+
+       single.bff
+	   Cumulative number of frames detected as bottom field first using
+	   single-frame detection.
+
+       multiple.current_frame
+	   Detected type of current frame using multiple-frame detection. One
+	   of: ``tff'' (top field first), ``bff'' (bottom field first),
+	   ``progressive'', or ``undetermined''
+
+       multiple.bff
+	   Cumulative number of frames detected as bottom field first using
+	   multiple-frame detection.
+
+       single.progressive
+	   Cumulative number of frames detected as progressive using single-
+	   frame detection.
+
+       multiple.progressive
+	   Cumulative number of frames detected as progressive using multiple-
+	   frame detection.
+
+       single.undetermined
+	   Cumulative number of frames that could not be classified using
+	   single-frame detection.
+
+       multiple.undetermined
+	   Cumulative number of frames that could not be classified using
+	   multiple-frame detection.
+
+       repeated.current_frame
+	   Which field in the current frame is repeated from the last. One of
+	   ``neither'', ``top'', or ``bottom''.
+
+       repeated.neither
+	   Cumulative number of frames with no repeated field.
+
+       repeated.top
+	   Cumulative number of frames with the top field repeated from the
+	   previous frame's top field.
+
+       repeated.bottom
+	   Cumulative number of frames with the bottom field repeated from the
+	   previous frame's bottom field.
+
+       The filter accepts the following options:
+
+       intl_thres
+	   Set interlacing threshold.
+
+       prog_thres
+	   Set progressive threshold.
+
+       rep_thres
+	   Threshold for repeated field detection.
+
+       half_life
+	   Number of frames after which a given frame's contribution to the
+	   statistics is halved (i.e., it contributes only 0.5 to its
+	   classification). The default of 0 means that all frames seen are
+	   given full weight of 1.0 forever.
+
+       analyze_interlaced_flag
+	   When this is not 0 then idet will use the specified number of
+	   frames to determine if the interlaced flag is accurate, it will not
+	   count undetermined frames.  If the flag is found to be accurate it
+	   will be used without any further computations, if it is found to be
+	   inaccurate it will be cleared without any further computations.
+	   This allows inserting the idet filter as a low computational method
+	   to clean up the interlaced flag
+
+       Examples
+
+       Inspect the field order of the first 360 frames in a video, in verbose
+       detail:
+
+	       ffmpeg -i INPUT -filter:v idet,metadata=mode=print -frames:v 360 -an -f null -
+
+       The idet filter will add analysis metadata to each frame, which will
+       then be discarded. At the end, the filter will also print a final
+       report with statistics.
+
+   il
+       Deinterleave or interleave fields.
+
+       This filter allows one to process interlaced images fields without
+       deinterlacing them. Deinterleaving splits the input frame into 2 fields
+       (so called half pictures). Odd lines are moved to the top half of the
+       output image, even lines to the bottom half.  You can process (filter)
+       them independently and then re-interleave them.
+
+       The filter accepts the following options:
+
+       luma_mode, l
+       chroma_mode, c
+       alpha_mode, a
+	   Available values for luma_mode, chroma_mode and alpha_mode are:
+
+	   none
+	       Do nothing.
+
+	   deinterleave, d
+	       Deinterleave fields, placing one above the other.
+
+	   interleave, i
+	       Interleave fields. Reverse the effect of deinterleaving.
+
+	   Default value is "none".
+
+       luma_swap, ls
+       chroma_swap, cs
+       alpha_swap, as
+	   Swap luma/chroma/alpha fields. Exchange even & odd lines. Default
+	   value is 0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   inflate
+       Apply inflate effect to the video.
+
+       This filter replaces the pixel by the local(3x3) average by taking into
+       account only values higher than the pixel.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane, default is 65535.  If 0,
+	   plane will remain unchanged.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   interlace
+       Simple interlacing filter from progressive contents. This interleaves
+       upper (or lower) lines from odd frames with lower (or upper) lines from
+       even frames, halving the frame rate and preserving image height.
+
+		  Original	  Original	       New Frame
+		  Frame 'j'	 Frame 'j+1'		 (tff)
+		 ==========	 ===========	   ==================
+		   Line 0  -------------------->    Frame 'j' Line 0
+		   Line 1	   Line 1  ---->   Frame 'j+1' Line 1
+		   Line 2 --------------------->    Frame 'j' Line 2
+		   Line 3	   Line 3  ---->   Frame 'j+1' Line 3
+		    ... 	    ... 		  ...
+	       New Frame + 1 will be generated by Frame 'j+2' and Frame 'j+3' and so on
+
+       It accepts the following optional parameters:
+
+       scan
+	   This determines whether the interlaced frame is taken from the even
+	   (tff - default) or odd (bff) lines of the progressive frame.
+
+       lowpass
+	   Vertical lowpass filter to avoid twitter interlacing and reduce
+	   moire patterns.
+
+	   0, off
+	       Disable vertical lowpass filter
+
+	   1, linear
+	       Enable linear filter (default)
+
+	   2, complex
+	       Enable complex filter. This will slightly less reduce twitter
+	       and moire but better retain detail and subjective sharpness
+	       impression.
+
+   kerndeint
+       Deinterlace input video by applying Donald Graft's adaptive kernel
+       deinterling. Work on interlaced parts of a video to produce progressive
+       frames.
+
+       The description of the accepted parameters follows.
+
+       thresh
+	   Set the threshold which affects the filter's tolerance when
+	   determining if a pixel line must be processed. It must be an
+	   integer in the range [0,255] and defaults to 10. A value of 0 will
+	   result in applying the process on every pixels.
+
+       map Paint pixels exceeding the threshold value to white if set to 1.
+	   Default is 0.
+
+       order
+	   Set the fields order. Swap fields if set to 1, leave fields alone
+	   if 0. Default is 0.
+
+       sharp
+	   Enable additional sharpening if set to 1. Default is 0.
+
+       twoway
+	   Enable twoway sharpening if set to 1. Default is 0.
+
+       Examples
+
+       o   Apply default values:
+
+		   kerndeint=thresh=10:map=0:order=0:sharp=0:twoway=0
+
+       o   Enable additional sharpening:
+
+		   kerndeint=sharp=1
+
+       o   Paint processed pixels in white:
+
+		   kerndeint=map=1
+
+   kirsch
+       Apply kirsch operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lagfun
+       Slowly update darker pixels.
+
+       This filter makes short flashes of light appear longer.	This filter
+       accepts the following options:
+
+       decay
+	   Set factor for decaying. Default is .95. Allowed range is from 0 to
+	   1.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lenscorrection
+       Correct radial lens distortion
+
+       This filter can be used to correct for radial distortion as can result
+       from the use of wide angle lenses, and thereby re-rectify the image. To
+       find the right parameters one can use tools available for example as
+       part of opencv or simply trial-and-error.  To use opencv use the
+       calibration sample (under samples/cpp) from the opencv sources and
+       extract the k1 and k2 coefficients from the resulting matrix.
+
+       Note that effectively the same filter is available in the open-source
+       tools Krita and Digikam from the KDE project.
+
+       In contrast to the vignette filter, which can also be used to
+       compensate lens errors, this filter corrects the distortion of the
+       image, whereas vignette corrects the brightness distribution, so you
+       may want to use both filters together in certain cases, though you will
+       have to take care of ordering, i.e. whether vignetting should be
+       applied before or after lens correction.
+
+       Options
+
+       The filter accepts the following options:
+
+       cx  Relative x-coordinate of the focal point of the image, and thereby
+	   the center of the distortion. This value has a range [0,1] and is
+	   expressed as fractions of the image width. Default is 0.5.
+
+       cy  Relative y-coordinate of the focal point of the image, and thereby
+	   the center of the distortion. This value has a range [0,1] and is
+	   expressed as fractions of the image height. Default is 0.5.
+
+       k1  Coefficient of the quadratic correction term. This value has a
+	   range [-1,1]. 0 means no correction. Default is 0.
+
+       k2  Coefficient of the double quadratic correction term. This value has
+	   a range [-1,1].  0 means no correction. Default is 0.
+
+       i   Set interpolation type. Can be "nearest" or "bilinear".  Default is
+	   "nearest".
+
+       fc  Specify the color of the unmapped pixels. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+	   Default color is "black@0".
+
+       The formula that generates the correction is:
+
+       r_src = r_tgt * (1 + k1 * (r_tgt / r_0)^2 + k2 * (r_tgt / r_0)^4)
+
+       where r_0 is halve of the image diagonal and r_src and r_tgt are the
+       distances from the focal point in the source and target images,
+       respectively.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lensfun
+       Apply lens correction via the lensfun library
+       (<http://lensfun.sourceforge.net/>).
+
+       The "lensfun" filter requires the camera make, camera model, and lens
+       model to apply the lens correction. The filter will load the lensfun
+       database and query it to find the corresponding camera and lens entries
+       in the database. As long as these entries can be found with the given
+       options, the filter can perform corrections on frames. Note that
+       incomplete strings will result in the filter choosing the best match
+       with the given options, and the filter will output the chosen camera
+       and lens models (logged with level "info"). You must provide the make,
+       camera model, and lens model as they are required.
+
+       To obtain a list of available makes and models, leave out one or both
+       of "make" and "model" options. The filter will send the full list to
+       the log with level "INFO".  The first column is the make and the second
+       column is the model.  To obtain a list of available lenses, set any
+       values for make and model and leave out the "lens_model" option. The
+       filter will send the full list of lenses in the log with level "INFO".
+       The ffmpeg tool will exit after the list is printed.
+
+       The filter accepts the following options:
+
+       make
+	   The make of the camera (for example, "Canon"). This option is
+	   required.
+
+       model
+	   The model of the camera (for example, "Canon EOS 100D"). This
+	   option is required.
+
+       lens_model
+	   The model of the lens (for example, "Canon EF-S 18-55mm f/3.5-5.6
+	   IS STM"). This option is required.
+
+       db_path
+	   The full path to the lens database folder. If not set, the filter
+	   will attempt to load the database from the install path when the
+	   library was built. Default is unset.
+
+       mode
+	   The type of correction to apply. The following values are valid
+	   options:
+
+	   vignetting
+	       Enables fixing lens vignetting.
+
+	   geometry
+	       Enables fixing lens geometry. This is the default.
+
+	   subpixel
+	       Enables fixing chromatic aberrations.
+
+	   vig_geo
+	       Enables fixing lens vignetting and lens geometry.
+
+	   vig_subpixel
+	       Enables fixing lens vignetting and chromatic aberrations.
+
+	   distortion
+	       Enables fixing both lens geometry and chromatic aberrations.
+
+	   all Enables all possible corrections.
+
+       focal_length
+	   The focal length of the image/video (zoom; expected constant for
+	   video). For example, a 18--55mm lens has focal length range of
+	   [18--55], so a value in that range should be chosen when using that
+	   lens. Default 18.
+
+       aperture
+	   The aperture of the image/video (expected constant for video). Note
+	   that aperture is only used for vignetting correction. Default 3.5.
+
+       focus_distance
+	   The focus distance of the image/video (expected constant for
+	   video). Note that focus distance is only used for vignetting and
+	   only slightly affects the vignetting correction process. If
+	   unknown, leave it at the default value (which is 1000).
+
+       scale
+	   The scale factor which is applied after transformation. After
+	   correction the video is no longer necessarily rectangular. This
+	   parameter controls how much of the resulting image is visible. The
+	   value 0 means that a value will be chosen automatically such that
+	   there is little or no unmapped area in the output image. 1.0 means
+	   that no additional scaling is done. Lower values may result in more
+	   of the corrected image being visible, while higher values may avoid
+	   unmapped areas in the output.
+
+       target_geometry
+	   The target geometry of the output image/video. The following values
+	   are valid options:
+
+	   rectilinear (default)
+	   fisheye
+	   panoramic
+	   equirectangular
+	   fisheye_orthographic
+	   fisheye_stereographic
+	   fisheye_equisolid
+	   fisheye_thoby
+       reverse
+	   Apply the reverse of image correction (instead of correcting
+	   distortion, apply it).
+
+       interpolation
+	   The type of interpolation used when correcting distortion. The
+	   following values are valid options:
+
+	   nearest
+	   linear (default)
+	   lanczos
+
+       Examples
+
+       o   Apply lens correction with make "Canon", camera model "Canon EOS
+	   100D", and lens model "Canon EF-S 18-55mm f/3.5-5.6 IS STM" with
+	   focal length of "18" and aperture of "8.0".
+
+		   ffmpeg -i input.mov -vf lensfun=make=Canon:model="Canon EOS 100D":lens_model="Canon EF-S 18-55mm f/3.5-5.6 IS STM":focal_length=18:aperture=8 -c:v h264 -b:v 8000k output.mov
+
+       o   Apply the same as before, but only for the first 5 seconds of
+	   video.
+
+		   ffmpeg -i input.mov -vf lensfun=make=Canon:model="Canon EOS 100D":lens_model="Canon EF-S 18-55mm f/3.5-5.6 IS STM":focal_length=18:aperture=8:enable='lte(t\,5)' -c:v h264 -b:v 8000k output.mov
+
+   libplacebo
+       Flexible GPU-accelerated processing filter based on libplacebo
+       (<https://code.videolan.org/videolan/libplacebo>).
+
+       Options
+
+       The options for this filter are divided into the following sections:
+
+       Output mode
+
+       These options control the overall output mode. By default, libplacebo
+       will try to preserve the source colorimetry and size as best as it can,
+       but it will apply any embedded film grain, dolby vision metadata or
+       anamorphic SAR present in source frames.
+
+       inputs
+	   Set the number of inputs. This can be used, alongside the "idx"
+	   variable, to allow placing/blending multiple inputs inside the
+	   output frame. This effectively enables functionality similar to
+	   hstack, overlay, etc.
+
+       w
+       h   Set the output video dimension expression. Default values are "iw"
+	   and "ih".
+
+	   Allows for the same expressions as the scale filter.
+
+       crop_x
+       crop_y
+	   Set the input crop x/y expressions, default values are "(iw-cw)/2"
+	   and "(ih-ch)/2".
+
+       crop_w
+       crop_h
+	   Set the input crop width/height expressions, default values are
+	   "iw" and "ih".
+
+       pos_x
+       pos_y
+	   Set the output placement x/y expressions, default values are
+	   "(ow-pw)/2" and "(oh-ph)/2".
+
+       pos_w
+       pos_h
+	   Set the output placement width/height expressions, default values
+	   are "ow" and "oh".
+
+       fps Set the output frame rate. This can be rational, e.g. "60000/1001".
+	   If set to the special string "none" (the default), input timestamps
+	   will instead be passed through to the output unmodified. Otherwise,
+	   the input video frames will be interpolated as necessary to rescale
+	   the video to the specified target framerate, in a manner as
+	   determined by the frame_mixer option.
+
+       format
+	   Set the output format override. If unset (the default), frames will
+	   be output in the same format as the respective input frames.
+	   Otherwise, format conversion will be performed.
+
+       force_original_aspect_ratio
+       force_divisible_by
+	   Work the same as the identical scale filter options.
+
+       normalize_sar
+	   If enabled, output frames will always have a pixel aspect ratio of
+	   1:1. This will introduce additional padding/cropping as necessary.
+	   If disabled (the default), any aspect ratio mismatches, including
+	   those from e.g. anamorphic video sources, are forwarded to the
+	   output pixel aspect ratio.
+
+       pad_crop_ratio
+	   Specifies a ratio (between 0.0 and 1.0) between padding and
+	   cropping when the input aspect ratio does not match the output
+	   aspect ratio and normalize_sar is in effect. The default of 0.0
+	   always pads the content with black borders, while a value of 1.0
+	   always crops off parts of the content. Intermediate values are
+	   possible, leading to a mix of the two approaches.
+
+       fillcolor
+	   Set the color used to fill the output area not covered by the
+	   output image, for example as a result of normalize_sar. For the
+	   general syntax of this option, check the "Color" section in the
+	   ffmpeg-utils manual. Defaults to "black".
+
+       corner_rounding
+	   Render frames with rounded corners. The value, given as a float
+	   ranging from 0.0 to 1.0, indicates the relative degree of rounding,
+	   from fully square to fully circular. In other words, it gives the
+	   radius divided by half the smaller side length. Defaults to 0.0.
+
+       extra_opts
+	   Pass extra libplacebo internal configuration options. These can be
+	   specified as a list of key=value pairs separated by ':'. The
+	   following example shows how to configure a custom filter kernel
+	   ("EWA LanczosSharp") and use it to double the input image
+	   resolution:
+
+		   -vf "libplacebo=w=iw*2:h=ih*2:extra_opts='upscaler=custom\:upscaler_preset=ewa_lanczos\:upscaler_blur=0.9812505644269356'"
+
+       colorspace
+       color_primaries
+       color_trc
+       range
+	   Configure the colorspace that output frames will be delivered in.
+	   The default value of "auto" outputs frames in the same format as
+	   the input frames, leading to no change. For any other value,
+	   conversion will be performed.
+
+	   See the setparams filter for a list of possible values.
+
+       apply_filmgrain
+	   Apply film grain (e.g. AV1 or H.274) if present in source frames,
+	   and strip it from the output. Enabled by default.
+
+       apply_dolbyvision
+	   Apply Dolby Vision RPU metadata if present in source frames, and
+	   strip it from the output. Enabled by default. Note that Dolby
+	   Vision will always output BT.2020+PQ, overriding the usual input
+	   frame metadata. These will also be picked as the values of "auto"
+	   for the respective frame output options.
+
+       In addition to the expression constants documented for the scale
+       filter, the crop_w, crop_h, crop_x, crop_y, pos_w, pos_h, pos_x and
+       pos_y options can also contain the following constants:
+
+       in_idx, idx
+	   The (0-based) numeric index of the currently active input stream.
+
+       crop_w, cw
+       crop_h, ch
+	   The computed values of crop_w and crop_h.
+
+       pos_w, pw
+       pos_h, ph
+	   The computed values of pos_w and pos_h.
+
+       in_t, t
+	   The input frame timestamp, in seconds. NAN if input timestamp is
+	   unknown.
+
+       out_t, ot
+	   The input frame timestamp, in seconds. NAN if input timestamp is
+	   unknown.
+
+       n   The input frame number, starting with 0.
+
+       Scaling
+
+       The options in this section control how libplacebo performs upscaling
+       and (if necessary) downscaling. Note that libplacebo will always
+       internally operate on 4:4:4 content, so any sub-sampled chroma formats
+       such as "yuv420p" will necessarily be upsampled and downsampled as part
+       of the rendering process. That means scaling might be in effect even if
+       the source and destination resolution are the same.
+
+       upscaler
+       downscaler
+	   Configure the filter kernel used for upscaling and downscaling. The
+	   respective defaults are "spline36" and "mitchell". For a full list
+	   of possible values, pass "help" to these options. The most
+	   important values are:
+
+	   none
+	       Forces the use of built-in GPU texture sampling (typically
+	       bilinear). Extremely fast but poor quality, especially when
+	       downscaling.
+
+	   bilinear
+	       Bilinear interpolation. Can generally be done for free on GPUs,
+	       except when doing so would lead to aliasing. Fast and low
+	       quality.
+
+	   nearest
+	       Nearest-neighbour interpolation. Sharp but highly aliasing.
+
+	   oversample
+	       Algorithm that looks visually similar to nearest-neighbour
+	       interpolation but tries to preserve pixel aspect ratio. Good
+	       for pixel art, since it results in minimal distortion of the
+	       artistic appearance.
+
+	   lanczos
+	       Standard sinc-sinc interpolation kernel.
+
+	   spline36
+	       Cubic spline approximation of lanczos. No difference in
+	       performance, but has very slightly less ringing.
+
+	   ewa_lanczos
+	       Elliptically weighted average version of lanczos, based on a
+	       jinc-sinc kernel.  This is also popularly referred to as just
+	       "Jinc scaling". Slow but very high quality.
+
+	   gaussian
+	       Gaussian kernel. Has certain ideal mathematical properties, but
+	       subjectively very blurry.
+
+	   mitchell
+	       Cubic BC spline with parameters recommended by Mitchell and
+	       Netravali. Very little ringing.
+
+       frame_mixer
+	   Controls the kernel used for mixing frames temporally. The default
+	   value is "none", which disables frame mixing. For a full list of
+	   possible values, pass "help" to this option. The most important
+	   values are:
+
+	   none
+	       Disables frame mixing, giving a result equivalent to "nearest
+	       neighbour" semantics.
+
+	   oversample
+	       Oversamples the input video to create a "Smooth Motion"-type
+	       effect: if an output frame would exactly fall on the transition
+	       between two video frames, it is blended according to the
+	       relative overlap. This is the recommended option whenever
+	       preserving the original subjective appearance is desired.
+
+	   mitchell_clamp
+	       Larger filter kernel that smoothly interpolates multiple frames
+	       in a manner designed to eliminate ringing and other artefacts
+	       as much as possible. This is the recommended option wherever
+	       maximum visual smoothness is desired.
+
+	   linear
+	       Linear blend/fade between frames. Especially useful for
+	       constructing e.g.  slideshows.
+
+       lut_entries
+	   Configures the size of scaler LUTs, ranging from 1 to 256. The
+	   default of 0 will pick libplacebo's internal default, typically 64.
+
+       antiringing
+	   Enables anti-ringing (for non-EWA filters). The value (between 0.0
+	   and 1.0) configures the strength of the anti-ringing algorithm. May
+	   increase aliasing if set too high. Disabled by default.
+
+       sigmoid
+	   Enable sigmoidal compression during upscaling. Reduces ringing
+	   slightly.  Enabled by default.
+
+       Debanding
+
+       Libplacebo comes with a built-in debanding filter that is good at
+       counteracting many common sources of banding and blocking. Turning this
+       on is highly recommended whenever quality is desired.
+
+       deband
+	   Enable (fast) debanding algorithm. Disabled by default.
+
+       deband_iterations
+	   Number of deband iterations of the debanding algorithm. Each
+	   iteration is performed with progressively increased radius (and
+	   diminished threshold).  Recommended values are in the range 1 to 4.
+	   Defaults to 1.
+
+       deband_threshold
+	   Debanding filter strength. Higher numbers lead to more aggressive
+	   debanding.  Defaults to 4.0.
+
+       deband_radius
+	   Debanding filter radius. A higher radius is better for slow
+	   gradients, while a lower radius is better for steep gradients.
+	   Defaults to 16.0.
+
+       deband_grain
+	   Amount of extra output grain to add. Helps hide imperfections.
+	   Defaults to 6.0.
+
+       Color adjustment
+
+       A collection of subjective color controls. Not very rigorous, so the
+       exact effect will vary somewhat depending on the input primaries and
+       colorspace.
+
+       brightness
+	   Brightness boost, between "-1.0" and 1.0. Defaults to 0.0.
+
+       contrast
+	   Contrast gain, between 0.0 and 16.0. Defaults to 1.0.
+
+       saturation
+	   Saturation gain, between 0.0 and 16.0. Defaults to 1.0.
+
+       hue Hue shift in radians, between "-3.14" and 3.14. Defaults to 0.0.
+	   This will rotate the UV subvector, defaulting to BT.709
+	   coefficients for RGB inputs.
+
+       gamma
+	   Gamma adjustment, between 0.0 and 16.0. Defaults to 1.0.
+
+       cones
+	   Cone model to use for color blindness simulation. Accepts any
+	   combination of "l", "m" and "s". Here are some examples:
+
+	   m   Deuteranomaly / deuteranopia (affecting 3%-4% of the
+	       population)
+
+	   l   Protanomaly / protanopia (affecting 1%-2% of the population)
+
+	   l+m Monochromacy (very rare)
+
+	   l+m+s
+	       Achromatopsy (complete loss of daytime vision, extremely rare)
+
+       cone-strength
+	   Gain factor for the cones specified by "cones", between 0.0 and
+	   10.0. A value of 1.0 results in no change to color vision. A value
+	   of 0.0 (the default) simulates complete loss of those cones. Values
+	   above 1.0 result in exaggerating the differences between cones,
+	   which may help compensate for reduced color vision.
+
+       Peak detection
+
+       To help deal with sources that only have static HDR10 metadata (or no
+       tagging whatsoever), libplacebo uses its own internal frame analysis
+       compute shader to analyze source frames and adapt the tone mapping
+       function in realtime. If this is too slow, or if exactly reproducible
+       frame-perfect results are needed, it's recommended to turn this feature
+       off.
+
+       peak_detect
+	   Enable HDR peak detection. Ignores static MaxCLL/MaxFALL values in
+	   favor of dynamic detection from the input. Note that the detected
+	   values do not get written back to the output frames, they merely
+	   guide the internal tone mapping process. Enabled by default.
+
+       smoothing_period
+	   Peak detection smoothing period, between 0.0 and 1000.0. Higher
+	   values result in peak detection becoming less responsive to changes
+	   in the input. Defaults to 100.0.
+
+       minimum_peak
+	   Lower bound on the detected peak (relative to SDR white), between
+	   0.0 and 100.0. Defaults to 1.0.
+
+       scene_threshold_low
+       scene_threshold_high
+	   Lower and upper thresholds for scene change detection. Expressed in
+	   a logarithmic scale between 0.0 and 100.0. Default to 5.5 and 10.0,
+	   respectively. Setting either to a negative value disables this
+	   functionality.
+
+       percentile
+	   Which percentile of the frame brightness histogram to use as the
+	   source peak for tone-mapping. Defaults to 99.995, a fairly
+	   conservative value.	Setting this to 100.0 disables frame histogram
+	   measurement and instead uses the true peak brightness for tone-
+	   mapping.
+
+       Tone mapping
+
+       The options in this section control how libplacebo performs tone-
+       mapping and gamut-mapping when dealing with mismatches between wide-
+       gamut or HDR content.  In general, libplacebo relies on accurate source
+       tagging and mastering display gamut information to produce the best
+       results.
+
+       gamut_mode
+	   How to handle out-of-gamut colors that can occur as a result of
+	   colorimetric gamut mapping.
+
+	   clip
+	       Do nothing, simply clip out-of-range colors to the RGB volume.
+	       Low quality but extremely fast.
+
+	   perceptual
+	       Perceptually soft-clip colors to the gamut volume. This is the
+	       default.
+
+	   relative
+	       Relative colorimetric hard-clip. Similar to "perceptual" but
+	       without the soft knee.
+
+	   saturation
+	       Saturation mapping, maps primaries directly to primaries in RGB
+	       space.  Not recommended except for artificial computer graphics
+	       for which a bright, saturated display is desired.
+
+	   absolute
+	       Absolute colorimetric hard-clip. Performs no adjustment of the
+	       white point.
+
+	   desaturate
+	       Hard-desaturates out-of-gamut colors towards white, while
+	       preserving the luminance. Has a tendency to distort the visual
+	       appearance of bright objects.
+
+	   darken
+	       Linearly reduces content brightness to preserves saturated
+	       details, followed by clipping the remaining out-of-gamut
+	       colors.
+
+	   warn
+	       Highlight out-of-gamut pixels (by inverting/marking them).
+
+	   linear
+	       Linearly reduces chromaticity of the entire image to make it
+	       fit within the target color volume. Be careful when using this
+	       on BT.2020 sources without proper mastering metadata, as doing
+	       so will lead to excessive desaturation.
+
+       tonemapping
+	   Tone-mapping algorithm to use. Available values are:
+
+	   auto
+	       Automatic selection based on internal heuristics. This is the
+	       default.
+
+	   clip
+	       Performs no tone-mapping, just clips out-of-range colors.
+	       Retains perfect color accuracy for in-range colors but
+	       completely destroys out-of-range information.  Does not perform
+	       any black point adaptation. Not configurable.
+
+	   st2094-40
+	       EETF from SMPTE ST 2094-40 Annex B, which applies the Bezier
+	       curves from HDR10+ dynamic metadata based on Bezier curves to
+	       perform tone-mapping. The OOTF used is adjusted based on the
+	       ratio between the targeted and actual display peak luminances.
+
+	   st2094-10
+	       EETF from SMPTE ST 2094-10 Annex B.2, which takes into account
+	       the input signal average luminance in addition to the
+	       maximum/minimum. The configurable contrast parameter influences
+	       the slope of the linear output segment, defaulting to 1.0 for
+	       no increase/decrease in contrast. Note that this does not
+	       currently include the subjective gain/offset/gamma controls
+	       defined in Annex B.3.
+
+	   bt.2390
+	       EETF from the ITU-R Report BT.2390, a hermite spline roll-off
+	       with linear segment. The knee point offset is configurable.
+	       Note that this parameter defaults to 1.0, rather than the value
+	       of 0.5 from the ITU-R spec.
+
+	   bt.2446a
+	       EETF from ITU-R Report BT.2446, method A. Designed for well-
+	       mastered HDR sources. Can be used for both forward and inverse
+	       tone mapping. Not configurable.
+
+	   spline
+	       Simple spline consisting of two polynomials, joined by a single
+	       pivot point.  The parameter gives the pivot point (in PQ
+	       space), defaulting to 0.30.  Can be used for both forward and
+	       inverse tone mapping.
+
+	   reinhard
+	       Simple non-linear, global tone mapping algorithm. The parameter
+	       specifies the local contrast coefficient at the display peak.
+	       Essentially, a parameter of 0.5 implies that the reference
+	       white will be about half as bright as when clipping. Defaults
+	       to 0.5, which results in the simplest formulation of this
+	       function.
+
+	   mobius
+	       Generalization of the reinhard tone mapping algorithm to
+	       support an additional linear slope near black. The tone mapping
+	       parameter indicates the trade-off between the linear section
+	       and the non-linear section. Essentially, for a given parameter
+	       x, every color value below x will be mapped linearly, while
+	       higher values get non-linearly tone-mapped. Values near 1.0
+	       make this curve behave like "clip", while values near 0.0 make
+	       this curve behave like "reinhard". The default value is 0.3,
+	       which provides a good balance between colorimetric accuracy and
+	       preserving out-of-gamut details.
+
+	   hable
+	       Piece-wise, filmic tone-mapping algorithm developed by John
+	       Hable for use in Uncharted 2, inspired by a similar tone-
+	       mapping algorithm used by Kodak.  Popularized by its use in
+	       video games with HDR rendering. Preserves both dark and bright
+	       details very well, but comes with the drawback of changing the
+	       average brightness quite significantly. This is sort of similar
+	       to "reinhard" with parameter 0.24.
+
+	   gamma
+	       Fits a gamma (power) function to transfer between the source
+	       and target color spaces, effectively resulting in a perceptual
+	       hard-knee joining two roughly linear sections. This preserves
+	       details at all scales fairly accurately, but can result in an
+	       image with a muted or dull appearance. The parameter is used as
+	       the cutoff point, defaulting to 0.5.
+
+	   linear
+	       Linearly stretches the input range to the output range, in PQ
+	       space. This will preserve all details accurately, but results
+	       in a significantly different average brightness. Can be used
+	       for inverse tone-mapping in addition to regular tone-mapping.
+	       The parameter can be used as an additional linear gain
+	       coefficient (defaulting to 1.0).
+
+       tonemapping_param
+	   For tunable tone mapping functions, this parameter can be used to
+	   fine-tune the curve behavior. Refer to the documentation of
+	   "tonemapping". The default value of 0.0 is replaced by the curve's
+	   preferred default setting.
+
+       inverse_tonemapping
+	   If enabled, this filter will also attempt stretching SDR signals to
+	   fill HDR output color volumes. Disabled by default.
+
+       tonemapping_lut_size
+	   Size of the tone-mapping LUT, between 2 and 1024. Defaults to 256.
+	   Note that this figure is squared when combined with "peak_detect".
+
+       contrast_recovery
+	   Contrast recovery strength. If set to a value above 0.0, the source
+	   image will be divided into high-frequency and low-frequency
+	   components, and a portion of the high-frequency image is added back
+	   onto the tone-mapped output.  May cause excessive ringing artifacts
+	   for some HDR sources, but can improve the subjective sharpness and
+	   detail left over in the image after tone-mapping.  Defaults to
+	   0.30.
+
+       contrast_smoothness
+	   Contrast recovery lowpass kernel size. Defaults to 3.5. Increasing
+	   or decreasing this will affect the visual appearance substantially.
+	   Has no effect when "contrast_recovery" is disabled.
+
+       Dithering
+
+       By default, libplacebo will dither whenever necessary, which includes
+       rendering to any integer format below 16-bit precision. It's
+       recommended to always leave this on, since not doing so may result in
+       visible banding in the output, even if the "debanding" filter is
+       enabled. If maximum performance is needed, use "ordered_fixed" instead
+       of disabling dithering.
+
+       dithering
+	   Dithering method to use. Accepts the following values:
+
+	   none
+	       Disables dithering completely. May result in visible banding.
+
+	   blue
+	       Dither with pseudo-blue noise. This is the default.
+
+	   ordered
+	       Tunable ordered dither pattern.
+
+	   ordered_fixed
+	       Faster ordered dither with a fixed size of 6. Texture-less.
+
+	   white
+	       Dither with white noise. Texture-less.
+
+       dither_lut_size
+	   Dither LUT size, as log base2 between 1 and 8. Defaults to 6,
+	   corresponding to a LUT size of "64x64".
+
+       dither_temporal
+	   Enables temporal dithering. Disabled by default.
+
+       Custom shaders
+
+       libplacebo supports a number of custom shaders based on the mpv .hook
+       GLSL syntax. A collection of such shaders can be found here:
+       <https://github.com/mpv-player/mpv/wiki/User-Scripts#user-shaders>
+
+       A full description of the mpv shader format is beyond the scope of this
+       section, but a summary can be found here:
+       <https://mpv.io/manual/master/#options-glsl-shader>
+
+       custom_shader_path
+	   Specifies a path to a custom shader file to load at runtime.
+
+       custom_shader_bin
+	   Specifies a complete custom shader as a raw string.
+
+       Debugging / performance
+
+       All of the options in this section default off. They may be of
+       assistance when attempting to squeeze the maximum performance at the
+       cost of quality.
+
+       skip_aa
+	   Disable anti-aliasing when downscaling.
+
+       polar_cutoff
+	   Truncate polar (EWA) scaler kernels below this absolute magnitude,
+	   between 0.0 and 1.0.
+
+       disable_linear
+	   Disable linear light scaling.
+
+       disable_builtin
+	   Disable built-in GPU sampling (forces LUT).
+
+       disable_fbos
+	   Forcibly disable FBOs, resulting in loss of almost all
+	   functionality, but offering the maximum possible speed.
+
+       Commands
+
+       This filter supports almost all of the above options as commands.
+
+       Examples
+
+       o   Tone-map input to standard gamut BT.709 output:
+
+		   libplacebo=colorspace=bt709:color_primaries=bt709:color_trc=bt709:range=tv
+
+       o   Rescale input to fit into standard 1080p, with high quality
+	   scaling:
+
+		   libplacebo=w=1920:h=1080:force_original_aspect_ratio=decrease:normalize_sar=true:upscaler=ewa_lanczos:downscaler=ewa_lanczos
+
+       o   Interpolate low FPS / VFR input to smoothed constant 60 fps output:
+
+		   libplacebo=fps=60:frame_mixer=mitchell_clamp
+
+       o   Convert input to standard sRGB JPEG:
+
+		   libplacebo=format=yuv420p:colorspace=bt470bg:color_primaries=bt709:color_trc=iec61966-2-1:range=pc
+
+       o   Use higher quality debanding settings:
+
+		   libplacebo=deband=true:deband_iterations=3:deband_radius=8:deband_threshold=6
+
+       o   Run this filter on the CPU, on systems with Mesa installed (and
+	   with the most expensive options disabled):
+
+		   ffmpeg ... -init_hw_device vulkan:llvmpipe ... -vf libplacebo=upscaler=none:downscaler=none:peak_detect=false
+
+       o   Suppress CPU-based AV1/H.274 film grain application in the decoder,
+	   in favor of doing it with this filter. Note that this is only a
+	   gain if the frames are either already on the GPU, or if you're
+	   using libplacebo for other purposes, since otherwise the VRAM
+	   roundtrip will more than offset any expected speedup.
+
+		   ffmpeg -export_side_data +film_grain ... -vf libplacebo=apply_filmgrain=true
+
+       o   Interop with VAAPI hwdec to avoid round-tripping through RAM:
+
+		   ffmpeg -init_hw_device vulkan -hwaccel vaapi -hwaccel_output_format vaapi ... -vf libplacebo
+
+   libvmaf
+       Calculate the VMAF (Video Multi-Method Assessment Fusion) score for a
+       reference/distorted pair of input videos.
+
+       The first input is the distorted video, and the second input is the
+       reference video.
+
+       The obtained VMAF score is printed through the logging system.
+
+       It requires Netflix's vmaf library (libvmaf) as a pre-requisite.  After
+       installing the library it can be enabled using: "./configure
+       --enable-libvmaf".
+
+       The filter has following options:
+
+       model
+	   A `|` delimited list of vmaf models. Each model can be configured
+	   with a number of parameters.  Default value: "version=vmaf_v0.6.1"
+
+       feature
+	   A `|` delimited list of features. Each feature can be configured
+	   with a number of parameters.
+
+       log_path
+	   Set the file path to be used to store log files.
+
+       log_fmt
+	   Set the format of the log file (xml, json, csv, or sub).
+
+       pool
+	   Set the pool method to be used for computing vmaf.  Options are
+	   "min", "harmonic_mean" or "mean" (default).
+
+       n_threads
+	   Set number of threads to be used when initializing libvmaf.
+	   Default value: 0, no threads.
+
+       n_subsample
+	   Set frame subsampling interval to be used.
+
+       This filter also supports the framesync options.
+
+       Examples
+
+       o   In the examples below, a distorted video distorted.mpg is compared
+	   with a reference file reference.mpg.
+
+       o   Basic usage:
+
+		   ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf=log_path=output.xml -f null -
+
+       o   Example with multiple models:
+
+		   ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf='model=version=vmaf_v0.6.1\\:name=vmaf|version=vmaf_v0.6.1neg\\:name=vmaf_neg' -f null -
+
+       o   Example with multiple additional features:
+
+		   ffmpeg -i distorted.mpg -i reference.mpg -lavfi libvmaf='feature=name=psnr|name=ciede' -f null -
+
+       o   Example with options and different containers:
+
+		   ffmpeg -i distorted.mpg -i reference.mkv -lavfi "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]libvmaf=log_fmt=json:log_path=output.json" -f null -
+
+   libvmaf_cuda
+       This is the CUDA variant of the libvmaf filter. It only accepts CUDA
+       frames.
+
+       It requires Netflix's vmaf library (libvmaf) as a pre-requisite.  After
+       installing the library it can be enabled using: "./configure
+       --enable-nonfree --enable-ffnvcodec --enable-libvmaf".
+
+       Examples
+
+       o   Basic usage showing CUVID hardware decoding and CUDA scaling with
+	   scale_cuda:
+
+		   ffmpeg \
+		       -hwaccel cuda -hwaccel_output_format cuda -codec:v av1_cuvid -i dis.obu \
+		       -hwaccel cuda -hwaccel_output_format cuda -codec:v av1_cuvid -i ref.obu \
+		       -filter_complex "
+			   [0:v]scale_cuda=format=yuv420p[ref]; \
+			   [1:v]scale_cuda=format=yuv420p[dis]; \
+			   [dis][ref]libvmaf_cuda=log_fmt=json:log_path=output.json
+		       " \
+		       -f null -
+
+   limitdiff
+       Apply limited difference filter using second and optionally third video
+       stream.
+
+       The filter accepts the following options:
+
+       threshold
+	   Set the threshold to use when allowing certain differences between
+	   video streams.  Any absolute difference value lower or exact than
+	   this threshold will pick pixel components from first video stream.
+
+       elasticity
+	   Set the elasticity of soft thresholding when processing video
+	   streams.  This value multiplied with first one sets second
+	   threshold.  Any absolute difference value greater or exact than
+	   second threshold will pick pixel components from second video
+	   stream. For values between those two threshold linear interpolation
+	   between first and second video stream will be used.
+
+       reference
+	   Enable the reference (third) video stream processing. By default is
+	   disabled.  If set, this video stream will be used for calculating
+	   absolute difference with first video stream.
+
+       planes
+	   Specify which planes will be processed. Defaults to all available.
+
+       Commands
+
+       This filter supports the all above options as commands except option
+       reference.
+
+   limiter
+       Limits the pixel components values to the specified range [min, max].
+
+       The filter accepts the following options:
+
+       min Lower bound. Defaults to the lowest allowed value for the input.
+
+       max Upper bound. Defaults to the highest allowed value for the input.
+
+       planes
+	   Specify which planes will be processed. Defaults to all available.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   loop
+       Loop video frames.
+
+       The filter accepts the following options:
+
+       loop
+	   Set the number of loops. Setting this value to -1 will result in
+	   infinite loops.  Default is 0.
+
+       size
+	   Set maximal size in number of frames. Default is 0.
+
+       start
+	   Set first frame of loop. Default is 0.
+
+       time
+	   Set the time of loop start in seconds.  Only used if option named
+	   start is set to "-1".
+
+       Examples
+
+       o   Loop single first frame infinitely:
+
+		   loop=loop=-1:size=1:start=0
+
+       o   Loop single first frame 10 times:
+
+		   loop=loop=10:size=1:start=0
+
+       o   Loop 10 first frames 5 times:
+
+		   loop=loop=5:size=10:start=0
+
+   lut1d
+       Apply a 1D LUT to an input video.
+
+       The filter accepts the following options:
+
+       file
+	   Set the 1D LUT file name.
+
+	   Currently supported formats:
+
+	   cube
+	       Iridas
+
+	   csp cineSpace
+
+       interp
+	   Select interpolation mode.
+
+	   Available values are:
+
+	   nearest
+	       Use values from the nearest defined point.
+
+	   linear
+	       Interpolate values using the linear interpolation.
+
+	   cosine
+	       Interpolate values using the cosine interpolation.
+
+	   cubic
+	       Interpolate values using the cubic interpolation.
+
+	   spline
+	       Interpolate values using the spline interpolation.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   lut3d
+       Apply a 3D LUT to an input video.
+
+       The filter accepts the following options:
+
+       file
+	   Set the 3D LUT file name.
+
+	   Currently supported formats:
+
+	   3dl AfterEffects
+
+	   cube
+	       Iridas
+
+	   dat DaVinci
+
+	   m3d Pandora
+
+	   csp cineSpace
+
+       interp
+	   Select interpolation mode.
+
+	   Available values are:
+
+	   nearest
+	       Use values from the nearest defined point.
+
+	   trilinear
+	       Interpolate values using the 8 points defining a cube.
+
+	   tetrahedral
+	       Interpolate values using a tetrahedron.
+
+	   pyramid
+	       Interpolate values using a pyramid.
+
+	   prism
+	       Interpolate values using a prism.
+
+       Commands
+
+       This filter supports the "interp" option as commands.
+
+   lumakey
+       Turn certain luma values into transparency.
+
+       The filter accepts the following options:
+
+       threshold
+	   Set the luma which will be used as base for transparency.  Default
+	   value is 0.
+
+       tolerance
+	   Set the range of luma values to be keyed out.  Default value is
+	   0.01.
+
+       softness
+	   Set the range of softness. Default value is 0.  Use this to control
+	   gradual transition from zero to full transparency.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   lut, lutrgb, lutyuv
+       Compute a look-up table for binding each pixel component input value to
+       an output value, and apply it to the input video.
+
+       lutyuv applies a lookup table to a YUV input video, lutrgb to an RGB
+       input video.
+
+       These filters accept the following parameters:
+
+       c0  set first pixel component expression
+
+       c1  set second pixel component expression
+
+       c2  set third pixel component expression
+
+       c3  set fourth pixel component expression, corresponds to the alpha
+	   component
+
+       r   set red component expression
+
+       g   set green component expression
+
+       b   set blue component expression
+
+       a   alpha component expression
+
+       y   set Y/luma component expression
+
+       u   set U/Cb component expression
+
+       v   set V/Cr component expression
+
+       Each of them specifies the expression to use for computing the lookup
+       table for the corresponding pixel component values.
+
+       The exact component associated to each of the c* options depends on the
+       format in input.
+
+       The lut filter requires either YUV or RGB pixel formats in input,
+       lutrgb requires RGB pixel formats in input, and lutyuv requires YUV.
+
+       The expressions can contain the following constants and functions:
+
+       w
+       h   The input width and height.
+
+       val The input value for the pixel component.
+
+       clipval
+	   The input value, clipped to the minval-maxval range.
+
+       maxval
+	   The maximum value for the pixel component.
+
+       minval
+	   The minimum value for the pixel component.
+
+       negval
+	   The negated value for the pixel component value, clipped to the
+	   minval-maxval range; it corresponds to the expression
+	   "maxval-clipval+minval".
+
+       clip(val)
+	   The computed value in val, clipped to the minval-maxval range.
+
+       gammaval(gamma)
+	   The computed gamma correction value of the pixel component value,
+	   clipped to the minval-maxval range. It corresponds to the
+	   expression
+	   "pow((clipval-minval)/(maxval-minval)\,gamma)*(maxval-minval)+minval"
+
+       All expressions default to "clipval".
+
+       Commands
+
+       This filter supports same commands as options.
+
+       Examples
+
+       o   Negate input video:
+
+		   lutrgb="r=maxval+minval-val:g=maxval+minval-val:b=maxval+minval-val"
+		   lutyuv="y=maxval+minval-val:u=maxval+minval-val:v=maxval+minval-val"
+
+	   The above is the same as:
+
+		   lutrgb="r=negval:g=negval:b=negval"
+		   lutyuv="y=negval:u=negval:v=negval"
+
+       o   Negate luma:
+
+		   lutyuv=y=negval
+
+       o   Remove chroma components, turning the video into a graytone image:
+
+		   lutyuv="u=128:v=128"
+
+       o   Apply a luma burning effect:
+
+		   lutyuv="y=2*val"
+
+       o   Remove green and blue components:
+
+		   lutrgb="g=0:b=0"
+
+       o   Set a constant alpha channel value on input:
+
+		   format=rgba,lutrgb=a="maxval-minval/2"
+
+       o   Correct luma gamma by a factor of 0.5:
+
+		   lutyuv=y=gammaval(0.5)
+
+       o   Discard least significant bits of luma:
+
+		   lutyuv=y='bitand(val, 128+64+32)'
+
+       o   Technicolor like effect:
+
+		   lutyuv=u='(val-maxval/2)*2+maxval/2':v='(val-maxval/2)*2+maxval/2'
+
+   lut2, tlut2
+       The "lut2" filter takes two input streams and outputs one stream.
+
+       The "tlut2" (time lut2) filter takes two consecutive frames from one
+       single stream.
+
+       This filter accepts the following parameters:
+
+       c0  set first pixel component expression
+
+       c1  set second pixel component expression
+
+       c2  set third pixel component expression
+
+       c3  set fourth pixel component expression, corresponds to the alpha
+	   component
+
+       d   set output bit depth, only available for "lut2" filter. By default
+	   is 0, which means bit depth is automatically picked from first
+	   input format.
+
+       The "lut2" filter also supports the framesync options.
+
+       Each of them specifies the expression to use for computing the lookup
+       table for the corresponding pixel component values.
+
+       The exact component associated to each of the c* options depends on the
+       format in inputs.
+
+       The expressions can contain the following constants:
+
+       w
+       h   The input width and height.
+
+       x   The first input value for the pixel component.
+
+       y   The second input value for the pixel component.
+
+       bdx The first input video bit depth.
+
+       bdy The second input video bit depth.
+
+       All expressions default to "x".
+
+       Commands
+
+       This filter supports the all above options as commands except option
+       "d".
+
+       Examples
+
+       o   Highlight differences between two RGB video streams:
+
+		   lut2='ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,0,pow(2,bdx)-1)'
+
+       o   Highlight differences between two YUV video streams:
+
+		   lut2='ifnot(x-y,0,pow(2,bdx)-1):ifnot(x-y,pow(2,bdx-1),pow(2,bdx)-1):ifnot(x-y,pow(2,bdx-1),pow(2,bdx)-1)'
+
+       o   Show max difference between two video streams:
+
+		   lut2='if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1))):if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1))):if(lt(x,y),0,if(gt(x,y),pow(2,bdx)-1,pow(2,bdx-1)))'
+
+   maskedclamp
+       Clamp the first input stream with the second input and third input
+       stream.
+
+       Returns the value of first stream to be between second input stream -
+       "undershoot" and third input stream + "overshoot".
+
+       This filter accepts the following options:
+
+       undershoot
+	   Default value is 0.
+
+       overshoot
+	   Default value is 0.
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedmax
+       Merge the second and third input stream into output stream using
+       absolute differences between second input stream and first input stream
+       and absolute difference between third input stream and first input
+       stream. The picked value will be from second input stream if second
+       absolute difference is greater than first one or from third input
+       stream otherwise.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedmerge
+       Merge the first input stream with the second input stream using per
+       pixel weights in the third input stream.
+
+       A value of 0 in the third stream pixel component means that pixel
+       component from first stream is returned unchanged, while maximum value
+       (eg. 255 for 8-bit videos) means that pixel component from second
+       stream is returned unchanged. Intermediate values define the amount of
+       merging between both input stream's pixel components.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedmin
+       Merge the second and third input stream into output stream using
+       absolute differences between second input stream and first input stream
+       and absolute difference between third input stream and first input
+       stream. The picked value will be from second input stream if second
+       absolute difference is less than first one or from third input stream
+       otherwise.
+
+       This filter accepts the following options:
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from first stream.  By default value 0xf, all planes
+	   will be processed.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskedthreshold
+       Pick pixels comparing absolute difference of two video streams with
+       fixed threshold.
+
+       If absolute difference between pixel component of first and second
+       video stream is equal or lower than user supplied threshold than pixel
+       component from first video stream is picked, otherwise pixel component
+       from second video stream is picked.
+
+       This filter accepts the following options:
+
+       threshold
+	   Set threshold used when picking pixels from absolute difference
+	   from two input video streams.
+
+       planes
+	   Set which planes will be processed as bitmap, unprocessed planes
+	   will be copied from second stream.  By default value 0xf, all
+	   planes will be processed.
+
+       mode
+	   Set mode of filter operation. Can be "abs" or "diff".  Default is
+	   "abs".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   maskfun
+       Create mask from input video.
+
+       For example it is useful to create motion masks after "tblend" filter.
+
+       This filter accepts the following options:
+
+       low Set low threshold. Any pixel component lower or exact than this
+	   value will be set to 0.
+
+       high
+	   Set high threshold. Any pixel component higher than this value will
+	   be set to max value allowed for current pixel format.
+
+       planes
+	   Set planes to filter, by default all available planes are filtered.
+
+       fill
+	   Fill all frame pixels with this value.
+
+       sum Set max average pixel value for frame. If sum of all pixel
+	   components is higher that this average, output frame will be
+	   completely filled with value set by fill option.  Typically useful
+	   for scene changes when used in combination with "tblend" filter.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   mcdeint
+       Apply motion-compensation deinterlacing.
+
+       It needs one field per frame as input and must thus be used together
+       with yadif=1/3 or equivalent.
+
+       This filter accepts the following options:
+
+       mode
+	   Set the deinterlacing mode.
+
+	   It accepts one of the following values:
+
+	   fast
+	   medium
+	   slow
+	       use iterative motion estimation
+
+	   extra_slow
+	       like slow, but use multiple reference frames.
+
+	   Default value is fast.
+
+       parity
+	   Set the picture field parity assumed for the input video. It must
+	   be one of the following values:
+
+	   0, tff
+	       assume top field first
+
+	   1, bff
+	       assume bottom field first
+
+	   Default value is bff.
+
+       qp  Set per-block quantization parameter (QP) used by the internal
+	   encoder.
+
+	   Higher values should result in a smoother motion vector field but
+	   less optimal individual vectors. Default value is 1.
+
+   median
+       Pick median pixel from certain rectangle defined by radius.
+
+       This filter accepts the following options:
+
+       radius
+	   Set horizontal radius size. Default value is 1.  Allowed range is
+	   integer from 1 to 127.
+
+       planes
+	   Set which planes to process. Default is 15, which is all available
+	   planes.
+
+       radiusV
+	   Set vertical radius size. Default value is 0.  Allowed range is
+	   integer from 0 to 127.  If it is 0, value will be picked from
+	   horizontal "radius" option.
+
+       percentile
+	   Set median percentile. Default value is 0.5.  Default value of 0.5
+	   will pick always median values, while 0 will pick minimum values,
+	   and 1 maximum values.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+   mergeplanes
+       Merge color channel components from several video streams.
+
+       The filter accepts up to 4 input streams, and merge selected input
+       planes to the output video.
+
+       This filter accepts the following options:
+
+       mapping
+	   Set input to output plane mapping. Default is 0.
+
+	   The mappings is specified as a bitmap. It should be specified as a
+	   hexadecimal number in the form 0xAa[Bb[Cc[Dd]]]. 'Aa' describes the
+	   mapping for the first plane of the output stream. 'A' sets the
+	   number of the input stream to use (from 0 to 3), and 'a' the plane
+	   number of the corresponding input to use (from 0 to 3). The rest of
+	   the mappings is similar, 'Bb' describes the mapping for the output
+	   stream second plane, 'Cc' describes the mapping for the output
+	   stream third plane and 'Dd' describes the mapping for the output
+	   stream fourth plane.
+
+       format
+	   Set output pixel format. Default is "yuva444p".
+
+       map0s
+       map1s
+       map2s
+       map3s
+	   Set input to output stream mapping for output Nth plane. Default is
+	   0.
+
+       map0p
+       map1p
+       map2p
+       map3p
+	   Set input to output plane mapping for output Nth plane. Default is
+	   0.
+
+       Examples
+
+       o   Merge three gray video streams of same width and height into single
+	   video stream:
+
+		   [a0][a1][a2]mergeplanes=0x001020:yuv444p
+
+       o   Merge 1st yuv444p stream and 2nd gray video stream into yuva444p
+	   video stream:
+
+		   [a0][a1]mergeplanes=0x00010210:yuva444p
+
+       o   Swap Y and A plane in yuva444p stream:
+
+		   format=yuva444p,mergeplanes=0x03010200:yuva444p
+
+       o   Swap U and V plane in yuv420p stream:
+
+		   format=yuv420p,mergeplanes=0x000201:yuv420p
+
+       o   Cast a rgb24 clip to yuv444p:
+
+		   format=rgb24,mergeplanes=0x000102:yuv444p
+
+   mestimate
+       Estimate and export motion vectors using block matching algorithms.
+       Motion vectors are stored in frame side data to be used by other
+       filters.
+
+       This filter accepts the following options:
+
+       method
+	   Specify the motion estimation method. Accepts one of the following
+	   values:
+
+	   esa Exhaustive search algorithm.
+
+	   tss Three step search algorithm.
+
+	   tdls
+	       Two dimensional logarithmic search algorithm.
+
+	   ntss
+	       New three step search algorithm.
+
+	   fss Four step search algorithm.
+
+	   ds  Diamond search algorithm.
+
+	   hexbs
+	       Hexagon-based search algorithm.
+
+	   epzs
+	       Enhanced predictive zonal search algorithm.
+
+	   umh Uneven multi-hexagon search algorithm.
+
+	   Default value is esa.
+
+       mb_size
+	   Macroblock size. Default 16.
+
+       search_param
+	   Search parameter. Default 7.
+
+   midequalizer
+       Apply Midway Image Equalization effect using two video streams.
+
+       Midway Image Equalization adjusts a pair of images to have the same
+       histogram, while maintaining their dynamics as much as possible. It's
+       useful for e.g. matching exposures from a pair of stereo cameras.
+
+       This filter has two inputs and one output, which must be of same pixel
+       format, but may be of different sizes. The output of filter is first
+       input adjusted with midway histogram of both inputs.
+
+       This filter accepts the following option:
+
+       planes
+	   Set which planes to process. Default is 15, which is all available
+	   planes.
+
+   minterpolate
+       Convert the video to specified frame rate using motion interpolation.
+
+       This filter accepts the following options:
+
+       fps Specify the output frame rate. This can be rational e.g.
+	   "60000/1001". Frames are dropped if fps is lower than source fps.
+	   Default 60.
+
+       mi_mode
+	   Motion interpolation mode. Following values are accepted:
+
+	   dup Duplicate previous or next frame for interpolating new ones.
+
+	   blend
+	       Blend source frames. Interpolated frame is mean of previous and
+	       next frames.
+
+	   mci Motion compensated interpolation. Following options are
+	       effective when this mode is selected:
+
+	       mc_mode
+		   Motion compensation mode. Following values are accepted:
+
+		   obmc
+		       Overlapped block motion compensation.
+
+		   aobmc
+		       Adaptive overlapped block motion compensation. Window
+		       weighting coefficients are controlled adaptively
+		       according to the reliabilities of the neighboring
+		       motion vectors to reduce oversmoothing.
+
+		   Default mode is obmc.
+
+	       me_mode
+		   Motion estimation mode. Following values are accepted:
+
+		   bidir
+		       Bidirectional motion estimation. Motion vectors are
+		       estimated for each source frame in both forward and
+		       backward directions.
+
+		   bilat
+		       Bilateral motion estimation. Motion vectors are
+		       estimated directly for interpolated frame.
+
+		   Default mode is bilat.
+
+	       me  The algorithm to be used for motion estimation. Following
+		   values are accepted:
+
+		   esa Exhaustive search algorithm.
+
+		   tss Three step search algorithm.
+
+		   tdls
+		       Two dimensional logarithmic search algorithm.
+
+		   ntss
+		       New three step search algorithm.
+
+		   fss Four step search algorithm.
+
+		   ds  Diamond search algorithm.
+
+		   hexbs
+		       Hexagon-based search algorithm.
+
+		   epzs
+		       Enhanced predictive zonal search algorithm.
+
+		   umh Uneven multi-hexagon search algorithm.
+
+		   Default algorithm is epzs.
+
+	       mb_size
+		   Macroblock size. Default 16.
+
+	       search_param
+		   Motion estimation search parameter. Default 32.
+
+	       vsbmc
+		   Enable variable-size block motion compensation. Motion
+		   estimation is applied with smaller block sizes at object
+		   boundaries in order to make them less blurry. Default is 0
+		   (disabled).
+
+       scd Scene change detection method. Scene change leads motion vectors to
+	   be in random direction. Scene change detection replace interpolated
+	   frames by duplicate ones. May not be needed for other modes.
+	   Following values are accepted:
+
+	   none
+	       Disable scene change detection.
+
+	   fdiff
+	       Frame difference. Corresponding pixel values are compared and
+	       if it satisfies scd_threshold scene change is detected.
+
+	   Default method is fdiff.
+
+       scd_threshold
+	   Scene change detection threshold. Default is 10..
+
+   mix
+       Mix several video input streams into one video stream.
+
+       A description of the accepted options follows.
+
+       inputs
+	   The number of inputs. If unspecified, it defaults to 2.
+
+       weights
+	   Specify weight of each input video stream as sequence.  Each weight
+	   is separated by space. If number of weights is smaller than number
+	   of frames last specified weight will be used for all remaining
+	   unset weights.
+
+       scale
+	   Specify scale, if it is set it will be multiplied with sum of each
+	   weight multiplied with pixel values to give final destination pixel
+	   value. By default scale is auto scaled to sum of weights.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       duration
+	   Specify how end of stream is determined.
+
+	   longest
+	       The duration of the longest input. (default)
+
+	   shortest
+	       The duration of the shortest input.
+
+	   first
+	       The duration of the first input.
+
+       Commands
+
+       This filter supports the following commands:
+
+       weights
+       scale
+       planes
+	   Syntax is same as option with same name.
+
+   monochrome
+       Convert video to gray using custom color filter.
+
+       A description of the accepted options follows.
+
+       cb  Set the chroma blue spot. Allowed range is from -1 to 1.  Default
+	   value is 0.
+
+       cr  Set the chroma red spot. Allowed range is from -1 to 1.  Default
+	   value is 0.
+
+       size
+	   Set the color filter size. Allowed range is from .1 to 10.  Default
+	   value is 1.
+
+       high
+	   Set the highlights strength. Allowed range is from 0 to 1.  Default
+	   value is 0.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   morpho
+       This filter allows to apply main morphological grayscale transforms,
+       erode and dilate with arbitrary structures set in second input stream.
+
+       Unlike naive implementation and much slower performance in erosion and
+       dilation filters, when speed is critical "morpho" filter should be used
+       instead.
+
+       A description of accepted options follows,
+
+       mode
+	   Set morphological transform to apply, can be:
+
+	   erode
+	   dilate
+	   open
+	   close
+	   gradient
+	   tophat
+	   blackhat
+
+	   Default is "erode".
+
+       planes
+	   Set planes to filter, by default all planes except alpha are
+	   filtered.
+
+       structure
+	   Set which structure video frames will be processed from second
+	   input stream, can be first or all. Default is all.
+
+       The "morpho" filter also supports the framesync options.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   mpdecimate
+       Drop frames that do not differ greatly from the previous frame in order
+       to reduce frame rate.
+
+       The main use of this filter is for very-low-bitrate encoding (e.g.
+       streaming over dialup modem), but it could in theory be used for fixing
+       movies that were inverse-telecined incorrectly.
+
+       A description of the accepted options follows.
+
+       max Set the maximum number of consecutive frames which can be dropped
+	   (if positive), or the minimum interval between dropped frames (if
+	   negative). If the value is 0, the frame is dropped disregarding the
+	   number of previous sequentially dropped frames.
+
+	   Default value is 0.
+
+       keep
+	   Set the maximum number of consecutive similar frames to ignore
+	   before to start dropping them.  If the value is 0, the frame is
+	   dropped disregarding the number of previous sequentially similar
+	   frames.
+
+	   Default value is 0.
+
+       hi
+       lo
+       frac
+	   Set the dropping threshold values.
+
+	   Values for hi and lo are for 8x8 pixel blocks and represent actual
+	   pixel value differences, so a threshold of 64 corresponds to 1 unit
+	   of difference for each pixel, or the same spread out differently
+	   over the block.
+
+	   A frame is a candidate for dropping if no 8x8 blocks differ by more
+	   than a threshold of hi, and if no more than frac blocks (1 meaning
+	   the whole image) differ by more than a threshold of lo.
+
+	   Default value for hi is 64*12, default value for lo is 64*5, and
+	   default value for frac is 0.33.
+
+   msad
+       Obtain the MSAD (Mean Sum of Absolute Differences) between two input
+       videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained per component, average, min and max MSAD is printed
+       through the logging system.
+
+       The filter stores the calculated MSAD of each frame in frame metadata.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi msad -f null -
+
+   multiply
+       Multiply first video stream pixels values with second video stream
+       pixels values.
+
+       The filter accepts the following options:
+
+       scale
+	   Set the scale applied to second video stream. By default is 1.
+	   Allowed range is from 0 to 9.
+
+       offset
+	   Set the offset applied to second video stream. By default is 0.5.
+	   Allowed range is from "-1" to 1.
+
+       planes
+	   Specify planes from input video stream that will be processed.  By
+	   default all planes are processed.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   negate
+       Negate (invert) the input video.
+
+       It accepts the following option:
+
+       components
+	   Set components to negate.
+
+	   Available values for components are:
+
+	   y
+	   u
+	   v
+	   a
+	   r
+	   g
+	   b
+       negate_alpha
+	   With value 1, it negates the alpha component, if present. Default
+	   value is 0.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   nlmeans
+       Denoise frames using Non-Local Means algorithm.
+
+       Each pixel is adjusted by looking for other pixels with similar
+       contexts. This context similarity is defined by comparing their
+       surrounding patches of size pxp. Patches are searched in an area of rxr
+       around the pixel.
+
+       Note that the research area defines centers for patches, which means
+       some patches will be made of pixels outside that research area.
+
+       The filter accepts the following options.
+
+       s   Set denoising strength. Default is 1.0. Must be in range [1.0,
+	   30.0].
+
+       p   Set patch size. Default is 7. Must be odd number in range [0, 99].
+
+       pc  Same as p but for chroma planes.
+
+	   The default value is 0 and means automatic.
+
+       r   Set research size. Default is 15. Must be odd number in range [0,
+	   99].
+
+       rc  Same as r but for chroma planes.
+
+	   The default value is 0 and means automatic.
+
+   nnedi
+       Deinterlace video using neural network edge directed interpolation.
+
+       This filter accepts the following options:
+
+       weights
+	   Mandatory option, without binary file filter can not work.
+	   Currently file can be found here:
+	   https://github.com/dubhater/vapoursynth-nnedi3/blob/master/src/nnedi3_weights.bin
+
+       deint
+	   Set which frames to deinterlace, by default it is "all".  Can be
+	   "all" or "interlaced".
+
+       field
+	   Set mode of operation.
+
+	   Can be one of the following:
+
+	   af  Use frame flags, both fields.
+
+	   a   Use frame flags, single field.
+
+	   t   Use top field only.
+
+	   b   Use bottom field only.
+
+	   tf  Use both fields, top first.
+
+	   bf  Use both fields, bottom first.
+
+       planes
+	   Set which planes to process, by default filter process all frames.
+
+       nsize
+	   Set size of local neighborhood around each pixel, used by the
+	   predictor neural network.
+
+	   Can be one of the following:
+
+	   s8x6
+	   s16x6
+	   s32x6
+	   s48x6
+	   s8x4
+	   s16x4
+	   s32x4
+       nns Set the number of neurons in predictor neural network.  Can be one
+	   of the following:
+
+	   n16
+	   n32
+	   n64
+	   n128
+	   n256
+       qual
+	   Controls the number of different neural network predictions that
+	   are blended together to compute the final output value. Can be
+	   "fast", default or "slow".
+
+       etype
+	   Set which set of weights to use in the predictor.  Can be one of
+	   the following:
+
+	   a, abs
+	       weights trained to minimize absolute error
+
+	   s, mse
+	       weights trained to minimize squared error
+
+       pscrn
+	   Controls whether or not the prescreener neural network is used to
+	   decide which pixels should be processed by the predictor neural
+	   network and which can be handled by simple cubic interpolation.
+	   The prescreener is trained to know whether cubic interpolation will
+	   be sufficient for a pixel or whether it should be predicted by the
+	   predictor nn.  The computational complexity of the prescreener nn
+	   is much less than that of the predictor nn. Since most pixels can
+	   be handled by cubic interpolation, using the prescreener generally
+	   results in much faster processing.  The prescreener is pretty
+	   accurate, so the difference between using it and not using it is
+	   almost always unnoticeable.
+
+	   Can be one of the following:
+
+	   none
+	   original
+	   new
+	   new2
+	   new3
+
+	   Default is "new".
+
+       Commands
+
+       This filter supports same commands as options, excluding weights
+       option.
+
+   noformat
+       Force libavfilter not to use any of the specified pixel formats for the
+       input to the next filter.
+
+       It accepts the following parameters:
+
+       pix_fmts
+	   A '|'-separated list of pixel format names, such as
+	   pix_fmts=yuv420p|monow|rgb24".
+
+       Examples
+
+       o   Force libavfilter to use a format different from yuv420p for the
+	   input to the vflip filter:
+
+		   noformat=pix_fmts=yuv420p,vflip
+
+       o   Convert the input video to any of the formats not contained in the
+	   list:
+
+		   noformat=yuv420p|yuv444p|yuv410p
+
+   noise
+       Add noise on video input frame.
+
+       The filter accepts the following options:
+
+       all_seed
+       c0_seed
+       c1_seed
+       c2_seed
+       c3_seed
+	   Set noise seed for specific pixel component or all pixel components
+	   in case of all_seed. Default value is 123457.
+
+       all_strength, alls
+       c0_strength, c0s
+       c1_strength, c1s
+       c2_strength, c2s
+       c3_strength, c3s
+	   Set noise strength for specific pixel component or all pixel
+	   components in case all_strength. Default value is 0. Allowed range
+	   is [0, 100].
+
+       all_flags, allf
+       c0_flags, c0f
+       c1_flags, c1f
+       c2_flags, c2f
+       c3_flags, c3f
+	   Set pixel component flags or set flags for all components if
+	   all_flags.  Available values for component flags are:
+
+	   a   averaged temporal noise (smoother)
+
+	   p   mix random noise with a (semi)regular pattern
+
+	   t   temporal noise (noise pattern changes between frames)
+
+	   u   uniform noise (gaussian otherwise)
+
+       Examples
+
+       Add temporal and uniform noise to input video:
+
+	       noise=alls=20:allf=t+u
+
+   normalize
+       Normalize RGB video (aka histogram stretching, contrast stretching).
+       See: https://en.wikipedia.org/wiki/Normalization_(image_processing)
+
+       For each channel of each frame, the filter computes the input range and
+       maps it linearly to the user-specified output range. The output range
+       defaults to the full dynamic range from pure black to pure white.
+
+       Temporal smoothing can be used on the input range to reduce flickering
+       (rapid changes in brightness) caused when small dark or bright objects
+       enter or leave the scene. This is similar to the auto-exposure
+       (automatic gain control) on a video camera, and, like a video camera,
+       it may cause a period of over- or under-exposure of the video.
+
+       The R,G,B channels can be normalized independently, which may cause
+       some color shifting, or linked together as a single channel, which
+       prevents color shifting. Linked normalization preserves hue.
+       Independent normalization does not, so it can be used to remove some
+       color casts. Independent and linked normalization can be combined in
+       any ratio.
+
+       The normalize filter accepts the following options:
+
+       blackpt
+       whitept
+	   Colors which define the output range. The minimum input value is
+	   mapped to the blackpt. The maximum input value is mapped to the
+	   whitept.  The defaults are black and white respectively. Specifying
+	   white for blackpt and black for whitept will give color-inverted,
+	   normalized video. Shades of grey can be used to reduce the dynamic
+	   range (contrast). Specifying saturated colors here can create some
+	   interesting effects.
+
+       smoothing
+	   The number of previous frames to use for temporal smoothing. The
+	   input range of each channel is smoothed using a rolling average
+	   over the current frame and the smoothing previous frames. The
+	   default is 0 (no temporal smoothing).
+
+       independence
+	   Controls the ratio of independent (color shifting) channel
+	   normalization to linked (color preserving) normalization. 0.0 is
+	   fully linked, 1.0 is fully independent. Defaults to 1.0 (fully
+	   independent).
+
+       strength
+	   Overall strength of the filter. 1.0 is full strength. 0.0 is a
+	   rather expensive no-op. Defaults to 1.0 (full strength).
+
+       Commands
+
+       This filter supports same commands as options, excluding smoothing
+       option.	The command accepts the same syntax of the corresponding
+       option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+       Examples
+
+       Stretch video contrast to use the full dynamic range, with no temporal
+       smoothing; may flicker depending on the source content:
+
+	       normalize=blackpt=black:whitept=white:smoothing=0
+
+       As above, but with 50 frames of temporal smoothing; flicker should be
+       reduced, depending on the source content:
+
+	       normalize=blackpt=black:whitept=white:smoothing=50
+
+       As above, but with hue-preserving linked channel normalization:
+
+	       normalize=blackpt=black:whitept=white:smoothing=50:independence=0
+
+       As above, but with half strength:
+
+	       normalize=blackpt=black:whitept=white:smoothing=50:independence=0:strength=0.5
+
+       Map the darkest input color to red, the brightest input color to cyan:
+
+	       normalize=blackpt=red:whitept=cyan
+
+   null
+       Pass the video source unchanged to the output.
+
+   ocr
+       Optical Character Recognition
+
+       This filter uses Tesseract for optical character recognition. To enable
+       compilation of this filter, you need to configure FFmpeg with
+       "--enable-libtesseract".
+
+       It accepts the following options:
+
+       datapath
+	   Set datapath to tesseract data. Default is to use whatever was set
+	   at installation.
+
+       language
+	   Set language, default is "eng".
+
+       whitelist
+	   Set character whitelist.
+
+       blacklist
+	   Set character blacklist.
+
+       The filter exports recognized text as the frame metadata
+       "lavfi.ocr.text".  The filter exports confidence of recognized words as
+       the frame metadata "lavfi.ocr.confidence".
+
+   ocv
+       Apply a video transform using libopencv.
+
+       To enable this filter, install the libopencv library and headers and
+       configure FFmpeg with "--enable-libopencv".
+
+       It accepts the following parameters:
+
+       filter_name
+	   The name of the libopencv filter to apply.
+
+       filter_params
+	   The parameters to pass to the libopencv filter. If not specified,
+	   the default values are assumed.
+
+       Refer to the official libopencv documentation for more precise
+       information:
+       <http://docs.opencv.org/master/modules/imgproc/doc/filtering.html>
+
+       Several libopencv filters are supported; see the following subsections.
+
+       dilate
+
+       Dilate an image by using a specific structuring element.  It
+       corresponds to the libopencv function "cvDilate".
+
+       It accepts the parameters: struct_el|nb_iterations.
+
+       struct_el represents a structuring element, and has the syntax:
+       colsxrows+anchor_xxanchor_y/shape
+
+       cols and rows represent the number of columns and rows of the
+       structuring element, anchor_x and anchor_y the anchor point, and shape
+       the shape for the structuring element. shape must be "rect", "cross",
+       "ellipse", or "custom".
+
+       If the value for shape is "custom", it must be followed by a string of
+       the form "=filename". The file with name filename is assumed to
+       represent a binary image, with each printable character corresponding
+       to a bright pixel. When a custom shape is used, cols and rows are
+       ignored, the number or columns and rows of the read file are assumed
+       instead.
+
+       The default value for struct_el is "3x3+0x0/rect".
+
+       nb_iterations specifies the number of times the transform is applied to
+       the image, and defaults to 1.
+
+       Some examples:
+
+	       # Use the default values
+	       ocv=dilate
+
+	       # Dilate using a structuring element with a 5x5 cross, iterating two times
+	       ocv=filter_name=dilate:filter_params=5x5+2x2/cross|2
+
+	       # Read the shape from the file diamond.shape, iterating two times.
+	       # The file diamond.shape may contain a pattern of characters like this
+	       #   *
+	       #  ***
+	       # *****
+	       #  ***
+	       #   *
+	       # The specified columns and rows are ignored
+	       # but the anchor point coordinates are not
+	       ocv=dilate:0x0+2x2/custom=diamond.shape|2
+
+       erode
+
+       Erode an image by using a specific structuring element.	It corresponds
+       to the libopencv function "cvErode".
+
+       It accepts the parameters: struct_el:nb_iterations, with the same
+       syntax and semantics as the dilate filter.
+
+       smooth
+
+       Smooth the input video.
+
+       The filter takes the following parameters:
+       type|param1|param2|param3|param4.
+
+       type is the type of smooth filter to apply, and must be one of the
+       following values: "blur", "blur_no_scale", "median", "gaussian", or
+       "bilateral". The default value is "gaussian".
+
+       The meaning of param1, param2, param3, and param4 depends on the smooth
+       type. param1 and param2 accept integer positive values or 0. param3 and
+       param4 accept floating point values.
+
+       The default value for param1 is 3. The default value for the other
+       parameters is 0.
+
+       These parameters correspond to the parameters assigned to the libopencv
+       function "cvSmooth".
+
+   oscilloscope
+       2D Video Oscilloscope.
+
+       Useful to measure spatial impulse, step responses, chroma delays, etc.
+
+       It accepts the following parameters:
+
+       x   Set scope center x position.
+
+       y   Set scope center y position.
+
+       s   Set scope size, relative to frame diagonal.
+
+       t   Set scope tilt/rotation.
+
+       o   Set trace opacity.
+
+       tx  Set trace center x position.
+
+       ty  Set trace center y position.
+
+       tw  Set trace width, relative to width of frame.
+
+       th  Set trace height, relative to height of frame.
+
+       c   Set which components to trace. By default it traces first three
+	   components.
+
+       g   Draw trace grid. By default is enabled.
+
+       st  Draw some statistics. By default is enabled.
+
+       sc  Draw scope. By default is enabled.
+
+       Commands
+
+       This filter supports same commands as options.  The command accepts the
+       same syntax of the corresponding option.
+
+       If the specified expression is not valid, it is kept at its current
+       value.
+
+       Examples
+
+       o   Inspect full first row of video frame.
+
+		   oscilloscope=x=0.5:y=0:s=1
+
+       o   Inspect full last row of video frame.
+
+		   oscilloscope=x=0.5:y=1:s=1
+
+       o   Inspect full 5th line of video frame of height 1080.
+
+		   oscilloscope=x=0.5:y=5/1080:s=1
+
+       o   Inspect full last column of video frame.
+
+		   oscilloscope=x=1:y=0.5:s=1:t=1
+
+   overlay
+       Overlay one video on top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.
+
+       It accepts the following parameters:
+
+       A description of the accepted options follows.
+
+       x
+       y   Set the expression for the x and y coordinates of the overlaid
+	   video on the main video. Default value is "0" for both expressions.
+	   In case the expression is invalid, it is set to a huge value
+	   (meaning that the overlay will not be displayed within the output
+	   visible area).
+
+       eof_action
+	   See framesync.
+
+       eval
+	   Set when the expressions for x, and y are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       only evaluate expressions once during the filter initialization
+	       or when a command is processed
+
+	   frame
+	       evaluate expressions for each incoming frame
+
+	   Default value is frame.
+
+       shortest
+	   See framesync.
+
+       format
+	   Set the format for the output video.
+
+	   It accepts the following values:
+
+	   yuv420
+	       force YUV 4:2:0 8-bit planar output
+
+	   yuv420p10
+	       force YUV 4:2:0 10-bit planar output
+
+	   yuv422
+	       force YUV 4:2:2 8-bit planar output
+
+	   yuv422p10
+	       force YUV 4:2:2 10-bit planar output
+
+	   yuv444
+	       force YUV 4:4:4 8-bit planar output
+
+	   yuv444p10
+	       force YUV 4:4:4 10-bit planar output
+
+	   rgb force RGB 8-bit packed output
+
+	   gbrp
+	       force RGB 8-bit planar output
+
+	   auto
+	       automatically pick format
+
+	   Default value is yuv420.
+
+       repeatlast
+	   See framesync.
+
+       alpha
+	   Set format of alpha of the overlaid video, it can be straight or
+	   premultiplied. Default is straight.
+
+       The x, and y expressions can contain the following parameters.
+
+       main_w, W
+       main_h, H
+	   The main input width and height.
+
+       overlay_w, w
+       overlay_h, h
+	   The overlay input width and height.
+
+       x
+       y   The computed values for x and y. They are evaluated for each new
+	   frame.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values of the output
+	   format. For example for the pixel format "yuv422p" hsub is 2 and
+	   vsub is 1.
+
+       n   the number of input frame, starting from 0
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       t   The timestamp, expressed in seconds. It's NAN if the input
+	   timestamp is unknown.
+
+       This filter also supports the framesync options.
+
+       Note that the n, t variables are available only when evaluation is done
+       per frame, and will evaluate to NAN when eval is set to init.
+
+       Be aware that frames are taken from each input video in timestamp
+       order, hence, if their initial timestamps differ, it is a good idea to
+       pass the two inputs through a setpts=PTS-STARTPTS filter to have them
+       begin in the same zero timestamp, as the example for the movie filter
+       does.
+
+       You can chain together more overlays but you should test the efficiency
+       of such approach.
+
+       Commands
+
+       This filter supports the following commands:
+
+       x
+       y   Modify the x and y of the overlay input.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+       Examples
+
+       o   Draw the overlay at 10 pixels from the bottom right corner of the
+	   main video:
+
+		   overlay=main_w-overlay_w-10:main_h-overlay_h-10
+
+	   Using named options the example above becomes:
+
+		   overlay=x=main_w-overlay_w-10:y=main_h-overlay_h-10
+
+       o   Insert a transparent PNG logo in the bottom left corner of the
+	   input, using the ffmpeg tool with the "-filter_complex" option:
+
+		   ffmpeg -i input -i logo -filter_complex 'overlay=10:main_h-overlay_h-10' output
+
+       o   Insert 2 different transparent PNG logos (second logo on bottom
+	   right corner) using the ffmpeg tool:
+
+		   ffmpeg -i input -i logo1 -i logo2 -filter_complex 'overlay=x=10:y=H-h-10,overlay=x=W-w-10:y=H-h-10' output
+
+       o   Add a transparent color layer on top of the main video; "WxH" must
+	   specify the size of the main input to the overlay filter:
+
+		   color=color=red@.3:size=WxH [over]; [in][over] overlay [out]
+
+       o   Play an original video and a filtered version (here with the
+	   deshake filter) side by side using the ffplay tool:
+
+		   ffplay input.avi -vf 'split[a][b]; [a]pad=iw*2:ih[src]; [b]deshake[filt]; [src][filt]overlay=w'
+
+	   The above command is the same as:
+
+		   ffplay input.avi -vf 'split[b], pad=iw*2[src], [b]deshake, [src]overlay=w'
+
+       o   Make a sliding overlay appearing from the left to the right top
+	   part of the screen starting since time 2:
+
+		   overlay=x='if(gte(t,2), -w+(t-2)*20, NAN)':y=0
+
+       o   Compose output by putting two input videos side to side:
+
+		   ffmpeg -i left.avi -i right.avi -filter_complex "
+		   nullsrc=size=200x100 [background];
+		   [0:v] setpts=PTS-STARTPTS, scale=100x100 [left];
+		   [1:v] setpts=PTS-STARTPTS, scale=100x100 [right];
+		   [background][left]	    overlay=shortest=1	     [background+left];
+		   [background+left][right] overlay=shortest=1:x=100 [left+right]
+		   "
+
+       o   Mask 10-20 seconds of a video by applying the delogo filter to a
+	   section
+
+		   ffmpeg -i test.avi -codec:v:0 wmv2 -ar 11025 -b:v 9000k
+		   -vf '[in]split[split_main][split_delogo];[split_delogo]trim=start=360:end=371,delogo=0:0:640:480[delogoed];[split_main][delogoed]overlay=eof_action=pass[out]'
+		   masked.avi
+
+       o   Chain several overlays in cascade:
+
+		   nullsrc=s=200x200 [bg];
+		   testsrc=s=100x100, split=4 [in0][in1][in2][in3];
+		   [in0] lutrgb=r=0, [bg]   overlay=0:0     [mid0];
+		   [in1] lutrgb=g=0, [mid0] overlay=100:0   [mid1];
+		   [in2] lutrgb=b=0, [mid1] overlay=0:100   [mid2];
+		   [in3] null,	     [mid2] overlay=100:100 [out0]
+
+   overlay_cuda
+       Overlay one video on top of another.
+
+       This is the CUDA variant of the overlay filter.	It only accepts CUDA
+       frames. The underlying input pixel formats have to match.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.
+
+       It accepts the following parameters:
+
+       x
+       y   Set expressions for the x and y coordinates of the overlaid video
+	   on the main video.
+
+	   They can contain the following parameters:
+
+	   main_w, W
+	   main_h, H
+	       The main input width and height.
+
+	   overlay_w, w
+	   overlay_h, h
+	       The overlay input width and height.
+
+	   x
+	   y   The computed values for x and y. They are evaluated for each
+	       new frame.
+
+	   n   The ordinal index of the main input frame, starting from 0.
+
+	   pos The byte offset position in the file of the main input frame,
+	       NAN if unknown.	Deprecated, do not use.
+
+	   t   The timestamp of the main input frame, expressed in seconds,
+	       NAN if unknown.
+
+	   Default value is "0" for both expressions.
+
+       eval
+	   Set when the expressions for x and y are evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       Evaluate expressions once during filter initialization or when
+	       a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame
+
+	   Default value is frame.
+
+       eof_action
+	   See framesync.
+
+       shortest
+	   See framesync.
+
+       repeatlast
+	   See framesync.
+
+       This filter also supports the framesync options.
+
+   owdenoise
+       Apply Overcomplete Wavelet denoiser.
+
+       The filter accepts the following options:
+
+       depth
+	   Set depth.
+
+	   Larger depth values will denoise lower frequency components more,
+	   but slow down filtering.
+
+	   Must be an int in the range 8-16, default is 8.
+
+       luma_strength, ls
+	   Set luma strength.
+
+	   Must be a double value in the range 0-1000, default is 1.0.
+
+       chroma_strength, cs
+	   Set chroma strength.
+
+	   Must be a double value in the range 0-1000, default is 1.0.
+
+   pad
+       Add paddings to the input image, and place the original input at the
+       provided x, y coordinates.
+
+       It accepts the following parameters:
+
+       width, w
+       height, h
+	   Specify an expression for the size of the output image with the
+	   paddings added. If the value for width or height is 0, the
+	   corresponding input size is used for the output.
+
+	   The width expression can reference the value set by the height
+	   expression, and vice versa.
+
+	   The default value of width and height is 0.
+
+       x
+       y   Specify the offsets to place the input image at within the padded
+	   area, with respect to the top/left border of the output image.
+
+	   The x expression can reference the value set by the y expression,
+	   and vice versa.
+
+	   The default value of x and y is 0.
+
+	   If x or y evaluate to a negative number, they'll be changed so the
+	   input image is centered on the padded area.
+
+       color
+	   Specify the color of the padded area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of color is "black".
+
+       eval
+	   Specify when to evaluate  width, height, x and y expression.
+
+	   It accepts the following values:
+
+	   init
+	       Only evaluate expressions once during the filter initialization
+	       or when a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+	   Default value is init.
+
+       aspect
+	   Pad to aspect instead to a resolution.
+
+       The value for the width, height, x, and y options are expressions
+       containing the following constants:
+
+       in_w
+       in_h
+	   The input video width and height.
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output width and height (the size of the padded area), as
+	   specified by the width and height expressions.
+
+       ow
+       oh  These are the same as out_w and out_h.
+
+       x
+       y   The x and y offsets as specified by the x and y expressions, or NAN
+	   if not yet specified.
+
+       a   same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (iw / ih) * sar
+
+       hsub
+       vsub
+	   The horizontal and vertical chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       Examples
+
+       o   Add paddings with the color "violet" to the input video. The output
+	   video size is 640x480, and the top-left corner of the input video
+	   is placed at column 0, row 40
+
+		   pad=640:480:0:40:violet
+
+	   The example above is equivalent to the following command:
+
+		   pad=width=640:height=480:x=0:y=40:color=violet
+
+       o   Pad the input to get an output with dimensions increased by 3/2,
+	   and put the input video at the center of the padded area:
+
+		   pad="3/2*iw:3/2*ih:(ow-iw)/2:(oh-ih)/2"
+
+       o   Pad the input to get a squared output with size equal to the
+	   maximum value between the input width and height, and put the input
+	   video at the center of the padded area:
+
+		   pad="max(iw\,ih):ow:(ow-iw)/2:(oh-ih)/2"
+
+       o   Pad the input to get a final w/h ratio of 16:9:
+
+		   pad="ih*16/9:ih:(ow-iw)/2:(oh-ih)/2"
+
+       o   In case of anamorphic video, in order to set the output display
+	   aspect correctly, it is necessary to use sar in the expression,
+	   according to the relation:
+
+		   (ih * X / ih) * sar = output_dar
+		   X = output_dar / sar
+
+	   Thus the previous example needs to be modified to:
+
+		   pad="ih*16/9/sar:ih:(ow-iw)/2:(oh-ih)/2"
+
+       o   Double the output size and put the input video in the bottom-right
+	   corner of the output padded area:
+
+		   pad="2*iw:2*ih:ow-iw:oh-ih"
+
+   palettegen
+       Generate one palette for a whole video stream.
+
+       It accepts the following options:
+
+       max_colors
+	   Set the maximum number of colors to quantize in the palette.  Note:
+	   the palette will still contain 256 colors; the unused palette
+	   entries will be black.
+
+       reserve_transparent
+	   Create a palette of 255 colors maximum and reserve the last one for
+	   transparency. Reserving the transparency color is useful for GIF
+	   optimization.  If not set, the maximum of colors in the palette
+	   will be 256. You probably want to disable this option for a
+	   standalone image.  Set by default.
+
+       transparency_color
+	   Set the color that will be used as background for transparency.
+
+       stats_mode
+	   Set statistics mode.
+
+	   It accepts the following values:
+
+	   full
+	       Compute full frame histograms.
+
+	   diff
+	       Compute histograms only for the part that differs from previous
+	       frame. This might be relevant to give more importance to the
+	       moving part of your input if the background is static.
+
+	   single
+	       Compute new histogram for each frame.
+
+	   Default value is full.
+
+       The filter also exports the frame metadata "lavfi.color_quant_ratio"
+       ("nb_color_in / nb_color_out") which you can use to evaluate the degree
+       of color quantization of the palette. This information is also visible
+       at info logging level.
+
+       Examples
+
+       o   Generate a representative palette of a given video using ffmpeg:
+
+		   ffmpeg -i input.mkv -vf palettegen palette.png
+
+   paletteuse
+       Use a palette to downsample an input video stream.
+
+       The filter takes two inputs: one video stream and a palette. The
+       palette must be a 256 pixels image.
+
+       It accepts the following options:
+
+       dither
+	   Select dithering mode. Available algorithms are:
+
+	   bayer
+	       Ordered 8x8 bayer dithering (deterministic)
+
+	   heckbert
+	       Dithering as defined by Paul Heckbert in 1982 (simple error
+	       diffusion).  Note: this dithering is sometimes considered
+	       "wrong" and is included as a reference.
+
+	   floyd_steinberg
+	       Floyd and Steingberg dithering (error diffusion)
+
+	   sierra2
+	       Frankie Sierra dithering v2 (error diffusion)
+
+	   sierra2_4a
+	       Frankie Sierra dithering v2 "Lite" (error diffusion)
+
+	   sierra3
+	       Frankie Sierra dithering v3 (error diffusion)
+
+	   burkes
+	       Burkes dithering (error diffusion)
+
+	   atkinson
+	       Atkinson dithering by Bill Atkinson at Apple Computer (error
+	       diffusion)
+
+	   none
+	       Disable dithering.
+
+	   Default is sierra2_4a.
+
+       bayer_scale
+	   When bayer dithering is selected, this option defines the scale of
+	   the pattern (how much the crosshatch pattern is visible). A low
+	   value means more visible pattern for less banding, and higher value
+	   means less visible pattern at the cost of more banding.
+
+	   The option must be an integer value in the range [0,5]. Default is
+	   2.
+
+       diff_mode
+	   If set, define the zone to process
+
+	   rectangle
+	       Only the changing rectangle will be reprocessed. This is
+	       similar to GIF cropping/offsetting compression mechanism. This
+	       option can be useful for speed if only a part of the image is
+	       changing, and has use cases such as limiting the scope of the
+	       error diffusal dither to the rectangle that bounds the moving
+	       scene (it leads to more deterministic output if the scene
+	       doesn't change much, and as a result less moving noise and
+	       better GIF compression).
+
+	   Default is none.
+
+       new Take new palette for each output frame.
+
+       alpha_threshold
+	   Sets the alpha threshold for transparency. Alpha values above this
+	   threshold will be treated as completely opaque, and values below
+	   this threshold will be treated as completely transparent.
+
+	   The option must be an integer value in the range [0,255]. Default
+	   is 128.
+
+       Examples
+
+       o   Use a palette (generated for example with palettegen) to encode a
+	   GIF using ffmpeg:
+
+		   ffmpeg -i input.mkv -i palette.png -lavfi paletteuse output.gif
+
+   perspective
+       Correct perspective of video not recorded perpendicular to the screen.
+
+       A description of the accepted parameters follows.
+
+       x0
+       y0
+       x1
+       y1
+       x2
+       y2
+       x3
+       y3  Set coordinates expression for top left, top right, bottom left and
+	   bottom right corners.  Default values are "0:0:W:0:0:H:W:H" with
+	   which perspective will remain unchanged.  If the "sense" option is
+	   set to "source", then the specified points will be sent to the
+	   corners of the destination. If the "sense" option is set to
+	   "destination", then the corners of the source will be sent to the
+	   specified coordinates.
+
+	   The expressions can use the following variables:
+
+	   W
+	   H   the width and height of video frame.
+
+	   in  Input frame count.
+
+	   on  Output frame count.
+
+       interpolation
+	   Set interpolation for perspective correction.
+
+	   It accepts the following values:
+
+	   linear
+	   cubic
+
+	   Default value is linear.
+
+       sense
+	   Set interpretation of coordinate options.
+
+	   It accepts the following values:
+
+	   0, source
+	       Send point in the source specified by the given coordinates to
+	       the corners of the destination.
+
+	   1, destination
+	       Send the corners of the source to the point in the destination
+	       specified by the given coordinates.
+
+	       Default value is source.
+
+       eval
+	   Set when the expressions for coordinates x0,y0,...x3,y3 are
+	   evaluated.
+
+	   It accepts the following values:
+
+	   init
+	       only evaluate expressions once during the filter initialization
+	       or when a command is processed
+
+	   frame
+	       evaluate expressions for each incoming frame
+
+	   Default value is init.
+
+   phase
+       Delay interlaced video by one field time so that the field order
+       changes.
+
+       The intended use is to fix PAL movies that have been captured with the
+       opposite field order to the film-to-video transfer.
+
+       A description of the accepted parameters follows.
+
+       mode
+	   Set phase mode.
+
+	   It accepts the following values:
+
+	   t   Capture field order top-first, transfer bottom-first.  Filter
+	       will delay the bottom field.
+
+	   b   Capture field order bottom-first, transfer top-first.  Filter
+	       will delay the top field.
+
+	   p   Capture and transfer with the same field order. This mode only
+	       exists for the documentation of the other options to refer to,
+	       but if you actually select it, the filter will faithfully do
+	       nothing.
+
+	   a   Capture field order determined automatically by field flags,
+	       transfer opposite.  Filter selects among t and b modes on a
+	       frame by frame basis using field flags. If no field information
+	       is available, then this works just like u.
+
+	   u   Capture unknown or varying, transfer opposite.  Filter selects
+	       among t and b on a frame by frame basis by analyzing the images
+	       and selecting the alternative that produces best match between
+	       the fields.
+
+	   T   Capture top-first, transfer unknown or varying.	Filter selects
+	       among t and p using image analysis.
+
+	   B   Capture bottom-first, transfer unknown or varying.  Filter
+	       selects among b and p using image analysis.
+
+	   A   Capture determined by field flags, transfer unknown or varying.
+	       Filter selects among t, b and p using field flags and image
+	       analysis. If no field information is available, then this works
+	       just like U. This is the default mode.
+
+	   U   Both capture and transfer unknown or varying.  Filter selects
+	       among t, b and p using image analysis only.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   photosensitivity
+       Reduce various flashes in video, so to help users with epilepsy.
+
+       It accepts the following options:
+
+       frames, f
+	   Set how many frames to use when filtering. Default is 30.
+
+       threshold, t
+	   Set detection threshold factor. Default is 1.  Lower is stricter.
+
+       skip
+	   Set how many pixels to skip when sampling frames. Default is 1.
+	   Allowed range is from 1 to 1024.
+
+       bypass
+	   Leave frames unchanged. Default is disabled.
+
+   pixdesctest
+       Pixel format descriptor test filter, mainly useful for internal
+       testing. The output video should be equal to the input video.
+
+       For example:
+
+	       format=monow, pixdesctest
+
+       can be used to test the monowhite pixel format descriptor definition.
+
+   pixelize
+       Apply pixelization to video stream.
+
+       The filter accepts the following options:
+
+       width, w
+       height, h
+	   Set block dimensions that will be used for pixelization.  Default
+	   value is 16.
+
+       mode, m
+	   Set the mode of pixelization used.
+
+	   Possible values are:
+
+	   avg
+	   min
+	   max
+
+	   Default value is "avg".
+
+       planes, p
+	   Set what planes to filter. Default is to filter all planes.
+
+       Commands
+
+       This filter supports all options as commands.
+
+   pixscope
+       Display sample values of color channels. Mainly useful for checking
+       color and levels. Minimum supported resolution is 640x480.
+
+       The filters accept the following options:
+
+       x   Set scope X position, relative offset on X axis.
+
+       y   Set scope Y position, relative offset on Y axis.
+
+       w   Set scope width.
+
+       h   Set scope height.
+
+       o   Set window opacity. This window also holds statistics about pixel
+	   area.
+
+       wx  Set window X position, relative offset on X axis.
+
+       wy  Set window Y position, relative offset on Y axis.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   pp
+       Enable the specified chain of postprocessing subfilters using
+       libpostproc. This library should be automatically selected with a GPL
+       build ("--enable-gpl").	Subfilters must be separated by '/' and can be
+       disabled by prepending a '-'.  Each subfilter and some options have a
+       short and a long name that can be used interchangeably, i.e. dr/dering
+       are the same.
+
+       The filters accept the following options:
+
+       subfilters
+	   Set postprocessing subfilters string.
+
+       All subfilters share common options to determine their scope:
+
+       a/autoq
+	   Honor the quality commands for this subfilter.
+
+       c/chrom
+	   Do chrominance filtering, too (default).
+
+       y/nochrom
+	   Do luma filtering only (no chrominance).
+
+       n/noluma
+	   Do chrominance filtering only (no luma).
+
+       These options can be appended after the subfilter name, separated by a
+       '|'.
+
+       Available subfilters are:
+
+       hb/hdeblock[|difference[|flatness]]
+	   Horizontal deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       vb/vdeblock[|difference[|flatness]]
+	   Vertical deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       ha/hadeblock[|difference[|flatness]]
+	   Accurate horizontal deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       va/vadeblock[|difference[|flatness]]
+	   Accurate vertical deblocking filter
+
+	   difference
+	       Difference factor where higher values mean more deblocking
+	       (default: 32).
+
+	   flatness
+	       Flatness threshold where lower values mean more deblocking
+	       (default: 39).
+
+       The horizontal and vertical deblocking filters share the difference and
+       flatness values so you cannot set different horizontal and vertical
+       thresholds.
+
+       h1/x1hdeblock
+	   Experimental horizontal deblocking filter
+
+       v1/x1vdeblock
+	   Experimental vertical deblocking filter
+
+       dr/dering
+	   Deringing filter
+
+       tn/tmpnoise[|threshold1[|threshold2[|threshold3]]], temporal noise
+       reducer
+	   threshold1
+	       larger -> stronger filtering
+
+	   threshold2
+	       larger -> stronger filtering
+
+	   threshold3
+	       larger -> stronger filtering
+
+       al/autolevels[:f/fullyrange], automatic brightness / contrast
+       correction
+	   f/fullyrange
+	       Stretch luma to "0-255".
+
+       lb/linblenddeint
+	   Linear blend deinterlacing filter that deinterlaces the given block
+	   by filtering all lines with a "(1 2 1)" filter.
+
+       li/linipoldeint
+	   Linear interpolating deinterlacing filter that deinterlaces the
+	   given block by linearly interpolating every second line.
+
+       ci/cubicipoldeint
+	   Cubic interpolating deinterlacing filter deinterlaces the given
+	   block by cubically interpolating every second line.
+
+       md/mediandeint
+	   Median deinterlacing filter that deinterlaces the given block by
+	   applying a median filter to every second line.
+
+       fd/ffmpegdeint
+	   FFmpeg deinterlacing filter that deinterlaces the given block by
+	   filtering every second line with a "(-1 4 2 4 -1)" filter.
+
+       l5/lowpass5
+	   Vertically applied FIR lowpass deinterlacing filter that
+	   deinterlaces the given block by filtering all lines with a "(-1 2 6
+	   2 -1)" filter.
+
+       fq/forceQuant[|quantizer]
+	   Overrides the quantizer table from the input with the constant
+	   quantizer you specify.
+
+	   quantizer
+	       Quantizer to use
+
+       de/default
+	   Default pp filter combination ("hb|a,vb|a,dr|a")
+
+       fa/fast
+	   Fast pp filter combination ("h1|a,v1|a,dr|a")
+
+       ac  High quality pp filter combination ("ha|a|128|7,va|a,dr|a")
+
+       Examples
+
+       o   Apply horizontal and vertical deblocking, deringing and automatic
+	   brightness/contrast:
+
+		   pp=hb/vb/dr/al
+
+       o   Apply default filters without brightness/contrast correction:
+
+		   pp=de/-al
+
+       o   Apply default filters and temporal denoiser:
+
+		   pp=default/tmpnoise|1|2|3
+
+       o   Apply deblocking on luma only, and switch vertical deblocking on or
+	   off automatically depending on available CPU time:
+
+		   pp=hb|y/vb|a
+
+   pp7
+       Apply Postprocessing filter 7. It is variant of the spp filter, similar
+       to spp = 6 with 7 point DCT, where only the center sample is used after
+       IDCT.
+
+       The filter accepts the following options:
+
+       qp  Force a constant quantization parameter. It accepts an integer in
+	   range 0 to 63. If not set, the filter will use the QP from the
+	   video stream (if available).
+
+       mode
+	   Set thresholding mode. Available modes are:
+
+	   hard
+	       Set hard thresholding.
+
+	   soft
+	       Set soft thresholding (better de-ringing effect, but likely
+	       blurrier).
+
+	   medium
+	       Set medium thresholding (good results, default).
+
+   premultiply
+       Apply alpha premultiply effect to input video stream using first plane
+       of second stream as alpha.
+
+       Both streams must have same dimensions and same pixel format.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       inplace
+	   Do not require 2nd input for processing, instead use alpha plane
+	   from input stream.
+
+   prewitt
+       Apply prewitt operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   pseudocolor
+       Alter frame colors in video with pseudocolors.
+
+       This filter accepts the following options:
+
+       c0  set pixel first component expression
+
+       c1  set pixel second component expression
+
+       c2  set pixel third component expression
+
+       c3  set pixel fourth component expression, corresponds to the alpha
+	   component
+
+       index, i
+	   set component to use as base for altering colors
+
+       preset, p
+	   Pick one of built-in LUTs. By default is set to none.
+
+	   Available LUTs:
+
+	   magma
+	   inferno
+	   plasma
+	   viridis
+	   turbo
+	   cividis
+	   range1
+	   range2
+	   shadows
+	   highlights
+	   solar
+	   nominal
+	   preferred
+	   total
+	   spectral
+	   cool
+	   heat
+	   fiery
+	   blues
+	   green
+	   helix
+       opacity
+	   Set opacity of output colors. Allowed range is from 0 to 1.
+	   Default value is set to 1.
+
+       Each of the expression options specifies the expression to use for
+       computing the lookup table for the corresponding pixel component
+       values.
+
+       The expressions can contain the following constants and functions:
+
+       w
+       h   The input width and height.
+
+       val The input value for the pixel component.
+
+       ymin, umin, vmin, amin
+	   The minimum allowed component value.
+
+       ymax, umax, vmax, amax
+	   The maximum allowed component value.
+
+       All expressions default to "val".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Change too high luma values to gradient:
+
+		   pseudocolor="'if(between(val,ymax,amax),lerp(ymin,ymax,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(umax,umin,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(vmin,vmax,(val-ymax)/(amax-ymax)),-1):-1'"
+
+   psnr
+       Obtain the average, maximum and minimum PSNR (Peak Signal to Noise
+       Ratio) between two input videos.
+
+       This filter takes in input two input videos, the first input is
+       considered the "main" source and is passed unchanged to the output. The
+       second input is used as a "reference" video for computing the PSNR.
+
+       Both video inputs must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained average PSNR is printed through the logging system.
+
+       The filter stores the accumulated MSE (mean squared error) of each
+       frame, and at the end of the processing it is averaged across all
+       frames equally, and the following formula is applied to obtain the
+       PSNR:
+
+	       PSNR = 10*log10(MAX^2/MSE)
+
+       Where MAX is the average of the maximum values of each component of the
+       image.
+
+       The description of the accepted parameters follows.
+
+       stats_file, f
+	   If specified the filter will use the named file to save the PSNR of
+	   each individual frame. When filename equals "-" the data is sent to
+	   standard output.
+
+       stats_version
+	   Specifies which version of the stats file format to use. Details of
+	   each format are written below.  Default value is 1.
+
+       stats_add_max
+	   Determines whether the max value is output to the stats log.
+	   Default value is 0.	Requires stats_version >= 2. If this is set
+	   and stats_version < 2, the filter will return an error.
+
+       This filter also supports the framesync options.
+
+       The file printed if stats_file is selected, contains a sequence of
+       key/value pairs of the form key:value for each compared couple of
+       frames.
+
+       If a stats_version greater than 1 is specified, a header line precedes
+       the list of per-frame-pair stats, with key value pairs following the
+       frame format with the following parameters:
+
+       psnr_log_version
+	   The version of the log file format. Will match stats_version.
+
+       fields
+	   A comma separated list of the per-frame-pair parameters included in
+	   the log.
+
+       A description of each shown per-frame-pair parameter follows:
+
+       n   sequential number of the input frame, starting from 1
+
+       mse_avg
+	   Mean Square Error pixel-by-pixel average difference of the compared
+	   frames, averaged over all the image components.
+
+       mse_y, mse_u, mse_v, mse_r, mse_g, mse_b, mse_a
+	   Mean Square Error pixel-by-pixel average difference of the compared
+	   frames for the component specified by the suffix.
+
+       psnr_y, psnr_u, psnr_v, psnr_r, psnr_g, psnr_b, psnr_a
+	   Peak Signal to Noise ratio of the compared frames for the component
+	   specified by the suffix.
+
+       max_avg, max_y, max_u, max_v
+	   Maximum allowed value for each channel, and average over all
+	   channels.
+
+       Examples
+
+       o   For example:
+
+		   movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
+		   [main][ref] psnr="stats_file=stats.log" [out]
+
+	   On this example the input file being processed is compared with the
+	   reference file ref_movie.mpg. The PSNR of each individual frame is
+	   stored in stats.log.
+
+       o   Another example with different containers:
+
+		   ffmpeg -i main.mpg -i ref.mkv -lavfi  "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]psnr" -f null -
+
+   pullup
+       Pulldown reversal (inverse telecine) filter, capable of handling mixed
+       hard-telecine, 24000/1001 fps progressive, and 30000/1001 fps
+       progressive content.
+
+       The pullup filter is designed to take advantage of future context in
+       making its decisions. This filter is stateless in the sense that it
+       does not lock onto a pattern to follow, but it instead looks forward to
+       the following fields in order to identify matches and rebuild
+       progressive frames.
+
+       To produce content with an even framerate, insert the fps filter after
+       pullup, use "fps=24000/1001" if the input frame rate is 29.97fps,
+       "fps=24" for 30fps and the (rare) telecined 25fps input.
+
+       The filter accepts the following options:
+
+       jl
+       jr
+       jt
+       jb  These options set the amount of "junk" to ignore at the left,
+	   right, top, and bottom of the image, respectively. Left and right
+	   are in units of 8 pixels, while top and bottom are in units of 2
+	   lines.  The default is 8 pixels on each side.
+
+       sb  Set the strict breaks. Setting this option to 1 will reduce the
+	   chances of filter generating an occasional mismatched frame, but it
+	   may also cause an excessive number of frames to be dropped during
+	   high motion sequences.  Conversely, setting it to -1 will make
+	   filter match fields more easily.  This may help processing of video
+	   where there is slight blurring between the fields, but may also
+	   cause there to be interlaced frames in the output.  Default value
+	   is 0.
+
+       mp  Set the metric plane to use. It accepts the following values:
+
+	   l   Use luma plane.
+
+	   u   Use chroma blue plane.
+
+	   v   Use chroma red plane.
+
+	   This option may be set to use chroma plane instead of the default
+	   luma plane for doing filter's computations. This may improve
+	   accuracy on very clean source material, but more likely will
+	   decrease accuracy, especially if there is chroma noise (rainbow
+	   effect) or any grayscale video.  The main purpose of setting mp to
+	   a chroma plane is to reduce CPU load and make pullup usable in
+	   realtime on slow machines.
+
+       For best results (without duplicated frames in the output file) it is
+       necessary to change the output frame rate. For example, to inverse
+       telecine NTSC input:
+
+	       ffmpeg -i input -vf pullup -r 24000/1001 ...
+
+   qp
+       Change video quantization parameters (QP).
+
+       The filter accepts the following option:
+
+       qp  Set expression for quantization parameter.
+
+       The expression is evaluated through the eval API and can contain, among
+       others, the following constants:
+
+       known
+	   1 if index is not 129, 0 otherwise.
+
+       qp  Sequential index starting from -129 to 128.
+
+       Examples
+
+       o   Some equation like:
+
+		   qp=2+2*sin(PI*qp)
+
+   qrencode
+       Generate a QR code using the libqrencode library (see
+       <https://fukuchi.org/works/qrencode/>), and overlay it on top of the
+       current frame.
+
+       To enable the compilation of this filter, you need to configure FFmpeg
+       with "--enable-libqrencode".
+
+       The QR code is generated from the provided text or text pattern. The
+       corresponding QR code is scaled and overlayed into the video output
+       according to the specified options.
+
+       In case no text is specified, no QR code is overlaied.
+
+       This filter accepts the following options:
+
+       qrcode_width, q
+       padded_qrcode_width, Q
+	   Specify an expression for the width of the rendered QR code, with
+	   and without padding. The qrcode_width expression can reference the
+	   value set by the padded_qrcode_width expression, and vice versa.
+	   By default padded_qrcode_width is set to qrcode_width, meaning that
+	   there is no padding.
+
+	   These expressions are evaluated for each new frame.
+
+	   See the qrencode Expressions section for details.
+
+       x
+       y   Specify an expression for positioning the padded QR code top-left
+	   corner.  The x expression can reference the value set by the y
+	   expression, and vice.
+
+	   By default x and y are set set to 0, meaning that the QR code is
+	   placed in the top left corner of the input.
+
+	   These expressions are evaluated for each new frame.
+
+	   See the qrencode Expressions section for details.
+
+       case_sensitive, cs
+	   Instruct libqrencode to use case sensitive encoding. This is
+	   enabled by default. This can be disabled to reduce the QR encoding
+	   size.
+
+       level, l
+	   Specify the QR encoding error correction level. With an higher
+	   correction level, the encoding size will increase but the code will
+	   be more robust to corruption.  Lower level is L.
+
+	   It accepts the following values:
+
+	   L
+	   M
+	   Q
+	   H
+       expansion
+	   Select how the input text is expanded. Can be either "none", or
+	   "normal" (default). See the qrencode Text expansion section below
+	   for details.
+
+       text
+       textfile
+	   Define the text to be rendered. In case neither is specified, no QR
+	   is encoded (just an empty colored frame).
+
+	   In case expansion is enabled, the text is treated as a text
+	   template, using the qrencode expansion mechanism. See the qrencode
+	   Text expansion section below for details.
+
+       background_color, bc
+       foreground_color, fc
+	   Set the QR code and background color. The default value of
+	   foreground_color is "black", the default value of background_color
+	   is "white".
+
+	   For the syntax of the color options, check the "Color" section in
+	   the ffmpeg-utils manual.
+
+       qrencode Expressions
+
+       The expressions set by the options contain the following constants and
+       functions.
+
+       dar input display aspect ratio, it is the same as (w / h) * sar
+
+       duration
+	   the current frame's duration, in seconds
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       main_h, H
+	   the input height
+
+       main_w, W
+	   the input width
+
+       n   the number of input frame, starting from 0
+
+       pict_type
+	   a number representing the picture type
+
+       qr_w, w
+	   the width of the encoded QR code
+
+       rendered_qr_w, q
+       rendered_padded_qr_w, Q
+	   the width of the rendered QR code, without and without padding.
+
+	   These parameters allow the q and Q expressions to refer to each
+	   other, so you can for example specify "q=3/4*Q".
+
+       rand(min, max)
+	   return a random number included between min and max
+
+       sar the input sample aspect ratio
+
+       t   timestamp expressed in seconds, NAN if the input timestamp is
+	   unknown
+
+       x
+       y   the x and y offset coordinates where the text is drawn.
+
+	   These parameters allow the x and y expressions to refer to each
+	   other, so you can for example specify "y=x/dar".
+
+       qrencode Text expansion
+
+       If expansion is set to "none", the text is printed verbatim.
+
+       If expansion is set to "normal" (which is the default), the following
+       expansion mechanism is used.
+
+       The backslash character \, followed by any character, always expands to
+       the second character.
+
+       Sequences of the form "%{...}" are expanded. The text between the
+       braces is a function name, possibly followed by arguments separated by
+       ':'.  If the arguments contain special characters or delimiters (':' or
+       '}'), they should be escaped.
+
+       Note that they probably must also be escaped as the value for the text
+       option in the filter argument string and as the filter argument in the
+       filtergraph description, and possibly also for the shell, that makes up
+       to four levels of escaping; using a text file with the textfile option
+       avoids these problems.
+
+       The following functions are available:
+
+       n, frame_num
+	   return the frame number
+
+       pts Return the presentation timestamp of the current frame.
+
+	   It can take up to two arguments.
+
+	   The first argument is the format of the timestamp; it defaults to
+	   "flt" for seconds as a decimal number with microsecond accuracy;
+	   "hms" stands for a formatted [-]HH:MM:SS.mmm timestamp with
+	   millisecond accuracy.  "gmtime" stands for the timestamp of the
+	   frame formatted as UTC time; "localtime" stands for the timestamp
+	   of the frame formatted as local time zone time. If the format is
+	   set to "hms24hh", the time is formatted in 24h format (00-23).
+
+	   The second argument is an offset added to the timestamp.
+
+	   If the format is set to "localtime" or "gmtime", a third argument
+	   may be supplied: a "strftime" C function format string. By default,
+	   YYYY-MM-DD HH:MM:SS format will be used.
+
+       expr, e
+	   Evaluate the expression's value and output as a double.
+
+	   It must take one argument specifying the expression to be
+	   evaluated, accepting the constants and functions defined in
+	   qrencode_expressions.
+
+       expr_formatted, ef
+	   Evaluate the expression's value and output as a formatted string.
+
+	   The first argument is the expression to be evaluated, just as for
+	   the expr function.  The second argument specifies the output
+	   format. Allowed values are x, X, d and u. They are treated exactly
+	   as in the "printf" function.  The third parameter is optional and
+	   sets the number of positions taken by the output.  It can be used
+	   to add padding with zeros from the left.
+
+       gmtime
+	   The time at which the filter is running, expressed in UTC.  It can
+	   accept an argument: a "strftime" C function format string.  The
+	   format string is extended to support the variable %[1-6]N which
+	   prints fractions of the second with optionally specified number of
+	   digits.
+
+       localtime
+	   The time at which the filter is running, expressed in the local
+	   time zone.  It can accept an argument: a "strftime" C function
+	   format string.  The format string is extended to support the
+	   variable %[1-6]N which prints fractions of the second with
+	   optionally specified number of digits.
+
+       metadata
+	   Frame metadata. Takes one or two arguments.
+
+	   The first argument is mandatory and specifies the metadata key.
+
+	   The second argument is optional and specifies a default value, used
+	   when the metadata key is not found or empty.
+
+	   Available metadata can be identified by inspecting entries starting
+	   with TAG included within each frame section printed by running
+	   "ffprobe -show_frames".
+
+	   String metadata generated in filters leading to the qrencode filter
+	   are also available.
+
+       rand(min, max)
+	   return a random number included between min and max
+
+       Examples
+
+       o   Generate a QR code encoding the specified text with the default
+	   size, overalaid in the top left corner of the input video, with the
+	   default size:
+
+		   qrencode=text=www.ffmpeg.org
+
+       o   Same as below, but select blue on pink colors:
+
+		   qrencode=text=www.ffmpeg.org:bc=pink@0.5:fc=blue
+
+       o   Place the QR code in the bottom right corner of the input video:
+
+		   qrencode=text=www.ffmpeg.org:x=W-Q:y=H-Q
+
+       o   Generate a QR code with width of 200 pixels and padding, making the
+	   padded width 4/3 of the QR code width:
+
+		   qrencode=text=www.ffmpeg.org:q=200:Q=4/3*q
+
+       o   Generate a QR code with padded width of 200 pixels and padding,
+	   making the QR code width 3/4 of the padded width:
+
+		   qrencode=text=www.ffmpeg.org:Q=200:q=3/4*Q
+
+       o   Make the QR code a fraction of the input video width:
+
+		   qrencode=text=www.ffmpeg.org:q=W/5
+
+       o   Generate a QR code encoding the frame number:
+
+		   qrencode=text=%{n}
+
+       o   Generate a QR code encoding the GMT timestamp:
+
+		   qrencode=text=%{gmtime}
+
+       o   Generate a QR code encoding the timestamp expressed as a float:
+
+		   qrencode=text=%{pts}
+
+   quirc
+       Identify and decode a QR code using the libquirc library (see
+       <https://github.com/dlbeer/quirc/>), and print the identified QR codes
+       positions and payload as metadata.
+
+       To enable the compilation of this filter, you need to configure FFmpeg
+       with "--enable-libquirc".
+
+       For each found QR code in the input video, some metadata entries are
+       added with the prefix lavfi.quirc.N, where N is the index, starting
+       from 0, associated to the QR code.
+
+       A description of each metadata value follows:
+
+       lavfi.quirc.count
+	   the number of found QR codes, it is not set in case none was found
+
+       lavfi.quirc.N.corner.M.x
+       lavfi.quirc.N.coreer.M.y
+	   the x/y positions of the four corners of the square containing the
+	   QR code, where M is the index of the corner starting from 0
+
+       lavfi.quirc.N.payload
+	   the payload of the QR code
+
+   random
+       Flush video frames from internal cache of frames into a random order.
+       No frame is discarded.  Inspired by frei0r nervous filter.
+
+       frames
+	   Set size in number of frames of internal cache, in range from 2 to
+	   512. Default is 30.
+
+       seed
+	   Set seed for random number generator, must be an integer included
+	   between 0 and "UINT32_MAX". If not specified, or if explicitly set
+	   to less than 0, the filter will try to use a good random seed on a
+	   best effort basis.
+
+   readeia608
+       Read closed captioning (EIA-608) information from the top lines of a
+       video frame.
+
+       This filter adds frame metadata for "lavfi.readeia608.X.cc" and
+       "lavfi.readeia608.X.line", where "X" is the number of the identified
+       line with EIA-608 data (starting from 0). A description of each
+       metadata value follows:
+
+       lavfi.readeia608.X.cc
+	   The two bytes stored as EIA-608 data (printed in hexadecimal).
+
+       lavfi.readeia608.X.line
+	   The number of the line on which the EIA-608 data was identified and
+	   read.
+
+       This filter accepts the following options:
+
+       scan_min
+	   Set the line to start scanning for EIA-608 data. Default is 0.
+
+       scan_max
+	   Set the line to end scanning for EIA-608 data. Default is 29.
+
+       spw Set the ratio of width reserved for sync code detection.  Default
+	   is 0.27. Allowed range is "[0.1 - 0.7]".
+
+       chp Enable checking the parity bit. In the event of a parity error, the
+	   filter will output 0x00 for that character. Default is false.
+
+       lp  Lowpass lines prior to further processing. Default is enabled.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+       Examples
+
+       o   Output a csv with presentation time and the first two lines of
+	   identified EIA-608 captioning data.
+
+		   ffprobe -f lavfi -i movie=captioned_video.mov,readeia608 -show_entries frame=pts_time:frame_tags=lavfi.readeia608.0.cc,lavfi.readeia608.1.cc -of csv
+
+   readvitc
+       Read vertical interval timecode (VITC) information from the top lines
+       of a video frame.
+
+       The filter adds frame metadata key "lavfi.readvitc.tc_str" with the
+       timecode value, if a valid timecode has been detected. Further metadata
+       key "lavfi.readvitc.found" is set to 0/1 depending on whether timecode
+       data has been found or not.
+
+       This filter accepts the following options:
+
+       scan_max
+	   Set the maximum number of lines to scan for VITC data. If the value
+	   is set to "-1" the full video frame is scanned. Default is 45.
+
+       thr_b
+	   Set the luma threshold for black. Accepts float numbers in the
+	   range [0.0,1.0], default value is 0.2. The value must be equal or
+	   less than "thr_w".
+
+       thr_w
+	   Set the luma threshold for white. Accepts float numbers in the
+	   range [0.0,1.0], default value is 0.6. The value must be equal or
+	   greater than "thr_b".
+
+       Examples
+
+       o   Detect and draw VITC data onto the video frame; if no valid VITC is
+	   detected, draw "--:--:--:--" as a placeholder:
+
+		   ffmpeg -i input.avi -filter:v 'readvitc,drawtext=fontfile=FreeMono.ttf:text=%{metadata\\:lavfi.readvitc.tc_str\\:--\\\\\\:--\\\\\\:--\\\\\\:--}:x=(w-tw)/2:y=400-ascent'
+
+   remap
+       Remap pixels using 2nd: Xmap and 3rd: Ymap input video stream.
+
+       Destination pixel at position (X, Y) will be picked from source (x, y)
+       position where x = Xmap(X, Y) and y = Ymap(X, Y). If mapping values are
+       out of range, zero value for pixel will be used for destination pixel.
+
+       Xmap and Ymap input video streams must be of same dimensions. Output
+       video stream will have Xmap/Ymap video stream dimensions.  Xmap and
+       Ymap input video streams are 16bit depth, single channel.
+
+       format
+	   Specify pixel format of output from this filter. Can be "color" or
+	   "gray".  Default is "color".
+
+       fill
+	   Specify the color of the unmapped pixels. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+	   Default color is "black".
+
+   removegrain
+       The removegrain filter is a spatial denoiser for progressive video.
+
+       m0  Set mode for the first plane.
+
+       m1  Set mode for the second plane.
+
+       m2  Set mode for the third plane.
+
+       m3  Set mode for the fourth plane.
+
+       Range of mode is from 0 to 24. Description of each mode follows:
+
+       0   Leave input plane unchanged. Default.
+
+       1   Clips the pixel with the minimum and maximum of the 8 neighbour
+	   pixels.
+
+       2   Clips the pixel with the second minimum and maximum of the 8
+	   neighbour pixels.
+
+       3   Clips the pixel with the third minimum and maximum of the 8
+	   neighbour pixels.
+
+       4   Clips the pixel with the fourth minimum and maximum of the 8
+	   neighbour pixels.  This is equivalent to a median filter.
+
+       5   Line-sensitive clipping giving the minimal change.
+
+       6   Line-sensitive clipping, intermediate.
+
+       7   Line-sensitive clipping, intermediate.
+
+       8   Line-sensitive clipping, intermediate.
+
+       9   Line-sensitive clipping on a line where the neighbours pixels are
+	   the closest.
+
+       10  Replaces the target pixel with the closest neighbour.
+
+       11  [1 2 1] horizontal and vertical kernel blur.
+
+       12  Same as mode 11.
+
+       13  Bob mode, interpolates top field from the line where the neighbours
+	   pixels are the closest.
+
+       14  Bob mode, interpolates bottom field from the line where the
+	   neighbours pixels are the closest.
+
+       15  Bob mode, interpolates top field. Same as 13 but with a more
+	   complicated interpolation formula.
+
+       16  Bob mode, interpolates bottom field. Same as 14 but with a more
+	   complicated interpolation formula.
+
+       17  Clips the pixel with the minimum and maximum of respectively the
+	   maximum and minimum of each pair of opposite neighbour pixels.
+
+       18  Line-sensitive clipping using opposite neighbours whose greatest
+	   distance from the current pixel is minimal.
+
+       19  Replaces the pixel with the average of its 8 neighbours.
+
+       20  Averages the 9 pixels ([1 1 1] horizontal and vertical blur).
+
+       21  Clips pixels using the averages of opposite neighbour.
+
+       22  Same as mode 21 but simpler and faster.
+
+       23  Small edge and halo removal, but reputed useless.
+
+       24  Similar as 23.
+
+   removelogo
+       Suppress a TV station logo, using an image file to determine which
+       pixels comprise the logo. It works by filling in the pixels that
+       comprise the logo with neighboring pixels.
+
+       The filter accepts the following options:
+
+       filename, f
+	   Set the filter bitmap file, which can be any image format supported
+	   by libavformat. The width and height of the image file must match
+	   those of the video stream being processed.
+
+       Pixels in the provided bitmap image with a value of zero are not
+       considered part of the logo, non-zero pixels are considered part of the
+       logo. If you use white (255) for the logo and black (0) for the rest,
+       you will be safe. For making the filter bitmap, it is recommended to
+       take a screen capture of a black frame with the logo visible, and then
+       using a threshold filter followed by the erode filter once or twice.
+
+       If needed, little splotches can be fixed manually. Remember that if
+       logo pixels are not covered, the filter quality will be much reduced.
+       Marking too many pixels as part of the logo does not hurt as much, but
+       it will increase the amount of blurring needed to cover over the image
+       and will destroy more information than necessary, and extra pixels will
+       slow things down on a large logo.
+
+   repeatfields
+       This filter uses the repeat_field flag from the Video ES headers and
+       hard repeats fields based on its value.
+
+   reverse
+       Reverse a video clip.
+
+       Warning: This filter requires memory to buffer the entire clip, so
+       trimming is suggested.
+
+       Examples
+
+       o   Take the first 5 seconds of a clip, and reverse it.
+
+		   trim=end=5,reverse
+
+   rgbashift
+       Shift R/G/B/A pixels horizontally and/or vertically.
+
+       The filter accepts the following options:
+
+       rh  Set amount to shift red horizontally.
+
+       rv  Set amount to shift red vertically.
+
+       gh  Set amount to shift green horizontally.
+
+       gv  Set amount to shift green vertically.
+
+       bh  Set amount to shift blue horizontally.
+
+       bv  Set amount to shift blue vertically.
+
+       ah  Set amount to shift alpha horizontally.
+
+       av  Set amount to shift alpha vertically.
+
+       edge
+	   Set edge mode, can be smear, default, or warp.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   roberts
+       Apply roberts cross operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   rotate
+       Rotate video by an arbitrary angle expressed in radians.
+
+       The filter accepts the following options:
+
+       A description of the optional parameters follows.
+
+       angle, a
+	   Set an expression for the angle by which to rotate the input video
+	   clockwise, expressed as a number of radians. A negative value will
+	   result in a counter-clockwise rotation. By default it is set to
+	   "0".
+
+	   This expression is evaluated for each frame.
+
+       out_w, ow
+	   Set the output width expression, default value is "iw".  This
+	   expression is evaluated just once during configuration.
+
+       out_h, oh
+	   Set the output height expression, default value is "ih".  This
+	   expression is evaluated just once during configuration.
+
+       bilinear
+	   Enable bilinear interpolation if set to 1, a value of 0 disables
+	   it. Default value is 1.
+
+       fillcolor, c
+	   Set the color used to fill the output area not covered by the
+	   rotated image. For the general syntax of this option, check the
+	   "Color" section in the ffmpeg-utils manual.	If the special value
+	   "none" is selected then no background is printed (useful for
+	   example if the background is never shown).
+
+	   Default value is "black".
+
+       The expressions for the angle and the output size can contain the
+       following constants and functions:
+
+       n   sequential number of the input frame, starting from 0. It is always
+	   NAN before the first frame is filtered.
+
+       t   time in seconds of the input frame, it is set to 0 when the filter
+	   is configured. It is always NAN before the first frame is filtered.
+
+       hsub
+       vsub
+	   horizontal and vertical chroma subsample values. For example for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       in_w, iw
+       in_h, ih
+	   the input video width and height
+
+       out_w, ow
+       out_h, oh
+	   the output width and height, that is the size of the padded area as
+	   specified by the width and height expressions
+
+       rotw(a)
+       roth(a)
+	   the minimal width/height required for completely containing the
+	   input video rotated by a radians.
+
+	   These are only available when computing the out_w and out_h
+	   expressions.
+
+       Examples
+
+       o   Rotate the input by PI/6 radians clockwise:
+
+		   rotate=PI/6
+
+       o   Rotate the input by PI/6 radians counter-clockwise:
+
+		   rotate=-PI/6
+
+       o   Rotate the input by 45 degrees clockwise:
+
+		   rotate=45*PI/180
+
+       o   Apply a constant rotation with period T, starting from an angle of
+	   PI/3:
+
+		   rotate=PI/3+2*PI*t/T
+
+       o   Make the input video rotation oscillating with a period of T
+	   seconds and an amplitude of A radians:
+
+		   rotate=A*sin(2*PI/T*t)
+
+       o   Rotate the video, output size is chosen so that the whole rotating
+	   input video is always completely contained in the output:
+
+		   rotate='2*PI*t:ow=hypot(iw,ih):oh=ow'
+
+       o   Rotate the video, reduce the output size so that no background is
+	   ever shown:
+
+		   rotate=2*PI*t:ow='min(iw,ih)/sqrt(2)':oh=ow:c=none
+
+       Commands
+
+       The filter supports the following commands:
+
+       a, angle
+	   Set the angle expression.  The command accepts the same syntax of
+	   the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   sab
+       Apply Shape Adaptive Blur.
+
+       The filter accepts the following options:
+
+       luma_radius, lr
+	   Set luma blur filter strength, must be a value in range 0.1-4.0,
+	   default value is 1.0. A greater value will result in a more blurred
+	   image, and in slower processing.
+
+       luma_pre_filter_radius, lpfr
+	   Set luma pre-filter radius, must be a value in the 0.1-2.0 range,
+	   default value is 1.0.
+
+       luma_strength, ls
+	   Set luma maximum difference between pixels to still be considered,
+	   must be a value in the 0.1-100.0 range, default value is 1.0.
+
+       chroma_radius, cr
+	   Set chroma blur filter strength, must be a value in range -0.9-4.0.
+	   A greater value will result in a more blurred image, and in slower
+	   processing.
+
+       chroma_pre_filter_radius, cpfr
+	   Set chroma pre-filter radius, must be a value in the -0.9-2.0
+	   range.
+
+       chroma_strength, cs
+	   Set chroma maximum difference between pixels to still be
+	   considered, must be a value in the -0.9-100.0 range.
+
+       Each chroma option value, if not explicitly specified, is set to the
+       corresponding luma option value.
+
+   scale
+       Scale (resize) the input video, using the libswscale library.
+
+       The scale filter forces the output display aspect ratio to be the same
+       of the input, by changing the output sample aspect ratio.
+
+       If the input image format is different from the format requested by the
+       next filter, the scale filter will convert the input to the requested
+       format.
+
+       Options
+
+       The filter accepts the following options, or any of the options
+       supported by the libswscale scaler.
+
+       See the ffmpeg-scaler manual for the complete list of scaler options.
+
+       width, w
+       height, h
+	   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+	   If the width or w value is 0, the input width is used for the
+	   output. If the height or h value is 0, the input height is used for
+	   the output.
+
+	   If one and only one of the values is -n with n >= 1, the scale
+	   filter will use a value that maintains the aspect ratio of the
+	   input image, calculated from the other specified dimension. After
+	   that it will, however, make sure that the calculated dimension is
+	   divisible by n and adjust the value if necessary.
+
+	   If both values are -n with n >= 1, the behavior will be identical
+	   to both values being set to 0 as previously detailed.
+
+	   See below for the list of accepted constants for use in the
+	   dimension expression.
+
+       eval
+	   Specify when to evaluate width and height expression. It accepts
+	   the following values:
+
+	   init
+	       Only evaluate expressions once during the filter initialization
+	       or when a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+	   Default value is init.
+
+       interl
+	   Set the interlacing mode. It accepts the following values:
+
+	   1   Force interlaced aware scaling.
+
+	   0   Do not apply interlaced scaling.
+
+	   -1  Select interlaced aware scaling depending on whether the source
+	       frames are flagged as interlaced or not.
+
+	   Default value is 0.
+
+       flags
+	   Set libswscale scaling flags. See the ffmpeg-scaler manual for the
+	   complete list of values. If not explicitly specified the filter
+	   applies the default flags.
+
+       param0, param1
+	   Set libswscale input parameters for scaling algorithms that need
+	   them. See the ffmpeg-scaler manual for the complete documentation.
+	   If not explicitly specified the filter applies empty parameters.
+
+       size, s
+	   Set the video size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual.
+
+       in_color_matrix
+       out_color_matrix
+	   Set in/output YCbCr color space type.
+
+	   This allows the autodetected value to be overridden as well as
+	   allows forcing a specific value used for the output and encoder.
+
+	   If not specified, the color space type depends on the pixel format.
+
+	   Possible values:
+
+	   auto
+	       Choose automatically.
+
+	   bt709
+	       Format conforming to International Telecommunication Union
+	       (ITU) Recommendation BT.709.
+
+	   fcc Set color space conforming to the United States Federal
+	       Communications Commission (FCC) Code of Federal Regulations
+	       (CFR) Title 47 (2003) 73.682 (a).
+
+	   bt601
+	   bt470
+	   smpte170m
+	       Set color space conforming to:
+
+	       o   ITU Radiocommunication Sector (ITU-R) Recommendation BT.601
+
+	       o   ITU-R Rec. BT.470-6 (1998) Systems B, B1, and G
+
+	       o   Society of Motion Picture and Television Engineers (SMPTE)
+		   ST 170:2004
+
+	   smpte240m
+	       Set color space conforming to SMPTE ST 240:1999.
+
+	   bt2020
+	       Set color space conforming to ITU-R BT.2020 non-constant
+	       luminance system.
+
+       in_range
+       out_range
+	   Set in/output YCbCr sample range.
+
+	   This allows the autodetected value to be overridden as well as
+	   allows forcing a specific value used for the output and encoder. If
+	   not specified, the range depends on the pixel format. Possible
+	   values:
+
+	   auto/unknown
+	       Choose automatically.
+
+	   jpeg/full/pc
+	       Set full range (0-255 in case of 8-bit luma).
+
+	   mpeg/limited/tv
+	       Set "MPEG" range (16-235 in case of 8-bit luma).
+
+       force_original_aspect_ratio
+	   Enable decreasing or increasing output video width or height if
+	   necessary to keep the original aspect ratio. Possible values:
+
+	   disable
+	       Scale the video as specified and disable this feature.
+
+	   decrease
+	       The output video dimensions will automatically be decreased if
+	       needed.
+
+	   increase
+	       The output video dimensions will automatically be increased if
+	       needed.
+
+	   One useful instance of this option is that when you know a specific
+	   device's maximum allowed resolution, you can use this to limit the
+	   output video to that, while retaining the aspect ratio. For
+	   example, device A allows 1280x720 playback, and your video is
+	   1920x800. Using this option (set it to decrease) and specifying
+	   1280x720 to the command line makes the output 1280x533.
+
+	   Please note that this is a different thing than specifying -1 for w
+	   or h, you still need to specify the output resolution for this
+	   option to work.
+
+       force_divisible_by
+	   Ensures that both the output dimensions, width and height, are
+	   divisible by the given integer when used together with
+	   force_original_aspect_ratio. This works similar to using "-n" in
+	   the w and h options.
+
+	   This option respects the value set for force_original_aspect_ratio,
+	   increasing or decreasing the resolution accordingly. The video's
+	   aspect ratio may be slightly modified.
+
+	   This option can be handy if you need to have a video fit within or
+	   exceed a defined resolution using force_original_aspect_ratio but
+	   also have encoder restrictions on width or height divisibility.
+
+       The values of the w and h options are expressions containing the
+       following constants:
+
+       in_w
+       in_h
+	   The input width and height
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (scaled) width and height
+
+       ow
+       oh  These are the same as out_w and out_h
+
+       a   The same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar The input display aspect ratio. Calculated from "(iw / ih) * sar".
+
+       hsub
+       vsub
+	   horizontal and vertical input chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       ohsub
+       ovsub
+	   horizontal and vertical output chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       n   The (sequential) number of the input frame, starting from 0.  Only
+	   available with "eval=frame".
+
+       t   The presentation timestamp of the input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       pos The position (byte offset) of the frame in the input stream, or NaN
+	   if this information is unavailable and/or meaningless (for example
+	   in case of synthetic video).  Only available with "eval=frame".
+	   Deprecated, do not use.
+
+       Examples
+
+       o   Scale the input video to a size of 200x100
+
+		   scale=w=200:h=100
+
+	   This is equivalent to:
+
+		   scale=200:100
+
+	   or:
+
+		   scale=200x100
+
+       o   Specify a size abbreviation for the output size:
+
+		   scale=qcif
+
+	   which can also be written as:
+
+		   scale=size=qcif
+
+       o   Scale the input to 2x:
+
+		   scale=w=2*iw:h=2*ih
+
+       o   The above is the same as:
+
+		   scale=2*in_w:2*in_h
+
+       o   Scale the input to 2x with forced interlaced scaling:
+
+		   scale=2*iw:2*ih:interl=1
+
+       o   Scale the input to half size:
+
+		   scale=w=iw/2:h=ih/2
+
+       o   Increase the width, and set the height to the same size:
+
+		   scale=3/2*iw:ow
+
+       o   Seek Greek harmony:
+
+		   scale=iw:1/PHI*iw
+		   scale=ih*PHI:ih
+
+       o   Increase the height, and set the width to 3/2 of the height:
+
+		   scale=w=3/2*oh:h=3/5*ih
+
+       o   Increase the size, making the size a multiple of the chroma
+	   subsample values:
+
+		   scale="trunc(3/2*iw/hsub)*hsub:trunc(3/2*ih/vsub)*vsub"
+
+       o   Increase the width to a maximum of 500 pixels, keeping the same
+	   aspect ratio as the input:
+
+		   scale=w='min(500\, iw*3/2):h=-1'
+
+       o   Make pixels square by combining scale and setsar:
+
+		   scale='trunc(ih*dar):ih',setsar=1/1
+
+       o   Make pixels square by combining scale and setsar, making sure the
+	   resulting resolution is even (required by some codecs):
+
+		   scale='trunc(ih*dar/2)*2:trunc(ih/2)*2',setsar=1/1
+
+       Commands
+
+       This filter supports the following commands:
+
+       width, w
+       height, h
+	   Set the output video dimension expression.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   scale_cuda
+       Scale (resize) and convert (pixel format) the input video, using
+       accelerated CUDA kernels.  Setting the output width and height works in
+       the same way as for the scale filter.
+
+       The filter accepts the following options:
+
+       w
+       h   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+	   Allows for the same expressions as the scale filter.
+
+       interp_algo
+	   Sets the algorithm used for scaling:
+
+	   nearest
+	       Nearest neighbour
+
+	       Used by default if input parameters match the desired output.
+
+	   bilinear
+	       Bilinear
+
+	   bicubic
+	       Bicubic
+
+	       This is the default.
+
+	   lanczos
+	       Lanczos
+
+       format
+	   Controls the output pixel format. By default, or if none is
+	   specified, the input pixel format is used.
+
+	   The filter does not support converting between YUV and RGB pixel
+	   formats.
+
+       passthrough
+	   If set to 0, every frame is processed, even if no conversion is
+	   necessary.  This mode can be useful to use the filter as a buffer
+	   for a downstream frame-consumer that exhausts the limited decoder
+	   frame pool.
+
+	   If set to 1, frames are passed through as-is if they match the
+	   desired output parameters. This is the default behaviour.
+
+       param
+	   Algorithm-Specific parameter.
+
+	   Affects the curves of the bicubic algorithm.
+
+       force_original_aspect_ratio
+       force_divisible_by
+	   Work the same as the identical scale filter options.
+
+       Examples
+
+       o   Scale input to 720p, keeping aspect ratio and ensuring the output
+	   is yuv420p.
+
+		   scale_cuda=-2:720:format=yuv420p
+
+       o   Upscale to 4K using nearest neighbour algorithm.
+
+		   scale_cuda=4096:2160:interp_algo=nearest
+
+       o   Don't do any conversion or scaling, but copy all input frames into
+	   newly allocated ones.  This can be useful to deal with a filter and
+	   encode chain that otherwise exhausts the decoders frame pool.
+
+		   scale_cuda=passthrough=0
+
+   scale_npp
+       Use the NVIDIA Performance Primitives (libnpp) to perform scaling
+       and/or pixel format conversion on CUDA video frames. Setting the output
+       width and height works in the same way as for the scale filter.
+
+       The following additional options are accepted:
+
+       format
+	   The pixel format of the output CUDA frames. If set to the string
+	   "same" (the default), the input format will be kept. Note that
+	   automatic format negotiation and conversion is not yet supported
+	   for hardware frames
+
+       interp_algo
+	   The interpolation algorithm used for resizing. One of the
+	   following:
+
+	   nn  Nearest neighbour.
+
+	   linear
+	   cubic
+	   cubic2p_bspline
+	       2-parameter cubic (B=1, C=0)
+
+	   cubic2p_catmullrom
+	       2-parameter cubic (B=0, C=1/2)
+
+	   cubic2p_b05c03
+	       2-parameter cubic (B=1/2, C=3/10)
+
+	   super
+	       Supersampling
+
+	   lanczos
+       force_original_aspect_ratio
+	   Enable decreasing or increasing output video width or height if
+	   necessary to keep the original aspect ratio. Possible values:
+
+	   disable
+	       Scale the video as specified and disable this feature.
+
+	   decrease
+	       The output video dimensions will automatically be decreased if
+	       needed.
+
+	   increase
+	       The output video dimensions will automatically be increased if
+	       needed.
+
+	   One useful instance of this option is that when you know a specific
+	   device's maximum allowed resolution, you can use this to limit the
+	   output video to that, while retaining the aspect ratio. For
+	   example, device A allows 1280x720 playback, and your video is
+	   1920x800. Using this option (set it to decrease) and specifying
+	   1280x720 to the command line makes the output 1280x533.
+
+	   Please note that this is a different thing than specifying -1 for w
+	   or h, you still need to specify the output resolution for this
+	   option to work.
+
+       force_divisible_by
+	   Ensures that both the output dimensions, width and height, are
+	   divisible by the given integer when used together with
+	   force_original_aspect_ratio. This works similar to using "-n" in
+	   the w and h options.
+
+	   This option respects the value set for force_original_aspect_ratio,
+	   increasing or decreasing the resolution accordingly. The video's
+	   aspect ratio may be slightly modified.
+
+	   This option can be handy if you need to have a video fit within or
+	   exceed a defined resolution using force_original_aspect_ratio but
+	   also have encoder restrictions on width or height divisibility.
+
+       eval
+	   Specify when to evaluate width and height expression. It accepts
+	   the following values:
+
+	   init
+	       Only evaluate expressions once during the filter initialization
+	       or when a command is processed.
+
+	   frame
+	       Evaluate expressions for each incoming frame.
+
+       The values of the w and h options are expressions containing the
+       following constants:
+
+       in_w
+       in_h
+	   The input width and height
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (scaled) width and height
+
+       ow
+       oh  These are the same as out_w and out_h
+
+       a   The same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar The input display aspect ratio. Calculated from "(iw / ih) * sar".
+
+       n   The (sequential) number of the input frame, starting from 0.  Only
+	   available with "eval=frame".
+
+       t   The presentation timestamp of the input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       pos The position (byte offset) of the frame in the input stream, or NaN
+	   if this information is unavailable and/or meaningless (for example
+	   in case of synthetic video).  Only available with "eval=frame".
+	   Deprecated, do not use.
+
+   scale2ref
+       Scale (resize) the input video, based on a reference video.
+
+       See the scale filter for available options, scale2ref supports the same
+       but uses the reference video instead of the main input as basis.
+       scale2ref also supports the following additional constants for the w
+       and h options:
+
+       main_w
+       main_h
+	   The main input video's width and height
+
+       main_a
+	   The same as main_w / main_h
+
+       main_sar
+	   The main input video's sample aspect ratio
+
+       main_dar, mdar
+	   The main input video's display aspect ratio. Calculated from
+	   "(main_w / main_h) * main_sar".
+
+       main_hsub
+       main_vsub
+	   The main input video's horizontal and vertical chroma subsample
+	   values.  For example for the pixel format "yuv422p" hsub is 2 and
+	   vsub is 1.
+
+       main_n
+	   The (sequential) number of the main input frame, starting from 0.
+	   Only available with "eval=frame".
+
+       main_t
+	   The presentation timestamp of the main input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       main_pos
+	   The position (byte offset) of the frame in the main input stream,
+	   or NaN if this information is unavailable and/or meaningless (for
+	   example in case of synthetic video).  Only available with
+	   "eval=frame".
+
+       Examples
+
+       o   Scale a subtitle stream (b) to match the main video (a) in size
+	   before overlaying
+
+		   'scale2ref[b][a];[a][b]overlay'
+
+       o   Scale a logo to 1/10th the height of a video, while preserving its
+	   display aspect ratio.
+
+		   [logo-in][video-in]scale2ref=w=oh*mdar:h=ih/10[logo-out][video-out]
+
+       Commands
+
+       This filter supports the following commands:
+
+       width, w
+       height, h
+	   Set the output video dimension expression.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+   scale2ref_npp
+       Use the NVIDIA Performance Primitives (libnpp) to scale (resize) the
+       input video, based on a reference video.
+
+       See the scale_npp filter for available options, scale2ref_npp supports
+       the same but uses the reference video instead of the main input as
+       basis. scale2ref_npp also supports the following additional constants
+       for the w and h options:
+
+       main_w
+       main_h
+	   The main input video's width and height
+
+       main_a
+	   The same as main_w / main_h
+
+       main_sar
+	   The main input video's sample aspect ratio
+
+       main_dar, mdar
+	   The main input video's display aspect ratio. Calculated from
+	   "(main_w / main_h) * main_sar".
+
+       main_n
+	   The (sequential) number of the main input frame, starting from 0.
+	   Only available with "eval=frame".
+
+       main_t
+	   The presentation timestamp of the main input frame, expressed as a
+	   number of seconds. Only available with "eval=frame".
+
+       main_pos
+	   The position (byte offset) of the frame in the main input stream,
+	   or NaN if this information is unavailable and/or meaningless (for
+	   example in case of synthetic video).  Only available with
+	   "eval=frame".
+
+       Examples
+
+       o   Scale a subtitle stream (b) to match the main video (a) in size
+	   before overlaying
+
+		   'scale2ref_npp[b][a];[a][b]overlay_cuda'
+
+       o   Scale a logo to 1/10th the height of a video, while preserving its
+	   display aspect ratio.
+
+		   [logo-in][video-in]scale2ref_npp=w=oh*mdar:h=ih/10[logo-out][video-out]
+
+   scale_vt
+       Scale and convert the color parameters using VTPixelTransferSession.
+
+       The filter accepts the following options:
+
+       w
+       h   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+       color_matrix
+	   Set the output colorspace matrix.
+
+       color_primaries
+	   Set the output color primaries.
+
+       color_transfer
+	   Set the output transfer characteristics.
+
+   scharr
+       Apply scharr operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   scroll
+       Scroll input video horizontally and/or vertically by constant speed.
+
+       The filter accepts the following options:
+
+       horizontal, h
+	   Set the horizontal scrolling speed. Default is 0. Allowed range is
+	   from -1 to 1.  Negative values changes scrolling direction.
+
+       vertical, v
+	   Set the vertical scrolling speed. Default is 0. Allowed range is
+	   from -1 to 1.  Negative values changes scrolling direction.
+
+       hpos
+	   Set the initial horizontal scrolling position. Default is 0.
+	   Allowed range is from 0 to 1.
+
+       vpos
+	   Set the initial vertical scrolling position. Default is 0. Allowed
+	   range is from 0 to 1.
+
+       Commands
+
+       This filter supports the following commands:
+
+       horizontal, h
+	   Set the horizontal scrolling speed.
+
+       vertical, v
+	   Set the vertical scrolling speed.
+
+   scdet
+       Detect video scene change.
+
+       This filter sets frame metadata with mafd between frame, the scene
+       score, and forward the frame to the next filter, so they can use these
+       metadata to detect scene change or others.
+
+       In addition, this filter logs a message and sets frame metadata when it
+       detects a scene change by threshold.
+
+       "lavfi.scd.mafd" metadata keys are set with mafd for every frame.
+
+       "lavfi.scd.score" metadata keys are set with scene change score for
+       every frame to detect scene change.
+
+       "lavfi.scd.time" metadata keys are set with current filtered frame time
+       which detect scene change with threshold.
+
+       The filter accepts the following options:
+
+       threshold, t
+	   Set the scene change detection threshold as a percentage of maximum
+	   change. Good values are in the "[8.0, 14.0]" range. The range for
+	   threshold is "[0., 100.]".
+
+	   Default value is 10..
+
+       sc_pass, s
+	   Set the flag to pass scene change frames to the next filter.
+	   Default value is 0 You can enable it if you want to get snapshot of
+	   scene change frames only.
+
+   selectivecolor
+       Adjust cyan, magenta, yellow and black (CMYK) to certain ranges of
+       colors (such as "reds", "yellows", "greens", "cyans", ...). The
+       adjustment range is defined by the "purity" of the color (that is, how
+       saturated it already is).
+
+       This filter is similar to the Adobe Photoshop Selective Color tool.
+
+       The filter accepts the following options:
+
+       correction_method
+	   Select color correction method.
+
+	   Available values are:
+
+	   absolute
+	       Specified adjustments are applied "as-is" (added/subtracted to
+	       original pixel component value).
+
+	   relative
+	       Specified adjustments are relative to the original component
+	       value.
+
+	   Default is "absolute".
+
+       reds
+	   Adjustments for red pixels (pixels where the red component is the
+	   maximum)
+
+       yellows
+	   Adjustments for yellow pixels (pixels where the blue component is
+	   the minimum)
+
+       greens
+	   Adjustments for green pixels (pixels where the green component is
+	   the maximum)
+
+       cyans
+	   Adjustments for cyan pixels (pixels where the red component is the
+	   minimum)
+
+       blues
+	   Adjustments for blue pixels (pixels where the blue component is the
+	   maximum)
+
+       magentas
+	   Adjustments for magenta pixels (pixels where the green component is
+	   the minimum)
+
+       whites
+	   Adjustments for white pixels (pixels where all components are
+	   greater than 128)
+
+       neutrals
+	   Adjustments for all pixels except pure black and pure white
+
+       blacks
+	   Adjustments for black pixels (pixels where all components are
+	   lesser than 128)
+
+       psfile
+	   Specify a Photoshop selective color file (".asv") to import the
+	   settings from.
+
+       All the adjustment settings (reds, yellows, ...) accept up to 4 space
+       separated floating point adjustment values in the [-1,1] range,
+       respectively to adjust the amount of cyan, magenta, yellow and black
+       for the pixels of its range.
+
+       Examples
+
+       o   Increase cyan by 50% and reduce yellow by 33% in every green areas,
+	   and increase magenta by 27% in blue areas:
+
+		   selectivecolor=greens=.5 0 -.33 0:blues=0 .27
+
+       o   Use a Photoshop selective color preset:
+
+		   selectivecolor=psfile=MySelectiveColorPresets/Misty.asv
+
+   separatefields
+       The "separatefields" takes a frame-based video input and splits each
+       frame into its components fields, producing a new half height clip with
+       twice the frame rate and twice the frame count.
+
+       This filter use field-dominance information in frame to decide which of
+       each pair of fields to place first in the output.  If it gets it wrong
+       use setfield filter before "separatefields" filter.
+
+   setdar, setsar
+       The "setdar" filter sets the Display Aspect Ratio for the filter output
+       video.
+
+       This is done by changing the specified Sample (aka Pixel) Aspect Ratio,
+       according to the following equation:
+
+	       <DAR> = <HORIZONTAL_RESOLUTION> / <VERTICAL_RESOLUTION> * <SAR>
+
+       Keep in mind that the "setdar" filter does not modify the pixel
+       dimensions of the video frame. Also, the display aspect ratio set by
+       this filter may be changed by later filters in the filterchain, e.g. in
+       case of scaling or if another "setdar" or a "setsar" filter is applied.
+
+       The "setsar" filter sets the Sample (aka Pixel) Aspect Ratio for the
+       filter output video.
+
+       Note that as a consequence of the application of this filter, the
+       output display aspect ratio will change according to the equation
+       above.
+
+       Keep in mind that the sample aspect ratio set by the "setsar" filter
+       may be changed by later filters in the filterchain, e.g. if another
+       "setsar" or a "setdar" filter is applied.
+
+       It accepts the following parameters:
+
+       r, ratio, dar ("setdar" only), sar ("setsar" only)
+	   Set the aspect ratio used by the filter.
+
+	   The parameter can be a floating point number string, or an
+	   expression. If the parameter is not specified, the value "0" is
+	   assumed, meaning that the same input value is used.
+
+       max Set the maximum integer value to use for expressing numerator and
+	   denominator when reducing the expressed aspect ratio to a rational.
+	   Default value is 100.
+
+       The parameter sar is an expression containing the following constants:
+
+       w, h
+	   The input width and height.
+
+       a   Same as w / h.
+
+       sar The input sample aspect ratio.
+
+       dar The input display aspect ratio. It is the same as (w / h) * sar.
+
+       hsub, vsub
+	   Horizontal and vertical chroma subsample values. For example, for
+	   the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       Examples
+
+       o   To change the display aspect ratio to 16:9, specify one of the
+	   following:
+
+		   setdar=dar=1.77777
+		   setdar=dar=16/9
+
+       o   To change the sample aspect ratio to 10:11, specify:
+
+		   setsar=sar=10/11
+
+       o   To set a display aspect ratio of 16:9, and specify a maximum
+	   integer value of 1000 in the aspect ratio reduction, use the
+	   command:
+
+		   setdar=ratio=16/9:max=1000
+
+   setfield
+       Force field for the output video frame.
+
+       The "setfield" filter marks the interlace type field for the output
+       frames. It does not change the input frame, but only sets the
+       corresponding property, which affects how the frame is treated by
+       following filters (e.g. "fieldorder" or "yadif").
+
+       The filter accepts the following options:
+
+       mode
+	   Available values are:
+
+	   auto
+	       Keep the same field property.
+
+	   bff Mark the frame as bottom-field-first.
+
+	   tff Mark the frame as top-field-first.
+
+	   prog
+	       Mark the frame as progressive.
+
+   setparams
+       Force frame parameter for the output video frame.
+
+       The "setparams" filter marks interlace and color range for the output
+       frames. It does not change the input frame, but only sets the
+       corresponding property, which affects how the frame is treated by
+       filters/encoders.
+
+       field_mode
+	   Available values are:
+
+	   auto
+	       Keep the same field property (default).
+
+	   bff Mark the frame as bottom-field-first.
+
+	   tff Mark the frame as top-field-first.
+
+	   prog
+	       Mark the frame as progressive.
+
+       range
+	   Available values are:
+
+	   auto
+	       Keep the same color range property (default).
+
+	   unspecified, unknown
+	       Mark the frame as unspecified color range.
+
+	   limited, tv, mpeg
+	       Mark the frame as limited range.
+
+	   full, pc, jpeg
+	       Mark the frame as full range.
+
+       color_primaries
+	   Set the color primaries.  Available values are:
+
+	   auto
+	       Keep the same color primaries property (default).
+
+	   bt709
+	   unknown
+	   bt470m
+	   bt470bg
+	   smpte170m
+	   smpte240m
+	   film
+	   bt2020
+	   smpte428
+	   smpte431
+	   smpte432
+	   jedec-p22
+       color_trc
+	   Set the color transfer.  Available values are:
+
+	   auto
+	       Keep the same color trc property (default).
+
+	   bt709
+	   unknown
+	   bt470m
+	   bt470bg
+	   smpte170m
+	   smpte240m
+	   linear
+	   log100
+	   log316
+	   iec61966-2-4
+	   bt1361e
+	   iec61966-2-1
+	   bt2020-10
+	   bt2020-12
+	   smpte2084
+	   smpte428
+	   arib-std-b67
+       colorspace
+	   Set the colorspace.	Available values are:
+
+	   auto
+	       Keep the same colorspace property (default).
+
+	   gbr
+	   bt709
+	   unknown
+	   fcc
+	   bt470bg
+	   smpte170m
+	   smpte240m
+	   ycgco
+	   bt2020nc
+	   bt2020c
+	   smpte2085
+	   chroma-derived-nc
+	   chroma-derived-c
+	   ictcp
+
+   sharpen_npp
+       Use the NVIDIA Performance Primitives (libnpp) to perform image
+       sharpening with border control.
+
+       The following additional options are accepted:
+
+       border_type
+	   Type of sampling to be used ad frame borders. One of the following:
+
+	   replicate
+	       Replicate pixel values.
+
+   shear
+       Apply shear transform to input video.
+
+       This filter supports the following options:
+
+       shx Shear factor in X-direction. Default value is 0.  Allowed range is
+	   from -2 to 2.
+
+       shy Shear factor in Y-direction. Default value is 0.  Allowed range is
+	   from -2 to 2.
+
+       fillcolor, c
+	   Set the color used to fill the output area not covered by the
+	   transformed video. For the general syntax of this option, check the
+	   "Color" section in the ffmpeg-utils manual.	If the special value
+	   "none" is selected then no background is printed (useful for
+	   example if the background is never shown).
+
+	   Default value is "black".
+
+       interp
+	   Set interpolation type. Can be "bilinear" or "nearest". Default is
+	   "bilinear".
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   showinfo
+       Show a line containing various information for each input video frame.
+       The input video is not modified.
+
+       This filter supports the following options:
+
+       checksum
+	   Calculate checksums of each plane. By default enabled.
+
+       udu_sei_as_ascii
+	   Try to print user data unregistered SEI as ascii character when
+	   possible, in hex format otherwise.
+
+       The shown line contains a sequence of key/value pairs of the form
+       key:value.
+
+       The following values are shown in the output:
+
+       n   The (sequential) number of the input frame, starting from 0.
+
+       pts The Presentation TimeStamp of the input frame, expressed as a
+	   number of time base units. The time base unit depends on the filter
+	   input pad.
+
+       pts_time
+	   The Presentation TimeStamp of the input frame, expressed as a
+	   number of seconds.
+
+       fmt The pixel format name.
+
+       sar The sample aspect ratio of the input frame, expressed in the form
+	   num/den.
+
+       s   The size of the input frame. For the syntax of this option, check
+	   the "Video size" section in the ffmpeg-utils manual.
+
+       i   The type of interlaced mode ("P" for "progressive", "T" for top
+	   field first, "B" for bottom field first).
+
+       iskey
+	   This is 1 if the frame is a key frame, 0 otherwise.
+
+       type
+	   The picture type of the input frame ("I" for an I-frame, "P" for a
+	   P-frame, "B" for a B-frame, or "?" for an unknown type).  Also
+	   refer to the documentation of the "AVPictureType" enum and of the
+	   "av_get_picture_type_char" function defined in libavutil/avutil.h.
+
+       checksum
+	   The Adler-32 checksum (printed in hexadecimal) of all the planes of
+	   the input frame.
+
+       plane_checksum
+	   The Adler-32 checksum (printed in hexadecimal) of each plane of the
+	   input frame, expressed in the form "[c0 c1 c2 c3]".
+
+       mean
+	   The mean value of pixels in each plane of the input frame,
+	   expressed in the form "[mean0 mean1 mean2 mean3]".
+
+       stdev
+	   The standard deviation of pixel values in each plane of the input
+	   frame, expressed in the form "[stdev0 stdev1 stdev2 stdev3]".
+
+   showpalette
+       Displays the 256 colors palette of each frame. This filter is only
+       relevant for pal8 pixel format frames.
+
+       It accepts the following option:
+
+       s   Set the size of the box used to represent one palette color entry.
+	   Default is 30 (for a "30x30" pixel box).
+
+   shuffleframes
+       Reorder and/or duplicate and/or drop video frames.
+
+       It accepts the following parameters:
+
+       mapping
+	   Set the destination indexes of input frames.  This is space or '|'
+	   separated list of indexes that maps input frames to output frames.
+	   Number of indexes also sets maximal value that each index may have.
+	   '-1' index have special meaning and that is to drop frame.
+
+       The first frame has the index 0. The default is to keep the input
+       unchanged.
+
+       Examples
+
+       o   Swap second and third frame of every three frames of the input:
+
+		   ffmpeg -i INPUT -vf "shuffleframes=0 2 1" OUTPUT
+
+       o   Swap 10th and 1st frame of every ten frames of the input:
+
+		   ffmpeg -i INPUT -vf "shuffleframes=9 1 2 3 4 5 6 7 8 0" OUTPUT
+
+   shufflepixels
+       Reorder pixels in video frames.
+
+       This filter accepts the following options:
+
+       direction, d
+	   Set shuffle direction. Can be forward or inverse direction.
+	   Default direction is forward.
+
+       mode, m
+	   Set shuffle mode. Can be horizontal, vertical or block mode.
+
+       width, w
+       height, h
+	   Set shuffle block_size. In case of horizontal shuffle mode only
+	   width part of size is used, and in case of vertical shuffle mode
+	   only height part of size is used.
+
+       seed, s
+	   Set random seed used with shuffling pixels. Mainly useful to set to
+	   be able to reverse filtering process to get original input.	For
+	   example, to reverse forward shuffle you need to use same parameters
+	   and exact same seed and to set direction to inverse.
+
+   shuffleplanes
+       Reorder and/or duplicate video planes.
+
+       It accepts the following parameters:
+
+       map0
+	   The index of the input plane to be used as the first output plane.
+
+       map1
+	   The index of the input plane to be used as the second output plane.
+
+       map2
+	   The index of the input plane to be used as the third output plane.
+
+       map3
+	   The index of the input plane to be used as the fourth output plane.
+
+       The first plane has the index 0. The default is to keep the input
+       unchanged.
+
+       Examples
+
+       o   Swap the second and third planes of the input:
+
+		   ffmpeg -i INPUT -vf shuffleplanes=0:2:1:3 OUTPUT
+
+   signalstats
+       Evaluate various visual metrics that assist in determining issues
+       associated with the digitization of analog video media.
+
+       By default the filter will log these metadata values:
+
+       YMIN
+	   Display the minimal Y value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       YLOW
+	   Display the Y value at the 10% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       YAVG
+	   Display the average Y value within the input frame. Expressed in
+	   range of [0-255].
+
+       YHIGH
+	   Display the Y value at the 90% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       YMAX
+	   Display the maximum Y value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       UMIN
+	   Display the minimal U value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       ULOW
+	   Display the U value at the 10% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       UAVG
+	   Display the average U value within the input frame. Expressed in
+	   range of [0-255].
+
+       UHIGH
+	   Display the U value at the 90% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       UMAX
+	   Display the maximum U value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       VMIN
+	   Display the minimal V value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       VLOW
+	   Display the V value at the 10% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       VAVG
+	   Display the average V value within the input frame. Expressed in
+	   range of [0-255].
+
+       VHIGH
+	   Display the V value at the 90% percentile within the input frame.
+	   Expressed in range of [0-255].
+
+       VMAX
+	   Display the maximum V value contained within the input frame.
+	   Expressed in range of [0-255].
+
+       SATMIN
+	   Display the minimal saturation value contained within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       SATLOW
+	   Display the saturation value at the 10% percentile within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       SATAVG
+	   Display the average saturation value within the input frame.
+	   Expressed in range of [0-~181.02].
+
+       SATHIGH
+	   Display the saturation value at the 90% percentile within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       SATMAX
+	   Display the maximum saturation value contained within the input
+	   frame.  Expressed in range of [0-~181.02].
+
+       HUEMED
+	   Display the median value for hue within the input frame. Expressed
+	   in range of [0-360].
+
+       HUEAVG
+	   Display the average value for hue within the input frame. Expressed
+	   in range of [0-360].
+
+       YDIF
+	   Display the average of sample value difference between all values
+	   of the Y plane in the current frame and corresponding values of the
+	   previous input frame.  Expressed in range of [0-255].
+
+       UDIF
+	   Display the average of sample value difference between all values
+	   of the U plane in the current frame and corresponding values of the
+	   previous input frame.  Expressed in range of [0-255].
+
+       VDIF
+	   Display the average of sample value difference between all values
+	   of the V plane in the current frame and corresponding values of the
+	   previous input frame.  Expressed in range of [0-255].
+
+       YBITDEPTH
+	   Display bit depth of Y plane in current frame.  Expressed in range
+	   of [0-16].
+
+       UBITDEPTH
+	   Display bit depth of U plane in current frame.  Expressed in range
+	   of [0-16].
+
+       VBITDEPTH
+	   Display bit depth of V plane in current frame.  Expressed in range
+	   of [0-16].
+
+       The filter accepts the following options:
+
+       stat
+       out stat specify an additional form of image analysis.  out output
+	   video with the specified type of pixel highlighted.
+
+	   Both options accept the following values:
+
+	   tout
+	       Identify temporal outliers pixels. A temporal outlier is a
+	       pixel unlike the neighboring pixels of the same field. Examples
+	       of temporal outliers include the results of video dropouts,
+	       head clogs, or tape tracking issues.
+
+	   vrep
+	       Identify vertical line repetition. Vertical line repetition
+	       includes similar rows of pixels within a frame. In born-digital
+	       video vertical line repetition is common, but this pattern is
+	       uncommon in video digitized from an analog source. When it
+	       occurs in video that results from the digitization of an analog
+	       source it can indicate concealment from a dropout compensator.
+
+	   brng
+	       Identify pixels that fall outside of legal broadcast range.
+
+       color, c
+	   Set the highlight color for the out option. The default color is
+	   yellow.
+
+       Examples
+
+       o   Output data of various video metrics:
+
+		   ffprobe -f lavfi movie=example.mov,signalstats="stat=tout+vrep+brng" -show_frames
+
+       o   Output specific data about the minimum and maximum values of the Y
+	   plane per frame:
+
+		   ffprobe -f lavfi movie=example.mov,signalstats -show_entries frame_tags=lavfi.signalstats.YMAX,lavfi.signalstats.YMIN
+
+       o   Playback video while highlighting pixels that are outside of
+	   broadcast range in red.
+
+		   ffplay example.mov -vf signalstats="out=brng:color=red"
+
+       o   Playback video with signalstats metadata drawn over the frame.
+
+		   ffplay example.mov -vf signalstats=stat=brng+vrep+tout,drawtext=fontfile=FreeSerif.ttf:textfile=signalstat_drawtext.txt
+
+	   The contents of signalstat_drawtext.txt used in the command are:
+
+		   time %{pts:hms}
+		   Y (%{metadata:lavfi.signalstats.YMIN}-%{metadata:lavfi.signalstats.YMAX})
+		   U (%{metadata:lavfi.signalstats.UMIN}-%{metadata:lavfi.signalstats.UMAX})
+		   V (%{metadata:lavfi.signalstats.VMIN}-%{metadata:lavfi.signalstats.VMAX})
+		   saturation maximum: %{metadata:lavfi.signalstats.SATMAX}
+
+   signature
+       Calculates the MPEG-7 Video Signature. The filter can handle more than
+       one input. In this case the matching between the inputs can be
+       calculated additionally.  The filter always passes through the first
+       input. The signature of each stream can be written into a file.
+
+       It accepts the following options:
+
+       detectmode
+	   Enable or disable the matching process.
+
+	   Available values are:
+
+	   off Disable the calculation of a matching (default).
+
+	   full
+	       Calculate the matching for the whole video and output whether
+	       the whole video matches or only parts.
+
+	   fast
+	       Calculate only until a matching is found or the video ends.
+	       Should be faster in some cases.
+
+       nb_inputs
+	   Set the number of inputs. The option value must be a non negative
+	   integer.  Default value is 1.
+
+       filename
+	   Set the path to which the output is written. If there is more than
+	   one input, the path must be a prototype, i.e. must contain %d or
+	   %0nd (where n is a positive integer), that will be replaced with
+	   the input number. If no filename is specified, no output will be
+	   written. This is the default.
+
+       format
+	   Choose the output format.
+
+	   Available values are:
+
+	   binary
+	       Use the specified binary representation (default).
+
+	   xml Use the specified xml representation.
+
+       th_d
+	   Set threshold to detect one word as similar. The option value must
+	   be an integer greater than zero. The default value is 9000.
+
+       th_dc
+	   Set threshold to detect all words as similar. The option value must
+	   be an integer greater than zero. The default value is 60000.
+
+       th_xh
+	   Set threshold to detect frames as similar. The option value must be
+	   an integer greater than zero. The default value is 116.
+
+       th_di
+	   Set the minimum length of a sequence in frames to recognize it as
+	   matching sequence. The option value must be a non negative integer
+	   value.  The default value is 0.
+
+       th_it
+	   Set the minimum relation, that matching frames to all frames must
+	   have.  The option value must be a double value between 0 and 1. The
+	   default value is 0.5.
+
+       Examples
+
+       o   To calculate the signature of an input video and store it in
+	   signature.bin:
+
+		   ffmpeg -i input.mkv -vf signature=filename=signature.bin -map 0:v -f null -
+
+       o   To detect whether two videos match and store the signatures in XML
+	   format in signature0.xml and signature1.xml:
+
+		   ffmpeg -i input1.mkv -i input2.mkv -filter_complex "[0:v][1:v] signature=nb_inputs=2:detectmode=full:format=xml:filename=signature%d.xml" -map :v -f null -
+
+   siti
+       Calculate Spatial Information (SI) and Temporal Information (TI) scores
+       for a video, as defined in ITU-T Rec. P.910 (11/21): Subjective video
+       quality assessment methods for multimedia applications. Available PDF
+       at <https://www.itu.int/rec/T-REC-P.910-202111-S/en>.  Note that this
+       is a legacy implementation that corresponds to a superseded
+       recommendation.	Refer to ITU-T Rec. P.910 (07/22) for the latest
+       version: <https://www.itu.int/rec/T-REC-P.910-202207-I/en>
+
+       It accepts the following option:
+
+       print_summary
+	   If set to 1, Summary statistics will be printed to the console.
+	   Default 0.
+
+       Examples
+
+       o   To calculate SI/TI metrics and print summary:
+
+		   ffmpeg -i input.mp4 -vf siti=print_summary=1 -f null -
+
+   smartblur
+       Blur the input video without impacting the outlines.
+
+       It accepts the following options:
+
+       luma_radius, lr
+	   Set the luma radius. The option value must be a float number in the
+	   range [0.1,5.0] that specifies the variance of the gaussian filter
+	   used to blur the image (slower if larger). Default value is 1.0.
+
+       luma_strength, ls
+	   Set the luma strength. The option value must be a float number in
+	   the range [-1.0,1.0] that configures the blurring. A value included
+	   in [0.0,1.0] will blur the image whereas a value included in
+	   [-1.0,0.0] will sharpen the image. Default value is 1.0.
+
+       luma_threshold, lt
+	   Set the luma threshold used as a coefficient to determine whether a
+	   pixel should be blurred or not. The option value must be an integer
+	   in the range [-30,30]. A value of 0 will filter all the image, a
+	   value included in [0,30] will filter flat areas and a value
+	   included in [-30,0] will filter edges. Default value is 0.
+
+       chroma_radius, cr
+	   Set the chroma radius. The option value must be a float number in
+	   the range [0.1,5.0] that specifies the variance of the gaussian
+	   filter used to blur the image (slower if larger). Default value is
+	   luma_radius.
+
+       chroma_strength, cs
+	   Set the chroma strength. The option value must be a float number in
+	   the range [-1.0,1.0] that configures the blurring. A value included
+	   in [0.0,1.0] will blur the image whereas a value included in
+	   [-1.0,0.0] will sharpen the image. Default value is luma_strength.
+
+       chroma_threshold, ct
+	   Set the chroma threshold used as a coefficient to determine whether
+	   a pixel should be blurred or not. The option value must be an
+	   integer in the range [-30,30]. A value of 0 will filter all the
+	   image, a value included in [0,30] will filter flat areas and a
+	   value included in [-30,0] will filter edges. Default value is
+	   luma_threshold.
+
+       If a chroma option is not explicitly set, the corresponding luma value
+       is set.
+
+   sobel
+       Apply sobel operator to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.
+
+       delta
+	   Set value which will be added to filtered result.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   spp
+       Apply a simple postprocessing filter that compresses and decompresses
+       the image at several (or - in the case of quality level 6 - all) shifts
+       and average the results.
+
+       The filter accepts the following options:
+
+       quality
+	   Set quality. This option defines the number of levels for
+	   averaging. It accepts an integer in the range 0-6. If set to 0, the
+	   filter will have no effect. A value of 6 means the higher quality.
+	   For each increment of that value the speed drops by a factor of
+	   approximately 2.  Default value is 3.
+
+       qp  Force a constant quantization parameter. If not set, the filter
+	   will use the QP from the video stream (if available).
+
+       mode
+	   Set thresholding mode. Available modes are:
+
+	   hard
+	       Set hard thresholding (default).
+
+	   soft
+	       Set soft thresholding (better de-ringing effect, but likely
+	       blurrier).
+
+       use_bframe_qp
+	   Enable the use of the QP from the B-Frames if set to 1. Using this
+	   option may cause flicker since the B-Frames have often larger QP.
+	   Default is 0 (not enabled).
+
+       Commands
+
+       This filter supports the following commands:
+
+       quality, level
+	   Set quality level. The value "max" can be used to set the maximum
+	   level, currently 6.
+
+   sr
+       Scale the input by applying one of the super-resolution methods based
+       on convolutional neural networks. Supported models:
+
+       o   Super-Resolution Convolutional Neural Network model (SRCNN).  See
+	   <https://arxiv.org/abs/1501.00092>.
+
+       o   Efficient Sub-Pixel Convolutional Neural Network model (ESPCN).
+	   See <https://arxiv.org/abs/1609.05158>.
+
+       Training scripts as well as scripts for model file (.pb) saving can be
+       found at <https://github.com/XueweiMeng/sr/tree/sr_dnn_native>.
+       Original repository is at
+       <https://github.com/HighVoltageRocknRoll/sr.git>.
+
+       The filter accepts the following options:
+
+       dnn_backend
+	   Specify which DNN backend to use for model loading and execution.
+	   This option accepts the following values:
+
+	   tensorflow
+	       TensorFlow backend. To enable this backend you need to install
+	       the TensorFlow for C library (see
+	       <https://www.tensorflow.org/install/lang_c>) and configure
+	       FFmpeg with "--enable-libtensorflow"
+
+       model
+	   Set path to model file specifying network architecture and its
+	   parameters.	Note that different backends use different file
+	   formats. TensorFlow, OpenVINO backend can load files for only its
+	   format.
+
+       scale_factor
+	   Set scale factor for SRCNN model. Allowed values are 2, 3 and 4.
+	   Default value is 2. Scale factor is necessary for SRCNN model,
+	   because it accepts input upscaled using bicubic upscaling with
+	   proper scale factor.
+
+       To get full functionality (such as async execution), please use the
+       dnn_processing filter.
+
+   ssim
+       Obtain the SSIM (Structural SImilarity Metric) between two input
+       videos.
+
+       This filter takes in input two input videos, the first input is
+       considered the "main" source and is passed unchanged to the output. The
+       second input is used as a "reference" video for computing the SSIM.
+
+       Both video inputs must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The filter stores the calculated SSIM of each frame.
+
+       The description of the accepted parameters follows.
+
+       stats_file, f
+	   If specified the filter will use the named file to save the SSIM of
+	   each individual frame. When filename equals "-" the data is sent to
+	   standard output.
+
+       The file printed if stats_file is selected, contains a sequence of
+       key/value pairs of the form key:value for each compared couple of
+       frames.
+
+       A description of each shown parameter follows:
+
+       n   sequential number of the input frame, starting from 1
+
+       Y, U, V, R, G, B
+	   SSIM of the compared frames for the component specified by the
+	   suffix.
+
+       All SSIM of the compared frames for the whole frame.
+
+       dB  Same as above but in dB representation.
+
+       This filter also supports the framesync options.
+
+       Examples
+
+       o   For example:
+
+		   movie=ref_movie.mpg, setpts=PTS-STARTPTS [main];
+		   [main][ref] ssim="stats_file=stats.log" [out]
+
+	   On this example the input file being processed is compared with the
+	   reference file ref_movie.mpg. The SSIM of each individual frame is
+	   stored in stats.log.
+
+       o   Another example with both psnr and ssim at same time:
+
+		   ffmpeg -i main.mpg -i ref.mpg -lavfi  "ssim;[0:v][1:v]psnr" -f null -
+
+       o   Another example with different containers:
+
+		   ffmpeg -i main.mpg -i ref.mkv -lavfi  "[0:v]settb=AVTB,setpts=PTS-STARTPTS[main];[1:v]settb=AVTB,setpts=PTS-STARTPTS[ref];[main][ref]ssim" -f null -
+
+   stereo3d
+       Convert between different stereoscopic image formats.
+
+       The filters accept the following options:
+
+       in  Set stereoscopic image format of input.
+
+	   Available values for input image formats are:
+
+	   sbsl
+	       side by side parallel (left eye left, right eye right)
+
+	   sbsr
+	       side by side crosseye (right eye left, left eye right)
+
+	   sbs2l
+	       side by side parallel with half width resolution (left eye
+	       left, right eye right)
+
+	   sbs2r
+	       side by side crosseye with half width resolution (right eye
+	       left, left eye right)
+
+	   abl
+	   tbl above-below (left eye above, right eye below)
+
+	   abr
+	   tbr above-below (right eye above, left eye below)
+
+	   ab2l
+	   tb2l
+	       above-below with half height resolution (left eye above, right
+	       eye below)
+
+	   ab2r
+	   tb2r
+	       above-below with half height resolution (right eye above, left
+	       eye below)
+
+	   al  alternating frames (left eye first, right eye second)
+
+	   ar  alternating frames (right eye first, left eye second)
+
+	   irl interleaved rows (left eye has top row, right eye starts on
+	       next row)
+
+	   irr interleaved rows (right eye has top row, left eye starts on
+	       next row)
+
+	   icl interleaved columns, left eye first
+
+	   icr interleaved columns, right eye first
+
+	       Default value is sbsl.
+
+       out Set stereoscopic image format of output.
+
+	   sbsl
+	       side by side parallel (left eye left, right eye right)
+
+	   sbsr
+	       side by side crosseye (right eye left, left eye right)
+
+	   sbs2l
+	       side by side parallel with half width resolution (left eye
+	       left, right eye right)
+
+	   sbs2r
+	       side by side crosseye with half width resolution (right eye
+	       left, left eye right)
+
+	   abl
+	   tbl above-below (left eye above, right eye below)
+
+	   abr
+	   tbr above-below (right eye above, left eye below)
+
+	   ab2l
+	   tb2l
+	       above-below with half height resolution (left eye above, right
+	       eye below)
+
+	   ab2r
+	   tb2r
+	       above-below with half height resolution (right eye above, left
+	       eye below)
+
+	   al  alternating frames (left eye first, right eye second)
+
+	   ar  alternating frames (right eye first, left eye second)
+
+	   irl interleaved rows (left eye has top row, right eye starts on
+	       next row)
+
+	   irr interleaved rows (right eye has top row, left eye starts on
+	       next row)
+
+	   arbg
+	       anaglyph red/blue gray (red filter on left eye, blue filter on
+	       right eye)
+
+	   argg
+	       anaglyph red/green gray (red filter on left eye, green filter
+	       on right eye)
+
+	   arcg
+	       anaglyph red/cyan gray (red filter on left eye, cyan filter on
+	       right eye)
+
+	   arch
+	       anaglyph red/cyan half colored (red filter on left eye, cyan
+	       filter on right eye)
+
+	   arcc
+	       anaglyph red/cyan color (red filter on left eye, cyan filter on
+	       right eye)
+
+	   arcd
+	       anaglyph red/cyan color optimized with the least squares
+	       projection of dubois (red filter on left eye, cyan filter on
+	       right eye)
+
+	   agmg
+	       anaglyph green/magenta gray (green filter on left eye, magenta
+	       filter on right eye)
+
+	   agmh
+	       anaglyph green/magenta half colored (green filter on left eye,
+	       magenta filter on right eye)
+
+	   agmc
+	       anaglyph green/magenta colored (green filter on left eye,
+	       magenta filter on right eye)
+
+	   agmd
+	       anaglyph green/magenta color optimized with the least squares
+	       projection of dubois (green filter on left eye, magenta filter
+	       on right eye)
+
+	   aybg
+	       anaglyph yellow/blue gray (yellow filter on left eye, blue
+	       filter on right eye)
+
+	   aybh
+	       anaglyph yellow/blue half colored (yellow filter on left eye,
+	       blue filter on right eye)
+
+	   aybc
+	       anaglyph yellow/blue colored (yellow filter on left eye, blue
+	       filter on right eye)
+
+	   aybd
+	       anaglyph yellow/blue color optimized with the least squares
+	       projection of dubois (yellow filter on left eye, blue filter on
+	       right eye)
+
+	   ml  mono output (left eye only)
+
+	   mr  mono output (right eye only)
+
+	   chl checkerboard, left eye first
+
+	   chr checkerboard, right eye first
+
+	   icl interleaved columns, left eye first
+
+	   icr interleaved columns, right eye first
+
+	   hdmi
+	       HDMI frame pack
+
+	   Default value is arcd.
+
+       Examples
+
+       o   Convert input video from side by side parallel to anaglyph
+	   yellow/blue dubois:
+
+		   stereo3d=sbsl:aybd
+
+       o   Convert input video from above below (left eye above, right eye
+	   below) to side by side crosseye.
+
+		   stereo3d=abl:sbsr
+
+   streamselect, astreamselect
+       Select video or audio streams.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of inputs. Default is 2.
+
+       map Set input indexes to remap to outputs.
+
+       Commands
+
+       The "streamselect" and "astreamselect" filter supports the following
+       commands:
+
+       map Set input indexes to remap to outputs.
+
+       Examples
+
+       o   Select first 5 seconds 1st stream and rest of time 2nd stream:
+
+		   sendcmd='5.0 streamselect map 1',streamselect=inputs=2:map=0
+
+       o   Same as above, but for audio:
+
+		   asendcmd='5.0 astreamselect map 1',astreamselect=inputs=2:map=0
+
+   subtitles
+       Draw subtitles on top of input video using the libass library.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libass". This filter also requires a build with libavcodec
+       and libavformat to convert the passed subtitles file to ASS (Advanced
+       Substation Alpha) subtitles format.
+
+       The filter accepts the following options:
+
+       filename, f
+	   Set the filename of the subtitle file to read. It must be
+	   specified.
+
+       original_size
+	   Specify the size of the original video, the video for which the ASS
+	   file was composed. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual.  Due to a misdesign in
+	   ASS aspect ratio arithmetic, this is necessary to correctly scale
+	   the fonts if the aspect ratio has been changed.
+
+       fontsdir
+	   Set a directory path containing fonts that can be used by the
+	   filter.  These fonts will be used in addition to whatever the font
+	   provider uses.
+
+       alpha
+	   Process alpha channel, by default alpha channel is untouched.
+
+       charenc
+	   Set subtitles input character encoding. "subtitles" filter only.
+	   Only useful if not UTF-8.
+
+       stream_index, si
+	   Set subtitles stream index. "subtitles" filter only.
+
+       force_style
+	   Override default style or script info parameters of the subtitles.
+	   It accepts a string containing ASS style format "KEY=VALUE" couples
+	   separated by ",".
+
+       wrap_unicode
+	   Break lines according to the Unicode Line Breaking Algorithm.
+	   Availability requires at least libass release 0.17.0 (or
+	   LIBASS_VERSION 0x01600010), and libass must have been built with
+	   libunibreak.
+
+	   The option is enabled by default except for native ASS.
+
+       If the first key is not specified, it is assumed that the first value
+       specifies the filename.
+
+       For example, to render the file sub.srt on top of the input video, use
+       the command:
+
+	       subtitles=sub.srt
+
+       which is equivalent to:
+
+	       subtitles=filename=sub.srt
+
+       To render the default subtitles stream from file video.mkv, use:
+
+	       subtitles=video.mkv
+
+       To render the second subtitles stream from that file, use:
+
+	       subtitles=video.mkv:si=1
+
+       To make the subtitles stream from sub.srt appear in 80% transparent
+       blue "DejaVu Serif", use:
+
+	       subtitles=sub.srt:force_style='Fontname=DejaVu Serif,PrimaryColour=&HCCFF0000'
+
+   super2xsai
+       Scale the input by 2x and smooth using the Super2xSaI (Scale and
+       Interpolate) pixel art scaling algorithm.
+
+       Useful for enlarging pixel art images without reducing sharpness.
+
+   swaprect
+       Swap two rectangular objects in video.
+
+       This filter accepts the following options:
+
+       w   Set object width.
+
+       h   Set object height.
+
+       x1  Set 1st rect x coordinate.
+
+       y1  Set 1st rect y coordinate.
+
+       x2  Set 2nd rect x coordinate.
+
+       y2  Set 2nd rect y coordinate.
+
+	   All expressions are evaluated once for each frame.
+
+       The all options are expressions containing the following constants:
+
+       w
+       h   The input width and height.
+
+       a   same as w / h
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (w / h) * sar
+
+       n   The number of the input frame, starting from 0.
+
+       t   The timestamp expressed in seconds. It's NAN if the input timestamp
+	   is unknown.
+
+       pos the position in the file of the input frame, NAN if unknown;
+	   deprecated, do not use
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   swapuv
+       Swap U & V plane.
+
+   tblend
+       Blend successive video frames.
+
+       See blend
+
+   telecine
+       Apply telecine process to the video.
+
+       This filter accepts the following options:
+
+       first_field
+	   top, t
+	       top field first
+
+	   bottom, b
+	       bottom field first The default value is "top".
+
+       pattern
+	   A string of numbers representing the pulldown pattern you wish to
+	   apply.  The default value is 23.
+
+	       Some typical patterns:
+
+	       NTSC output (30i):
+	       27.5p: 32222
+	       24p: 23 (classic)
+	       24p: 2332 (preferred)
+	       20p: 33
+	       18p: 334
+	       16p: 3444
+
+	       PAL output (25i):
+	       27.5p: 12222
+	       24p: 222222222223 ("Euro pulldown")
+	       16.67p: 33
+	       16p: 33333334
+
+   thistogram
+       Compute and draw a color distribution histogram for the input video
+       across time.
+
+       Unlike histogram video filter which only shows histogram of single
+       input frame at certain time, this filter shows also past histograms of
+       number of frames defined by "width" option.
+
+       The computed histogram is a representation of the color component
+       distribution in an image.
+
+       The filter accepts the following options:
+
+       width, w
+	   Set width of single color component output. Default value is 0.
+	   Value of 0 means width will be picked from input video.  This also
+	   set number of passed histograms to keep.  Allowed range is [0,
+	   8192].
+
+       display_mode, d
+	   Set display mode.  It accepts the following values:
+
+	   stack
+	       Per color component graphs are placed below each other.
+
+	   parade
+	       Per color component graphs are placed side by side.
+
+	   overlay
+	       Presents information identical to that in the "parade", except
+	       that the graphs representing color components are superimposed
+	       directly over one another.
+
+	   Default is "stack".
+
+       levels_mode, m
+	   Set mode. Can be either "linear", or "logarithmic".	Default is
+	   "linear".
+
+       components, c
+	   Set what color components to display.  Default is 7.
+
+       bgopacity, b
+	   Set background opacity. Default is 0.9.
+
+       envelope, e
+	   Show envelope. Default is disabled.
+
+       ecolor, ec
+	   Set envelope color. Default is "gold".
+
+       slide
+	   Set slide mode.
+
+	   Available values for slide is:
+
+	   frame
+	       Draw new frame when right border is reached.
+
+	   replace
+	       Replace old columns with new ones.
+
+	   scroll
+	       Scroll from right to left.
+
+	   rscroll
+	       Scroll from left to right.
+
+	   picture
+	       Draw single picture.
+
+	   Default is "replace".
+
+   threshold
+       Apply threshold effect to video stream.
+
+       This filter needs four video streams to perform thresholding.  First
+       stream is stream we are filtering.  Second stream is holding threshold
+       values, third stream is holding min values, and last, fourth stream is
+       holding max values.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+       For example if first stream pixel's component value is less then
+       threshold value of pixel component from 2nd threshold stream, third
+       stream value will picked, otherwise fourth stream pixel component value
+       will be picked.
+
+       Using color source filter one can perform various types of
+       thresholding:
+
+       Commands
+
+       This filter supports the all options as commands.
+
+       Examples
+
+       o   Binary threshold, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=black -f lavfi -i color=white -lavfi threshold output.avi
+
+       o   Inverted binary threshold, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=white -f lavfi -i color=black -lavfi threshold output.avi
+
+       o   Truncate binary threshold, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -i 320x240.avi -f lavfi -i color=gray -lavfi threshold output.avi
+
+       o   Threshold to zero, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -f lavfi -i color=white -i 320x240.avi -lavfi threshold output.avi
+
+       o   Inverted threshold to zero, using gray color as threshold:
+
+		   ffmpeg -i 320x240.avi -f lavfi -i color=gray -i 320x240.avi -f lavfi -i color=white -lavfi threshold output.avi
+
+   thumbnail
+       Select the most representative frame in a given sequence of consecutive
+       frames.
+
+       The filter accepts the following options:
+
+       n   Set the frames batch size to analyze; in a set of n frames, the
+	   filter will pick one of them, and then handle the next batch of n
+	   frames until the end. Default is 100.
+
+       log Set the log level to display picked frame stats.  Default is
+	   "info".
+
+       Since the filter keeps track of the whole frames sequence, a bigger n
+       value will result in a higher memory usage, so a high value is not
+       recommended.
+
+       Examples
+
+       o   Extract one picture each 50 frames:
+
+		   thumbnail=50
+
+       o   Complete example of a thumbnail creation with ffmpeg:
+
+		   ffmpeg -i in.avi -vf thumbnail,scale=300:200 -frames:v 1 out.png
+
+   tile
+       Tile several successive frames together.
+
+       The untile filter can do the reverse.
+
+       The filter accepts the following options:
+
+       layout
+	   Set the grid size in the form "COLUMNSxROWS". Range is up to
+	   UINT_MAX cells.  Default is "6x5".
+
+       nb_frames
+	   Set the maximum number of frames to render in the given area. It
+	   must be less than or equal to wxh. The default value is 0, meaning
+	   all the area will be used.
+
+       margin
+	   Set the outer border margin in pixels. Range is 0 to 1024. Default
+	   is 0.
+
+       padding
+	   Set the inner border thickness (i.e. the number of pixels between
+	   frames). For more advanced padding options (such as having
+	   different values for the edges), refer to the pad video filter.
+	   Range is 0 to 1024. Default is 0.
+
+       color
+	   Specify the color of the unused area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.  The
+	   default value of color is "black".
+
+       overlap
+	   Set the number of frames to overlap when tiling several successive
+	   frames together.  The value must be between 0 and nb_frames - 1.
+	   Default is 0.
+
+       init_padding
+	   Set the number of frames to initially be empty before displaying
+	   first output frame.	This controls how soon will one get first
+	   output frame.  The value must be between 0 and nb_frames - 1.
+	   Default is 0.
+
+       Examples
+
+       o   Produce 8x8 PNG tiles of all keyframes (-skip_frame nokey) in a
+	   movie:
+
+		   ffmpeg -skip_frame nokey -i file.avi -vf 'scale=128:72,tile=8x8' -an -vsync 0 keyframes%03d.png
+
+	   The -vsync 0 is necessary to prevent ffmpeg from duplicating each
+	   output frame to accommodate the originally detected frame rate.
+
+       o   Display 5 pictures in an area of "3x2" frames, with 7 pixels
+	   between them, and 2 pixels of initial margin, using mixed flat and
+	   named options:
+
+		   tile=3x2:nb_frames=5:padding=7:margin=2
+
+   tiltandshift
+       What happens when you invert time and space?
+
+       Normally a video is composed of several frames that represent a
+       different instant of time and shows a scence that evolves in the space
+       captured by the frame. This filter is the antipode of that concept,
+       taking inspiration by tilt and shift photography.
+
+       A filtered frame contains the whole timeline of events composing the
+       sequence, and this is obtained by placing a slice of pixels from each
+       frame into a single one. However, since there are no infinite-width
+       frames, this is done up the width of the input frame, and a video is
+       recomposed by shifting away one column for each subsequent frame. In
+       order to map space to time, the filter tilts each input frame as well,
+       so that motion is preseved. This is accomplished by progressively
+       selecting a different column from each input frame.
+
+       The end result is a sort of inverted parralax, so that far away objects
+       move much faster that the ones in the front. The ideal conditions for
+       this video effect are when there is either very little motion and the
+       backgroud is static, or when there is a lot of motion and a very wide
+       depth of field (eg. wide panorama, while moving on a train).
+
+       The filter accepts the following parameters:
+
+       tilt
+	   Tilt video while shifting (default). When unset, video will be
+	   sliding a static image, composed of the first column of each frame.
+
+       start
+	   What to do at the start of filtering (see below).
+
+       end What to do at the end of filtering (see below).
+
+       hold
+	   How many columns should pass through before start of filtering.
+
+       pad How many columns should be inserted before end of filtering.
+
+       Normally the filter shifts and tils from the very first frame, and
+       stops when the last one is received. However, before filtering starts,
+       normal video may be preseved, so that the effect is slowly shifted in
+       its place. Similarly, the last video frame may be reconstructed at the
+       end. Alternatively it is possible to just start and end with black.
+
+       none
+	   Filtering is starts immediately and ends when the last frame is
+	   received.
+
+       frame
+	   The first frames or the very last frame are kept intact during
+	   processing.
+
+       black
+	   Black is padded at the beginning or at the end of filtering.
+
+   tinterlace
+       Perform various types of temporal field interlacing.
+
+       Frames are counted starting from 1, so the first input frame is
+       considered odd.
+
+       The filter accepts the following options:
+
+       mode
+	   Specify the mode of the interlacing. This option can also be
+	   specified as a value alone. See below for a list of values for this
+	   option.
+
+	   Available values are:
+
+	   merge, 0
+	       Move odd frames into the upper field, even into the lower
+	       field, generating a double height frame at half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+
+	   drop_even, 1
+	       Only output odd frames, even frames are dropped, generating a
+	       frame with unchanged height at half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111			       33333
+		       11111			       33333
+		       11111			       33333
+		       11111			       33333
+
+	   drop_odd, 2
+	       Only output even frames, odd frames are dropped, generating a
+	       frame with unchanged height at half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+				       22222			       44444
+				       22222			       44444
+				       22222			       44444
+				       22222			       44444
+
+	   pad, 3
+	       Expand each frame to full height, but pad alternate lines with
+	       black, generating a frame with double height at the same input
+	       frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+		       11111	       .....	       33333	       .....
+		       .....	       22222	       .....	       44444
+
+	   interleave_top, 4
+	       Interleave the upper field from odd frames with the lower field
+	       from even frames, generating a frame with unchanged height at
+	       half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111<-	       22222	       33333<-	       44444
+		       11111	       22222<-	       33333	       44444<-
+		       11111<-	       22222	       33333<-	       44444
+		       11111	       22222<-	       33333	       44444<-
+
+		       Output:
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+
+	   interleave_bottom, 5
+	       Interleave the lower field from odd frames with the upper field
+	       from even frames, generating a frame with unchanged height at
+	       half frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222<-	       33333	       44444<-
+		       11111<-	       22222	       33333<-	       44444
+		       11111	       22222<-	       33333	       44444<-
+		       11111<-	       22222	       33333<-	       44444
+
+		       Output:
+		       22222			       44444
+		       11111			       33333
+		       22222			       44444
+		       11111			       33333
+
+	   interlacex2, 6
+	       Double frame rate with unchanged height. Frames are inserted
+	       each containing the second temporal field from the previous
+	       input frame and the first temporal field from the next input
+	       frame. This mode relies on the top_field_first flag. Useful for
+	       interlaced video displays with no field synchronisation.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+			11111		22222		33333		44444
+		       11111	       22222	       33333	       44444
+			11111		22222		33333		44444
+
+		       Output:
+		       11111   22222   22222   33333   33333   44444   44444
+			11111	11111	22222	22222	33333	33333	44444
+		       11111   22222   22222   33333   33333   44444   44444
+			11111	11111	22222	22222	33333	33333	44444
+
+	   mergex2, 7
+	       Move odd frames into the upper field, even into the lower
+	       field, generating a double height frame at same frame rate.
+
+			------> time
+		       Input:
+		       Frame 1	       Frame 2	       Frame 3	       Frame 4
+
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+		       11111	       22222	       33333	       44444
+
+		       Output:
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+		       11111	       33333	       33333	       55555
+		       22222	       22222	       44444	       44444
+
+	   Numeric values are deprecated but are accepted for backward
+	   compatibility reasons.
+
+	   Default mode is "merge".
+
+       flags
+	   Specify flags influencing the filter process.
+
+	   Available value for flags is:
+
+	   low_pass_filter, vlpf
+	       Enable linear vertical low-pass filtering in the filter.
+	       Vertical low-pass filtering is required when creating an
+	       interlaced destination from a progressive source which contains
+	       high-frequency vertical detail. Filtering will reduce interlace
+	       'twitter' and Moire patterning.
+
+	   complex_filter, cvlpf
+	       Enable complex vertical low-pass filtering.  This will slightly
+	       less reduce interlace 'twitter' and Moire patterning but better
+	       retain detail and subjective sharpness impression.
+
+	   bypass_il
+	       Bypass already interlaced frames, only adjust the frame rate.
+
+	   Vertical low-pass filtering and bypassing already interlaced frames
+	   can only be enabled for mode interleave_top and interleave_bottom.
+
+   tmedian
+       Pick median pixels from several successive input video frames.
+
+       The filter accepts the following options:
+
+       radius
+	   Set radius of median filter.  Default is 1. Allowed range is from 1
+	   to 127.
+
+       planes
+	   Set which planes to filter. Default value is 15, by which all
+	   planes are processed.
+
+       percentile
+	   Set median percentile. Default value is 0.5.  Default value of 0.5
+	   will pick always median values, while 0 will pick minimum values,
+	   and 1 maximum values.
+
+       Commands
+
+       This filter supports all above options as commands, excluding option
+       "radius".
+
+   tmidequalizer
+       Apply Temporal Midway Video Equalization effect.
+
+       Midway Video Equalization adjusts a sequence of video frames to have
+       the same histograms, while maintaining their dynamics as much as
+       possible. It's useful for e.g. matching exposures from a video frames
+       sequence.
+
+       This filter accepts the following option:
+
+       radius
+	   Set filtering radius. Default is 5. Allowed range is from 1 to 127.
+
+       sigma
+	   Set filtering sigma. Default is 0.5. This controls strength of
+	   filtering.  Setting this option to 0 effectively does nothing.
+
+       planes
+	   Set which planes to process. Default is 15, which is all available
+	   planes.
+
+   tmix
+       Mix successive video frames.
+
+       A description of the accepted options follows.
+
+       frames
+	   The number of successive frames to mix. If unspecified, it defaults
+	   to 3.
+
+       weights
+	   Specify weight of each input video frame.  Each weight is separated
+	   by space. If number of weights is smaller than number of frames
+	   last specified weight will be used for all remaining unset weights.
+
+       scale
+	   Specify scale, if it is set it will be multiplied with sum of each
+	   weight multiplied with pixel values to give final destination pixel
+	   value. By default scale is auto scaled to sum of weights.
+
+       planes
+	   Set which planes to filter. Default is all. Allowed range is from 0
+	   to 15.
+
+       Examples
+
+       o   Average 7 successive frames:
+
+		   tmix=frames=7:weights="1 1 1 1 1 1 1"
+
+       o   Apply simple temporal convolution:
+
+		   tmix=frames=3:weights="-1 3 -1"
+
+       o   Similar as above but only showing temporal differences:
+
+		   tmix=frames=3:weights="-1 2 -1":scale=1
+
+       Commands
+
+       This filter supports the following commands:
+
+       weights
+       scale
+       planes
+	   Syntax is same as option with same name.
+
+   tonemap
+       Tone map colors from different dynamic ranges.
+
+       This filter expects data in single precision floating point, as it
+       needs to operate on (and can output) out-of-range values. Another
+       filter, such as zscale, is needed to convert the resulting frame to a
+       usable format.
+
+       The tonemapping algorithms implemented only work on linear light, so
+       input data should be linearized beforehand (and possibly correctly
+       tagged).
+
+	       ffmpeg -i INPUT -vf zscale=transfer=linear,tonemap=clip,zscale=transfer=bt709,format=yuv420p OUTPUT
+
+       Options
+
+       The filter accepts the following options.
+
+       tonemap
+	   Set the tone map algorithm to use.
+
+	   Possible values are:
+
+	   none
+	       Do not apply any tone map, only desaturate overbright pixels.
+
+	   clip
+	       Hard-clip any out-of-range values. Use it for perfect color
+	       accuracy for in-range values, while distorting out-of-range
+	       values.
+
+	   linear
+	       Stretch the entire reference gamut to a linear multiple of the
+	       display.
+
+	   gamma
+	       Fit a logarithmic transfer between the tone curves.
+
+	   reinhard
+	       Preserve overall image brightness with a simple curve, using
+	       nonlinear contrast, which results in flattening details and
+	       degrading color accuracy.
+
+	   hable
+	       Preserve both dark and bright details better than reinhard, at
+	       the cost of slightly darkening everything. Use it when detail
+	       preservation is more important than color and brightness
+	       accuracy.
+
+	   mobius
+	       Smoothly map out-of-range values, while retaining contrast and
+	       colors for in-range material as much as possible. Use it when
+	       color accuracy is more important than detail preservation.
+
+	   Default is none.
+
+       param
+	   Tune the tone mapping algorithm.
+
+	   This affects the following algorithms:
+
+	   none
+	       Ignored.
+
+	   linear
+	       Specifies the scale factor to use while stretching.  Default to
+	       1.0.
+
+	   gamma
+	       Specifies the exponent of the function.	Default to 1.8.
+
+	   clip
+	       Specify an extra linear coefficient to multiply into the signal
+	       before clipping.  Default to 1.0.
+
+	   reinhard
+	       Specify the local contrast coefficient at the display peak.
+	       Default to 0.5, which means that in-gamut values will be about
+	       half as bright as when clipping.
+
+	   hable
+	       Ignored.
+
+	   mobius
+	       Specify the transition point from linear to mobius transform.
+	       Every value below this point is guaranteed to be mapped 1:1.
+	       The higher the value, the more accurate the result will be, at
+	       the cost of losing bright details.  Default to 0.3, which due
+	       to the steep initial slope still preserves in-range colors
+	       fairly accurately.
+
+       desat
+	   Apply desaturation for highlights that exceed this level of
+	   brightness. The higher the parameter, the more color information
+	   will be preserved. This setting helps prevent unnaturally blown-out
+	   colors for super-highlights, by (smoothly) turning into white
+	   instead. This makes images feel more natural, at the cost of
+	   reducing information about out-of-range colors.
+
+	   The default of 2.0 is somewhat conservative and will mostly just
+	   apply to skies or directly sunlit surfaces. A setting of 0.0
+	   disables this option.
+
+	   This option works only if the input frame has a supported color
+	   tag.
+
+       peak
+	   Override signal/nominal/reference peak with this value. Useful when
+	   the embedded peak information in display metadata is not reliable
+	   or when tone mapping from a lower range to a higher range.
+
+   tpad
+       Temporarily pad video frames.
+
+       The filter accepts the following options:
+
+       start
+	   Specify number of delay frames before input video stream. Default
+	   is 0.
+
+       stop
+	   Specify number of padding frames after input video stream.  Set to
+	   -1 to pad indefinitely. Default is 0.
+
+       start_mode
+	   Set kind of frames added to beginning of stream.  Can be either add
+	   or clone.  With add frames of solid-color are added.  With clone
+	   frames are clones of first frame.  Default is add.
+
+       stop_mode
+	   Set kind of frames added to end of stream.  Can be either add or
+	   clone.  With add frames of solid-color are added.  With clone
+	   frames are clones of last frame.  Default is add.
+
+       start_duration, stop_duration
+	   Specify the duration of the start/stop delay. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+	   These options override start and stop. Default is 0.
+
+       color
+	   Specify the color of the padded area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+	   The default value of color is "black".
+
+   transpose
+       Transpose rows with columns in the input video and optionally flip it.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   0, 4, cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip
+	       (default), that is:
+
+		       L.R     L.l
+		       . . ->  . .
+		       l.r     R.r
+
+	   1, 5, clock
+	       Rotate by 90 degrees clockwise, that is:
+
+		       L.R     l.L
+		       . . ->  . .
+		       l.r     r.R
+
+	   2, 6, cclock
+	       Rotate by 90 degrees counterclockwise, that is:
+
+		       L.R     R.r
+		       . . ->  . .
+		       l.r     L.l
+
+	   3, 7, clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip, that is:
+
+		       L.R     r.R
+		       . . ->  . .
+		       l.r     l.L
+
+	   For values between 4-7, the transposition is only done if the input
+	   video geometry is portrait and not landscape. These values are
+	   deprecated, the "passthrough" option should be used instead.
+
+	   Numerical values are deprecated, and should be dropped in favor of
+	   symbolic constants.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition.
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+	   Default value is "none".
+
+       For example to rotate by 90 degrees clockwise and preserve portrait
+       layout:
+
+	       transpose=dir=1:passthrough=portrait
+
+       The command above can also be specified as:
+
+	       transpose=1:portrait
+
+   transpose_npp
+       Transpose rows with columns in the input video and optionally flip it.
+       For more in depth examples see the transpose video filter, which shares
+       mostly the same options.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip.
+	       (default)
+
+	   clock
+	       Rotate by 90 degrees clockwise.
+
+	   cclock
+	       Rotate by 90 degrees counterclockwise.
+
+	   clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition. (default)
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+   trim
+       Trim the input so that the output contains one continuous subpart of
+       the input.
+
+       It accepts the following parameters:
+
+       start
+	   Specify the time of the start of the kept section, i.e. the frame
+	   with the timestamp start will be the first frame in the output.
+
+       end Specify the time of the first frame that will be dropped, i.e. the
+	   frame immediately preceding the one with the timestamp end will be
+	   the last frame in the output.
+
+       start_pts
+	   This is the same as start, except this option sets the start
+	   timestamp in timebase units instead of seconds.
+
+       end_pts
+	   This is the same as end, except this option sets the end timestamp
+	   in timebase units instead of seconds.
+
+       duration
+	   The maximum duration of the output in seconds.
+
+       start_frame
+	   The number of the first frame that should be passed to the output.
+
+       end_frame
+	   The number of the first frame that should be dropped.
+
+       start, end, and duration are expressed as time duration specifications;
+       see the Time duration section in the ffmpeg-utils(1) manual for the
+       accepted syntax.
+
+       Note that the first two sets of the start/end options and the duration
+       option look at the frame timestamp, while the _frame variants simply
+       count the frames that pass through the filter. Also note that this
+       filter does not modify the timestamps. If you wish for the output
+       timestamps to start at zero, insert a setpts filter after the trim
+       filter.
+
+       If multiple start or end options are set, this filter tries to be
+       greedy and keep all the frames that match at least one of the specified
+       constraints. To keep only the part that matches all the constraints at
+       once, chain multiple trim filters.
+
+       The defaults are such that all the input is kept. So it is possible to
+       set e.g.  just the end values to keep everything before the specified
+       time.
+
+       Examples:
+
+       o   Drop everything except the second minute of input:
+
+		   ffmpeg -i INPUT -vf trim=60:120
+
+       o   Keep only the first second:
+
+		   ffmpeg -i INPUT -vf trim=duration=1
+
+   unpremultiply
+       Apply alpha unpremultiply effect to input video stream using first
+       plane of second stream as alpha.
+
+       Both streams must have same dimensions and same pixel format.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes will be processed, unprocessed planes will be
+	   copied.  By default value 0xf, all planes will be processed.
+
+	   If the format has 1 or 2 components, then luma is bit 0.  If the
+	   format has 3 or 4 components: for RGB formats bit 0 is green, bit 1
+	   is blue and bit 2 is red; for YUV formats bit 0 is luma, bit 1 is
+	   chroma-U and bit 2 is chroma-V.  If present, the alpha channel is
+	   always the last bit.
+
+       inplace
+	   Do not require 2nd input for processing, instead use alpha plane
+	   from input stream.
+
+   unsharp
+       Sharpen or blur the input video.
+
+       It accepts the following parameters:
+
+       luma_msize_x, lx
+	   Set the luma matrix horizontal size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       luma_msize_y, ly
+	   Set the luma matrix vertical size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       luma_amount, la
+	   Set the luma effect strength. It must be a floating point number,
+	   reasonable values lay between -1.5 and 1.5.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+	   Default value is 1.0.
+
+       chroma_msize_x, cx
+	   Set the chroma matrix horizontal size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       chroma_msize_y, cy
+	   Set the chroma matrix vertical size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       chroma_amount, ca
+	   Set the chroma effect strength. It must be a floating point number,
+	   reasonable values lay between -1.5 and 1.5.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+	   Default value is 0.0.
+
+       alpha_msize_x, ax
+	   Set the alpha matrix horizontal size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       alpha_msize_y, ay
+	   Set the alpha matrix vertical size. It must be an odd integer
+	   between 3 and 23. The default value is 5.
+
+       alpha_amount, aa
+	   Set the alpha effect strength. It must be a floating point number,
+	   reasonable values lay between -1.5 and 1.5.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+	   Default value is 0.0.
+
+       All parameters are optional and default to the equivalent of the string
+       '5:5:1.0:5:5:0.0'.
+
+       Examples
+
+       o   Apply strong luma sharpen effect:
+
+		   unsharp=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5
+
+       o   Apply a strong blur of both luma and chroma parameters:
+
+		   unsharp=7:7:-2:7:7:-2
+
+   untile
+       Decompose a video made of tiled images into the individual images.
+
+       The frame rate of the output video is the frame rate of the input video
+       multiplied by the number of tiles.
+
+       This filter does the reverse of tile.
+
+       The filter accepts the following options:
+
+       layout
+	   Set the grid size (i.e. the number of lines and columns). For the
+	   syntax of this option, check the "Video size" section in the
+	   ffmpeg-utils manual.
+
+       Examples
+
+       o   Produce a 1-second video from a still image file made of 25 frames
+	   stacked vertically, like an analogic film reel:
+
+		   ffmpeg -r 1 -i image.jpg -vf untile=1x25 movie.mkv
+
+   uspp
+       Apply ultra slow/simple postprocessing filter that compresses and
+       decompresses the image at several (or - in the case of quality level 8
+       - all) shifts and average the results.
+
+       The way this differs from the behavior of spp is that uspp actually
+       encodes & decodes each case with libavcodec Snow, whereas spp uses a
+       simplified intra only 8x8 DCT similar to MJPEG.
+
+       This filter is only available in ffmpeg version 4.4 or earlier.
+
+       The filter accepts the following options:
+
+       quality
+	   Set quality. This option defines the number of levels for
+	   averaging. It accepts an integer in the range 0-8. If set to 0, the
+	   filter will have no effect. A value of 8 means the higher quality.
+	   For each increment of that value the speed drops by a factor of
+	   approximately 2.  Default value is 3.
+
+       qp  Force a constant quantization parameter. If not set, the filter
+	   will use the QP from the video stream (if available).
+
+       codec
+	   Use specified codec instead of snow.
+
+   v360
+       Convert 360 videos between various formats.
+
+       The filter accepts the following options:
+
+       input
+       output
+	   Set format of the input/output video.
+
+	   Available formats:
+
+	   e
+	   equirect
+	       Equirectangular projection.
+
+	   c3x2
+	   c6x1
+	   c1x6
+	       Cubemap with 3x2/6x1/1x6 layout.
+
+	       Format specific options:
+
+	       in_pad
+	       out_pad
+		   Set padding proportion for the input/output cubemap. Values
+		   in decimals.
+
+		   Example values:
+
+		   0   No padding.
+
+		   0.01
+		       1% of face is padding. For example, with 1920x1280
+		       resolution face size would be 640x640 and padding would
+		       be 3 pixels from each side. (640 * 0.01 = 6 pixels)
+
+		   Default value is @samp{0}.  Maximum value is @samp{0.1}.
+
+	       fin_pad
+	       fout_pad
+		   Set fixed padding for the input/output cubemap. Values in
+		   pixels.
+
+		   Default value is @samp{0}. If greater than zero it
+		   overrides other padding options.
+
+	       in_forder
+	       out_forder
+		   Set order of faces for the input/output cubemap. Choose one
+		   direction for each position.
+
+		   Designation of directions:
+
+		   r   right
+
+		   l   left
+
+		   u   up
+
+		   d   down
+
+		   f   forward
+
+		   b   back
+
+		   Default value is @samp{rludfb}.
+
+	       in_frot
+	       out_frot
+		   Set rotation of faces for the input/output cubemap. Choose
+		   one angle for each position.
+
+		   Designation of angles:
+
+		   0   0 degrees clockwise
+
+		   1   90 degrees clockwise
+
+		   2   180 degrees clockwise
+
+		   3   270 degrees clockwise
+
+		   Default value is @samp{000000}.
+
+	   eac Equi-Angular Cubemap.
+
+	   flat
+	   gnomonic
+	   rectilinear
+	       Regular video.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   dfisheye
+	       Dual fisheye.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   barrel
+	   fb
+	   barrelsplit
+	       Facebook's 360 formats.
+
+	   sg  Stereographic format.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   mercator
+	       Mercator format.
+
+	   ball
+	       Ball format, gives significant distortion toward the back.
+
+	   hammer
+	       Hammer-Aitoff map projection format.
+
+	   sinusoidal
+	       Sinusoidal map projection format.
+
+	   fisheye
+	       Fisheye projection.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   pannini
+	       Pannini projection.
+
+	       Format specific options:
+
+	       h_fov
+		   Set output pannini parameter.
+
+	       ih_fov
+		   Set input pannini parameter.
+
+	   cylindrical
+	       Cylindrical projection.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   perspective
+	       Perspective projection. (output only)
+
+	       Format specific options:
+
+	       v_fov
+		   Set perspective parameter.
+
+	   tetrahedron
+	       Tetrahedron projection.
+
+	   tsp Truncated square pyramid projection.
+
+	   he
+	   hequirect
+	       Half equirectangular projection.
+
+	   equisolid
+	       Equisolid format.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   og  Orthographic format.
+
+	       Format specific options:
+
+	       h_fov
+	       v_fov
+	       d_fov
+		   Set output horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	       ih_fov
+	       iv_fov
+	       id_fov
+		   Set input horizontal/vertical/diagonal field of view.
+		   Values in degrees.
+
+		   If diagonal field of view is set it overrides horizontal
+		   and vertical field of view.
+
+	   octahedron
+	       Octahedron projection.
+
+	   cylindricalea
+	       Cylindrical Equal Area projection.
+
+       interp
+	   Set interpolation method.Note: more complex interpolation methods
+	   require much more memory to run.
+
+	   Available methods:
+
+	   near
+	   nearest
+	       Nearest neighbour.
+
+	   line
+	   linear
+	       Bilinear interpolation.
+
+	   lagrange9
+	       Lagrange9 interpolation.
+
+	   cube
+	   cubic
+	       Bicubic interpolation.
+
+	   lanc
+	   lanczos
+	       Lanczos interpolation.
+
+	   sp16
+	   spline16
+	       Spline16 interpolation.
+
+	   gauss
+	   gaussian
+	       Gaussian interpolation.
+
+	   mitchell
+	       Mitchell interpolation.
+
+	   Default value is @samp{line}.
+
+       w
+       h   Set the output video resolution.
+
+	   Default resolution depends on formats.
+
+       in_stereo
+       out_stereo
+	   Set the input/output stereo format.
+
+	   2d  2D mono
+
+	   sbs Side by side
+
+	   tb  Top bottom
+
+	   Default value is @samp{2d} for input and output format.
+
+       yaw
+       pitch
+       roll
+	   Set rotation for the output video. Values in degrees.
+
+       rorder
+	   Set rotation order for the output video. Choose one item for each
+	   position.
+
+	   y, Y
+	       yaw
+
+	   p, P
+	       pitch
+
+	   r, R
+	       roll
+
+	   Default value is @samp{ypr}.
+
+       h_flip
+       v_flip
+       d_flip
+	   Flip the output video horizontally(swaps
+	   left-right)/vertically(swaps up-down)/in-depth(swaps back-forward).
+	   Boolean values.
+
+       ih_flip
+       iv_flip
+	   Set if input video is flipped horizontally/vertically. Boolean
+	   values.
+
+       in_trans
+	   Set if input video is transposed. Boolean value, by default
+	   disabled.
+
+       out_trans
+	   Set if output video needs to be transposed. Boolean value, by
+	   default disabled.
+
+       h_offset
+       v_offset
+	   Set output horizontal/vertical off-axis offset. Default is set to
+	   0.  Allowed range is from -1 to 1.
+
+       alpha_mask
+	   Build mask in alpha plane for all unmapped pixels by marking them
+	   fully transparent. Boolean value, by default disabled.
+
+       reset_rot
+	   Reset rotation of output video. Boolean value, by default disabled.
+
+       Examples
+
+       o   Convert equirectangular video to cubemap with 3x2 layout and 1%
+	   padding using bicubic interpolation:
+
+		   ffmpeg -i input.mkv -vf v360=e:c3x2:cubic:out_pad=0.01 output.mkv
+
+       o   Extract back view of Equi-Angular Cubemap:
+
+		   ffmpeg -i input.mkv -vf v360=eac:flat:yaw=180 output.mkv
+
+       o   Convert transposed and horizontally flipped Equi-Angular Cubemap in
+	   side-by-side stereo format to equirectangular top-bottom stereo
+	   format:
+
+		   v360=eac:equirect:in_stereo=sbs:in_trans=1:ih_flip=1:out_stereo=tb
+
+       Commands
+
+       This filter supports subset of above options as commands.
+
+   vaguedenoiser
+       Apply a wavelet based denoiser.
+
+       It transforms each frame from the video input into the wavelet domain,
+       using Cohen-Daubechies-Feauveau 9/7. Then it applies some filtering to
+       the obtained coefficients. It does an inverse wavelet transform after.
+       Due to wavelet properties, it should give a nice smoothed result, and
+       reduced noise, without blurring picture features.
+
+       This filter accepts the following options:
+
+       threshold
+	   The filtering strength. The higher, the more filtered the video
+	   will be.  Hard thresholding can use a higher threshold than soft
+	   thresholding before the video looks overfiltered. Default value is
+	   2.
+
+       method
+	   The filtering method the filter will use.
+
+	   It accepts the following values:
+
+	   hard
+	       All values under the threshold will be zeroed.
+
+	   soft
+	       All values under the threshold will be zeroed. All values above
+	       will be reduced by the threshold.
+
+	   garrote
+	       Scales or nullifies coefficients - intermediary between (more)
+	       soft and (less) hard thresholding.
+
+	   Default is garrote.
+
+       nsteps
+	   Number of times, the wavelet will decompose the picture. Picture
+	   can't be decomposed beyond a particular point (typically, 8 for a
+	   640x480 frame - as 2^9 = 512 > 480). Valid values are integers
+	   between 1 and 32. Default value is 6.
+
+       percent
+	   Partial of full denoising (limited coefficients shrinking), from 0
+	   to 100. Default value is 85.
+
+       planes
+	   A list of the planes to process. By default all planes are
+	   processed.
+
+       type
+	   The threshold type the filter will use.
+
+	   It accepts the following values:
+
+	   universal
+	       Threshold used is same for all decompositions.
+
+	   bayes
+	       Threshold used depends also on each decomposition coefficients.
+
+	   Default is universal.
+
+   varblur
+       Apply variable blur filter by using 2nd video stream to set blur
+       radius.	The 2nd stream must have the same dimensions.
+
+       This filter accepts the following options:
+
+       min_r
+	   Set min allowed radius. Allowed range is from 0 to 254. Default is
+	   0.
+
+       max_r
+	   Set max allowed radius. Allowed range is from 1 to 255. Default is
+	   8.
+
+       planes
+	   Set which planes to process. By default, all are used.
+
+       The "varblur" filter also supports the framesync options.
+
+       Commands
+
+       This filter supports all the above options as commands.
+
+   vectorscope
+       Display 2 color component values in the two dimensional graph (which is
+       called a vectorscope).
+
+       This filter accepts the following options:
+
+       mode, m
+	   Set vectorscope mode.
+
+	   It accepts the following values:
+
+	   gray
+	   tint
+	       Gray values are displayed on graph, higher brightness means
+	       more pixels have same component color value on location in
+	       graph. This is the default mode.
+
+	   color
+	       Gray values are displayed on graph. Surrounding pixels values
+	       which are not present in video frame are drawn in gradient of 2
+	       color components which are set by option "x" and "y". The 3rd
+	       color component is static.
+
+	   color2
+	       Actual color components values present in video frame are
+	       displayed on graph.
+
+	   color3
+	       Similar as color2 but higher frequency of same values "x" and
+	       "y" on graph increases value of another color component, which
+	       is luminance by default values of "x" and "y".
+
+	   color4
+	       Actual colors present in video frame are displayed on graph. If
+	       two different colors map to same position on graph then color
+	       with higher value of component not present in graph is picked.
+
+	   color5
+	       Gray values are displayed on graph. Similar to "color" but with
+	       3rd color component picked from radial gradient.
+
+       x   Set which color component will be represented on X-axis. Default is
+	   1.
+
+       y   Set which color component will be represented on Y-axis. Default is
+	   2.
+
+       intensity, i
+	   Set intensity, used by modes: gray, color, color3 and color5 for
+	   increasing brightness of color component which represents frequency
+	   of (X, Y) location in graph.
+
+       envelope, e
+	   none
+	       No envelope, this is default.
+
+	   instant
+	       Instant envelope, even darkest single pixel will be clearly
+	       highlighted.
+
+	   peak
+	       Hold maximum and minimum values presented in graph over time.
+	       This way you can still spot out of range values without
+	       constantly looking at vectorscope.
+
+	   peak+instant
+	       Peak and instant envelope combined together.
+
+       graticule, g
+	   Set what kind of graticule to draw.
+
+	   none
+	   green
+	   color
+	   invert
+       opacity, o
+	   Set graticule opacity.
+
+       flags, f
+	   Set graticule flags.
+
+	   white
+	       Draw graticule for white point.
+
+	   black
+	       Draw graticule for black point.
+
+	   name
+	       Draw color points short names.
+
+       bgopacity, b
+	   Set background opacity.
+
+       lthreshold, l
+	   Set low threshold for color component not represented on X or Y
+	   axis.  Values lower than this value will be ignored. Default is 0.
+	   Note this value is multiplied with actual max possible value one
+	   pixel component can have. So for 8-bit input and low threshold
+	   value of 0.1 actual threshold is 0.1 * 255 = 25.
+
+       hthreshold, h
+	   Set high threshold for color component not represented on X or Y
+	   axis.  Values higher than this value will be ignored. Default is 1.
+	   Note this value is multiplied with actual max possible value one
+	   pixel component can have. So for 8-bit input and high threshold
+	   value of 0.9 actual threshold is 0.9 * 255 = 230.
+
+       colorspace, c
+	   Set what kind of colorspace to use when drawing graticule.
+
+	   auto
+	   601
+	   709
+
+	   Default is auto.
+
+       tint0, t0
+       tint1, t1
+	   Set color tint for gray/tint vectorscope mode. By default both
+	   options are zero.  This means no tint, and output will remain gray.
+
+   vidstabdetect
+       Analyze video stabilization/deshaking. Perform pass 1 of 2, see
+       vidstabtransform for pass 2.
+
+       This filter generates a file with relative translation and rotation
+       transform information about subsequent frames, which is then used by
+       the vidstabtransform filter.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libvidstab".
+
+       This filter accepts the following options:
+
+       result
+	   Set the path to the file used to write the transforms information.
+	   Default value is transforms.trf.
+
+       shakiness
+	   Set how shaky the video is and how quick the camera is. It accepts
+	   an integer in the range 1-10, a value of 1 means little shakiness,
+	   a value of 10 means strong shakiness. Default value is 5.
+
+       accuracy
+	   Set the accuracy of the detection process. It must be a value in
+	   the range 1-15. A value of 1 means low accuracy, a value of 15
+	   means high accuracy. Default value is 15.
+
+       stepsize
+	   Set stepsize of the search process. The region around minimum is
+	   scanned with 1 pixel resolution. Default value is 6.
+
+       mincontrast
+	   Set minimum contrast. Below this value a local measurement field is
+	   discarded. Must be a floating point value in the range 0-1. Default
+	   value is 0.3.
+
+       tripod
+	   Set reference frame number for tripod mode.
+
+	   If enabled, the motion of the frames is compared to a reference
+	   frame in the filtered stream, identified by the specified number.
+	   The idea is to compensate all movements in a more-or-less static
+	   scene and keep the camera view absolutely still.
+
+	   If set to 0, it is disabled. The frames are counted starting from
+	   1.
+
+       show
+	   Show fields and transforms in the resulting frames. It accepts an
+	   integer in the range 0-2. Default value is 0, which disables any
+	   visualization.
+
+       fileformat
+	   Format for the transforms data file to be written.  Acceptable
+	   values are
+
+	   ascii
+	       Human-readable plain text
+
+	   binary
+	       Binary format, roughly 40% smaller than "ascii". (default)
+
+       Examples
+
+       o   Use default values:
+
+		   vidstabdetect
+
+       o   Analyze strongly shaky movie and put the results in file
+	   mytransforms.trf:
+
+		   vidstabdetect=shakiness=10:accuracy=15:result="mytransforms.trf"
+
+       o   Visualize the result of internal transformations in the resulting
+	   video:
+
+		   vidstabdetect=show=1
+
+       o   Analyze a video with medium shakiness using ffmpeg:
+
+		   ffmpeg -i input -vf vidstabdetect=shakiness=5:show=1 dummy.avi
+
+   vidstabtransform
+       Video stabilization/deshaking: pass 2 of 2, see vidstabdetect for pass
+       1.
+
+       Read a file with transform information for each frame and
+       apply/compensate them. Together with the vidstabdetect filter this can
+       be used to deshake videos. See also
+       <http://public.hronopik.de/vid.stab>. It is important to also use the
+       unsharp filter, see below.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-libvidstab".
+
+       Options
+
+       input
+	   Set path to the file used to read the transforms. Default value is
+	   transforms.trf.
+
+       smoothing
+	   Set the number of frames (value*2 + 1) used for lowpass filtering
+	   the camera movements. Default value is 10.
+
+	   For example a number of 10 means that 21 frames are used (10 in the
+	   past and 10 in the future) to smoothen the motion in the video. A
+	   larger value leads to a smoother video, but limits the acceleration
+	   of the camera (pan/tilt movements). 0 is a special case where a
+	   static camera is simulated.
+
+       optalgo
+	   Set the camera path optimization algorithm.
+
+	   Accepted values are:
+
+	   gauss
+	       gaussian kernel low-pass filter on camera motion (default)
+
+	   avg averaging on transformations
+
+       maxshift
+	   Set maximal number of pixels to translate frames. Default value is
+	   -1, meaning no limit.
+
+       maxangle
+	   Set maximal angle in radians (degree*PI/180) to rotate frames.
+	   Default value is -1, meaning no limit.
+
+       crop
+	   Specify how to deal with borders that may be visible due to
+	   movement compensation.
+
+	   Available values are:
+
+	   keep
+	       keep image information from previous frame (default)
+
+	   black
+	       fill the border black
+
+       invert
+	   Invert transforms if set to 1. Default value is 0.
+
+       relative
+	   Consider transforms as relative to previous frame if set to 1,
+	   absolute if set to 0. Default value is 0.
+
+       zoom
+	   Set percentage to zoom. A positive value will result in a zoom-in
+	   effect, a negative value in a zoom-out effect. Default value is 0
+	   (no zoom).
+
+       optzoom
+	   Set optimal zooming to avoid borders.
+
+	   Accepted values are:
+
+	   0   disabled
+
+	   1   optimal static zoom value is determined (only very strong
+	       movements will lead to visible borders) (default)
+
+	   2   optimal adaptive zoom value is determined (no borders will be
+	       visible), see zoomspeed
+
+	   Note that the value given at zoom is added to the one calculated
+	   here.
+
+       zoomspeed
+	   Set percent to zoom maximally each frame (enabled when optzoom is
+	   set to 2). Range is from 0 to 5, default value is 0.25.
+
+       interpol
+	   Specify type of interpolation.
+
+	   Available values are:
+
+	   no  no interpolation
+
+	   linear
+	       linear only horizontal
+
+	   bilinear
+	       linear in both directions (default)
+
+	   bicubic
+	       cubic in both directions (slow)
+
+       tripod
+	   Enable virtual tripod mode if set to 1, which is equivalent to
+	   "relative=0:smoothing=0". Default value is 0.
+
+	   Use also "tripod" option of vidstabdetect.
+
+       debug
+	   Increase log verbosity if set to 1. Also the detected global
+	   motions are written to the temporary file global_motions.trf.
+	   Default value is 0.
+
+       Examples
+
+       o   Use ffmpeg for a typical stabilization with default values:
+
+		   ffmpeg -i inp.mpeg -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 inp_stabilized.mpeg
+
+	   Note the use of the unsharp filter which is always recommended.
+
+       o   Zoom in a bit more and load transform data from a given file:
+
+		   vidstabtransform=zoom=5:input="mytransforms.trf"
+
+       o   Smoothen the video even more:
+
+		   vidstabtransform=smoothing=30
+
+   vflip
+       Flip the input video vertically.
+
+       For example, to vertically flip a video with ffmpeg:
+
+	       ffmpeg -i in.avi -vf "vflip" out.avi
+
+   vfrdet
+       Detect variable frame rate video.
+
+       This filter tries to detect if the input is variable or constant frame
+       rate.
+
+       At end it will output number of frames detected as having variable
+       delta pts, and ones with constant delta pts.  If there was frames with
+       variable delta, than it will also show min, max and average delta
+       encountered.
+
+   vibrance
+       Boost or alter saturation.
+
+       The filter accepts the following options:
+
+       intensity
+	   Set strength of boost if positive value or strength of alter if
+	   negative value.  Default is 0. Allowed range is from -2 to 2.
+
+       rbal
+	   Set the red balance. Default is 1. Allowed range is from -10 to 10.
+
+       gbal
+	   Set the green balance. Default is 1. Allowed range is from -10 to
+	   10.
+
+       bbal
+	   Set the blue balance. Default is 1. Allowed range is from -10 to
+	   10.
+
+       rlum
+	   Set the red luma coefficient.
+
+       glum
+	   Set the green luma coefficient.
+
+       blum
+	   Set the blue luma coefficient.
+
+       alternate
+	   If "intensity" is negative and this is set to 1, colors will
+	   change, otherwise colors will be less saturated, more towards gray.
+
+       Commands
+
+       This filter supports the all above options as commands.
+
+   vif
+       Obtain the average VIF (Visual Information Fidelity) between two input
+       videos.
+
+       This filter takes two input videos.
+
+       Both input videos must have the same resolution and pixel format for
+       this filter to work correctly. Also it assumes that both inputs have
+       the same number of frames, which are compared one by one.
+
+       The obtained average VIF score is printed through the logging system.
+
+       The filter stores the calculated VIF score of each frame.
+
+       This filter also supports the framesync options.
+
+       In the below example the input file main.mpg being processed is
+       compared with the reference file ref.mpg.
+
+	       ffmpeg -i main.mpg -i ref.mpg -lavfi vif -f null -
+
+   vignette
+       Make or reverse a natural vignetting effect.
+
+       The filter accepts the following options:
+
+       angle, a
+	   Set lens angle expression as a number of radians.
+
+	   The value is clipped in the "[0,PI/2]" range.
+
+	   Default value: "PI/5"
+
+       x0
+       y0  Set center coordinates expressions. Respectively "w/2" and "h/2" by
+	   default.
+
+       mode
+	   Set forward/backward mode.
+
+	   Available modes are:
+
+	   forward
+	       The larger the distance from the central point, the darker the
+	       image becomes.
+
+	   backward
+	       The larger the distance from the central point, the brighter
+	       the image becomes.  This can be used to reverse a vignette
+	       effect, though there is no automatic detection to extract the
+	       lens angle and other settings (yet). It can also be used to
+	       create a burning effect.
+
+	   Default value is forward.
+
+       eval
+	   Set evaluation mode for the expressions (angle, x0, y0).
+
+	   It accepts the following values:
+
+	   init
+	       Evaluate expressions only once during the filter
+	       initialization.
+
+	   frame
+	       Evaluate expressions for each incoming frame. This is way
+	       slower than the init mode since it requires all the scalers to
+	       be re-computed, but it allows advanced dynamic expressions.
+
+	   Default value is init.
+
+       dither
+	   Set dithering to reduce the circular banding effects. Default is 1
+	   (enabled).
+
+       aspect
+	   Set vignette aspect. This setting allows one to adjust the shape of
+	   the vignette.  Setting this value to the SAR of the input will make
+	   a rectangular vignetting following the dimensions of the video.
+
+	   Default is "1/1".
+
+       Expressions
+
+       The alpha, x0 and y0 expressions can contain the following parameters.
+
+       w
+       h   input width and height
+
+       n   the number of input frame, starting from 0
+
+       pts the PTS (Presentation TimeStamp) time of the filtered video frame,
+	   expressed in TB units, NAN if undefined
+
+       r   frame rate of the input video, NAN if the input frame rate is
+	   unknown
+
+       t   the PTS (Presentation TimeStamp) of the filtered video frame,
+	   expressed in seconds, NAN if undefined
+
+       tb  time base of the input video
+
+       Examples
+
+       o   Apply simple strong vignetting effect:
+
+		   vignette=PI/4
+
+       o   Make a flickering vignetting:
+
+		   vignette='PI/4+random(1)*PI/50':eval=frame
+
+   vmafmotion
+       Obtain the average VMAF motion score of a video.  It is one of the
+       component metrics of VMAF.
+
+       The obtained average motion score is printed through the logging
+       system.
+
+       The filter accepts the following options:
+
+       stats_file
+	   If specified, the filter will use the named file to save the motion
+	   score of each frame with respect to the previous frame.  When
+	   filename equals "-" the data is sent to standard output.
+
+       Example:
+
+	       ffmpeg -i ref.mpg -vf vmafmotion -f null -
+
+   vstack
+       Stack input videos vertically.
+
+       All streams must be of same pixel format and of same width.
+
+       Note that this filter is faster than using overlay and pad filter to
+       create same output.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of input streams. Default is 2.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+   w3fdif
+       Deinterlace the input video ("w3fdif" stands for "Weston 3 Field
+       Deinterlacing Filter").
+
+       Based on the process described by Martin Weston for BBC R&D, and
+       implemented based on the de-interlace algorithm written by Jim
+       Easterbrook for BBC R&D, the Weston 3 field deinterlacing filter uses
+       filter coefficients calculated by BBC R&D.
+
+       This filter uses field-dominance information in frame to decide which
+       of each pair of fields to place first in the output.  If it gets it
+       wrong use setfield filter before "w3fdif" filter.
+
+       There are two sets of filter coefficients, so called "simple" and
+       "complex". Which set of filter coefficients is used can be set by
+       passing an optional parameter:
+
+       filter
+	   Set the interlacing filter coefficients. Accepts one of the
+	   following values:
+
+	   simple
+	       Simple filter coefficient set.
+
+	   complex
+	       More-complex filter coefficient set.
+
+	   Default value is complex.
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   frame
+	       Output one frame for each frame.
+
+	   field
+	       Output one frame for each field.
+
+	   The default value is "field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   tff Assume the top field is first.
+
+	   bff Assume the bottom field is first.
+
+	   auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   all Deinterlace all frames,
+
+	   interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   Default value is all.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   waveform
+       Video waveform monitor.
+
+       The waveform monitor plots color component intensity. By default luma
+       only. Each column of the waveform corresponds to a column of pixels in
+       the source video.
+
+       It accepts the following options:
+
+       mode, m
+	   Can be either "row", or "column". Default is "column".  In row
+	   mode, the graph on the left side represents color component value 0
+	   and the right side represents value = 255. In column mode, the top
+	   side represents color component value = 0 and bottom side
+	   represents value = 255.
+
+       intensity, i
+	   Set intensity. Smaller values are useful to find out how many
+	   values of the same luminance are distributed across input
+	   rows/columns.  Default value is 0.04. Allowed range is [0, 1].
+
+       mirror, r
+	   Set mirroring mode. 0 means unmirrored, 1 means mirrored.  In
+	   mirrored mode, higher values will be represented on the left side
+	   for "row" mode and at the top for "column" mode. Default is 1
+	   (mirrored).
+
+       display, d
+	   Set display mode.  It accepts the following values:
+
+	   overlay
+	       Presents information identical to that in the "parade", except
+	       that the graphs representing color components are superimposed
+	       directly over one another.
+
+	       This display mode makes it easier to spot relative differences
+	       or similarities in overlapping areas of the color components
+	       that are supposed to be identical, such as neutral whites,
+	       grays, or blacks.
+
+	   stack
+	       Display separate graph for the color components side by side in
+	       "row" mode or one below the other in "column" mode.
+
+	   parade
+	       Display separate graph for the color components side by side in
+	       "column" mode or one below the other in "row" mode.
+
+	       Using this display mode makes it easy to spot color casts in
+	       the highlights and shadows of an image, by comparing the
+	       contours of the top and the bottom graphs of each waveform.
+	       Since whites, grays, and blacks are characterized by exactly
+	       equal amounts of red, green, and blue, neutral areas of the
+	       picture should display three waveforms of roughly equal
+	       width/height. If not, the correction is easy to perform by
+	       making level adjustments the three waveforms.
+
+	   Default is "stack".
+
+       components, c
+	   Set which color components to display. Default is 1, which means
+	   only luma or red color component if input is in RGB colorspace. If
+	   is set for example to 7 it will display all 3 (if) available color
+	   components.
+
+       envelope, e
+	   none
+	       No envelope, this is default.
+
+	   instant
+	       Instant envelope, minimum and maximum values presented in graph
+	       will be easily visible even with small "step" value.
+
+	   peak
+	       Hold minimum and maximum values presented in graph across time.
+	       This way you can still spot out of range values without
+	       constantly looking at waveforms.
+
+	   peak+instant
+	       Peak and instant envelope combined together.
+
+       filter, f
+	   lowpass
+	       No filtering, this is default.
+
+	   flat
+	       Luma and chroma combined together.
+
+	   aflat
+	       Similar as above, but shows difference between blue and red
+	       chroma.
+
+	   xflat
+	       Similar as above, but use different colors.
+
+	   yflat
+	       Similar as above, but again with different colors.
+
+	   chroma
+	       Displays only chroma.
+
+	   color
+	       Displays actual color value on waveform.
+
+	   acolor
+	       Similar as above, but with luma showing frequency of chroma
+	       values.
+
+       graticule, g
+	   Set which graticule to display.
+
+	   none
+	       Do not display graticule.
+
+	   green
+	       Display green graticule showing legal broadcast ranges.
+
+	   orange
+	       Display orange graticule showing legal broadcast ranges.
+
+	   invert
+	       Display invert graticule showing legal broadcast ranges.
+
+       opacity, o
+	   Set graticule opacity.
+
+       flags, fl
+	   Set graticule flags.
+
+	   numbers
+	       Draw numbers above lines. By default enabled.
+
+	   dots
+	       Draw dots instead of lines.
+
+       scale, s
+	   Set scale used for displaying graticule.
+
+	   digital
+	   millivolts
+	   ire
+
+	   Default is digital.
+
+       bgopacity, b
+	   Set background opacity.
+
+       tint0, t0
+       tint1, t1
+	   Set tint for output.  Only used with lowpass filter and when
+	   display is not overlay and input pixel formats are not RGB.
+
+       fitmode, fm
+	   Set sample aspect ratio of video output frames.  Can be used to
+	   configure waveform so it is not streched too much in one of
+	   directions.
+
+	   none
+	       Set sample aspect ration to 1/1.
+
+	   size
+	       Set sample aspect ratio to match input size of video
+
+	   Default is none.
+
+       input
+	   Set input formats for filter to pick from.  Can be all, for
+	   selecting from all available formats, or first, for selecting first
+	   available format.  Default is first.
+
+   weave, doubleweave
+       The "weave" takes a field-based video input and join each two
+       sequential fields into single frame, producing a new double height clip
+       with half the frame rate and half the frame count.
+
+       The "doubleweave" works same as "weave" but without halving frame rate
+       and frame count.
+
+       It accepts the following option:
+
+       first_field
+	   Set first field. Available values are:
+
+	   top, t
+	       Set the frame as top-field-first.
+
+	   bottom, b
+	       Set the frame as bottom-field-first.
+
+       Examples
+
+       o   Interlace video using select and separatefields filter:
+
+		   separatefields,select=eq(mod(n,4),0)+eq(mod(n,4),3),weave
+
+   xbr
+       Apply the xBR high-quality magnification filter which is designed for
+       pixel art. It follows a set of edge-detection rules, see
+       <https://forums.libretro.com/t/xbr-algorithm-tutorial/123>.
+
+       It accepts the following option:
+
+       n   Set the scaling dimension: 2 for "2xBR", 3 for "3xBR" and 4 for
+	   "4xBR".  Default is 3.
+
+   xcorrelate
+       Apply normalized cross-correlation between first and second input video
+       stream.
+
+       Second input video stream dimensions must be lower than first input
+       video stream.
+
+       The filter accepts the following options:
+
+       planes
+	   Set which planes to process.
+
+       secondary
+	   Set which secondary video frames will be processed from second
+	   input video stream, can be first or all. Default is all.
+
+       The "xcorrelate" filter also supports the framesync options.
+
+   xfade
+       Apply cross fade from one input video stream to another input video
+       stream.	The cross fade is applied for specified duration.
+
+       Both inputs must be constant frame-rate and have the same resolution,
+       pixel format, frame rate and timebase.
+
+       The filter accepts the following options:
+
+       transition
+	   Set one of available transition effects:
+
+	   custom
+	   fade
+	   wipeleft
+	   wiperight
+	   wipeup
+	   wipedown
+	   slideleft
+	   slideright
+	   slideup
+	   slidedown
+	   circlecrop
+	   rectcrop
+	   distance
+	   fadeblack
+	   fadewhite
+	   radial
+	   smoothleft
+	   smoothright
+	   smoothup
+	   smoothdown
+	   circleopen
+	   circleclose
+	   vertopen
+	   vertclose
+	   horzopen
+	   horzclose
+	   dissolve
+	   pixelize
+	   diagtl
+	   diagtr
+	   diagbl
+	   diagbr
+	   hlslice
+	   hrslice
+	   vuslice
+	   vdslice
+	   hblur
+	   fadegrays
+	   wipetl
+	   wipetr
+	   wipebl
+	   wipebr
+	   squeezeh
+	   squeezev
+	   zoomin
+	   fadefast
+	   fadeslow
+	   hlwind
+	   hrwind
+	   vuwind
+	   vdwind
+	   coverleft
+	   coverright
+	   coverup
+	   coverdown
+	   revealleft
+	   revealright
+	   revealup
+	   revealdown
+
+	   Default transition effect is fade.
+
+       duration
+	   Set cross fade duration in seconds.	Range is 0 to 60 seconds.
+	   Default duration is 1 second.
+
+       offset
+	   Set cross fade start relative to first input stream in seconds.
+	   Default offset is 0.
+
+       expr
+	   Set expression for custom transition effect.
+
+	   The expressions can use the following variables and functions:
+
+	   X
+	   Y   The coordinates of the current sample.
+
+	   W
+	   H   The width and height of the image.
+
+	   P   Progress of transition effect.
+
+	   PLANE
+	       Currently processed plane.
+
+	   A   Return value of first input at current location and plane.
+
+	   B   Return value of second input at current location and plane.
+
+	   a0(x, y)
+	   a1(x, y)
+	   a2(x, y)
+	   a3(x, y)
+	       Return the value of the pixel at location (x,y) of the
+	       first/second/third/fourth component of first input.
+
+	   b0(x, y)
+	   b1(x, y)
+	   b2(x, y)
+	   b3(x, y)
+	       Return the value of the pixel at location (x,y) of the
+	       first/second/third/fourth component of second input.
+
+       Examples
+
+       o   Cross fade from one input video to another input video, with fade
+	   transition and duration of transition of 2 seconds starting at
+	   offset of 5 seconds:
+
+		   ffmpeg -i first.mp4 -i second.mp4 -filter_complex xfade=transition=fade:duration=2:offset=5 output.mp4
+
+   xmedian
+       Pick median pixels from several input videos.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of inputs.  Default is 3. Allowed range is from 3 to
+	   255.  If number of inputs is even number, than result will be mean
+	   value between two median values.
+
+       planes
+	   Set which planes to filter. Default value is 15, by which all
+	   planes are processed.
+
+       percentile
+	   Set median percentile. Default value is 0.5.  Default value of 0.5
+	   will pick always median values, while 0 will pick minimum values,
+	   and 1 maximum values.
+
+       Commands
+
+       This filter supports all above options as commands, excluding option
+       "inputs".
+
+   xstack
+       Stack video inputs into custom layout.
+
+       All streams must be of same pixel format.
+
+       The filter accepts the following options:
+
+       inputs
+	   Set number of input streams. Default is 2.
+
+       layout
+	   Specify layout of inputs.  This option requires the desired layout
+	   configuration to be explicitly set by the user.  This sets position
+	   of each video input in output. Each input is separated by '|'.  The
+	   first number represents the column, and the second number
+	   represents the row.	Numbers start at 0 and are separated by '_'.
+	   Optionally one can use wX and hX, where X is video input from which
+	   to take width or height.  Multiple values can be used when
+	   separated by '+'. In such case values are summed together.
+
+	   Note that if inputs are of different sizes gaps may appear, as not
+	   all of the output video frame will be filled. Similarly, videos can
+	   overlap each other if their position doesn't leave enough space for
+	   the full frame of adjoining videos.
+
+	   For 2 inputs, a default layout of "0_0|w0_0" (equivalent to
+	   "grid=2x1") is set. In all other cases, a layout or a grid must be
+	   set by the user. Either "grid" or "layout" can be specified at a
+	   time.  Specifying both will result in an error.
+
+       grid
+	   Specify a fixed size grid of inputs.  This option is used to create
+	   a fixed size grid of the input streams. Set the grid size in the
+	   form "COLUMNSxROWS". There must be "ROWS * COLUMNS" input streams
+	   and they will be arranged as a grid with "ROWS" rows and "COLUMNS"
+	   columns. When using this option, each input stream within a row
+	   must have the same height and all the rows must have the same
+	   width.
+
+	   If "grid" is set, then "inputs" option is ignored and is implicitly
+	   set to "ROWS * COLUMNS".
+
+	   For 2 inputs, a default grid of "2x1" (equivalent to
+	   "layout=0_0|w0_0") is set. In all other cases, a layout or a grid
+	   must be set by the user. Either "grid" or "layout" can be specified
+	   at a time.  Specifying both will result in an error.
+
+       shortest
+	   If set to 1, force the output to terminate when the shortest input
+	   terminates. Default value is 0.
+
+       fill
+	   If set to valid color, all unused pixels will be filled with that
+	   color.  By default fill is set to none, so it is disabled.
+
+       Examples
+
+       o   Display 4 inputs into 2x2 grid.
+
+	   Layout:
+
+		   input1(0, 0)  | input3(w0, 0)
+		   input2(0, h0) | input4(w0, h0)
+
+		   xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0
+
+	   Note that if inputs are of different sizes, gaps or overlaps may
+	   occur.
+
+       o   Display 4 inputs into 1x4 grid.
+
+	   Layout:
+
+		   input1(0, 0)
+		   input2(0, h0)
+		   input3(0, h0+h1)
+		   input4(0, h0+h1+h2)
+
+		   xstack=inputs=4:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2
+
+	   Note that if inputs are of different widths, unused space will
+	   appear.
+
+       o   Display 9 inputs into 3x3 grid.
+
+	   Layout:
+
+		   input1(0, 0)       | input4(w0, 0)	   | input7(w0+w3, 0)
+		   input2(0, h0)      | input5(w0, h0)	   | input8(w0+w3, h0)
+		   input3(0, h0+h1)   | input6(w0, h0+h1)  | input9(w0+w3, h0+h1)
+
+		   xstack=inputs=9:layout=0_0|0_h0|0_h0+h1|w0_0|w0_h0|w0_h0+h1|w0+w3_0|w0+w3_h0|w0+w3_h0+h1
+
+	   Note that if inputs are of different sizes, gaps or overlaps may
+	   occur.
+
+       o   Display 16 inputs into 4x4 grid.
+
+	   Layout:
+
+		   input1(0, 0)       | input5(w0, 0)	    | input9 (w0+w4, 0)       | input13(w0+w4+w8, 0)
+		   input2(0, h0)      | input6(w0, h0)	    | input10(w0+w4, h0)      | input14(w0+w4+w8, h0)
+		   input3(0, h0+h1)   | input7(w0, h0+h1)   | input11(w0+w4, h0+h1)   | input15(w0+w4+w8, h0+h1)
+		   input4(0, h0+h1+h2)| input8(w0, h0+h1+h2)| input12(w0+w4, h0+h1+h2)| input16(w0+w4+w8, h0+h1+h2)
+
+		   xstack=inputs=16:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2|w0_0|w0_h0|w0_h0+h1|w0_h0+h1+h2|w0+w4_0|
+		   w0+w4_h0|w0+w4_h0+h1|w0+w4_h0+h1+h2|w0+w4+w8_0|w0+w4+w8_h0|w0+w4+w8_h0+h1|w0+w4+w8_h0+h1+h2
+
+	   Note that if inputs are of different sizes, gaps or overlaps may
+	   occur.
+
+   yadif
+       Deinterlace the input video ("yadif" means "yet another deinterlacing
+       filter").
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   2, send_frame_nospatial
+	       Like "send_frame", but it skips the spatial interlacing check.
+
+	   3, send_field_nospatial
+	       Like "send_field", but it skips the spatial interlacing check.
+
+	   The default value is "send_frame".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   yadif_cuda
+       Deinterlace the input video using the yadif algorithm, but implemented
+       in CUDA so that it can work as part of a GPU accelerated pipeline with
+       nvdec and/or nvenc.
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   2, send_frame_nospatial
+	       Like "send_frame", but it skips the spatial interlacing check.
+
+	   3, send_field_nospatial
+	       Like "send_field", but it skips the spatial interlacing check.
+
+	   The default value is "send_frame".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   yaepblur
+       Apply blur filter while preserving edges ("yaepblur" means "yet another
+       edge preserving blur filter").  The algorithm is described in "J. S.
+       Lee, Digital image enhancement and noise filtering by use of local
+       statistics, IEEE Trans. Pattern Anal. Mach. Intell. PAMI-2, 1980."
+
+       It accepts the following parameters:
+
+       radius, r
+	   Set the window radius. Default value is 3.
+
+       planes, p
+	   Set which planes to filter. Default is only the first plane.
+
+       sigma, s
+	   Set blur strength. Default value is 128.
+
+       Commands
+
+       This filter supports same commands as options.
+
+   zoompan
+       Apply Zoom & Pan effect.
+
+       This filter accepts the following options:
+
+       zoom, z
+	   Set the zoom expression. Range is 1-10. Default is 1.
+
+       x
+       y   Set the x and y expression. Default is 0.
+
+       d   Set the duration expression in number of frames.  This sets for how
+	   many number of frames effect will last for single input image.
+	   Default is 90.
+
+       s   Set the output image size, default is 'hd720'.
+
+       fps Set the output frame rate, default is '25'.
+
+       Each expression can contain the following constants:
+
+       in_w, iw
+	   Input width.
+
+       in_h, ih
+	   Input height.
+
+       out_w, ow
+	   Output width.
+
+       out_h, oh
+	   Output height.
+
+       in  Input frame count.
+
+       on  Output frame count.
+
+       in_time, it
+	   The input timestamp expressed in seconds. It's NAN if the input
+	   timestamp is unknown.
+
+       out_time, time, ot
+	   The output timestamp expressed in seconds.
+
+       x
+       y   Last calculated 'x' and 'y' position from 'x' and 'y' expression
+	   for current input frame.
+
+       px
+       py  'x' and 'y' of last output frame of previous input frame or 0 when
+	   there was not yet such frame (first input frame).
+
+       zoom
+	   Last calculated zoom from 'z' expression for current input frame.
+
+       pzoom
+	   Last calculated zoom of last output frame of previous input frame.
+
+       duration
+	   Number of output frames for current input frame. Calculated from
+	   'd' expression for each input frame.
+
+       pduration
+	   number of output frames created for previous input frame
+
+       a   Rational number: input width / input height
+
+       sar sample aspect ratio
+
+       dar display aspect ratio
+
+       Examples
+
+       o   Zoom in up to 1.5x and pan at same time to some spot near center of
+	   picture:
+
+		   zoompan=z='min(zoom+0.0015,1.5)':d=700:x='if(gte(zoom,1.5),x,x+1/a)':y='if(gte(zoom,1.5),y,y+1)':s=640x360
+
+       o   Zoom in up to 1.5x and pan always at center of picture:
+
+		   zoompan=z='min(zoom+0.0015,1.5)':d=700:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
+
+       o   Same as above but without pausing:
+
+		   zoompan=z='min(max(zoom,pzoom)+0.0015,1.5)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
+
+       o   Zoom in 2x into center of picture only for the first second of the
+	   input video:
+
+		   zoompan=z='if(between(in_time,0,1),2,1)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)'
+
+   zscale
+       Scale (resize) the input video, using the z.lib library:
+       <https://github.com/sekrit-twc/zimg>. To enable compilation of this
+       filter, you need to configure FFmpeg with "--enable-libzimg".
+
+       The zscale filter forces the output display aspect ratio to be the same
+       as the input, by changing the output sample aspect ratio.
+
+       If the input image format is different from the format requested by the
+       next filter, the zscale filter will convert the input to the requested
+       format.
+
+       Options
+
+       The filter accepts the following options.
+
+       width, w
+       height, h
+	   Set the output video dimension expression. Default value is the
+	   input dimension.
+
+	   If the width or w value is 0, the input width is used for the
+	   output. If the height or h value is 0, the input height is used for
+	   the output.
+
+	   If one and only one of the values is -n with n >= 1, the zscale
+	   filter will use a value that maintains the aspect ratio of the
+	   input image, calculated from the other specified dimension. After
+	   that it will, however, make sure that the calculated dimension is
+	   divisible by n and adjust the value if necessary.
+
+	   If both values are -n with n >= 1, the behavior will be identical
+	   to both values being set to 0 as previously detailed.
+
+	   See below for the list of accepted constants for use in the
+	   dimension expression.
+
+       size, s
+	   Set the video size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual.
+
+       dither, d
+	   Set the dither type.
+
+	   Possible values are:
+
+	   none
+	   ordered
+	   random
+	   error_diffusion
+
+	   Default is none.
+
+       filter, f
+	   Set the resize filter type.
+
+	   Possible values are:
+
+	   point
+	   bilinear
+	   bicubic
+	   spline16
+	   spline36
+	   lanczos
+
+	   Default is bilinear.
+
+       range, r
+	   Set the color range.
+
+	   Possible values are:
+
+	   input
+	   limited
+	   full
+
+	   Default is same as input.
+
+       primaries, p
+	   Set the color primaries.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   170m
+	   240m
+	   2020
+
+	   Default is same as input.
+
+       transfer, t
+	   Set the transfer characteristics.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   601
+	   linear
+	   2020_10
+	   2020_12
+	   smpte2084
+	   iec61966-2-1
+	   arib-std-b67
+
+	   Default is same as input.
+
+       matrix, m
+	   Set the colorspace matrix.
+
+	   Possible value are:
+
+	   input
+	   709
+	   unspecified
+	   470bg
+	   170m
+	   2020_ncl
+	   2020_cl
+
+	   Default is same as input.
+
+       rangein, rin
+	   Set the input color range.
+
+	   Possible values are:
+
+	   input
+	   limited
+	   full
+
+	   Default is same as input.
+
+       primariesin, pin
+	   Set the input color primaries.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   170m
+	   240m
+	   2020
+
+	   Default is same as input.
+
+       transferin, tin
+	   Set the input transfer characteristics.
+
+	   Possible values are:
+
+	   input
+	   709
+	   unspecified
+	   601
+	   linear
+	   2020_10
+	   2020_12
+
+	   Default is same as input.
+
+       matrixin, min
+	   Set the input colorspace matrix.
+
+	   Possible value are:
+
+	   input
+	   709
+	   unspecified
+	   470bg
+	   170m
+	   2020_ncl
+	   2020_cl
+       chromal, c
+	   Set the output chroma location.
+
+	   Possible values are:
+
+	   input
+	   left
+	   center
+	   topleft
+	   top
+	   bottomleft
+	   bottom
+       chromalin, cin
+	   Set the input chroma location.
+
+	   Possible values are:
+
+	   input
+	   left
+	   center
+	   topleft
+	   top
+	   bottomleft
+	   bottom
+       npl Set the nominal peak luminance.
+
+       param_a
+	   Parameter A for scaling filters. Parameter "b" for bicubic, and the
+	   number of filter taps for lanczos.
+
+       param_b
+	   Parameter B for scaling filters. Parameter "c" for bicubic.
+
+       The values of the w and h options are expressions containing the
+       following constants:
+
+       in_w
+       in_h
+	   The input width and height
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output (scaled) width and height
+
+       ow
+       oh  These are the same as out_w and out_h
+
+       a   The same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar The input display aspect ratio. Calculated from "(iw / ih) * sar".
+
+       hsub
+       vsub
+	   horizontal and vertical input chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       ohsub
+       ovsub
+	   horizontal and vertical output chroma subsample values. For example
+	   for the pixel format "yuv422p" hsub is 2 and vsub is 1.
+
+       Commands
+
+       This filter supports the following commands:
+
+       width, w
+       height, h
+	   Set the output video dimension expression.  The command accepts the
+	   same syntax of the corresponding option.
+
+	   If the specified expression is not valid, it is kept at its current
+	   value.
+
+OPENCL VIDEO FILTERS
+       Below is a description of the currently available OpenCL video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-opencl".
+
+       Running OpenCL filters requires you to initialize a hardware device and
+       to pass that device to all filters in any filter graph.
+
+       -init_hw_device opencl[=name][:device[,key=value...]]
+	   Initialise a new hardware device of type opencl called name, using
+	   the given device parameters.
+
+       -filter_hw_device name
+	   Pass the hardware device called name to all filters in any filter
+	   graph.
+
+       For more detailed information see
+       <https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options>
+
+       o   Example of choosing the first device on the second platform and
+	   running avgblur_opencl filter with default parameters on it.
+
+		   -init_hw_device opencl=gpu:1.0 -filter_hw_device gpu -i INPUT -vf "hwupload, avgblur_opencl, hwdownload" OUTPUT
+
+       Since OpenCL filters are not able to access frame data in normal
+       memory, all frame data needs to be uploaded(hwupload) to hardware
+       surfaces connected to the appropriate device before being used and then
+       downloaded(hwdownload) back to normal memory. Note that hwupload will
+       upload to a surface with the same layout as the software frame, so it
+       may be necessary to add a format filter immediately before to get the
+       input into the right format and hwdownload does not support all formats
+       on the output - it may be necessary to insert an additional format
+       filter immediately following in the graph to get the output in a
+       supported format.
+
+   avgblur_opencl
+       Apply average blur filter.
+
+       The filter accepts the following options:
+
+       sizeX
+	   Set horizontal radius size.	Range is "[1, 1024]" and default value
+	   is 1.
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       sizeY
+	   Set vertical radius size. Range is "[1, 1024]" and default value is
+	   0. If zero, "sizeX" value will be used.
+
+       Example
+
+       o   Apply average blur filter with horizontal and vertical size of 3,
+	   setting each pixel of the output to the average value of the 7x7
+	   region centered on it in the input. For pixels on the edges of the
+	   image, the region does not extend beyond the image boundaries, and
+	   so out-of-range coordinates are not used in the calculations.
+
+		   -i INPUT -vf "hwupload, avgblur_opencl=3, hwdownload" OUTPUT
+
+   boxblur_opencl
+       Apply a boxblur algorithm to the input video.
+
+       It accepts the following parameters:
+
+       luma_radius, lr
+       luma_power, lp
+       chroma_radius, cr
+       chroma_power, cp
+       alpha_radius, ar
+       alpha_power, ap
+
+       A description of the accepted options follows.
+
+       luma_radius, lr
+       chroma_radius, cr
+       alpha_radius, ar
+	   Set an expression for the box radius in pixels used for blurring
+	   the corresponding input plane.
+
+	   The radius value must be a non-negative number, and must not be
+	   greater than the value of the expression "min(w,h)/2" for the luma
+	   and alpha planes, and of "min(cw,ch)/2" for the chroma planes.
+
+	   Default value for luma_radius is "2". If not specified,
+	   chroma_radius and alpha_radius default to the corresponding value
+	   set for luma_radius.
+
+	   The expressions can contain the following constants:
+
+	   w
+	   h   The input width and height in pixels.
+
+	   cw
+	   ch  The input chroma image width and height in pixels.
+
+	   hsub
+	   vsub
+	       The horizontal and vertical chroma subsample values. For
+	       example, for the pixel format "yuv422p", hsub is 2 and vsub is
+	       1.
+
+       luma_power, lp
+       chroma_power, cp
+       alpha_power, ap
+	   Specify how many times the boxblur filter is applied to the
+	   corresponding plane.
+
+	   Default value for luma_power is 2. If not specified, chroma_power
+	   and alpha_power default to the corresponding value set for
+	   luma_power.
+
+	   A value of 0 will disable the effect.
+
+       Examples
+
+       Apply boxblur filter, setting each pixel of the output to the average
+       value of box-radiuses luma_radius, chroma_radius, alpha_radius for each
+       plane respectively. The filter will apply luma_power, chroma_power,
+       alpha_power times onto the corresponding plane. For pixels on the edges
+       of the image, the radius does not extend beyond the image boundaries,
+       and so out-of-range coordinates are not used in the calculations.
+
+       o   Apply a boxblur filter with the luma, chroma, and alpha radius set
+	   to 2 and luma, chroma, and alpha power set to 3. The filter will
+	   run 3 times with box-radius set to 2 for every plane of the image.
+
+		   -i INPUT -vf "hwupload, boxblur_opencl=luma_radius=2:luma_power=3, hwdownload" OUTPUT
+		   -i INPUT -vf "hwupload, boxblur_opencl=2:3, hwdownload" OUTPUT
+
+       o   Apply a boxblur filter with luma radius set to 2, luma_power to 1,
+	   chroma_radius to 4, chroma_power to 5, alpha_radius to 3 and
+	   alpha_power to 7.
+
+	   For the luma plane, a 2x2 box radius will be run once.
+
+	   For the chroma plane, a 4x4 box radius will be run 5 times.
+
+	   For the alpha plane, a 3x3 box radius will be run 7 times.
+
+		   -i INPUT -vf "hwupload, boxblur_opencl=2:1:4:5:3:7, hwdownload" OUTPUT
+
+   colorkey_opencl
+       RGB colorspace color keying.
+
+       The filter accepts the following options:
+
+       color
+	   The color which will be replaced with transparency.
+
+       similarity
+	   Similarity percentage with the key color.
+
+	   0.01 matches only the exact key color, while 1.0 matches
+	   everything.
+
+       blend
+	   Blend percentage.
+
+	   0.0 makes pixels either fully transparent, or not transparent at
+	   all.
+
+	   Higher values result in semi-transparent pixels, with a higher
+	   transparency the more similar the pixels color is to the key color.
+
+       Examples
+
+       o   Make every semi-green pixel in the input transparent with some
+	   slight blending:
+
+		   -i INPUT -vf "hwupload, colorkey_opencl=green:0.3:0.1, hwdownload" OUTPUT
+
+   convolution_opencl
+       Apply convolution of 3x3, 5x5, 7x7 matrix.
+
+       The filter accepts the following options:
+
+       0m
+       1m
+       2m
+       3m  Set matrix for each plane.  Matrix is sequence of 9, 25 or 49
+	   signed numbers.  Default value for each plane is "0 0 0 0 1 0 0 0
+	   0".
+
+       0rdiv
+       1rdiv
+       2rdiv
+       3rdiv
+	   Set multiplier for calculated value for each plane.	If unset or 0,
+	   it will be sum of all matrix elements.  The option value must be a
+	   float number greater or equal to 0.0. Default value is 1.0.
+
+       0bias
+       1bias
+       2bias
+       3bias
+	   Set bias for each plane. This value is added to the result of the
+	   multiplication.  Useful for making the overall image brighter or
+	   darker.  The option value must be a float number greater or equal
+	   to 0.0. Default value is 0.0.
+
+       Examples
+
+       o   Apply sharpen:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0, hwdownload" OUTPUT
+
+       o   Apply blur:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1/9:1/9:1/9:1/9, hwdownload" OUTPUT
+
+       o   Apply edge enhance:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128, hwdownload" OUTPUT
+
+       o   Apply edge detect:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128, hwdownload" OUTPUT
+
+       o   Apply laplacian edge detector which includes diagonals:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:1 1 1 1 -8 1 1 1 1:5:5:5:1:0:128:128:0, hwdownload" OUTPUT
+
+       o   Apply emboss:
+
+		   -i INPUT -vf "hwupload, convolution_opencl=-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2, hwdownload" OUTPUT
+
+   erosion_opencl
+       Apply erosion effect to the video.
+
+       This filter replaces the pixel by the local(3x3) minimum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane. Range is "[0, 65535]" and
+	   default value is 65535.  If 0, plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to.	Range is "[0, 255]"
+	   and default value is 255, i.e. all eight pixels are used.
+
+	   Flags to local 3x3 coordinates region centered on "x":
+
+	       1 2 3
+
+	       4 x 5
+
+	       6 7 8
+
+       Example
+
+       o   Apply erosion filter with threshold0 set to 30, threshold1 set 40,
+	   threshold2 set to 50 and coordinates set to 231, setting each pixel
+	   of the output to the local minimum between pixels: 1, 2, 3, 6, 7, 8
+	   of the 3x3 region centered on it in the input. If the difference
+	   between input pixel and local minimum is more then threshold of the
+	   corresponding plane, output pixel will be set to input pixel -
+	   threshold of corresponding plane.
+
+		   -i INPUT -vf "hwupload, erosion_opencl=30:40:50:coordinates=231, hwdownload" OUTPUT
+
+   deshake_opencl
+       Feature-point based video stabilization filter.
+
+       The filter accepts the following options:
+
+       tripod
+	   Simulates a tripod by preventing any camera movement whatsoever
+	   from the original frame. Defaults to 0.
+
+       debug
+	   Whether or not additional debug info should be displayed, both in
+	   the processed output and in the console.
+
+	   Note that in order to see console debug output you will also need
+	   to pass "-v verbose" to ffmpeg.
+
+	   Viewing point matches in the output video is only supported for RGB
+	   input.
+
+	   Defaults to 0.
+
+       adaptive_crop
+	   Whether or not to do a tiny bit of cropping at the borders to cut
+	   down on the amount of mirrored pixels.
+
+	   Defaults to 1.
+
+       refine_features
+	   Whether or not feature points should be refined at a sub-pixel
+	   level.
+
+	   This can be turned off for a slight performance gain at the cost of
+	   precision.
+
+	   Defaults to 1.
+
+       smooth_strength
+	   The strength of the smoothing applied to the camera path from 0.0
+	   to 1.0.
+
+	   1.0 is the maximum smoothing strength while values less than that
+	   result in less smoothing.
+
+	   0.0 causes the filter to adaptively choose a smoothing strength on
+	   a per-frame basis.
+
+	   Defaults to 0.0.
+
+       smooth_window_multiplier
+	   Controls the size of the smoothing window (the number of frames
+	   buffered to determine motion information from).
+
+	   The size of the smoothing window is determined by multiplying the
+	   framerate of the video by this number.
+
+	   Acceptable values range from 0.1 to 10.0.
+
+	   Larger values increase the amount of motion data available for
+	   determining how to smooth the camera path, potentially improving
+	   smoothness, but also increase latency and memory usage.
+
+	   Defaults to 2.0.
+
+       Examples
+
+       o   Stabilize a video with a fixed, medium smoothing strength:
+
+		   -i INPUT -vf "hwupload, deshake_opencl=smooth_strength=0.5, hwdownload" OUTPUT
+
+       o   Stabilize a video with debugging (both in console and in rendered
+	   video):
+
+		   -i INPUT -filter_complex "[0:v]format=rgba, hwupload, deshake_opencl=debug=1, hwdownload, format=rgba, format=yuv420p" -v verbose OUTPUT
+
+   dilation_opencl
+       Apply dilation effect to the video.
+
+       This filter replaces the pixel by the local(3x3) maximum.
+
+       It accepts the following options:
+
+       threshold0
+       threshold1
+       threshold2
+       threshold3
+	   Limit the maximum change for each plane. Range is "[0, 65535]" and
+	   default value is 65535.  If 0, plane will remain unchanged.
+
+       coordinates
+	   Flag which specifies the pixel to refer to.	Range is "[0, 255]"
+	   and default value is 255, i.e. all eight pixels are used.
+
+	   Flags to local 3x3 coordinates region centered on "x":
+
+	       1 2 3
+
+	       4 x 5
+
+	       6 7 8
+
+       Example
+
+       o   Apply dilation filter with threshold0 set to 30, threshold1 set 40,
+	   threshold2 set to 50 and coordinates set to 231, setting each pixel
+	   of the output to the local maximum between pixels: 1, 2, 3, 6, 7, 8
+	   of the 3x3 region centered on it in the input. If the difference
+	   between input pixel and local maximum is more then threshold of the
+	   corresponding plane, output pixel will be set to input pixel +
+	   threshold of corresponding plane.
+
+		   -i INPUT -vf "hwupload, dilation_opencl=30:40:50:coordinates=231, hwdownload" OUTPUT
+
+   nlmeans_opencl
+       Non-local Means denoise filter through OpenCL, this filter accepts same
+       options as nlmeans.
+
+   overlay_opencl
+       Overlay one video on top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.  This filter requires same
+       memory layout for all the inputs. So, format conversion may be needed.
+
+       The filter accepts the following options:
+
+       x   Set the x coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+       y   Set the y coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+       Examples
+
+       o   Overlay an image LOGO at the top-left corner of the INPUT video.
+	   Both inputs are yuv420p format.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuv420p, hwupload[b], [a][b]overlay_opencl, hwdownload" OUTPUT
+
+       o   The inputs have same memory layout for color channels , the overlay
+	   has additional alpha plane, like INPUT is yuv420p, and the LOGO is
+	   yuva420p.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuva420p, hwupload[b], [a][b]overlay_opencl, hwdownload" OUTPUT
+
+   pad_opencl
+       Add paddings to the input image, and place the original input at the
+       provided x, y coordinates.
+
+       It accepts the following options:
+
+       width, w
+       height, h
+	   Specify an expression for the size of the output image with the
+	   paddings added. If the value for width or height is 0, the
+	   corresponding input size is used for the output.
+
+	   The width expression can reference the value set by the height
+	   expression, and vice versa.
+
+	   The default value of width and height is 0.
+
+       x
+       y   Specify the offsets to place the input image at within the padded
+	   area, with respect to the top/left border of the output image.
+
+	   The x expression can reference the value set by the y expression,
+	   and vice versa.
+
+	   The default value of x and y is 0.
+
+	   If x or y evaluate to a negative number, they'll be changed so the
+	   input image is centered on the padded area.
+
+       color
+	   Specify the color of the padded area. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+
+       aspect
+	   Pad to an aspect instead to a resolution.
+
+       The value for the width, height, x, and y options are expressions
+       containing the following constants:
+
+       in_w
+       in_h
+	   The input video width and height.
+
+       iw
+       ih  These are the same as in_w and in_h.
+
+       out_w
+       out_h
+	   The output width and height (the size of the padded area), as
+	   specified by the width and height expressions.
+
+       ow
+       oh  These are the same as out_w and out_h.
+
+       x
+       y   The x and y offsets as specified by the x and y expressions, or NAN
+	   if not yet specified.
+
+       a   same as iw / ih
+
+       sar input sample aspect ratio
+
+       dar input display aspect ratio, it is the same as (iw / ih) * sar
+
+   prewitt_opencl
+       Apply the Prewitt operator
+       (<https://en.wikipedia.org/wiki/Prewitt_operator>) to input video
+       stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.  Range is
+	   "[0.0, 65535]" and default value is 1.0.
+
+       delta
+	   Set value which will be added to filtered result.  Range is
+	   "[-65535, 65535]" and default value is 0.0.
+
+       Example
+
+       o   Apply the Prewitt operator with scale set to 2 and delta set to 10.
+
+		   -i INPUT -vf "hwupload, prewitt_opencl=scale=2:delta=10, hwdownload" OUTPUT
+
+   program_opencl
+       Filter video using an OpenCL program.
+
+       source
+	   OpenCL program source file.
+
+       kernel
+	   Kernel name in program.
+
+       inputs
+	   Number of inputs to the filter.  Defaults to 1.
+
+       size, s
+	   Size of output frames.  Defaults to the same as the first input.
+
+       The "program_opencl" filter also supports the framesync options.
+
+       The program source file must contain a kernel function with the given
+       name, which will be run once for each plane of the output.  Each run on
+       a plane gets enqueued as a separate 2D global NDRange with one work-
+       item for each pixel to be generated.  The global ID offset for each
+       work-item is therefore the coordinates of a pixel in the destination
+       image.
+
+       The kernel function needs to take the following arguments:
+
+       o   Destination image, __write_only image2d_t.
+
+	   This image will become the output; the kernel should write all of
+	   it.
+
+       o   Frame index, unsigned int.
+
+	   This is a counter starting from zero and increasing by one for each
+	   frame.
+
+       o   Source images, __read_only image2d_t.
+
+	   These are the most recent images on each input.  The kernel may
+	   read from them to generate the output, but they can't be written
+	   to.
+
+       Example programs:
+
+       o   Copy the input to the output (output must be the same size as the
+	   input).
+
+		   __kernel void copy(__write_only image2d_t destination,
+				      unsigned int index,
+				      __read_only  image2d_t source)
+		   {
+		       const sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE;
+
+		       int2 location = (int2)(get_global_id(0), get_global_id(1));
+
+		       float4 value = read_imagef(source, sampler, location);
+
+		       write_imagef(destination, location, value);
+		   }
+
+       o   Apply a simple transformation, rotating the input by an amount
+	   increasing with the index counter.  Pixel values are linearly
+	   interpolated by the sampler, and the output need not have the same
+	   dimensions as the input.
+
+		   __kernel void rotate_image(__write_only image2d_t dst,
+					      unsigned int index,
+					      __read_only  image2d_t src)
+		   {
+		       const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+						  CLK_FILTER_LINEAR);
+
+		       float angle = (float)index / 100.0f;
+
+		       float2 dst_dim = convert_float2(get_image_dim(dst));
+		       float2 src_dim = convert_float2(get_image_dim(src));
+
+		       float2 dst_cen = dst_dim / 2.0f;
+		       float2 src_cen = src_dim / 2.0f;
+
+		       int2   dst_loc = (int2)(get_global_id(0), get_global_id(1));
+
+		       float2 dst_pos = convert_float2(dst_loc) - dst_cen;
+		       float2 src_pos = {
+			   cos(angle) * dst_pos.x - sin(angle) * dst_pos.y,
+			   sin(angle) * dst_pos.x + cos(angle) * dst_pos.y
+		       };
+		       src_pos = src_pos * src_dim / dst_dim;
+
+		       float2 src_loc = src_pos + src_cen;
+
+		       if (src_loc.x < 0.0f	 || src_loc.y < 0.0f ||
+			   src_loc.x > src_dim.x || src_loc.y > src_dim.y)
+			   write_imagef(dst, dst_loc, 0.5f);
+		       else
+			   write_imagef(dst, dst_loc, read_imagef(src, sampler, src_loc));
+		   }
+
+       o   Blend two inputs together, with the amount of each input used
+	   varying with the index counter.
+
+		   __kernel void blend_images(__write_only image2d_t dst,
+					      unsigned int index,
+					      __read_only  image2d_t src1,
+					      __read_only  image2d_t src2)
+		   {
+		       const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+						  CLK_FILTER_LINEAR);
+
+		       float blend = (cos((float)index / 50.0f) + 1.0f) / 2.0f;
+
+		       int2  dst_loc = (int2)(get_global_id(0), get_global_id(1));
+		       int2 src1_loc = dst_loc * get_image_dim(src1) / get_image_dim(dst);
+		       int2 src2_loc = dst_loc * get_image_dim(src2) / get_image_dim(dst);
+
+		       float4 val1 = read_imagef(src1, sampler, src1_loc);
+		       float4 val2 = read_imagef(src2, sampler, src2_loc);
+
+		       write_imagef(dst, dst_loc, val1 * blend + val2 * (1.0f - blend));
+		   }
+
+   remap_opencl
+       Remap pixels using 2nd: Xmap and 3rd: Ymap input video stream.
+
+       Destination pixel at position (X, Y) will be picked from source (x, y)
+       position where x = Xmap(X, Y) and y = Ymap(X, Y). If mapping values are
+       out of range, zero value for pixel will be used for destination pixel.
+
+       Xmap and Ymap input video streams must be of same dimensions. Output
+       video stream will have Xmap/Ymap video stream dimensions.  Xmap and
+       Ymap input video streams are 32bit float pixel format, single channel.
+
+       interp
+	   Specify interpolation used for remapping of pixels.	Allowed values
+	   are "near" and "linear".  Default value is "linear".
+
+       fill
+	   Specify the color of the unmapped pixels. For the syntax of this
+	   option, check the "Color" section in the ffmpeg-utils manual.
+	   Default color is "black".
+
+   roberts_opencl
+       Apply the Roberts cross operator
+       (<https://en.wikipedia.org/wiki/Roberts_cross>) to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.  Range is
+	   "[0.0, 65535]" and default value is 1.0.
+
+       delta
+	   Set value which will be added to filtered result.  Range is
+	   "[-65535, 65535]" and default value is 0.0.
+
+       Example
+
+       o   Apply the Roberts cross operator with scale set to 2 and delta set
+	   to 10
+
+		   -i INPUT -vf "hwupload, roberts_opencl=scale=2:delta=10, hwdownload" OUTPUT
+
+   sobel_opencl
+       Apply the Sobel operator
+       (<https://en.wikipedia.org/wiki/Sobel_operator>) to input video stream.
+
+       The filter accepts the following option:
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+       scale
+	   Set value which will be multiplied with filtered result.  Range is
+	   "[0.0, 65535]" and default value is 1.0.
+
+       delta
+	   Set value which will be added to filtered result.  Range is
+	   "[-65535, 65535]" and default value is 0.0.
+
+       Example
+
+       o   Apply sobel operator with scale set to 2 and delta set to 10
+
+		   -i INPUT -vf "hwupload, sobel_opencl=scale=2:delta=10, hwdownload" OUTPUT
+
+   tonemap_opencl
+       Perform HDR(PQ/HLG) to SDR conversion with tone-mapping.
+
+       It accepts the following parameters:
+
+       tonemap
+	   Specify the tone-mapping operator to be used. Same as tonemap
+	   option in tonemap.
+
+       param
+	   Tune the tone mapping algorithm. same as param option in tonemap.
+
+       desat
+	   Apply desaturation for highlights that exceed this level of
+	   brightness. The higher the parameter, the more color information
+	   will be preserved. This setting helps prevent unnaturally blown-out
+	   colors for super-highlights, by (smoothly) turning into white
+	   instead. This makes images feel more natural, at the cost of
+	   reducing information about out-of-range colors.
+
+	   The default value is 0.5, and the algorithm here is a little
+	   different from the cpu version tonemap currently. A setting of 0.0
+	   disables this option.
+
+       threshold
+	   The tonemapping algorithm parameters is fine-tuned per each scene.
+	   And a threshold is used to detect whether the scene has changed or
+	   not. If the distance between the current frame average brightness
+	   and the current running average exceeds a threshold value, we would
+	   re-calculate scene average and peak brightness.  The default value
+	   is 0.2.
+
+       format
+	   Specify the output pixel format.
+
+	   Currently supported formats are:
+
+	   p010
+	   nv12
+       range, r
+	   Set the output color range.
+
+	   Possible values are:
+
+	   tv/mpeg
+	   pc/jpeg
+
+	   Default is same as input.
+
+       primaries, p
+	   Set the output color primaries.
+
+	   Possible values are:
+
+	   bt709
+	   bt2020
+
+	   Default is same as input.
+
+       transfer, t
+	   Set the output transfer characteristics.
+
+	   Possible values are:
+
+	   bt709
+	   bt2020
+
+	   Default is bt709.
+
+       matrix, m
+	   Set the output colorspace matrix.
+
+	   Possible value are:
+
+	   bt709
+	   bt2020
+
+	   Default is same as input.
+
+       Example
+
+       o   Convert HDR(PQ/HLG) video to bt2020-transfer-characteristic p010
+	   format using linear operator.
+
+		   -i INPUT -vf "format=p010,hwupload,tonemap_opencl=t=bt2020:tonemap=linear:format=p010,hwdownload,format=p010" OUTPUT
+
+   unsharp_opencl
+       Sharpen or blur the input video.
+
+       It accepts the following parameters:
+
+       luma_msize_x, lx
+	   Set the luma matrix horizontal size.  Range is "[1, 23]" and
+	   default value is 5.
+
+       luma_msize_y, ly
+	   Set the luma matrix vertical size.  Range is "[1, 23]" and default
+	   value is 5.
+
+       luma_amount, la
+	   Set the luma effect strength.  Range is "[-10, 10]" and default
+	   value is 1.0.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+       chroma_msize_x, cx
+	   Set the chroma matrix horizontal size.  Range is "[1, 23]" and
+	   default value is 5.
+
+       chroma_msize_y, cy
+	   Set the chroma matrix vertical size.  Range is "[1, 23]" and
+	   default value is 5.
+
+       chroma_amount, ca
+	   Set the chroma effect strength.  Range is "[-10, 10]" and default
+	   value is 0.0.
+
+	   Negative values will blur the input video, while positive values
+	   will sharpen it, a value of zero will disable the effect.
+
+       All parameters are optional and default to the equivalent of the string
+       '5:5:1.0:5:5:0.0'.
+
+       Examples
+
+       o   Apply strong luma sharpen effect:
+
+		   -i INPUT -vf "hwupload, unsharp_opencl=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5, hwdownload" OUTPUT
+
+       o   Apply a strong blur of both luma and chroma parameters:
+
+		   -i INPUT -vf "hwupload, unsharp_opencl=7:7:-2:7:7:-2, hwdownload" OUTPUT
+
+   xfade_opencl
+       Cross fade two videos with custom transition effect by using OpenCL.
+
+       It accepts the following options:
+
+       transition
+	   Set one of possible transition effects.
+
+	   custom
+	       Select custom transition effect, the actual transition
+	       description will be picked from source and kernel options.
+
+	   fade
+	   wipeleft
+	   wiperight
+	   wipeup
+	   wipedown
+	   slideleft
+	   slideright
+	   slideup
+	   slidedown
+	       Default transition is fade.
+
+       source
+	   OpenCL program source file for custom transition.
+
+       kernel
+	   Set name of kernel to use for custom transition from program source
+	   file.
+
+       duration
+	   Set duration of video transition.
+
+       offset
+	   Set time of start of transition relative to first video.
+
+       The program source file must contain a kernel function with the given
+       name, which will be run once for each plane of the output.  Each run on
+       a plane gets enqueued as a separate 2D global NDRange with one work-
+       item for each pixel to be generated.  The global ID offset for each
+       work-item is therefore the coordinates of a pixel in the destination
+       image.
+
+       The kernel function needs to take the following arguments:
+
+       o   Destination image, __write_only image2d_t.
+
+	   This image will become the output; the kernel should write all of
+	   it.
+
+       o   First Source image, __read_only image2d_t.  Second Source image,
+	   __read_only image2d_t.
+
+	   These are the most recent images on each input.  The kernel may
+	   read from them to generate the output, but they can't be written
+	   to.
+
+       o   Transition progress, float. This value is always between 0 and 1
+	   inclusive.
+
+       Example programs:
+
+       o   Apply dots curtain transition effect:
+
+		   __kernel void blend_images(__write_only image2d_t dst,
+					      __read_only  image2d_t src1,
+					      __read_only  image2d_t src2,
+					      float progress)
+		   {
+		       const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+						  CLK_FILTER_LINEAR);
+		       int2  p = (int2)(get_global_id(0), get_global_id(1));
+		       float2 rp = (float2)(get_global_id(0), get_global_id(1));
+		       float2 dim = (float2)(get_image_dim(src1).x, get_image_dim(src1).y);
+		       rp = rp / dim;
+
+		       float2 dots = (float2)(20.0, 20.0);
+		       float2 center = (float2)(0,0);
+		       float2 unused;
+
+		       float4 val1 = read_imagef(src1, sampler, p);
+		       float4 val2 = read_imagef(src2, sampler, p);
+		       bool next = distance(fract(rp * dots, &unused), (float2)(0.5, 0.5)) < (progress / distance(rp, center));
+
+		       write_imagef(dst, p, next ? val1 : val2);
+		   }
+
+VAAPI VIDEO FILTERS
+       VAAPI Video filters are usually used with VAAPI decoder and VAAPI
+       encoder. Below is a description of VAAPI video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-vaapi".
+
+       To use vaapi filters, you need to setup the vaapi device correctly. For
+       more information, please read
+       <https://trac.ffmpeg.org/wiki/Hardware/VAAPI>
+
+   overlay_vaapi
+       Overlay one video on the top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.
+
+       The filter accepts the following options:
+
+       x
+       y   Set expressions for the x and y coordinates of the overlaid video
+	   on the main video.
+
+	   Default value is "0" for both expressions.
+
+       w
+       h   Set expressions for the width and height the overlaid video on the
+	   main video.
+
+	   Default values are 'overlay_iw' for 'w' and
+	   'overlay_ih*w/overlay_iw' for 'h'.
+
+	   The expressions can contain the following parameters:
+
+	   main_w, W
+	   main_h, H
+	       The main input width and height.
+
+	   overlay_iw
+	   overlay_ih
+	       The overlay input width and height.
+
+	   overlay_w, w
+	   overlay_h, h
+	       The overlay output width and height.
+
+	   overlay_x, x
+	   overlay_y, y
+	       Position of the overlay layer inside of main
+
+       alpha
+	   Set transparency of overlaid video. Allowed range is 0.0 to 1.0.
+	   Higher value means lower transparency.  Default value is 1.0.
+
+       eof_action
+	   See framesync.
+
+       shortest
+	   See framesync.
+
+       repeatlast
+	   See framesync.
+
+       This filter also supports the framesync options.
+
+       Examples
+
+       o   Overlay an image LOGO at the top-left corner of the INPUT video.
+	   Both inputs for this filter are yuv420p format.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuv420p, hwupload[b], [a][b]overlay_vaapi" OUTPUT
+
+       o   Overlay an image LOGO at the offset (200, 100) from the top-left
+	   corner of the INPUT video.  The inputs have same memory layout for
+	   color channels, the overlay has additional alpha plane, like INPUT
+	   is yuv420p, and the LOGO is yuva420p.
+
+		   -i INPUT -i LOGO -filter_complex "[0:v]hwupload[a], [1:v]format=yuva420p, hwupload[b], [a][b]overlay_vaapi=x=200:y=100:w=400:h=300:alpha=1.0, hwdownload, format=nv12" OUTPUT
+
+   tonemap_vaapi
+       Perform HDR(High Dynamic Range) to SDR(Standard Dynamic Range)
+       conversion with tone-mapping.  It maps the dynamic range of HDR10
+       content to the SDR content.  It currently only accepts HDR10 as input.
+
+       It accepts the following parameters:
+
+       format
+	   Specify the output pixel format.
+
+	   Currently supported formats are:
+
+	   p010
+	   nv12
+
+	   Default is nv12.
+
+       primaries, p
+	   Set the output color primaries.
+
+	   Default is same as input.
+
+       transfer, t
+	   Set the output transfer characteristics.
+
+	   Default is bt709.
+
+       matrix, m
+	   Set the output colorspace matrix.
+
+	   Default is same as input.
+
+       Example
+
+       o   Convert HDR(HDR10) video to bt2020-transfer-characteristic p010
+	   format
+
+		   tonemap_vaapi=format=p010:t=bt2020-10
+
+   hstack_vaapi
+       Stack input videos horizontally.
+
+       This is the VA-API variant of the hstack filter, each input stream may
+       have different height, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See hstack.
+
+       shortest
+	   See hstack.
+
+       height
+	   Set height of output. If set to 0, this filter will set height of
+	   output to height of the first input stream. Default value is 0.
+
+   vstack_vaapi
+       Stack input videos vertically.
+
+       This is the VA-API variant of the vstack filter, each input stream may
+       have different width, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See vstack.
+
+       shortest
+	   See vstack.
+
+       width
+	   Set width of output. If set to 0, this filter will set width of
+	   output to width of the first input stream. Default value is 0.
+
+   xstack_vaapi
+       Stack video inputs into custom layout.
+
+       This is the VA-API variant of the xstack filter,  each input stream may
+       have different size, this filter will scale down/up each input stream
+       to the given output size, or the size of the first input stream.
+
+       It accepts the following options:
+
+       inputs
+	   See xstack.
+
+       shortest
+	   See xstack.
+
+       layout
+	   See xstack.	Moreover, this permits the user to supply output size
+	   for each input stream.
+
+		   xstack_vaapi=inputs=4:layout=0_0_1920x1080|0_h0_1920x1080|w0_0_1920x1080|w0_h0_1920x1080
+
+       grid
+	   See xstack.
+
+       grid_tile_size
+	   Set output size for each input stream when grid is set. If this
+	   option is not set, this filter will set output size by default to
+	   the size of the first input stream. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+       fill
+	   See xstack.
+
+VULKAN VIDEO FILTERS
+       Below is a description of the currently available Vulkan video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-vulkan" and either "--enable-libglslang" or
+       "--enable-libshaderc".
+
+       Running Vulkan filters requires you to initialize a hardware device and
+       to pass that device to all filters in any filter graph.
+
+       -init_hw_device vulkan[=name][:device[,key=value...]]
+	   Initialise a new hardware device of type vulkan called name, using
+	   the given device parameters and options in key=value. The following
+	   options are supported:
+
+	   debug
+	       Switches validation layers on if set to 1.
+
+	   linear_images
+	       Allocates linear images. Does not apply to decoding.
+
+	   disable_multiplane
+	       Disables multiplane images. Does not apply to decoding.
+
+       -filter_hw_device name
+	   Pass the hardware device called name to all filters in any filter
+	   graph.
+
+       For more detailed information see
+       <https://www.ffmpeg.org/ffmpeg.html#Advanced-Video-options>
+
+       o   Example of choosing the first device and running nlmeans_vulkan
+	   filter with default parameters on it.
+
+		   -init_hw_device vulkan=vk:0 -filter_hw_device vk -i INPUT -vf "hwupload,nlmeans_vulkan,hwdownload" OUTPUT
+
+       As Vulkan filters are not able to access frame data in normal memory,
+       all frame data needs to be uploaded (hwupload) to hardware surfaces
+       connected to the appropriate device before being used and then
+       downloaded (hwdownload) back to normal memory. Note that hwupload will
+       upload to a frame with the same layout as the software frame, so it may
+       be necessary to add a format filter immediately before to get the input
+       into the right format and hwdownload does not support all formats on
+       the output - it is usually necessary to insert an additional format
+       filter immediately following in the graph to get the output in a
+       supported format.
+
+   avgblur_vulkan
+       Apply an average blur filter, implemented on the GPU using Vulkan.
+
+       The filter accepts the following options:
+
+       sizeX
+	   Set horizontal radius size.	Range is "[1, 32]" and default value
+	   is 3.
+
+       sizeY
+	   Set vertical radius size. Range is "[1, 32]" and default value is
+	   3.
+
+       planes
+	   Set which planes to filter. Default value is 0xf, by which all
+	   planes are processed.
+
+   blend_vulkan
+       Blend two Vulkan frames into each other.
+
+       The "blend" filter takes two input streams and outputs one stream, the
+       first input is the "top" layer and second input is "bottom" layer.  By
+       default, the output terminates when the longest input terminates.
+
+       A description of the accepted options follows.
+
+       c0_mode
+       c1_mode
+       c2_mode
+       c3_mode
+       all_mode
+	   Set blend mode for specific pixel component or all pixel components
+	   in case of all_mode. Default value is "normal".
+
+	   Available values for component modes are:
+
+	   normal
+	   multiply
+
+   bwdif_vulkan
+       Deinterlacer using bwdif, the "Bob Weaver Deinterlacing Filter"
+       algorithm, implemented on the GPU using Vulkan.
+
+       It accepts the following parameters:
+
+       mode
+	   The interlacing mode to adopt. It accepts one of the following
+	   values:
+
+	   0, send_frame
+	       Output one frame for each frame.
+
+	   1, send_field
+	       Output one frame for each field.
+
+	   The default value is "send_field".
+
+       parity
+	   The picture field parity assumed for the input interlaced video. It
+	   accepts one of the following values:
+
+	   0, tff
+	       Assume the top field is first.
+
+	   1, bff
+	       Assume the bottom field is first.
+
+	   -1, auto
+	       Enable automatic detection of field parity.
+
+	   The default value is "auto".  If the interlacing is unknown or the
+	   decoder does not export this information, top field first will be
+	   assumed.
+
+       deint
+	   Specify which frames to deinterlace. Accepts one of the following
+	   values:
+
+	   0, all
+	       Deinterlace all frames.
+
+	   1, interlaced
+	       Only deinterlace frames marked as interlaced.
+
+	   The default value is "all".
+
+   chromaber_vulkan
+       Apply an effect that emulates chromatic aberration. Works best with RGB
+       inputs, but provides a similar effect with YCbCr inputs too.
+
+       dist_x
+	   Horizontal displacement multiplier. Each chroma pixel's position
+	   will be multiplied by this amount, starting from the center of the
+	   image. Default is 0.
+
+       dist_y
+	   Similarly, this sets the vertical displacement multiplier. Default
+	   is 0.
+
+   color_vulkan
+       Video source that creates a Vulkan frame of a solid color.  Useful for
+       benchmarking, or overlaying.
+
+       It accepts the following parameters:
+
+       color
+	   The color to use. Either a name, or a hexadecimal value.  The
+	   default value is "black".
+
+       size
+	   The size of the output frame. Default value is "1920x1080".
+
+       rate
+	   The framerate to output at. Default value is 60 frames per second.
+
+       duration
+	   The video duration. Default value is "-0.000001".
+
+       sar The video signal aspect ratio. Default value is "1/1".
+
+       format
+	   The pixel format of the output Vulkan frames. Default value is
+	   "yuv444p".
+
+       out_range
+	   Set the output YCbCr sample range.
+
+	   This allows the autodetected value to be overridden as well as
+	   allows forcing a specific value used for the output and encoder. If
+	   not specified, the range depends on the pixel format. Possible
+	   values:
+
+	   auto/unknown
+	       Choose automatically.
+
+	   jpeg/full/pc
+	       Set full range (0-255 in case of 8-bit luma).
+
+	   mpeg/limited/tv
+	       Set "MPEG" range (16-235 in case of 8-bit luma).
+
+   vflip_vulkan
+       Flips an image vertically.
+
+   hflip_vulkan
+       Flips an image horizontally.
+
+   flip_vulkan
+       Flips an image along both the vertical and horizontal axis.
+
+   gblur_vulkan
+       Apply Gaussian blur filter on Vulkan frames.
+
+       The filter accepts the following options:
+
+       sigma
+	   Set horizontal sigma, standard deviation of Gaussian blur. Default
+	   is 0.5.
+
+       sigmaV
+	   Set vertical sigma, if negative it will be same as "sigma".
+	   Default is "-1".
+
+       planes
+	   Set which planes to filter. By default all planes are filtered.
+
+       size
+	   Set the kernel size along the horizontal axis. Default is 19.
+
+       sizeV
+	   Set the kernel size along the vertical axis. Default is 0, which
+	   sets to use the same value as size.
+
+   nlmeans_vulkan
+       Denoise frames using Non-Local Means algorithm, implemented on the GPU
+       using Vulkan.  Supports more pixel formats than nlmeans or
+       nlmeans_opencl, including alpha channel support.
+
+       The filter accepts the following options.
+
+       s   Set denoising strength for all components. Default is 1.0. Must be
+	   in range [1.0, 100.0].
+
+       p   Set patch size for all planes. Default is 7. Must be odd number in
+	   range [0, 99].
+
+       r   Set research size. Default is 15. Must be odd number in range [0,
+	   99].
+
+       t   Set parallelism. Default is 36. Must be a number in the range [1,
+	   168].  Larger values may speed up processing, at the cost of more
+	   VRAM.  Lower values will slow it down, reducing VRAM usage.	Only
+	   supported on GPUs with atomic float operations (RDNA3+, Ampere+).
+
+       s0
+       s1
+       s2
+       s3  Set denoising strength for a specific component. Default is 1,
+	   equal to s.	Must be odd number in range [1, 100].
+
+       p0
+       p1
+       p2
+       p3  Set patch size for a specific component. Default is 7, equal to p.
+	   Must be odd number in range [0, 99].
+
+   overlay_vulkan
+       Overlay one video on top of another.
+
+       It takes two inputs and has one output. The first input is the "main"
+       video on which the second input is overlaid.  This filter requires all
+       inputs to use the same pixel format. So, format conversion may be
+       needed.
+
+       The filter accepts the following options:
+
+       x   Set the x coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+       y   Set the y coordinate of the overlaid video on the main video.
+	   Default value is 0.
+
+   transpose_vt
+       Transpose rows with columns in the input video and optionally flip it.
+       For more in depth examples see the transpose video filter, which shares
+       mostly the same options.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip.
+	       (default)
+
+	   clock
+	       Rotate by 90 degrees clockwise.
+
+	   cclock
+	       Rotate by 90 degrees counterclockwise.
+
+	   clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip.
+
+	   hflip
+	       Flip the input video horizontally.
+
+	   vflip
+	       Flip the input video vertically.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition. (default)
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+   transpose_vulkan
+       Transpose rows with columns in the input video and optionally flip it.
+       For more in depth examples see the transpose video filter, which shares
+       mostly the same options.
+
+       It accepts the following parameters:
+
+       dir Specify the transposition direction.
+
+	   Can assume the following values:
+
+	   cclock_flip
+	       Rotate by 90 degrees counterclockwise and vertically flip.
+	       (default)
+
+	   clock
+	       Rotate by 90 degrees clockwise.
+
+	   cclock
+	       Rotate by 90 degrees counterclockwise.
+
+	   clock_flip
+	       Rotate by 90 degrees clockwise and vertically flip.
+
+       passthrough
+	   Do not apply the transposition if the input geometry matches the
+	   one specified by the specified value. It accepts the following
+	   values:
+
+	   none
+	       Always apply transposition. (default)
+
+	   portrait
+	       Preserve portrait geometry (when height >= width).
+
+	   landscape
+	       Preserve landscape geometry (when width >= height).
+
+QSV VIDEO FILTERS
+       Below is a description of the currently available QSV video filters.
+
+       To enable compilation of these filters you need to configure FFmpeg
+       with "--enable-libmfx" or "--enable-libvpl".
+
+       To use QSV filters, you need to setup the QSV device correctly. For
+       more information, please read
+       <https://trac.ffmpeg.org/wiki/Hardware/QuickSync>
+
+   hstack_qsv
+       Stack input videos horizontally.
+
+       This is the QSV variant of the hstack filter, each input stream may
+       have different height, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See hstack.
+
+       shortest
+	   See hstack.
+
+       height
+	   Set height of output. If set to 0, this filter will set height of
+	   output to height of the first input stream. Default value is 0.
+
+   vstack_qsv
+       Stack input videos vertically.
+
+       This is the QSV variant of the vstack filter, each input stream may
+       have different width, this filter will scale down/up each input stream
+       while keeping the original aspect.
+
+       It accepts the following options:
+
+       inputs
+	   See vstack.
+
+       shortest
+	   See vstack.
+
+       width
+	   Set width of output. If set to 0, this filter will set width of
+	   output to width of the first input stream. Default value is 0.
+
+   xstack_qsv
+       Stack video inputs into custom layout.
+
+       This is the QSV variant of the xstack filter.
+
+       It accepts the following options:
+
+       inputs
+	   See xstack.
+
+       shortest
+	   See xstack.
+
+       layout
+	   See xstack.	Moreover, this permits the user to supply output size
+	   for each input stream.
+
+		   xstack_qsv=inputs=4:layout=0_0_1920x1080|0_h0_1920x1080|w0_0_1920x1080|w0_h0_1920x1080
+
+       grid
+	   See xstack.
+
+       grid_tile_size
+	   Set output size for each input stream when grid is set. If this
+	   option is not set, this filter will set output size by default to
+	   the size of the first input stream. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+       fill
+	   See xstack.
+
+VIDEO SOURCES
+       Below is a description of the currently available video sources.
+
+   buffer
+       Buffer video frames, and make them available to the filter chain.
+
+       This source is mainly intended for a programmatic use, in particular
+       through the interface defined in libavfilter/buffersrc.h.
+
+       It accepts the following parameters:
+
+       video_size
+	   Specify the size (width and height) of the buffered video frames.
+	   For the syntax of this option, check the "Video size" section in
+	   the ffmpeg-utils manual.
+
+       width
+	   The input video width.
+
+       height
+	   The input video height.
+
+       pix_fmt
+	   A string representing the pixel format of the buffered video
+	   frames.  It may be a number corresponding to a pixel format, or a
+	   pixel format name.
+
+       time_base
+	   Specify the timebase assumed by the timestamps of the buffered
+	   frames.
+
+       frame_rate
+	   Specify the frame rate expected for the video stream.
+
+       colorspace
+	   A string representing the color space of the buffered video frames.
+	   It may be a number corresponding to a color space, or a color space
+	   name.
+
+       range
+	   A string representing the color range of the buffered video frames.
+	   It may be a number corresponding to a color range, or a color range
+	   name.
+
+       pixel_aspect, sar
+	   The sample (pixel) aspect ratio of the input video.
+
+       hw_frames_ctx
+	   When using a hardware pixel format, this should be a reference to
+	   an AVHWFramesContext describing input frames.
+
+       For example:
+
+	       buffer=width=320:height=240:pix_fmt=yuv410p:time_base=1/24:sar=1
+
+       will instruct the source to accept video frames with size 320x240 and
+       with format "yuv410p", assuming 1/24 as the timestamps timebase and
+       square pixels (1:1 sample aspect ratio).  Since the pixel format with
+       name "yuv410p" corresponds to the number 6 (check the enum
+       AVPixelFormat definition in libavutil/pixfmt.h), this example
+       corresponds to:
+
+	       buffer=size=320x240:pixfmt=6:time_base=1/24:pixel_aspect=1/1
+
+       Alternatively, the options can be specified as a flat string, but this
+       syntax is deprecated:
+
+       width:height:pix_fmt:time_base.num:time_base.den:pixel_aspect.num:pixel_aspect.den
+
+   cellauto
+       Create a pattern generated by an elementary cellular automaton.
+
+       The initial state of the cellular automaton can be defined through the
+       filename and pattern options. If such options are not specified an
+       initial state is created randomly.
+
+       At each new frame a new row in the video is filled with the result of
+       the cellular automaton next generation. The behavior when the whole
+       frame is filled is defined by the scroll option.
+
+       This source accepts the following options:
+
+       filename, f
+	   Read the initial cellular automaton state, i.e. the starting row,
+	   from the specified file.  In the file, each non-whitespace
+	   character is considered an alive cell, a newline will terminate the
+	   row, and further characters in the file will be ignored.
+
+       pattern, p
+	   Read the initial cellular automaton state, i.e. the starting row,
+	   from the specified string.
+
+	   Each non-whitespace character in the string is considered an alive
+	   cell, a newline will terminate the row, and further characters in
+	   the string will be ignored.
+
+       rate, r
+	   Set the video rate, that is the number of frames generated per
+	   second.  Default is 25.
+
+       random_fill_ratio, ratio
+	   Set the random fill ratio for the initial cellular automaton row.
+	   It is a floating point number value ranging from 0 to 1, defaults
+	   to 1/PHI.
+
+	   This option is ignored when a file or a pattern is specified.
+
+       random_seed, seed
+	   Set the seed for filling randomly the initial row, must be an
+	   integer included between 0 and UINT32_MAX. If not specified, or if
+	   explicitly set to -1, the filter will try to use a good random seed
+	   on a best effort basis.
+
+       rule
+	   Set the cellular automaton rule, it is a number ranging from 0 to
+	   255.  Default value is 110.
+
+       size, s
+	   Set the size of the output video. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+	   If filename or pattern is specified, the size is set by default to
+	   the width of the specified initial state row, and the height is set
+	   to width * PHI.
+
+	   If size is set, it must contain the width of the specified pattern
+	   string, and the specified pattern will be centered in the larger
+	   row.
+
+	   If a filename or a pattern string is not specified, the size value
+	   defaults to "320x518" (used for a randomly generated initial
+	   state).
+
+       scroll
+	   If set to 1, scroll the output upward when all the rows in the
+	   output have been already filled. If set to 0, the new generated row
+	   will be written over the top row just after the bottom row is
+	   filled.  Defaults to 1.
+
+       start_full, full
+	   If set to 1, completely fill the output with generated rows before
+	   outputting the first frame.	This is the default behavior, for
+	   disabling set the value to 0.
+
+       stitch
+	   If set to 1, stitch the left and right row edges together.  This is
+	   the default behavior, for disabling set the value to 0.
+
+       Examples
+
+       o   Read the initial state from pattern, and specify an output of size
+	   200x400.
+
+		   cellauto=f=pattern:s=200x400
+
+       o   Generate a random initial row with a width of 200 cells, with a
+	   fill ratio of 2/3:
+
+		   cellauto=ratio=2/3:s=200x200
+
+       o   Create a pattern generated by rule 18 starting by a single alive
+	   cell centered on an initial row with width 100:
+
+		   cellauto=p=@s=100x400:full=0:rule=18
+
+       o   Specify a more elaborated initial pattern:
+
+		   cellauto=p='@@ @ @@':s=100x400:full=0:rule=18
+
+   coreimagesrc
+       Video source generated on GPU using Apple's CoreImage API on OSX.
+
+       This video source is a specialized version of the coreimage video
+       filter.	Use a core image generator at the beginning of the applied
+       filterchain to generate the content.
+
+       The coreimagesrc video source accepts the following options:
+
+       list_generators
+	   List all available generators along with all their respective
+	   options as well as possible minimum and maximum values along with
+	   the default values.
+
+		   list_generators=true
+
+       size, s
+	   Specify the size of the sourced video. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   The default value is "320x240".
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       sar Set the sample aspect ratio of the sourced video.
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       Additionally, all options of the coreimage video filter are accepted.
+       A complete filterchain can be used for further processing of the
+       generated input without CPU-HOST transfer. See coreimage documentation
+       and examples for details.
+
+       Examples
+
+       o   Use CIQRCodeGenerator to create a QR code for the FFmpeg homepage,
+	   given as complete and escaped command-line for Apple's standard
+	   bash shell:
+
+		   ffmpeg -f lavfi -i coreimagesrc=s=100x100:filter=CIQRCodeGenerator@inputMessage=https\\\\\://FFmpeg.org/@inputCorrectionLevel=H -frames:v 1 QRCode.png
+
+	   This example is equivalent to the QRCode example of coreimage
+	   without the need for a nullsrc video source.
+
+   ddagrab
+       Captures the Windows Desktop via Desktop Duplication API.
+
+       The filter exclusively returns D3D11 Hardware Frames, for on-gpu
+       encoding or processing. So an explicit hwdownload is needed for any
+       kind of software processing.
+
+       It accepts the following options:
+
+       output_idx
+	   DXGI Output Index to capture.
+
+	   Usually corresponds to the index Windows has given the screen minus
+	   one, so it's starting at 0.
+
+	   Defaults to output 0.
+
+       draw_mouse
+	   Whether to draw the mouse cursor.
+
+	   Defaults to true.
+
+	   Only affects hardware cursors. If a game or application renders its
+	   own cursor, it'll always be captured.
+
+       framerate
+	   Maximum framerate at which the desktop will be captured - the
+	   interval between successive frames will not be smaller than the
+	   inverse of the framerate. When dup_frames is true (the default) and
+	   the desktop is not being updated often enough, the filter will
+	   duplicate a previous frame. Note that there is no background
+	   buffering going on, so when the filter is not polled often enough
+	   then the actual inter-frame interval may be significantly larger.
+
+	   Defaults to 30 FPS.
+
+       video_size
+	   Specify the size of the captured video.
+
+	   Defaults to the full size of the screen.
+
+	   Cropped from the bottom/right if smaller than screen size.
+
+       offset_x
+	   Horizontal offset of the captured video.
+
+       offset_y
+	   Vertical offset of the captured video.
+
+       output_fmt
+	   Desired filter output format.  Defaults to 8 Bit BGRA.
+
+	   It accepts the following values:
+
+	   auto
+	       Passes all supported output formats to DDA and returns what DDA
+	       decides to use.
+
+	   8bit
+	   bgra
+	       8 Bit formats always work, and DDA will convert to them if
+	       necessary.
+
+	   10bit
+	   x2bgr10
+	       Filter initialization will fail if 10 bit format is requested
+	       but unavailable.
+
+       dup_frames
+	   When this option is set to true (the default), the filter will
+	   duplicate frames when the desktop has not been updated in order to
+	   maintain approximately constant target framerate. When this option
+	   is set to false, the filter will wait for the desktop to be updated
+	   (inter-frame intervals may vary significantly in this case).
+
+       Examples
+
+       Capture primary screen and encode using nvenc:
+
+	       ffmpeg -f lavfi -i ddagrab -c:v h264_nvenc -cq 18 output.mp4
+
+       You can also skip the lavfi device and directly use the filter.	Also
+       demonstrates downloading the frame and encoding with libx264.  Explicit
+       output format specification is required in this case:
+
+	       ffmpeg -filter_complex ddagrab=output_idx=1:framerate=60,hwdownload,format=bgra -c:v libx264 -crf 18 output.mp4
+
+       If you want to capture only a subsection of the desktop, this can be
+       achieved by specifying a smaller size and its offsets into the screen:
+
+	       ddagrab=video_size=800x600:offset_x=100:offset_y=100
+
+   gradients
+       Generate several gradients.
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "640x480".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       c0, c1, c2, c3, c4, c5, c6, c7
+	   Set 8 colors. Default values for colors is to pick random one.
+
+       x0, y0, y0, y1
+	   Set gradient line source and destination points. If negative or out
+	   of range, random ones are picked.
+
+       nb_colors, n
+	   Set number of colors to use at once. Allowed range is from 2 to 8.
+	   Default value is 2.
+
+       seed
+	   Set seed for picking gradient line points.
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       speed
+	   Set speed of gradients rotation.
+
+       type, t
+	   Set type of gradients.  Available values are:
+
+	   linear
+	   radial
+	   circular
+	   spiral
+	   square
+
+	   Default type is linear.
+
+       Commands
+
+       This source supports the some above options as commands.
+
+   mandelbrot
+       Generate a Mandelbrot set fractal, and progressively zoom towards the
+       point specified with start_x and start_y.
+
+       This source accepts the following options:
+
+       end_pts
+	   Set the terminal pts value. Default value is 400.
+
+       end_scale
+	   Set the terminal scale value.  Must be a floating point value.
+	   Default value is 0.3.
+
+       inner
+	   Set the inner coloring mode, that is the algorithm used to draw the
+	   Mandelbrot fractal internal region.
+
+	   It shall assume one of the following values:
+
+	   black
+	       Set black mode.
+
+	   convergence
+	       Show time until convergence.
+
+	   mincol
+	       Set color based on point closest to the origin of the
+	       iterations.
+
+	   period
+	       Set period mode.
+
+	   Default value is mincol.
+
+       bailout
+	   Set the bailout value. Default value is 10.0.
+
+       maxiter
+	   Set the maximum of iterations performed by the rendering algorithm.
+	   Default value is 7189.
+
+       outer
+	   Set outer coloring mode.  It shall assume one of following values:
+
+	   iteration_count
+	       Set iteration count mode.
+
+	   normalized_iteration_count
+	       set normalized iteration count mode.
+
+	   Default value is normalized_iteration_count.
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "640x480".
+
+       start_scale
+	   Set the initial scale value. Default value is 3.0.
+
+       start_x
+	   Set the initial x position. Must be a floating point value between
+	   -100 and 100. Default value is
+	   -0.743643887037158704752191506114774.
+
+       start_y
+	   Set the initial y position. Must be a floating point value between
+	   -100 and 100. Default value is
+	   -0.131825904205311970493132056385139.
+
+   mptestsrc
+       Generate various test patterns, as generated by the MPlayer test
+       filter.
+
+       The size of the generated video is fixed, and is 256x256.  This source
+       is useful in particular for testing encoding features.
+
+       This source accepts the following options:
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       test, t
+	   Set the number or the name of the test to perform. Supported tests
+	   are:
+
+	   dc_luma
+	   dc_chroma
+	   freq_luma
+	   freq_chroma
+	   amp_luma
+	   amp_chroma
+	   cbp
+	   mv
+	   ring1
+	   ring2
+	   all
+	   max_frames, m
+	       Set the maximum number of frames generated for each test,
+	       default value is 30.
+
+	   Default value is "all", which will cycle through the list of all
+	   tests.
+
+       Some examples:
+
+	       mptestsrc=t=dc_luma
+
+       will generate a "dc_luma" test pattern.
+
+   frei0r_src
+       Provide a frei0r source.
+
+       To enable compilation of this filter you need to install the frei0r
+       header and configure FFmpeg with "--enable-frei0r".
+
+       This source accepts the following parameters:
+
+       size
+	   The size of the video to generate. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+       framerate
+	   The framerate of the generated video. It may be a string of the
+	   form num/den or a frame rate abbreviation.
+
+       filter_name
+	   The name to the frei0r source to load. For more information
+	   regarding frei0r and how to set the parameters, read the frei0r
+	   section in the video filters documentation.
+
+       filter_params
+	   A '|'-separated list of parameters to pass to the frei0r source.
+
+       For example, to generate a frei0r partik0l source with size 200x200 and
+       frame rate 10 which is overlaid on the overlay filter main input:
+
+	       frei0r_src=size=200x200:framerate=10:filter_name=partik0l:filter_params=1234 [overlay]; [in][overlay] overlay
+
+   life
+       Generate a life pattern.
+
+       This source is based on a generalization of John Conway's life game.
+
+       The sourced input represents a life grid, each pixel represents a cell
+       which can be in one of two possible states, alive or dead. Every cell
+       interacts with its eight neighbours, which are the cells that are
+       horizontally, vertically, or diagonally adjacent.
+
+       At each interaction the grid evolves according to the adopted rule,
+       which specifies the number of neighbor alive cells which will make a
+       cell stay alive or born. The rule option allows one to specify the rule
+       to adopt.
+
+       This source accepts the following options:
+
+       filename, f
+	   Set the file from which to read the initial grid state. In the
+	   file, each non-whitespace character is considered an alive cell,
+	   and newline is used to delimit the end of each row.
+
+	   If this option is not specified, the initial grid is generated
+	   randomly.
+
+       rate, r
+	   Set the video rate, that is the number of frames generated per
+	   second.  Default is 25.
+
+       random_fill_ratio, ratio
+	   Set the random fill ratio for the initial random grid. It is a
+	   floating point number value ranging from 0 to 1, defaults to 1/PHI.
+	   It is ignored when a file is specified.
+
+       random_seed, seed
+	   Set the seed for filling the initial random grid, must be an
+	   integer included between 0 and UINT32_MAX. If not specified, or if
+	   explicitly set to -1, the filter will try to use a good random seed
+	   on a best effort basis.
+
+       rule
+	   Set the life rule.
+
+	   A rule can be specified with a code of the kind "SNS/BNB", where NS
+	   and NB are sequences of numbers in the range 0-8, NS specifies the
+	   number of alive neighbor cells which make a live cell stay alive,
+	   and NB the number of alive neighbor cells which make a dead cell to
+	   become alive (i.e. to "born").  "s" and "b" can be used in place of
+	   "S" and "B", respectively.
+
+	   Alternatively a rule can be specified by an 18-bits integer. The 9
+	   high order bits are used to encode the next cell state if it is
+	   alive for each number of neighbor alive cells, the low order bits
+	   specify the rule for "borning" new cells. Higher order bits encode
+	   for an higher number of neighbor cells.  For example the number
+	   6153 = "(12<<9)+9" specifies a stay alive rule of 12 and a born
+	   rule of 9, which corresponds to "S23/B03".
+
+	   Default value is "S23/B3", which is the original Conway's game of
+	   life rule, and will keep a cell alive if it has 2 or 3 neighbor
+	   alive cells, and will born a new cell if there are three alive
+	   cells around a dead cell.
+
+       size, s
+	   Set the size of the output video. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.
+
+	   If filename is specified, the size is set by default to the same
+	   size of the input file. If size is set, it must contain the size
+	   specified in the input file, and the initial grid defined in that
+	   file is centered in the larger resulting area.
+
+	   If a filename is not specified, the size value defaults to
+	   "320x240" (used for a randomly generated initial grid).
+
+       stitch
+	   If set to 1, stitch the left and right grid edges together, and the
+	   top and bottom edges also. Defaults to 1.
+
+       mold
+	   Set cell mold speed. If set, a dead cell will go from death_color
+	   to mold_color with a step of mold. mold can have a value from 0 to
+	   255.
+
+       life_color
+	   Set the color of living (or new born) cells.
+
+       death_color
+	   Set the color of dead cells. If mold is set, this is the first
+	   color used to represent a dead cell.
+
+       mold_color
+	   Set mold color, for definitely dead and moldy cells.
+
+	   For the syntax of these 3 color options, check the "Color" section
+	   in the ffmpeg-utils manual.
+
+       Examples
+
+       o   Read a grid from pattern, and center it on a grid of size 300x300
+	   pixels:
+
+		   life=f=pattern:s=300x300
+
+       o   Generate a random grid of size 200x200, with a fill ratio of 2/3:
+
+		   life=ratio=2/3:s=200x200
+
+       o   Specify a custom rule for evolving a randomly generated grid:
+
+		   life=rule=S14/B34
+
+       o   Full example with slow death effect (mold) using ffplay:
+
+		   ffplay -f lavfi life=s=300x200:mold=10:r=60:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=1200:800:flags=16
+
+   qrencodesrc
+       Generate a QR code using the libqrencode library (see
+       <https://fukuchi.org/works/qrencode/>).
+
+       To enable the compilation of this source, you need to configure FFmpeg
+       with "--enable-libqrencode".
+
+       The QR code is generated from the provided text or text pattern. The
+       corresponding QR code is scaled and put in the video output according
+       to the specified output size options.
+
+       In case no text is specified, the QR code is not generated, but an
+       empty colored output is returned instead.
+
+       This source accepts the following options:
+
+       qrcode_width, q
+       padded_qrcode_width, Q
+	   Specify an expression for the width of the rendered QR code, with
+	   and without padding. The qrcode_width expression can reference the
+	   value set by the padded_qrcode_width expression, and vice versa.
+	   By default padded_qrcode_width is set to qrcode_width, meaning that
+	   there is no padding.
+
+	   These expressions are evaluated only once, when initializing the
+	   source.  See the qrencode Expressions section for details.
+
+	   Note that some of the constants are missing for the source (for
+	   example the x or t or Xn), since they only makes sense when
+	   evaluating the expression for each frame rather than at
+	   initialization time.
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       case_sensitive, cs
+	   Instruct libqrencode to use case sensitive encoding. This is
+	   enabled by default. This can be disabled to reduce the QR encoding
+	   size.
+
+       level, l
+	   Specify the QR encoding error correction level. With an higher
+	   correction level, the encoding size will increase but the code will
+	   be more robust to corruption.  Lower level is L.
+
+	   It accepts the following values:
+
+	   L
+	   M
+	   Q
+	   H
+       expansion
+	   Select how the input text is expanded. Can be either "none", or
+	   "normal" (default). See the qrencode Text expansion section for
+	   details.
+
+       text
+       textfile
+	   Define the text to be rendered. In case neither is specified, no QR
+	   is encoded (just an empty colored frame).
+
+	   In case expansion is enabled, the text is treated as a text
+	   template, using the qrencode expansion mechanism. See the qrencode
+	   Text expansion section for details.
+
+       background_color, bc
+       foreground_color, fc
+	   Set the QR code and background color. The default value of
+	   foreground_color is "black", the default value of background_color
+	   is "white".
+
+	   For the syntax of the color options, check the "Color" section in
+	   the ffmpeg-utils manual.
+
+       Examples
+
+       o   Generate a QR code encoding the specified text with the default
+	   size:
+
+		   qrencodesrc=text=www.ffmpeg.org
+
+       o   Same as below, but select blue on pink colors:
+
+		   qrencodesrc=text=www.ffmpeg.org:bc=pink:fc=blue
+
+       o   Generate a QR code with width of 200 pixels and padding, making the
+	   padded width 4/3 of the QR code width:
+
+		   qrencodesrc=text=www.ffmpeg.org:q=200:Q=4/3*q
+
+       o   Generate a QR code with padded width of 200 pixels and padding,
+	   making the QR code width 3/4 of the padded width:
+
+		   qrencodesrc=text=www.ffmpeg.org:Q=200:q=3/4*Q
+
+       o   Generate a QR code encoding the frame number:
+
+		   qrencodesrc=text=%{n}
+
+       o   Generate a QR code encoding the GMT timestamp:
+
+		   qrencodesrc=text=%{gmtime}
+
+       o   Generate a QR code encoding the timestamp expressed as a float:
+
+		   qrencodesrc=text=%{pts}
+
+   allrgb, allyuv, color, colorchart, colorspectrum, haldclutsrc, nullsrc,
+       pal75bars, pal100bars, rgbtestsrc, smptebars, smptehdbars, testsrc,
+       testsrc2, yuvtestsrc
+       The "allrgb" source returns frames of size 4096x4096 of all rgb colors.
+
+       The "allyuv" source returns frames of size 4096x4096 of all yuv colors.
+
+       The "color" source provides an uniformly colored input.
+
+       The "colorchart" source provides a colors checker chart.
+
+       The "colorspectrum" source provides a color spectrum input.
+
+       The "haldclutsrc" source provides an identity Hald CLUT. See also
+       haldclut filter.
+
+       The "nullsrc" source returns unprocessed video frames. It is mainly
+       useful to be employed in analysis / debugging tools, or as the source
+       for filters which ignore the input data.
+
+       The "pal75bars" source generates a color bars pattern, based on EBU PAL
+       recommendations with 75% color levels.
+
+       The "pal100bars" source generates a color bars pattern, based on EBU
+       PAL recommendations with 100% color levels.
+
+       The "rgbtestsrc" source generates an RGB test pattern useful for
+       detecting RGB vs BGR issues. You should see a red, green and blue
+       stripe from top to bottom.
+
+       The "smptebars" source generates a color bars pattern, based on the
+       SMPTE Engineering Guideline EG 1-1990.
+
+       The "smptehdbars" source generates a color bars pattern, based on the
+       SMPTE RP 219-2002.
+
+       The "testsrc" source generates a test video pattern, showing a color
+       pattern, a scrolling gradient and a timestamp. This is mainly intended
+       for testing purposes.
+
+       The "testsrc2" source is similar to testsrc, but supports more pixel
+       formats instead of just "rgb24". This allows using it as an input for
+       other tests without requiring a format conversion.
+
+       The "yuvtestsrc" source generates an YUV test pattern. You should see a
+       y, cb and cr stripe from top to bottom.
+
+       The sources accept the following parameters:
+
+       level
+	   Specify the level of the Hald CLUT, only available in the
+	   "haldclutsrc" source. A level of "N" generates a picture of "N*N*N"
+	   by "N*N*N" pixels to be used as identity matrix for 3D lookup
+	   tables. Each component is coded on a "1/(N*N)" scale.
+
+       color, c
+	   Specify the color of the source, only available in the "color"
+	   source. For the syntax of this option, check the "Color" section in
+	   the ffmpeg-utils manual.
+
+       size, s
+	   Specify the size of the sourced video. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   The default value is "320x240".
+
+	   This option is not available with the "allrgb", "allyuv", and
+	   "haldclutsrc" filters.
+
+       rate, r
+	   Specify the frame rate of the sourced video, as the number of
+	   frames generated per second. It has to be a string in the format
+	   frame_rate_num/frame_rate_den, an integer number, a floating point
+	   number or a valid video frame rate abbreviation. The default value
+	   is "25".
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+	   Since the frame rate is used as time base, all frames including the
+	   last one will have their full duration. If the specified duration
+	   is not a multiple of the frame duration, it will be rounded up.
+
+       sar Set the sample aspect ratio of the sourced video.
+
+       alpha
+	   Specify the alpha (opacity) of the background, only available in
+	   the "testsrc2" source. The value must be between 0 (fully
+	   transparent) and 255 (fully opaque, the default).
+
+       decimals, n
+	   Set the number of decimals to show in the timestamp, only available
+	   in the "testsrc" source.
+
+	   The displayed timestamp value will correspond to the original
+	   timestamp value multiplied by the power of 10 of the specified
+	   value. Default value is 0.
+
+       type
+	   Set the type of the color spectrum, only available in the
+	   "colorspectrum" source. Can be one of the following:
+
+	   black
+	   white
+	   all
+       patch_size
+	   Set patch size of single color patch, only available in the
+	   "colorchart" source. Default is "64x64".
+
+       preset
+	   Set colorchecker colors preset, only available in the "colorchart"
+	   source.
+
+	   Available values are:
+
+	   reference
+	   skintones
+
+	   Default value is "reference".
+
+       Examples
+
+       o   Generate a video with a duration of 5.3 seconds, with size 176x144
+	   and a frame rate of 10 frames per second:
+
+		   testsrc=duration=5.3:size=qcif:rate=10
+
+       o   The following graph description will generate a red source with an
+	   opacity of 0.2, with size "qcif" and a frame rate of 10 frames per
+	   second:
+
+		   color=c=red@0.2:s=qcif:r=10
+
+       o   If the input content is to be ignored, "nullsrc" can be used. The
+	   following command generates noise in the luma plane by employing
+	   the "geq" filter:
+
+		   nullsrc=s=256x256, geq=random(1)*255:128:128
+
+       Commands
+
+       The "color" source supports the following commands:
+
+       c, color
+	   Set the color of the created image. Accepts the same syntax of the
+	   corresponding color option.
+
+   openclsrc
+       Generate video using an OpenCL program.
+
+       source
+	   OpenCL program source file.
+
+       kernel
+	   Kernel name in program.
+
+       size, s
+	   Size of frames to generate.	This must be set.
+
+       format
+	   Pixel format to use for the generated frames.  This must be set.
+
+       rate, r
+	   Number of frames generated every second.  Default value is '25'.
+
+       For details of how the program loading works, see the program_opencl
+       filter.
+
+       Example programs:
+
+       o   Generate a colour ramp by setting pixel values from the position of
+	   the pixel in the output image.  (Note that this will work with all
+	   pixel formats, but the generated output will not be the same.)
+
+		   __kernel void ramp(__write_only image2d_t dst,
+				      unsigned int index)
+		   {
+		       int2 loc = (int2)(get_global_id(0), get_global_id(1));
+
+		       float4 val;
+		       val.xy = val.zw = convert_float2(loc) / convert_float2(get_image_dim(dst));
+
+		       write_imagef(dst, loc, val);
+		   }
+
+       o   Generate a Sierpinski carpet pattern, panning by a single pixel
+	   each frame.
+
+		   __kernel void sierpinski_carpet(__write_only image2d_t dst,
+						   unsigned int index)
+		   {
+		       int2 loc = (int2)(get_global_id(0), get_global_id(1));
+
+		       float4 value = 0.0f;
+		       int x = loc.x + index;
+		       int y = loc.y + index;
+		       while (x > 0 || y > 0) {
+			   if (x % 3 == 1 && y % 3 == 1) {
+			       value = 1.0f;
+			       break;
+			   }
+			   x /= 3;
+			   y /= 3;
+		       }
+
+		       write_imagef(dst, loc, value);
+		   }
+
+   sierpinski
+       Generate a Sierpinski carpet/triangle fractal, and randomly pan around.
+
+       This source accepts the following options:
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "640x480".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       seed
+	   Set seed which is used for random panning.
+
+       jump
+	   Set max jump for single pan destination. Allowed range is from 1 to
+	   10000.
+
+       type
+	   Set fractal type, can be default "carpet" or "triangle".
+
+   zoneplate
+       Generate a zoneplate test video pattern.
+
+       This source accepts the following options:
+
+       size, s
+	   Set frame size. For the syntax of this option, check the "Video
+	   size" section in the ffmpeg-utils manual. Default value is
+	   "320x240".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       duration, d
+	   Set the duration of the sourced video. See the Time duration
+	   section in the ffmpeg-utils(1) manual for the accepted syntax.
+
+	   If not specified, or the expressed duration is negative, the video
+	   is supposed to be generated forever.
+
+       sar Set the sample aspect ratio of the sourced video.
+
+       precision
+	   Set precision in bits for look-up table for sine calculations.
+	   Default value is 10.  Allowed range is from 4 to 16.
+
+       xo  Set horizontal axis offset for output signal. Default value is 0.
+
+       yo  Set vertical axis offset for output signal. Default value is 0.
+
+       to  Set time axis offset for output signal. Default value is 0.
+
+       k0  Set 0-order, constant added to signal phase. Default value is 0.
+
+       kx  Set 1-order, phase factor multiplier for horizontal axis. Default
+	   value is 0.
+
+       ky  Set 1-order, phase factor multiplier for vertical axis. Default
+	   value is 0.
+
+       kt  Set 1-order, phase factor multiplier for time axis. Default value
+	   is 0.
+
+       kxt, kyt, kxy
+	   Set phase factor multipliers for combination of spatial and
+	   temporal axis.  Default value is 0.
+
+       kx2 Set 2-order, phase factor multiplier for horizontal axis. Default
+	   value is 0.
+
+       ky2 Set 2-order, phase factor multiplier for vertical axis. Default
+	   value is 0.
+
+       kt2 Set 2-order, phase factor multiplier for time axis. Default value
+	   is 0.
+
+       ku  Set the constant added to final phase to produce chroma-blue
+	   component of signal.  Default value is 0.
+
+       kv  Set the constant added to final phase to produce chroma-red
+	   component of signal.  Default value is 0.
+
+       Commands
+
+       This source supports the some above options as commands.
+
+       Examples
+
+       o   Generate horizontal color sine sweep:
+
+		   zoneplate=ku=512:kv=0:kt2=0:kx2=256:s=wvga:xo=-426:kt=11
+
+       o   Generate vertical color sine sweep:
+
+		   zoneplate=ku=512:kv=0:kt2=0:ky2=156:s=wvga:yo=-240:kt=11
+
+       o   Generate circular zone-plate:
+
+		   zoneplate=ku=512:kv=100:kt2=0:ky2=256:kx2=556:s=wvga:yo=0:kt=11
+
+VIDEO SINKS
+       Below is a description of the currently available video sinks.
+
+   buffersink
+       Buffer video frames, and make them available to the end of the filter
+       graph.
+
+       This sink is mainly intended for programmatic use, in particular
+       through the interface defined in libavfilter/buffersink.h or the
+       options system.
+
+       It accepts a pointer to an AVBufferSinkContext structure, which defines
+       the incoming buffers' formats, to be passed as the opaque parameter to
+       "avfilter_init_filter" for initialization.
+
+   nullsink
+       Null video sink: do absolutely nothing with the input video. It is
+       mainly useful as a template and for use in analysis / debugging tools.
+
+MULTIMEDIA FILTERS
+       Below is a description of the currently available multimedia filters.
+
+   a3dscope
+       Convert input audio to 3d scope video output.
+
+       The filter accepts the following options:
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "hd720".
+
+       fov Set the camera field of view. Default is 90 degrees.  Allowed range
+	   is from 40 to 150.
+
+       roll
+	   Set the camera roll.
+
+       pitch
+	   Set the camera pitch.
+
+       yaw Set the camera yaw.
+
+       xzoom
+	   Set the camera zoom on X-axis.
+
+       yzoom
+	   Set the camera zoom on Y-axis.
+
+       zzoom
+	   Set the camera zoom on Z-axis.
+
+       xpos
+	   Set the camera position on X-axis.
+
+       ypos
+	   Set the camera position on Y-axis.
+
+       zpos
+	   Set the camera position on Z-axis.
+
+       length
+	   Set the length of displayed audio waves in number of frames.
+
+       Commands
+
+       Filter supports the some above options as commands.
+
+   abitscope
+       Convert input audio to a video output, displaying the audio bit scope.
+
+       The filter accepts the following options:
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "1024x256".
+
+       colors
+	   Specify list of colors separated by space or by '|' which will be
+	   used to draw channels. Unrecognized or missing colors will be
+	   replaced by white color.
+
+       mode, m
+	   Set output mode. Can be "bars" or "trace". Default is "bars".
+
+   adrawgraph
+       Draw a graph using input audio metadata.
+
+       See drawgraph
+
+   agraphmonitor
+       See graphmonitor.
+
+   ahistogram
+       Convert input audio to a video output, displaying the volume histogram.
+
+       The filter accepts the following options:
+
+       dmode
+	   Specify how histogram is calculated.
+
+	   It accepts the following values:
+
+	   single
+	       Use single histogram for all channels.
+
+	   separate
+	       Use separate histogram for each channel.
+
+	   Default is "single".
+
+       rate, r
+	   Set frame rate, expressed as number of frames per second. Default
+	   value is "25".
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "hd720".
+
+       scale
+	   Set display scale.
+
+	   It accepts the following values:
+
+	   log logarithmic
+
+	   sqrt
+	       square root
+
+	   cbrt
+	       cubic root
+
+	   lin linear
+
+	   rlog
+	       reverse logarithmic
+
+	   Default is "log".
+
+       ascale
+	   Set amplitude scale.
+
+	   It accepts the following values:
+
+	   log logarithmic
+
+	   lin linear
+
+	   Default is "log".
+
+       acount
+	   Set how much frames to accumulate in histogram.  Default is 1.
+	   Setting this to -1 accumulates all frames.
+
+       rheight
+	   Set histogram ratio of window height.
+
+       slide
+	   Set sonogram sliding.
+
+	   It accepts the following values:
+
+	   replace
+	       replace old rows with new ones.
+
+	   scroll
+	       scroll from top to bottom.
+
+	   Default is "replace".
+
+       hmode
+	   Set histogram mode.
+
+	   It accepts the following values:
+
+	   abs Use absolute values of samples.
+
+	   sign
+	       Use untouched values of samples.
+
+	   Default is "abs".
+
+   aphasemeter
+       Measures phase of input audio, which is exported as metadata
+       "lavfi.aphasemeter.phase", representing mean phase of current audio
+       frame. A video output can also be produced and is enabled by default.
+       The audio is passed through as first output.
+
+       Audio will be rematrixed to stereo if it has a different channel
+       layout. Phase value is in range "[-1, 1]" where "-1" means left and
+       right channels are completely out of phase and 1 means channels are in
+       phase.
+
+       The filter accepts the following options, all related to its video
+       output:
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+       size, s
+	   Set the video size for the output. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.  Default
+	   value is "800x400".
+
+       rc
+       gc
+       bc  Specify the red, green, blue contrast. Default values are 2, 7 and
+	   1.  Allowed range is "[0, 255]".
+
+       mpc Set color which will be used for drawing median phase. If color is
+	   "none" which is default, no median phase value will be drawn.
+
+       video
+	   Enable video output. Default is enabled.
+
+       phasing detection
+
+       The filter also detects out of phase and mono sequences in stereo
+       streams.  It logs the sequence start, end and duration when it lasts
+       longer or as long as the minimum set.
+
+       The filter accepts the following options for this detection:
+
+       phasing
+	   Enable mono and out of phase detection. Default is disabled.
+
+       tolerance, t
+	   Set phase tolerance for mono detection, in amplitude ratio. Default
+	   is 0.  Allowed range is "[0, 1]".
+
+       angle, a
+	   Set angle threshold for out of phase detection, in degree. Default
+	   is 170.  Allowed range is "[90, 180]".
+
+       duration, d
+	   Set mono or out of phase duration until notification, expressed in
+	   seconds. Default is 2.
+
+       Examples
+
+       o   Complete example with ffmpeg to detect 1 second of mono with 0.001
+	   phase tolerance:
+
+		   ffmpeg -i stereo.wav -af aphasemeter=video=0:phasing=1:duration=1:tolerance=0.001 -f null -
+
+   avectorscope
+       Convert input audio to a video output, representing the audio vector
+       scope.
+
+       The filter is used to measure the difference between channels of stereo
+       audio stream. A monaural signal, consisting of identical left and right
+       signal, results in straight vertical line. Any stereo separation is
+       visible as a deviation from this line, creating a Lissajous figure.  If
+       the straight (or deviation from it) but horizontal line appears this
+       indicates that the left and right channels are out of phase.
+
+       The filter accepts the following options:
+
+       mode, m
+	   Set the vectorscope mode.
+
+	   Available values are:
+
+	   lissajous
+	       Lissajous rotated by 45 degrees.
+
+	   lissajous_xy
+	       Same as above but not rotated.
+
+	   polar
+	       Shape resembling half of circle.
+
+	   Default value is lissajous.
+
+       size, s
+	   Set the video size for the output. For the syntax of this option,
+	   check the "Video size" section in the ffmpeg-utils manual.  Default
+	   value is "400x400".
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+       rc
+       gc
+       bc
+       ac  Specify the red, green, blue and alpha contrast. Default values are
+	   40, 160, 80 and 255.  Allowed range is "[0, 255]".
+
+       rf
+       gf
+       bf
+       af  Specify the red, green, blue and alpha fade. Default values are 15,
+	   10, 5 and 5.  Allowed range is "[0, 255]".
+
+       zoom
+	   Set the zoom factor. Default value is 1. Allowed range is "[0,
+	   10]".  Values lower than 1 will auto adjust zoom factor to maximal
+	   possible value.
+
+       draw
+	   Set the vectorscope drawing mode.
+
+	   Available values are:
+
+	   dot Draw dot for each sample.
+
+	   line
+	       Draw line between previous and current sample.
+
+	   aaline
+	       Draw anti-aliased line between previous and current sample.
+
+	   Default value is dot.
+
+       scale
+	   Specify amplitude scale of audio samples.
+
+	   Available values are:
+
+	   lin Linear.
+
+	   sqrt
+	       Square root.
+
+	   cbrt
+	       Cubic root.
+
+	   log Logarithmic.
+
+       swap
+	   Swap left channel axis with right channel axis.
+
+       mirror
+	   Mirror axis.
+
+	   none
+	       No mirror.
+
+	   x   Mirror only x axis.
+
+	   y   Mirror only y axis.
+
+	   xy  Mirror both axis.
+
+       Examples
+
+       o   Complete example using ffplay:
+
+		   ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1];
+				[a] avectorscope=zoom=1.3:rc=2:gc=200:bc=10:rf=1:gf=8:bf=7 [out0]'
+
+       Commands
+
+       This filter supports the all above options as commands except options
+       "size" and "rate".
+
+   bench, abench
+       Benchmark part of a filtergraph.
+
+       The filter accepts the following options:
+
+       action
+	   Start or stop a timer.
+
+	   Available values are:
+
+	   start
+	       Get the current time, set it as frame metadata (using the key
+	       "lavfi.bench.start_time"), and forward the frame to the next
+	       filter.
+
+	   stop
+	       Get the current time and fetch the "lavfi.bench.start_time"
+	       metadata from the input frame metadata to get the time
+	       difference. Time difference, average, maximum and minimum time
+	       (respectively "t", "avg", "max" and "min") are then printed.
+	       The timestamps are expressed in seconds.
+
+       Examples
+
+       o   Benchmark selectivecolor filter:
+
+		   bench=start,selectivecolor=reds=-.2 .12 -.49,bench=stop
+
+   concat
+       Concatenate audio and video streams, joining them together one after
+       the other.
+
+       The filter works on segments of synchronized video and audio streams.
+       All segments must have the same number of streams of each type, and
+       that will also be the number of streams at output.
+
+       The filter accepts the following options:
+
+       n   Set the number of segments. Default is 2.
+
+       v   Set the number of output video streams, that is also the number of
+	   video streams in each segment. Default is 1.
+
+       a   Set the number of output audio streams, that is also the number of
+	   audio streams in each segment. Default is 0.
+
+       unsafe
+	   Activate unsafe mode: do not fail if segments have a different
+	   format.
+
+       The filter has v+a outputs: first v video outputs, then a audio
+       outputs.
+
+       There are nx(v+a) inputs: first the inputs for the first segment, in
+       the same order as the outputs, then the inputs for the second segment,
+       etc.
+
+       Related streams do not always have exactly the same duration, for
+       various reasons including codec frame size or sloppy authoring. For
+       that reason, related synchronized streams (e.g. a video and its audio
+       track) should be concatenated at once. The concat filter will use the
+       duration of the longest stream in each segment (except the last one),
+       and if necessary pad shorter audio streams with silence.
+
+       For this filter to work correctly, all segments must start at timestamp
+       0.
+
+       All corresponding streams must have the same parameters in all
+       segments; the filtering system will automatically select a common pixel
+       format for video streams, and a common sample format, sample rate and
+       channel layout for audio streams, but other settings, such as
+       resolution, must be converted explicitly by the user.
+
+       Different frame rates are acceptable but will result in variable frame
+       rate at output; be sure to configure the output file to handle it.
+
+       Examples
+
+       o   Concatenate an opening, an episode and an ending, all in bilingual
+	   version (video in stream 0, audio in streams 1 and 2):
+
+		   ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv -filter_complex \
+		     '[0:0] [0:1] [0:2] [1:0] [1:1] [1:2] [2:0] [2:1] [2:2]
+		      concat=n=3:v=1:a=2 [v] [a1] [a2]' \
+		     -map '[v]' -map '[a1]' -map '[a2]' output.mkv
+
+       o   Concatenate two parts, handling audio and video separately, using
+	   the (a)movie sources, and adjusting the resolution:
+
+		   movie=part1.mp4, scale=512:288 [v1] ; amovie=part1.mp4 [a1] ;
+		   movie=part2.mp4, scale=512:288 [v2] ; amovie=part2.mp4 [a2] ;
+		   [v1] [v2] concat [outv] ; [a1] [a2] concat=v=0:a=1 [outa]
+
+	   Note that a desync will happen at the stitch if the audio and video
+	   streams do not have exactly the same duration in the first file.
+
+       Commands
+
+       This filter supports the following commands:
+
+       next
+	   Close the current segment and step to the next one
+
+   ebur128
+       EBU R128 scanner filter. This filter takes an audio stream and analyzes
+       its loudness level. By default, it logs a message at a frequency of
+       10Hz with the Momentary loudness (identified by "M"), Short-term
+       loudness ("S"), Integrated loudness ("I") and Loudness Range ("LRA").
+
+       The filter can only analyze streams which have sample format is double-
+       precision floating point. The input stream will be converted to this
+       specification, if needed. Users may need to insert aformat and/or
+       aresample filters after this filter to obtain the original parameters.
+
+       The filter also has a video output (see the video option) with a real
+       time graph to observe the loudness evolution. The graphic contains the
+       logged message mentioned above, so it is not printed anymore when this
+       option is set, unless the verbose logging is set. The main graphing
+       area contains the short-term loudness (3 seconds of analysis), and the
+       gauge on the right is for the momentary loudness (400 milliseconds),
+       but can optionally be configured to instead display short-term loudness
+       (see gauge).
+
+       The green area marks a  +/- 1LU target range around the target loudness
+       (-23LUFS by default, unless modified through target).
+
+       More information about the Loudness Recommendation EBU R128 on
+       <http://tech.ebu.ch/loudness>.
+
+       The filter accepts the following options:
+
+       video
+	   Activate the video output. The audio stream is passed unchanged
+	   whether this option is set or no. The video stream will be the
+	   first output stream if activated. Default is 0.
+
+       size
+	   Set the video size. This option is for video only. For the syntax
+	   of this option, check the "Video size" section in the ffmpeg-utils
+	   manual.  Default and minimum resolution is "640x480".
+
+       meter
+	   Set the EBU scale meter. Default is 9. Common values are 9 and 18,
+	   respectively for EBU scale meter +9 and EBU scale meter +18. Any
+	   other integer value between this range is allowed.
+
+       metadata
+	   Set metadata injection. If set to 1, the audio input will be
+	   segmented into 100ms output frames, each of them containing various
+	   loudness information in metadata.  All the metadata keys are
+	   prefixed with "lavfi.r128.".
+
+	   Default is 0.
+
+       framelog
+	   Force the frame logging level.
+
+	   Available values are:
+
+	   quiet
+	       logging disabled
+
+	   info
+	       information logging level
+
+	   verbose
+	       verbose logging level
+
+	   By default, the logging level is set to info. If the video or the
+	   metadata options are set, it switches to verbose.
+
+       peak
+	   Set peak mode(s).
+
+	   Available modes can be cumulated (the option is a "flag" type).
+	   Possible values are:
+
+	   none
+	       Disable any peak mode (default).
+
+	   sample
+	       Enable sample-peak mode.
+
+	       Simple peak mode looking for the higher sample value. It logs a
+	       message for sample-peak (identified by "SPK").
+
+	   true
+	       Enable true-peak mode.
+
+	       If enabled, the peak lookup is done on an over-sampled version
+	       of the input stream for better peak accuracy. It logs a message
+	       for true-peak.  (identified by "TPK") and true-peak per frame
+	       (identified by "FTPK").	This mode requires a build with
+	       "libswresample".
+
+       dualmono
+	   Treat mono input files as "dual mono". If a mono file is intended
+	   for playback on a stereo system, its EBU R128 measurement will be
+	   perceptually incorrect.  If set to "true", this option will
+	   compensate for this effect.	Multi-channel input files are not
+	   affected by this option.
+
+       panlaw
+	   Set a specific pan law to be used for the measurement of dual mono
+	   files.  This parameter is optional, and has a default value of
+	   -3.01dB.
+
+       target
+	   Set a specific target level (in LUFS) used as relative zero in the
+	   visualization.  This parameter is optional and has a default value
+	   of -23LUFS as specified by EBU R128. However, material published
+	   online may prefer a level of -16LUFS (e.g. for use with podcasts or
+	   video platforms).
+
+       gauge
+	   Set the value displayed by the gauge. Valid values are "momentary"
+	   and s "shortterm". By default the momentary value will be used, but
+	   in certain scenarios it may be more useful to observe the short
+	   term value instead (e.g.  live mixing).
+
+       scale
+	   Sets the display scale for the loudness. Valid parameters are
+	   "absolute" (in LUFS) or "relative" (LU) relative to the target.
+	   This only affects the video output, not the summary or continuous
+	   log output.
+
+       integrated
+	   Read-only exported value for measured integrated loudness, in LUFS.
+
+       range
+	   Read-only exported value for measured loudness range, in LU.
+
+       lra_low
+	   Read-only exported value for measured LRA low, in LUFS.
+
+       lra_high
+	   Read-only exported value for measured LRA high, in LUFS.
+
+       sample_peak
+	   Read-only exported value for measured sample peak, in dBFS.
+
+       true_peak
+	   Read-only exported value for measured true peak, in dBFS.
+
+       Examples
+
+       o   Real-time graph using ffplay, with a EBU scale meter +18:
+
+		   ffplay -f lavfi -i "amovie=input.mp3,ebur128=video=1:meter=18 [out0][out1]"
+
+       o   Run an analysis with ffmpeg:
+
+		   ffmpeg -nostats -i input.mp3 -filter_complex ebur128 -f null -
+
+   interleave, ainterleave
+       Temporally interleave frames from several inputs.
+
+       "interleave" works with video inputs, "ainterleave" with audio.
+
+       These filters read frames from several inputs and send the oldest
+       queued frame to the output.
+
+       Input streams must have well defined, monotonically increasing frame
+       timestamp values.
+
+       In order to submit one frame to output, these filters need to enqueue
+       at least one frame for each input, so they cannot work in case one
+       input is not yet terminated and will not receive incoming frames.
+
+       For example consider the case when one input is a "select" filter which
+       always drops input frames. The "interleave" filter will keep reading
+       from that input, but it will never be able to send new frames to output
+       until the input sends an end-of-stream signal.
+
+       Also, depending on inputs synchronization, the filters will drop frames
+       in case one input receives more frames than the other ones, and the
+       queue is already filled.
+
+       These filters accept the following options:
+
+       nb_inputs, n
+	   Set the number of different inputs, it is 2 by default.
+
+       duration
+	   How to determine the end-of-stream.
+
+	   longest
+	       The duration of the longest input. (default)
+
+	   shortest
+	       The duration of the shortest input.
+
+	   first
+	       The duration of the first input.
+
+       Examples
+
+       o   Interleave frames belonging to different streams using ffmpeg:
+
+		   ffmpeg -i bambi.avi -i pr0n.mkv -filter_complex "[0:v][1:v] interleave" out.avi
+
+       o   Add flickering blur effect:
+
+		   select='if(gt(random(0), 0.2), 1, 2)':n=2 [tmp], boxblur=2:2, [tmp] interleave
+
+   latency, alatency
+       Measure filtering latency.
+
+       Report previous filter filtering latency, delay in number of audio
+       samples for audio filters or number of video frames for video filters.
+
+       On end of input stream, filter will report min and max measured latency
+       for previous running filter in filtergraph.
+
+   metadata, ametadata
+       Manipulate frame metadata.
+
+       This filter accepts the following options:
+
+       mode
+	   Set mode of operation of the filter.
+
+	   Can be one of the following:
+
+	   select
+	       If both "value" and "key" is set, select frames which have such
+	       metadata. If only "key" is set, select every frame that has
+	       such key in metadata.
+
+	   add Add new metadata "key" and "value". If key is already available
+	       do nothing.
+
+	   modify
+	       Modify value of already present key.
+
+	   delete
+	       If "value" is set, delete only keys that have such value.
+	       Otherwise, delete key. If "key" is not set, delete all metadata
+	       values in the frame.
+
+	   print
+	       Print key and its value if metadata was found. If "key" is not
+	       set print all metadata values available in frame.
+
+       key Set key used with all modes. Must be set for all modes except
+	   "print" and "delete".
+
+       value
+	   Set metadata value which will be used. This option is mandatory for
+	   "modify" and "add" mode.
+
+       function
+	   Which function to use when comparing metadata value and "value".
+
+	   Can be one of following:
+
+	   same_str
+	       Values are interpreted as strings, returns true if metadata
+	       value is same as "value".
+
+	   starts_with
+	       Values are interpreted as strings, returns true if metadata
+	       value starts with the "value" option string.
+
+	   less
+	       Values are interpreted as floats, returns true if metadata
+	       value is less than "value".
+
+	   equal
+	       Values are interpreted as floats, returns true if "value" is
+	       equal with metadata value.
+
+	   greater
+	       Values are interpreted as floats, returns true if metadata
+	       value is greater than "value".
+
+	   expr
+	       Values are interpreted as floats, returns true if expression
+	       from option "expr" evaluates to true.
+
+	   ends_with
+	       Values are interpreted as strings, returns true if metadata
+	       value ends with the "value" option string.
+
+       expr
+	   Set expression which is used when "function" is set to "expr".  The
+	   expression is evaluated through the eval API and can contain the
+	   following constants:
+
+	   VALUE1, FRAMEVAL
+	       Float representation of "value" from metadata key.
+
+	   VALUE2, USERVAL
+	       Float representation of "value" as supplied by user in "value"
+	       option.
+
+       file
+	   If specified in "print" mode, output is written to the named file.
+	   Instead of plain filename any writable url can be specified.
+	   Filename ``-'' is a shorthand for standard output. If "file" option
+	   is not set, output is written to the log with AV_LOG_INFO loglevel.
+
+       direct
+	   Reduces buffering in print mode when output is written to a URL set
+	   using file.
+
+       Examples
+
+       o   Print all metadata values for frames with key
+	   "lavfi.signalstats.YDIF" with values between 0 and 1.
+
+		   signalstats,metadata=print:key=lavfi.signalstats.YDIF:value=0:function=expr:expr='between(VALUE1,0,1)'
+
+       o   Print silencedetect output to file metadata.txt.
+
+		   silencedetect,ametadata=mode=print:file=metadata.txt
+
+       o   Direct all metadata to a pipe with file descriptor 4.
+
+		   metadata=mode=print:file='pipe\:4'
+
+   perms, aperms
+       Set read/write permissions for the output frames.
+
+       These filters are mainly aimed at developers to test direct path in the
+       following filter in the filtergraph.
+
+       The filters accept the following options:
+
+       mode
+	   Select the permissions mode.
+
+	   It accepts the following values:
+
+	   none
+	       Do nothing. This is the default.
+
+	   ro  Set all the output frames read-only.
+
+	   rw  Set all the output frames directly writable.
+
+	   toggle
+	       Make the frame read-only if writable, and writable if read-
+	       only.
+
+	   random
+	       Set each output frame read-only or writable randomly.
+
+       seed
+	   Set the seed for the random mode, must be an integer included
+	   between 0 and "UINT32_MAX". If not specified, or if explicitly set
+	   to "-1", the filter will try to use a good random seed on a best
+	   effort basis.
+
+       Note: in case of auto-inserted filter between the permission filter and
+       the following one, the permission might not be received as expected in
+       that following filter. Inserting a format or aformat filter before the
+       perms/aperms filter can avoid this problem.
+
+   realtime, arealtime
+       Slow down filtering to match real time approximately.
+
+       These filters will pause the filtering for a variable amount of time to
+       match the output rate with the input timestamps.  They are similar to
+       the re option to "ffmpeg".
+
+       They accept the following options:
+
+       limit
+	   Time limit for the pauses. Any pause longer than that will be
+	   considered a timestamp discontinuity and reset the timer. Default
+	   is 2 seconds.
+
+       speed
+	   Speed factor for processing. The value must be a float larger than
+	   zero.  Values larger than 1.0 will result in faster than realtime
+	   processing, smaller will slow processing down. The limit is
+	   automatically adapted accordingly. Default is 1.0.
+
+	   A processing speed faster than what is possible without these
+	   filters cannot be achieved.
+
+       Commands
+
+       Both filters supports the all above options as commands.
+
+   segment, asegment
+       Split single input stream into multiple streams.
+
+       This filter does opposite of concat filters.
+
+       "segment" works on video frames, "asegment" on audio samples.
+
+       This filter accepts the following options:
+
+       timestamps
+	   Timestamps of output segments separated by '|'. The first segment
+	   will run from the beginning of the input stream. The last segment
+	   will run until the end of the input stream
+
+       frames, samples
+	   Exact frame/sample count to split the segments.
+
+       In all cases, prefixing an each segment with '+' will make it relative
+       to the previous segment.
+
+       Examples
+
+       o   Split input audio stream into three output audio streams, starting
+	   at start of input audio stream and storing that in 1st output audio
+	   stream, then following at 60th second and storing than in 2nd
+	   output audio stream, and last after 150th second of input audio
+	   stream store in 3rd output audio stream:
+
+		   asegment=timestamps="60|150"
+
+   select, aselect
+       Select frames to pass in output.
+
+       This filter accepts the following options:
+
+       expr, e
+	   Set expression, which is evaluated for each input frame.
+
+	   If the expression is evaluated to zero, the frame is discarded.
+
+	   If the evaluation result is negative or NaN, the frame is sent to
+	   the first output; otherwise it is sent to the output with index
+	   "ceil(val)-1", assuming that the input index starts from 0.
+
+	   For example a value of 1.2 corresponds to the output with index
+	   "ceil(1.2)-1 = 2-1 = 1", that is the second output.
+
+       outputs, n
+	   Set the number of outputs. The output to which to send the selected
+	   frame is based on the result of the evaluation. Default value is 1.
+
+       The expression can contain the following constants:
+
+       n   The (sequential) number of the filtered frame, starting from 0.
+
+       selected_n
+	   The (sequential) number of the selected frame, starting from 0.
+
+       prev_selected_n
+	   The sequential number of the last selected frame. It's NAN if
+	   undefined.
+
+       TB  The timebase of the input timestamps.
+
+       pts The PTS (Presentation TimeStamp) of the filtered frame, expressed
+	   in TB units. It's NAN if undefined.
+
+       t   The PTS of the filtered frame, expressed in seconds. It's NAN if
+	   undefined.
+
+       prev_pts
+	   The PTS of the previously filtered frame. It's NAN if undefined.
+
+       prev_selected_pts
+	   The PTS of the last previously filtered frame. It's NAN if
+	   undefined.
+
+       prev_selected_t
+	   The PTS of the last previously selected frame, expressed in
+	   seconds. It's NAN if undefined.
+
+       start_pts
+	   The first PTS in the stream which is not NAN. It remains NAN if not
+	   found.
+
+       start_t
+	   The first PTS, in seconds, in the stream which is not NAN. It
+	   remains NAN if not found.
+
+       pict_type (video only)
+	   The type of the filtered frame. It can assume one of the following
+	   values:
+
+	   I
+	   P
+	   B
+	   S
+	   SI
+	   SP
+	   BI
+       interlace_type (video only)
+	   The frame interlace type. It can assume one of the following
+	   values:
+
+	   PROGRESSIVE
+	       The frame is progressive (not interlaced).
+
+	   TOPFIRST
+	       The frame is top-field-first.
+
+	   BOTTOMFIRST
+	       The frame is bottom-field-first.
+
+       consumed_sample_n (audio only)
+	   the number of selected samples before the current frame
+
+       samples_n (audio only)
+	   the number of samples in the current frame
+
+       sample_rate (audio only)
+	   the input sample rate
+
+       key This is 1 if the filtered frame is a key-frame, 0 otherwise.
+
+       pos the position in the file of the filtered frame, -1 if the
+	   information is not available (e.g. for synthetic video);
+	   deprecated, do not use
+
+       scene (video only)
+	   value between 0 and 1 to indicate a new scene; a low value reflects
+	   a low probability for the current frame to introduce a new scene,
+	   while a higher value means the current frame is more likely to be
+	   one (see the example below)
+
+       concatdec_select
+	   The concat demuxer can select only part of a concat input file by
+	   setting an inpoint and an outpoint, but the output packets may not
+	   be entirely contained in the selected interval. By using this
+	   variable, it is possible to skip frames generated by the concat
+	   demuxer which are not exactly contained in the selected interval.
+
+	   This works by comparing the frame pts against the
+	   lavf.concat.start_time and the lavf.concat.duration packet metadata
+	   values which are also present in the decoded frames.
+
+	   The concatdec_select variable is -1 if the frame pts is at least
+	   start_time and either the duration metadata is missing or the frame
+	   pts is less than start_time + duration, 0 otherwise, and NaN if the
+	   start_time metadata is missing.
+
+	   That basically means that an input frame is selected if its pts is
+	   within the interval set by the concat demuxer.
+
+       The default value of the select expression is "1".
+
+       Examples
+
+       o   Select all frames in input:
+
+		   select
+
+	   The example above is the same as:
+
+		   select=1
+
+       o   Skip all frames:
+
+		   select=0
+
+       o   Select only I-frames:
+
+		   select='eq(pict_type\,I)'
+
+       o   Select one frame every 100:
+
+		   select='not(mod(n\,100))'
+
+       o   Select only frames contained in the 10-20 time interval:
+
+		   select=between(t\,10\,20)
+
+       o   Select only I-frames contained in the 10-20 time interval:
+
+		   select=between(t\,10\,20)*eq(pict_type\,I)
+
+       o   Select frames with a minimum distance of 10 seconds:
+
+		   select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
+
+       o   Use aselect to select only audio frames with samples number > 100:
+
+		   aselect='gt(samples_n\,100)'
+
+       o   Create a mosaic of the first scenes:
+
+		   ffmpeg -i video.avi -vf select='gt(scene\,0.4)',scale=160:120,tile -frames:v 1 preview.png
+
+	   Comparing scene against a value between 0.3 and 0.5 is generally a
+	   sane choice.
+
+       o   Send even and odd frames to separate outputs, and compose them:
+
+		   select=n=2:e='mod(n, 2)+1' [odd][even]; [odd] pad=h=2*ih [tmp]; [tmp][even] overlay=y=h
+
+       o   Select useful frames from an ffconcat file which is using inpoints
+	   and outpoints but where the source files are not intra frame only.
+
+		   ffmpeg -copyts -vsync 0 -segment_time_metadata 1 -i input.ffconcat -vf select=concatdec_select -af aselect=concatdec_select output.avi
+
+   sendcmd, asendcmd
+       Send commands to filters in the filtergraph.
+
+       These filters read commands to be sent to other filters in the
+       filtergraph.
+
+       "sendcmd" must be inserted between two video filters, "asendcmd" must
+       be inserted between two audio filters, but apart from that they act the
+       same way.
+
+       The specification of commands can be provided in the filter arguments
+       with the commands option, or in a file specified by the filename
+       option.
+
+       These filters accept the following options:
+
+       commands, c
+	   Set the commands to be read and sent to the other filters.
+
+       filename, f
+	   Set the filename of the commands to be read and sent to the other
+	   filters.
+
+       Commands syntax
+
+       A commands description consists of a sequence of interval
+       specifications, comprising a list of commands to be executed when a
+       particular event related to that interval occurs. The occurring event
+       is typically the current frame time entering or leaving a given time
+       interval.
+
+       An interval is specified by the following syntax:
+
+	       <START>[-<END>] <COMMANDS>;
+
+       The time interval is specified by the START and END times.  END is
+       optional and defaults to the maximum time.
+
+       The current frame time is considered within the specified interval if
+       it is included in the interval [START, END), that is when the time is
+       greater or equal to START and is lesser than END.
+
+       COMMANDS consists of a sequence of one or more command specifications,
+       separated by ",", relating to that interval.  The syntax of a command
+       specification is given by:
+
+	       [<FLAGS>] <TARGET> <COMMAND> <ARG>
+
+       FLAGS is optional and specifies the type of events relating to the time
+       interval which enable sending the specified command, and must be a non-
+       null sequence of identifier flags separated by "+" or "|" and enclosed
+       between "[" and "]".
+
+       The following flags are recognized:
+
+       enter
+	   The command is sent when the current frame timestamp enters the
+	   specified interval. In other words, the command is sent when the
+	   previous frame timestamp was not in the given interval, and the
+	   current is.
+
+       leave
+	   The command is sent when the current frame timestamp leaves the
+	   specified interval. In other words, the command is sent when the
+	   previous frame timestamp was in the given interval, and the current
+	   is not.
+
+       expr
+	   The command ARG is interpreted as expression and result of
+	   expression is passed as ARG.
+
+	   The expression is evaluated through the eval API and can contain
+	   the following constants:
+
+	   POS Original position in the file of the frame, or undefined if
+	       undefined for the current frame. Deprecated, do not use.
+
+	   PTS The presentation timestamp in input.
+
+	   N   The count of the input frame for video or audio, starting from
+	       0.
+
+	   T   The time in seconds of the current frame.
+
+	   TS  The start time in seconds of the current command interval.
+
+	   TE  The end time in seconds of the current command interval.
+
+	   TI  The interpolated time of the current command interval, TI = (T
+	       - TS) / (TE - TS).
+
+	   W   The video frame width.
+
+	   H   The video frame height.
+
+       If FLAGS is not specified, a default value of "[enter]" is assumed.
+
+       TARGET specifies the target of the command, usually the name of the
+       filter class or a specific filter instance name.
+
+       COMMAND specifies the name of the command for the target filter.
+
+       ARG is optional and specifies the optional list of argument for the
+       given COMMAND.
+
+       Between one interval specification and another, whitespaces, or
+       sequences of characters starting with "#" until the end of line, are
+       ignored and can be used to annotate comments.
+
+       A simplified BNF description of the commands specification syntax
+       follows:
+
+	       <COMMAND_FLAG>  ::= "enter" | "leave"
+	       <COMMAND_FLAGS> ::= <COMMAND_FLAG> [(+|"|")<COMMAND_FLAG>]
+	       <COMMAND>       ::= ["[" <COMMAND_FLAGS> "]"] <TARGET> <COMMAND> [<ARG>]
+	       <COMMANDS>      ::= <COMMAND> [,<COMMANDS>]
+	       <INTERVAL>      ::= <START>[-<END>] <COMMANDS>
+	       <INTERVALS>     ::= <INTERVAL>[;<INTERVALS>]
+
+       Examples
+
+       o   Specify audio tempo change at second 4:
+
+		   asendcmd=c='4.0 atempo tempo 1.5',atempo
+
+       o   Target a specific filter instance:
+
+		   asendcmd=c='4.0 atempo@my tempo 1.5',atempo@my
+
+       o   Specify a list of drawtext and hue commands in a file.
+
+		   # show text in the interval 5-10
+		   5.0-10.0 [enter] drawtext reinit 'fontfile=FreeSerif.ttf:text=hello world',
+			    [leave] drawtext reinit 'fontfile=FreeSerif.ttf:text=';
+
+		   # desaturate the image in the interval 15-20
+		   15.0-20.0 [enter] hue s 0,
+			     [enter] drawtext reinit 'fontfile=FreeSerif.ttf:text=nocolor',
+			     [leave] hue s 1,
+			     [leave] drawtext reinit 'fontfile=FreeSerif.ttf:text=color';
+
+		   # apply an exponential saturation fade-out effect, starting from time 25
+		   25 [enter] hue s exp(25-t)
+
+	   A filtergraph allowing to read and process the above command list
+	   stored in a file test.cmd, can be specified with:
+
+		   sendcmd=f=test.cmd,drawtext=fontfile=FreeSerif.ttf:text='',hue
+
+   setpts, asetpts
+       Change the PTS (presentation timestamp) of the input frames.
+
+       "setpts" works on video frames, "asetpts" on audio frames.
+
+       This filter accepts the following options:
+
+       expr
+	   The expression which is evaluated for each frame to construct its
+	   timestamp.
+
+       The expression is evaluated through the eval API and can contain the
+       following constants:
+
+       FRAME_RATE, FR
+	   frame rate, only defined for constant frame-rate video
+
+       PTS The presentation timestamp in input
+
+       N   The count of the input frame for video or the number of consumed
+	   samples, not including the current frame for audio, starting from
+	   0.
+
+       NB_CONSUMED_SAMPLES
+	   The number of consumed samples, not including the current frame
+	   (only audio)
+
+       NB_SAMPLES, S
+	   The number of samples in the current frame (only audio)
+
+       SAMPLE_RATE, SR
+	   The audio sample rate.
+
+       STARTPTS
+	   The PTS of the first frame.
+
+       STARTT
+	   the time in seconds of the first frame
+
+       INTERLACED
+	   State whether the current frame is interlaced.
+
+       T   the time in seconds of the current frame
+
+       POS original position in the file of the frame, or undefined if
+	   undefined for the current frame; deprecated, do not use
+
+       PREV_INPTS
+	   The previous input PTS.
+
+       PREV_INT
+	   previous input time in seconds
+
+       PREV_OUTPTS
+	   The previous output PTS.
+
+       PREV_OUTT
+	   previous output time in seconds
+
+       RTCTIME
+	   The wallclock (RTC) time in microseconds. This is deprecated, use
+	   time(0) instead.
+
+       RTCSTART
+	   The wallclock (RTC) time at the start of the movie in microseconds.
+
+       TB  The timebase of the input timestamps.
+
+       T_CHANGE
+	   Time of the first frame after command was applied or time of the
+	   first frame if no commands.
+
+       Examples
+
+       o   Start counting PTS from zero
+
+		   setpts=PTS-STARTPTS
+
+       o   Apply fast motion effect:
+
+		   setpts=0.5*PTS
+
+       o   Apply slow motion effect:
+
+		   setpts=2.0*PTS
+
+       o   Set fixed rate of 25 frames per second:
+
+		   setpts=N/(25*TB)
+
+       o   Apply a random jitter effect of +/-100 TB units:
+
+		   setpts=PTS+randomi(0, -100\,100)
+
+       o   Set fixed rate 25 fps with some jitter:
+
+		   setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
+
+       o   Apply an offset of 10 seconds to the input PTS:
+
+		   setpts=PTS+10/TB
+
+       o   Generate timestamps from a "live source" and rebase onto the
+	   current timebase:
+
+		   setpts='(RTCTIME - RTCSTART) / (TB * 1000000)'
+
+       o   Generate timestamps by counting samples:
+
+		   asetpts=N/SR/TB
+
+       Commands
+
+       Both filters support all above options as commands.
+
+   setrange
+       Force color range for the output video frame.
+
+       The "setrange" filter marks the color range property for the output
+       frames. It does not change the input frame, but only sets the
+       corresponding property, which affects how the frame is treated by
+       following filters.
+
+       The filter accepts the following options:
+
+       range
+	   Available values are:
+
+	   auto
+	       Keep the same color range property.
+
+	   unspecified, unknown
+	       Set the color range as unspecified.
+
+	   limited, tv, mpeg
+	       Set the color range as limited.
+
+	   full, pc, jpeg
+	       Set the color range as full.
+
+   settb, asettb
+       Set the timebase to use for the output frames timestamps.  It is mainly
+       useful for testing timebase configuration.
+
+       It accepts the following parameters:
+
+       expr, tb
+	   The expression which is evaluated into the output timebase.
+
+       The value for tb is an arithmetic expression representing a rational.
+       The expression can contain the constants "AVTB" (the default timebase),
+       "intb" (the input timebase) and "sr" (the sample rate, audio only).
+       Default value is "intb".
+
+       Examples
+
+       o   Set the timebase to 1/25:
+
+		   settb=expr=1/25
+
+       o   Set the timebase to 1/10:
+
+		   settb=expr=0.1
+
+       o   Set the timebase to 1001/1000:
+
+		   settb=1+0.001
+
+       o   Set the timebase to 2*intb:
+
+		   settb=2*intb
+
+       o   Set the default timebase value:
+
+		   settb=AVTB
+
+   showcqt
+       Convert input audio to a video output representing frequency spectrum
+       logarithmically using Brown-Puckette constant Q transform algorithm
+       with direct frequency domain coefficient calculation (but the transform
+       itself is not really constant Q, instead the Q factor is actually
+       variable/clamped), with musical tone scale, from E0 to D#10.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. It must be even. For the
+	   syntax of this option, check the "Video size" section in the
+	   ffmpeg-utils manual.  Default value is "1920x1080".
+
+       fps, rate, r
+	   Set the output frame rate. Default value is 25.
+
+       bar_h
+	   Set the bargraph height. It must be even. Default value is "-1"
+	   which computes the bargraph height automatically.
+
+       axis_h
+	   Set the axis height. It must be even. Default value is "-1" which
+	   computes the axis height automatically.
+
+       sono_h
+	   Set the sonogram height. It must be even. Default value is "-1"
+	   which computes the sonogram height automatically.
+
+       fullhd
+	   Set the fullhd resolution. This option is deprecated, use size, s
+	   instead. Default value is 1.
+
+       sono_v, volume
+	   Specify the sonogram volume expression. It can contain variables:
+
+	   bar_v
+	       the bar_v evaluated expression
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option
+
+	   and functions:
+
+	   a_weighting(f)
+	       A-weighting of equal loudness
+
+	   b_weighting(f)
+	       B-weighting of equal loudness
+
+	   c_weighting(f)
+	       C-weighting of equal loudness.
+
+	   Default value is 16.
+
+       bar_v, volume2
+	   Specify the bargraph volume expression. It can contain variables:
+
+	   sono_v
+	       the sono_v evaluated expression
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option
+
+	   and functions:
+
+	   a_weighting(f)
+	       A-weighting of equal loudness
+
+	   b_weighting(f)
+	       B-weighting of equal loudness
+
+	   c_weighting(f)
+	       C-weighting of equal loudness.
+
+	   Default value is "sono_v".
+
+       sono_g, gamma
+	   Specify the sonogram gamma. Lower gamma makes the spectrum more
+	   contrast, higher gamma makes the spectrum having more range.
+	   Default value is 3.	Acceptable range is "[1, 7]".
+
+       bar_g, gamma2
+	   Specify the bargraph gamma. Default value is 1. Acceptable range is
+	   "[1, 7]".
+
+       bar_t
+	   Specify the bargraph transparency level. Lower value makes the
+	   bargraph sharper.  Default value is 1. Acceptable range is "[0,
+	   1]".
+
+       timeclamp, tc
+	   Specify the transform timeclamp. At low frequency, there is trade-
+	   off between accuracy in time domain and frequency domain. If
+	   timeclamp is lower, event in time domain is represented more
+	   accurately (such as fast bass drum), otherwise event in frequency
+	   domain is represented more accurately (such as bass guitar).
+	   Acceptable range is "[0.002, 1]". Default value is 0.17.
+
+       attack
+	   Set attack time in seconds. The default is 0 (disabled). Otherwise,
+	   it limits future samples by applying asymmetric windowing in time
+	   domain, useful when low latency is required. Accepted range is "[0,
+	   1]".
+
+       basefreq
+	   Specify the transform base frequency. Default value is
+	   20.01523126408007475, which is frequency 50 cents below E0.
+	   Acceptable range is "[10, 100000]".
+
+       endfreq
+	   Specify the transform end frequency. Default value is
+	   20495.59681441799654, which is frequency 50 cents above D#10.
+	   Acceptable range is "[10, 100000]".
+
+       coeffclamp
+	   This option is deprecated and ignored.
+
+       tlength
+	   Specify the transform length in time domain. Use this option to
+	   control accuracy trade-off between time domain and frequency domain
+	   at every frequency sample.  It can contain variables:
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option.
+
+	   Default value is "384*tc/(384+tc*f)".
+
+       count
+	   Specify the transform count for every video frame. Default value is
+	   6.  Acceptable range is "[1, 30]".
+
+       fcount
+	   Specify the transform count for every single pixel. Default value
+	   is 0, which makes it computed automatically. Acceptable range is
+	   "[0, 10]".
+
+       fontfile
+	   Specify font file for use with freetype to draw the axis. If not
+	   specified, use embedded font. Note that drawing with font file or
+	   embedded font is not implemented with custom basefreq and endfreq,
+	   use axisfile option instead.
+
+       font
+	   Specify fontconfig pattern. This has lower priority than fontfile.
+	   The ":" in the pattern may be replaced by "|" to avoid unnecessary
+	   escaping.
+
+       fontcolor
+	   Specify font color expression. This is arithmetic expression that
+	   should return integer value 0xRRGGBB. It can contain variables:
+
+	   frequency, freq, f
+	       the frequency where it is evaluated
+
+	   timeclamp, tc
+	       the value of timeclamp option
+
+	   and functions:
+
+	   midi(f)
+	       midi number of frequency f, some midi numbers: E0(16), C1(24),
+	       C2(36), A4(69)
+
+	   r(x), g(x), b(x)
+	       red, green, and blue value of intensity x.
+
+	   Default value is "st(0, (midi(f)-59.5)/12); st(1,
+	   if(between(ld(0),0,1), 0.5-0.5*cos(2*PI*ld(0)), 0)); r(1-ld(1)) +
+	   b(ld(1))".
+
+       axisfile
+	   Specify image file to draw the axis. This option override fontfile
+	   and fontcolor option.
+
+       axis, text
+	   Enable/disable drawing text to the axis. If it is set to 0, drawing
+	   to the axis is disabled, ignoring fontfile and axisfile option.
+	   Default value is 1.
+
+       csp Set colorspace. The accepted values are:
+
+	   unspecified
+	       Unspecified (default)
+
+	   bt709
+	       BT.709
+
+	   fcc FCC
+
+	   bt470bg
+	       BT.470BG or BT.601-6 625
+
+	   smpte170m
+	       SMPTE-170M or BT.601-6 525
+
+	   smpte240m
+	       SMPTE-240M
+
+	   bt2020ncl
+	       BT.2020 with non-constant luminance
+
+       cscheme
+	   Set spectrogram color scheme. This is list of floating point values
+	   with format "left_r|left_g|left_b|right_r|right_g|right_b".	The
+	   default is "1|0.5|0|0|0.5|1".
+
+       Examples
+
+       o   Playing audio while showing the spectrum:
+
+		   ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt [out0]'
+
+       o   Same as above, but with frame rate 30 fps:
+
+		   ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=fps=30:count=5 [out0]'
+
+       o   Playing at 1280x720:
+
+		   ffplay -f lavfi 'amovie=a.mp3, asplit [a][out1]; [a] showcqt=s=1280x720:count=4 [out0]'
+
+       o   Disable sonogram display:
+
+		   sono_h=0
+
+       o   A1 and its harmonics: A1, A2, (near)E3, A3:
+
+		   ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
+				    asplit[a][out1]; [a] showcqt [out0]'
+
+       o   Same as above, but with more accuracy in frequency domain:
+
+		   ffplay -f lavfi 'aevalsrc=0.1*sin(2*PI*55*t)+0.1*sin(4*PI*55*t)+0.1*sin(6*PI*55*t)+0.1*sin(8*PI*55*t),
+				    asplit[a][out1]; [a] showcqt=timeclamp=0.5 [out0]'
+
+       o   Custom volume:
+
+		   bar_v=10:sono_v=bar_v*a_weighting(f)
+
+       o   Custom gamma, now spectrum is linear to the amplitude.
+
+		   bar_g=2:sono_g=2
+
+       o   Custom tlength equation:
+
+		   tc=0.33:tlength='st(0,0.17); 384*tc / (384 / ld(0) + tc*f /(1-ld(0))) + 384*tc / (tc*f / ld(0) + 384 /(1-ld(0)))'
+
+       o   Custom fontcolor and fontfile, C-note is colored green, others are
+	   colored blue:
+
+		   fontcolor='if(mod(floor(midi(f)+0.5),12), 0x0000FF, g(1))':fontfile=myfont.ttf
+
+       o   Custom font using fontconfig:
+
+		   font='Courier New,Monospace,mono|bold'
+
+       o   Custom frequency range with custom axis using image file:
+
+		   axisfile=myaxis.png:basefreq=40:endfreq=10000
+
+   showcwt
+       Convert input audio to video output representing frequency spectrum
+       using Continuous Wavelet Transform and Morlet wavelet.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "640x512".
+
+       rate, r
+	   Set the output frame rate. Default value is 25.
+
+       scale
+	   Set the frequency scale used. Allowed values are:
+
+	   linear
+	   log
+	   bark
+	   mel
+	   erbs
+	   sqrt
+	   cbrt
+	   qdrt
+	   fm
+
+	   Default value is "linear".
+
+       iscale
+	   Set the intensity scale used. Allowed values are:
+
+	   linear
+	   log
+	   sqrt
+	   cbrt
+	   qdrt
+
+	   Default value is "log".
+
+       min Set the minimum frequency that will be used in output.  Default is
+	   20 Hz.
+
+       max Set the maximum frequency that will be used in output.  Default is
+	   20000 Hz. The real frequency upper limit depends on input audio's
+	   sample rate and such will be enforced on this value when it is set
+	   to value greater than Nyquist frequency.
+
+       imin
+	   Set the minimum intensity that will be used in output.
+
+       imax
+	   Set the maximum intensity that will be used in output.
+
+       logb
+	   Set the logarithmic basis for brightness strength when mapping
+	   calculated magnitude values to pixel values.  Allowed range is from
+	   0 to 1.  Default value is 0.0001.
+
+       deviation
+	   Set the frequency deviation.  Lower values than 1 are more
+	   frequency oriented, while higher values than 1 are more time
+	   oriented.  Allowed range is from 0 to 10.  Default value is 1.
+
+       pps Set the number of pixel output per each second in one row.  Allowed
+	   range is from 1 to 1024.  Default value is 64.
+
+       mode
+	   Set the output visual mode. Allowed values are:
+
+	   magnitude
+	       Show magnitude.
+
+	   phase
+	       Show only phase.
+
+	   magphase
+	       Show combination of magnitude and phase.  Magnitude is mapped
+	       to brightness and phase to color.
+
+	   channel
+	       Show unique color per channel magnitude.
+
+	   stereo
+	       Show unique color per stereo difference.
+
+	   Default value is "magnitude".
+
+       slide
+	   Set the output slide method. Allowed values are:
+
+	   replace
+	   scroll
+	   frame
+       direction
+	   Set the direction method for output slide method. Allowed values
+	   are:
+
+	   lr  Direction from left to right.
+
+	   rl  Direction from right to left.
+
+	   ud  Direction from up to down.
+
+	   du  Direction from down to up.
+
+       bar Set the ratio of bargraph display to display size. Default is 0.
+
+       rotation
+	   Set color rotation, must be in [-1.0, 1.0] range.  Default value is
+	   0.
+
+   showfreqs
+       Convert input audio to video output representing the audio power
+       spectrum.  Audio amplitude is on Y-axis while frequency is on X-axis.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify size of video. For the syntax of this option, check the
+	   "Video size" section in the ffmpeg-utils manual.  Default is
+	   "1024x512".
+
+       rate, r
+	   Set video rate. Default is 25.
+
+       mode
+	   Set display mode.  This set how each frequency bin will be
+	   represented.
+
+	   It accepts the following values:
+
+	   line
+	   bar
+	   dot
+
+	   Default is "bar".
+
+       ascale
+	   Set amplitude scale.
+
+	   It accepts the following values:
+
+	   lin Linear scale.
+
+	   sqrt
+	       Square root scale.
+
+	   cbrt
+	       Cubic root scale.
+
+	   log Logarithmic scale.
+
+	   Default is "log".
+
+       fscale
+	   Set frequency scale.
+
+	   It accepts the following values:
+
+	   lin Linear scale.
+
+	   log Logarithmic scale.
+
+	   rlog
+	       Reverse logarithmic scale.
+
+	   Default is "lin".
+
+       win_size
+	   Set window size. Allowed range is from 16 to 65536.
+
+	   Default is 2048
+
+       win_func
+	   Set windowing function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default is "hanning".
+
+       overlap
+	   Set window overlap. In range "[0, 1]". Default is 1, which means
+	   optimal overlap for selected window function will be picked.
+
+       averaging
+	   Set time averaging. Setting this to 0 will display current maximal
+	   peaks.  Default is 1, which means time averaging is disabled.
+
+       colors
+	   Specify list of colors separated by space or by '|' which will be
+	   used to draw channel frequencies. Unrecognized or missing colors
+	   will be replaced by white color.
+
+       cmode
+	   Set channel display mode.
+
+	   It accepts the following values:
+
+	   combined
+	   separate
+
+	   Default is "combined".
+
+       minamp
+	   Set minimum amplitude used in "log" amplitude scaler.
+
+       data
+	   Set data display mode.
+
+	   It accepts the following values:
+
+	   magnitude
+	   phase
+	   delay
+
+	   Default is "magnitude".
+
+       channels
+	   Set channels to use when processing audio. By default all are
+	   processed.
+
+   showspatial
+       Convert stereo input audio to a video output, representing the spatial
+       relationship between two channels.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "512x512".
+
+       win_size
+	   Set window size. Allowed range is from 1024 to 65536. Default size
+	   is 4096.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default value is "hann".
+
+       rate, r
+	   Set output framerate.
+
+   showspectrum
+       Convert input audio to a video output, representing the audio frequency
+       spectrum.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "640x512".
+
+       slide
+	   Specify how the spectrum should slide along the window.
+
+	   It accepts the following values:
+
+	   replace
+	       the samples start again on the left when they reach the right
+
+	   scroll
+	       the samples scroll from right to left
+
+	   fullframe
+	       frames are only produced when the samples reach the right
+
+	   rscroll
+	       the samples scroll from left to right
+
+	   lreplace
+	       the samples start again on the right when they reach the left
+
+	   Default value is "replace".
+
+       mode
+	   Specify display mode.
+
+	   It accepts the following values:
+
+	   combined
+	       all channels are displayed in the same row
+
+	   separate
+	       all channels are displayed in separate rows
+
+	   Default value is combined.
+
+       color
+	   Specify display color mode.
+
+	   It accepts the following values:
+
+	   channel
+	       each channel is displayed in a separate color
+
+	   intensity
+	       each channel is displayed using the same color scheme
+
+	   rainbow
+	       each channel is displayed using the rainbow color scheme
+
+	   moreland
+	       each channel is displayed using the moreland color scheme
+
+	   nebulae
+	       each channel is displayed using the nebulae color scheme
+
+	   fire
+	       each channel is displayed using the fire color scheme
+
+	   fiery
+	       each channel is displayed using the fiery color scheme
+
+	   fruit
+	       each channel is displayed using the fruit color scheme
+
+	   cool
+	       each channel is displayed using the cool color scheme
+
+	   magma
+	       each channel is displayed using the magma color scheme
+
+	   green
+	       each channel is displayed using the green color scheme
+
+	   viridis
+	       each channel is displayed using the viridis color scheme
+
+	   plasma
+	       each channel is displayed using the plasma color scheme
+
+	   cividis
+	       each channel is displayed using the cividis color scheme
+
+	   terrain
+	       each channel is displayed using the terrain color scheme
+
+	   Default value is channel.
+
+       scale
+	   Specify scale used for calculating intensity color values.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   sqrt
+	       square root, default
+
+	   cbrt
+	       cubic root
+
+	   log logarithmic
+
+	   4thrt
+	       4th root
+
+	   5thrt
+	       5th root
+
+	   Default value is sqrt.
+
+       fscale
+	   Specify frequency scale.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   log logarithmic
+
+	   Default value is lin.
+
+       saturation
+	   Set saturation modifier for displayed colors. Negative values
+	   provide alternative color scheme. 0 is no saturation at all.
+	   Saturation must be in [-10.0, 10.0] range.  Default value is 1.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default value is "hann".
+
+       orientation
+	   Set orientation of time vs frequency axis. Can be "vertical" or
+	   "horizontal". Default is "vertical".
+
+       overlap
+	   Set ratio of overlap window. Default value is 0.  When value is 1
+	   overlap is set to recommended size for specific window function
+	   currently used.
+
+       gain
+	   Set scale gain for calculating intensity color values.  Default
+	   value is 1.
+
+       data
+	   Set which data to display. Can be "magnitude", default or "phase",
+	   or unwrapped phase: "uphase".
+
+       rotation
+	   Set color rotation, must be in [-1.0, 1.0] range.  Default value is
+	   0.
+
+       start
+	   Set start frequency from which to display spectrogram. Default is
+	   0.
+
+       stop
+	   Set stop frequency to which to display spectrogram. Default is 0.
+
+       fps Set upper frame rate limit. Default is "auto", unlimited.
+
+       legend
+	   Draw time and frequency axes and legends. Default is disabled.
+
+       drange
+	   Set dynamic range used to calculate intensity color values. Default
+	   is 120 dBFS.  Allowed range is from 10 to 200.
+
+       limit
+	   Set upper limit of input audio samples volume in dBFS. Default is 0
+	   dBFS.  Allowed range is from -100 to 100.
+
+       opacity
+	   Set opacity strength when using pixel format output with alpha
+	   component.
+
+       The usage is very similar to the showwaves filter; see the examples in
+       that section.
+
+       Examples
+
+       o   Large window with logarithmic color scaling:
+
+		   showspectrum=s=1280x480:scale=log
+
+       o   Complete example for a colored and sliding spectrum per channel
+	   using ffplay:
+
+		   ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1];
+				[a] showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt [out0]'
+
+   showspectrumpic
+       Convert input audio to a single video frame, representing the audio
+       frequency spectrum.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "4096x2048".
+
+       mode
+	   Specify display mode.
+
+	   It accepts the following values:
+
+	   combined
+	       all channels are displayed in the same row
+
+	   separate
+	       all channels are displayed in separate rows
+
+	   Default value is combined.
+
+       color
+	   Specify display color mode.
+
+	   It accepts the following values:
+
+	   channel
+	       each channel is displayed in a separate color
+
+	   intensity
+	       each channel is displayed using the same color scheme
+
+	   rainbow
+	       each channel is displayed using the rainbow color scheme
+
+	   moreland
+	       each channel is displayed using the moreland color scheme
+
+	   nebulae
+	       each channel is displayed using the nebulae color scheme
+
+	   fire
+	       each channel is displayed using the fire color scheme
+
+	   fiery
+	       each channel is displayed using the fiery color scheme
+
+	   fruit
+	       each channel is displayed using the fruit color scheme
+
+	   cool
+	       each channel is displayed using the cool color scheme
+
+	   magma
+	       each channel is displayed using the magma color scheme
+
+	   green
+	       each channel is displayed using the green color scheme
+
+	   viridis
+	       each channel is displayed using the viridis color scheme
+
+	   plasma
+	       each channel is displayed using the plasma color scheme
+
+	   cividis
+	       each channel is displayed using the cividis color scheme
+
+	   terrain
+	       each channel is displayed using the terrain color scheme
+
+	   Default value is intensity.
+
+       scale
+	   Specify scale used for calculating intensity color values.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   sqrt
+	       square root, default
+
+	   cbrt
+	       cubic root
+
+	   log logarithmic
+
+	   4thrt
+	       4th root
+
+	   5thrt
+	       5th root
+
+	   Default value is log.
+
+       fscale
+	   Specify frequency scale.
+
+	   It accepts the following values:
+
+	   lin linear
+
+	   log logarithmic
+
+	   Default value is lin.
+
+       saturation
+	   Set saturation modifier for displayed colors. Negative values
+	   provide alternative color scheme. 0 is no saturation at all.
+	   Saturation must be in [-10.0, 10.0] range.  Default value is 1.
+
+       win_func
+	   Set window function.
+
+	   It accepts the following values:
+
+	   rect
+	   bartlett
+	   hann
+	   hanning
+	   hamming
+	   blackman
+	   welch
+	   flattop
+	   bharris
+	   bnuttall
+	   bhann
+	   sine
+	   nuttall
+	   lanczos
+	   gauss
+	   tukey
+	   dolph
+	   cauchy
+	   parzen
+	   poisson
+	   bohman
+	   kaiser
+
+	   Default value is "hann".
+
+       orientation
+	   Set orientation of time vs frequency axis. Can be "vertical" or
+	   "horizontal". Default is "vertical".
+
+       gain
+	   Set scale gain for calculating intensity color values.  Default
+	   value is 1.
+
+       legend
+	   Draw time and frequency axes and legends. Default is enabled.
+
+       rotation
+	   Set color rotation, must be in [-1.0, 1.0] range.  Default value is
+	   0.
+
+       start
+	   Set start frequency from which to display spectrogram. Default is
+	   0.
+
+       stop
+	   Set stop frequency to which to display spectrogram. Default is 0.
+
+       drange
+	   Set dynamic range used to calculate intensity color values. Default
+	   is 120 dBFS.  Allowed range is from 10 to 200.
+
+       limit
+	   Set upper limit of input audio samples volume in dBFS. Default is 0
+	   dBFS.  Allowed range is from -100 to 100.
+
+       opacity
+	   Set opacity strength when using pixel format output with alpha
+	   component.
+
+       Examples
+
+       o   Extract an audio spectrogram of a whole audio track in a 1024x1024
+	   picture using ffmpeg:
+
+		   ffmpeg -i audio.flac -lavfi showspectrumpic=s=1024x1024 spectrogram.png
+
+   showvolume
+       Convert input audio volume to a video output.
+
+       The filter accepts the following options:
+
+       rate, r
+	   Set video rate.
+
+       b   Set border width, allowed range is [0, 5]. Default is 1.
+
+       w   Set channel width, allowed range is [80, 8192]. Default is 400.
+
+       h   Set channel height, allowed range is [1, 900]. Default is 20.
+
+       f   Set fade, allowed range is [0, 1]. Default is 0.95.
+
+       c   Set volume color expression.
+
+	   The expression can use the following variables:
+
+	   VOLUME
+	       Current max volume of channel in dB.
+
+	   PEAK
+	       Current peak.
+
+	   CHANNEL
+	       Current channel number, starting from 0.
+
+       t   If set, displays channel names. Default is enabled.
+
+       v   If set, displays volume values. Default is enabled.
+
+       o   Set orientation, can be horizontal: "h" or vertical: "v", default
+	   is "h".
+
+       s   Set step size, allowed range is [0, 5]. Default is 0, which means
+	   step is disabled.
+
+       p   Set background opacity, allowed range is [0, 1]. Default is 0.
+
+       m   Set metering mode, can be peak: "p" or rms: "r", default is "p".
+
+       ds  Set display scale, can be linear: "lin" or log: "log", default is
+	   "lin".
+
+       dm  In second.  If set to > 0., display a line for the max level in the
+	   previous seconds.  default is disabled: 0.
+
+       dmc The color of the max line. Use when "dm" option is set to > 0.
+	   default is: "orange"
+
+   showwaves
+       Convert input audio to a video output, representing the samples waves.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "600x240".
+
+       mode
+	   Set display mode.
+
+	   Available values are:
+
+	   point
+	       Draw a point for each sample.
+
+	   line
+	       Draw a vertical line for each sample.
+
+	   p2p Draw a point for each sample and a line between them.
+
+	   cline
+	       Draw a centered vertical line for each sample.
+
+	   Default value is "point".
+
+       n   Set the number of samples which are printed on the same column. A
+	   larger value will decrease the frame rate. Must be a positive
+	   integer. This option can be set only if the value for rate is not
+	   explicitly specified.
+
+       rate, r
+	   Set the (approximate) output frame rate. This is done by setting
+	   the option n. Default value is "25".
+
+       split_channels
+	   Set if channels should be drawn separately or overlap. Default
+	   value is 0.
+
+       colors
+	   Set colors separated by '|' which are going to be used for drawing
+	   of each channel.
+
+       scale
+	   Set amplitude scale.
+
+	   Available values are:
+
+	   lin Linear.
+
+	   log Logarithmic.
+
+	   sqrt
+	       Square root.
+
+	   cbrt
+	       Cubic root.
+
+	   Default is linear.
+
+       draw
+	   Set the draw mode. This is mostly useful to set for high n.
+
+	   Available values are:
+
+	   scale
+	       Scale pixel values for each drawn sample.
+
+	   full
+	       Draw every sample directly.
+
+	   Default value is "scale".
+
+       Examples
+
+       o   Output the input file audio and the corresponding video
+	   representation at the same time:
+
+		   amovie=a.mp3,asplit[out0],showwaves[out1]
+
+       o   Create a synthetic signal and show it with showwaves, forcing a
+	   frame rate of 30 frames per second:
+
+		   aevalsrc=sin(1*2*PI*t)*sin(880*2*PI*t):cos(2*PI*200*t),asplit[out0],showwaves=r=30[out1]
+
+   showwavespic
+       Convert input audio to a single video frame, representing the samples
+       waves.
+
+       The filter accepts the following options:
+
+       size, s
+	   Specify the video size for the output. For the syntax of this
+	   option, check the "Video size" section in the ffmpeg-utils manual.
+	   Default value is "600x240".
+
+       split_channels
+	   Set if channels should be drawn separately or overlap. Default
+	   value is 0.
+
+       colors
+	   Set colors separated by '|' which are going to be used for drawing
+	   of each channel.
+
+       scale
+	   Set amplitude scale.
+
+	   Available values are:
+
+	   lin Linear.
+
+	   log Logarithmic.
+
+	   sqrt
+	       Square root.
+
+	   cbrt
+	       Cubic root.
+
+	   Default is linear.
+
+       draw
+	   Set the draw mode.
+
+	   Available values are:
+
+	   scale
+	       Scale pixel values for each drawn sample.
+
+	   full
+	       Draw every sample directly.
+
+	   Default value is "scale".
+
+       filter
+	   Set the filter mode.
+
+	   Available values are:
+
+	   average
+	       Use average samples values for each drawn sample.
+
+	   peak
+	       Use peak samples values for each drawn sample.
+
+	   Default value is "average".
+
+       Examples
+
+       o   Extract a channel split representation of the wave form of a whole
+	   audio track in a 1024x800 picture using ffmpeg:
+
+		   ffmpeg -i audio.flac -lavfi showwavespic=split_channels=1:s=1024x800 waveform.png
+
+   sidedata, asidedata
+       Delete frame side data, or select frames based on it.
+
+       This filter accepts the following options:
+
+       mode
+	   Set mode of operation of the filter.
+
+	   Can be one of the following:
+
+	   select
+	       Select every frame with side data of "type".
+
+	   delete
+	       Delete side data of "type". If "type" is not set, delete all
+	       side data in the frame.
+
+       type
+	   Set side data type used with all modes. Must be set for "select"
+	   mode. For the list of frame side data types, refer to the
+	   "AVFrameSideDataType" enum in libavutil/frame.h. For example, to
+	   choose "AV_FRAME_DATA_PANSCAN" side data, you must specify
+	   "PANSCAN".
+
+   spectrumsynth
+       Synthesize audio from 2 input video spectrums, first input stream
+       represents magnitude across time and second represents phase across
+       time.  The filter will transform from frequency domain as displayed in
+       videos back to time domain as presented in audio output.
+
+       This filter is primarily created for reversing processed showspectrum
+       filter outputs, but can synthesize sound from other spectrograms too.
+       But in such case results are going to be poor if the phase data is not
+       available, because in such cases phase data need to be recreated,
+       usually it's just recreated from random noise.  For best results use
+       gray only output ("channel" color mode in showspectrum filter) and
+       "log" scale for magnitude video and "lin" scale for phase video. To
+       produce phase, for 2nd video, use "data" option. Inputs videos should
+       generally use "fullframe" slide mode as that saves resources needed for
+       decoding video.
+
+       The filter accepts the following options:
+
+       sample_rate
+	   Specify sample rate of output audio, the sample rate of audio from
+	   which spectrum was generated may differ.
+
+       channels
+	   Set number of channels represented in input video spectrums.
+
+       scale
+	   Set scale which was used when generating magnitude input spectrum.
+	   Can be "lin" or "log". Default is "log".
+
+       slide
+	   Set slide which was used when generating inputs spectrums.  Can be
+	   "replace", "scroll", "fullframe" or "rscroll".  Default is
+	   "fullframe".
+
+       win_func
+	   Set window function used for resynthesis.
+
+       overlap
+	   Set window overlap. In range "[0, 1]". Default is 1, which means
+	   optimal overlap for selected window function will be picked.
+
+       orientation
+	   Set orientation of input videos. Can be "vertical" or "horizontal".
+	   Default is "vertical".
+
+       Examples
+
+       o   First create magnitude and phase videos from audio, assuming audio
+	   is stereo with 44100 sample rate, then resynthesize videos back to
+	   audio with spectrumsynth:
+
+		   ffmpeg -i input.flac -lavfi showspectrum=mode=separate:scale=log:overlap=0.875:color=channel:slide=fullframe:data=magnitude -an -c:v rawvideo magnitude.nut
+		   ffmpeg -i input.flac -lavfi showspectrum=mode=separate:scale=lin:overlap=0.875:color=channel:slide=fullframe:data=phase -an -c:v rawvideo phase.nut
+		   ffmpeg -i magnitude.nut -i phase.nut -lavfi spectrumsynth=channels=2:sample_rate=44100:win_func=hann:overlap=0.875:slide=fullframe output.flac
+
+   split, asplit
+       Split input into several identical outputs.
+
+       "asplit" works with audio input, "split" with video.
+
+       The filter accepts a single parameter which specifies the number of
+       outputs. If unspecified, it defaults to 2.
+
+       Examples
+
+       o   Create two separate outputs from the same input:
+
+		   [in] split [out0][out1]
+
+       o   To create 3 or more outputs, you need to specify the number of
+	   outputs, like in:
+
+		   [in] asplit=3 [out0][out1][out2]
+
+       o   Create two separate outputs from the same input, one cropped and
+	   one padded:
+
+		   [in] split [splitout1][splitout2];
+		   [splitout1] crop=100:100:0:0    [cropout];
+		   [splitout2] pad=200:200:100:100 [padout];
+
+       o   Create 5 copies of the input audio with ffmpeg:
+
+		   ffmpeg -i INPUT -filter_complex asplit=5 OUTPUT
+
+   zmq, azmq
+       Receive commands sent through a libzmq client, and forward them to
+       filters in the filtergraph.
+
+       "zmq" and "azmq" work as a pass-through filters. "zmq" must be inserted
+       between two video filters, "azmq" between two audio filters. Both are
+       capable to send messages to any filter type.
+
+       To enable these filters you need to install the libzmq library and
+       headers and configure FFmpeg with "--enable-libzmq".
+
+       For more information about libzmq see: <http://www.zeromq.org/>
+
+       The "zmq" and "azmq" filters work as a libzmq server, which receives
+       messages sent through a network interface defined by the bind_address
+       (or the abbreviation "b") option.  Default value of this option is
+       tcp://localhost:5555. You may want to alter this value to your needs,
+       but do not forget to escape any ':' signs (see filtergraph escaping).
+
+       The received message must be in the form:
+
+	       <TARGET> <COMMAND> [<ARG>]
+
+       TARGET specifies the target of the command, usually the name of the
+       filter class or a specific filter instance name. The default filter
+       instance name uses the pattern Parsed_<filter_name>_<index>, but you
+       can override this by using the filter_name@id syntax (see Filtergraph
+       syntax).
+
+       COMMAND specifies the name of the command for the target filter.
+
+       ARG is optional and specifies the optional argument list for the given
+       COMMAND.
+
+       Upon reception, the message is processed and the corresponding command
+       is injected into the filtergraph. Depending on the result, the filter
+       will send a reply to the client, adopting the format:
+
+	       <ERROR_CODE> <ERROR_REASON>
+	       <MESSAGE>
+
+       MESSAGE is optional.
+
+       Examples
+
+       Look at tools/zmqsend for an example of a zmq client which can be used
+       to send commands processed by these filters.
+
+       Consider the following filtergraph generated by ffplay.	In this
+       example the last overlay filter has an instance name. All other filters
+       will have default instance names.
+
+	       ffplay -dumpgraph 1 -f lavfi "
+	       color=s=100x100:c=red  [l];
+	       color=s=100x100:c=blue [r];
+	       nullsrc=s=200x100, zmq [bg];
+	       [bg][l]	 overlay     [bg+l];
+	       [bg+l][r] overlay@my=x=100 "
+
+       To change the color of the left side of the video, the following
+       command can be used:
+
+	       echo Parsed_color_0 c yellow | tools/zmqsend
+
+       To change the right side:
+
+	       echo Parsed_color_1 c pink | tools/zmqsend
+
+       To change the position of the right side:
+
+	       echo overlay@my x 150 | tools/zmqsend
+
+MULTIMEDIA SOURCES
+       Below is a description of the currently available multimedia sources.
+
+   amovie
+       This is the same as movie source, except it selects an audio stream by
+       default.
+
+   avsynctest
+       Generate an Audio/Video Sync Test.
+
+       Generated stream periodically shows flash video frame and emits beep in
+       audio.  Useful to inspect A/V sync issues.
+
+       It accepts the following options:
+
+       size, s
+	   Set output video size. Default value is "hd720".
+
+       framerate, fr
+	   Set output video frame rate. Default value is 30.
+
+       samplerate, sr
+	   Set output audio sample rate. Default value is 44100.
+
+       amplitude, a
+	   Set output audio beep amplitude. Default value is 0.7.
+
+       period, p
+	   Set output audio beep period in seconds. Default value is 3.
+
+       delay, dl
+	   Set output video flash delay in number of frames. Default value is
+	   0.
+
+       cycle, c
+	   Enable cycling of video delays, by default is disabled.
+
+       duration, d
+	   Set stream output duration. By default duration is unlimited.
+
+       fg, bg, ag
+	   Set foreground/background/additional color.
+
+       Commands
+
+       This source supports the some above options as commands.
+
+   movie
+       Read audio and/or video stream(s) from a movie container.
+
+       It accepts the following parameters:
+
+       filename
+	   The name of the resource to read (not necessarily a file; it can
+	   also be a device or a stream accessed through some protocol).
+
+       format_name, f
+	   Specifies the format assumed for the movie to read, and can be
+	   either the name of a container or an input device. If not
+	   specified, the format is guessed from movie_name or by probing.
+
+       seek_point, sp
+	   Specifies the seek point in seconds. The frames will be output
+	   starting from this seek point. The parameter is evaluated with
+	   "av_strtod", so the numerical value may be suffixed by an IS
+	   postfix. The default value is "0".
+
+       streams, s
+	   Specifies the streams to read. Several streams can be specified,
+	   separated by "+". The source will then have as many outputs, in the
+	   same order. The syntax is explained in the "Stream specifiers"
+	   section in the ffmpeg manual. Two special names, "dv" and "da"
+	   specify respectively the default (best suited) video and audio
+	   stream. Default is "dv", or "da" if the filter is called as
+	   "amovie".
+
+       stream_index, si
+	   Specifies the index of the video stream to read. If the value is
+	   -1, the most suitable video stream will be automatically selected.
+	   The default value is "-1". Deprecated. If the filter is called
+	   "amovie", it will select audio instead of video.
+
+       loop
+	   Specifies how many times to read the stream in sequence.  If the
+	   value is 0, the stream will be looped infinitely.  Default value is
+	   "1".
+
+	   Note that when the movie is looped the source timestamps are not
+	   changed, so it will generate non monotonically increasing
+	   timestamps.
+
+       discontinuity
+	   Specifies the time difference between frames above which the point
+	   is considered a timestamp discontinuity which is removed by
+	   adjusting the later timestamps.
+
+       dec_threads
+	   Specifies the number of threads for decoding
+
+       format_opts
+	   Specify format options for the opened file. Format options can be
+	   specified as a list of key=value pairs separated by ':'. The
+	   following example shows how to add protocol_whitelist and
+	   protocol_blacklist options:
+
+		   ffplay -f lavfi
+		   "movie=filename='1.sdp':format_opts='protocol_whitelist=file,rtp,udp\:protocol_blacklist=http'"
+
+       It allows overlaying a second video on top of the main input of a
+       filtergraph, as shown in this graph:
+
+	       input -----------> deltapts0 --> overlay --> output
+						   ^
+						   |
+	       movie --> scale--> deltapts1 -------+
+
+       Examples
+
+       o   Skip 3.2 seconds from the start of the AVI file in.avi, and overlay
+	   it on top of the input labelled "in":
+
+		   movie=in.avi:seek_point=3.2, scale=180:-1, setpts=PTS-STARTPTS [over];
+		   [in] setpts=PTS-STARTPTS [main];
+		   [main][over] overlay=16:16 [out]
+
+       o   Read from a video4linux2 device, and overlay it on top of the input
+	   labelled "in":
+
+		   movie=/dev/video0:f=video4linux2, scale=180:-1, setpts=PTS-STARTPTS [over];
+		   [in] setpts=PTS-STARTPTS [main];
+		   [main][over] overlay=16:16 [out]
+
+       o   Read the first video stream and the audio stream with id 0x81 from
+	   dvd.vob; the video is connected to the pad named "video" and the
+	   audio is connected to the pad named "audio":
+
+		   movie=dvd.vob:s=v:0+#0x81 [video] [audio]
+
+       Commands
+
+       Both movie and amovie support the following commands:
+
+       seek
+	   Perform seek using "av_seek_frame".	The syntax is: seek
+	   stream_index|timestamp|flags
+
+	   o   stream_index: If stream_index is -1, a default stream is
+	       selected, and timestamp is automatically converted from
+	       AV_TIME_BASE units to the stream specific time_base.
+
+	   o   timestamp: Timestamp in AVStream.time_base units or, if no
+	       stream is specified, in AV_TIME_BASE units.
+
+	   o   flags: Flags which select direction and seeking mode.
+
+       get_duration
+	   Get movie duration in AV_TIME_BASE units.
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libavfilter(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							     FFMPEG-FILTERS(1)
diff --git a/ffmpeg/manpages/ffmpeg-formats.txt b/ffmpeg/manpages/ffmpeg-formats.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c5f705501e64cc1a151f6df3e1fc7a1fdf01f194
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-formats.txt
@@ -0,0 +1,4973 @@
+FFMPEG-FORMATS(1)					     FFMPEG-FORMATS(1)
+
+NAME
+       ffmpeg-formats - FFmpeg formats
+
+DESCRIPTION
+       This document describes the supported formats (muxers and demuxers)
+       provided by the libavformat library.
+
+FORMAT OPTIONS
+       The libavformat library provides some generic global options, which can
+       be set on all the muxers and demuxers. In addition each muxer or
+       demuxer may support so-called private options, which are specific for
+       that component.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the "AVFormatContext" options or
+       using the libavutil/opt.h API for programmatic use.
+
+       The list of supported options follows:
+
+       avioflags flags (input/output)
+	   Possible values:
+
+	   direct
+	       Reduce buffering.
+
+       probesize integer (input)
+	   Set probing size in bytes, i.e. the size of the data to analyze to
+	   get stream information. A higher value will enable detecting more
+	   information in case it is dispersed into the stream, but will
+	   increase latency. Must be an integer not lesser than 32. It is
+	   5000000 by default.
+
+       max_probe_packets integer (input)
+	   Set the maximum number of buffered packets when probing a codec.
+	   Default is 2500 packets.
+
+       packetsize integer (output)
+	   Set packet size.
+
+       fflags flags
+	   Set format flags. Some are implemented for a limited number of
+	   formats.
+
+	   Possible values for input files:
+
+	   discardcorrupt
+	       Discard corrupted packets.
+
+	   fastseek
+	       Enable fast, but inaccurate seeks for some formats.
+
+	   genpts
+	       Generate missing PTS if DTS is present.
+
+	   igndts
+	       Ignore DTS if PTS is also set. In case the PTS is set, the DTS
+	       value is set to NOPTS. This is ignored when the "nofillin" flag
+	       is set.
+
+	   ignidx
+	       Ignore index.
+
+	   nobuffer
+	       Reduce the latency introduced by buffering during initial input
+	       streams analysis.
+
+	   nofillin
+	       Do not fill in missing values in packet fields that can be
+	       exactly calculated.
+
+	   noparse
+	       Disable AVParsers, this needs "+nofillin" too.
+
+	   sortdts
+	       Try to interleave output packets by DTS. At present, available
+	       only for AVIs with an index.
+
+	   Possible values for output files:
+
+	   autobsf
+	       Automatically apply bitstream filters as required by the output
+	       format. Enabled by default.
+
+	   bitexact
+	       Only write platform-, build- and time-independent data.	This
+	       ensures that file and data checksums are reproducible and match
+	       between platforms. Its primary use is for regression testing.
+
+	   flush_packets
+	       Write out packets immediately.
+
+	   shortest
+	       Stop muxing at the end of the shortest stream.  It may be
+	       needed to increase max_interleave_delta to avoid flushing the
+	       longer streams before EOF.
+
+       seek2any integer (input)
+	   Allow seeking to non-keyframes on demuxer level when supported if
+	   set to 1.  Default is 0.
+
+       analyzeduration integer (input)
+	   Specify how many microseconds are analyzed to probe the input. A
+	   higher value will enable detecting more accurate information, but
+	   will increase latency. It defaults to 5,000,000 microseconds = 5
+	   seconds.
+
+       cryptokey hexadecimal string (input)
+	   Set decryption key.
+
+       indexmem integer (input)
+	   Set max memory used for timestamp index (per stream).
+
+       rtbufsize integer (input)
+	   Set max memory used for buffering real-time frames.
+
+       fdebug flags (input/output)
+	   Print specific debug info.
+
+	   Possible values:
+
+	   ts
+       max_delay integer (input/output)
+	   Set maximum muxing or demuxing delay in microseconds.
+
+       fpsprobesize integer (input)
+	   Set number of frames used to probe fps.
+
+       audio_preload integer (output)
+	   Set microseconds by which audio packets should be interleaved
+	   earlier.
+
+       chunk_duration integer (output)
+	   Set microseconds for each chunk.
+
+       chunk_size integer (output)
+	   Set size in bytes for each chunk.
+
+       err_detect, f_err_detect flags (input)
+	   Set error detection flags. "f_err_detect" is deprecated and should
+	   be used only via the ffmpeg tool.
+
+	   Possible values:
+
+	   crccheck
+	       Verify embedded CRCs.
+
+	   bitstream
+	       Detect bitstream specification deviations.
+
+	   buffer
+	       Detect improper bitstream length.
+
+	   explode
+	       Abort decoding on minor error detection.
+
+	   careful
+	       Consider things that violate the spec and have not been seen in
+	       the wild as errors.
+
+	   compliant
+	       Consider all spec non compliancies as errors.
+
+	   aggressive
+	       Consider things that a sane encoder should not do as an error.
+
+       max_interleave_delta integer (output)
+	   Set maximum buffering duration for interleaving. The duration is
+	   expressed in microseconds, and defaults to 10000000 (10 seconds).
+
+	   To ensure all the streams are interleaved correctly, libavformat
+	   will wait until it has at least one packet for each stream before
+	   actually writing any packets to the output file. When some streams
+	   are "sparse" (i.e. there are large gaps between successive
+	   packets), this can result in excessive buffering.
+
+	   This field specifies the maximum difference between the timestamps
+	   of the first and the last packet in the muxing queue, above which
+	   libavformat will output a packet regardless of whether it has
+	   queued a packet for all the streams.
+
+	   If set to 0, libavformat will continue buffering packets until it
+	   has a packet for each stream, regardless of the maximum timestamp
+	   difference between the buffered packets.
+
+       use_wallclock_as_timestamps integer (input)
+	   Use wallclock as timestamps if set to 1. Default is 0.
+
+       avoid_negative_ts integer (output)
+	   Possible values:
+
+	   make_non_negative
+	       Shift timestamps to make them non-negative.  Also note that
+	       this affects only leading negative timestamps, and not non-
+	       monotonic negative timestamps.
+
+	   make_zero
+	       Shift timestamps so that the first timestamp is 0.
+
+	   auto (default)
+	       Enables shifting when required by the target format.
+
+	   disabled
+	       Disables shifting of timestamp.
+
+	   When shifting is enabled, all output timestamps are shifted by the
+	   same amount. Audio, video, and subtitles desynching and relative
+	   timestamp differences are preserved compared to how they would have
+	   been without shifting.
+
+       skip_initial_bytes integer (input)
+	   Set number of bytes to skip before reading header and frames if set
+	   to 1.  Default is 0.
+
+       correct_ts_overflow integer (input)
+	   Correct single timestamp overflows if set to 1. Default is 1.
+
+       flush_packets integer (output)
+	   Flush the underlying I/O stream after each packet. Default is -1
+	   (auto), which means that the underlying protocol will decide, 1
+	   enables it, and has the effect of reducing the latency, 0 disables
+	   it and may increase IO throughput in some cases.
+
+       output_ts_offset offset (output)
+	   Set the output time offset.
+
+	   offset must be a time duration specification, see the Time duration
+	   section in the ffmpeg-utils(1) manual.
+
+	   The offset is added by the muxer to the output timestamps.
+
+	   Specifying a positive offset means that the corresponding streams
+	   are delayed bt the time duration specified in offset. Default value
+	   is 0 (meaning that no offset is applied).
+
+       format_whitelist list (input)
+	   "," separated list of allowed demuxers. By default all are allowed.
+
+       dump_separator string (input)
+	   Separator used to separate the fields printed on the command line
+	   about the Stream parameters.  For example, to separate the fields
+	   with newlines and indentation:
+
+		   ffprobe -dump_separator "
+					     "	-i ~/videos/matrixbench_mpeg2.mpg
+
+       max_streams integer (input)
+	   Specifies the maximum number of streams. This can be used to reject
+	   files that would require too many resources due to a large number
+	   of streams.
+
+       skip_estimate_duration_from_pts bool (input)
+	   Skip estimation of input duration when calculated using PTS.  At
+	   present, applicable for MPEG-PS and MPEG-TS.
+
+       strict, f_strict integer (input/output)
+	   Specify how strictly to follow the standards. "f_strict" is
+	   deprecated and should be used only via the ffmpeg tool.
+
+	   Possible values:
+
+	   very
+	       strictly conform to an older more strict version of the spec or
+	       reference software
+
+	   strict
+	       strictly conform to all the things in the spec no matter what
+	       consequences
+
+	   normal
+	   unofficial
+	       allow unofficial extensions
+
+	   experimental
+	       allow non standardized experimental things, experimental
+	       (unfinished/work in progress/not well tested) decoders and
+	       encoders.  Note: experimental decoders can pose a security
+	       risk, do not use this for decoding untrusted input.
+
+   Format stream specifiers
+       Format stream specifiers allow selection of one or more streams that
+       match specific properties.
+
+       The exact semantics of stream specifiers is defined by the
+       "avformat_match_stream_specifier()" function declared in the
+       libavformat/avformat.h header and documented in the Stream specifiers
+       section in the ffmpeg(1) manual.
+
+DEMUXERS
+       Demuxers are configured elements in FFmpeg that can read the multimedia
+       streams from a particular type of file.
+
+       When you configure your FFmpeg build, all the supported demuxers are
+       enabled by default. You can list all available ones using the configure
+       option "--list-demuxers".
+
+       You can disable all the demuxers using the configure option
+       "--disable-demuxers", and selectively enable a single demuxer with the
+       option "--enable-demuxer=DEMUXER", or disable it with the option
+       "--disable-demuxer=DEMUXER".
+
+       The option "-demuxers" of the ff* tools will display the list of
+       enabled demuxers. Use "-formats" to view a combined list of enabled
+       demuxers and muxers.
+
+       The description of some of the currently available demuxers follows.
+
+   aa
+       Audible Format 2, 3, and 4 demuxer.
+
+       This demuxer is used to demux Audible Format 2, 3, and 4 (.aa) files.
+
+   aac
+       Raw Audio Data Transport Stream AAC demuxer.
+
+       This demuxer is used to demux an ADTS input containing a single AAC
+       stream alongwith any ID3v1/2 or APE tags in it.
+
+   apng
+       Animated Portable Network Graphics demuxer.
+
+       This demuxer is used to demux APNG files.  All headers, but the PNG
+       signature, up to (but not including) the first fcTL chunk are
+       transmitted as extradata.  Frames are then split as being all the
+       chunks between two fcTL ones, or between the last fcTL and IEND chunks.
+
+       -ignore_loop bool
+	   Ignore the loop variable in the file if set. Default is enabled.
+
+       -max_fps int
+	   Maximum framerate in frames per second. Default of 0 imposes no
+	   limit.
+
+       -default_fps int
+	   Default framerate in frames per second when none is specified in
+	   the file (0 meaning as fast as possible). Default is 15.
+
+   asf
+       Advanced Systems Format demuxer.
+
+       This demuxer is used to demux ASF files and MMS network streams.
+
+       -no_resync_search bool
+	   Do not try to resynchronize by looking for a certain optional start
+	   code.
+
+   concat
+       Virtual concatenation script demuxer.
+
+       This demuxer reads a list of files and other directives from a text
+       file and demuxes them one after the other, as if all their packets had
+       been muxed together.
+
+       The timestamps in the files are adjusted so that the first file starts
+       at 0 and each next file starts where the previous one finishes. Note
+       that it is done globally and may cause gaps if all streams do not have
+       exactly the same length.
+
+       All files must have the same streams (same codecs, same time base,
+       etc.).
+
+       The duration of each file is used to adjust the timestamps of the next
+       file: if the duration is incorrect (because it was computed using the
+       bit-rate or because the file is truncated, for example), it can cause
+       artifacts. The "duration" directive can be used to override the
+       duration stored in each file.
+
+       Syntax
+
+       The script is a text file in extended-ASCII, with one directive per
+       line.  Empty lines, leading spaces and lines starting with '#' are
+       ignored. The following directive is recognized:
+
+       "file path"
+	   Path to a file to read; special characters and spaces must be
+	   escaped with backslash or single quotes.
+
+	   All subsequent file-related directives apply to that file.
+
+       "ffconcat version 1.0"
+	   Identify the script type and version.
+
+	   To make FFmpeg recognize the format automatically, this directive
+	   must appear exactly as is (no extra space or byte-order-mark) on
+	   the very first line of the script.
+
+       "duration dur"
+	   Duration of the file. This information can be specified from the
+	   file; specifying it here may be more efficient or help if the
+	   information from the file is not available or accurate.
+
+	   If the duration is set for all files, then it is possible to seek
+	   in the whole concatenated video.
+
+       "inpoint timestamp"
+	   In point of the file. When the demuxer opens the file it instantly
+	   seeks to the specified timestamp. Seeking is done so that all
+	   streams can be presented successfully at In point.
+
+	   This directive works best with intra frame codecs, because for non-
+	   intra frame ones you will usually get extra packets before the
+	   actual In point and the decoded content will most likely contain
+	   frames before In point too.
+
+	   For each file, packets before the file In point will have
+	   timestamps less than the calculated start timestamp of the file
+	   (negative in case of the first file), and the duration of the files
+	   (if not specified by the "duration" directive) will be reduced
+	   based on their specified In point.
+
+	   Because of potential packets before the specified In point, packet
+	   timestamps may overlap between two concatenated files.
+
+       "outpoint timestamp"
+	   Out point of the file. When the demuxer reaches the specified
+	   decoding timestamp in any of the streams, it handles it as an end
+	   of file condition and skips the current and all the remaining
+	   packets from all streams.
+
+	   Out point is exclusive, which means that the demuxer will not
+	   output packets with a decoding timestamp greater or equal to Out
+	   point.
+
+	   This directive works best with intra frame codecs and formats where
+	   all streams are tightly interleaved. For non-intra frame codecs you
+	   will usually get additional packets with presentation timestamp
+	   after Out point therefore the decoded content will most likely
+	   contain frames after Out point too. If your streams are not tightly
+	   interleaved you may not get all the packets from all streams before
+	   Out point and you may only will be able to decode the earliest
+	   stream until Out point.
+
+	   The duration of the files (if not specified by the "duration"
+	   directive) will be reduced based on their specified Out point.
+
+       "file_packet_metadata key=value"
+	   Metadata of the packets of the file. The specified metadata will be
+	   set for each file packet. You can specify this directive multiple
+	   times to add multiple metadata entries.  This directive is
+	   deprecated, use "file_packet_meta" instead.
+
+       "file_packet_meta key value"
+	   Metadata of the packets of the file. The specified metadata will be
+	   set for each file packet. You can specify this directive multiple
+	   times to add multiple metadata entries.
+
+       "option key value"
+	   Option to access, open and probe the file.  Can be present multiple
+	   times.
+
+       "stream"
+	   Introduce a stream in the virtual file.  All subsequent stream-
+	   related directives apply to the last introduced stream.  Some
+	   streams properties must be set in order to allow identifying the
+	   matching streams in the subfiles.  If no streams are defined in the
+	   script, the streams from the first file are copied.
+
+       "exact_stream_id id"
+	   Set the id of the stream.  If this directive is given, the string
+	   with the corresponding id in the subfiles will be used.  This is
+	   especially useful for MPEG-PS (VOB) files, where the order of the
+	   streams is not reliable.
+
+       "stream_meta key value"
+	   Metadata for the stream.  Can be present multiple times.
+
+       "stream_codec value"
+	   Codec for the stream.
+
+       "stream_extradata hex_string"
+	   Extradata for the string, encoded in hexadecimal.
+
+       "chapter id start end"
+	   Add a chapter. id is an unique identifier, possibly small and
+	   consecutive.
+
+       Options
+
+       This demuxer accepts the following option:
+
+       safe
+	   If set to 1, reject unsafe file paths and directives.  A file path
+	   is considered safe if it does not contain a protocol specification
+	   and is relative and all components only contain characters from the
+	   portable character set (letters, digits, period, underscore and
+	   hyphen) and have no period at the beginning of a component.
+
+	   If set to 0, any file name is accepted.
+
+	   The default is 1.
+
+       auto_convert
+	   If set to 1, try to perform automatic conversions on packet data to
+	   make the streams concatenable.  The default is 1.
+
+	   Currently, the only conversion is adding the h264_mp4toannexb
+	   bitstream filter to H.264 streams in MP4 format. This is necessary
+	   in particular if there are resolution changes.
+
+       segment_time_metadata
+	   If set to 1, every packet will contain the lavf.concat.start_time
+	   and the lavf.concat.duration packet metadata values which are the
+	   start_time and the duration of the respective file segments in the
+	   concatenated output expressed in microseconds. The duration
+	   metadata is only set if it is known based on the concat file.  The
+	   default is 0.
+
+       Examples
+
+       o   Use absolute filenames and include some comments:
+
+		   # my first filename
+		   file /mnt/share/file-1.wav
+		   # my second filename including whitespace
+		   file '/mnt/share/file 2.wav'
+		   # my third filename including whitespace plus single quote
+		   file '/mnt/share/file 3'\''.wav'
+
+       o   Allow for input format auto-probing, use safe filenames and set the
+	   duration of the first file:
+
+		   ffconcat version 1.0
+
+		   file file-1.wav
+		   duration 20.0
+
+		   file subdir/file-2.wav
+
+   dash
+       Dynamic Adaptive Streaming over HTTP demuxer.
+
+       This demuxer presents all AVStreams found in the manifest.  By setting
+       the discard flags on AVStreams the caller can decide which streams to
+       actually receive.  Each stream mirrors the "id" and "bandwidth"
+       properties from the "<Representation>" as metadata keys named "id" and
+       "variant_bitrate" respectively.
+
+       Options
+
+       This demuxer accepts the following option:
+
+       cenc_decryption_key
+	   16-byte key, in hex, to decrypt files encrypted using ISO Common
+	   Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+
+   dvdvideo
+       DVD-Video demuxer, powered by libdvdnav and libdvdread.
+
+       Can directly ingest DVD titles, specifically sequential PGCs, into a
+       conversion pipeline. Menu assets, such as background video or audio,
+       can also be demuxed given the menu's coordinates (at best effort).
+       Seeking is not supported at this time.
+
+       Block devices (DVD drives), ISO files, and directory structures are
+       accepted.  Activate with "-f dvdvideo" in front of one of these inputs.
+
+       This demuxer does NOT have decryption code of any kind. You are on your
+       own working with encrypted DVDs, and should not expect support on the
+       matter.
+
+       Underlying playback is handled by libdvdnav, and structure parsing by
+       libdvdread.  FFmpeg must be built with GPL library support available as
+       well as the configure switches "--enable-libdvdnav" and
+       "--enable-libdvdread".
+
+       You will need to provide either the desired "title number" or exact
+       PGC/PG coordinates.  Many open-source DVD players and tools can aid in
+       providing this information.  If not specified, the demuxer will default
+       to title 1 which works for many discs.  However, due to the flexibility
+       of the format, it is recommended to check manually.  There are many
+       discs that are authored strangely or with invalid headers.
+
+       If the input is a real DVD drive, please note that there are some
+       drives which may silently fail on reading bad sectors from the disc,
+       returning random bits instead which is effectively corrupt data. This
+       is especially prominent on aging or rotting discs.  A second pass and
+       integrity checks would be needed to detect the corruption.  This is not
+       an FFmpeg issue.
+
+       Background
+
+       DVD-Video is not a directly accessible, linear container format in the
+       traditional sense. Instead, it allows for complex and programmatic
+       playback of carefully muxed MPEG-PS streams that are stored in
+       headerless VOB files.  To the end-user, these streams are known simply
+       as "titles", but the actual logical playback sequence is defined by one
+       or more "PGCs", or Program Group Chains, within the title. The PGC is
+       in turn comprised of multiple "PGs", or Programs", which are the actual
+       video segments (and for a typical video feature, sequentially ordered).
+       The PGC structure, along with stream layout and metadata, are stored in
+       IFO files that need to be parsed. PGCs can be thought of as playlists
+       in easier terms.
+
+       An actual DVD player relies on user GUI interaction via menus and an
+       internal VM to drive the direction of demuxing. Generally, the user
+       would either navigate (via menus) or automatically be redirected to the
+       PGC of their choice. During this process and the subsequent playback,
+       the DVD player's internal VM also maintains a state and executes
+       instructions that can create jumps to different sectors during
+       playback.  This is why libdvdnav is involved, as a linear read of the
+       MPEG-PS blobs on the disc (VOBs) is not enough to produce the right
+       sequence in many cases.
+
+       There are many other DVD structures (a long subject) that will not be
+       discussed here.	NAV packets, in particular, are handled by this
+       demuxer to build accurate timing but not emitted as a stream. For a
+       good high-level understanding, refer to:
+       <https://code.videolan.org/videolan/libdvdnav/-/blob/master/doc/dvd_structures>
+
+       Options
+
+       This demuxer accepts the following options:
+
+       title int
+	   The title number to play. Must be set if pgc and pg are not set.
+	   Not applicable to menus.  Default is 0 (auto), which currently only
+	   selects the first available title (title 1) and notifies the user
+	   about the implications.
+
+       chapter_start int
+	   The chapter, or PTT (part-of-title), number to start at. Not
+	   applicable to menus.  Default is 1.
+
+       chapter_end int
+	   The chapter, or PTT (part-of-title), number to end at. Not
+	   applicable to menus.  Default is 0, which is a special value to
+	   signal end at the last possible chapter.
+
+       angle int
+	   The video angle number, referring to what is essentially an
+	   additional video stream that is composed from alternate frames
+	   interleaved in the VOBs.  Not applicable to menus.  Default is 1.
+
+       region int
+	   The region code to use for playback. Some discs may use this to
+	   default playback at a particular angle in different regions. This
+	   option will not affect the region code of a real DVD drive, if used
+	   as an input. Not applicable to menus.  Default is 0, "world".
+
+       menu bool
+	   Demux menu assets instead of navigating a title. Requires exact
+	   coordinates of the menu (menu_lu, menu_vts, pgc, pg).  Default is
+	   false.
+
+       menu_lu int
+	   The menu language to demux. In DVD, menus are grouped by language.
+	   Default is 0, the first language unit.
+
+       menu_vts int
+	   The VTS where the menu lives, or 0 if it is a VMG menu (root-
+	   level).  Default is 0, VMG menu.
+
+       pgc int
+	   The entry PGC to start playback, in conjunction with pg.
+	   Alternative to setting title.  Chapter markers are not supported at
+	   this time.  Must be explicitly set for menus.  Default is 0,
+	   automatically resolve from value of title.
+
+       pg int
+	   The entry PG to start playback, in conjunction with pgc.
+	   Alternative to setting title.  Chapter markers are not supported at
+	   this time.  Default is 0, automatically resolve from value of
+	   title, or start from the beginning (PG 1) of the menu.
+
+       preindex bool
+	   Enable this to have accurate chapter (PTT) markers and duration
+	   measurement, which requires a slow second pass read in order to
+	   index the chapter marker timestamps from NAV packets. This is non-
+	   ideal extra work for real optical drives.  It is recommended and
+	   faster to use this option with a backup of the DVD structure stored
+	   on a hard drive. Not compatible with pgc and pg.  Not applicable to
+	   menus.  Default is 0, false.
+
+       trim bool
+	   Skip padding cells (i.e. cells shorter than 1 second) from the
+	   beginning.  There exist many discs with filler segments at the
+	   beginning of the PGC, often with junk data intended for controlling
+	   a real DVD player's buffering speed and with no other material data
+	   value.  Not applicable to menus.  Default is 1, true.
+
+       Examples
+
+       o   Open title 3 from a given DVD structure:
+
+		   ffmpeg -f dvdvideo -title 3 -i <path to DVD> ...
+
+       o   Open chapters 3-6 from title 1 from a given DVD structure:
+
+		   ffmpeg -f dvdvideo -chapter_start 3 -chapter_end 6 -title 1 -i <path to DVD> ...
+
+       o   Open only chapter 5 from title 1 from a given DVD structure:
+
+		   ffmpeg -f dvdvideo -chapter_start 5 -chapter_end 5 -title 1 -i <path to DVD> ...
+
+       o   Demux menu with language 1 from VTS 1, PGC 1, starting at PG 1:
+
+		   ffmpeg -f dvdvideo -menu 1 -menu_lu 1 -menu_vts 1 -pgc 1 -pg 1 -i <path to DVD> ...
+
+   ea
+       Electronic Arts Multimedia format demuxer.
+
+       This format is used by various Electronic Arts games.
+
+       Options
+
+       merge_alpha bool
+	   Normally the VP6 alpha channel (if exists) is returned as a
+	   secondary video stream, by setting this option you can make the
+	   demuxer return a single video stream which contains the alpha
+	   channel in addition to the ordinary video.
+
+   imf
+       Interoperable Master Format demuxer.
+
+       This demuxer presents audio and video streams found in an IMF
+       Composition, as specified in
+       <https://doi.org/10.5594/SMPTE.ST2067-2.2020>.
+
+	       ffmpeg [-assetmaps <path of ASSETMAP1>,<path of ASSETMAP2>,...] -i <path of CPL> ...
+
+       If "-assetmaps" is not specified, the demuxer looks for a file called
+       ASSETMAP.xml in the same directory as the CPL.
+
+   flv, live_flv, kux
+       Adobe Flash Video Format demuxer.
+
+       This demuxer is used to demux FLV files and RTMP network streams. In
+       case of live network streams, if you force format, you may use live_flv
+       option instead of flv to survive timestamp discontinuities.  KUX is a
+       flv variant used on the Youku platform.
+
+	       ffmpeg -f flv -i myfile.flv ...
+	       ffmpeg -f live_flv -i rtmp://<any.server>/anything/key ....
+
+       -flv_metadata bool
+	   Allocate the streams according to the onMetaData array content.
+
+       -flv_ignore_prevtag bool
+	   Ignore the size of previous tag value.
+
+       -flv_full_metadata bool
+	   Output all context of the onMetadata.
+
+   gif
+       Animated GIF demuxer.
+
+       It accepts the following options:
+
+       min_delay
+	   Set the minimum valid delay between frames in hundredths of
+	   seconds.  Range is 0 to 6000. Default value is 2.
+
+       max_gif_delay
+	   Set the maximum valid delay between frames in hundredth of seconds.
+	   Range is 0 to 65535. Default value is 65535 (nearly eleven
+	   minutes), the maximum value allowed by the specification.
+
+       default_delay
+	   Set the default delay between frames in hundredths of seconds.
+	   Range is 0 to 6000. Default value is 10.
+
+       ignore_loop
+	   GIF files can contain information to loop a certain number of times
+	   (or infinitely). If ignore_loop is set to 1, then the loop setting
+	   from the input will be ignored and looping will not occur. If set
+	   to 0, then looping will occur and will cycle the number of times
+	   according to the GIF. Default value is 1.
+
+       For example, with the overlay filter, place an infinitely looping GIF
+       over another video:
+
+	       ffmpeg -i input.mp4 -ignore_loop 0 -i input.gif -filter_complex overlay=shortest=1 out.mkv
+
+       Note that in the above example the shortest option for overlay filter
+       is used to end the output video at the length of the shortest input
+       file, which in this case is input.mp4 as the GIF in this example loops
+       infinitely.
+
+   hls
+       HLS demuxer
+
+       Apple HTTP Live Streaming demuxer.
+
+       This demuxer presents all AVStreams from all variant streams.  The id
+       field is set to the bitrate variant index number. By setting the
+       discard flags on AVStreams (by pressing 'a' or 'v' in ffplay), the
+       caller can decide which variant streams to actually receive.  The total
+       bitrate of the variant that the stream belongs to is available in a
+       metadata key named "variant_bitrate".
+
+       It accepts the following options:
+
+       live_start_index
+	   segment index to start live streams at (negative values are from
+	   the end).
+
+       prefer_x_start
+	   prefer to use #EXT-X-START if it's in playlist instead of
+	   live_start_index.
+
+       allowed_extensions
+	   ',' separated list of file extensions that hls is allowed to
+	   access.
+
+       max_reload
+	   Maximum number of times a insufficient list is attempted to be
+	   reloaded.  Default value is 1000.
+
+       m3u8_hold_counters
+	   The maximum number of times to load m3u8 when it refreshes without
+	   new segments.  Default value is 1000.
+
+       http_persistent
+	   Use persistent HTTP connections. Applicable only for HTTP streams.
+	   Enabled by default.
+
+       http_multiple
+	   Use multiple HTTP connections for downloading HTTP segments.
+	   Enabled by default for HTTP/1.1 servers.
+
+       http_seekable
+	   Use HTTP partial requests for downloading HTTP segments.  0 =
+	   disable, 1 = enable, -1 = auto, Default is auto.
+
+       seg_format_options
+	   Set options for the demuxer of media segments using a list of
+	   key=value pairs separated by ":".
+
+       seg_max_retry
+	   Maximum number of times to reload a segment on error, useful when
+	   segment skip on network error is not desired.  Default value is 0.
+
+   image2
+       Image file demuxer.
+
+       This demuxer reads from a list of image files specified by a pattern.
+       The syntax and meaning of the pattern is specified by the option
+       pattern_type.
+
+       The pattern may contain a suffix which is used to automatically
+       determine the format of the images contained in the files.
+
+       The size, the pixel format, and the format of each image must be the
+       same for all the files in the sequence.
+
+       This demuxer accepts the following options:
+
+       framerate
+	   Set the frame rate for the video stream. It defaults to 25.
+
+       loop
+	   If set to 1, loop over the input. Default value is 0.
+
+       pattern_type
+	   Select the pattern type used to interpret the provided filename.
+
+	   pattern_type accepts one of the following values.
+
+	   none
+	       Disable pattern matching, therefore the video will only contain
+	       the specified image. You should use this option if you do not
+	       want to create sequences from multiple images and your
+	       filenames may contain special pattern characters.
+
+	   sequence
+	       Select a sequence pattern type, used to specify a sequence of
+	       files indexed by sequential numbers.
+
+	       A sequence pattern may contain the string "%d" or "%0Nd", which
+	       specifies the position of the characters representing a
+	       sequential number in each filename matched by the pattern. If
+	       the form "%d0Nd" is used, the string representing the number in
+	       each filename is 0-padded and N is the total number of 0-padded
+	       digits representing the number. The literal character '%' can
+	       be specified in the pattern with the string "%%".
+
+	       If the sequence pattern contains "%d" or "%0Nd", the first
+	       filename of the file list specified by the pattern must contain
+	       a number inclusively contained between start_number and
+	       start_number+start_number_range-1, and all the following
+	       numbers must be sequential.
+
+	       For example the pattern "img-%03d.bmp" will match a sequence of
+	       filenames of the form img-001.bmp, img-002.bmp, ...,
+	       img-010.bmp, etc.; the pattern "i%%m%%g-%d.jpg" will match a
+	       sequence of filenames of the form i%m%g-1.jpg, i%m%g-2.jpg,
+	       ..., i%m%g-10.jpg, etc.
+
+	       Note that the pattern must not necessarily contain "%d" or
+	       "%0Nd", for example to convert a single image file img.jpeg you
+	       can employ the command:
+
+		       ffmpeg -i img.jpeg img.png
+
+	   glob
+	       Select a glob wildcard pattern type.
+
+	       The pattern is interpreted like a "glob()" pattern. This is
+	       only selectable if libavformat was compiled with globbing
+	       support.
+
+	   glob_sequence (deprecated, will be removed)
+	       Select a mixed glob wildcard/sequence pattern.
+
+	       If your version of libavformat was compiled with globbing
+	       support, and the provided pattern contains at least one glob
+	       meta character among "%*?[]{}" that is preceded by an unescaped
+	       "%", the pattern is interpreted like a "glob()" pattern,
+	       otherwise it is interpreted like a sequence pattern.
+
+	       All glob special characters "%*?[]{}" must be prefixed with
+	       "%". To escape a literal "%" you shall use "%%".
+
+	       For example the pattern "foo-%*.jpeg" will match all the
+	       filenames prefixed by "foo-" and terminating with ".jpeg", and
+	       "foo-%?%?%?.jpeg" will match all the filenames prefixed with
+	       "foo-", followed by a sequence of three characters, and
+	       terminating with ".jpeg".
+
+	       This pattern type is deprecated in favor of glob and sequence.
+
+	   Default value is glob_sequence.
+
+       pixel_format
+	   Set the pixel format of the images to read. If not specified the
+	   pixel format is guessed from the first image file in the sequence.
+
+       start_number
+	   Set the index of the file matched by the image file pattern to
+	   start to read from. Default value is 0.
+
+       start_number_range
+	   Set the index interval range to check when looking for the first
+	   image file in the sequence, starting from start_number. Default
+	   value is 5.
+
+       ts_from_file
+	   If set to 1, will set frame timestamp to modification time of image
+	   file. Note that monotonity of timestamps is not provided: images go
+	   in the same order as without this option. Default value is 0.  If
+	   set to 2, will set frame timestamp to the modification time of the
+	   image file in nanosecond precision.
+
+       video_size
+	   Set the video size of the images to read. If not specified the
+	   video size is guessed from the first image file in the sequence.
+
+       export_path_metadata
+	   If set to 1, will add two extra fields to the metadata found in
+	   input, making them also available for other filters (see drawtext
+	   filter for examples). Default value is 0. The extra fields are
+	   described below:
+
+	   lavf.image2dec.source_path
+	       Corresponds to the full path to the input file being read.
+
+	   lavf.image2dec.source_basename
+	       Corresponds to the name of the file being read.
+
+       Examples
+
+       o   Use ffmpeg for creating a video from the images in the file
+	   sequence img-001.jpeg, img-002.jpeg, ..., assuming an input frame
+	   rate of 10 frames per second:
+
+		   ffmpeg -framerate 10 -i 'img-%03d.jpeg' out.mkv
+
+       o   As above, but start by reading from a file with index 100 in the
+	   sequence:
+
+		   ffmpeg -framerate 10 -start_number 100 -i 'img-%03d.jpeg' out.mkv
+
+       o   Read images matching the "*.png" glob pattern , that is all the
+	   files terminating with the ".png" suffix:
+
+		   ffmpeg -framerate 10 -pattern_type glob -i "*.png" out.mkv
+
+   libgme
+       The Game Music Emu library is a collection of video game music file
+       emulators.
+
+       See <https://bitbucket.org/mpyne/game-music-emu/overview> for more
+       information.
+
+       It accepts the following options:
+
+       track_index
+	   Set the index of which track to demux. The demuxer can only export
+	   one track.  Track indexes start at 0. Default is to pick the first
+	   track. Number of tracks is exported as tracks metadata entry.
+
+       sample_rate
+	   Set the sampling rate of the exported track. Range is 1000 to
+	   999999. Default is 44100.
+
+       max_size (bytes)
+	   The demuxer buffers the entire file into memory. Adjust this value
+	   to set the maximum buffer size, which in turn, acts as a ceiling
+	   for the size of files that can be read.  Default is 50 MiB.
+
+   libmodplug
+       ModPlug based module demuxer
+
+       See <https://github.com/Konstanty/libmodplug>
+
+       It will export one 2-channel 16-bit 44.1 kHz audio stream.  Optionally,
+       a "pal8" 16-color video stream can be exported with or without printed
+       metadata.
+
+       It accepts the following options:
+
+       noise_reduction
+	   Apply a simple low-pass filter. Can be 1 (on) or 0 (off). Default
+	   is 0.
+
+       reverb_depth
+	   Set amount of reverb. Range 0-100. Default is 0.
+
+       reverb_delay
+	   Set delay in ms, clamped to 40-250 ms. Default is 0.
+
+       bass_amount
+	   Apply bass expansion a.k.a. XBass or megabass. Range is 0 (quiet)
+	   to 100 (loud). Default is 0.
+
+       bass_range
+	   Set cutoff i.e. upper-bound for bass frequencies. Range is 10-100
+	   Hz. Default is 0.
+
+       surround_depth
+	   Apply a Dolby Pro-Logic surround effect. Range is 0 (quiet) to 100
+	   (heavy). Default is 0.
+
+       surround_delay
+	   Set surround delay in ms, clamped to 5-40 ms. Default is 0.
+
+       max_size
+	   The demuxer buffers the entire file into memory. Adjust this value
+	   to set the maximum buffer size, which in turn, acts as a ceiling
+	   for the size of files that can be read. Range is 0 to 100 MiB.  0
+	   removes buffer size limit (not recommended). Default is 5 MiB.
+
+       video_stream_expr
+	   String which is evaluated using the eval API to assign colors to
+	   the generated video stream.	Variables which can be used are "x",
+	   "y", "w", "h", "t", "speed", "tempo", "order", "pattern" and "row".
+
+       video_stream
+	   Generate video stream. Can be 1 (on) or 0 (off). Default is 0.
+
+       video_stream_w
+	   Set video frame width in 'chars' where one char indicates 8 pixels.
+	   Range is 20-512. Default is 30.
+
+       video_stream_h
+	   Set video frame height in 'chars' where one char indicates 8
+	   pixels. Range is 20-512. Default is 30.
+
+       video_stream_ptxt
+	   Print metadata on video stream. Includes "speed", "tempo", "order",
+	   "pattern", "row" and "ts" (time in ms). Can be 1 (on) or 0 (off).
+	   Default is 1.
+
+   libopenmpt
+       libopenmpt based module demuxer
+
+       See <https://lib.openmpt.org/libopenmpt/> for more information.
+
+       Some files have multiple subsongs (tracks) this can be set with the
+       subsong option.
+
+       It accepts the following options:
+
+       subsong
+	   Set the subsong index. This can be either  'all', 'auto', or the
+	   index of the subsong. Subsong indexes start at 0. The default is
+	   'auto'.
+
+	   The default value is to let libopenmpt choose.
+
+       layout
+	   Set the channel layout. Valid values are 1, 2, and 4 channel
+	   layouts.  The default value is STEREO.
+
+       sample_rate
+	   Set the sample rate for libopenmpt to output.  Range is from 1000
+	   to INT_MAX. The value default is 48000.
+
+   mov/mp4/3gp
+       Demuxer for Quicktime File Format & ISO/IEC Base Media File Format
+       (ISO/IEC 14496-12 or MPEG-4 Part 12, ISO/IEC 15444-12 or JPEG 2000 Part
+       12).
+
+       Registered extensions: mov, mp4, m4a, 3gp, 3g2, mj2, psp, m4b, ism,
+       ismv, isma, f4v
+
+       Options
+
+       This demuxer accepts the following options:
+
+       enable_drefs
+	   Enable loading of external tracks, disabled by default.  Enabling
+	   this can theoretically leak information in some use cases.
+
+       use_absolute_path
+	   Allows loading of external tracks via absolute paths, disabled by
+	   default.  Enabling this poses a security risk. It should only be
+	   enabled if the source is known to be non-malicious.
+
+       seek_streams_individually
+	   When seeking, identify the closest point in each stream
+	   individually and demux packets in that stream from identified
+	   point. This can lead to a different sequence of packets compared to
+	   demuxing linearly from the beginning. Default is true.
+
+       ignore_editlist
+	   Ignore any edit list atoms. The demuxer, by default, modifies the
+	   stream index to reflect the timeline described by the edit list.
+	   Default is false.
+
+       advanced_editlist
+	   Modify the stream index to reflect the timeline described by the
+	   edit list. "ignore_editlist" must be set to false for this option
+	   to be effective.  If both "ignore_editlist" and this option are set
+	   to false, then only the start of the stream index is modified to
+	   reflect initial dwell time or starting timestamp described by the
+	   edit list. Default is true.
+
+       ignore_chapters
+	   Don't parse chapters. This includes GoPro 'HiLight' tags/moments.
+	   Note that chapters are only parsed when input is seekable. Default
+	   is false.
+
+       use_mfra_for
+	   For seekable fragmented input, set fragment's starting timestamp
+	   from media fragment random access box, if present.
+
+	   Following options are available:
+
+	   auto
+	       Auto-detect whether to set mfra timestamps as PTS or DTS
+	       (default)
+
+	   dts Set mfra timestamps as DTS
+
+	   pts Set mfra timestamps as PTS
+
+	   0   Don't use mfra box to set timestamps
+
+       use_tfdt
+	   For fragmented input, set fragment's starting timestamp to
+	   "baseMediaDecodeTime" from the "tfdt" box.  Default is enabled,
+	   which will prefer to use the "tfdt" box to set DTS. Disable to use
+	   the "earliest_presentation_time" from the "sidx" box.  In either
+	   case, the timestamp from the "mfra" box will be used if it's
+	   available and "use_mfra_for" is set to pts or dts.
+
+       export_all
+	   Export unrecognized boxes within the udta box as metadata entries.
+	   The first four characters of the box type are set as the key.
+	   Default is false.
+
+       export_xmp
+	   Export entire contents of XMP_ box and uuid box as a string with
+	   key "xmp". Note that if "export_all" is set and this option isn't,
+	   the contents of XMP_ box are still exported but with key "XMP_".
+	   Default is false.
+
+       activation_bytes
+	   4-byte key required to decrypt Audible AAX and AAX+ files. See
+	   Audible AAX subsection below.
+
+       audible_fixed_key
+	   Fixed key used for handling Audible AAX/AAX+ files. It has been
+	   pre-set so should not be necessary to specify.
+
+       decryption_key
+	   16-byte key, in hex, to decrypt files encrypted using ISO Common
+	   Encryption (CENC/AES-128 CTR; ISO/IEC 23001-7).
+
+       max_stts_delta
+	   Very high sample deltas written in a trak's stts box may
+	   occasionally be intended but usually they are written in error or
+	   used to store a negative value for dts correction when treated as
+	   signed 32-bit integers. This option lets the user set an upper
+	   limit, beyond which the delta is clamped to 1. Values greater than
+	   the limit if negative when cast to int32 are used to adjust onward
+	   dts.
+
+	   Unit is the track time scale. Range is 0 to UINT_MAX. Default is
+	   "UINT_MAX - 48000*10" which allows up to a 10 second dts correction
+	   for 48 kHz audio streams while accommodating 99.9% of "uint32"
+	   range.
+
+       interleaved_read
+	   Interleave packets from multiple tracks at demuxer level. For badly
+	   interleaved files, this prevents playback issues caused by large
+	   gaps between packets in different tracks, as MOV/MP4 do not have
+	   packet placement requirements.  However, this can cause excessive
+	   seeking on very badly interleaved files, due to seeking between
+	   tracks, so disabling it may prevent I/O issues, at the expense of
+	   playback.
+
+       Audible AAX
+
+       Audible AAX files are encrypted M4B files, and they can be decrypted by
+       specifying a 4 byte activation secret.
+
+	       ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4
+
+   mpegts
+       MPEG-2 transport stream demuxer.
+
+       This demuxer accepts the following options:
+
+       resync_size
+	   Set size limit for looking up a new synchronization. Default value
+	   is 65536.
+
+       skip_unknown_pmt
+	   Skip PMTs for programs not defined in the PAT. Default value is 0.
+
+       fix_teletext_pts
+	   Override teletext packet PTS and DTS values with the timestamps
+	   calculated from the PCR of the first program which the teletext
+	   stream is part of and is not discarded. Default value is 1, set
+	   this option to 0 if you want your teletext packet PTS and DTS
+	   values untouched.
+
+       ts_packetsize
+	   Output option carrying the raw packet size in bytes.  Show the
+	   detected raw packet size, cannot be set by the user.
+
+       scan_all_pmts
+	   Scan and combine all PMTs. The value is an integer with value from
+	   -1 to 1 (-1 means automatic setting, 1 means enabled, 0 means
+	   disabled). Default value is -1.
+
+       merge_pmt_versions
+	   Re-use existing streams when a PMT's version is updated and
+	   elementary streams move to different PIDs. Default value is 0.
+
+       max_packet_size
+	   Set maximum size, in bytes, of packet emitted by the demuxer.
+	   Payloads above this size are split across multiple packets. Range
+	   is 1 to INT_MAX/2. Default is 204800 bytes.
+
+   mpjpeg
+       MJPEG encapsulated in multi-part MIME demuxer.
+
+       This demuxer allows reading of MJPEG, where each frame is represented
+       as a part of multipart/x-mixed-replace stream.
+
+       strict_mime_boundary
+	   Default implementation applies a relaxed standard to multi-part
+	   MIME boundary detection, to prevent regression with numerous
+	   existing endpoints not generating a proper MIME MJPEG stream.
+	   Turning this option on by setting it to 1 will result in a stricter
+	   check of the boundary value.
+
+   rawvideo
+       Raw video demuxer.
+
+       This demuxer allows one to read raw video data. Since there is no
+       header specifying the assumed video parameters, the user must specify
+       them in order to be able to decode the data correctly.
+
+       This demuxer accepts the following options:
+
+       framerate
+	   Set input video frame rate. Default value is 25.
+
+       pixel_format
+	   Set the input video pixel format. Default value is "yuv420p".
+
+       video_size
+	   Set the input video size. This value must be specified explicitly.
+
+       For example to read a rawvideo file input.raw with ffplay, assuming a
+       pixel format of "rgb24", a video size of "320x240", and a frame rate of
+       10 images per second, use the command:
+
+	       ffplay -f rawvideo -pixel_format rgb24 -video_size 320x240 -framerate 10 input.raw
+
+   sbg
+       SBaGen script demuxer.
+
+       This demuxer reads the script language used by SBaGen
+       <http://uazu.net/sbagen/> to generate binaural beats sessions. A SBG
+       script looks like that:
+
+	       -SE
+	       a: 300-2.5/3 440+4.5/0
+	       b: 300-2.5/0 440+4.5/3
+	       off: -
+	       NOW	== a
+	       +0:07:00 == b
+	       +0:14:00 == a
+	       +0:21:00 == b
+	       +0:30:00    off
+
+       A SBG script can mix absolute and relative timestamps. If the script
+       uses either only absolute timestamps (including the script start time)
+       or only relative ones, then its layout is fixed, and the conversion is
+       straightforward. On the other hand, if the script mixes both kind of
+       timestamps, then the NOW reference for relative timestamps will be
+       taken from the current time of day at the time the script is read, and
+       the script layout will be frozen according to that reference. That
+       means that if the script is directly played, the actual times will
+       match the absolute timestamps up to the sound controller's clock
+       accuracy, but if the user somehow pauses the playback or seeks, all
+       times will be shifted accordingly.
+
+   tedcaptions
+       JSON captions used for <http://www.ted.com/>.
+
+       TED does not provide links to the captions, but they can be guessed
+       from the page. The file tools/bookmarklets.html from the FFmpeg source
+       tree contains a bookmarklet to expose them.
+
+       This demuxer accepts the following option:
+
+       start_time
+	   Set the start time of the TED talk, in milliseconds. The default is
+	   15000 (15s). It is used to sync the captions with the downloadable
+	   videos, because they include a 15s intro.
+
+       Example: convert the captions to a format most players understand:
+
+	       ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt
+
+   vapoursynth
+       Vapoursynth wrapper.
+
+       Due to security concerns, Vapoursynth scripts will not be autodetected
+       so the input format has to be forced. For ff* CLI tools, add "-f
+       vapoursynth" before the input "-i yourscript.vpy".
+
+       This demuxer accepts the following option:
+
+       max_script_size
+	   The demuxer buffers the entire script into memory. Adjust this
+	   value to set the maximum buffer size, which in turn, acts as a
+	   ceiling for the size of scripts that can be read.  Default is 1
+	   MiB.
+
+   w64
+       Sony Wave64 Audio demuxer.
+
+       This demuxer accepts the following options:
+
+       max_size
+	   See the same option for the wav demuxer.
+
+   wav
+       RIFF Wave Audio demuxer.
+
+       This demuxer accepts the following options:
+
+       max_size
+	   Specify the maximum packet size in bytes for the demuxed packets.
+	   By default this is set to 0, which means that a sensible value is
+	   chosen based on the input format.
+
+MUXERS
+       Muxers are configured elements in FFmpeg which allow writing multimedia
+       streams to a particular type of file.
+
+       When you configure your FFmpeg build, all the supported muxers are
+       enabled by default. You can list all available muxers using the
+       configure option "--list-muxers".
+
+       You can disable all the muxers with the configure option
+       "--disable-muxers" and selectively enable / disable single muxers with
+       the options "--enable-muxer=MUXER" / "--disable-muxer=MUXER".
+
+       The option "-muxers" of the ff* tools will display the list of enabled
+       muxers. Use "-formats" to view a combined list of enabled demuxers and
+       muxers.
+
+       A description of some of the currently available muxers follows.
+
+   Raw muxers
+       This section covers raw muxers. They accept a single stream matching
+       the designated codec. They do not store timestamps or metadata. The
+       recognized extension is the same as the muxer name unless indicated
+       otherwise.
+
+       It comprises the following muxers. The media type and the eventual
+       extensions used to automatically selects the muxer from the output
+       extensions are also shown.
+
+       ac3 audio
+	   Dolby Digital, also known as AC-3.
+
+       adx audio
+	   CRI Middleware ADX audio.
+
+	   This muxer will write out the total sample count near the start of
+	   the first packet when the output is seekable and the count can be
+	   stored in 32 bits.
+
+       aptx audio
+	   aptX (Audio Processing Technology for Bluetooth)
+
+       aptx_hd audio (aptxdh)
+	   aptX HD (Audio Processing Technology for Bluetooth) audio
+
+       avs2 video (avs, avs2)
+	   AVS2-P2 (Audio Video Standard - Second generation - Part 2) / IEEE
+	   1857.4 video
+
+       avs3 video (avs3)
+	   AVS3-P2 (Audio Video Standard - Third generation - Part 2) / IEEE
+	   1857.10 video
+
+       cavsvideo video (cavs)
+	   Chinese AVS (Audio Video Standard - First generation)
+
+       codec2raw audio
+	   Codec 2 audio.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f codec2raw".
+
+       data any
+	   Generic data muxer.
+
+	   This muxer accepts a single stream with any codec of any type. The
+	   input stream has to be selected using the "-map" option with the
+	   ffmpeg CLI tool.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f data".
+
+       dfpwm audio (dfpwm)
+	   Raw DFPWM1a (Dynamic Filter Pulse With Modulation) audio muxer.
+
+       dirac video (drc, vc2)
+	   BBC Dirac video.
+
+	   The Dirac Pro codec is a subset and is standardized as SMPTE VC-2.
+
+       dnxhd video (dnxhd, dnxhr)
+	   Avid DNxHD video.
+
+	   It is standardized as SMPTE VC-3. Accepts DNxHR streams.
+
+       dts audio
+	   DTS Coherent Acoustics (DCA) audio
+
+       eac3 audio
+	   Dolby Digital Plus, also known as Enhanced AC-3
+
+       evc video (evc)
+	   MPEG-5 Essential Video Coding (EVC) / EVC / MPEG-5 Part 1 EVC video
+
+       g722 audio
+	   ITU-T G.722 audio
+
+       g723_1 audio (tco, rco)
+	   ITU-T G.723.1 audio
+
+       g726 audio
+	   ITU-T G.726 big-endian ("left-justified") audio.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f g726".
+
+       g726le audio
+	   ITU-T G.726 little-endian ("right-justified") audio.
+
+	   No extension is registered so format name has to be supplied e.g.
+	   with the ffmpeg CLI tool "-f g726le".
+
+       gsm audio
+	   Global System for Mobile Communications audio
+
+       h261 video
+	   ITU-T H.261 video
+
+       h263 video
+	   ITU-T H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
+	   video
+
+       h264 video (h264, 264)
+	   ITU-T H.264 / MPEG-4 Part 10 AVC video. Bitstream shall be
+	   converted to Annex B syntax if it's in length-prefixed mode.
+
+       hevc video (hevc, h265, 265)
+	   ITU-T H.265 / MPEG-H Part 2 HEVC video. Bitstream shall be
+	   converted to Annex B syntax if it's in length-prefixed mode.
+
+       m4v video
+	   MPEG-4 Part 2 video
+
+       mjpeg video (mjpg, mjpeg)
+	   Motion JPEG video
+
+       mlp audio
+	   Meridian Lossless Packing, also known as Packed PCM
+
+       mp2 audio (mp2, m2a, mpa)
+	   MPEG-1 Audio Layer II audio
+
+       mpeg1video video (mpg, mpeg, m1v)
+	   MPEG-1 Part 2 video.
+
+       mpeg2video video (m2v)
+	   ITU-T H.262 / MPEG-2 Part 2 video
+
+       obu video
+	   AV1 low overhead Open Bitstream Units muxer.
+
+	   Temporal delimiter OBUs will be inserted in all temporal units of
+	   the stream.
+
+       rawvideo video (yuv, rgb)
+	   Raw uncompressed video.
+
+       sbc audio (sbc, msbc)
+	   Bluetooth SIG low-complexity subband codec audio
+
+       truehd audio (thd)
+	   Dolby TrueHD audio
+
+       vc1 video
+	   SMPTE 421M / VC-1 video
+
+       Examples
+
+       o   Store raw video frames with the rawvideo muxer using ffmpeg:
+
+		   ffmpeg -f lavfi -i testsrc -t 10 -s hd1080p testsrc.yuv
+
+	   Since the rawvideo muxer do not store the information related to
+	   size and format, this information must be provided when demuxing
+	   the file:
+
+		   ffplay -video_size 1920x1080 -pixel_format rgb24 -f rawvideo testsrc.rgb
+
+   Raw PCM muxers
+       This section covers raw PCM (Pulse-Code Modulation) audio muxers.
+
+       They accept a single stream matching the designated codec. They do not
+       store timestamps or metadata. The recognized extension is the same as
+       the muxer name.
+
+       It comprises the following muxers. The optional additional extension
+       used to automatically select the muxer from the output extension is
+       also shown in parentheses.
+
+       alaw (al)
+	   PCM A-law
+
+       f32be
+	   PCM 32-bit floating-point big-endian
+
+       f32le
+	   PCM 32-bit floating-point little-endian
+
+       f64be
+	   PCM 64-bit floating-point big-endian
+
+       f64le
+	   PCM 64-bit floating-point little-endian
+
+       mulaw (ul)
+	   PCM mu-law
+
+       s16be
+	   PCM signed 16-bit big-endian
+
+       s16le
+	   PCM signed 16-bit little-endian
+
+       s24be
+	   PCM signed 24-bit big-endian
+
+       s24le
+	   PCM signed 24-bit little-endian
+
+       s32be
+	   PCM signed 32-bit big-endian
+
+       s32le
+	   PCM signed 32-bit little-endian
+
+       s8 (sb)
+	   PCM signed 8-bit
+
+       u16be
+	   PCM unsigned 16-bit big-endian
+
+       u16le
+	   PCM unsigned 16-bit little-endian
+
+       u24be
+	   PCM unsigned 24-bit big-endian
+
+       u24le
+	   PCM unsigned 24-bit little-endian
+
+       u32be
+	   PCM unsigned 32-bit big-endian
+
+       u32le
+	   PCM unsigned 32-bit little-endian
+
+       u8 (ub)
+	   PCM unsigned 8-bit
+
+       vidc
+	   PCM Archimedes VIDC
+
+   MPEG-1/MPEG-2 program stream muxers
+       This section covers formats belonging to the MPEG-1 and MPEG-2 Systems
+       family.
+
+       The MPEG-1 Systems format (also known as ISO/IEEC 11172-1 or MPEG-1
+       program stream) has been adopted for the format of media track stored
+       in VCD (Video Compact Disc).
+
+       The MPEG-2 Systems standard (also known as ISO/IEEC 13818-1) covers two
+       containers formats, one known as transport stream and one known as
+       program stream; only the latter is covered here.
+
+       The MPEG-2 program stream format (also known as VOB due to the
+       corresponding file extension) is an extension of MPEG-1 program stream:
+       in addition to support different codecs for the audio and video
+       streams, it also stores subtitles and navigation metadata.  MPEG-2
+       program stream has been adopted for storing media streams in SVCD and
+       DVD storage devices.
+
+       This section comprises the following muxers.
+
+       mpeg (mpg,mpeg)
+	   MPEG-1 Systems / MPEG-1 program stream muxer.
+
+       vcd MPEG-1 Systems / MPEG-1 program stream (VCD) muxer.
+
+	   This muxer can be used to generate tracks in the format accepted by
+	   the VCD (Video Compact Disc) storage devices.
+
+	   It is the same as the mpeg muxer with a few differences.
+
+       vob MPEG-2 program stream (VOB) muxer.
+
+       dvd MPEG-2 program stream (DVD VOB) muxer.
+
+	   This muxer can be used to generate tracks in the format accepted by
+	   the DVD (Digital Versatile Disc) storage devices.
+
+	   This is the same as the vob muxer with a few differences.
+
+       svcd (vob)
+	   MPEG-2 program stream (SVCD VOB) muxer.
+
+	   This muxer can be used to generate tracks in the format accepted by
+	   the SVCD (Super Video Compact Disc) storage devices.
+
+	   This is the same as the vob muxer with a few differences.
+
+       Options
+
+       muxrate rate
+	   Set user-defined mux rate expressed as a number of bits/s. If not
+	   specied the automatically computed mux rate is employed. Default
+	   value is 0.
+
+       preload delay
+	   Set initial demux-decode delay in microseconds. Default value is
+	   500000.
+
+   MOV/MPEG-4/ISOMBFF muxers
+       This section covers formats belonging to the QuickTime / MOV family,
+       including the MPEG-4 Part 14 format and ISO base media file format
+       (ISOBMFF). These formats share a common structure based on the ISO base
+       media file format (ISOBMFF).
+
+       The MOV format was originally developed for use with Apple QuickTime.
+       It was later used as the basis for the MPEG-4 Part 1 (later Part 14)
+       format, also known as ISO/IEC 14496-1. That format was then generalized
+       into ISOBMFF, also named MPEG-4 Part 12 format, ISO/IEC 14496-12, or
+       ISO/IEC 15444-12.
+
+       It comprises the following muxers.
+
+       3gp Third Generation Partnership Project (3GPP) format for 3G UMTS
+	   multimedia services
+
+       3g2 Third Generation Partnership Project 2 (3GP2 or 3GPP2) format for
+	   3G CDMA2000 multimedia services, similar to 3gp with extensions and
+	   limitations
+
+       f4v Adobe Flash Video format
+
+       ipod
+	   MPEG-4 audio file format, as MOV/MP4 but limited to contain only
+	   audio streams, typically played with the Apple ipod device
+
+       ismv
+	   Microsoft IIS (Internet Information Services) Smooth Streaming
+	   Audio/Video (ISMV or ISMA) format. This is based on MPEG-4 Part 14
+	   format with a few incompatible variants, used to stream media files
+	   for the Microsoft IIS server.
+
+       mov QuickTime player format identified by the ".mov" extension
+
+       mp4 MP4 or MPEG-4 Part 14 format
+
+       psp PlayStation Portable MP4/MPEG-4 Part 14 format variant. This is
+	   based on MPEG-4 Part 14 format with a few incompatible variants,
+	   used to play files on PlayStation devices.
+
+       Fragmentation
+
+       The mov, mp4, and ismv muxers support fragmentation. Normally, a
+       MOV/MP4 file has all the metadata about all packets stored in one
+       location.
+
+       This data is usually written at the end of the file, but it can be
+       moved to the start for better playback by adding "+faststart" to the
+       "-movflags", or using the qt-faststart tool).
+
+       A fragmented file consists of a number of fragments, where packets and
+       metadata about these packets are stored together. Writing a fragmented
+       file has the advantage that the file is decodable even if the writing
+       is interrupted (while a normal MOV/MP4 is undecodable if it is not
+       properly finished), and it requires less memory when writing very long
+       files (since writing normal MOV/MP4 files stores info about every
+       single packet in memory until the file is closed). The downside is that
+       it is less compatible with other applications.
+
+       Fragmentation is enabled by setting one of the options that define how
+       to cut the file into fragments:
+
+       frag_duration
+       frag_size
+       min_frag_duration
+       movflags +frag_keyframe
+       movflags +frag_custom
+
+       If more than one condition is specified, fragments are cut when one of
+       the specified conditions is fulfilled. The exception to this is the
+       option min_frag_duration, which has to be fulfilled for any of the
+       other conditions to apply.
+
+       Options
+
+       brand brand_string
+	   Override major brand.
+
+       empty_hdlr_name bool
+	   Enable to skip writing the name inside a "hdlr" box.  Default is
+	   "false".
+
+       encryption_key key
+	   set the media encryption key in hexadecimal format
+
+       encryption_kid kid
+	   set the media encryption key identifier in hexadecimal format
+
+       encryption_scheme scheme
+	   configure the encryption scheme, allowed values are none, and cenc-
+	   aes-ctr
+
+       frag_duration duration
+	   Create fragments that are duration microseconds long.
+
+       frag_interleave	number
+	   Interleave samples within fragments (max number of consecutive
+	   samples, lower is tighter interleaving, but with more overhead. It
+	   is set to 0 by default.
+
+       frag_size size
+	   create fragments that contain up to size bytes of payload data
+
+       iods_audio_profile profile
+	   specify iods number for the audio profile atom (from -1 to 255),
+	   default is "-1"
+
+       iods_video_profile profile
+	   specify iods number for the video profile atom (from -1 to 255),
+	   default is "-1"
+
+       ism_lookahead num_entries
+	   specify number of lookahead entries for ISM files (from 0 to 255),
+	   default is 0
+
+       min_frag_duration duration
+	   do not create fragments that are shorter than duration microseconds
+	   long
+
+       moov_size bytes
+	   Reserves space for the moov atom at the beginning of the file
+	   instead of placing the moov atom at the end. If the space reserved
+	   is insufficient, muxing will fail.
+
+       mov_gamma gamma
+	   specify gamma value for gama atom (as a decimal number from 0 to
+	   10), default is 0.0, must be set together with "+ movflags"
+
+       movflags flags
+	   Set various muxing switches. The following flags can be used:
+
+	   cmaf
+	       write CMAF (Common Media Application Format) compatible
+	       fragmented MP4 output
+
+	   dash
+	       write DASH (Dynamic Adaptive Streaming over HTTP) compatible
+	       fragmented MP4 output
+
+	   default_base_moof
+	       Similarly to the omit_tfhd_offset flag, this flag avoids
+	       writing the absolute base_data_offset field in tfhd atoms, but
+	       does so by using the new default-base-is-moof flag instead.
+	       This flag is new from 14496-12:2012. This may make the
+	       fragments easier to parse in certain circumstances (avoiding
+	       basing track fragment location calculations on the implicit end
+	       of the previous track fragment).
+
+	   delay_moov
+	       delay writing the initial moov until the first fragment is cut,
+	       or until the first fragment flush
+
+	   disable_chpl
+	       Disable Nero chapter markers (chpl atom). Normally, both Nero
+	       chapters and a QuickTime chapter track are written to the file.
+	       With this option set, only the QuickTime chapter track will be
+	       written. Nero chapters can cause failures when the file is
+	       reprocessed with certain tagging programs, like mp3Tag 2.61a
+	       and iTunes 11.3, most likely other versions are affected as
+	       well.
+
+	   faststart
+	       Run a second pass moving the index (moov atom) to the beginning
+	       of the file. This operation can take a while, and will not work
+	       in various situations such as fragmented output, thus it is not
+	       enabled by default.
+
+	   frag_custom
+	       Allow the caller to manually choose when to cut fragments, by
+	       calling "av_write_frame(ctx, NULL)" to write a fragment with
+	       the packets written so far. (This is only useful with other
+	       applications integrating libavformat, not from ffmpeg.)
+
+	   frag_discont
+	       signal that the next fragment is discontinuous from earlier
+	       ones
+
+	   frag_every_frame
+	       fragment at every frame
+
+	   frag_keyframe
+	       start a new fragment at each video keyframe
+
+	   global_sidx
+	       write a global sidx index at the start of the file
+
+	   isml
+	       create a live smooth streaming feed (for pushing to a
+	       publishing point)
+
+	   negative_cts_offsets
+	       Enables utilization of version 1 of the CTTS box, in which the
+	       CTS offsets can be negative. This enables the initial sample to
+	       have DTS/CTS of zero, and reduces the need for edit lists for
+	       some cases such as video tracks with B-frames. Additionally,
+	       eases conformance with the DASH-IF interoperability guidelines.
+
+	       This option is implicitly set when writing ismv (Smooth
+	       Streaming) files.
+
+	   omit_tfhd_offset
+	       Do not write any absolute base_data_offset in tfhd atoms. This
+	       avoids tying fragments to absolute byte positions in the
+	       file/streams.
+
+	   prefer_icc
+	       If writing colr atom prioritise usage of ICC profile if it
+	       exists in stream packet side data.
+
+	   rtphint
+	       add RTP hinting tracks to the output file
+
+	   separate_moof
+	       Write a separate moof (movie fragment) atom for each track.
+	       Normally, packets for all tracks are written in a moof atom
+	       (which is slightly more efficient), but with this option set,
+	       the muxer writes one moof/mdat pair for each track, making it
+	       easier to separate tracks.
+
+	   skip_sidx
+	       Skip writing of sidx atom. When bitrate overhead due to sidx
+	       atom is high, this option could be used for cases where sidx
+	       atom is not mandatory. When the global_sidx flag is enabled,
+	       this option is ignored.
+
+	   skip_trailer
+	       skip writing the mfra/tfra/mfro trailer for fragmented files
+
+	   use_metadata_tags
+	       use mdta atom for metadata
+
+	   write_colr
+	       write colr atom even if the color info is unspecified. This
+	       flag is experimental, may be renamed or changed, do not use
+	       from scripts.
+
+	   write_gama
+	       write deprecated gama atom
+
+       movie_timescale scale
+	   Set the timescale written in the movie header box ("mvhd").	Range
+	   is 1 to INT_MAX. Default is 1000.
+
+       rtpflags flags
+	   Add RTP hinting tracks to the output file.
+
+	   The following flags can be used:
+
+	   h264_mode0
+	       use mode 0 for H.264 in RTP
+
+	   latm
+	       use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC
+
+	   rfc2190
+	       use RFC 2190 packetization instead of RFC 4629 for H.263
+
+	   send_bye
+	       send RTCP BYE packets when finishing
+
+	   skip_rtcp
+	       do not send RTCP sender reports
+
+       skip_iods bool
+	   skip writing iods atom (default value is "true")
+
+       use_editlist bool
+	   use edit list (default value is "auto")
+
+       use_stream_ids_as_track_ids bool
+	   use stream ids as track ids (default value is "false")
+
+       video_track_timescale scale
+	   Set the timescale used for video tracks. Range is 0 to INT_MAX. If
+	   set to 0, the timescale is automatically set based on the native
+	   stream time base. Default is 0.
+
+       write_btrt bool
+	   Force or disable writing bitrate box inside stsd box of a track.
+	   The box contains decoding buffer size (in bytes), maximum bitrate
+	   and average bitrate for the track. The box will be skipped if none
+	   of these values can be computed.  Default is "-1" or "auto", which
+	   will write the box only in MP4 mode.
+
+       write_prft option
+	   Write producer time reference box (PRFT) with a specified time
+	   source for the NTP field in the PRFT box. Set value as wallclock to
+	   specify timesource as wallclock time and pts to specify timesource
+	   as input packets' PTS values.
+
+       write_tmcd bool
+	   Specify "on" to force writing a timecode track, "off" to disable it
+	   and "auto" to write a timecode track only for mov and mp4 output
+	   (default).
+
+	   Setting value to pts is applicable only for a live encoding use
+	   case, where PTS values are set as as wallclock time at the source.
+	   For example, an encoding use case with decklink capture source
+	   where video_pts and audio_pts are set to abs_wallclock.
+
+       Examples
+
+       o   Push Smooth Streaming content in real time to a publishing point on
+	   IIS with the ismv muxer using ffmpeg:
+
+		   ffmpeg -re <<normal input/transcoding options>> -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)
+
+   a64
+       A64 Commodore 64 video muxer.
+
+       This muxer accepts a single "a64_multi" or "a64_multi5" codec video
+       stream.
+
+   ac4
+       Raw AC-4 audio muxer.
+
+       This muxer accepts a single "ac4" audio stream.
+
+       Options
+
+       write_crc bool
+	   when enabled, write a CRC checksum for each packet to the output,
+	   default is "false"
+
+   adts
+       Audio Data Transport Stream muxer.
+
+       It accepts a single AAC stream.
+
+       Options
+
+       write_id3v2 bool
+	   Enable to write ID3v2.4 tags at the start of the stream. Default is
+	   disabled.
+
+       write_apetag bool
+	   Enable to write APE tags at the end of the stream. Default is
+	   disabled.
+
+       write_mpeg2 bool
+	   Enable to set MPEG version bit in the ADTS frame header to 1 which
+	   indicates MPEG-2. Default is 0, which indicates MPEG-4.
+
+   aea
+       MD STUDIO audio muxer.
+
+       This muxer accepts a single ATRAC1 audio stream with either one or two
+       channels and a sample rate of 44100Hz.
+
+       As AEA supports storing the track title, this muxer will also write the
+       title from stream's metadata to the container.
+
+   aiff
+       Audio Interchange File Format muxer.
+
+       Options
+
+       write_id3v2 bool
+	   Enable ID3v2 tags writing when set to 1. Default is 0 (disabled).
+
+       id3v2_version bool
+	   Select ID3v2 version to write. Currently only version 3 and 4 (aka.
+	   ID3v2.3 and ID3v2.4) are supported. The default is version 4.
+
+   alp
+       High Voltage Software's Lego Racers game audio muxer.
+
+       It accepts a single ADPCM_IMA_ALP stream with no more than 2 channels
+       and a sample rate not greater than 44100 Hz.
+
+       Extensions: "tun", "pcm"
+
+       Options
+
+       type type
+	   Set file type.
+
+	   type accepts the following values:
+
+	   tun Set file type as music. Must have a sample rate of 22050 Hz.
+
+	   pcm Set file type as sfx.
+
+	   auto
+	       Set file type as per output file extension. ".pcm" results in
+	       type "pcm" else type "tun" is set. (default)
+
+   amr
+       3GPP AMR (Adaptive Multi-Rate) audio muxer.
+
+       It accepts a single audio stream containing an AMR NB stream.
+
+   amv
+       AMV (Actions Media Video) format muxer.
+
+   apm
+       Ubisoft Rayman 2 APM audio muxer.
+
+       It accepts a single ADPCM IMA APM audio stream.
+
+   apng
+       Animated Portable Network Graphics muxer.
+
+       It accepts a single APNG video stream.
+
+       Options
+
+       final_delay delay
+	   Force a delay expressed in seconds after the last frame of each
+	   repetition. Default value is 0.0.
+
+       plays repetitions
+	   specify how many times to play the content, 0 causes an infinte
+	   loop, with 1 there is no loop
+
+       Examples
+
+       o   Use ffmpeg to generate an APNG output with 2 repetitions, and with
+	   a delay of half a second after the first repetition:
+
+		   ffmpeg -i INPUT -final_delay 0.5 -plays 2 out.apng
+
+   argo_asf
+       Argonaut Games ASF audio muxer.
+
+       It accepts a single ADPCM audio stream.
+
+       Options
+
+       version_major version
+	   override file major version, specified as an integer, default value
+	   is 2
+
+       version_minor version
+	   override file minor version, specified as an integer, default value
+	   is 1
+
+       name name
+	   Embed file name into file, if not specified use the output file
+	   name. The name is truncated to 8 characters.
+
+   argo_cvg
+       Argonaut Games CVG audio muxer.
+
+       It accepts a single one-channel ADPCM 22050Hz audio stream.
+
+       The loop and reverb options set the corresponding flags in the header
+       which can be later retrieved to process the audio stream accordingly.
+
+       Options
+
+       skip_rate_check bool
+	   skip sample rate check (default is "false")
+
+       loop bool
+	   set loop flag (default is "false")
+
+       reverb boolean
+	   set reverb flag (default is "true")
+
+   asf, asf_stream
+       Advanced / Active Systems (or Streaming) Format audio muxer.
+
+       The asf_stream variant should be selected for streaming.
+
+       Note that Windows Media Audio (wma) and Windows Media Video (wmv) use
+       this muxer too.
+
+       Options
+
+       packet_size size
+	   Set the muxer packet size as a number of bytes. By tuning this
+	   setting you may reduce data fragmentation or muxer overhead
+	   depending on your source. Default value is 3200, minimum is 100,
+	   maximum is "64Ki".
+
+   ass
+       ASS/SSA (SubStation Alpha) subtitles muxer.
+
+       It accepts a single ASS subtitles stream.
+
+       Options
+
+       ignore_readorder bool
+	   Write dialogue events immediately, even if they are out-of-order,
+	   default is "false", otherwise they are cached until the expected
+	   time event is found.
+
+   ast
+       AST (Audio Stream) muxer.
+
+       This format is used to play audio on some Nintendo Wii games.
+
+       It accepts a single audio stream.
+
+       The loopstart and loopend options can be used to define a section of
+       the file to loop for players honoring such options.
+
+       Options
+
+       loopstart start
+	   Specify loop start position expressesd in milliseconds, from "-1"
+	   to "INT_MAX", in case "-1" is set then no loop is specified
+	   (default -1) and the loopend value is ignored.
+
+       loopend end
+	   Specify loop end position expressed in milliseconds, from 0 to
+	   "INT_MAX", default is 0, in case 0 is set it assumes the total
+	   stream duration.
+
+   au
+       SUN AU audio muxer.
+
+       It accepts a single audio stream.
+
+   avi
+       Audio Video Interleaved muxer.
+
+       AVI is a proprietary format developed by Microsoft, and later formally
+       specified through the Open DML specification.
+
+       Because of differences in players implementations, it might be required
+       to set some options to make sure that the generated output can be
+       correctly played by the target player.
+
+       Options
+
+       flipped_raw_rgb bool
+	   If set to "true", store positive height for raw RGB bitmaps, which
+	   indicates bitmap is stored bottom-up. Note that this option does
+	   not flip the bitmap which has to be done manually beforehand, e.g.
+	   by using the vflip filter. Default is "false" and indicates bitmap
+	   is stored top down.
+
+       reserve_index_space size
+	   Reserve the specified amount of bytes for the OpenDML master index
+	   of each stream within the file header. By default additional master
+	   indexes are embedded within the data packets if there is no space
+	   left in the first master index and are linked together as a chain
+	   of indexes. This index structure can cause problems for some use
+	   cases, e.g. third-party software strictly relying on the OpenDML
+	   index specification or when file seeking is slow. Reserving enough
+	   index space in the file header avoids these problems.
+
+	   The required index space depends on the output file size and should
+	   be about 16 bytes per gigabyte. When this option is omitted or set
+	   to zero the necessary index space is guessed.
+
+	   Default value is 0.
+
+       write_channel_mask bool
+	   Write the channel layout mask into the audio stream header.
+
+	   This option is enabled by default. Disabling the channel mask can
+	   be useful in specific scenarios, e.g. when merging multiple audio
+	   streams into one for compatibility with software that only supports
+	   a single audio stream in AVI (see the "amerge" section in the
+	   ffmpeg-filters manual).
+
+   avif
+       AV1 (Alliance for Open Media Video codec 1) image format muxer.
+
+       This muxers stores images encoded using the AV1 codec.
+
+       It accepts one or two video streams. In case two video streams are
+       provided, the second one shall contain a single plane storing the alpha
+       mask.
+
+       In case more than one image is provided, the generated output is
+       considered an animated AVIF and the number of loops can be specified
+       with the loop option.
+
+       This is based on the specification by Alliance for Open Media at url
+       <https://aomediacodec.github.io/av1-avif>.
+
+       Options
+
+       loop count
+	   number of times to loop an animated AVIF, 0 specify an infinite
+	   loop, default is 0
+
+       movie_timescale timescale
+	   Set the timescale written in the movie header box ("mvhd").	Range
+	   is 1 to INT_MAX. Default is 1000.
+
+   avm2
+       ShockWave Flash (SWF) / ActionScript Virtual Machine 2 (AVM2) format
+       muxer.
+
+       It accepts one audio stream, one video stream, or both.
+
+   bit
+       G.729 (.bit) file format muxer.
+
+       It accepts a single G.729 audio stream.
+
+   caf
+       Apple CAF (Core Audio Format) muxer.
+
+       It accepts a single audio stream.
+
+   codec2
+       Codec2 audio audio muxer.
+
+       It accepts a single codec2 audio stream.
+
+   chromaprint
+       Chromaprint fingerprinter muxers.
+
+       To enable compilation of this filter you need to configure FFmpeg with
+       "--enable-chromaprint".
+
+       This muxer feeds audio data to the Chromaprint library, which generates
+       a fingerprint for the provided audio data. See:
+       <https://acoustid.org/chromaprint>
+
+       It takes a single signed native-endian 16-bit raw audio stream of at
+       most 2 channels.
+
+       Options
+
+       algorithm version
+	   Select version of algorithm to fingerprint with. Range is 0 to 4.
+	   Version 3 enables silence detection. Default is 1.
+
+       fp_format format
+	   Format to output the fingerprint as. Accepts the following options:
+
+	   base64
+	       Base64 compressed fingerprint (default)
+
+	   compressed
+	       Binary compressed fingerprint
+
+	   raw Binary raw fingerprint
+
+       silence_threshold threshold
+	   Threshold for detecting silence. Range is from "-1" to 32767, where
+	   "-1" disables silence detection. Silence detection can only be used
+	   with version 3 of the algorithm.
+
+	   Silence detection must be disabled for use with the AcoustID
+	   service. Default is "-1".
+
+   crc
+       CRC (Cyclic Redundancy Check) muxer.
+
+       This muxer computes and prints the Adler-32 CRC of all the input audio
+       and video frames. By default audio frames are converted to signed
+       16-bit raw audio and video frames to raw video before computing the
+       CRC.
+
+       The output of the muxer consists of a single line of the form:
+       CRC=0xCRC, where CRC is a hexadecimal number 0-padded to 8 digits
+       containing the CRC for all the decoded input frames.
+
+       See also the framecrc muxer.
+
+       Examples
+
+       o   Use ffmpeg to compute the CRC of the input, and store it in the
+	   file out.crc:
+
+		   ffmpeg -i INPUT -f crc out.crc
+
+       o   Use ffmpeg to print the CRC to stdout with the command:
+
+		   ffmpeg -i INPUT -f crc -
+
+       o   You can select the output format of each frame with ffmpeg by
+	   specifying the audio and video codec and format. For example, to
+	   compute the CRC of the input audio converted to PCM unsigned 8-bit
+	   and the input video converted to MPEG-2 video, use the command:
+
+		   ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f crc -
+
+   dash
+       Dynamic Adaptive Streaming over HTTP (DASH) muxer.
+
+       This muxer creates segments and manifest files according to the MPEG-
+       DASH standard ISO/IEC 23009-1:2014 and following standard updates.
+
+       For more information see:
+
+       o   ISO DASH Specification:
+	   <http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip>
+
+       o   WebM DASH Specification:
+	   <https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification>
+
+       This muxer creates an MPD (Media Presentation Description) manifest
+       file and segment files for each stream. Segment files are placed in the
+       same directory of the MPD manifest file.
+
+       The segment filename might contain pre-defined identifiers used in the
+       manifest "SegmentTemplate" section as defined in section 5.3.9.4.4 of
+       the standard.
+
+       Available identifiers are "$RepresentationID$", "$Number$",
+       "$Bandwidth$", and "$Time$". In addition to the standard identifiers,
+       an ffmpeg-specific "$ext$" identifier is also supported. When
+       specified, ffmpeg will replace "$ext$" in the file name with muxing
+       format's extensions such as "mp4", "webm" etc.
+
+       Options
+
+       adaptation_sets adaptation_sets
+	   Assign streams to adaptation sets, specified in the MPD manifest
+	   "AdaptationSets" section.
+
+	   An adaptation set contains a set of one or more streams accessed as
+	   a single subset, e.g. corresponding streams encoded at different
+	   size selectable by the user depending on the available bandwidth,
+	   or to different audio streams with a different language.
+
+	   Each adaptation set is specified with the syntax:
+
+		   id=<index>,streams=<streams>
+
+	   where index must be a numerical index, and streams is a sequence of
+	   ","-separated stream indices. Multiple adaptation sets can be
+	   specified, separated by spaces.
+
+	   To map all video (or audio) streams to an adaptation set, "v" (or
+	   "a") can be used as stream identifier instead of IDs.
+
+	   When no assignment is defined, this defaults to an adaptation set
+	   for each stream.
+
+	   The following optional fields can also be specified:
+
+	   descriptor
+	       Define the descriptor as defined by ISO/IEC
+	       23009-1:2014/Amd.2:2015.
+
+	       For example:
+
+		       <SupplementalProperty schemeIdUri=\"urn:mpeg:dash:srd:2014\" value=\"0,0,0,1,1,2,2\"/>
+
+	       The descriptor string should be a self-closing XML tag.
+
+	   frag_duration
+	       Override the global fragment duration specified with the
+	       frag_duration option.
+
+	   frag_type
+	       Override the global fragment type specified with the frag_type
+	       option.
+
+	   seg_duration
+	       Override the global segment duration specified with the
+	       seg_duration option.
+
+	   trick_id
+	       Mark an adaptation set as containing streams meant to be used
+	       for Trick Mode for the referenced adaptation set.
+
+	   A few examples of possible values for the adaptation_sets option
+	   follow:
+
+		   id=0,seg_duration=2,frag_duration=1,frag_type=duration,streams=v id=1,seg_duration=2,frag_type=none,streams=a
+
+		   id=0,seg_duration=2,frag_type=none,streams=0 id=1,seg_duration=10,frag_type=none,trick_id=0,streams=1
+
+       dash_segment_type type
+	   Set DASH segment files type.
+
+	   Possible values:
+
+	   auto
+	       The dash segment files format will be selected based on the
+	       stream codec. This is the default mode.
+
+	   mp4 the dash segment files will be in ISOBMFF/MP4 format
+
+	   webm
+	       the dash segment files will be in WebM format
+
+       extra_window_size size
+	   Set the maximum number of segments kept outside of the manifest
+	   before removing from disk.
+
+       format_options options_list
+	   Set container format (mp4/webm) options using a ":"-separated list
+	   of key=value parameters. Values containing ":" special characters
+	   must be escaped.
+
+       frag_duration duration
+	   Set the length in seconds of fragments within segments, fractional
+	   value can also be set.
+
+       frag_type type
+	   Set the type of interval for fragmentation.
+
+	   Possible values:
+
+	   auto
+	       set one fragment per segment
+
+	   every_frame
+	       fragment at every frame
+
+	   duration
+	       fragment at specific time intervals
+
+	   pframes
+	       fragment at keyframes and following P-Frame reordering (Video
+	       only, experimental)
+
+       global_sidx bool
+	   Write global "SIDX" atom. Applicable only for single file, mp4
+	   output, non-streaming mode.
+
+       hls_master_name file_name
+	   HLS master playlist name. Default is master.m3u8.
+
+       hls_playlist bool
+	   Generate HLS playlist files. The master playlist is generated with
+	   filename specified by the hls_master_name option. One media
+	   playlist file is generated for each stream with filenames
+	   media_0.m3u8, media_1.m3u8, etc.
+
+       http_opts http_opts
+	   Specify a list of ":"-separated key=value options to pass to the
+	   underlying HTTP protocol. Applicable only for HTTP output.
+
+       http_persistent bool
+	   Use persistent HTTP connections. Applicable only for HTTP output.
+
+       http_user_agent user_agent
+	   Override User-Agent field in HTTP header. Applicable only for HTTP
+	   output.
+
+       ignore_io_errors bool
+	   Ignore IO errors during open and write. Useful for long-duration
+	   runs with network output. This is disabled by default.
+
+       index_correction bool
+	   Enable or disable segment index correction logic. Applicable only
+	   when use_template is enabled and use_timeline is disabled. This is
+	   disabled by default.
+
+	   When enabled, the logic monitors the flow of segment indexes. If a
+	   streams's segment index value is not at the expected real time
+	   position, then the logic corrects that index value.
+
+	   Typically this logic is needed in live streaming use cases. The
+	   network bandwidth fluctuations are common during long run
+	   streaming. Each fluctuation can cause the segment indexes fall
+	   behind the expected real time position.
+
+       init_seg_name init_name
+	   DASH-templated name to use for the initialization segment. Default
+	   is "init-stream$RepresentationID$.$ext$". "$ext$" is replaced with
+	   the file name extension specific for the segment format.
+
+       ldash bool
+	   Enable Low-latency Dash by constraining the presence and values of
+	   some elements. This is disabled by default.
+
+       lhls bool
+	   Enable Low-latency HLS (LHLS). Add "#EXT-X-PREFETCH" tag with
+	   current segment's URI. hls.js player folks are trying to
+	   standardize an open LHLS spec. The draft spec is available at
+	   <https://github.com/video-dev/hlsjs-rfcs/blob/lhls-spec/proposals/0001-lhls.md>.
+
+	   This option tries to comply with the above open spec. It enables
+	   streaming and hls_playlist options automatically.  This is an
+	   experimental feature.
+
+	   Note: This is not Apple's version LHLS. See
+	   <https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis>
+
+       master_m3u8_publish_rate segment_intervals_count
+	   Publish master playlist repeatedly every after specified number of
+	   segment intervals.
+
+       max_playback_rate rate
+	   Set the maximum playback rate indicated as appropriate for the
+	   purposes of automatically adjusting playback latency and buffer
+	   occupancy during normal playback by clients.
+
+       media_seg_name segment_name
+	   DASH-templated name to use for the media segments. Default is
+	   "chunk-stream$RepresentationID$-$Number%05d$.$ext$". "$ext$" is
+	   replaced with the file name extension specific for the segment
+	   format.
+
+       method method
+	   Use the given HTTP method to create output files. Generally set to
+	   "PUT" or "POST".
+
+       min_playback_rate rate
+	   Set the minimum playback rate indicated as appropriate for the
+	   purposes of automatically adjusting playback latency and buffer
+	   occupancy during normal playback by clients.
+
+       mpd_profile flags
+	   Set one or more MPD manifest profiles.
+
+	   Possible values:
+
+	   dash
+	       MPEG-DASH ISO Base media file format live profile
+
+	   dvb_dash
+	       DVB-DASH profile
+
+	   Default value is "dash".
+
+       remove_at_exit bool
+	   Enable or disable removal of all segments when finished. This is
+	   disabled by default.
+
+       seg_duration duration
+	   Set the segment length in seconds (fractional value can be set).
+	   The value is treated as average segment duration when the
+	   use_template option is enabled and the use_timeline option is
+	   disabled and as minimum segment duration for all the other use
+	   cases.
+
+	   Default value is 5.
+
+       single_file bool
+	   Enable or disable storing all segments in one file, accessed using
+	   byte ranges. This is disabled by default.
+
+	   The name of the single file can be specified with the
+	   single_file_name option, if not specified assume the basename of
+	   the manifest file with the output format extension.
+
+       single_file_name file_name
+	   DASH-templated name to use for the manifest "baseURL" element.
+	   Imply that the single_file option is set to true. In the template,
+	   "$ext$" is replaced with the file name extension specific for the
+	   segment format.
+
+       streaming bool
+	   Enable or disable chunk streaming mode of output. In chunk
+	   streaming mode, each frame will be a "moof" fragment which forms a
+	   chunk. This is disabled by default.
+
+       target_latency target_latency
+	   Set an intended target latency in seconds for serving (fractional
+	   value can be set). Applicable only when the streaming and
+	   write_prft options are enabled. This is an informative fields
+	   clients can use to measure the latency of the service.
+
+       timeout timeout
+	   Set timeout for socket I/O operations expressed in seconds
+	   (fractional value can be set). Applicable only for HTTP output.
+
+       update_period period
+	   Set the MPD update period, for dynamic content. The unit is second.
+	   If set to 0, the period is automatically computed.
+
+	   Default value is 0.
+
+       use_template bool
+	   Enable or disable use of "SegmentTemplate" instead of "SegmentList"
+	   in the manifest. This is enabled by default.
+
+       use_timeline bool
+	   Enable or disable use of "SegmentTimeline" within the
+	   "SegmentTemplate" manifest section. This is enabled by default.
+
+       utc_timing_url url
+	   URL of the page that will return the UTC timestamp in ISO format,
+	   for example "https://time.akamai.com/?iso"
+
+       window_size size
+	   Set the maximum number of segments kept in the manifest, discard
+	   the oldest one. This is useful for live streaming.
+
+	   If the value is 0, all segments are kept in the manifest. Default
+	   value is 0.
+
+       write_prft write_prft
+	   Write Producer Reference Time elements on supported streams. This
+	   also enables writing prft boxes in the underlying muxer. Applicable
+	   only when the utc_url option is enabled. It is set to auto by
+	   default, in which case the muxer will attempt to enable it only in
+	   modes that require it.
+
+       Example
+
+       Generate a DASH output reading from an input source in realtime using
+       ffmpeg.
+
+       Two multimedia streams are generated from the input file, both
+       containing a video stream encoded through libx264, and an audio stream
+       encoded with libfdk_aac. The first multimedia stream contains video
+       with a bitrate of 800k and audio at the default rate, the second with
+       video scaled to 320x170 pixels at 300k and audio resampled at 22005 Hz.
+
+       The window_size option keeps only the latest 5 segments with the
+       default duration of 5 seconds.
+
+	       ffmpeg -re -i <input> -map 0 -map 0 -c:a libfdk_aac -c:v libx264 \
+	       -b:v:0 800k -profile:v:0 main \
+	       -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline -ar:a:1 22050 \
+	       -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 \
+	       -use_timeline 1 -use_template 1 -window_size 5 \
+	       -adaptation_sets "id=0,streams=v id=1,streams=a" \
+	       -f dash /path/to/out.mpd
+
+   daud
+       D-Cinema audio muxer.
+
+       It accepts a single 6-channels audio stream resampled at 96000 Hz
+       encoded with the pcm_24daud codec.
+
+       Example
+
+       Use ffmpeg to mux input audio to a 5.1 channel layout resampled at
+       96000Hz:
+
+	       ffmpeg -i INPUT -af aresample=96000,pan=5.1 slow.302
+
+       For ffmpeg versions before 7.0 you might have to use the asetnsamples
+       filter to limit the muxed packet size, because this format does not
+       support muxing packets larger than 65535 bytes (3640 samples). For
+       newer ffmpeg versions audio is automatically packetized to 36000 byte
+       (2000 sample) packets.
+
+   dv
+       DV (Digital Video) muxer.
+
+       It accepts exactly one dvvideo video stream and at most two pcm_s16
+       audio streams. More constraints are defined by the property of the
+       video, which must correspond to a DV video supported profile, and on
+       the framerate.
+
+       Example
+
+       Use ffmpeg to convert the input:
+
+	       ffmpeg -i INPUT -s:v 720x480 -pix_fmt yuv411p -r 29.97 -ac 2 -ar 48000 -y out.dv
+
+   ffmetadata
+       FFmpeg metadata muxer.
+
+       This muxer writes the streams metadata in the ffmetadata format.
+
+       See the Metadata chapter for information about the format.
+
+       Example
+
+       Use ffmpeg to extract metadata from an input file to a metadata.ffmeta
+       file in ffmetadata format:
+
+	       ffmpeg -i INPUT -f ffmetadata metadata.ffmeta
+
+   fifo
+       FIFO (First-In First-Out) muxer.
+
+       The fifo pseudo-muxer allows the separation of encoding and muxing by
+       using a first-in-first-out queue and running the actual muxer in a
+       separate thread.
+
+       This is especially useful in combination with the tee muxer and can be
+       used to send data to several destinations with different
+       reliability/writing speed/latency.
+
+       The target muxer is either selected from the output name or specified
+       through the fifo_format option.
+
+       The behavior of the fifo muxer if the queue fills up or if the output
+       fails (e.g. if a packet cannot be written to the output) is selectable:
+
+       o   Output can be transparently restarted with configurable delay
+	   between retries based on real time or time of the processed stream.
+
+       o   Encoding can be blocked during temporary failure, or continue
+	   transparently dropping packets in case the FIFO queue fills up.
+
+       API users should be aware that callback functions
+       ("interrupt_callback", "io_open" and "io_close") used within its
+       "AVFormatContext" must be thread-safe.
+
+       Options
+
+       attempt_recovery bool
+	   If failure occurs, attempt to recover the output. This is
+	   especially useful when used with network output, since it makes it
+	   possible to restart streaming transparently. By default this option
+	   is set to "false".
+
+       drop_pkts_on_overflow bool
+	   If set to "true", in case the fifo queue fills up, packets will be
+	   dropped rather than blocking the encoder. This makes it possible to
+	   continue streaming without delaying the input, at the cost of
+	   omitting part of the stream. By default this option is set to
+	   "false", so in such cases the encoder will be blocked until the
+	   muxer processes some of the packets and none of them is lost.
+
+       fifo_format format_name
+	   Specify the format name. Useful if it cannot be guessed from the
+	   output name suffix.
+
+       format_opts options
+	   Specify format options for the underlying muxer. Muxer options can
+	   be specified as a list of key=value pairs separated by ':'.
+
+       max_recovery_attempts count
+	   Set maximum number of successive unsuccessful recovery attempts
+	   after which the output fails permanently. By default this option is
+	   set to 0 (unlimited).
+
+       queue_size size
+	   Specify size of the queue as a number of packets. Default value is
+	   60.
+
+       recover_any_error bool
+	   If set to "true", recovery will be attempted regardless of type of
+	   the error causing the failure. By default this option is set to
+	   "false" and in case of certain (usually permanent) errors the
+	   recovery is not attempted even when the attempt_recovery option is
+	   set to "true".
+
+       recovery_wait_streamtime bool
+	   If set to "false", the real time is used when waiting for the
+	   recovery attempt (i.e. the recovery will be attempted after the
+	   time specified by the recovery_wait_time option).
+
+	   If set to "true", the time of the processed stream is taken into
+	   account instead (i.e. the recovery will be attempted after
+	   discarding the packets corresponding to the recovery_wait_time
+	   option).
+
+	   By default this option is set to "false".
+
+       recovery_wait_time duration
+	   Specify waiting time in seconds before the next recovery attempt
+	   after previous unsuccessful recovery attempt. Default value is 5.
+
+       restart_with_keyframe bool
+	   Specify whether to wait for the keyframe after recovering from
+	   queue overflow or failure. This option is set to "false" by
+	   default.
+
+       timeshift duration
+	   Buffer the specified amount of packets and delay writing the
+	   output. Note that the value of the queue_size option must be big
+	   enough to store the packets for timeshift. At the end of the input
+	   the fifo buffer is flushed at realtime speed.
+
+       Example
+
+       Use ffmpeg to stream to an RTMP server, continue processing the stream
+       at real-time rate even in case of temporary failure (network outage)
+       and attempt to recover streaming every second indefinitely:
+
+	       ffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifo_format flv \
+		 -drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 \
+		 -map 0:v -map 0:a rtmp://example.com/live/stream_name
+
+   film_cpk
+       Sega film (.cpk) muxer.
+
+       This format was used as internal format for several Sega games.
+
+       For more information regarding the Sega film file format, visit
+       <http://wiki.multimedia.cx/index.php?title=Sega_FILM>.
+
+       It accepts at maximum one cinepak or raw video stream, and at maximum
+       one audio stream.
+
+   filmstrip
+       Adobe Filmstrip muxer.
+
+       This format is used by several Adobe tools to store a generated
+       filmstrip export. It accepts a single raw video stream.
+
+   fits
+       Flexible Image Transport System (FITS) muxer.
+
+       This image format is used to store astronomical data.
+
+       For more information regarding the format, visit
+       <https://fits.gsfc.nasa.gov>.
+
+   flac
+       Raw FLAC audio muxer.
+
+       This muxer accepts exactly one FLAC audio stream. Additionally, it is
+       possible to add images with disposition attached_pic.
+
+       Options
+
+       write_header bool
+	   write the file header if set to "true", default is "true"
+
+       Example
+
+       Use ffmpeg to store the audio stream from an input file, together with
+       several pictures used with attached_pic disposition:
+
+	       ffmpeg -i INPUT -i pic1.png -i pic2.jpg -map 0:a -map 1 -map 2 -disposition:v attached_pic OUTPUT
+
+   flv
+       Adobe Flash Video Format muxer.
+
+       Options
+
+       flvflags flags
+	   Possible values:
+
+	   aac_seq_header_detect
+	       Place AAC sequence header based on audio stream data.
+
+	   no_sequence_end
+	       Disable sequence end tag.
+
+	   no_metadata
+	       Disable metadata tag.
+
+	   no_duration_filesize
+	       Disable duration and filesize in metadata when they are equal
+	       to zero at the end of stream. (Be used to non-seekable living
+	       stream).
+
+	   add_keyframe_index
+	       Used to facilitate seeking; particularly for HTTP pseudo
+	       streaming.
+
+   framecrc
+       Per-packet CRC (Cyclic Redundancy Check) testing format.
+
+       This muxer computes and prints the Adler-32 CRC for each audio and
+       video packet. By default audio frames are converted to signed 16-bit
+       raw audio and video frames to raw video before computing the CRC.
+
+       The output of the muxer consists of a line for each audio and video
+       packet of the form:
+
+	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, 0x<CRC>
+
+       CRC is a hexadecimal number 0-padded to 8 digits containing the CRC of
+       the packet.
+
+       Examples
+
+       For example to compute the CRC of the audio and video frames in INPUT,
+       converted to raw audio and video packets, and store it in the file
+       out.crc:
+
+	       ffmpeg -i INPUT -f framecrc out.crc
+
+       To print the information to stdout, use the command:
+
+	       ffmpeg -i INPUT -f framecrc -
+
+       With ffmpeg, you can select the output format to which the audio and
+       video frames are encoded before computing the CRC for each packet by
+       specifying the audio and video codec. For example, to compute the CRC
+       of each decoded input audio frame converted to PCM unsigned 8-bit and
+       of each decoded input video frame converted to MPEG-2 video, use the
+       command:
+
+	       ffmpeg -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -
+
+       See also the crc muxer.
+
+   framehash
+       Per-packet hash testing format.
+
+       This muxer computes and prints a cryptographic hash for each audio and
+       video packet. This can be used for packet-by-packet equality checks
+       without having to individually do a binary comparison on each.
+
+       By default audio frames are converted to signed 16-bit raw audio and
+       video frames to raw video before computing the hash, but the output of
+       explicit conversions to other codecs can also be used. It uses the
+       SHA-256 cryptographic hash function by default, but supports several
+       other algorithms.
+
+       The output of the muxer consists of a line for each audio and video
+       packet of the form:
+
+	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, <hash>
+
+       hash is a hexadecimal number representing the computed hash for the
+       packet.
+
+       hash algorithm
+	   Use the cryptographic hash function specified by the string
+	   algorithm.  Supported values include "MD5", "murmur3", "RIPEMD128",
+	   "RIPEMD160", "RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
+	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
+	   and "adler32".
+
+       Examples
+
+       To compute the SHA-256 hash of the audio and video frames in INPUT,
+       converted to raw audio and video packets, and store it in the file
+       out.sha256:
+
+	       ffmpeg -i INPUT -f framehash out.sha256
+
+       To print the information to stdout, using the MD5 hash function, use
+       the command:
+
+	       ffmpeg -i INPUT -f framehash -hash md5 -
+
+       See also the hash muxer.
+
+   framemd5
+       Per-packet MD5 testing format.
+
+       This is a variant of the framehash muxer. Unlike that muxer, it
+       defaults to using the MD5 hash function.
+
+       Examples
+
+       To compute the MD5 hash of the audio and video frames in INPUT,
+       converted to raw audio and video packets, and store it in the file
+       out.md5:
+
+	       ffmpeg -i INPUT -f framemd5 out.md5
+
+       To print the information to stdout, use the command:
+
+	       ffmpeg -i INPUT -f framemd5 -
+
+       See also the framehash and md5 muxers.
+
+   gif
+       Animated GIF muxer.
+
+       Note that the GIF format has a very large time base: the delay between
+       two frames can therefore not be smaller than one centi second.
+
+       Options
+
+       loop bool
+	   Set the number of times to loop the output. Use "-1" for no loop, 0
+	   for looping indefinitely (default).
+
+       final_delay delay
+	   Force the delay (expressed in centiseconds) after the last frame.
+	   Each frame ends with a delay until the next frame. The default is
+	   "-1", which is a special value to tell the muxer to re-use the
+	   previous delay. In case of a loop, you might want to customize this
+	   value to mark a pause for instance.
+
+       Example
+
+       Encode a gif looping 10 times, with a 5 seconds delay between the
+       loops:
+
+	       ffmpeg -i INPUT -loop 10 -final_delay 500 out.gif
+
+       Note 1: if you wish to extract the frames into separate GIF files, you
+       need to force the image2 muxer:
+
+	       ffmpeg -i INPUT -c:v gif -f image2 "out%d.gif"
+
+   gxf
+       General eXchange Format (GXF) muxer.
+
+       GXF was developed by Grass Valley Group, then standardized by SMPTE as
+       SMPTE 360M and was extended in SMPTE RDD 14-2007 to include high-
+       definition video resolutions.
+
+       It accepts at most one video stream with codec mjpeg, or mpeg1video, or
+       mpeg2video, or dvvideo with resolution 512x480 or 608x576, and several
+       audio streams with rate 48000Hz and codec pcm16_le.
+
+   hash
+       Hash testing format.
+
+       This muxer computes and prints a cryptographic hash of all the input
+       audio and video frames. This can be used for equality checks without
+       having to do a complete binary comparison.
+
+       By default audio frames are converted to signed 16-bit raw audio and
+       video frames to raw video before computing the hash, but the output of
+       explicit conversions to other codecs can also be used. Timestamps are
+       ignored. It uses the SHA-256 cryptographic hash function by default,
+       but supports several other algorithms.
+
+       The output of the muxer consists of a single line of the form:
+       algo=hash, where algo is a short string representing the hash function
+       used, and hash is a hexadecimal number representing the computed hash.
+
+       hash algorithm
+	   Use the cryptographic hash function specified by the string
+	   algorithm.  Supported values include "MD5", "murmur3", "RIPEMD128",
+	   "RIPEMD160", "RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
+	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
+	   and "adler32".
+
+       Examples
+
+       To compute the SHA-256 hash of the input converted to raw audio and
+       video, and store it in the file out.sha256:
+
+	       ffmpeg -i INPUT -f hash out.sha256
+
+       To print an MD5 hash to stdout use the command:
+
+	       ffmpeg -i INPUT -f hash -hash md5 -
+
+       See also the framehash muxer.
+
+   hds
+       HTTP Dynamic Streaming (HDS) muxer.
+
+       HTTP dynamic streaming, or HDS, is an adaptive bitrate streaming method
+       developed by Adobe. HDS delivers MP4 video content over HTTP
+       connections. HDS can be used for on-demand streaming or live streaming.
+
+       This muxer creates an .f4m (Adobe Flash Media Manifest File) manifest,
+       an .abst (Adobe Bootstrap File) for each stream, and segment files in a
+       directory specified as the output.
+
+       These needs to be accessed by an HDS player throuhg HTTPS for it to be
+       able to perform playback on the generated stream.
+
+       Options
+
+       extra_window_size int
+	   number of fragments kept outside of the manifest before removing
+	   from disk
+
+       min_frag_duration microseconds
+	   minimum fragment duration (in microseconds), default value is 1
+	   second (10000000)
+
+       remove_at_exit bool
+	   remove all fragments when finished when set to "true"
+
+       window_size int
+	   number of fragments kept in the manifest, if set to a value
+	   different from 0. By default all segments are kept in the output
+	   directory.
+
+       Example
+
+       Use ffmpeg to generate HDS files to the output.hds directory in real-
+       time rate:
+
+	       ffmpeg -re -i INPUT -f hds -b:v 200k output.hds
+
+   hls
+       Apple HTTP Live Streaming muxer that segments MPEG-TS according to the
+       HTTP Live Streaming (HLS) specification.
+
+       It creates a playlist file, and one or more segment files. The output
+       filename specifies the playlist filename.
+
+       By default, the muxer creates a file for each segment produced. These
+       files have the same name as the playlist, followed by a sequential
+       number and a .ts extension.
+
+       Make sure to require a closed GOP when encoding and to set the GOP size
+       to fit your segment time constraint.
+
+       For example, to convert an input file with ffmpeg:
+
+	       ffmpeg -i in.mkv -c:v h264 -flags +cgop -g 30 -hls_time 1 out.m3u8
+
+       This example will produce the playlist, out.m3u8, and segment files:
+       out0.ts, out1.ts, out2.ts, etc.
+
+       See also the segment muxer, which provides a more generic and flexible
+       implementation of a segmenter, and can be used to perform HLS
+       segmentation.
+
+       Options
+
+       This muxer supports the following options:
+
+       hls_init_time duration
+	   Set the initial target segment length. Default value is 0.
+
+	   duration must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.
+
+	   Segment will be cut on the next key frame after this time has
+	   passed on the first m3u8 list.  After the initial playlist is
+	   filled ffmpeg will cut segments at duration equal to "hls_time"
+
+       hls_time duration
+	   Set the target segment length. Default value is 2.
+
+	   duration must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.  Segment will be
+	   cut on the next key frame after this time has passed.
+
+       hls_list_size size
+	   Set the maximum number of playlist entries. If set to 0 the list
+	   file will contain all the segments. Default value is 5.
+
+       hls_delete_threshold size
+	   Set the number of unreferenced segments to keep on disk before
+	   "hls_flags delete_segments" deletes them. Increase this to allow
+	   continue clients to download segments which were recently
+	   referenced in the playlist. Default value is 1, meaning segments
+	   older than "hls_list_size+1" will be deleted.
+
+       hls_start_number_source
+	   Start the playlist sequence number ("#EXT-X-MEDIA-SEQUENCE")
+	   according to the specified source.  Unless "hls_flags single_file"
+	   is set, it also specifies source of starting sequence numbers of
+	   segment and subtitle filenames. In any case, if "hls_flags
+	   append_list" is set and read playlist sequence number is greater
+	   than the specified start sequence number, then that value will be
+	   used as start value.
+
+	   It accepts the following values:
+
+	   generic (default)
+	       Set the starting sequence numbers according to start_number
+	       option value.
+
+	   epoch
+	       The start number will be the seconds since epoch (1970-01-01
+	       00:00:00)
+
+	   epoch_us
+	       The start number will be the microseconds since epoch
+	       (1970-01-01 00:00:00)
+
+	   datetime
+	       The start number will be based on the current date/time as
+	       YYYYmmddHHMMSS. e.g. 20161231235759.
+
+       start_number number
+	   Start the playlist sequence number ("#EXT-X-MEDIA-SEQUENCE") from
+	   the specified number when hls_start_number_source value is generic.
+	   (This is the default case.)	Unless "hls_flags single_file" is set,
+	   it also specifies starting sequence numbers of segment and subtitle
+	   filenames.  Default value is 0.
+
+       hls_allow_cache allowcache
+	   Explicitly set whether the client MAY (1) or MUST NOT (0) cache
+	   media segments.
+
+       hls_base_url baseurl
+	   Append baseurl to every entry in the playlist.  Useful to generate
+	   playlists with absolute paths.
+
+	   Note that the playlist sequence number must be unique for each
+	   segment and it is not to be confused with the segment filename
+	   sequence number which can be cyclic, for example if the wrap option
+	   is specified.
+
+       hls_segment_filename filename
+	   Set the segment filename. Unless "hls_flags single_file" is set,
+	   filename is used as a string format with the segment number:
+
+		   ffmpeg -i in.nut -hls_segment_filename 'file%03d.ts' out.m3u8
+
+	   This example will produce the playlist, out.m3u8, and segment
+	   files: file000.ts, file001.ts, file002.ts, etc.
+
+	   filename may contain full path or relative path specification, but
+	   only the file name part without any path info will be contained in
+	   the m3u8 segment list.  Should a relative path be specified, the
+	   path of the created segment files will be relative to the current
+	   working directory.  When strftime_mkdir is set, the whole expanded
+	   value of filename will be written into the m3u8 segment list.
+
+	   When "var_stream_map" is set with two or more variant streams, the
+	   filename pattern must contain the string "%v", this string
+	   specifies the position of variant stream index in the generated
+	   segment file names.
+
+		   ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     -hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8
+
+	   This example will produce the playlists segment file sets:
+	   file_0_000.ts, file_0_001.ts, file_0_002.ts, etc. and
+	   file_1_000.ts, file_1_001.ts, file_1_002.ts, etc.
+
+	   The string "%v" may be present in the filename or in the last
+	   directory name containing the file, but only in one of them.
+	   (Additionally, %v may appear multiple times in the last sub-
+	   directory or filename.) If the string %v is present in the
+	   directory name, then sub-directories are created after expanding
+	   the directory name pattern. This enables creation of segments
+	   corresponding to different variant streams in subdirectories.
+
+		   ffmpeg -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     -hls_segment_filename 'vs%v/file_%03d.ts' vs%v/out.m3u8
+
+	   This example will produce the playlists segment file sets:
+	   vs0/file_000.ts, vs0/file_001.ts, vs0/file_002.ts, etc. and
+	   vs1/file_000.ts, vs1/file_001.ts, vs1/file_002.ts, etc.
+
+       strftime
+	   Use strftime() on filename to expand the segment filename with
+	   localtime.  The segment number is also available in this mode, but
+	   to use it, you need to specify second_level_segment_index hls_flag
+	   and %%d will be the specifier.
+
+		   ffmpeg -i in.nut -strftime 1 -hls_segment_filename 'file-%Y%m%d-%s.ts' out.m3u8
+
+	   This example will produce the playlist, out.m3u8, and segment
+	   files: file-20160215-1455569023.ts, file-20160215-1455569024.ts,
+	   etc.  Note: On some systems/environments, the %s specifier is not
+	   available. See
+	     "strftime()" documentation.
+
+		   ffmpeg -i in.nut -strftime 1 -hls_flags second_level_segment_index -hls_segment_filename 'file-%Y%m%d-%%04d.ts' out.m3u8
+
+	   This example will produce the playlist, out.m3u8, and segment
+	   files: file-20160215-0001.ts, file-20160215-0002.ts, etc.
+
+       strftime_mkdir
+	   Used together with -strftime_mkdir, it will create all
+	   subdirectories which is expanded in filename.
+
+		   ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8
+
+	   This example will create a directory 201560215 (if it does not
+	   exist), and then produce the playlist, out.m3u8, and segment files:
+	   20160215/file-20160215-1455569023.ts,
+	   20160215/file-20160215-1455569024.ts, etc.
+
+		   ffmpeg -i in.nut -strftime 1 -strftime_mkdir 1 -hls_segment_filename '%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8
+
+	   This example will create a directory hierarchy 2016/02/15 (if any
+	   of them do not exist), and then produce the playlist, out.m3u8, and
+	   segment files: 2016/02/15/file-20160215-1455569023.ts,
+	   2016/02/15/file-20160215-1455569024.ts, etc.
+
+       hls_segment_options options_list
+	   Set output format options using a :-separated list of key=value
+	   parameters. Values containing ":" special characters must be
+	   escaped.
+
+       hls_key_info_file key_info_file
+	   Use the information in key_info_file for segment encryption. The
+	   first line of key_info_file specifies the key URI written to the
+	   playlist. The key URL is used to access the encryption key during
+	   playback. The second line specifies the path to the key file used
+	   to obtain the key during the encryption process. The key file is
+	   read as a single packed array of 16 octets in binary format. The
+	   optional third line specifies the initialization vector (IV) as a
+	   hexadecimal string to be used instead of the segment sequence
+	   number (default) for encryption. Changes to key_info_file will
+	   result in segment encryption with the new key/IV and an entry in
+	   the playlist for the new key URI/IV if "hls_flags periodic_rekey"
+	   is enabled.
+
+	   Key info file format:
+
+		   <key URI>
+		   <key file path>
+		   <IV> (optional)
+
+	   Example key URIs:
+
+		   http://server/file.key
+		   /path/to/file.key
+		   file.key
+
+	   Example key file paths:
+
+		   file.key
+		   /path/to/file.key
+
+	   Example IV:
+
+		   0123456789ABCDEF0123456789ABCDEF
+
+	   Key info file example:
+
+		   http://server/file.key
+		   /path/to/file.key
+		   0123456789ABCDEF0123456789ABCDEF
+
+	   Example shell script:
+
+		   #!/bin/sh
+		   BASE_URL=${1:-'.'}
+		   openssl rand 16 > file.key
+		   echo $BASE_URL/file.key > file.keyinfo
+		   echo file.key >> file.keyinfo
+		   echo $(openssl rand -hex 16) >> file.keyinfo
+		   ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
+		     -hls_key_info_file file.keyinfo out.m3u8
+
+       -hls_enc enc
+	   Enable (1) or disable (0) the AES128 encryption.  When enabled
+	   every segment generated is encrypted and the encryption key is
+	   saved as playlist name.key.
+
+       -hls_enc_key key
+	   16-octet key to encrypt the segments, by default it is randomly
+	   generated.
+
+       -hls_enc_key_url keyurl
+	   If set, keyurl is prepended instead of baseurl to the key filename
+	   in the playlist.
+
+       -hls_enc_iv iv
+	   16-octet initialization vector for every segment instead of the
+	   autogenerated ones.
+
+       hls_segment_type flags
+	   Possible values:
+
+	   mpegts
+	       Output segment files in MPEG-2 Transport Stream format. This is
+	       compatible with all HLS versions.
+
+	   fmp4
+	       Output segment files in fragmented MP4 format, similar to MPEG-
+	       DASH.  fmp4 files may be used in HLS version 7 and above.
+
+       hls_fmp4_init_filename filename
+	   Set filename to the fragment files header file, default filename is
+	   init.mp4.
+
+	   Use "-strftime 1" on filename to expand the segment filename with
+	   localtime.
+
+		   ffmpeg -i in.nut  -hls_segment_type fmp4 -strftime 1 -hls_fmp4_init_filename "%s_init.mp4" out.m3u8
+
+	   This will produce init like this 1602678741_init.mp4
+
+       hls_fmp4_init_resend
+	   Resend init file after m3u8 file refresh every time, default is 0.
+
+	   When "var_stream_map" is set with two or more variant streams, the
+	   filename pattern must contain the string "%v", this string
+	   specifies the position of variant stream index in the generated
+	   init file names.  The string "%v" may be present in the filename or
+	   in the last directory name containing the file. If the string is
+	   present in the directory name, then sub-directories are created
+	   after expanding the directory name pattern. This enables creation
+	   of init files corresponding to different variant streams in
+	   subdirectories.
+
+       hls_flags flags
+	   Possible values:
+
+	   single_file
+	       If this flag is set, the muxer will store all segments in a
+	       single MPEG-TS file, and will use byte ranges in the playlist.
+	       HLS playlists generated with this way will have the version
+	       number 4.  For example:
+
+		       ffmpeg -i in.nut -hls_flags single_file out.m3u8
+
+	       Will produce the playlist, out.m3u8, and a single segment file,
+	       out.ts.
+
+	   delete_segments
+	       Segment files removed from the playlist are deleted after a
+	       period of time equal to the duration of the segment plus the
+	       duration of the playlist.
+
+	   append_list
+	       Append new segments into the end of old segment list, and
+	       remove the "#EXT-X-ENDLIST" from the old segment list.
+
+	   round_durations
+	       Round the duration info in the playlist file segment info to
+	       integer values, instead of using floating point.  If there are
+	       no other features requiring higher HLS versions be used, then
+	       this will allow ffmpeg to output a HLS version 2 m3u8.
+
+	   discont_start
+	       Add the "#EXT-X-DISCONTINUITY" tag to the playlist, before the
+	       first segment's information.
+
+	   omit_endlist
+	       Do not append the "EXT-X-ENDLIST" tag at the end of the
+	       playlist.
+
+	   periodic_rekey
+	       The file specified by "hls_key_info_file" will be checked
+	       periodically and detect updates to the encryption info. Be sure
+	       to replace this file atomically, including the file containing
+	       the AES encryption key.
+
+	   independent_segments
+	       Add the "#EXT-X-INDEPENDENT-SEGMENTS" to playlists that has
+	       video segments and when all the segments of that playlist are
+	       guaranteed to start with a Key frame.
+
+	   iframes_only
+	       Add the "#EXT-X-I-FRAMES-ONLY" to playlists that has video
+	       segments and can play only I-frames in the "#EXT-X-BYTERANGE"
+	       mode.
+
+	   split_by_time
+	       Allow segments to start on frames other than keyframes. This
+	       improves behavior on some players when the time between
+	       keyframes is inconsistent, but may make things worse on others,
+	       and can cause some oddities during seeking. This flag should be
+	       used with the "hls_time" option.
+
+	   program_date_time
+	       Generate "EXT-X-PROGRAM-DATE-TIME" tags.
+
+	   second_level_segment_index
+	       Makes it possible to use segment indexes as %%d in
+	       hls_segment_filename expression besides date/time values when
+	       strftime is on.	To get fixed width numbers with trailing
+	       zeroes, %%0xd format is available where x is the required
+	       width.
+
+	   second_level_segment_size
+	       Makes it possible to use segment sizes (counted in bytes) as
+	       %%s in hls_segment_filename expression besides date/time values
+	       when strftime is on.  To get fixed width numbers with trailing
+	       zeroes, %%0xs format is available where x is the required
+	       width.
+
+	   second_level_segment_duration
+	       Makes it possible to use segment duration (calculated  in
+	       microseconds) as %%t in hls_segment_filename expression besides
+	       date/time values when strftime is on.  To get fixed width
+	       numbers with trailing zeroes, %%0xt format is available where x
+	       is the required width.
+
+		       ffmpeg -i sample.mpeg \
+			  -f hls -hls_time 3 -hls_list_size 5 \
+			  -hls_flags second_level_segment_index+second_level_segment_size+second_level_segment_duration \
+			  -strftime 1 -strftime_mkdir 1 -hls_segment_filename "segment_%Y%m%d%H%M%S_%%04d_%%08s_%%013t.ts" stream.m3u8
+
+	       This will produce segments like this:
+	       segment_20170102194334_0003_00122200_0000003000000.ts,
+	       segment_20170102194334_0004_00120072_0000003000000.ts etc.
+
+	   temp_file
+	       Write segment data to filename.tmp and rename to filename only
+	       once the segment is complete. A webserver serving up segments
+	       can be configured to reject requests to *.tmp to prevent access
+	       to in-progress segments before they have been added to the m3u8
+	       playlist. This flag also affects how m3u8 playlist files are
+	       created.  If this flag is set, all playlist files will written
+	       into temporary file and renamed after they are complete,
+	       similarly as segments are handled.  But playlists with "file"
+	       protocol and with type ("hls_playlist_type") other than "vod"
+	       are always written into temporary file regardless of this flag.
+	       Master playlist files ("master_pl_name"), if any, with "file"
+	       protocol, are always written into temporary file regardless of
+	       this flag if "master_pl_publish_rate" value is other than zero.
+
+       hls_playlist_type event
+	   Emit "#EXT-X-PLAYLIST-TYPE:EVENT" in the m3u8 header. Forces
+	   hls_list_size to 0; the playlist can only be appended to.
+
+       hls_playlist_type vod
+	   Emit "#EXT-X-PLAYLIST-TYPE:VOD" in the m3u8 header. Forces
+	   hls_list_size to 0; the playlist must not change.
+
+       method
+	   Use the given HTTP method to create the hls files.
+
+		   ffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8
+
+	   This example will upload all the mpegts segment files to the HTTP
+	   server using the HTTP PUT method, and update the m3u8 files every
+	   "refresh" times using the same method.  Note that the HTTP server
+	   must support the given method for uploading files.
+
+       http_user_agent
+	   Override User-Agent field in HTTP header. Applicable only for HTTP
+	   output.
+
+       var_stream_map
+	   Map string which specifies how to group the audio, video and
+	   subtitle streams into different variant streams. The variant stream
+	   groups are separated by space.  Expected string format is like this
+	   "a:0,v:0 a:1,v:1 ....". Here a:, v:, s: are the keys to specify
+	   audio, video and subtitle streams respectively.  Allowed values are
+	   0 to 9 (limited just based on practical usage).
+
+	   When there are two or more variant streams, the output filename
+	   pattern must contain the string "%v", this string specifies the
+	   position of variant stream index in the output media playlist
+	   filenames. The string "%v" may be present in the filename or in the
+	   last directory name containing the file. If the string is present
+	   in the directory name, then sub-directories are created after
+	   expanding the directory name pattern. This enables creation of
+	   variant streams in subdirectories.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two hls variant streams. The first variant
+	   stream will contain video stream of bitrate 1000k and audio stream
+	   of bitrate 64k and the second variant stream will contain video
+	   stream of bitrate 256k and audio stream of bitrate 32k. Here, two
+	   media playlist with file names out_0.m3u8 and out_1.m3u8 will be
+	   created. If you want something meaningful text instead of indexes
+	   in result names, you may specify names for each or some of the
+	   variants as in the following example.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0,name:my_hd v:1,a:1,name:my_sd" \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two hls variant streams as in the previous
+	   one.  But here, the two media playlist with file names
+	   out_my_hd.m3u8 and out_my_sd.m3u8 will be created.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k \
+		     -map 0:v -map 0:a -map 0:v -f hls -var_stream_map "v:0 a:0 v:1" \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates three hls variant streams. The first variant
+	   stream will be a video only stream with video bitrate 1000k, the
+	   second variant stream will be an audio only stream with bitrate 64k
+	   and the third variant stream will be a video only stream with
+	   bitrate 256k. Here, three media playlist with file names
+	   out_0.m3u8, out_1.m3u8 and out_2.m3u8 will be created.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1" \
+		     http://example.com/live/vs_%v/out.m3u8
+
+	   This example creates the variant streams in subdirectories. Here,
+	   the first media playlist is created at
+	   http://example.com/live/vs_0/out.m3u8 and the second one at
+	   http://example.com/live/vs_1/out.m3u8.
+
+		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k -b:v:1 3000k	\
+		     -map 0:a -map 0:a -map 0:v -map 0:v -f hls \
+		     -var_stream_map "a:0,agroup:aud_low a:1,agroup:aud_high v:0,agroup:aud_low v:1,agroup:aud_high" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two audio only and two video only variant
+	   streams. In addition to the #EXT-X-STREAM-INF tag for each variant
+	   stream in the master playlist, #EXT-X-MEDIA tag is also added for
+	   the two audio only variant streams and they are mapped to the two
+	   video only variant streams with audio group names 'aud_low' and
+	   'aud_high'.
+
+	   By default, a single hls variant containing all the encoded streams
+	   is created.
+
+		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
+		     -map 0:a -map 0:a -map 0:v -f hls \
+		     -var_stream_map "a:0,agroup:aud_low,default:yes a:1,agroup:aud_low v:0,agroup:aud_low" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two audio only and one video only variant
+	   streams. In addition to the #EXT-X-STREAM-INF tag for each variant
+	   stream in the master playlist, #EXT-X-MEDIA tag is also added for
+	   the two audio only variant streams and they are mapped to the one
+	   video only variant streams with audio group name 'aud_low', and the
+	   audio group have default stat is NO or YES.
+
+	   By default, a single hls variant containing all the encoded streams
+	   is created.
+
+		   ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \
+		     -map 0:a -map 0:a -map 0:v -f hls \
+		     -var_stream_map "a:0,agroup:aud_low,default:yes,language:ENG a:1,agroup:aud_low,language:CHN v:0,agroup:aud_low" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example creates two audio only and one video only variant
+	   streams. In addition to the #EXT-X-STREAM-INF tag for each variant
+	   stream in the master playlist, #EXT-X-MEDIA tag is also added for
+	   the two audio only variant streams and they are mapped to the one
+	   video only variant streams with audio group name 'aud_low', and the
+	   audio group have default stat is NO or YES, and one audio have and
+	   language is named ENG, the other audio language is named CHN.
+
+	   By default, a single hls variant containing all the encoded streams
+	   is created.
+
+		   ffmpeg -y -i input_with_subtitle.mkv \
+		    -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
+		    -b:a:0 256k \
+		    -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
+		    -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
+		    -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
+		    10 -master_pl_publish_rate 10  -hls_flags \
+		    delete_segments+discont_start+split_by_time ./tmp/video.m3u8
+
+	   This example adds "#EXT-X-MEDIA" tag with "TYPE=SUBTITLES" in the
+	   master playlist with webvtt subtitle group name 'subtitle'. Please
+	   make sure the input file has one text subtitle stream at least.
+
+       cc_stream_map
+	   Map string which specifies different closed captions groups and
+	   their attributes. The closed captions stream groups are separated
+	   by space.  Expected string format is like this "ccgroup:<group
+	   name>,instreamid:<INSTREAM-ID>,language:<language code> ....".
+	   'ccgroup' and 'instreamid' are mandatory attributes. 'language' is
+	   an optional attribute.  The closed captions groups configured using
+	   this option are mapped to different variant streams by providing
+	   the same 'ccgroup' name in the "var_stream_map" string. If
+	   "var_stream_map" is not set, then the first available ccgroup in
+	   "cc_stream_map" is mapped to the output variant stream. The
+	   examples for these two use cases are given below.
+
+		   ffmpeg -re -i in.ts -b:v 1000k -b:a 64k -a53cc 1 -f hls \
+		     -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out.m3u8
+
+	   This example adds "#EXT-X-MEDIA" tag with "TYPE=CLOSED-CAPTIONS" in
+	   the master playlist with group name 'cc', language 'en' (english)
+	   and INSTREAM-ID 'CC1'. Also, it adds "CLOSED-CAPTIONS" attribute
+	   with group name 'cc' for the output variant stream.
+
+		   ffmpeg -re -i in.ts -b:v:0 1000k -b:v:1 256k -b:a:0 64k -b:a:1 32k \
+		     -a53cc:0 1 -a53cc:1 1\
+		     -map 0:v -map 0:a -map 0:v -map 0:a -f hls \
+		     -cc_stream_map "ccgroup:cc,instreamid:CC1,language:en ccgroup:cc,instreamid:CC2,language:sp" \
+		     -var_stream_map "v:0,a:0,ccgroup:cc v:1,a:1,ccgroup:cc" \
+		     -master_pl_name master.m3u8 \
+		     http://example.com/live/out_%v.m3u8
+
+	   This example adds two "#EXT-X-MEDIA" tags with
+	   "TYPE=CLOSED-CAPTIONS" in the master playlist for the INSTREAM-IDs
+	   'CC1' and 'CC2'. Also, it adds "CLOSED-CAPTIONS" attribute with
+	   group name 'cc' for the two output variant streams.
+
+       master_pl_name
+	   Create HLS master playlist with the given name.
+
+		   ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 http://example.com/live/out.m3u8
+
+	   This example creates HLS master playlist with name master.m3u8 and
+	   it is published at http://example.com/live/
+
+       master_pl_publish_rate
+	   Publish master play list repeatedly every after specified number of
+	   segment intervals.
+
+		   ffmpeg -re -i in.ts -f hls -master_pl_name master.m3u8 \
+		   -hls_time 2 -master_pl_publish_rate 30 http://example.com/live/out.m3u8
+
+	   This example creates HLS master playlist with name master.m3u8 and
+	   keep publishing it repeatedly every after 30 segments i.e. every
+	   after 60s.
+
+       http_persistent
+	   Use persistent HTTP connections. Applicable only for HTTP output.
+
+       timeout
+	   Set timeout for socket I/O operations. Applicable only for HTTP
+	   output.
+
+       ignore_io_errors
+	   Ignore IO errors during open, write and delete. Useful for long-
+	   duration runs with network output.
+
+       headers
+	   Set custom HTTP headers, can override built in default headers.
+	   Applicable only for HTTP output.
+
+   ico
+       ICO file muxer.
+
+       Microsoft's icon file format (ICO) has some strict limitations that
+       should be noted:
+
+       o   Size cannot exceed 256 pixels in any dimension
+
+       o   Only BMP and PNG images can be stored
+
+       o   If a BMP image is used, it must be one of the following pixel
+	   formats:
+
+		   BMP Bit Depth      FFmpeg Pixel Format
+		   1bit 	      pal8
+		   4bit 	      pal8
+		   8bit 	      pal8
+		   16bit	      rgb555le
+		   24bit	      bgr24
+		   32bit	      bgra
+
+       o   If a BMP image is used, it must use the BITMAPINFOHEADER DIB header
+
+       o   If a PNG image is used, it must use the rgba pixel format
+
+   image2
+       Image file muxer.
+
+       The image file muxer writes video frames to image files.
+
+       The output filenames are specified by a pattern, which can be used to
+       produce sequentially numbered series of files.  The pattern may contain
+       the string "%d" or "%0Nd", this string specifies the position of the
+       characters representing a numbering in the filenames. If the form
+       "%0Nd" is used, the string representing the number in each filename is
+       0-padded to N digits. The literal character '%' can be specified in the
+       pattern with the string "%%".
+
+       If the pattern contains "%d" or "%0Nd", the first filename of the file
+       list specified will contain the number 1, all the following numbers
+       will be sequential.
+
+       The pattern may contain a suffix which is used to automatically
+       determine the format of the image files to write.
+
+       For example the pattern "img-%03d.bmp" will specify a sequence of
+       filenames of the form img-001.bmp, img-002.bmp, ..., img-010.bmp, etc.
+       The pattern "img%%-%d.jpg" will specify a sequence of filenames of the
+       form img%-1.jpg, img%-2.jpg, ..., img%-10.jpg, etc.
+
+       The image muxer supports the .Y.U.V image file format. This format is
+       special in that each image frame consists of three files, for each of
+       the YUV420P components. To read or write this image file format,
+       specify the name of the '.Y' file. The muxer will automatically open
+       the '.U' and '.V' files as required.
+
+       Options
+
+       frame_pts
+	   If set to 1, expand the filename with pts from pkt->pts.  Default
+	   value is 0.
+
+       start_number
+	   Start the sequence from the specified number. Default value is 1.
+
+       update
+	   If set to 1, the filename will always be interpreted as just a
+	   filename, not a pattern, and the corresponding file will be
+	   continuously overwritten with new images. Default value is 0.
+
+       strftime
+	   If set to 1, expand the filename with date and time information
+	   from "strftime()". Default value is 0.
+
+       atomic_writing
+	   Write output to a temporary file, which is renamed to target
+	   filename once writing is completed. Default is disabled.
+
+       protocol_opts options_list
+	   Set protocol options as a :-separated list of key=value parameters.
+	   Values containing the ":" special character must be escaped.
+
+       Examples
+
+       The following example shows how to use ffmpeg for creating a sequence
+       of files img-001.jpeg, img-002.jpeg, ..., taking one image every second
+       from the input video:
+
+	       ffmpeg -i in.avi -vsync cfr -r 1 -f image2 'img-%03d.jpeg'
+
+       Note that with ffmpeg, if the format is not specified with the "-f"
+       option and the output filename specifies an image file format, the
+       image2 muxer is automatically selected, so the previous command can be
+       written as:
+
+	       ffmpeg -i in.avi -vsync cfr -r 1 'img-%03d.jpeg'
+
+       Note also that the pattern must not necessarily contain "%d" or "%0Nd",
+       for example to create a single image file img.jpeg from the start of
+       the input video you can employ the command:
+
+	       ffmpeg -i in.avi -f image2 -frames:v 1 img.jpeg
+
+       The strftime option allows you to expand the filename with date and
+       time information. Check the documentation of the "strftime()" function
+       for the syntax.
+
+       For example to generate image files from the "strftime()"
+       "%Y-%m-%d_%H-%M-%S" pattern, the following ffmpeg command can be used:
+
+	       ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1 "%Y-%m-%d_%H-%M-%S.jpg"
+
+       You can set the file name with current frame's PTS:
+
+	       ffmpeg -f v4l2 -r 1 -i /dev/video0 -copyts -f image2 -frame_pts true %d.jpg
+
+       A more complex example is to publish contents of your desktop directly
+       to a WebDAV server every second:
+
+	       ffmpeg -f x11grab -framerate 1 -i :0.0 -q:v 6 -update 1 -protocol_opts method=PUT http://example.com/desktop.jpg
+
+   matroska
+       Matroska container muxer.
+
+       This muxer implements the matroska and webm container specs.
+
+       Metadata
+
+       The recognized metadata settings in this muxer are:
+
+       title
+	   Set title name provided to a single track. This gets mapped to the
+	   FileDescription element for a stream written as attachment.
+
+       language
+	   Specify the language of the track in the Matroska languages form.
+
+	   The language can be either the 3 letters bibliographic ISO-639-2
+	   (ISO 639-2/B) form (like "fre" for French), or a language code
+	   mixed with a country code for specialities in languages (like "fre-
+	   ca" for Canadian French).
+
+       stereo_mode
+	   Set stereo 3D video layout of two views in a single video track.
+
+	   The following values are recognized:
+
+	   mono
+	       video is not stereo
+
+	   left_right
+	       Both views are arranged side by side, Left-eye view is on the
+	       left
+
+	   bottom_top
+	       Both views are arranged in top-bottom orientation, Left-eye
+	       view is at bottom
+
+	   top_bottom
+	       Both views are arranged in top-bottom orientation, Left-eye
+	       view is on top
+
+	   checkerboard_rl
+	       Each view is arranged in a checkerboard interleaved pattern,
+	       Left-eye view being first
+
+	   checkerboard_lr
+	       Each view is arranged in a checkerboard interleaved pattern,
+	       Right-eye view being first
+
+	   row_interleaved_rl
+	       Each view is constituted by a row based interleaving, Right-eye
+	       view is first row
+
+	   row_interleaved_lr
+	       Each view is constituted by a row based interleaving, Left-eye
+	       view is first row
+
+	   col_interleaved_rl
+	       Both views are arranged in a column based interleaving manner,
+	       Right-eye view is first column
+
+	   col_interleaved_lr
+	       Both views are arranged in a column based interleaving manner,
+	       Left-eye view is first column
+
+	   anaglyph_cyan_red
+	       All frames are in anaglyph format viewable through red-cyan
+	       filters
+
+	   right_left
+	       Both views are arranged side by side, Right-eye view is on the
+	       left
+
+	   anaglyph_green_magenta
+	       All frames are in anaglyph format viewable through green-
+	       magenta filters
+
+	   block_lr
+	       Both eyes laced in one Block, Left-eye view is first
+
+	   block_rl
+	       Both eyes laced in one Block, Right-eye view is first
+
+       For example a 3D WebM clip can be created using the following command
+       line:
+
+	       ffmpeg -i sample_left_right_clip.mpg -an -c:v libvpx -metadata stereo_mode=left_right -y stereo_clip.webm
+
+       Options
+
+       This muxer supports the following options:
+
+       reserve_index_space
+	   By default, this muxer writes the index for seeking (called cues in
+	   Matroska terms) at the end of the file, because it cannot know in
+	   advance how much space to leave for the index at the beginning of
+	   the file. However for some use cases -- e.g.  streaming where
+	   seeking is possible but slow -- it is useful to put the index at
+	   the beginning of the file.
+
+	   If this option is set to a non-zero value, the muxer will reserve a
+	   given amount of space in the file header and then try to write the
+	   cues there when the muxing finishes. If the reserved space does not
+	   suffice, no Cues will be written, the file will be finalized and
+	   writing the trailer will return an error.  A safe size for most use
+	   cases should be about 50kB per hour of video.
+
+	   Note that cues are only written if the output is seekable and this
+	   option will have no effect if it is not.
+
+       cues_to_front
+	   If set, the muxer will write the index at the beginning of the file
+	   by shifting the main data if necessary. This can be combined with
+	   reserve_index_space in which case the data is only shifted if the
+	   initially reserved space turns out to be insufficient.
+
+	   This option is ignored if the output is unseekable.
+
+       default_mode
+	   This option controls how the FlagDefault of the output tracks will
+	   be set.  It influences which tracks players should play by default.
+	   The default mode is passthrough.
+
+	   infer
+	       Every track with disposition default will have the FlagDefault
+	       set.  Additionally, for each type of track (audio, video or
+	       subtitle), if no track with disposition default of this type
+	       exists, then the first track of this type will be marked as
+	       default (if existing). This ensures that the default flag is
+	       set in a sensible way even if the input originated from
+	       containers that lack the concept of default tracks.
+
+	   infer_no_subs
+	       This mode is the same as infer except that if no subtitle track
+	       with disposition default exists, no subtitle track will be
+	       marked as default.
+
+	   passthrough
+	       In this mode the FlagDefault is set if and only if the
+	       AV_DISPOSITION_DEFAULT flag is set in the disposition of the
+	       corresponding stream.
+
+       flipped_raw_rgb
+	   If set to true, store positive height for raw RGB bitmaps, which
+	   indicates bitmap is stored bottom-up. Note that this option does
+	   not flip the bitmap which has to be done manually beforehand, e.g.
+	   by using the vflip filter.  Default is false and indicates bitmap
+	   is stored top down.
+
+   md5
+       MD5 testing format.
+
+       This is a variant of the hash muxer. Unlike that muxer, it defaults to
+       using the MD5 hash function.
+
+       Examples
+
+       To compute the MD5 hash of the input converted to raw audio and video,
+       and store it in the file out.md5:
+
+	       ffmpeg -i INPUT -f md5 out.md5
+
+       You can print the MD5 to stdout with the command:
+
+	       ffmpeg -i INPUT -f md5 -
+
+       See also the hash and framemd5 muxers.
+
+   mp3
+       The MP3 muxer writes a raw MP3 stream with the following optional
+       features:
+
+       o   An ID3v2 metadata header at the beginning (enabled by default).
+	   Versions 2.3 and 2.4 are supported, the "id3v2_version" private
+	   option controls which one is used (3 or 4). Setting "id3v2_version"
+	   to 0 disables the ID3v2 header completely.
+
+	   The muxer supports writing attached pictures (APIC frames) to the
+	   ID3v2 header.  The pictures are supplied to the muxer in form of a
+	   video stream with a single packet. There can be any number of those
+	   streams, each will correspond to a single APIC frame.  The stream
+	   metadata tags title and comment map to APIC description and picture
+	   type respectively. See <http://id3.org/id3v2.4.0-frames> for
+	   allowed picture types.
+
+	   Note that the APIC frames must be written at the beginning, so the
+	   muxer will buffer the audio frames until it gets all the pictures.
+	   It is therefore advised to provide the pictures as soon as possible
+	   to avoid excessive buffering.
+
+       o   A Xing/LAME frame right after the ID3v2 header (if present). It is
+	   enabled by default, but will be written only if the output is
+	   seekable. The "write_xing" private option can be used to disable
+	   it.	The frame contains various information that may be useful to
+	   the decoder, like the audio duration or encoder delay.
+
+       o   A legacy ID3v1 tag at the end of the file (disabled by default). It
+	   may be enabled with the "write_id3v1" private option, but as its
+	   capabilities are very limited, its usage is not recommended.
+
+       Examples:
+
+       Write an mp3 with an ID3v2.3 header and an ID3v1 footer:
+
+	       ffmpeg -i INPUT -id3v2_version 3 -write_id3v1 1 out.mp3
+
+       To attach a picture to an mp3 file select both the audio and the
+       picture stream with "map":
+
+	       ffmpeg -i input.mp3 -i cover.png -c copy -map 0 -map 1
+	       -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3
+
+       Write a "clean" MP3 without any extra features:
+
+	       ffmpeg -i input.wav -write_xing 0 -id3v2_version 0 out.mp3
+
+   mpegts
+       MPEG transport stream muxer.
+
+       This muxer implements ISO 13818-1 and part of ETSI EN 300 468.
+
+       The recognized metadata settings in mpegts muxer are "service_provider"
+       and "service_name". If they are not set the default for
+       "service_provider" is FFmpeg and the default for "service_name" is
+       Service01.
+
+       Options
+
+       The muxer options are:
+
+       mpegts_transport_stream_id integer
+	   Set the transport_stream_id. This identifies a transponder in DVB.
+	   Default is 0x0001.
+
+       mpegts_original_network_id integer
+	   Set the original_network_id. This is unique identifier of a network
+	   in DVB. Its main use is in the unique identification of a service
+	   through the path Original_Network_ID, Transport_Stream_ID. Default
+	   is 0x0001.
+
+       mpegts_service_id integer
+	   Set the service_id, also known as program in DVB. Default is
+	   0x0001.
+
+       mpegts_service_type integer
+	   Set the program service_type. Default is "digital_tv".  Accepts the
+	   following options:
+
+	   hex_value
+	       Any hexadecimal value between 0x01 and 0xff as defined in ETSI
+	       300 468.
+
+	   digital_tv
+	       Digital TV service.
+
+	   digital_radio
+	       Digital Radio service.
+
+	   teletext
+	       Teletext service.
+
+	   advanced_codec_digital_radio
+	       Advanced Codec Digital Radio service.
+
+	   mpeg2_digital_hdtv
+	       MPEG2 Digital HDTV service.
+
+	   advanced_codec_digital_sdtv
+	       Advanced Codec Digital SDTV service.
+
+	   advanced_codec_digital_hdtv
+	       Advanced Codec Digital HDTV service.
+
+       mpegts_pmt_start_pid integer
+	   Set the first PID for PMTs. Default is 0x1000, minimum is 0x0020,
+	   maximum is 0x1ffa. This option has no effect in m2ts mode where the
+	   PMT PID is fixed 0x0100.
+
+       mpegts_start_pid integer
+	   Set the first PID for elementary streams. Default is 0x0100,
+	   minimum is 0x0020, maximum is 0x1ffa. This option has no effect in
+	   m2ts mode where the elementary stream PIDs are fixed.
+
+       mpegts_m2ts_mode boolean
+	   Enable m2ts mode if set to 1. Default value is "-1" which disables
+	   m2ts mode.
+
+       muxrate integer
+	   Set a constant muxrate. Default is VBR.
+
+       pes_payload_size integer
+	   Set minimum PES packet payload in bytes. Default is 2930.
+
+       mpegts_flags flags
+	   Set mpegts flags. Accepts the following options:
+
+	   resend_headers
+	       Reemit PAT/PMT before writing the next packet.
+
+	   latm
+	       Use LATM packetization for AAC.
+
+	   pat_pmt_at_frames
+	       Reemit PAT and PMT at each video frame.
+
+	   system_b
+	       Conform to System B (DVB) instead of System A (ATSC).
+
+	   initial_discontinuity
+	       Mark the initial packet of each stream as discontinuity.
+
+	   nit Emit NIT table.
+
+	   omit_rai
+	       Disable writing of random access indicator.
+
+       mpegts_copyts boolean
+	   Preserve original timestamps, if value is set to 1. Default value
+	   is "-1", which results in shifting timestamps so that they start
+	   from 0.
+
+       omit_video_pes_length boolean
+	   Omit the PES packet length for video packets. Default is 1 (true).
+
+       pcr_period integer
+	   Override the default PCR retransmission time in milliseconds.
+	   Default is "-1" which means that the PCR interval will be
+	   determined automatically: 20 ms is used for CBR streams, the
+	   highest multiple of the frame duration which is less than 100 ms is
+	   used for VBR streams.
+
+       pat_period duration
+	   Maximum time in seconds between PAT/PMT tables. Default is 0.1.
+
+       sdt_period duration
+	   Maximum time in seconds between SDT tables. Default is 0.5.
+
+       nit_period duration
+	   Maximum time in seconds between NIT tables. Default is 0.5.
+
+       tables_version integer
+	   Set PAT, PMT, SDT and NIT version (default 0, valid values are from
+	   0 to 31, inclusively).  This option allows updating stream
+	   structure so that standard consumer may detect the change. To do
+	   so, reopen output "AVFormatContext" (in case of API usage) or
+	   restart ffmpeg instance, cyclically changing tables_version value:
+
+		   ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
+		   ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
+		   ...
+		   ffmpeg -i source3.ts -codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
+		   ffmpeg -i source1.ts -codec copy -f mpegts -tables_version 0 udp://1.1.1.1:1111
+		   ffmpeg -i source2.ts -codec copy -f mpegts -tables_version 1 udp://1.1.1.1:1111
+		   ...
+
+       Example
+
+	       ffmpeg -i file.mpg -c copy \
+		    -mpegts_original_network_id 0x1122 \
+		    -mpegts_transport_stream_id 0x3344 \
+		    -mpegts_service_id 0x5566 \
+		    -mpegts_pmt_start_pid 0x1500 \
+		    -mpegts_start_pid 0x150 \
+		    -metadata service_provider="Some provider" \
+		    -metadata service_name="Some Channel" \
+		    out.ts
+
+   mxf, mxf_d10, mxf_opatom
+       MXF muxer.
+
+       Options
+
+       The muxer options are:
+
+       store_user_comments bool
+	   Set if user comments should be stored if available or never.  IRT
+	   D-10 does not allow user comments. The default is thus to write
+	   them for mxf and mxf_opatom but not for mxf_d10
+
+   null
+       Null muxer.
+
+       This muxer does not generate any output file, it is mainly useful for
+       testing or benchmarking purposes.
+
+       For example to benchmark decoding with ffmpeg you can use the command:
+
+	       ffmpeg -benchmark -i INPUT -f null out.null
+
+       Note that the above command does not read or write the out.null file,
+       but specifying the output file is required by the ffmpeg syntax.
+
+       Alternatively you can write the command as:
+
+	       ffmpeg -benchmark -i INPUT -f null -
+
+   nut
+       -syncpoints flags
+	   Change the syncpoint usage in nut:
+
+	   default use the normal low-overhead seeking aids.
+	   none do not use the syncpoints at all, reducing the overhead but
+	   making the stream non-seekable;
+		   Use of this option is not recommended, as the resulting files are very damage
+		   sensitive and seeking is not possible. Also in general the overhead from
+		   syncpoints is negligible. Note, -C<write_index> 0 can be used to disable
+		   all growing data tables, allowing to mux endless streams with limited memory
+		   and without these disadvantages.
+
+	   timestamped extend the syncpoint with a wallclock field.
+
+	   The none and timestamped flags are experimental.
+
+       -write_index bool
+	   Write index at the end, the default is to write an index.
+
+	       ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor
+
+   ogg
+       Ogg container muxer.
+
+       -page_duration duration
+	   Preferred page duration, in microseconds. The muxer will attempt to
+	   create pages that are approximately duration microseconds long.
+	   This allows the user to compromise between seek granularity and
+	   container overhead. The default is 1 second. A value of 0 will fill
+	   all segments, making pages as large as possible. A value of 1 will
+	   effectively use 1 packet-per-page in most situations, giving a
+	   small seek granularity at the cost of additional container
+	   overhead.
+
+       -serial_offset value
+	   Serial value from which to set the streams serial number.  Setting
+	   it to different and sufficiently large values ensures that the
+	   produced ogg files can be safely chained.
+
+   rcwt
+       Raw Captions With Time (RCWT) is a format native to ccextractor, a
+       commonly used open source tool for processing 608/708 closed caption
+       (CC) sources.  It can be used to archive the original, raw CC bitstream
+       and to produce a source file for later CC processing or conversion. As
+       a result, it also allows for interopability with ccextractor for
+       processing CC data extracted via ffmpeg. The format is simple to parse
+       and can be used to retain all lines and variants of CC.
+
+       This muxer implements the specification as of 2024-01-05, which has
+       been stable and unchanged for 10 years as of this writing.
+
+       This muxer will have some nuances from the way that ccextractor muxes
+       RCWT.  No compatibility issues when processing the output with
+       ccextractor have been observed as a result of this so far, but mileage
+       may vary and outputs will not be a bit-exact match.
+
+       A free specification of RCWT can be found here:
+       <https://github.com/CCExtractor/ccextractor/blob/master/docs/BINARY_FILE_FORMAT.TXT>
+
+   segment, stream_segment, ssegment
+       Basic stream segmenter.
+
+       This muxer outputs streams to a number of separate files of nearly
+       fixed duration. Output filename pattern can be set in a fashion similar
+       to image2, or by using a "strftime" template if the strftime option is
+       enabled.
+
+       "stream_segment" is a variant of the muxer used to write to streaming
+       output formats, i.e. which do not require global headers, and is
+       recommended for outputting e.g. to MPEG transport stream segments.
+       "ssegment" is a shorter alias for "stream_segment".
+
+       Every segment starts with a keyframe of the selected reference stream,
+       which is set through the reference_stream option.
+
+       Note that if you want accurate splitting for a video file, you need to
+       make the input key frames correspond to the exact splitting times
+       expected by the segmenter, or the segment muxer will start the new
+       segment with the key frame found next after the specified start time.
+
+       The segment muxer works best with a single constant frame rate video.
+
+       Optionally it can generate a list of the created segments, by setting
+       the option segment_list. The list type is specified by the
+       segment_list_type option. The entry filenames in the segment list are
+       set by default to the basename of the corresponding segment files.
+
+       See also the hls muxer, which provides a more specific implementation
+       for HLS segmentation.
+
+       Options
+
+       The segment muxer supports the following options:
+
+       increment_tc 1|0
+	   if set to 1, increment timecode between each segment If this is
+	   selected, the input need to have a timecode in the first video
+	   stream. Default value is 0.
+
+       reference_stream specifier
+	   Set the reference stream, as specified by the string specifier.  If
+	   specifier is set to "auto", the reference is chosen automatically.
+	   Otherwise it must be a stream specifier (see the ``Stream
+	   specifiers'' chapter in the ffmpeg manual) which specifies the
+	   reference stream. The default value is "auto".
+
+       segment_format format
+	   Override the inner container format, by default it is guessed by
+	   the filename extension.
+
+       segment_format_options options_list
+	   Set output format options using a :-separated list of key=value
+	   parameters. Values containing the ":" special character must be
+	   escaped.
+
+       segment_list name
+	   Generate also a listfile named name. If not specified no listfile
+	   is generated.
+
+       segment_list_flags flags
+	   Set flags affecting the segment list generation.
+
+	   It currently supports the following flags:
+
+	   cache
+	       Allow caching (only affects M3U8 list files).
+
+	   live
+	       Allow live-friendly file generation.
+
+       segment_list_size size
+	   Update the list file so that it contains at most size segments. If
+	   0 the list file will contain all the segments. Default value is 0.
+
+       segment_list_entry_prefix prefix
+	   Prepend prefix to each entry. Useful to generate absolute paths.
+	   By default no prefix is applied.
+
+       segment_list_type type
+	   Select the listing format.
+
+	   The following values are recognized:
+
+	   flat
+	       Generate a flat list for the created segments, one segment per
+	       line.
+
+	   csv, ext
+	       Generate a list for the created segments, one segment per line,
+	       each line matching the format (comma-separated values):
+
+		       <segment_filename>,<segment_start_time>,<segment_end_time>
+
+	       segment_filename is the name of the output file generated by
+	       the muxer according to the provided pattern. CSV escaping
+	       (according to RFC4180) is applied if required.
+
+	       segment_start_time and segment_end_time specify the segment
+	       start and end time expressed in seconds.
+
+	       A list file with the suffix ".csv" or ".ext" will auto-select
+	       this format.
+
+	       ext is deprecated in favor or csv.
+
+	   ffconcat
+	       Generate an ffconcat file for the created segments. The
+	       resulting file can be read using the FFmpeg concat demuxer.
+
+	       A list file with the suffix ".ffcat" or ".ffconcat" will auto-
+	       select this format.
+
+	   m3u8
+	       Generate an extended M3U8 file, version 3, compliant with
+	       <http://tools.ietf.org/id/draft-pantos-http-live-streaming>.
+
+	       A list file with the suffix ".m3u8" will auto-select this
+	       format.
+
+	   If not specified the type is guessed from the list file name
+	   suffix.
+
+       segment_time time
+	   Set segment duration to time, the value must be a duration
+	   specification. Default value is "2". See also the segment_times
+	   option.
+
+	   Note that splitting may not be accurate, unless you force the
+	   reference stream key-frames at the given time. See the introductory
+	   notice and the examples below.
+
+       min_seg_duration time
+	   Set minimum segment duration to time, the value must be a duration
+	   specification. This prevents the muxer ending segments at a
+	   duration below this value. Only effective with "segment_time".
+	   Default value is "0".
+
+       segment_atclocktime 1|0
+	   If set to "1" split at regular clock time intervals starting from
+	   00:00 o'clock. The time value specified in segment_time is used for
+	   setting the length of the splitting interval.
+
+	   For example with segment_time set to "900" this makes it possible
+	   to create files at 12:00 o'clock, 12:15, 12:30, etc.
+
+	   Default value is "0".
+
+       segment_clocktime_offset duration
+	   Delay the segment splitting times with the specified duration when
+	   using segment_atclocktime.
+
+	   For example with segment_time set to "900" and
+	   segment_clocktime_offset set to "300" this makes it possible to
+	   create files at 12:05, 12:20, 12:35, etc.
+
+	   Default value is "0".
+
+       segment_clocktime_wrap_duration duration
+	   Force the segmenter to only start a new segment if a packet reaches
+	   the muxer within the specified duration after the segmenting clock
+	   time. This way you can make the segmenter more resilient to
+	   backward local time jumps, such as leap seconds or transition to
+	   standard time from daylight savings time.
+
+	   Default is the maximum possible duration which means starting a new
+	   segment regardless of the elapsed time since the last clock time.
+
+       segment_time_delta delta
+	   Specify the accuracy time when selecting the start time for a
+	   segment, expressed as a duration specification. Default value is
+	   "0".
+
+	   When delta is specified a key-frame will start a new segment if its
+	   PTS satisfies the relation:
+
+		   PTS >= start_time - time_delta
+
+	   This option is useful when splitting video content, which is always
+	   split at GOP boundaries, in case a key frame is found just before
+	   the specified split time.
+
+	   In particular may be used in combination with the ffmpeg option
+	   force_key_frames. The key frame times specified by force_key_frames
+	   may not be set accurately because of rounding issues, with the
+	   consequence that a key frame time may result set just before the
+	   specified time. For constant frame rate videos a value of
+	   1/(2*frame_rate) should address the worst case mismatch between the
+	   specified time and the time set by force_key_frames.
+
+       segment_times times
+	   Specify a list of split points. times contains a list of comma
+	   separated duration specifications, in increasing order. See also
+	   the segment_time option.
+
+       segment_frames frames
+	   Specify a list of split video frame numbers. frames contains a list
+	   of comma separated integer numbers, in increasing order.
+
+	   This option specifies to start a new segment whenever a reference
+	   stream key frame is found and the sequential number (starting from
+	   0) of the frame is greater or equal to the next value in the list.
+
+       segment_wrap limit
+	   Wrap around segment index once it reaches limit.
+
+       segment_start_number number
+	   Set the sequence number of the first segment. Defaults to 0.
+
+       strftime 1|0
+	   Use the "strftime" function to define the name of the new segments
+	   to write. If this is selected, the output segment name must contain
+	   a "strftime" function template. Default value is 0.
+
+       break_non_keyframes 1|0
+	   If enabled, allow segments to start on frames other than keyframes.
+	   This improves behavior on some players when the time between
+	   keyframes is inconsistent, but may make things worse on others, and
+	   can cause some oddities during seeking. Defaults to 0.
+
+       reset_timestamps 1|0
+	   Reset timestamps at the beginning of each segment, so that each
+	   segment will start with near-zero timestamps. It is meant to ease
+	   the playback of the generated segments. May not work with some
+	   combinations of muxers/codecs. It is set to 0 by default.
+
+       initial_offset offset
+	   Specify timestamp offset to apply to the output packet timestamps.
+	   The argument must be a time duration specification, and defaults to
+	   0.
+
+       write_empty_segments 1|0
+	   If enabled, write an empty segment if there are no packets during
+	   the period a segment would usually span. Otherwise, the segment
+	   will be filled with the next packet written. Defaults to 0.
+
+       Make sure to require a closed GOP when encoding and to set the GOP size
+       to fit your segment time constraint.
+
+       Examples
+
+       o   Remux the content of file in.mkv to a list of segments out-000.nut,
+	   out-001.nut, etc., and write the list of generated segments to
+	   out.list:
+
+		   ffmpeg -i in.mkv -codec hevc -flags +cgop -g 60 -map 0 -f segment -segment_list out.list out%03d.nut
+
+       o   Segment input and set output format options for the output
+	   segments:
+
+		   ffmpeg -i in.mkv -f segment -segment_time 10 -segment_format_options movflags=+faststart out%03d.mp4
+
+       o   Segment the input file according to the split points specified by
+	   the segment_times option:
+
+		   ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 out%03d.nut
+
+       o   Use the ffmpeg force_key_frames option to force key frames in the
+	   input at the specified location, together with the segment option
+	   segment_time_delta to account for possible roundings operated when
+	   setting key frame times.
+
+		   ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le -map 0 \
+		   -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut
+
+	   In order to force key frames on the input file, transcoding is
+	   required.
+
+       o   Segment the input file by splitting the input file according to the
+	   frame numbers sequence specified with the segment_frames option:
+
+		   ffmpeg -i in.mkv -codec copy -map 0 -f segment -segment_list out.csv -segment_frames 100,200,300,500,800 out%03d.nut
+
+       o   Convert the in.mkv to TS segments using the "libx264" and "aac"
+	   encoders:
+
+		   ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segment_list out.list out%03d.ts
+
+       o   Segment the input file, and create an M3U8 live playlist (can be
+	   used as live HLS source):
+
+		   ffmpeg -re -i in.mkv -codec copy -map 0 -f segment -segment_list playlist.m3u8 \
+		   -segment_list_flags +live -segment_time 10 out%03d.mkv
+
+   smoothstreaming
+       Smooth Streaming muxer generates a set of files (Manifest, chunks)
+       suitable for serving with conventional web server.
+
+       window_size
+	   Specify the number of fragments kept in the manifest. Default 0
+	   (keep all).
+
+       extra_window_size
+	   Specify the number of fragments kept outside of the manifest before
+	   removing from disk. Default 5.
+
+       lookahead_count
+	   Specify the number of lookahead fragments. Default 2.
+
+       min_frag_duration
+	   Specify the minimum fragment duration (in microseconds). Default
+	   5000000.
+
+       remove_at_exit
+	   Specify whether to remove all fragments when finished. Default 0
+	   (do not remove).
+
+   streamhash
+       Per stream hash testing format.
+
+       This muxer computes and prints a cryptographic hash of all the input
+       frames, on a per-stream basis. This can be used for equality checks
+       without having to do a complete binary comparison.
+
+       By default audio frames are converted to signed 16-bit raw audio and
+       video frames to raw video before computing the hash, but the output of
+       explicit conversions to other codecs can also be used. Timestamps are
+       ignored. It uses the SHA-256 cryptographic hash function by default,
+       but supports several other algorithms.
+
+       The output of the muxer consists of one line per stream of the form:
+       streamindex,streamtype,algo=hash, where streamindex is the index of the
+       mapped stream, streamtype is a single character indicating the type of
+       stream, algo is a short string representing the hash function used, and
+       hash is a hexadecimal number representing the computed hash.
+
+       hash algorithm
+	   Use the cryptographic hash function specified by the string
+	   algorithm.  Supported values include "MD5", "murmur3", "RIPEMD128",
+	   "RIPEMD160", "RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
+	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
+	   and "adler32".
+
+       Examples
+
+       To compute the SHA-256 hash of the input converted to raw audio and
+       video, and store it in the file out.sha256:
+
+	       ffmpeg -i INPUT -f streamhash out.sha256
+
+       To print an MD5 hash to stdout use the command:
+
+	       ffmpeg -i INPUT -f streamhash -hash md5 -
+
+       See also the hash and framehash muxers.
+
+   tee
+       The tee muxer can be used to write the same data to several outputs,
+       such as files or streams.  It can be used, for example, to stream a
+       video over a network and save it to disk at the same time.
+
+       It is different from specifying several outputs to the ffmpeg command-
+       line tool. With the tee muxer, the audio and video data will be encoded
+       only once.  With conventional multiple outputs, multiple encoding
+       operations in parallel are initiated, which can be a very expensive
+       process. The tee muxer is not useful when using the libavformat API
+       directly because it is then possible to feed the same packets to
+       several muxers directly.
+
+       Since the tee muxer does not represent any particular output format,
+       ffmpeg cannot auto-select output streams. So all streams intended for
+       output must be specified using "-map". See the examples below.
+
+       Some encoders may need different options depending on the output
+       format; the auto-detection of this can not work with the tee muxer, so
+       they need to be explicitly specified.  The main example is the
+       global_header flag.
+
+       The slave outputs are specified in the file name given to the muxer,
+       separated by '|'. If any of the slave name contains the '|' separator,
+       leading or trailing spaces or any special character, those must be
+       escaped (see the "Quoting and escaping" section in the ffmpeg-utils(1)
+       manual).
+
+       Options
+
+       use_fifo bool
+	   If set to 1, slave outputs will be processed in separate threads
+	   using the fifo muxer. This allows to compensate for different
+	   speed/latency/reliability of outputs and setup transparent
+	   recovery. By default this feature is turned off.
+
+       fifo_options
+	   Options to pass to fifo pseudo-muxer instances. See fifo.
+
+       Muxer options can be specified for each slave by prepending them as a
+       list of key=value pairs separated by ':', between square brackets. If
+       the options values contain a special character or the ':' separator,
+       they must be escaped; note that this is a second level escaping.
+
+       The following special options are also recognized:
+
+       f   Specify the format name. Required if it cannot be guessed from the
+	   output URL.
+
+       bsfs[/spec]
+	   Specify a list of bitstream filters to apply to the specified
+	   output.
+
+	   It is possible to specify to which streams a given bitstream filter
+	   applies, by appending a stream specifier to the option separated by
+	   "/". spec must be a stream specifier (see Format stream
+	   specifiers).
+
+	   If the stream specifier is not specified, the bitstream filters
+	   will be applied to all streams in the output. This will cause that
+	   output operation to fail if the output contains streams to which
+	   the bitstream filter cannot be applied e.g. "h264_mp4toannexb"
+	   being applied to an output containing an audio stream.
+
+	   Options for a bitstream filter must be specified in the form of
+	   "opt=value".
+
+	   Several bitstream filters can be specified, separated by ",".
+
+       use_fifo bool
+	   This allows to override tee muxer use_fifo option for individual
+	   slave muxer.
+
+       fifo_options
+	   This allows to override tee muxer fifo_options for individual slave
+	   muxer.  See fifo.
+
+       select
+	   Select the streams that should be mapped to the slave output,
+	   specified by a stream specifier. If not specified, this defaults to
+	   all the mapped streams. This will cause that output operation to
+	   fail if the output format does not accept all mapped streams.
+
+	   You may use multiple stream specifiers separated by commas (",")
+	   e.g.: "a:0,v"
+
+       onfail
+	   Specify behaviour on output failure. This can be set to either
+	   "abort" (which is default) or "ignore". "abort" will cause whole
+	   process to fail in case of failure on this slave output. "ignore"
+	   will ignore failure on this output, so other outputs will continue
+	   without being affected.
+
+       Examples
+
+       o   Encode something and both archive it in a WebM file and stream it
+	   as MPEG-TS over UDP:
+
+		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
+		     "archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
+
+       o   As above, but continue streaming even if output to local file fails
+	   (for example local drive fills up):
+
+		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
+		     "[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"
+
+       o   Use ffmpeg to encode the input, and send the output to three
+	   different destinations. The "dump_extra" bitstream filter is used
+	   to add extradata information to all the output video keyframes
+	   packets, as requested by the MPEG-TS format. The select option is
+	   applied to out.aac in order to make it contain only audio packets.
+
+		   ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
+			  -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"
+
+       o   As above, but select only stream "a:1" for the audio output. Note
+	   that a second level escaping must be performed, as ":" is a special
+	   character used to separate options.
+
+		   ffmpeg -i ... -map 0 -flags +global_header -c:v libx264 -c:a aac
+			  -f tee "[bsfs/v=dump_extra=freq=keyframe]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"
+
+   webm_chunk
+       WebM Live Chunk Muxer.
+
+       This muxer writes out WebM headers and chunks as separate files which
+       can be consumed by clients that support WebM Live streams via DASH.
+
+       Options
+
+       This muxer supports the following options:
+
+       chunk_start_index
+	   Index of the first chunk (defaults to 0).
+
+       header
+	   Filename of the header where the initialization data will be
+	   written.
+
+       audio_chunk_duration
+	   Duration of each audio chunk in milliseconds (defaults to 5000).
+
+       Example
+
+	       ffmpeg -f v4l2 -i /dev/video0 \
+		      -f alsa -i hw:0 \
+		      -map 0:0 \
+		      -c:v libvpx-vp9 \
+		      -s 640x360 -keyint_min 30 -g 30 \
+		      -f webm_chunk \
+		      -header webm_live_video_360.hdr \
+		      -chunk_start_index 1 \
+		      webm_live_video_360_%d.chk \
+		      -map 1:0 \
+		      -c:a libvorbis \
+		      -b:a 128k \
+		      -f webm_chunk \
+		      -header webm_live_audio_128.hdr \
+		      -chunk_start_index 1 \
+		      -audio_chunk_duration 1000 \
+		      webm_live_audio_128_%d.chk
+
+   webm_dash_manifest
+       WebM DASH Manifest muxer.
+
+       This muxer implements the WebM DASH Manifest specification to generate
+       the DASH manifest XML. It also supports manifest generation for DASH
+       live streams.
+
+       For more information see:
+
+       o   WebM DASH Specification:
+	   <https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification>
+
+       o   ISO DASH Specification:
+	   <http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip>
+
+       Options
+
+       This muxer supports the following options:
+
+       adaptation_sets
+	   This option has the following syntax: "id=x,streams=a,b,c
+	   id=y,streams=d,e" where x and y are the unique identifiers of the
+	   adaptation sets and a,b,c,d and e are the indices of the
+	   corresponding audio and video streams. Any number of adaptation
+	   sets can be added using this option.
+
+       live
+	   Set this to 1 to create a live stream DASH Manifest. Default: 0.
+
+       chunk_start_index
+	   Start index of the first chunk. This will go in the startNumber
+	   attribute of the SegmentTemplate element in the manifest. Default:
+	   0.
+
+       chunk_duration_ms
+	   Duration of each chunk in milliseconds. This will go in the
+	   duration attribute of the SegmentTemplate element in the manifest.
+	   Default: 1000.
+
+       utc_timing_url
+	   URL of the page that will return the UTC timestamp in ISO format.
+	   This will go in the value attribute of the UTCTiming element in the
+	   manifest.  Default: None.
+
+       time_shift_buffer_depth
+	   Smallest time (in seconds) shifting buffer for which any
+	   Representation is guaranteed to be available. This will go in the
+	   timeShiftBufferDepth attribute of the MPD element. Default: 60.
+
+       minimum_update_period
+	   Minimum update period (in seconds) of the manifest. This will go in
+	   the minimumUpdatePeriod attribute of the MPD element. Default: 0.
+
+       Example
+
+	       ffmpeg -f webm_dash_manifest -i video1.webm \
+		      -f webm_dash_manifest -i video2.webm \
+		      -f webm_dash_manifest -i audio1.webm \
+		      -f webm_dash_manifest -i audio2.webm \
+		      -map 0 -map 1 -map 2 -map 3 \
+		      -c copy \
+		      -f webm_dash_manifest \
+		      -adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
+		      manifest.xml
+
+METADATA
+       FFmpeg is able to dump metadata from media files into a simple
+       UTF-8-encoded INI-like text file and then load it back using the
+       metadata muxer/demuxer.
+
+       The file format is as follows:
+
+       1.  A file consists of a header and a number of metadata tags divided
+	   into sections, each on its own line.
+
+       2.  The header is a ;FFMETADATA string, followed by a version number
+	   (now 1).
+
+       3.  Metadata tags are of the form key=value
+
+       4.  Immediately after header follows global metadata
+
+       5.  After global metadata there may be sections with
+	   per-stream/per-chapter metadata.
+
+       6.  A section starts with the section name in uppercase (i.e. STREAM or
+	   CHAPTER) in brackets ([, ]) and ends with next section or end of
+	   file.
+
+       7.  At the beginning of a chapter section there may be an optional
+	   timebase to be used for start/end values. It must be in form
+	   TIMEBASE=num/den, where num and den are integers. If the timebase
+	   is missing then start/end times are assumed to be in nanoseconds.
+
+	   Next a chapter section must contain chapter start and end times in
+	   form START=num, END=num, where num is a positive integer.
+
+       8.  Empty lines and lines starting with ; or # are ignored.
+
+       9.  Metadata keys or values containing special characters (=, ;, #, \
+	   and a newline) must be escaped with a backslash \.
+
+       10. Note that whitespace in metadata (e.g. foo = bar) is considered to
+	   be a part of the tag (in the example above key is foo , value is
+	    bar).
+
+       A ffmetadata file might look like this:
+
+	       ;FFMETADATA1
+	       title=bike\\shed
+	       ;this is a comment
+	       artist=FFmpeg troll team
+
+	       [CHAPTER]
+	       TIMEBASE=1/1000
+	       START=0
+	       #chapter ends at 0:01:00
+	       END=60000
+	       title=chapter \#1
+	       [STREAM]
+	       title=multi\
+	       line
+
+       By using the ffmetadata muxer and demuxer it is possible to extract
+       metadata from an input file to an ffmetadata file, and then transcode
+       the file into an output file with the edited ffmetadata file.
+
+       Extracting an ffmetadata file with ffmpeg goes as follows:
+
+	       ffmpeg -i INPUT -f ffmetadata FFMETADATAFILE
+
+       Reinserting edited metadata information from the FFMETADATAFILE file
+       can be done as:
+
+	       ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -codec copy OUTPUT
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libavformat(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							     FFMPEG-FORMATS(1)
diff --git a/ffmpeg/manpages/ffmpeg-protocols.txt b/ffmpeg/manpages/ffmpeg-protocols.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b1081506f3b76c705265ddc784a24f9d1d66b3db
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-protocols.txt
@@ -0,0 +1,1960 @@
+FFMPEG-PROTOCOLS(1)					   FFMPEG-PROTOCOLS(1)
+
+NAME
+       ffmpeg-protocols - FFmpeg protocols
+
+DESCRIPTION
+       This document describes the input and output protocols provided by the
+       libavformat library.
+
+PROTOCOL OPTIONS
+       The libavformat library provides some generic global options, which can
+       be set on all the protocols. In addition each protocol may support so-
+       called private options, which are specific for that component.
+
+       Options may be set by specifying -option value in the FFmpeg tools, or
+       by setting the value explicitly in the "AVFormatContext" options or
+       using the libavutil/opt.h API for programmatic use.
+
+       The list of supported options follows:
+
+       protocol_whitelist list (input)
+	   Set a ","-separated list of allowed protocols. "ALL" matches all
+	   protocols. Protocols prefixed by "-" are disabled.  All protocols
+	   are allowed by default but protocols used by an another protocol
+	   (nested protocols) are restricted to a per protocol subset.
+
+PROTOCOLS
+       Protocols are configured elements in FFmpeg that enable access to
+       resources that require specific protocols.
+
+       When you configure your FFmpeg build, all the supported protocols are
+       enabled by default. You can list all available ones using the configure
+       option "--list-protocols".
+
+       You can disable all the protocols using the configure option
+       "--disable-protocols", and selectively enable a protocol using the
+       option "--enable-protocol=PROTOCOL", or you can disable a particular
+       protocol using the option "--disable-protocol=PROTOCOL".
+
+       The option "-protocols" of the ff* tools will display the list of
+       supported protocols.
+
+       All protocols accept the following options:
+
+       rw_timeout
+	   Maximum time to wait for (network) read/write operations to
+	   complete, in microseconds.
+
+       A description of the currently available protocols follows.
+
+   amqp
+       Advanced Message Queueing Protocol (AMQP) version 0-9-1 is a broker
+       based publish-subscribe communication protocol.
+
+       FFmpeg must be compiled with --enable-librabbitmq to support AMQP. A
+       separate AMQP broker must also be run. An example open-source AMQP
+       broker is RabbitMQ.
+
+       After starting the broker, an FFmpeg client may stream data to the
+       broker using the command:
+
+	       ffmpeg -re -i input -f mpegts amqp://[[user]:[password]@]hostname[:port][/vhost]
+
+       Where hostname and port (default is 5672) is the address of the broker.
+       The client may also set a user/password for authentication. The default
+       for both fields is "guest". Name of virtual host on broker can be set
+       with vhost. The default value is "/".
+
+       Muliple subscribers may stream from the broker using the command:
+
+	       ffplay amqp://[[user]:[password]@]hostname[:port][/vhost]
+
+       In RabbitMQ all data published to the broker flows through a specific
+       exchange, and each subscribing client has an assigned queue/buffer.
+       When a packet arrives at an exchange, it may be copied to a client's
+       queue depending on the exchange and routing_key fields.
+
+       The following options are supported:
+
+       exchange
+	   Sets the exchange to use on the broker. RabbitMQ has several
+	   predefined exchanges: "amq.direct" is the default exchange, where
+	   the publisher and subscriber must have a matching routing_key;
+	   "amq.fanout" is the same as a broadcast operation (i.e. the data is
+	   forwarded to all queues on the fanout exchange independent of the
+	   routing_key); and "amq.topic" is similar to "amq.direct", but
+	   allows for more complex pattern matching (refer to the RabbitMQ
+	   documentation).
+
+       routing_key
+	   Sets the routing key. The default value is "amqp". The routing key
+	   is used on the "amq.direct" and "amq.topic" exchanges to decide
+	   whether packets are written to the queue of a subscriber.
+
+       pkt_size
+	   Maximum size of each packet sent/received to the broker. Default is
+	   131072.  Minimum is 4096 and max is any large value (representable
+	   by an int). When receiving packets, this sets an internal buffer
+	   size in FFmpeg. It should be equal to or greater than the size of
+	   the published packets to the broker. Otherwise the received message
+	   may be truncated causing decoding errors.
+
+       connection_timeout
+	   The timeout in seconds during the initial connection to the broker.
+	   The default value is rw_timeout, or 5 seconds if rw_timeout is not
+	   set.
+
+       delivery_mode mode
+	   Sets the delivery mode of each message sent to broker.  The
+	   following values are accepted:
+
+	   persistent
+	       Delivery mode set to "persistent" (2). This is the default
+	       value.  Messages may be written to the broker's disk depending
+	       on its setup.
+
+	   non-persistent
+	       Delivery mode set to "non-persistent" (1).  Messages will stay
+	       in broker's memory unless the broker is under memory pressure.
+
+   async
+       Asynchronous data filling wrapper for input stream.
+
+       Fill data in a background thread, to decouple I/O operation from demux
+       thread.
+
+	       async:<URL>
+	       async:http://host/resource
+	       async:cache:http://host/resource
+
+   bluray
+       Read BluRay playlist.
+
+       The accepted options are:
+
+       angle
+	   BluRay angle
+
+       chapter
+	   Start chapter (1...N)
+
+       playlist
+	   Playlist to read (BDMV/PLAYLIST/?????.mpls)
+
+       Examples:
+
+       Read longest playlist from BluRay mounted to /mnt/bluray:
+
+	       bluray:/mnt/bluray
+
+       Read angle 2 of playlist 4 from BluRay mounted to /mnt/bluray, start
+       from chapter 2:
+
+	       -playlist 4 -angle 2 -chapter 2 bluray:/mnt/bluray
+
+   cache
+       Caching wrapper for input stream.
+
+       Cache the input stream to temporary file. It brings seeking capability
+       to live streams.
+
+       The accepted options are:
+
+       read_ahead_limit
+	   Amount in bytes that may be read ahead when seeking isn't
+	   supported. Range is -1 to INT_MAX.  -1 for unlimited. Default is
+	   65536.
+
+       URL Syntax is
+
+	       cache:<URL>
+
+   concat
+       Physical concatenation protocol.
+
+       Read and seek from many resources in sequence as if they were a unique
+       resource.
+
+       A URL accepted by this protocol has the syntax:
+
+	       concat:<URL1>|<URL2>|...|<URLN>
+
+       where URL1, URL2, ..., URLN are the urls of the resource to be
+       concatenated, each one possibly specifying a distinct protocol.
+
+       For example to read a sequence of files split1.mpeg, split2.mpeg,
+       split3.mpeg with ffplay use the command:
+
+	       ffplay concat:split1.mpeg\|split2.mpeg\|split3.mpeg
+
+       Note that you may need to escape the character "|" which is special for
+       many shells.
+
+   concatf
+       Physical concatenation protocol using a line break delimited list of
+       resources.
+
+       Read and seek from many resources in sequence as if they were a unique
+       resource.
+
+       A URL accepted by this protocol has the syntax:
+
+	       concatf:<URL>
+
+       where URL is the url containing a line break delimited list of
+       resources to be concatenated, each one possibly specifying a distinct
+       protocol. Special characters must be escaped with backslash or single
+       quotes. See the "Quoting and escaping" section in the ffmpeg-utils(1)
+       manual.
+
+       For example to read a sequence of files split1.mpeg, split2.mpeg,
+       split3.mpeg listed in separate lines within a file split.txt with
+       ffplay use the command:
+
+	       ffplay concatf:split.txt
+
+       Where split.txt contains the lines:
+
+	       split1.mpeg
+	       split2.mpeg
+	       split3.mpeg
+
+   crypto
+       AES-encrypted stream reading protocol.
+
+       The accepted options are:
+
+       key Set the AES decryption key binary block from given hexadecimal
+	   representation.
+
+       iv  Set the AES decryption initialization vector binary block from
+	   given hexadecimal representation.
+
+       Accepted URL formats:
+
+	       crypto:<URL>
+	       crypto+<URL>
+
+   data
+       Data in-line in the URI. See
+       <http://en.wikipedia.org/wiki/Data_URI_scheme>.
+
+       For example, to convert a GIF file given inline with ffmpeg:
+
+	       ffmpeg -i "data:image/gif;base64,R0lGODdhCAAIAMIEAAAAAAAA//8AAP//AP///////////////ywAAAAACAAIAAADF0gEDLojDgdGiJdJqUX02iB4E8Q9jUMkADs=" smiley.png
+
+   fd
+       File descriptor access protocol.
+
+       The accepted syntax is:
+
+	       fd: -fd <file_descriptor>
+
+       If fd is not specified, by default the stdout file descriptor will be
+       used for writing, stdin for reading. Unlike the pipe protocol, fd
+       protocol has seek support if it corresponding to a regular file. fd
+       protocol doesn't support pass file descriptor via URL for security.
+
+       This protocol accepts the following options:
+
+       blocksize
+	   Set I/O operation maximum block size, in bytes. Default value is
+	   "INT_MAX", which results in not limiting the requested block size.
+	   Setting this value reasonably low improves user termination request
+	   reaction time, which is valuable if data transmission is slow.
+
+       fd  Set file descriptor.
+
+   file
+       File access protocol.
+
+       Read from or write to a file.
+
+       A file URL can have the form:
+
+	       file:<filename>
+
+       where filename is the path of the file to read.
+
+       An URL that does not have a protocol prefix will be assumed to be a
+       file URL. Depending on the build, an URL that looks like a Windows path
+       with the drive letter at the beginning will also be assumed to be a
+       file URL (usually not the case in builds for unix-like systems).
+
+       For example to read from a file input.mpeg with ffmpeg use the command:
+
+	       ffmpeg -i file:input.mpeg output.mpeg
+
+       This protocol accepts the following options:
+
+       truncate
+	   Truncate existing files on write, if set to 1. A value of 0
+	   prevents truncating. Default value is 1.
+
+       blocksize
+	   Set I/O operation maximum block size, in bytes. Default value is
+	   "INT_MAX", which results in not limiting the requested block size.
+	   Setting this value reasonably low improves user termination request
+	   reaction time, which is valuable for files on slow medium.
+
+       follow
+	   If set to 1, the protocol will retry reading at the end of the
+	   file, allowing reading files that still are being written. In order
+	   for this to terminate, you either need to use the rw_timeout
+	   option, or use the interrupt callback (for API users).
+
+       seekable
+	   Controls if seekability is advertised on the file. 0 means non-
+	   seekable, -1 means auto (seekable for normal files, non-seekable
+	   for named pipes).
+
+	   Many demuxers handle seekable and non-seekable resources
+	   differently, overriding this might speed up opening certain files
+	   at the cost of losing some features (e.g. accurate seeking).
+
+   ftp
+       FTP (File Transfer Protocol).
+
+       Read from or write to remote resources using FTP protocol.
+
+       Following syntax is required.
+
+	       ftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg
+
+       This protocol accepts the following options.
+
+       timeout
+	   Set timeout in microseconds of socket I/O operations used by the
+	   underlying low level operation. By default it is set to -1, which
+	   means that the timeout is not specified.
+
+       ftp-user
+	   Set a user to be used for authenticating to the FTP server. This is
+	   overridden by the user in the FTP URL.
+
+       ftp-password
+	   Set a password to be used for authenticating to the FTP server.
+	   This is overridden by the password in the FTP URL, or by ftp-
+	   anonymous-password if no user is set.
+
+       ftp-anonymous-password
+	   Password used when login as anonymous user. Typically an e-mail
+	   address should be used.
+
+       ftp-write-seekable
+	   Control seekability of connection during encoding. If set to 1 the
+	   resource is supposed to be seekable, if set to 0 it is assumed not
+	   to be seekable. Default value is 0.
+
+       NOTE: Protocol can be used as output, but it is recommended to not do
+       it, unless special care is taken (tests, customized server
+       configuration etc.). Different FTP servers behave in different way
+       during seek operation. ff* tools may produce incomplete content due to
+       server limitations.
+
+   gopher
+       Gopher protocol.
+
+   gophers
+       Gophers protocol.
+
+       The Gopher protocol with TLS encapsulation.
+
+   hls
+       Read Apple HTTP Live Streaming compliant segmented stream as a uniform
+       one. The M3U8 playlists describing the segments can be remote HTTP
+       resources or local files, accessed using the standard file protocol.
+       The nested protocol is declared by specifying "+proto" after the hls
+       URI scheme name, where proto is either "file" or "http".
+
+	       hls+http://host/path/to/remote/resource.m3u8
+	       hls+file://path/to/local/resource.m3u8
+
+       Using this protocol is discouraged - the hls demuxer should work just
+       as well (if not, please report the issues) and is more complete.  To
+       use the hls demuxer instead, simply use the direct URLs to the m3u8
+       files.
+
+   http
+       HTTP (Hyper Text Transfer Protocol).
+
+       This protocol accepts the following options:
+
+       seekable
+	   Control seekability of connection. If set to 1 the resource is
+	   supposed to be seekable, if set to 0 it is assumed not to be
+	   seekable, if set to -1 it will try to autodetect if it is seekable.
+	   Default value is -1.
+
+       chunked_post
+	   If set to 1 use chunked Transfer-Encoding for posts, default is 1.
+
+       content_type
+	   Set a specific content type for the POST messages or for listen
+	   mode.
+
+       http_proxy
+	   set HTTP proxy to tunnel through e.g. http://example.com:1234
+
+       headers
+	   Set custom HTTP headers, can override built in default headers. The
+	   value must be a string encoding the headers.
+
+       multiple_requests
+	   Use persistent connections if set to 1, default is 0.
+
+       post_data
+	   Set custom HTTP post data.
+
+       referer
+	   Set the Referer header. Include 'Referer: URL' header in HTTP
+	   request.
+
+       user_agent
+	   Override the User-Agent header. If not specified the protocol will
+	   use a string describing the libavformat build. ("Lavf/<version>")
+
+       reconnect_at_eof
+	   If set then eof is treated like an error and causes reconnection,
+	   this is useful for live / endless streams.
+
+       reconnect_streamed
+	   If set then even streamed/non seekable streams will be reconnected
+	   on errors.
+
+       reconnect_on_network_error
+	   Reconnect automatically in case of TCP/TLS errors during connect.
+
+       reconnect_on_http_error
+	   A comma separated list of HTTP status codes to reconnect on. The
+	   list can include specific status codes (e.g. '503') or the strings
+	   '4xx' / '5xx'.
+
+       reconnect_delay_max
+	   Sets the maximum delay in seconds after which to give up
+	   reconnecting
+
+       mime_type
+	   Export the MIME type.
+
+       http_version
+	   Exports the HTTP response version number. Usually "1.0" or "1.1".
+
+       icy If set to 1 request ICY (SHOUTcast) metadata from the server. If
+	   the server supports this, the metadata has to be retrieved by the
+	   application by reading the icy_metadata_headers and
+	   icy_metadata_packet options.  The default is 1.
+
+       icy_metadata_headers
+	   If the server supports ICY metadata, this contains the ICY-specific
+	   HTTP reply headers, separated by newline characters.
+
+       icy_metadata_packet
+	   If the server supports ICY metadata, and icy was set to 1, this
+	   contains the last non-empty metadata packet sent by the server. It
+	   should be polled in regular intervals by applications interested in
+	   mid-stream metadata updates.
+
+       cookies
+	   Set the cookies to be sent in future requests. The format of each
+	   cookie is the same as the value of a Set-Cookie HTTP response
+	   field. Multiple cookies can be delimited by a newline character.
+
+       offset
+	   Set initial byte offset.
+
+       end_offset
+	   Try to limit the request to bytes preceding this offset.
+
+       method
+	   When used as a client option it sets the HTTP method for the
+	   request.
+
+	   When used as a server option it sets the HTTP method that is going
+	   to be expected from the client(s).  If the expected and the
+	   received HTTP method do not match the client will be given a Bad
+	   Request response.  When unset the HTTP method is not checked for
+	   now. This will be replaced by autodetection in the future.
+
+       listen
+	   If set to 1 enables experimental HTTP server. This can be used to
+	   send data when used as an output option, or read data from a client
+	   with HTTP POST when used as an input option.  If set to 2 enables
+	   experimental multi-client HTTP server. This is not yet implemented
+	   in ffmpeg.c and thus must not be used as a command line option.
+
+		   # Server side (sending):
+		   ffmpeg -i somefile.ogg -c copy -listen 1 -f ogg http://<server>:<port>
+
+		   # Client side (receiving):
+		   ffmpeg -i http://<server>:<port> -c copy somefile.ogg
+
+		   # Client can also be done with wget:
+		   wget http://<server>:<port> -O somefile.ogg
+
+		   # Server side (receiving):
+		   ffmpeg -listen 1 -i http://<server>:<port> -c copy somefile.ogg
+
+		   # Client side (sending):
+		   ffmpeg -i somefile.ogg -chunked_post 0 -c copy -f ogg http://<server>:<port>
+
+		   # Client can also be done with wget:
+		   wget --post-file=somefile.ogg http://<server>:<port>
+
+       send_expect_100
+	   Send an Expect: 100-continue header for POST. If set to 1 it will
+	   send, if set to 0 it won't, if set to -1 it will try to send if it
+	   is applicable. Default value is -1.
+
+       auth_type
+	   Set HTTP authentication type. No option for Digest, since this
+	   method requires getting nonce parameters from the server first and
+	   can't be used straight away like Basic.
+
+	   none
+	       Choose the HTTP authentication type automatically. This is the
+	       default.
+
+	   basic
+	       Choose the HTTP basic authentication.
+
+	       Basic authentication sends a Base64-encoded string that
+	       contains a user name and password for the client. Base64 is not
+	       a form of encryption and should be considered the same as
+	       sending the user name and password in clear text (Base64 is a
+	       reversible encoding).  If a resource needs to be protected,
+	       strongly consider using an authentication scheme other than
+	       basic authentication. HTTPS/TLS should be used with basic
+	       authentication.	Without these additional security
+	       enhancements, basic authentication should not be used to
+	       protect sensitive or valuable information.
+
+       HTTP Cookies
+
+       Some HTTP requests will be denied unless cookie values are passed in
+       with the request. The cookies option allows these cookies to be
+       specified. At the very least, each cookie must specify a value along
+       with a path and domain.	HTTP requests that match both the domain and
+       path will automatically include the cookie value in the HTTP Cookie
+       header field. Multiple cookies can be delimited by a newline.
+
+       The required syntax to play a stream specifying a cookie is:
+
+	       ffplay -cookies "nlqptid=nltid=tsn; path=/; domain=somedomain.com;" http://somedomain.com/somestream.m3u8
+
+   Icecast
+       Icecast protocol (stream to Icecast servers)
+
+       This protocol accepts the following options:
+
+       ice_genre
+	   Set the stream genre.
+
+       ice_name
+	   Set the stream name.
+
+       ice_description
+	   Set the stream description.
+
+       ice_url
+	   Set the stream website URL.
+
+       ice_public
+	   Set if the stream should be public.	The default is 0 (not public).
+
+       user_agent
+	   Override the User-Agent header. If not specified a string of the
+	   form "Lavf/<version>" will be used.
+
+       password
+	   Set the Icecast mountpoint password.
+
+       content_type
+	   Set the stream content type. This must be set if it is different
+	   from audio/mpeg.
+
+       legacy_icecast
+	   This enables support for Icecast versions < 2.4.0, that do not
+	   support the HTTP PUT method but the SOURCE method.
+
+       tls Establish a TLS (HTTPS) connection to Icecast.
+
+	       icecast://[<username>[:<password>]@]<server>:<port>/<mountpoint>
+
+   ipfs
+       InterPlanetary File System (IPFS) protocol support. One can access
+       files stored on the IPFS network through so-called gateways. These are
+       http(s) endpoints.  This protocol wraps the IPFS native protocols
+       (ipfs:// and ipns://) to be sent to such a gateway. Users can (and
+       should) host their own node which means this protocol will use one's
+       local gateway to access files on the IPFS network.
+
+       This protocol accepts the following options:
+
+       gateway
+	   Defines the gateway to use. When not set, the protocol will first
+	   try locating the local gateway by looking at $IPFS_GATEWAY,
+	   $IPFS_PATH and "$HOME/.ipfs/", in that order.
+
+       One can use this protocol in 2 ways. Using IPFS:
+
+	       ffplay ipfs://<hash>
+
+       Or the IPNS protocol (IPNS is mutable IPFS):
+
+	       ffplay ipns://<hash>
+
+   mmst
+       MMS (Microsoft Media Server) protocol over TCP.
+
+   mmsh
+       MMS (Microsoft Media Server) protocol over HTTP.
+
+       The required syntax is:
+
+	       mmsh://<server>[:<port>][/<app>][/<playpath>]
+
+   md5
+       MD5 output protocol.
+
+       Computes the MD5 hash of the data to be written, and on close writes
+       this to the designated output or stdout if none is specified. It can be
+       used to test muxers without writing an actual file.
+
+       Some examples follow.
+
+	       # Write the MD5 hash of the encoded AVI file to the file output.avi.md5.
+	       ffmpeg -i input.flv -f avi -y md5:output.avi.md5
+
+	       # Write the MD5 hash of the encoded AVI file to stdout.
+	       ffmpeg -i input.flv -f avi -y md5:
+
+       Note that some formats (typically MOV) require the output protocol to
+       be seekable, so they will fail with the MD5 output protocol.
+
+   pipe
+       UNIX pipe access protocol.
+
+       Read and write from UNIX pipes.
+
+       The accepted syntax is:
+
+	       pipe:[<number>]
+
+       If fd isn't specified, number is the number corresponding to the file
+       descriptor of the pipe (e.g. 0 for stdin, 1 for stdout, 2 for stderr).
+       If number is not specified, by default the stdout file descriptor will
+       be used for writing, stdin for reading.
+
+       For example to read from stdin with ffmpeg:
+
+	       cat test.wav | ffmpeg -i pipe:0
+	       # ...this is the same as...
+	       cat test.wav | ffmpeg -i pipe:
+
+       For writing to stdout with ffmpeg:
+
+	       ffmpeg -i test.wav -f avi pipe:1 | cat > test.avi
+	       # ...this is the same as...
+	       ffmpeg -i test.wav -f avi pipe: | cat > test.avi
+
+       This protocol accepts the following options:
+
+       blocksize
+	   Set I/O operation maximum block size, in bytes. Default value is
+	   "INT_MAX", which results in not limiting the requested block size.
+	   Setting this value reasonably low improves user termination request
+	   reaction time, which is valuable if data transmission is slow.
+
+       fd  Set file descriptor.
+
+       Note that some formats (typically MOV), require the output protocol to
+       be seekable, so they will fail with the pipe output protocol.
+
+   prompeg
+       Pro-MPEG Code of Practice #3 Release 2 FEC protocol.
+
+       The Pro-MPEG CoP#3 FEC is a 2D parity-check forward error correction
+       mechanism for MPEG-2 Transport Streams sent over RTP.
+
+       This protocol must be used in conjunction with the "rtp_mpegts" muxer
+       and the "rtp" protocol.
+
+       The required syntax is:
+
+	       -f rtp_mpegts -fec prompeg=<option>=<val>... rtp://<hostname>:<port>
+
+       The destination UDP ports are "port + 2" for the column FEC stream and
+       "port + 4" for the row FEC stream.
+
+       This protocol accepts the following options:
+
+       l=n The number of columns (4-20, LxD <= 100)
+
+       d=n The number of rows (4-20, LxD <= 100)
+
+       Example usage:
+
+	       -f rtp_mpegts -fec prompeg=l=8:d=4 rtp://<hostname>:<port>
+
+   rist
+       Reliable Internet Streaming Transport protocol
+
+       The accepted options are:
+
+       rist_profile
+	   Supported values:
+
+	   simple
+	   main
+	       This one is default.
+
+	   advanced
+       buffer_size
+	   Set internal RIST buffer size in milliseconds for retransmission of
+	   data.  Default value is 0 which means the librist default (1 sec).
+	   Maximum value is 30 seconds.
+
+       fifo_size
+	   Size of the librist receiver output fifo in number of packets. This
+	   must be a power of 2.  Defaults to 8192 (vs the librist default of
+	   1024).
+
+       overrun_nonfatal=1|0
+	   Survive in case of librist fifo buffer overrun. Default value is 0.
+
+       pkt_size
+	   Set maximum packet size for sending data. 1316 by default.
+
+       log_level
+	   Set loglevel for RIST logging messages. You only need to set this
+	   if you explicitly want to enable debug level messages or packet
+	   loss simulation, otherwise the regular loglevel is respected.
+
+       secret
+	   Set override of encryption secret, by default is unset.
+
+       encryption
+	   Set encryption type, by default is disabled.  Acceptable values are
+	   128 and 256.
+
+   rtmp
+       Real-Time Messaging Protocol.
+
+       The Real-Time Messaging Protocol (RTMP) is used for streaming
+       multimedia content across a TCP/IP network.
+
+       The required syntax is:
+
+	       rtmp://[<username>:<password>@]<server>[:<port>][/<app>][/<instance>][/<playpath>]
+
+       The accepted parameters are:
+
+       username
+	   An optional username (mostly for publishing).
+
+       password
+	   An optional password (mostly for publishing).
+
+       server
+	   The address of the RTMP server.
+
+       port
+	   The number of the TCP port to use (by default is 1935).
+
+       app It is the name of the application to access. It usually corresponds
+	   to the path where the application is installed on the RTMP server
+	   (e.g. /ondemand/, /flash/live/, etc.). You can override the value
+	   parsed from the URI through the "rtmp_app" option, too.
+
+       playpath
+	   It is the path or name of the resource to play with reference to
+	   the application specified in app, may be prefixed by "mp4:". You
+	   can override the value parsed from the URI through the
+	   "rtmp_playpath" option, too.
+
+       listen
+	   Act as a server, listening for an incoming connection.
+
+       timeout
+	   Maximum time to wait for the incoming connection. Implies listen.
+
+       Additionally, the following parameters can be set via command line
+       options (or in code via "AVOption"s):
+
+       rtmp_app
+	   Name of application to connect on the RTMP server. This option
+	   overrides the parameter specified in the URI.
+
+       rtmp_buffer
+	   Set the client buffer time in milliseconds. The default is 3000.
+
+       rtmp_conn
+	   Extra arbitrary AMF connection parameters, parsed from a string,
+	   e.g. like "B:1 S:authMe O:1 NN:code:1.23 NS:flag:ok O:0".  Each
+	   value is prefixed by a single character denoting the type, B for
+	   Boolean, N for number, S for string, O for object, or Z for null,
+	   followed by a colon. For Booleans the data must be either 0 or 1
+	   for FALSE or TRUE, respectively.  Likewise for Objects the data
+	   must be 0 or 1 to end or begin an object, respectively. Data items
+	   in subobjects may be named, by prefixing the type with 'N' and
+	   specifying the name before the value (i.e. "NB:myFlag:1"). This
+	   option may be used multiple times to construct arbitrary AMF
+	   sequences.
+
+       rtmp_enhanced_codecs
+	   Specify the list of codecs the client advertises to support in an
+	   enhanced RTMP stream. This option should be set to a comma
+	   separated list of fourcc values, like "hvc1,av01,vp09" for multiple
+	   codecs or "hvc1" for only one codec. The specified list will be
+	   presented in the "fourCcLive" property of the Connect Command
+	   Message.
+
+       rtmp_flashver
+	   Version of the Flash plugin used to run the SWF player. The default
+	   is LNX 9,0,124,2. (When publishing, the default is FMLE/3.0
+	   (compatible; <libavformat version>).)
+
+       rtmp_flush_interval
+	   Number of packets flushed in the same request (RTMPT only). The
+	   default is 10.
+
+       rtmp_live
+	   Specify that the media is a live stream. No resuming or seeking in
+	   live streams is possible. The default value is "any", which means
+	   the subscriber first tries to play the live stream specified in the
+	   playpath. If a live stream of that name is not found, it plays the
+	   recorded stream. The other possible values are "live" and
+	   "recorded".
+
+       rtmp_pageurl
+	   URL of the web page in which the media was embedded. By default no
+	   value will be sent.
+
+       rtmp_playpath
+	   Stream identifier to play or to publish. This option overrides the
+	   parameter specified in the URI.
+
+       rtmp_subscribe
+	   Name of live stream to subscribe to. By default no value will be
+	   sent.  It is only sent if the option is specified or if rtmp_live
+	   is set to live.
+
+       rtmp_swfhash
+	   SHA256 hash of the decompressed SWF file (32 bytes).
+
+       rtmp_swfsize
+	   Size of the decompressed SWF file, required for SWFVerification.
+
+       rtmp_swfurl
+	   URL of the SWF player for the media. By default no value will be
+	   sent.
+
+       rtmp_swfverify
+	   URL to player swf file, compute hash/size automatically.
+
+       rtmp_tcurl
+	   URL of the target stream. Defaults to proto://host[:port]/app.
+
+       tcp_nodelay=1|0
+	   Set TCP_NODELAY to disable Nagle's algorithm. Default value is 0.
+
+	   Remark: Writing to the socket is currently not optimized to
+	   minimize system calls and reduces the efficiency / effect of
+	   TCP_NODELAY.
+
+       For example to read with ffplay a multimedia resource named "sample"
+       from the application "vod" from an RTMP server "myserver":
+
+	       ffplay rtmp://myserver/vod/sample
+
+       To publish to a password protected server, passing the playpath and app
+       names separately:
+
+	       ffmpeg -re -i <input> -f flv -rtmp_playpath some/long/path -rtmp_app long/app/name rtmp://username:password@myserver/
+
+   rtmpe
+       Encrypted Real-Time Messaging Protocol.
+
+       The Encrypted Real-Time Messaging Protocol (RTMPE) is used for
+       streaming multimedia content within standard cryptographic primitives,
+       consisting of Diffie-Hellman key exchange and HMACSHA256, generating a
+       pair of RC4 keys.
+
+   rtmps
+       Real-Time Messaging Protocol over a secure SSL connection.
+
+       The Real-Time Messaging Protocol (RTMPS) is used for streaming
+       multimedia content across an encrypted connection.
+
+   rtmpt
+       Real-Time Messaging Protocol tunneled through HTTP.
+
+       The Real-Time Messaging Protocol tunneled through HTTP (RTMPT) is used
+       for streaming multimedia content within HTTP requests to traverse
+       firewalls.
+
+   rtmpte
+       Encrypted Real-Time Messaging Protocol tunneled through HTTP.
+
+       The Encrypted Real-Time Messaging Protocol tunneled through HTTP
+       (RTMPTE) is used for streaming multimedia content within HTTP requests
+       to traverse firewalls.
+
+   rtmpts
+       Real-Time Messaging Protocol tunneled through HTTPS.
+
+       The Real-Time Messaging Protocol tunneled through HTTPS (RTMPTS) is
+       used for streaming multimedia content within HTTPS requests to traverse
+       firewalls.
+
+   libsmbclient
+       libsmbclient permits one to manipulate CIFS/SMB network resources.
+
+       Following syntax is required.
+
+	       smb://[[domain:]user[:password@]]server[/share[/path[/file]]]
+
+       This protocol accepts the following options.
+
+       timeout
+	   Set timeout in milliseconds of socket I/O operations used by the
+	   underlying low level operation. By default it is set to -1, which
+	   means that the timeout is not specified.
+
+       truncate
+	   Truncate existing files on write, if set to 1. A value of 0
+	   prevents truncating. Default value is 1.
+
+       workgroup
+	   Set the workgroup used for making connections. By default workgroup
+	   is not specified.
+
+       For more information see: <http://www.samba.org/>.
+
+   libssh
+       Secure File Transfer Protocol via libssh
+
+       Read from or write to remote resources using SFTP protocol.
+
+       Following syntax is required.
+
+	       sftp://[user[:password]@]server[:port]/path/to/remote/resource.mpeg
+
+       This protocol accepts the following options.
+
+       timeout
+	   Set timeout of socket I/O operations used by the underlying low
+	   level operation. By default it is set to -1, which means that the
+	   timeout is not specified.
+
+       truncate
+	   Truncate existing files on write, if set to 1. A value of 0
+	   prevents truncating. Default value is 1.
+
+       private_key
+	   Specify the path of the file containing private key to use during
+	   authorization.  By default libssh searches for keys in the ~/.ssh/
+	   directory.
+
+       Example: Play a file stored on remote server.
+
+	       ffplay sftp://user:password@server_address:22/home/user/resource.mpeg
+
+   librtmp rtmp, rtmpe, rtmps, rtmpt, rtmpte
+       Real-Time Messaging Protocol and its variants supported through
+       librtmp.
+
+       Requires the presence of the librtmp headers and library during
+       configuration. You need to explicitly configure the build with
+       "--enable-librtmp". If enabled this will replace the native RTMP
+       protocol.
+
+       This protocol provides most client functions and a few server functions
+       needed to support RTMP, RTMP tunneled in HTTP (RTMPT), encrypted RTMP
+       (RTMPE), RTMP over SSL/TLS (RTMPS) and tunneled variants of these
+       encrypted types (RTMPTE, RTMPTS).
+
+       The required syntax is:
+
+	       <rtmp_proto>://<server>[:<port>][/<app>][/<playpath>] <options>
+
+       where rtmp_proto is one of the strings "rtmp", "rtmpt", "rtmpe",
+       "rtmps", "rtmpte", "rtmpts" corresponding to each RTMP variant, and
+       server, port, app and playpath have the same meaning as specified for
+       the RTMP native protocol.  options contains a list of space-separated
+       options of the form key=val.
+
+       See the librtmp manual page (man 3 librtmp) for more information.
+
+       For example, to stream a file in real-time to an RTMP server using
+       ffmpeg:
+
+	       ffmpeg -re -i myfile -f flv rtmp://myserver/live/mystream
+
+       To play the same stream using ffplay:
+
+	       ffplay "rtmp://myserver/live/mystream live=1"
+
+   rtp
+       Real-time Transport Protocol.
+
+       The required syntax for an RTP URL is:
+       rtp://hostname[:port][?option=val...]
+
+       port specifies the RTP port to use.
+
+       The following URL options are supported:
+
+       ttl=n
+	   Set the TTL (Time-To-Live) value (for multicast only).
+
+       rtcpport=n
+	   Set the remote RTCP port to n.
+
+       localrtpport=n
+	   Set the local RTP port to n.
+
+       localrtcpport=n'
+	   Set the local RTCP port to n.
+
+       pkt_size=n
+	   Set max packet size (in bytes) to n.
+
+       buffer_size=size
+	   Set the maximum UDP socket buffer size in bytes.
+
+       connect=0|1
+	   Do a "connect()" on the UDP socket (if set to 1) or not (if set to
+	   0).
+
+       sources=ip[,ip]
+	   List allowed source IP addresses.
+
+       block=ip[,ip]
+	   List disallowed (blocked) source IP addresses.
+
+       write_to_source=0|1
+	   Send packets to the source address of the latest received packet
+	   (if set to 1) or to a default remote address (if set to 0).
+
+       localport=n
+	   Set the local RTP port to n.
+
+       localaddr=addr
+	   Local IP address of a network interface used for sending packets or
+	   joining multicast groups.
+
+       timeout=n
+	   Set timeout (in microseconds) of socket I/O operations to n.
+
+	   This is a deprecated option. Instead, localrtpport should be used.
+
+       Important notes:
+
+       1.  If rtcpport is not set the RTCP port will be set to the RTP port
+	   value plus 1.
+
+       2.  If localrtpport (the local RTP port) is not set any available port
+	   will be used for the local RTP and RTCP ports.
+
+       3.  If localrtcpport (the local RTCP port) is not set it will be set to
+	   the local RTP port value plus 1.
+
+   rtsp
+       Real-Time Streaming Protocol.
+
+       RTSP is not technically a protocol handler in libavformat, it is a
+       demuxer and muxer. The demuxer supports both normal RTSP (with data
+       transferred over RTP; this is used by e.g. Apple and Microsoft) and
+       Real-RTSP (with data transferred over RDT).
+
+       The muxer can be used to send a stream using RTSP ANNOUNCE to a server
+       supporting it (currently Darwin Streaming Server and Mischa
+       Spiegelmock's <https://github.com/revmischa/rtsp-server>).
+
+       The required syntax for a RTSP url is:
+
+	       rtsp://<hostname>[:<port>]/<path>
+
+       Options can be set on the ffmpeg/ffplay command line, or set in code
+       via "AVOption"s or in "avformat_open_input".
+
+       Muxer
+
+       The following options are supported.
+
+       rtsp_transport
+	   Set RTSP transport protocols.
+
+	   It accepts the following values:
+
+	   udp Use UDP as lower transport protocol.
+
+	   tcp Use TCP (interleaving within the RTSP control channel) as lower
+	       transport protocol.
+
+	   Default value is 0.
+
+       rtsp_flags
+	   Set RTSP flags.
+
+	   The following values are accepted:
+
+	   latm
+	       Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC.
+
+	   rfc2190
+	       Use RFC 2190 packetization instead of RFC 4629 for H.263.
+
+	   skip_rtcp
+	       Don't send RTCP sender reports.
+
+	   h264_mode0
+	       Use mode 0 for H.264 in RTP.
+
+	   send_bye
+	       Send RTCP BYE packets when finishing.
+
+	   Default value is 0.
+
+       min_port
+	   Set minimum local UDP port. Default value is 5000.
+
+       max_port
+	   Set maximum local UDP port. Default value is 65000.
+
+       buffer_size
+	   Set the maximum socket buffer size in bytes.
+
+       pkt_size
+	   Set max send packet size (in bytes). Default value is 1472.
+
+       Demuxer
+
+       The following options are supported.
+
+       initial_pause
+	   Do not start playing the stream immediately if set to 1. Default
+	   value is 0.
+
+       rtsp_transport
+	   Set RTSP transport protocols.
+
+	   It accepts the following values:
+
+	   udp Use UDP as lower transport protocol.
+
+	   tcp Use TCP (interleaving within the RTSP control channel) as lower
+	       transport protocol.
+
+	   udp_multicast
+	       Use UDP multicast as lower transport protocol.
+
+	   http
+	       Use HTTP tunneling as lower transport protocol, which is useful
+	       for passing proxies.
+
+	   https
+	       Use HTTPs tunneling as lower transport protocol, which is
+	       useful for passing proxies and widely used for security
+	       consideration.
+
+	   Multiple lower transport protocols may be specified, in that case
+	   they are tried one at a time (if the setup of one fails, the next
+	   one is tried).  For the muxer, only the tcp and udp options are
+	   supported.
+
+       rtsp_flags
+	   Set RTSP flags.
+
+	   The following values are accepted:
+
+	   filter_src
+	       Accept packets only from negotiated peer address and port.
+
+	   listen
+	       Act as a server, listening for an incoming connection.
+
+	   prefer_tcp
+	       Try TCP for RTP transport first, if TCP is available as RTSP
+	       RTP transport.
+
+	   satip_raw
+	       Export raw MPEG-TS stream instead of demuxing. The flag will
+	       simply write out the raw stream, with the original PAT/PMT/PIDs
+	       intact.
+
+	   Default value is none.
+
+       allowed_media_types
+	   Set media types to accept from the server.
+
+	   The following flags are accepted:
+
+	   video
+	   audio
+	   data
+	   subtitle
+
+	   By default it accepts all media types.
+
+       min_port
+	   Set minimum local UDP port. Default value is 5000.
+
+       max_port
+	   Set maximum local UDP port. Default value is 65000.
+
+       listen_timeout
+	   Set maximum timeout (in seconds) to establish an initial
+	   connection. Setting listen_timeout > 0 sets rtsp_flags to listen.
+	   Default is -1 which means an infinite timeout when listen mode is
+	   set.
+
+       reorder_queue_size
+	   Set number of packets to buffer for handling of reordered packets.
+
+       timeout
+	   Set socket TCP I/O timeout in microseconds.
+
+       user_agent
+	   Override User-Agent header. If not specified, it defaults to the
+	   libavformat identifier string.
+
+       buffer_size
+	   Set the maximum socket buffer size in bytes.
+
+       When receiving data over UDP, the demuxer tries to reorder received
+       packets (since they may arrive out of order, or packets may get lost
+       totally). This can be disabled by setting the maximum demuxing delay to
+       zero (via the "max_delay" field of AVFormatContext).
+
+       When watching multi-bitrate Real-RTSP streams with ffplay, the streams
+       to display can be chosen with "-vst" n and "-ast" n for video and audio
+       respectively, and can be switched on the fly by pressing "v" and "a".
+
+       Examples
+
+       The following examples all make use of the ffplay and ffmpeg tools.
+
+       o   Watch a stream over UDP, with a max reordering delay of 0.5
+	   seconds:
+
+		   ffplay -max_delay 500000 -rtsp_transport udp rtsp://server/video.mp4
+
+       o   Watch a stream tunneled over HTTP:
+
+		   ffplay -rtsp_transport http rtsp://server/video.mp4
+
+       o   Send a stream in realtime to a RTSP server, for others to watch:
+
+		   ffmpeg -re -i <input> -f rtsp -muxdelay 0.1 rtsp://server/live.sdp
+
+       o   Receive a stream in realtime:
+
+		   ffmpeg -rtsp_flags listen -i rtsp://ownaddress/live.sdp <output>
+
+   sap
+       Session Announcement Protocol (RFC 2974). This is not technically a
+       protocol handler in libavformat, it is a muxer and demuxer.  It is used
+       for signalling of RTP streams, by announcing the SDP for the streams
+       regularly on a separate port.
+
+       Muxer
+
+       The syntax for a SAP url given to the muxer is:
+
+	       sap://<destination>[:<port>][?<options>]
+
+       The RTP packets are sent to destination on port port, or to port 5004
+       if no port is specified.  options is a "&"-separated list. The
+       following options are supported:
+
+       announce_addr=address
+	   Specify the destination IP address for sending the announcements
+	   to.	If omitted, the announcements are sent to the commonly used
+	   SAP announcement multicast address 224.2.127.254 (sap.mcast.net),
+	   or ff0e::2:7ffe if destination is an IPv6 address.
+
+       announce_port=port
+	   Specify the port to send the announcements on, defaults to 9875 if
+	   not specified.
+
+       ttl=ttl
+	   Specify the time to live value for the announcements and RTP
+	   packets, defaults to 255.
+
+       same_port=0|1
+	   If set to 1, send all RTP streams on the same port pair. If zero
+	   (the default), all streams are sent on unique ports, with each
+	   stream on a port 2 numbers higher than the previous.  VLC/Live555
+	   requires this to be set to 1, to be able to receive the stream.
+	   The RTP stack in libavformat for receiving requires all streams to
+	   be sent on unique ports.
+
+       Example command lines follow.
+
+       To broadcast a stream on the local subnet, for watching in VLC:
+
+	       ffmpeg -re -i <input> -f sap sap://224.0.0.255?same_port=1
+
+       Similarly, for watching in ffplay:
+
+	       ffmpeg -re -i <input> -f sap sap://224.0.0.255
+
+       And for watching in ffplay, over IPv6:
+
+	       ffmpeg -re -i <input> -f sap sap://[ff0e::1:2:3:4]
+
+       Demuxer
+
+       The syntax for a SAP url given to the demuxer is:
+
+	       sap://[<address>][:<port>]
+
+       address is the multicast address to listen for announcements on, if
+       omitted, the default 224.2.127.254 (sap.mcast.net) is used. port is the
+       port that is listened on, 9875 if omitted.
+
+       The demuxers listens for announcements on the given address and port.
+       Once an announcement is received, it tries to receive that particular
+       stream.
+
+       Example command lines follow.
+
+       To play back the first stream announced on the normal SAP multicast
+       address:
+
+	       ffplay sap://
+
+       To play back the first stream announced on one the default IPv6 SAP
+       multicast address:
+
+	       ffplay sap://[ff0e::2:7ffe]
+
+   sctp
+       Stream Control Transmission Protocol.
+
+       The accepted URL syntax is:
+
+	       sctp://<host>:<port>[?<options>]
+
+       The protocol accepts the following options:
+
+       listen
+	   If set to any value, listen for an incoming connection. Outgoing
+	   connection is done by default.
+
+       max_streams
+	   Set the maximum number of streams. By default no limit is set.
+
+   srt
+       Haivision Secure Reliable Transport Protocol via libsrt.
+
+       The supported syntax for a SRT URL is:
+
+	       srt://<hostname>:<port>[?<options>]
+
+       options contains a list of &-separated options of the form key=val.
+
+       or
+
+	       <options> srt://<hostname>:<port>
+
+       options contains a list of '-key val' options.
+
+       This protocol accepts the following options.
+
+       connect_timeout=milliseconds
+	   Connection timeout; SRT cannot connect for RTT > 1500 msec (2
+	   handshake exchanges) with the default connect timeout of 3 seconds.
+	   This option applies to the caller and rendezvous connection modes.
+	   The connect timeout is 10 times the value set for the rendezvous
+	   mode (which can be used as a workaround for this connection problem
+	   with earlier versions).
+
+       ffs=bytes
+	   Flight Flag Size (Window Size), in bytes. FFS is actually an
+	   internal parameter and you should set it to not less than
+	   recv_buffer_size and mss. The default value is relatively large,
+	   therefore unless you set a very large receiver buffer, you do not
+	   need to change this option. Default value is 25600.
+
+       inputbw=bytes/seconds
+	   Sender nominal input rate, in bytes per seconds. Used along with
+	   oheadbw, when maxbw is set to relative (0), to calculate maximum
+	   sending rate when recovery packets are sent along with the main
+	   media stream: inputbw * (100 + oheadbw) / 100 if inputbw is not set
+	   while maxbw is set to relative (0), the actual input rate is
+	   evaluated inside the library. Default value is 0.
+
+       iptos=tos
+	   IP Type of Service. Applies to sender only. Default value is 0xB8.
+
+       ipttl=ttl
+	   IP Time To Live. Applies to sender only. Default value is 64.
+
+       latency=microseconds
+	   Timestamp-based Packet Delivery Delay.  Used to absorb bursts of
+	   missed packet retransmissions.  This flag sets both rcvlatency and
+	   peerlatency to the same value. Note that prior to version 1.3.0
+	   this is the only flag to set the latency, however this is
+	   effectively equivalent to setting peerlatency, when side is sender
+	   and rcvlatency when side is receiver, and the bidirectional stream
+	   sending is not supported.
+
+       listen_timeout=microseconds
+	   Set socket listen timeout.
+
+       maxbw=bytes/seconds
+	   Maximum sending bandwidth, in bytes per seconds.  -1 infinite
+	   (CSRTCC limit is 30mbps) 0 relative to input rate (see inputbw) >0
+	   absolute limit value Default value is 0 (relative)
+
+       mode=caller|listener|rendezvous
+	   Connection mode.  caller opens client connection.  listener starts
+	   server to listen for incoming connections.  rendezvous use Rendez-
+	   Vous connection mode.  Default value is caller.
+
+       mss=bytes
+	   Maximum Segment Size, in bytes. Used for buffer allocation and rate
+	   calculation using a packet counter assuming fully filled packets.
+	   The smallest MSS between the peers is used. This is 1500 by default
+	   in the overall internet.  This is the maximum size of the UDP
+	   packet and can be only decreased, unless you have some unusual
+	   dedicated network settings. Default value is 1500.
+
+       nakreport=1|0
+	   If set to 1, Receiver will send `UMSG_LOSSREPORT` messages
+	   periodically until a lost packet is retransmitted or intentionally
+	   dropped. Default value is 1.
+
+       oheadbw=percents
+	   Recovery bandwidth overhead above input rate, in percents.  See
+	   inputbw. Default value is 25%.
+
+       passphrase=string
+	   HaiCrypt Encryption/Decryption Passphrase string, length from 10 to
+	   79 characters. The passphrase is the shared secret between the
+	   sender and the receiver. It is used to generate the Key Encrypting
+	   Key using PBKDF2 (Password-Based Key Derivation Function). It is
+	   used only if pbkeylen is non-zero. It is used on the receiver only
+	   if the received data is encrypted.  The configured passphrase
+	   cannot be recovered (write-only).
+
+       enforced_encryption=1|0
+	   If true, both connection parties must have the same password set
+	   (including empty, that is, with no encryption). If the password
+	   doesn't match or only one side is unencrypted, the connection is
+	   rejected. Default is true.
+
+       kmrefreshrate=packets
+	   The number of packets to be transmitted after which the encryption
+	   key is switched to a new key. Default is -1.  -1 means auto
+	   (0x1000000 in srt library). The range for this option is integers
+	   in the 0 - "INT_MAX".
+
+       kmpreannounce=packets
+	   The interval between when a new encryption key is sent and when
+	   switchover occurs. This value also applies to the subsequent
+	   interval between when switchover occurs and when the old encryption
+	   key is decommissioned. Default is -1.  -1 means auto (0x1000 in srt
+	   library). The range for this option is integers in the 0 -
+	   "INT_MAX".
+
+       snddropdelay=microseconds
+	   The sender's extra delay before dropping packets. This delay is
+	   added to the default drop delay time interval value.
+
+	   Special value -1: Do not drop packets on the sender at all.
+
+       payload_size=bytes
+	   Sets the maximum declared size of a packet transferred during the
+	   single call to the sending function in Live mode. Use 0 if this
+	   value isn't used (which is default in file mode).  Default is -1
+	   (automatic), which typically means MPEG-TS; if you are going to use
+	   SRT to send any different kind of payload, such as, for example,
+	   wrapping a live stream in very small frames, then you can use a
+	   bigger maximum frame size, though not greater than 1456 bytes.
+
+       pkt_size=bytes
+	   Alias for payload_size.
+
+       peerlatency=microseconds
+	   The latency value (as described in rcvlatency) that is set by the
+	   sender side as a minimum value for the receiver.
+
+       pbkeylen=bytes
+	   Sender encryption key length, in bytes.  Only can be set to 0, 16,
+	   24 and 32.  Enable sender encryption if not 0.  Not required on
+	   receiver (set to 0), key size obtained from sender in HaiCrypt
+	   handshake.  Default value is 0.
+
+       rcvlatency=microseconds
+	   The time that should elapse since the moment when the packet was
+	   sent and the moment when it's delivered to the receiver application
+	   in the receiving function.  This time should be a buffer time large
+	   enough to cover the time spent for sending, unexpectedly extended
+	   RTT time, and the time needed to retransmit the lost UDP packet.
+	   The effective latency value will be the maximum of this options'
+	   value and the value of peerlatency set by the peer side. Before
+	   version 1.3.0 this option is only available as latency.
+
+       recv_buffer_size=bytes
+	   Set UDP receive buffer size, expressed in bytes.
+
+       send_buffer_size=bytes
+	   Set UDP send buffer size, expressed in bytes.
+
+       timeout=microseconds
+	   Set raise error timeouts for read, write and connect operations.
+	   Note that the SRT library has internal timeouts which can be
+	   controlled separately, the value set here is only a cap on those.
+
+       tlpktdrop=1|0
+	   Too-late Packet Drop. When enabled on receiver, it skips missing
+	   packets that have not been delivered in time and delivers the
+	   following packets to the application when their time-to-play has
+	   come. It also sends a fake ACK to the sender. When enabled on
+	   sender and enabled on the receiving peer, the sender drops the
+	   older packets that have no chance of being delivered in time. It
+	   was automatically enabled in the sender if the receiver supports
+	   it.
+
+       sndbuf=bytes
+	   Set send buffer size, expressed in bytes.
+
+       rcvbuf=bytes
+	   Set receive buffer size, expressed in bytes.
+
+	   Receive buffer must not be greater than ffs.
+
+       lossmaxttl=packets
+	   The value up to which the Reorder Tolerance may grow. When Reorder
+	   Tolerance is > 0, then packet loss report is delayed until that
+	   number of packets come in. Reorder Tolerance increases every time a
+	   "belated" packet has come, but it wasn't due to retransmission
+	   (that is, when UDP packets tend to come out of order), with the
+	   difference between the latest sequence and this packet's sequence,
+	   and not more than the value of this option. By default it's 0,
+	   which means that this mechanism is turned off, and the loss report
+	   is always sent immediately upon experiencing a "gap" in sequences.
+
+       minversion
+	   The minimum SRT version that is required from the peer. A
+	   connection to a peer that does not satisfy the minimum version
+	   requirement will be rejected.
+
+	   The version format in hex is 0xXXYYZZ for x.y.z in human readable
+	   form.
+
+       streamid=string
+	   A string limited to 512 characters that can be set on the socket
+	   prior to connecting. This stream ID will be able to be retrieved by
+	   the listener side from the socket that is returned from srt_accept
+	   and was connected by a socket with that set stream ID. SRT does not
+	   enforce any special interpretation of the contents of this string.
+	   This option doesnXt make sense in Rendezvous connection; the result
+	   might be that simply one side will override the value from the
+	   other side and itXs the matter of luck which one would win
+
+       srt_streamid=string
+	   Alias for streamid to avoid conflict with ffmpeg command line
+	   option.
+
+       smoother=live|file
+	   The type of Smoother used for the transmission for that socket,
+	   which is responsible for the transmission and congestion control.
+	   The Smoother type must be exactly the same on both connecting
+	   parties, otherwise the connection is rejected.
+
+       messageapi=1|0
+	   When set, this socket uses the Message API, otherwise it uses
+	   Buffer API. Note that in live mode (see transtype) thereXs only
+	   message API available. In File mode you can chose to use one of two
+	   modes:
+
+	   Stream API (default, when this option is false). In this mode you
+	   may send as many data as you wish with one sending instruction, or
+	   even use dedicated functions that read directly from a file. The
+	   internal facility will take care of any speed and congestion
+	   control. When receiving, you can also receive as many data as
+	   desired, the data not extracted will be waiting for the next call.
+	   There is no boundary between data portions in the Stream mode.
+
+	   Message API. In this mode your single sending instruction passes
+	   exactly one piece of data that has boundaries (a message). Contrary
+	   to Live mode, this message may span across multiple UDP packets and
+	   the only size limitation is that it shall fit as a whole in the
+	   sending buffer. The receiver shall use as large buffer as necessary
+	   to receive the message, otherwise the message will not be given up.
+	   When the message is not complete (not all packets received or there
+	   was a packet loss) it will not be given up.
+
+       transtype=live|file
+	   Sets the transmission type for the socket, in particular, setting
+	   this option sets multiple other parameters to their default values
+	   as required for a particular transmission type.
+
+	   live: Set options as for live transmission. In this mode, you
+	   should send by one sending instruction only so many data that fit
+	   in one UDP packet, and limited to the value defined first in
+	   payload_size (1316 is default in this mode). There is no speed
+	   control in this mode, only the bandwidth control, if configured, in
+	   order to not exceed the bandwidth with the overhead transmission
+	   (retransmitted and control packets).
+
+	   file: Set options as for non-live transmission. See messageapi for
+	   further explanations
+
+       linger=seconds
+	   The number of seconds that the socket waits for unsent data when
+	   closing.  Default is -1. -1 means auto (off with 0 seconds in live
+	   mode, on with 180 seconds in file mode). The range for this option
+	   is integers in the 0 - "INT_MAX".
+
+       tsbpd=1|0
+	   When true, use Timestamp-based Packet Delivery mode. The default
+	   behavior depends on the transmission type: enabled in live mode,
+	   disabled in file mode.
+
+       For more information see: <https://github.com/Haivision/srt>.
+
+   srtp
+       Secure Real-time Transport Protocol.
+
+       The accepted options are:
+
+       srtp_in_suite
+       srtp_out_suite
+	   Select input and output encoding suites.
+
+	   Supported values:
+
+	   AES_CM_128_HMAC_SHA1_80
+	   SRTP_AES128_CM_HMAC_SHA1_80
+	   AES_CM_128_HMAC_SHA1_32
+	   SRTP_AES128_CM_HMAC_SHA1_32
+       srtp_in_params
+       srtp_out_params
+	   Set input and output encoding parameters, which are expressed by a
+	   base64-encoded representation of a binary block. The first 16 bytes
+	   of this binary block are used as master key, the following 14 bytes
+	   are used as master salt.
+
+   subfile
+       Virtually extract a segment of a file or another stream.  The
+       underlying stream must be seekable.
+
+       Accepted options:
+
+       start
+	   Start offset of the extracted segment, in bytes.
+
+       end End offset of the extracted segment, in bytes.  If set to 0,
+	   extract till end of file.
+
+       Examples:
+
+       Extract a chapter from a DVD VOB file (start and end sectors obtained
+       externally and multiplied by 2048):
+
+	       subfile,,start,153391104,end,268142592,,:/media/dvd/VIDEO_TS/VTS_08_1.VOB
+
+       Play an AVI file directly from a TAR archive:
+
+	       subfile,,start,183241728,end,366490624,,:archive.tar
+
+       Play a MPEG-TS file from start offset till end:
+
+	       subfile,,start,32815239,end,0,,:video.ts
+
+   tee
+       Writes the output to multiple protocols. The individual outputs are
+       separated by |
+
+	       tee:file://path/to/local/this.avi|file://path/to/local/that.avi
+
+   tcp
+       Transmission Control Protocol.
+
+       The required syntax for a TCP url is:
+
+	       tcp://<hostname>:<port>[?<options>]
+
+       options contains a list of &-separated options of the form key=val.
+
+       The list of supported options follows.
+
+       listen=2|1|0
+	   Listen for an incoming connection. 0 disables listen, 1 enables
+	   listen in single client mode, 2 enables listen in multi-client
+	   mode. Default value is 0.
+
+       local_addr=addr
+	   Local IP address of a network interface used for tcp socket
+	   connect.
+
+       local_port=port
+	   Local port used for tcp socket connect.
+
+       timeout=microseconds
+	   Set raise error timeout, expressed in microseconds.
+
+	   This option is only relevant in read mode: if no data arrived in
+	   more than this time interval, raise error.
+
+       listen_timeout=milliseconds
+	   Set listen timeout, expressed in milliseconds.
+
+       recv_buffer_size=bytes
+	   Set receive buffer size, expressed bytes.
+
+       send_buffer_size=bytes
+	   Set send buffer size, expressed bytes.
+
+       tcp_nodelay=1|0
+	   Set TCP_NODELAY to disable Nagle's algorithm. Default value is 0.
+
+	   Remark: Writing to the socket is currently not optimized to
+	   minimize system calls and reduces the efficiency / effect of
+	   TCP_NODELAY.
+
+       tcp_mss=bytes
+	   Set maximum segment size for outgoing TCP packets, expressed in
+	   bytes.
+
+       The following example shows how to setup a listening TCP connection
+       with ffmpeg, which is then accessed with ffplay:
+
+	       ffmpeg -i <input> -f <format> tcp://<hostname>:<port>?listen
+	       ffplay tcp://<hostname>:<port>
+
+   tls
+       Transport Layer Security (TLS) / Secure Sockets Layer (SSL)
+
+       The required syntax for a TLS/SSL url is:
+
+	       tls://<hostname>:<port>[?<options>]
+
+       The following parameters can be set via command line options (or in
+       code via "AVOption"s):
+
+       ca_file, cafile=filename
+	   A file containing certificate authority (CA) root certificates to
+	   treat as trusted. If the linked TLS library contains a default this
+	   might not need to be specified for verification to work, but not
+	   all libraries and setups have defaults built in.  The file must be
+	   in OpenSSL PEM format.
+
+       tls_verify=1|0
+	   If enabled, try to verify the peer that we are communicating with.
+	   Note, if using OpenSSL, this currently only makes sure that the
+	   peer certificate is signed by one of the root certificates in the
+	   CA database, but it does not validate that the certificate actually
+	   matches the host name we are trying to connect to. (With other
+	   backends, the host name is validated as well.)
+
+	   This is disabled by default since it requires a CA database to be
+	   provided by the caller in many cases.
+
+       cert_file, cert=filename
+	   A file containing a certificate to use in the handshake with the
+	   peer.  (When operating as server, in listen mode, this is more
+	   often required by the peer, while client certificates only are
+	   mandated in certain setups.)
+
+       key_file, key=filename
+	   A file containing the private key for the certificate.
+
+       listen=1|0
+	   If enabled, listen for connections on the provided port, and assume
+	   the server role in the handshake instead of the client role.
+
+       http_proxy
+	   The HTTP proxy to tunnel through, e.g. "http://example.com:1234".
+	   The proxy must support the CONNECT method.
+
+       Example command lines:
+
+       To create a TLS/SSL server that serves an input stream.
+
+	       ffmpeg -i <input> -f <format> tls://<hostname>:<port>?listen&cert=<server.crt>&key=<server.key>
+
+       To play back a stream from the TLS/SSL server using ffplay:
+
+	       ffplay tls://<hostname>:<port>
+
+   udp
+       User Datagram Protocol.
+
+       The required syntax for an UDP URL is:
+
+	       udp://<hostname>:<port>[?<options>]
+
+       options contains a list of &-separated options of the form key=val.
+
+       In case threading is enabled on the system, a circular buffer is used
+       to store the incoming data, which allows one to reduce loss of data due
+       to UDP socket buffer overruns. The fifo_size and overrun_nonfatal
+       options are related to this buffer.
+
+       The list of supported options follows.
+
+       buffer_size=size
+	   Set the UDP maximum socket buffer size in bytes. This is used to
+	   set either the receive or send buffer size, depending on what the
+	   socket is used for.	Default is 32 KB for output, 384 KB for input.
+	   See also fifo_size.
+
+       bitrate=bitrate
+	   If set to nonzero, the output will have the specified constant
+	   bitrate if the input has enough packets to sustain it.
+
+       burst_bits=bits
+	   When using bitrate this specifies the maximum number of bits in
+	   packet bursts.
+
+       localport=port
+	   Override the local UDP port to bind with.
+
+       localaddr=addr
+	   Local IP address of a network interface used for sending packets or
+	   joining multicast groups.
+
+       pkt_size=size
+	   Set the size in bytes of UDP packets.
+
+       reuse=1|0
+	   Explicitly allow or disallow reusing UDP sockets.
+
+       ttl=ttl
+	   Set the time to live value (for multicast only).
+
+       connect=1|0
+	   Initialize the UDP socket with "connect()". In this case, the
+	   destination address can't be changed with ff_udp_set_remote_url
+	   later.  If the destination address isn't known at the start, this
+	   option can be specified in ff_udp_set_remote_url, too.  This allows
+	   finding out the source address for the packets with getsockname,
+	   and makes writes return with AVERROR(ECONNREFUSED) if "destination
+	   unreachable" is received.  For receiving, this gives the benefit of
+	   only receiving packets from the specified peer address/port.
+
+       sources=address[,address]
+	   Only receive packets sent from the specified addresses. In case of
+	   multicast, also subscribe to multicast traffic coming from these
+	   addresses only.
+
+       block=address[,address]
+	   Ignore packets sent from the specified addresses. In case of
+	   multicast, also exclude the source addresses in the multicast
+	   subscription.
+
+       fifo_size=units
+	   Set the UDP receiving circular buffer size, expressed as a number
+	   of packets with size of 188 bytes. If not specified defaults to
+	   7*4096.
+
+       overrun_nonfatal=1|0
+	   Survive in case of UDP receiving circular buffer overrun. Default
+	   value is 0.
+
+       timeout=microseconds
+	   Set raise error timeout, expressed in microseconds.
+
+	   This option is only relevant in read mode: if no data arrived in
+	   more than this time interval, raise error.
+
+       broadcast=1|0
+	   Explicitly allow or disallow UDP broadcasting.
+
+	   Note that broadcasting may not work properly on networks having a
+	   broadcast storm protection.
+
+       Examples
+
+       o   Use ffmpeg to stream over UDP to a remote endpoint:
+
+		   ffmpeg -i <input> -f <format> udp://<hostname>:<port>
+
+       o   Use ffmpeg to stream in mpegts format over UDP using 188 sized UDP
+	   packets, using a large input buffer:
+
+		   ffmpeg -i <input> -f mpegts udp://<hostname>:<port>?pkt_size=188&buffer_size=65535
+
+       o   Use ffmpeg to receive over UDP from a remote endpoint:
+
+		   ffmpeg -i udp://[<multicast-address>]:<port> ...
+
+   unix
+       Unix local socket
+
+       The required syntax for a Unix socket URL is:
+
+	       unix://<filepath>
+
+       The following parameters can be set via command line options (or in
+       code via "AVOption"s):
+
+       timeout
+	   Timeout in ms.
+
+       listen
+	   Create the Unix socket in listening mode.
+
+   zmq
+       ZeroMQ asynchronous messaging using the libzmq library.
+
+       This library supports unicast streaming to multiple clients without
+       relying on an external server.
+
+       The required syntax for streaming or connecting to a stream is:
+
+	       zmq:tcp://ip-address:port
+
+       Example: Create a localhost stream on port 5555:
+
+	       ffmpeg -re -i input -f mpegts zmq:tcp://127.0.0.1:5555
+
+       Multiple clients may connect to the stream using:
+
+	       ffplay zmq:tcp://127.0.0.1:5555
+
+       Streaming to multiple clients is implemented using a ZeroMQ Pub-Sub
+       pattern.  The server side binds to a port and publishes data. Clients
+       connect to the server (via IP address/port) and subscribe to the
+       stream. The order in which the server and client start generally does
+       not matter.
+
+       ffmpeg must be compiled with the --enable-libzmq option to support this
+       protocol.
+
+       Options can be set on the ffmpeg/ffplay command line. The following
+       options are supported:
+
+       pkt_size
+	   Forces the maximum packet size for sending/receiving data. The
+	   default value is 131,072 bytes. On the server side, this sets the
+	   maximum size of sent packets via ZeroMQ. On the clients, it sets an
+	   internal buffer size for receiving packets. Note that pkt_size on
+	   the clients should be equal to or greater than pkt_size on the
+	   server. Otherwise the received message may be truncated causing
+	   decoding errors.
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libavformat(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							   FFMPEG-PROTOCOLS(1)
diff --git a/ffmpeg/manpages/ffmpeg-resampler.txt b/ffmpeg/manpages/ffmpeg-resampler.txt
new file mode 100644
index 0000000000000000000000000000000000000000..af8ecb9394af961694311041198ccfdd9d521819
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-resampler.txt
@@ -0,0 +1,259 @@
+FFMPEG-RESAMPLER(1)					   FFMPEG-RESAMPLER(1)
+
+NAME
+       ffmpeg-resampler - FFmpeg Resampler
+
+DESCRIPTION
+       The FFmpeg resampler provides a high-level interface to the
+       libswresample library audio resampling utilities. In particular it
+       allows one to perform audio resampling, audio channel layout
+       rematrixing, and convert audio format and packing layout.
+
+RESAMPLER OPTIONS
+       The audio resampler supports the following named options.
+
+       Options may be set by specifying -option value in the FFmpeg tools,
+       option=value for the aresample filter, by setting the value explicitly
+       in the "SwrContext" options or using the libavutil/opt.h API for
+       programmatic use.
+
+       uchl, used_chlayout
+	   Set used input channel layout. Default is unset. This option is
+	   only used for special remapping.
+
+       isr, in_sample_rate
+	   Set the input sample rate. Default value is 0.
+
+       osr, out_sample_rate
+	   Set the output sample rate. Default value is 0.
+
+       isf, in_sample_fmt
+	   Specify the input sample format. It is set by default to "none".
+
+       osf, out_sample_fmt
+	   Specify the output sample format. It is set by default to "none".
+
+       tsf, internal_sample_fmt
+	   Set the internal sample format. Default value is "none".  This will
+	   automatically be chosen when it is not explicitly set.
+
+       ichl, in_chlayout
+       ochl, out_chlayout
+	   Set the input/output channel layout.
+
+	   See the Channel Layout section in the ffmpeg-utils(1) manual for
+	   the required syntax.
+
+       clev, center_mix_level
+	   Set the center mix level. It is a value expressed in deciBel, and
+	   must be in the interval [-32,32].
+
+       slev, surround_mix_level
+	   Set the surround mix level. It is a value expressed in deciBel, and
+	   must be in the interval [-32,32].
+
+       lfe_mix_level
+	   Set LFE mix into non LFE level. It is used when there is a LFE
+	   input but no LFE output. It is a value expressed in deciBel, and
+	   must be in the interval [-32,32].
+
+       rmvol, rematrix_volume
+	   Set rematrix volume. Default value is 1.0.
+
+       rematrix_maxval
+	   Set maximum output value for rematrixing.  This can be used to
+	   prevent clipping vs. preventing volume reduction.  A value of 1.0
+	   prevents clipping.
+
+       flags, swr_flags
+	   Set flags used by the converter. Default value is 0.
+
+	   It supports the following individual flags:
+
+	   res force resampling, this flag forces resampling to be used even
+	       when the input and output sample rates match.
+
+       dither_scale
+	   Set the dither scale. Default value is 1.
+
+       dither_method
+	   Set dither method. Default value is 0.
+
+	   Supported values:
+
+	   rectangular
+	       select rectangular dither
+
+	   triangular
+	       select triangular dither
+
+	   triangular_hp
+	       select triangular dither with high pass
+
+	   lipshitz
+	       select Lipshitz noise shaping dither.
+
+	   shibata
+	       select Shibata noise shaping dither.
+
+	   low_shibata
+	       select low Shibata noise shaping dither.
+
+	   high_shibata
+	       select high Shibata noise shaping dither.
+
+	   f_weighted
+	       select f-weighted noise shaping dither
+
+	   modified_e_weighted
+	       select modified-e-weighted noise shaping dither
+
+	   improved_e_weighted
+	       select improved-e-weighted noise shaping dither
+
+       resampler
+	   Set resampling engine. Default value is swr.
+
+	   Supported values:
+
+	   swr select the native SW Resampler; filter options precision and
+	       cheby are not applicable in this case.
+
+	   soxr
+	       select the SoX Resampler (where available); compensation, and
+	       filter options filter_size, phase_shift, exact_rational,
+	       filter_type & kaiser_beta, are not applicable in this case.
+
+       filter_size
+	   For swr only, set resampling filter size, default value is 32.
+
+       phase_shift
+	   For swr only, set resampling phase shift, default value is 10, and
+	   must be in the interval [0,30].
+
+       linear_interp
+	   Use linear interpolation when enabled (the default). Disable it if
+	   you want to preserve speed instead of quality when exact_rational
+	   fails.
+
+       exact_rational
+	   For swr only, when enabled, try to use exact phase_count based on
+	   input and output sample rate. However, if it is larger than "1 <<
+	   phase_shift", the phase_count will be "1 << phase_shift" as
+	   fallback. Default is enabled.
+
+       cutoff
+	   Set cutoff frequency (swr: 6dB point; soxr: 0dB point) ratio; must
+	   be a float value between 0 and 1.  Default value is 0.97 with swr,
+	   and 0.91 with soxr (which, with a sample-rate of 44100, preserves
+	   the entire audio band to 20kHz).
+
+       precision
+	   For soxr only, the precision in bits to which the resampled signal
+	   will be calculated.	The default value of 20 (which, with suitable
+	   dithering, is appropriate for a destination bit-depth of 16) gives
+	   SoX's 'High Quality'; a value of 28 gives SoX's 'Very High
+	   Quality'.
+
+       cheby
+	   For soxr only, selects passband rolloff none (Chebyshev) & higher-
+	   precision approximation for 'irrational' ratios. Default value is
+	   0.
+
+       async
+	   For swr only, simple 1 parameter audio sync to timestamps using
+	   stretching, squeezing, filling and trimming. Setting this to 1 will
+	   enable filling and trimming, larger values represent the maximum
+	   amount in samples that the data may be stretched or squeezed for
+	   each second.  Default value is 0, thus no compensation is applied
+	   to make the samples match the audio timestamps.
+
+       first_pts
+	   For swr only, assume the first pts should be this value. The time
+	   unit is 1 / sample rate.  This allows for padding/trimming at the
+	   start of stream. By default, no assumption is made about the first
+	   frame's expected pts, so no padding or trimming is done. For
+	   example, this could be set to 0 to pad the beginning with silence
+	   if an audio stream starts after the video stream or to trim any
+	   samples with a negative pts due to encoder delay.
+
+       min_comp
+	   For swr only, set the minimum difference between timestamps and
+	   audio data (in seconds) to trigger stretching/squeezing/filling or
+	   trimming of the data to make it match the timestamps. The default
+	   is that stretching/squeezing/filling and trimming is disabled
+	   (min_comp = "FLT_MAX").
+
+       min_hard_comp
+	   For swr only, set the minimum difference between timestamps and
+	   audio data (in seconds) to trigger adding/dropping samples to make
+	   it match the timestamps.  This option effectively is a threshold to
+	   select between hard (trim/fill) and soft (squeeze/stretch)
+	   compensation. Note that all compensation is by default disabled
+	   through min_comp.  The default is 0.1.
+
+       comp_duration
+	   For swr only, set duration (in seconds) over which data is
+	   stretched/squeezed to make it match the timestamps. Must be a non-
+	   negative double float value, default value is 1.0.
+
+       max_soft_comp
+	   For swr only, set maximum factor by which data is
+	   stretched/squeezed to make it match the timestamps. Must be a non-
+	   negative double float value, default value is 0.
+
+       matrix_encoding
+	   Select matrixed stereo encoding.
+
+	   It accepts the following values:
+
+	   none
+	       select none
+
+	   dolby
+	       select Dolby
+
+	   dplii
+	       select Dolby Pro Logic II
+
+	   Default value is "none".
+
+       filter_type
+	   For swr only, select resampling filter type. This only affects
+	   resampling operations.
+
+	   It accepts the following values:
+
+	   cubic
+	       select cubic
+
+	   blackman_nuttall
+	       select Blackman Nuttall windowed sinc
+
+	   kaiser
+	       select Kaiser windowed sinc
+
+       kaiser_beta
+	   For swr only, set Kaiser window beta value. Must be a double float
+	   value in the interval [2,16], default value is 9.
+
+       output_sample_bits
+	   For swr only, set number of used output sample bits for dithering.
+	   Must be an integer in the interval [0,64], default value is 0,
+	   which means it's not used.
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libswresample(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							   FFMPEG-RESAMPLER(1)
diff --git a/ffmpeg/manpages/ffmpeg-scaler.txt b/ffmpeg/manpages/ffmpeg-scaler.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e15fa7de20beb94fa07d3405daf5bfeb6d37ed3d
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-scaler.txt
@@ -0,0 +1,156 @@
+FFMPEG-SCALER(1)					      FFMPEG-SCALER(1)
+
+NAME
+       ffmpeg-scaler - FFmpeg video scaling and pixel format converter
+
+DESCRIPTION
+       The FFmpeg rescaler provides a high-level interface to the libswscale
+       library image conversion utilities. In particular it allows one to
+       perform image rescaling and pixel format conversion.
+
+SCALER OPTIONS
+       The video scaler supports the following named options.
+
+       Options may be set by specifying -option value in the FFmpeg tools,
+       with a few API-only exceptions noted below.  For programmatic use, they
+       can be set explicitly in the "SwsContext" options or through the
+       libavutil/opt.h API.
+
+       sws_flags
+	   Set the scaler flags. This is also used to set the scaling
+	   algorithm. Only a single algorithm should be selected. Default
+	   value is bicubic.
+
+	   It accepts the following values:
+
+	   fast_bilinear
+	       Select fast bilinear scaling algorithm.
+
+	   bilinear
+	       Select bilinear scaling algorithm.
+
+	   bicubic
+	       Select bicubic scaling algorithm.
+
+	   experimental
+	       Select experimental scaling algorithm.
+
+	   neighbor
+	       Select nearest neighbor rescaling algorithm.
+
+	   area
+	       Select averaging area rescaling algorithm.
+
+	   bicublin
+	       Select bicubic scaling algorithm for the luma component,
+	       bilinear for chroma components.
+
+	   gauss
+	       Select Gaussian rescaling algorithm.
+
+	   sinc
+	       Select sinc rescaling algorithm.
+
+	   lanczos
+	       Select Lanczos rescaling algorithm. The default width (alpha)
+	       is 3 and can be changed by setting "param0".
+
+	   spline
+	       Select natural bicubic spline rescaling algorithm.
+
+	   print_info
+	       Enable printing/debug logging.
+
+	   accurate_rnd
+	       Enable accurate rounding.
+
+	   full_chroma_int
+	       Enable full chroma interpolation.
+
+	   full_chroma_inp
+	       Select full chroma input.
+
+	   bitexact
+	       Enable bitexact output.
+
+       srcw (API only)
+	   Set source width.
+
+       srch (API only)
+	   Set source height.
+
+       dstw (API only)
+	   Set destination width.
+
+       dsth (API only)
+	   Set destination height.
+
+       src_format (API only)
+	   Set source pixel format (must be expressed as an integer).
+
+       dst_format (API only)
+	   Set destination pixel format (must be expressed as an integer).
+
+       src_range (boolean)
+	   If value is set to 1, indicates source is full range. Default value
+	   is 0, which indicates source is limited range.
+
+       dst_range (boolean)
+	   If value is set to 1, enable full range for destination. Default
+	   value is 0, which enables limited range.
+
+       param0, param1
+	   Set scaling algorithm parameters. The specified values are specific
+	   of some scaling algorithms and ignored by others. The specified
+	   values are floating point number values.
+
+       sws_dither
+	   Set the dithering algorithm. Accepts one of the following values.
+	   Default value is auto.
+
+	   auto
+	       automatic choice
+
+	   none
+	       no dithering
+
+	   bayer
+	       bayer dither
+
+	   ed  error diffusion dither
+
+	   a_dither
+	       arithmetic dither, based using addition
+
+	   x_dither
+	       arithmetic dither, based using xor (more random/less apparent
+	       patterning that a_dither).
+
+       alphablend
+	   Set the alpha blending to use when the input has alpha but the
+	   output does not.  Default value is none.
+
+	   uniform_color
+	       Blend onto a uniform background color
+
+	   checkerboard
+	       Blend onto a checkerboard
+
+	   none
+	       No blending
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libswscale(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							      FFMPEG-SCALER(1)
diff --git a/ffmpeg/manpages/ffmpeg-utils.txt b/ffmpeg/manpages/ffmpeg-utils.txt
new file mode 100644
index 0000000000000000000000000000000000000000..eb0cc8fbccfe2f94fff2f7ee9650136200b121ee
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg-utils.txt
@@ -0,0 +1,1267 @@
+FFMPEG-UTILS(1) 					       FFMPEG-UTILS(1)
+
+NAME
+       ffmpeg-utils - FFmpeg utilities
+
+DESCRIPTION
+       This document describes some generic features and utilities provided by
+       the libavutil library.
+
+SYNTAX
+       This section documents the syntax and formats employed by the FFmpeg
+       libraries and tools.
+
+   Quoting and escaping
+       FFmpeg adopts the following quoting and escaping mechanism, unless
+       explicitly specified. The following rules are applied:
+
+       o   ' and \ are special characters (respectively used for quoting and
+	   escaping). In addition to them, there might be other special
+	   characters depending on the specific syntax where the escaping and
+	   quoting are employed.
+
+       o   A special character is escaped by prefixing it with a \.
+
+       o   All characters enclosed between '' are included literally in the
+	   parsed string. The quote character ' itself cannot be quoted, so
+	   you may need to close the quote and escape it.
+
+       o   Leading and trailing whitespaces, unless escaped or quoted, are
+	   removed from the parsed string.
+
+       Note that you may need to add a second level of escaping when using the
+       command line or a script, which depends on the syntax of the adopted
+       shell language.
+
+       The function "av_get_token" defined in libavutil/avstring.h can be used
+       to parse a token quoted or escaped according to the rules defined
+       above.
+
+       The tool tools/ffescape in the FFmpeg source tree can be used to
+       automatically quote or escape a string in a script.
+
+       Examples
+
+       o   Escape the string "Crime d'Amour" containing the "'" special
+	   character:
+
+		   Crime d\'Amour
+
+       o   The string above contains a quote, so the "'" needs to be escaped
+	   when quoting it:
+
+		   'Crime d'\''Amour'
+
+       o   Include leading or trailing whitespaces using quoting:
+
+		   '  this string starts and ends with whitespaces  '
+
+       o   Escaping and quoting can be mixed together:
+
+		   ' The string '\'string\'' is a string '
+
+       o   To include a literal \ you can use either escaping or quoting:
+
+		   'c:\foo' can be written as c:\\foo
+
+   Date
+       The accepted syntax is:
+
+	       [(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z]
+	       now
+
+       If the value is "now" it takes the current time.
+
+       Time is local time unless Z is appended, in which case it is
+       interpreted as UTC.  If the year-month-day part is not specified it
+       takes the current year-month-day.
+
+   Time duration
+       There are two accepted syntaxes for expressing time duration.
+
+	       [-][<HH>:]<MM>:<SS>[.<m>...]
+
+       HH expresses the number of hours, MM the number of minutes for a
+       maximum of 2 digits, and SS the number of seconds for a maximum of 2
+       digits. The m at the end expresses decimal value for SS.
+
+       or
+
+	       [-]<S>+[.<m>...][s|ms|us]
+
+       S expresses the number of seconds, with the optional decimal part m.
+       The optional literal suffixes s, ms or us indicate to interpret the
+       value as seconds, milliseconds or microseconds, respectively.
+
+       In both expressions, the optional - indicates negative duration.
+
+       Examples
+
+       The following examples are all valid time duration:
+
+       55  55 seconds
+
+       0.2 0.2 seconds
+
+       200ms
+	   200 milliseconds, that's 0.2s
+
+       200000us
+	   200000 microseconds, that's 0.2s
+
+       12:03:45
+	   12 hours, 03 minutes and 45 seconds
+
+       23.189
+	   23.189 seconds
+
+   Video size
+       Specify the size of the sourced video, it may be a string of the form
+       widthxheight, or the name of a size abbreviation.
+
+       The following abbreviations are recognized:
+
+       ntsc
+	   720x480
+
+       pal 720x576
+
+       qntsc
+	   352x240
+
+       qpal
+	   352x288
+
+       sntsc
+	   640x480
+
+       spal
+	   768x576
+
+       film
+	   352x240
+
+       ntsc-film
+	   352x240
+
+       sqcif
+	   128x96
+
+       qcif
+	   176x144
+
+       cif 352x288
+
+       4cif
+	   704x576
+
+       16cif
+	   1408x1152
+
+       qqvga
+	   160x120
+
+       qvga
+	   320x240
+
+       vga 640x480
+
+       svga
+	   800x600
+
+       xga 1024x768
+
+       uxga
+	   1600x1200
+
+       qxga
+	   2048x1536
+
+       sxga
+	   1280x1024
+
+       qsxga
+	   2560x2048
+
+       hsxga
+	   5120x4096
+
+       wvga
+	   852x480
+
+       wxga
+	   1366x768
+
+       wsxga
+	   1600x1024
+
+       wuxga
+	   1920x1200
+
+       woxga
+	   2560x1600
+
+       wqsxga
+	   3200x2048
+
+       wquxga
+	   3840x2400
+
+       whsxga
+	   6400x4096
+
+       whuxga
+	   7680x4800
+
+       cga 320x200
+
+       ega 640x350
+
+       hd480
+	   852x480
+
+       hd720
+	   1280x720
+
+       hd1080
+	   1920x1080
+
+       2k  2048x1080
+
+       2kflat
+	   1998x1080
+
+       2kscope
+	   2048x858
+
+       4k  4096x2160
+
+       4kflat
+	   3996x2160
+
+       4kscope
+	   4096x1716
+
+       nhd 640x360
+
+       hqvga
+	   240x160
+
+       wqvga
+	   400x240
+
+       fwqvga
+	   432x240
+
+       hvga
+	   480x320
+
+       qhd 960x540
+
+       2kdci
+	   2048x1080
+
+       4kdci
+	   4096x2160
+
+       uhd2160
+	   3840x2160
+
+       uhd4320
+	   7680x4320
+
+   Video rate
+       Specify the frame rate of a video, expressed as the number of frames
+       generated per second. It has to be a string in the format
+       frame_rate_num/frame_rate_den, an integer number, a float number or a
+       valid video frame rate abbreviation.
+
+       The following abbreviations are recognized:
+
+       ntsc
+	   30000/1001
+
+       pal 25/1
+
+       qntsc
+	   30000/1001
+
+       qpal
+	   25/1
+
+       sntsc
+	   30000/1001
+
+       spal
+	   25/1
+
+       film
+	   24/1
+
+       ntsc-film
+	   24000/1001
+
+   Ratio
+       A ratio can be expressed as an expression, or in the form
+       numerator:denominator.
+
+       Note that a ratio with infinite (1/0) or negative value is considered
+       valid, so you should check on the returned value if you want to exclude
+       those values.
+
+       The undefined value can be expressed using the "0:0" string.
+
+   Color
+       It can be the name of a color as defined below (case insensitive match)
+       or a "[0x|#]RRGGBB[AA]" sequence, possibly followed by @ and a string
+       representing the alpha component.
+
+       The alpha component may be a string composed by "0x" followed by an
+       hexadecimal number or a decimal number between 0.0 and 1.0, which
+       represents the opacity value (0x00 or 0.0 means completely transparent,
+       0xff or 1.0 completely opaque). If the alpha component is not specified
+       then 0xff is assumed.
+
+       The string random will result in a random color.
+
+       The following names of colors are recognized:
+
+       AliceBlue
+	   0xF0F8FF
+
+       AntiqueWhite
+	   0xFAEBD7
+
+       Aqua
+	   0x00FFFF
+
+       Aquamarine
+	   0x7FFFD4
+
+       Azure
+	   0xF0FFFF
+
+       Beige
+	   0xF5F5DC
+
+       Bisque
+	   0xFFE4C4
+
+       Black
+	   0x000000
+
+       BlanchedAlmond
+	   0xFFEBCD
+
+       Blue
+	   0x0000FF
+
+       BlueViolet
+	   0x8A2BE2
+
+       Brown
+	   0xA52A2A
+
+       BurlyWood
+	   0xDEB887
+
+       CadetBlue
+	   0x5F9EA0
+
+       Chartreuse
+	   0x7FFF00
+
+       Chocolate
+	   0xD2691E
+
+       Coral
+	   0xFF7F50
+
+       CornflowerBlue
+	   0x6495ED
+
+       Cornsilk
+	   0xFFF8DC
+
+       Crimson
+	   0xDC143C
+
+       Cyan
+	   0x00FFFF
+
+       DarkBlue
+	   0x00008B
+
+       DarkCyan
+	   0x008B8B
+
+       DarkGoldenRod
+	   0xB8860B
+
+       DarkGray
+	   0xA9A9A9
+
+       DarkGreen
+	   0x006400
+
+       DarkKhaki
+	   0xBDB76B
+
+       DarkMagenta
+	   0x8B008B
+
+       DarkOliveGreen
+	   0x556B2F
+
+       Darkorange
+	   0xFF8C00
+
+       DarkOrchid
+	   0x9932CC
+
+       DarkRed
+	   0x8B0000
+
+       DarkSalmon
+	   0xE9967A
+
+       DarkSeaGreen
+	   0x8FBC8F
+
+       DarkSlateBlue
+	   0x483D8B
+
+       DarkSlateGray
+	   0x2F4F4F
+
+       DarkTurquoise
+	   0x00CED1
+
+       DarkViolet
+	   0x9400D3
+
+       DeepPink
+	   0xFF1493
+
+       DeepSkyBlue
+	   0x00BFFF
+
+       DimGray
+	   0x696969
+
+       DodgerBlue
+	   0x1E90FF
+
+       FireBrick
+	   0xB22222
+
+       FloralWhite
+	   0xFFFAF0
+
+       ForestGreen
+	   0x228B22
+
+       Fuchsia
+	   0xFF00FF
+
+       Gainsboro
+	   0xDCDCDC
+
+       GhostWhite
+	   0xF8F8FF
+
+       Gold
+	   0xFFD700
+
+       GoldenRod
+	   0xDAA520
+
+       Gray
+	   0x808080
+
+       Green
+	   0x008000
+
+       GreenYellow
+	   0xADFF2F
+
+       HoneyDew
+	   0xF0FFF0
+
+       HotPink
+	   0xFF69B4
+
+       IndianRed
+	   0xCD5C5C
+
+       Indigo
+	   0x4B0082
+
+       Ivory
+	   0xFFFFF0
+
+       Khaki
+	   0xF0E68C
+
+       Lavender
+	   0xE6E6FA
+
+       LavenderBlush
+	   0xFFF0F5
+
+       LawnGreen
+	   0x7CFC00
+
+       LemonChiffon
+	   0xFFFACD
+
+       LightBlue
+	   0xADD8E6
+
+       LightCoral
+	   0xF08080
+
+       LightCyan
+	   0xE0FFFF
+
+       LightGoldenRodYellow
+	   0xFAFAD2
+
+       LightGreen
+	   0x90EE90
+
+       LightGrey
+	   0xD3D3D3
+
+       LightPink
+	   0xFFB6C1
+
+       LightSalmon
+	   0xFFA07A
+
+       LightSeaGreen
+	   0x20B2AA
+
+       LightSkyBlue
+	   0x87CEFA
+
+       LightSlateGray
+	   0x778899
+
+       LightSteelBlue
+	   0xB0C4DE
+
+       LightYellow
+	   0xFFFFE0
+
+       Lime
+	   0x00FF00
+
+       LimeGreen
+	   0x32CD32
+
+       Linen
+	   0xFAF0E6
+
+       Magenta
+	   0xFF00FF
+
+       Maroon
+	   0x800000
+
+       MediumAquaMarine
+	   0x66CDAA
+
+       MediumBlue
+	   0x0000CD
+
+       MediumOrchid
+	   0xBA55D3
+
+       MediumPurple
+	   0x9370D8
+
+       MediumSeaGreen
+	   0x3CB371
+
+       MediumSlateBlue
+	   0x7B68EE
+
+       MediumSpringGreen
+	   0x00FA9A
+
+       MediumTurquoise
+	   0x48D1CC
+
+       MediumVioletRed
+	   0xC71585
+
+       MidnightBlue
+	   0x191970
+
+       MintCream
+	   0xF5FFFA
+
+       MistyRose
+	   0xFFE4E1
+
+       Moccasin
+	   0xFFE4B5
+
+       NavajoWhite
+	   0xFFDEAD
+
+       Navy
+	   0x000080
+
+       OldLace
+	   0xFDF5E6
+
+       Olive
+	   0x808000
+
+       OliveDrab
+	   0x6B8E23
+
+       Orange
+	   0xFFA500
+
+       OrangeRed
+	   0xFF4500
+
+       Orchid
+	   0xDA70D6
+
+       PaleGoldenRod
+	   0xEEE8AA
+
+       PaleGreen
+	   0x98FB98
+
+       PaleTurquoise
+	   0xAFEEEE
+
+       PaleVioletRed
+	   0xD87093
+
+       PapayaWhip
+	   0xFFEFD5
+
+       PeachPuff
+	   0xFFDAB9
+
+       Peru
+	   0xCD853F
+
+       Pink
+	   0xFFC0CB
+
+       Plum
+	   0xDDA0DD
+
+       PowderBlue
+	   0xB0E0E6
+
+       Purple
+	   0x800080
+
+       Red 0xFF0000
+
+       RosyBrown
+	   0xBC8F8F
+
+       RoyalBlue
+	   0x4169E1
+
+       SaddleBrown
+	   0x8B4513
+
+       Salmon
+	   0xFA8072
+
+       SandyBrown
+	   0xF4A460
+
+       SeaGreen
+	   0x2E8B57
+
+       SeaShell
+	   0xFFF5EE
+
+       Sienna
+	   0xA0522D
+
+       Silver
+	   0xC0C0C0
+
+       SkyBlue
+	   0x87CEEB
+
+       SlateBlue
+	   0x6A5ACD
+
+       SlateGray
+	   0x708090
+
+       Snow
+	   0xFFFAFA
+
+       SpringGreen
+	   0x00FF7F
+
+       SteelBlue
+	   0x4682B4
+
+       Tan 0xD2B48C
+
+       Teal
+	   0x008080
+
+       Thistle
+	   0xD8BFD8
+
+       Tomato
+	   0xFF6347
+
+       Turquoise
+	   0x40E0D0
+
+       Violet
+	   0xEE82EE
+
+       Wheat
+	   0xF5DEB3
+
+       White
+	   0xFFFFFF
+
+       WhiteSmoke
+	   0xF5F5F5
+
+       Yellow
+	   0xFFFF00
+
+       YellowGreen
+	   0x9ACD32
+
+   Channel Layout
+       A channel layout specifies the spatial disposition of the channels in a
+       multi-channel audio stream. To specify a channel layout, FFmpeg makes
+       use of a special syntax.
+
+       Individual channels are identified by an id, as given by the table
+       below:
+
+       FL  front left
+
+       FR  front right
+
+       FC  front center
+
+       LFE low frequency
+
+       BL  back left
+
+       BR  back right
+
+       FLC front left-of-center
+
+       FRC front right-of-center
+
+       BC  back center
+
+       SL  side left
+
+       SR  side right
+
+       TC  top center
+
+       TFL top front left
+
+       TFC top front center
+
+       TFR top front right
+
+       TBL top back left
+
+       TBC top back center
+
+       TBR top back right
+
+       DL  downmix left
+
+       DR  downmix right
+
+       WL  wide left
+
+       WR  wide right
+
+       SDL surround direct left
+
+       SDR surround direct right
+
+       LFE2
+	   low frequency 2
+
+       Standard channel layout compositions can be specified by using the
+       following identifiers:
+
+       mono
+	   FC
+
+       stereo
+	   FL+FR
+
+       2.1 FL+FR+LFE
+
+       3.0 FL+FR+FC
+
+       3.0(back)
+	   FL+FR+BC
+
+       4.0 FL+FR+FC+BC
+
+       quad
+	   FL+FR+BL+BR
+
+       quad(side)
+	   FL+FR+SL+SR
+
+       3.1 FL+FR+FC+LFE
+
+       5.0 FL+FR+FC+BL+BR
+
+       5.0(side)
+	   FL+FR+FC+SL+SR
+
+       4.1 FL+FR+FC+LFE+BC
+
+       5.1 FL+FR+FC+LFE+BL+BR
+
+       5.1(side)
+	   FL+FR+FC+LFE+SL+SR
+
+       6.0 FL+FR+FC+BC+SL+SR
+
+       6.0(front)
+	   FL+FR+FLC+FRC+SL+SR
+
+       3.1.2
+	   FL+FR+FC+LFE+TFL+TFR
+
+       hexagonal
+	   FL+FR+FC+BL+BR+BC
+
+       6.1 FL+FR+FC+LFE+BC+SL+SR
+
+       6.1 FL+FR+FC+LFE+BL+BR+BC
+
+       6.1(front)
+	   FL+FR+LFE+FLC+FRC+SL+SR
+
+       7.0 FL+FR+FC+BL+BR+SL+SR
+
+       7.0(front)
+	   FL+FR+FC+FLC+FRC+SL+SR
+
+       7.1 FL+FR+FC+LFE+BL+BR+SL+SR
+
+       7.1(wide)
+	   FL+FR+FC+LFE+BL+BR+FLC+FRC
+
+       7.1(wide-side)
+	   FL+FR+FC+LFE+FLC+FRC+SL+SR
+
+       5.1.2
+	   FL+FR+FC+LFE+BL+BR+TFL+TFR
+
+       octagonal
+	   FL+FR+FC+BL+BR+BC+SL+SR
+
+       cube
+	   FL+FR+BL+BR+TFL+TFR+TBL+TBR
+
+       5.1.4
+	   FL+FR+FC+LFE+BL+BR+TFL+TFR+TBL+TBR
+
+       7.1.2
+	   FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR
+
+       7.1.4
+	   FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBL+TBR
+
+       7.2.3
+	   FL+FR+FC+LFE+BL+BR+SL+SR+TFL+TFR+TBC+LFE2
+
+       9.1.4
+	   FL+FR+FC+LFE+BL+BR+FLC+FRC+SL+SR+TFL+TFR+TBL+TBR
+
+       hexadecagonal
+	   FL+FR+FC+BL+BR+BC+SL+SR+WL+WR+TBL+TBR+TBC+TFC+TFL+TFR
+
+       downmix
+	   DL+DR
+
+       22.2
+	   FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL+TBC+TBR+LFE2+TSL+TSR+BFC+BFL+BFR
+
+       A custom channel layout can be specified as a sequence of terms,
+       separated by '+'.  Each term can be:
+
+       o   the name of a single channel (e.g. FL, FR, FC, LFE, etc.), each
+	   optionally containing a custom name after a '@', (e.g. FL@Left,
+	   FR@Right, FC@Center, LFE@Low_Frequency, etc.)
+
+       A standard channel layout can be specified by the following:
+
+       o   the name of a single channel (e.g. FL, FR, FC, LFE, etc.)
+
+       o   the name of a standard channel layout (e.g. mono, stereo, 4.0,
+	   quad, 5.0, etc.)
+
+       o   a number of channels, in decimal, followed by 'c', yielding the
+	   default channel layout for that number of channels (see the
+	   function "av_channel_layout_default"). Note that not all channel
+	   counts have a default layout.
+
+       o   a number of channels, in decimal, followed by 'C', yielding an
+	   unknown channel layout with the specified number of channels. Note
+	   that not all channel layout specification strings support unknown
+	   channel layouts.
+
+       o   a channel layout mask, in hexadecimal starting with "0x" (see the
+	   "AV_CH_*" macros in libavutil/channel_layout.h.
+
+       Before libavutil version 53 the trailing character "c" to specify a
+       number of channels was optional, but now it is required, while a
+       channel layout mask can also be specified as a decimal number (if and
+       only if not followed by "c" or "C").
+
+       See also the function "av_channel_layout_from_string" defined in
+       libavutil/channel_layout.h.
+
+EXPRESSION EVALUATION
+       When evaluating an arithmetic expression, FFmpeg uses an internal
+       formula evaluator, implemented through the libavutil/eval.h interface.
+
+       An expression may contain unary, binary operators, constants, and
+       functions.
+
+       Two expressions expr1 and expr2 can be combined to form another
+       expression "expr1;expr2".  expr1 and expr2 are evaluated in turn, and
+       the new expression evaluates to the value of expr2.
+
+       The following binary operators are available: "+", "-", "*", "/", "^".
+
+       The following unary operators are available: "+", "-".
+
+       The following functions are available:
+
+       abs(x)
+	   Compute absolute value of x.
+
+       acos(x)
+	   Compute arccosine of x.
+
+       asin(x)
+	   Compute arcsine of x.
+
+       atan(x)
+	   Compute arctangent of x.
+
+       atan2(y, x)
+	   Compute principal value of the arc tangent of y/x.
+
+       between(x, min, max)
+	   Return 1 if x is greater than or equal to min and lesser than or
+	   equal to max, 0 otherwise.
+
+       bitand(x, y)
+       bitor(x, y)
+	   Compute bitwise and/or operation on x and y.
+
+	   The results of the evaluation of x and y are converted to integers
+	   before executing the bitwise operation.
+
+	   Note that both the conversion to integer and the conversion back to
+	   floating point can lose precision. Beware of unexpected results for
+	   large numbers (usually 2^53 and larger).
+
+       ceil(expr)
+	   Round the value of expression expr upwards to the nearest integer.
+	   For example, "ceil(1.5)" is "2.0".
+
+       clip(x, min, max)
+	   Return the value of x clipped between min and max.
+
+       cos(x)
+	   Compute cosine of x.
+
+       cosh(x)
+	   Compute hyperbolic cosine of x.
+
+       eq(x, y)
+	   Return 1 if x and y are equivalent, 0 otherwise.
+
+       exp(x)
+	   Compute exponential of x (with base "e", the Euler's number).
+
+       floor(expr)
+	   Round the value of expression expr downwards to the nearest
+	   integer. For example, "floor(-1.5)" is "-2.0".
+
+       gauss(x)
+	   Compute Gauss function of x, corresponding to "exp(-x*x/2) /
+	   sqrt(2*PI)".
+
+       gcd(x, y)
+	   Return the greatest common divisor of x and y. If both x and y are
+	   0 or either or both are less than zero then behavior is undefined.
+
+       gt(x, y)
+	   Return 1 if x is greater than y, 0 otherwise.
+
+       gte(x, y)
+	   Return 1 if x is greater than or equal to y, 0 otherwise.
+
+       hypot(x, y)
+	   This function is similar to the C function with the same name; it
+	   returns "sqrt(x*x + y*y)", the length of the hypotenuse of a right
+	   triangle with sides of length x and y, or the distance of the point
+	   (x, y) from the origin.
+
+       if(x, y)
+	   Evaluate x, and if the result is non-zero return the result of the
+	   evaluation of y, return 0 otherwise.
+
+       if(x, y, z)
+	   Evaluate x, and if the result is non-zero return the evaluation
+	   result of y, otherwise the evaluation result of z.
+
+       ifnot(x, y)
+	   Evaluate x, and if the result is zero return the result of the
+	   evaluation of y, return 0 otherwise.
+
+       ifnot(x, y, z)
+	   Evaluate x, and if the result is zero return the evaluation result
+	   of y, otherwise the evaluation result of z.
+
+       isinf(x)
+	   Return 1.0 if x is +/-INFINITY, 0.0 otherwise.
+
+       isnan(x)
+	   Return 1.0 if x is NAN, 0.0 otherwise.
+
+       ld(var)
+	   Load the value of the internal variable with number var, which was
+	   previously stored with st(var, expr).  The function returns the
+	   loaded value.
+
+       lerp(x, y, z)
+	   Return linear interpolation between x and y by amount of z.
+
+       log(x)
+	   Compute natural logarithm of x.
+
+       lt(x, y)
+	   Return 1 if x is lesser than y, 0 otherwise.
+
+       lte(x, y)
+	   Return 1 if x is lesser than or equal to y, 0 otherwise.
+
+       max(x, y)
+	   Return the maximum between x and y.
+
+       min(x, y)
+	   Return the minimum between x and y.
+
+       mod(x, y)
+	   Compute the remainder of division of x by y.
+
+       not(expr)
+	   Return 1.0 if expr is zero, 0.0 otherwise.
+
+       pow(x, y)
+	   Compute the power of x elevated y, it is equivalent to "(x)^(y)".
+
+       print(t)
+       print(t, l)
+	   Print the value of expression t with loglevel l. If l is not
+	   specified then a default log level is used.	Returns the value of
+	   the expression printed.
+
+	   Prints t with loglevel l
+
+       random(idx)
+	   Return a pseudo random value between 0.0 and 1.0. idx is the index
+	   of the internal variable which will be used to save the seed/state.
+
+       randomi(idx, min, max)
+	   Return a pseudo random value in the interval between min and max.
+	   idx is the index of the internal variable which will be used to
+	   save the seed/state.
+
+       root(expr, max)
+	   Find an input value for which the function represented by expr with
+	   argument ld(0) is 0 in the interval 0..max.
+
+	   The expression in expr must denote a continuous function or the
+	   result is undefined.
+
+	   ld(0) is used to represent the function input value, which means
+	   that the given expression will be evaluated multiple times with
+	   various input values that the expression can access through ld(0).
+	   When the expression evaluates to 0 then the corresponding input
+	   value will be returned.
+
+       round(expr)
+	   Round the value of expression expr to the nearest integer. For
+	   example, "round(1.5)" is "2.0".
+
+       sgn(x)
+	   Compute sign of x.
+
+       sin(x)
+	   Compute sine of x.
+
+       sinh(x)
+	   Compute hyperbolic sine of x.
+
+       sqrt(expr)
+	   Compute the square root of expr. This is equivalent to "(expr)^.5".
+
+       squish(x)
+	   Compute expression "1/(1 + exp(4*x))".
+
+       st(var, expr)
+	   Store the value of the expression expr in an internal variable. var
+	   specifies the number of the variable where to store the value, and
+	   it is a value ranging from 0 to 9. The function returns the value
+	   stored in the internal variable.  Note, Variables are currently not
+	   shared between expressions.
+
+       tan(x)
+	   Compute tangent of x.
+
+       tanh(x)
+	   Compute hyperbolic tangent of x.
+
+       taylor(expr, x)
+       taylor(expr, x, id)
+	   Evaluate a Taylor series at x, given an expression representing the
+	   "ld(id)"-th derivative of a function at 0.
+
+	   When the series does not converge the result is undefined.
+
+	   ld(id) is used to represent the derivative order in expr, which
+	   means that the given expression will be evaluated multiple times
+	   with various input values that the expression can access through
+	   "ld(id)". If id is not specified then 0 is assumed.
+
+	   Note, when you have the derivatives at y instead of 0,
+	   "taylor(expr, x-y)" can be used.
+
+       time(0)
+	   Return the current (wallclock) time in seconds.
+
+       trunc(expr)
+	   Round the value of expression expr towards zero to the nearest
+	   integer. For example, "trunc(-1.5)" is "-1.0".
+
+       while(cond, expr)
+	   Evaluate expression expr while the expression cond is non-zero, and
+	   returns the value of the last expr evaluation, or NAN if cond was
+	   always false.
+
+       The following constants are available:
+
+       PI  area of the unit disc, approximately 3.14
+
+       E   exp(1) (Euler's number), approximately 2.718
+
+       PHI golden ratio (1+sqrt(5))/2, approximately 1.618
+
+       Assuming that an expression is considered "true" if it has a non-zero
+       value, note that:
+
+       "*" works like AND
+
+       "+" works like OR
+
+       For example the construct:
+
+	       if (A AND B) then C
+
+       is equivalent to:
+
+	       if(A*B, C)
+
+       In your C code, you can extend the list of unary and binary functions,
+       and define recognized constants, so that they are available for your
+       expressions.
+
+       The evaluator also recognizes the International System unit prefixes.
+       If 'i' is appended after the prefix, binary prefixes are used, which
+       are based on powers of 1024 instead of powers of 1000.  The 'B' postfix
+       multiplies the value by 8, and can be appended after a unit prefix or
+       used alone. This allows using for example 'KB', 'MiB', 'G' and 'B' as
+       number postfix.
+
+       The list of available International System prefixes follows, with
+       indication of the corresponding powers of 10 and of 2.
+
+       y   10^-24 / 2^-80
+
+       z   10^-21 / 2^-70
+
+       a   10^-18 / 2^-60
+
+       f   10^-15 / 2^-50
+
+       p   10^-12 / 2^-40
+
+       n   10^-9 / 2^-30
+
+       u   10^-6 / 2^-20
+
+       m   10^-3 / 2^-10
+
+       c   10^-2
+
+       d   10^-1
+
+       h   10^2
+
+       k   10^3 / 2^10
+
+       K   10^3 / 2^10
+
+       M   10^6 / 2^20
+
+       G   10^9 / 2^30
+
+       T   10^12 / 2^40
+
+       P   10^15 / 2^50
+
+       E   10^18 / 2^60
+
+       Z   10^21 / 2^70
+
+       Y   10^24 / 2^80
+
+SEE ALSO
+       ffmpeg(1), ffplay(1), ffprobe(1), libavutil(3)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+							       FFMPEG-UTILS(1)
diff --git a/ffmpeg/manpages/ffmpeg.txt b/ffmpeg/manpages/ffmpeg.txt
new file mode 100644
index 0000000000000000000000000000000000000000..4650a9d6784cfb8dc9b443290e01bd96602f0c30
--- /dev/null
+++ b/ffmpeg/manpages/ffmpeg.txt
@@ -0,0 +1,3144 @@
+FFMPEG(1)							     FFMPEG(1)
+
+NAME
+       ffmpeg - ffmpeg media converter
+
+SYNOPSIS
+       ffmpeg [global_options] {[input_file_options] -i input_url} ...
+       {[output_file_options] output_url} ...
+
+DESCRIPTION
+       ffmpeg is a universal media converter. It can read a wide variety of
+       inputs - including live grabbing/recording devices - filter, and
+       transcode them into a plethora of output formats.
+
+       ffmpeg reads from an arbitrary number of input "files" (which can be
+       regular files, pipes, network streams, grabbing devices, etc.),
+       specified by the "-i" option, and writes to an arbitrary number of
+       output "files", which are specified by a plain output url. Anything
+       found on the command line which cannot be interpreted as an option is
+       considered to be an output url.
+
+       Each input or output url can, in principle, contain any number of
+       streams of different types (video/audio/subtitle/attachment/data). The
+       allowed number and/or types of streams may be limited by the container
+       format. Selecting which streams from which inputs will go into which
+       output is either done automatically or with the "-map" option (see the
+       Stream selection chapter).
+
+       To refer to input files in options, you must use their indices
+       (0-based). E.g.	the first input file is 0, the second is 1, etc.
+       Similarly, streams within a file are referred to by their indices. E.g.
+       "2:3" refers to the fourth stream in the third input file. Also see the
+       Stream specifiers chapter.
+
+       As a general rule, options are applied to the next specified file.
+       Therefore, order is important, and you can have the same option on the
+       command line multiple times. Each occurrence is then applied to the
+       next input or output file.  Exceptions from this rule are the global
+       options (e.g. verbosity level), which should be specified first.
+
+       Do not mix input and output files -- first specify all input files,
+       then all output files. Also do not mix options which belong to
+       different files. All options apply ONLY to the next input or output
+       file and are reset between files.
+
+       Some simple examples follow.
+
+       o   Convert an input media file to a different format, by re-encoding
+	   media streams:
+
+		   ffmpeg -i input.avi output.mp4
+
+       o   Set the video bitrate of the output file to 64 kbit/s:
+
+		   ffmpeg -i input.avi -b:v 64k -bufsize 64k output.mp4
+
+       o   Force the frame rate of the output file to 24 fps:
+
+		   ffmpeg -i input.avi -r 24 output.mp4
+
+       o   Force the frame rate of the input file (valid for raw formats only)
+	   to 1 fps and the frame rate of the output file to 24 fps:
+
+		   ffmpeg -r 1 -i input.m2v -r 24 output.mp4
+
+       The format option may be needed for raw input files.
+
+DETAILED DESCRIPTION
+       The transcoding process in ffmpeg for each output can be described by
+       the following diagram:
+
+		_______ 	     ______________
+	       |       |	    |		   |
+	       | input |  demuxer   | encoded data |   decoder
+	       | file  | ---------> | packets	   | -----+
+	       |_______|	    |______________|	  |
+							  v
+						      _________
+						     |	       |
+						     | decoded |
+						     | frames  |
+						     |_________|
+		________	     ______________	  |
+	       |	|	    |		   |	  |
+	       | output | <-------- | encoded data | <----+
+	       | file	|   muxer   | packets	   |   encoder
+	       |________|	    |______________|
+
+       ffmpeg calls the libavformat library (containing demuxers) to read
+       input files and get packets containing encoded data from them. When
+       there are multiple input files, ffmpeg tries to keep them synchronized
+       by tracking lowest timestamp on any active input stream.
+
+       Encoded packets are then passed to the decoder (unless streamcopy is
+       selected for the stream, see further for a description). The decoder
+       produces uncompressed frames (raw video/PCM audio/...) which can be
+       processed further by filtering (see next section). After filtering, the
+       frames are passed to the encoder, which encodes them and outputs
+       encoded packets. Finally, those are passed to the muxer, which writes
+       the encoded packets to the output file.
+
+   Filtering
+       Before encoding, ffmpeg can process raw audio and video frames using
+       filters from the libavfilter library. Several chained filters form a
+       filter graph. ffmpeg distinguishes between two types of filtergraphs:
+       simple and complex.
+
+       Simple filtergraphs
+
+       Simple filtergraphs are those that have exactly one input and output,
+       both of the same type. In the above diagram they can be represented by
+       simply inserting an additional step between decoding and encoding:
+
+		_________			 ______________
+	       |	 |			|	       |
+	       | decoded |			| encoded data |
+	       | frames  |\		      _ | packets      |
+	       |_________| \		      /||______________|
+			    \	__________   /
+		 simple     _\||	  | /  encoder
+		 filtergraph   | filtered |/
+			       | frames   |
+			       |__________|
+
+       Simple filtergraphs are configured with the per-stream -filter option
+       (with -vf and -af aliases for video and audio respectively).  A simple
+       filtergraph for video can look for example like this:
+
+		_______        _____________	    _______	   ________
+	       |       |      | 	    |	   |	   |	  |	   |
+	       | input | ---> | deinterlace | ---> | scale | ---> | output |
+	       |_______|      |_____________|	   |_______|	  |________|
+
+       Note that some filters change frame properties but not frame contents.
+       E.g. the "fps" filter in the example above changes number of frames,
+       but does not touch the frame contents. Another example is the "setpts"
+       filter, which only sets timestamps and otherwise passes the frames
+       unchanged.
+
+       Complex filtergraphs
+
+       Complex filtergraphs are those which cannot be described as simply a
+       linear processing chain applied to one stream. This is the case, for
+       example, when the graph has more than one input and/or output, or when
+       output stream type is different from input. They can be represented
+       with the following diagram:
+
+		_________
+	       |	 |
+	       | input 0 |\		       __________
+	       |_________| \		      | 	 |
+			    \	_________    /| output 0 |
+			     \ |	 |  / |__________|
+		_________     \| complex | /
+	       |	 |     |	 |/
+	       | input 1 |---->| filter  |\
+	       |_________|     |	 | \   __________
+			      /| graph	 |  \ | 	 |
+			     / |	 |   \| output 1 |
+		_________   /  |_________|    |__________|
+	       |	 | /
+	       | input 2 |/
+	       |_________|
+
+       Complex filtergraphs are configured with the -filter_complex option.
+       Note that this option is global, since a complex filtergraph, by its
+       nature, cannot be unambiguously associated with a single stream or
+       file.
+
+       The -lavfi option is equivalent to -filter_complex.
+
+       A trivial example of a complex filtergraph is the "overlay" filter,
+       which has two video inputs and one video output, containing one video
+       overlaid on top of the other. Its audio counterpart is the "amix"
+       filter.
+
+   Stream copy
+       Stream copy is a mode selected by supplying the "copy" parameter to the
+       -codec option. It makes ffmpeg omit the decoding and encoding step for
+       the specified stream, so it does only demuxing and muxing. It is useful
+       for changing the container format or modifying container-level
+       metadata. The diagram above will, in this case, simplify to this:
+
+		_______ 	     ______________	       ________
+	       |       |	    |		   |	      |        |
+	       | input |  demuxer   | encoded data |  muxer   | output |
+	       | file  | ---------> | packets	   | -------> | file   |
+	       |_______|	    |______________|	      |________|
+
+       Since there is no decoding or encoding, it is very fast and there is no
+       quality loss. However, it might not work in some cases because of many
+       factors. Applying filters is obviously also impossible, since filters
+       work on uncompressed data.
+
+   Loopback decoders
+       While decoders are normally associated with demuxer streams, it is also
+       possible to create "loopback" decoders that decode the output from some
+       encoder and allow it to be fed back to complex filtergraphs. This is
+       done with the "-dec" directive, which takes as a parameter the index of
+       the output stream that should be decoded. Every such directive creates
+       a new loopback decoder, indexed with successive integers starting at
+       zero. These indices should then be used to refer to loopback decoders
+       in complex filtergraph link labels, as described in the documentation
+       for -filter_complex.
+
+       E.g. the following example:
+
+	       ffmpeg -i INPUT					      \
+		 -map 0:v:0 -c:v libx264 -crf 45 -f null -	      \
+		 -dec 0:0 -filter_complex '[0:v][dec:0]hstack[stack]' \
+		 -map '[stack]' -c:v ffv1 OUTPUT
+
+       reads an input video and
+
+       o   (line 2) encodes it with "libx264" at low quality;
+
+       o   (line 3) decodes this encoded stream and places it side by side
+	   with the original input video;
+
+       o   (line 4) combined video is then losslessly encoded and written into
+	   OUTPUT.
+
+STREAM SELECTION
+       ffmpeg provides the "-map" option for manual control of stream
+       selection in each output file. Users can skip "-map" and let ffmpeg
+       perform automatic stream selection as described below. The "-vn / -an /
+       -sn / -dn" options can be used to skip inclusion of video, audio,
+       subtitle and data streams respectively, whether manually mapped or
+       automatically selected, except for those streams which are outputs of
+       complex filtergraphs.
+
+   Description
+       The sub-sections that follow describe the various rules that are
+       involved in stream selection.  The examples that follow next show how
+       these rules are applied in practice.
+
+       While every effort is made to accurately reflect the behavior of the
+       program, FFmpeg is under continuous development and the code may have
+       changed since the time of this writing.
+
+       Automatic stream selection
+
+       In the absence of any map options for a particular output file, ffmpeg
+       inspects the output format to check which type of streams can be
+       included in it, viz. video, audio and/or subtitles. For each acceptable
+       stream type, ffmpeg will pick one stream, when available, from among
+       all the inputs.
+
+       It will select that stream based upon the following criteria:
+
+       o   for video, it is the stream with the highest resolution,
+
+       o   for audio, it is the stream with the most channels,
+
+       o   for subtitles, it is the first subtitle stream found but there's a
+	   caveat.  The output format's default subtitle encoder can be either
+	   text-based or image-based, and only a subtitle stream of the same
+	   type will be chosen.
+
+       In the case where several streams of the same type rate equally, the
+       stream with the lowest index is chosen.
+
+       Data or attachment streams are not automatically selected and can only
+       be included using "-map".
+
+       Manual stream selection
+
+       When "-map" is used, only user-mapped streams are included in that
+       output file, with one possible exception for filtergraph outputs
+       described below.
+
+       Complex filtergraphs
+
+       If there are any complex filtergraph output streams with unlabeled
+       pads, they will be added to the first output file. This will lead to a
+       fatal error if the stream type is not supported by the output format.
+       In the absence of the map option, the inclusion of these streams leads
+       to the automatic stream selection of their types being skipped. If map
+       options are present, these filtergraph streams are included in addition
+       to the mapped streams.
+
+       Complex filtergraph output streams with labeled pads must be mapped
+       once and exactly once.
+
+       Stream handling
+
+       Stream handling is independent of stream selection, with an exception
+       for subtitles described below. Stream handling is set via the "-codec"
+       option addressed to streams within a specific output file. In
+       particular, codec options are applied by ffmpeg after the stream
+       selection process and thus do not influence the latter. If no "-codec"
+       option is specified for a stream type, ffmpeg will select the default
+       encoder registered by the output file muxer.
+
+       An exception exists for subtitles. If a subtitle encoder is specified
+       for an output file, the first subtitle stream found of any type, text
+       or image, will be included. ffmpeg does not validate if the specified
+       encoder can convert the selected stream or if the converted stream is
+       acceptable within the output format. This applies generally as well:
+       when the user sets an encoder manually, the stream selection process
+       cannot check if the encoded stream can be muxed into the output file.
+       If it cannot, ffmpeg will abort and all output files will fail to be
+       processed.
+
+   Examples
+       The following examples illustrate the behavior, quirks and limitations
+       of ffmpeg's stream selection methods.
+
+       They assume the following three input files.
+
+	       input file 'A.avi'
+		     stream 0: video 640x360
+		     stream 1: audio 2 channels
+
+	       input file 'B.mp4'
+		     stream 0: video 1920x1080
+		     stream 1: audio 2 channels
+		     stream 2: subtitles (text)
+		     stream 3: audio 5.1 channels
+		     stream 4: subtitles (text)
+
+	       input file 'C.mkv'
+		     stream 0: video 1280x720
+		     stream 1: audio 2 channels
+		     stream 2: subtitles (image)
+
+       Example: automatic stream selection
+
+	       ffmpeg -i A.avi -i B.mp4 out1.mkv out2.wav -map 1:a -c:a copy out3.mov
+
+       There are three output files specified, and for the first two, no
+       "-map" options are set, so ffmpeg will select streams for these two
+       files automatically.
+
+       out1.mkv is a Matroska container file and accepts video, audio and
+       subtitle streams, so ffmpeg will try to select one of each type.For
+       video, it will select "stream 0" from B.mp4, which has the highest
+       resolution among all the input video streams.For audio, it will select
+       "stream 3" from B.mp4, since it has the greatest number of channels.For
+       subtitles, it will select "stream 2" from B.mp4, which is the first
+       subtitle stream from among A.avi and B.mp4.
+
+       out2.wav accepts only audio streams, so only "stream 3" from B.mp4 is
+       selected.
+
+       For out3.mov, since a "-map" option is set, no automatic stream
+       selection will occur. The "-map 1:a" option will select all audio
+       streams from the second input B.mp4. No other streams will be included
+       in this output file.
+
+       For the first two outputs, all included streams will be transcoded. The
+       encoders chosen will be the default ones registered by each output
+       format, which may not match the codec of the selected input streams.
+
+       For the third output, codec option for audio streams has been set to
+       "copy", so no decoding-filtering-encoding operations will occur, or can
+       occur.  Packets of selected streams shall be conveyed from the input
+       file and muxed within the output file.
+
+       Example: automatic subtitles selection
+
+	       ffmpeg -i C.mkv out1.mkv -c:s dvdsub -an out2.mkv
+
+       Although out1.mkv is a Matroska container file which accepts subtitle
+       streams, only a video and audio stream shall be selected. The subtitle
+       stream of C.mkv is image-based and the default subtitle encoder of the
+       Matroska muxer is text-based, so a transcode operation for the
+       subtitles is expected to fail and hence the stream isn't selected.
+       However, in out2.mkv, a subtitle encoder is specified in the command
+       and so, the subtitle stream is selected, in addition to the video
+       stream. The presence of "-an" disables audio stream selection for
+       out2.mkv.
+
+       Example: unlabeled filtergraph outputs
+
+	       ffmpeg -i A.avi -i C.mkv -i B.mp4 -filter_complex "overlay" out1.mp4 out2.srt
+
+       A filtergraph is setup here using the "-filter_complex" option and
+       consists of a single video filter. The "overlay" filter requires
+       exactly two video inputs, but none are specified, so the first two
+       available video streams are used, those of A.avi and C.mkv. The output
+       pad of the filter has no label and so is sent to the first output file
+       out1.mp4. Due to this, automatic selection of the video stream is
+       skipped, which would have selected the stream in B.mp4. The audio
+       stream with most channels viz. "stream 3" in B.mp4, is chosen
+       automatically. No subtitle stream is chosen however, since the MP4
+       format has no default subtitle encoder registered, and the user hasn't
+       specified a subtitle encoder.
+
+       The 2nd output file, out2.srt, only accepts text-based subtitle
+       streams. So, even though the first subtitle stream available belongs to
+       C.mkv, it is image-based and hence skipped.  The selected stream,
+       "stream 2" in B.mp4, is the first text-based subtitle stream.
+
+       Example: labeled filtergraph outputs
+
+	       ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0[outv];overlay;aresample" \
+		      -map '[outv]' -an        out1.mp4 \
+					       out2.mkv \
+		      -map '[outv]' -map 1:a:0 out3.mkv
+
+       The above command will fail, as the output pad labelled "[outv]" has
+       been mapped twice.  None of the output files shall be processed.
+
+	       ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0[outv];overlay;aresample" \
+		      -an	 out1.mp4 \
+				 out2.mkv \
+		      -map 1:a:0 out3.mkv
+
+       This command above will also fail as the hue filter output has a label,
+       "[outv]", and hasn't been mapped anywhere.
+
+       The command should be modified as follows,
+
+	       ffmpeg -i A.avi -i B.mp4 -i C.mkv -filter_complex "[1:v]hue=s=0,split=2[outv1][outv2];overlay;aresample" \
+		       -map '[outv1]' -an	 out1.mp4 \
+						 out2.mkv \
+		       -map '[outv2]' -map 1:a:0 out3.mkv
+
+       The video stream from B.mp4 is sent to the hue filter, whose output is
+       cloned once using the split filter, and both outputs labelled. Then a
+       copy each is mapped to the first and third output files.
+
+       The overlay filter, requiring two video inputs, uses the first two
+       unused video streams. Those are the streams from A.avi and C.mkv. The
+       overlay output isn't labelled, so it is sent to the first output file
+       out1.mp4, regardless of the presence of the "-map" option.
+
+       The aresample filter is sent the first unused audio stream, that of
+       A.avi. Since this filter output is also unlabelled, it too is mapped to
+       the first output file. The presence of "-an" only suppresses automatic
+       or manual stream selection of audio streams, not outputs sent from
+       filtergraphs. Both these mapped streams shall be ordered before the
+       mapped stream in out1.mp4.
+
+       The video, audio and subtitle streams mapped to "out2.mkv" are entirely
+       determined by automatic stream selection.
+
+       out3.mkv consists of the cloned video output from the hue filter and
+       the first audio stream from B.mp4.
+
+OPTIONS
+       All the numerical options, if not specified otherwise, accept a string
+       representing a number as input, which may be followed by one of the SI
+       unit prefixes, for example: 'K', 'M', or 'G'.
+
+       If 'i' is appended to the SI unit prefix, the complete prefix will be
+       interpreted as a unit prefix for binary multiples, which are based on
+       powers of 1024 instead of powers of 1000. Appending 'B' to the SI unit
+       prefix multiplies the value by 8. This allows using, for example: 'KB',
+       'MiB', 'G' and 'B' as number suffixes.
+
+       Options which do not take arguments are boolean options, and set the
+       corresponding value to true. They can be set to false by prefixing the
+       option name with "no". For example using "-nofoo" will set the boolean
+       option with name "foo" to false.
+
+       Options that take arguments support a special syntax where the argument
+       given on the command line is interpreted as a path to the file from
+       which the actual argument value is loaded. To use this feature, add a
+       forward slash '/' immediately before the option name (after the leading
+       dash). E.g.
+
+	       ffmpeg -i INPUT -/filter:v filter.script OUTPUT
+
+       will load a filtergraph description from the file named filter.script.
+
+   Stream specifiers
+       Some options are applied per-stream, e.g. bitrate or codec. Stream
+       specifiers are used to precisely specify which stream(s) a given option
+       belongs to.
+
+       A stream specifier is a string generally appended to the option name
+       and separated from it by a colon. E.g. "-codec:a:1 ac3" contains the
+       "a:1" stream specifier, which matches the second audio stream.
+       Therefore, it would select the ac3 codec for the second audio stream.
+
+       A stream specifier can match several streams, so that the option is
+       applied to all of them. E.g. the stream specifier in "-b:a 128k"
+       matches all audio streams.
+
+       An empty stream specifier matches all streams. For example, "-codec
+       copy" or "-codec: copy" would copy all the streams without reencoding.
+
+       Possible forms of stream specifiers are:
+
+       stream_index
+	   Matches the stream with this index. E.g. "-threads:1 4" would set
+	   the thread count for the second stream to 4. If stream_index is
+	   used as an additional stream specifier (see below), then it selects
+	   stream number stream_index from the matching streams. Stream
+	   numbering is based on the order of the streams as detected by
+	   libavformat except when a stream group specifier or program ID is
+	   also specified. In this case it is based on the ordering of the
+	   streams in the group or program.
+
+       stream_type[:additional_stream_specifier]
+	   stream_type is one of following: 'v' or 'V' for video, 'a' for
+	   audio, 's' for subtitle, 'd' for data, and 't' for attachments. 'v'
+	   matches all video streams, 'V' only matches video streams which are
+	   not attached pictures, video thumbnails or cover arts. If
+	   additional_stream_specifier is used, then it matches streams which
+	   both have this type and match the additional_stream_specifier.
+	   Otherwise, it matches all streams of the specified type.
+
+       g:group_specifier[:additional_stream_specifier]
+	   Matches streams which are in the group with the specifier
+	   group_specifier.  if additional_stream_specifier is used, then it
+	   matches streams which both are part of the group and match the
+	   additional_stream_specifier.  group_specifier may be one of the
+	   following:
+
+	   group_index
+	       Match the stream with this group index.
+
+	   #group_id or i:group_id
+	       Match the stream with this group id.
+
+       p:program_id[:additional_stream_specifier]
+	   Matches streams which are in the program with the id program_id. If
+	   additional_stream_specifier is used, then it matches streams which
+	   both are part of the program and match the
+	   additional_stream_specifier.
+
+       #stream_id or i:stream_id
+	   Match the stream by stream id (e.g. PID in MPEG-TS container).
+
+       m:key[:value]
+	   Matches streams with the metadata tag key having the specified
+	   value. If value is not given, matches streams that contain the
+	   given tag with any value.
+
+       u   Matches streams with usable configuration, the codec must be
+	   defined and the essential information such as video dimension or
+	   audio sample rate must be present.
+
+	   Note that in ffmpeg, matching by metadata will only work properly
+	   for input files.
+
+   Generic options
+       These options are shared amongst the ff* tools.
+
+       -L  Show license.
+
+       -h, -?, -help, --help [arg]
+	   Show help. An optional parameter may be specified to print help
+	   about a specific item. If no argument is specified, only basic (non
+	   advanced) tool options are shown.
+
+	   Possible values of arg are:
+
+	   long
+	       Print advanced tool options in addition to the basic tool
+	       options.
+
+	   full
+	       Print complete list of options, including shared and private
+	       options for encoders, decoders, demuxers, muxers, filters, etc.
+
+	   decoder=decoder_name
+	       Print detailed information about the decoder named
+	       decoder_name. Use the -decoders option to get a list of all
+	       decoders.
+
+	   encoder=encoder_name
+	       Print detailed information about the encoder named
+	       encoder_name. Use the -encoders option to get a list of all
+	       encoders.
+
+	   demuxer=demuxer_name
+	       Print detailed information about the demuxer named
+	       demuxer_name. Use the -formats option to get a list of all
+	       demuxers and muxers.
+
+	   muxer=muxer_name
+	       Print detailed information about the muxer named muxer_name.
+	       Use the -formats option to get a list of all muxers and
+	       demuxers.
+
+	   filter=filter_name
+	       Print detailed information about the filter named filter_name.
+	       Use the -filters option to get a list of all filters.
+
+	   bsf=bitstream_filter_name
+	       Print detailed information about the bitstream filter named
+	       bitstream_filter_name.  Use the -bsfs option to get a list of
+	       all bitstream filters.
+
+	   protocol=protocol_name
+	       Print detailed information about the protocol named
+	       protocol_name.  Use the -protocols option to get a list of all
+	       protocols.
+
+       -version
+	   Show version.
+
+       -buildconf
+	   Show the build configuration, one option per line.
+
+       -formats
+	   Show available formats (including devices).
+
+       -demuxers
+	   Show available demuxers.
+
+       -muxers
+	   Show available muxers.
+
+       -devices
+	   Show available devices.
+
+       -codecs
+	   Show all codecs known to libavcodec.
+
+	   Note that the term 'codec' is used throughout this documentation as
+	   a shortcut for what is more correctly called a media bitstream
+	   format.
+
+       -decoders
+	   Show available decoders.
+
+       -encoders
+	   Show all available encoders.
+
+       -bsfs
+	   Show available bitstream filters.
+
+       -protocols
+	   Show available protocols.
+
+       -filters
+	   Show available libavfilter filters.
+
+       -pix_fmts
+	   Show available pixel formats.
+
+       -sample_fmts
+	   Show available sample formats.
+
+       -layouts
+	   Show channel names and standard channel layouts.
+
+       -dispositions
+	   Show stream dispositions.
+
+       -colors
+	   Show recognized color names.
+
+       -sources device[,opt1=val1[,opt2=val2]...]
+	   Show autodetected sources of the input device.  Some devices may
+	   provide system-dependent source names that cannot be autodetected.
+	   The returned list cannot be assumed to be always complete.
+
+		   ffmpeg -sources pulse,server=192.168.0.4
+
+       -sinks device[,opt1=val1[,opt2=val2]...]
+	   Show autodetected sinks of the output device.  Some devices may
+	   provide system-dependent sink names that cannot be autodetected.
+	   The returned list cannot be assumed to be always complete.
+
+		   ffmpeg -sinks pulse,server=192.168.0.4
+
+       -loglevel [flags+]loglevel | -v [flags+]loglevel
+	   Set logging level and flags used by the library.
+
+	   The optional flags prefix can consist of the following values:
+
+	   repeat
+	       Indicates that repeated log output should not be compressed to
+	       the first line and the "Last message repeated n times" line
+	       will be omitted.
+
+	   level
+	       Indicates that log output should add a "[level]" prefix to each
+	       message line. This can be used as an alternative to log
+	       coloring, e.g. when dumping the log to file.
+
+	   Flags can also be used alone by adding a '+'/'-' prefix to
+	   set/reset a single flag without affecting other flags or changing
+	   loglevel. When setting both flags and loglevel, a '+' separator is
+	   expected between the last flags value and before loglevel.
+
+	   loglevel is a string or a number containing one of the following
+	   values:
+
+	   quiet, -8
+	       Show nothing at all; be silent.
+
+	   panic, 0
+	       Only show fatal errors which could lead the process to crash,
+	       such as an assertion failure. This is not currently used for
+	       anything.
+
+	   fatal, 8
+	       Only show fatal errors. These are errors after which the
+	       process absolutely cannot continue.
+
+	   error, 16
+	       Show all errors, including ones which can be recovered from.
+
+	   warning, 24
+	       Show all warnings and errors. Any message related to possibly
+	       incorrect or unexpected events will be shown.
+
+	   info, 32
+	       Show informative messages during processing. This is in
+	       addition to warnings and errors. This is the default value.
+
+	   verbose, 40
+	       Same as "info", except more verbose.
+
+	   debug, 48
+	       Show everything, including debugging information.
+
+	   trace, 56
+
+	   For example to enable repeated log output, add the "level" prefix,
+	   and set loglevel to "verbose":
+
+		   ffmpeg -loglevel repeat+level+verbose -i input output
+
+	   Another example that enables repeated log output without affecting
+	   current state of "level" prefix flag or loglevel:
+
+		   ffmpeg [...] -loglevel +repeat
+
+	   By default the program logs to stderr. If coloring is supported by
+	   the terminal, colors are used to mark errors and warnings. Log
+	   coloring can be disabled setting the environment variable
+	   AV_LOG_FORCE_NOCOLOR, or can be forced setting the environment
+	   variable AV_LOG_FORCE_COLOR.
+
+       -report
+	   Dump full command line and log output to a file named
+	   "program-YYYYMMDD-HHMMSS.log" in the current directory.  This file
+	   can be useful for bug reports.  It also implies "-loglevel debug".
+
+	   Setting the environment variable FFREPORT to any value has the same
+	   effect. If the value is a ':'-separated key=value sequence, these
+	   options will affect the report; option values must be escaped if
+	   they contain special characters or the options delimiter ':' (see
+	   the ``Quoting and escaping'' section in the ffmpeg-utils manual).
+
+	   The following options are recognized:
+
+	   file
+	       set the file name to use for the report; %p is expanded to the
+	       name of the program, %t is expanded to a timestamp, "%%" is
+	       expanded to a plain "%"
+
+	   level
+	       set the log verbosity level using a numerical value (see
+	       "-loglevel").
+
+	   For example, to output a report to a file named ffreport.log using
+	   a log level of 32 (alias for log level "info"):
+
+		   FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output
+
+	   Errors in parsing the environment variable are not fatal, and will
+	   not appear in the report.
+
+       -hide_banner
+	   Suppress printing banner.
+
+	   All FFmpeg tools will normally show a copyright notice, build
+	   options and library versions. This option can be used to suppress
+	   printing this information.
+
+       -cpuflags flags (global)
+	   Allows setting and clearing cpu flags. This option is intended for
+	   testing. Do not use it unless you know what you're doing.
+
+		   ffmpeg -cpuflags -sse+mmx ...
+		   ffmpeg -cpuflags mmx ...
+		   ffmpeg -cpuflags 0 ...
+
+	   Possible flags for this option are:
+
+	   x86
+	       mmx
+	       mmxext
+	       sse
+	       sse2
+	       sse2slow
+	       sse3
+	       sse3slow
+	       ssse3
+	       atom
+	       sse4.1
+	       sse4.2
+	       avx
+	       avx2
+	       xop
+	       fma3
+	       fma4
+	       3dnow
+	       3dnowext
+	       bmi1
+	       bmi2
+	       cmov
+	   ARM
+	       armv5te
+	       armv6
+	       armv6t2
+	       vfp
+	       vfpv3
+	       neon
+	       setend
+	   AArch64
+	       armv8
+	       vfp
+	       neon
+	   PowerPC
+	       altivec
+	   Specific Processors
+	       pentium2
+	       pentium3
+	       pentium4
+	       k6
+	       k62
+	       athlon
+	       athlonxp
+	       k8
+       -cpucount count (global)
+	   Override detection of CPU count. This option is intended for
+	   testing. Do not use it unless you know what you're doing.
+
+		   ffmpeg -cpucount 2
+
+       -max_alloc bytes
+	   Set the maximum size limit for allocating a block on the heap by
+	   ffmpeg's family of malloc functions. Exercise extreme caution when
+	   using this option. Don't use if you do not understand the full
+	   consequence of doing so.  Default is INT_MAX.
+
+   AVOptions
+       These options are provided directly by the libavformat, libavdevice and
+       libavcodec libraries. To see the list of available AVOptions, use the
+       -help option. They are separated into two categories:
+
+       generic
+	   These options can be set for any container, codec or device.
+	   Generic options are listed under AVFormatContext options for
+	   containers/devices and under AVCodecContext options for codecs.
+
+       private
+	   These options are specific to the given container, device or codec.
+	   Private options are listed under their corresponding
+	   containers/devices/codecs.
+
+       For example to write an ID3v2.3 header instead of a default ID3v2.4 to
+       an MP3 file, use the id3v2_version private option of the MP3 muxer:
+
+	       ffmpeg -i input.flac -id3v2_version 3 out.mp3
+
+       All codec AVOptions are per-stream, and thus a stream specifier should
+       be attached to them:
+
+	       ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
+
+       In the above example, a multichannel audio stream is mapped twice for
+       output.	The first instance is encoded with codec ac3 and bitrate 640k.
+       The second instance is downmixed to 2 channels and encoded with codec
+       aac. A bitrate of 128k is specified for it using absolute index of the
+       output stream.
+
+       Note: the -nooption syntax cannot be used for boolean AVOptions, use
+       -option 0/-option 1.
+
+       Note: the old undocumented way of specifying per-stream AVOptions by
+       prepending v/a/s to the options name is now obsolete and will be
+       removed soon.
+
+   Main options
+       -f fmt (input/output)
+	   Force input or output file format. The format is normally auto
+	   detected for input files and guessed from the file extension for
+	   output files, so this option is not needed in most cases.
+
+       -i url (input)
+	   input file url
+
+       -y (global)
+	   Overwrite output files without asking.
+
+       -n (global)
+	   Do not overwrite output files, and exit immediately if a specified
+	   output file already exists.
+
+       -stream_loop number (input)
+	   Set number of times input stream shall be looped. Loop 0 means no
+	   loop, loop -1 means infinite loop.
+
+       -recast_media (global)
+	   Allow forcing a decoder of a different media type than the one
+	   detected or designated by the demuxer. Useful for decoding media
+	   data muxed as data streams.
+
+       -c[:stream_specifier] codec (input/output,per-stream)
+       -codec[:stream_specifier] codec (input/output,per-stream)
+	   Select an encoder (when used before an output file) or a decoder
+	   (when used before an input file) for one or more streams. codec is
+	   the name of a decoder/encoder or a special value "copy" (output
+	   only) to indicate that the stream is not to be re-encoded.
+
+	   For example
+
+		   ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
+
+	   encodes all video streams with libx264 and copies all audio
+	   streams.
+
+	   For each stream, the last matching "c" option is applied, so
+
+		   ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
+
+	   will copy all the streams except the second video, which will be
+	   encoded with libx264, and the 138th audio, which will be encoded
+	   with libvorbis.
+
+       -t duration (input/output)
+	   When used as an input option (before "-i"), limit the duration of
+	   data read from the input file.
+
+	   When used as an output option (before an output url), stop writing
+	   the output after its duration reaches duration.
+
+	   duration must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.
+
+	   -to and -t are mutually exclusive and -t has priority.
+
+       -to position (input/output)
+	   Stop writing the output or reading the input at position.  position
+	   must be a time duration specification, see the Time duration
+	   section in the ffmpeg-utils(1) manual.
+
+	   -to and -t are mutually exclusive and -t has priority.
+
+       -fs limit_size (output)
+	   Set the file size limit, expressed in bytes. No further chunk of
+	   bytes is written after the limit is exceeded. The size of the
+	   output file is slightly more than the requested file size.
+
+       -ss position (input/output)
+	   When used as an input option (before "-i"), seeks in this input
+	   file to position. Note that in most formats it is not possible to
+	   seek exactly, so ffmpeg will seek to the closest seek point before
+	   position.  When transcoding and -accurate_seek is enabled (the
+	   default), this extra segment between the seek point and position
+	   will be decoded and discarded. When doing stream copy or when
+	   -noaccurate_seek is used, it will be preserved.
+
+	   When used as an output option (before an output url), decodes but
+	   discards input until the timestamps reach position.
+
+	   position must be a time duration specification, see the Time
+	   duration section in the ffmpeg-utils(1) manual.
+
+       -sseof position (input)
+	   Like the "-ss" option but relative to the "end of file". That is
+	   negative values are earlier in the file, 0 is at EOF.
+
+       -isync input_index (input)
+	   Assign an input as a sync source.
+
+	   This will take the difference between the start times of the target
+	   and reference inputs and offset the timestamps of the target file
+	   by that difference. The source timestamps of the two inputs should
+	   derive from the same clock source for expected results. If "copyts"
+	   is set then "start_at_zero" must also be set. If either of the
+	   inputs has no starting timestamp then no sync adjustment is made.
+
+	   Acceptable values are those that refer to a valid ffmpeg input
+	   index. If the sync reference is the target index itself or -1, then
+	   no adjustment is made to target timestamps. A sync reference may
+	   not itself be synced to any other input.
+
+	   Default value is -1.
+
+       -itsoffset offset (input)
+	   Set the input time offset.
+
+	   offset must be a time duration specification, see the Time duration
+	   section in the ffmpeg-utils(1) manual.
+
+	   The offset is added to the timestamps of the input files.
+	   Specifying a positive offset means that the corresponding streams
+	   are delayed by the time duration specified in offset.
+
+       -itsscale scale (input,per-stream)
+	   Rescale input timestamps. scale should be a floating point number.
+
+       -timestamp date (output)
+	   Set the recording timestamp in the container.
+
+	   date must be a date specification, see the Date section in the
+	   ffmpeg-utils(1) manual.
+
+       -metadata[:metadata_specifier] key=value (output,per-metadata)
+	   Set a metadata key/value pair.
+
+	   An optional metadata_specifier may be given to set metadata on
+	   streams, chapters or programs. See "-map_metadata" documentation
+	   for details.
+
+	   This option overrides metadata set with "-map_metadata". It is also
+	   possible to delete metadata by using an empty value.
+
+	   For example, for setting the title in the output file:
+
+		   ffmpeg -i in.avi -metadata title="my title" out.flv
+
+	   To set the language of the first audio stream:
+
+		   ffmpeg -i INPUT -metadata:s:a:0 language=eng OUTPUT
+
+       -disposition[:stream_specifier] value (output,per-stream)
+	   Sets the disposition for a stream.
+
+	   By default, the disposition is copied from the input stream, unless
+	   the output stream this option applies to is fed by a complex
+	   filtergraph - in that case the disposition is unset by default.
+
+	   value is a sequence of items separated by '+' or '-'. The first
+	   item may also be prefixed with '+' or '-', in which case this
+	   option modifies the default value. Otherwise (the first item is not
+	   prefixed) this options overrides the default value. A '+' prefix
+	   adds the given disposition, '-' removes it. It is also possible to
+	   clear the disposition by setting it to 0.
+
+	   If no "-disposition" options were specified for an output file,
+	   ffmpeg will automatically set the 'default' disposition on the
+	   first stream of each type, when there are multiple streams of this
+	   type in the output file and no stream of that type is already
+	   marked as default.
+
+	   The "-dispositions" option lists the known dispositions.
+
+	   For example, to make the second audio stream the default stream:
+
+		   ffmpeg -i in.mkv -c copy -disposition:a:1 default out.mkv
+
+	   To make the second subtitle stream the default stream and remove
+	   the default disposition from the first subtitle stream:
+
+		   ffmpeg -i in.mkv -c copy -disposition:s:0 0 -disposition:s:1 default out.mkv
+
+	   To add an embedded cover/thumbnail:
+
+		   ffmpeg -i in.mp4 -i IMAGE -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attached_pic out.mp4
+
+	   Not all muxers support embedded thumbnails, and those who do, only
+	   support a few formats, like JPEG or PNG.
+
+       -program
+       [title=title:][program_num=program_num:]st=stream[:st=stream...]
+       (output)
+	   Creates a program with the specified title, program_num and adds
+	   the specified stream(s) to it.
+
+       -stream_group
+       type=type:st=stream[:st=stream][:stg=stream_group][:id=stream_group_id...]
+       (output)
+	   Creates a stream group of the specified type, stream_group_id and
+	   adds the specified stream(s) and/or previously defined
+	   stream_group(s) to it.
+
+	   type can be one of the following:
+
+	   iamf_audio_element
+	       Groups streams that belong to the same IAMF Audio Element
+
+	       For this group type, the following options are available
+
+	       audio_element_type
+		   The Audio Element type. The following values are supported:
+
+		   channel
+		       Scalable channel audio representation
+
+		   scene
+		       Ambisonics representation
+
+	       demixing
+		   Demixing information used to reconstruct a scalable channel
+		   audio representation.  This option must be separated from
+		   the rest with a ',', and takes the following key=value
+		   options
+
+		   parameter_id
+		       An identifier parameters blocks in frames may refer to
+
+		   dmixp_mode
+		       A pre-defined combination of demixing parameters
+
+	       recon_gain
+		   Recon gain information used to reconstruct a scalable
+		   channel audio representation.  This option must be
+		   separated from the rest with a ',', and takes the following
+		   key=value options
+
+		   parameter_id
+		       An identifier parameters blocks in frames may refer to
+
+	       layer
+		   A layer defining a Channel Layout in the Audio Element.
+		   This option must be separated from the rest with a ','.
+		   Several ',' separated entries can be defined, and at least
+		   one must be set.
+
+		   It takes the following ":"-separated key=value options
+
+		   ch_layout
+		       The layer's channel layout
+
+		   flags
+		       The following flags are available:
+
+		       recon_gain
+			   Wether to signal if recon_gain is present as
+			   metadata in parameter blocks within frames
+
+		   output_gain
+		   output_gain_flags
+		       Which channels output_gain applies to. The following
+		       flags are available:
+
+		       FL
+		       FR
+		       BL
+		       BR
+		       TFL
+		       TFR
+		   ambisonics_mode
+		       The ambisonics mode. This has no effect if
+		       audio_element_type is set to channel.
+
+		       The following values are supported:
+
+		       mono
+			   Each ambisonics channel is coded as an individual
+			   mono stream in the group
+
+	       default_w
+		   Default weight value
+
+	   iamf_mix_presentation
+	       Groups streams that belong to all IAMF Audio Element the same
+	       IAMF Mix Presentation references
+
+	       For this group type, the following options are available
+
+	       submix
+		   A sub-mix within the Mix Presentation.  This option must be
+		   separated from the rest with a ','. Several ',' separated
+		   entries can be defined, and at least one must be set.
+
+		   It takes the following ":"-separated key=value options
+
+		   parameter_id
+		       An identifier parameters blocks in frames may refer to,
+		       for post-processing the mixed audio signal to generate
+		       the audio signal for playback
+
+		   parameter_rate
+		       The sample rate duration fields in parameters blocks in
+		       frames that refer to this parameter_id are expressed as
+
+		   default_mix_gain
+		       Default mix gain value to apply when there are no
+		       parameter blocks sharing the same parameter_id for a
+		       given frame
+
+		   element
+		       References an Audio Element used in this Mix
+		       Presentation to generate the final output audio signal
+		       for playback.  This option must be separated from the
+		       rest with a '|'. Several '|' separated entries can be
+		       defined, and at least one must be set.
+
+		       It takes the following ":"-separated key=value options:
+
+		       stg The stream_group_id for an Audio Element which this
+			   sub-mix refers to
+
+		       parameter_id
+			   An identifier parameters blocks in frames may refer
+			   to, for applying any processing to the referenced
+			   and rendered Audio Element before being summed with
+			   other processed Audio Elements
+
+		       parameter_rate
+			   The sample rate duration fields in parameters
+			   blocks in frames that refer to this parameter_id
+			   are expressed as
+
+		       default_mix_gain
+			   Default mix gain value to apply when there are no
+			   parameter blocks sharing the same parameter_id for
+			   a given frame
+
+		       annotations
+			   A key=value string describing the sub-mix element
+			   where "key" is a string conforming to BCP-47 that
+			   specifies the language for the "value" string.
+			   "key" must be the same as the one in the mix's
+			   annotations
+
+		       headphones_rendering_mode
+			   Indicates whether the input channel-based Audio
+			   Element is rendered to stereo loudspeakers or
+			   spatialized with a binaural renderer when played
+			   back on headphones.	This has no effect if the
+			   referenced Audio Element's audio_element_type is
+			   set to channel.
+
+			   The following values are supported:
+
+			   stereo
+			   binaural
+		   layout
+		       Specifies the layouts for this sub-mix on which the
+		       loudness information was measured.  This option must be
+		       separated from the rest with a '|'. Several '|'
+		       separated entries can be defined, and at least one must
+		       be set.
+
+		       It takes the following ":"-separated key=value options:
+
+		       layout_type
+			   loudspeakers
+			       The layout follows the loudspeaker sound system
+			       convention of ITU-2051-3.
+
+			   binaural
+			       The layout is binaural.
+
+		       sound_system
+			   Channel layout matching one of Sound Systems A to J
+			   of ITU-2051-3, plus 7.1.2 and 3.1.2 This has no
+			   effect if layout_type is set to binaural.
+
+		       integrated_loudness
+			   The program integrated loudness information, as
+			   defined in ITU-1770-4.
+
+		       digital_peak
+			   The digital (sampled) peak value of the audio
+			   signal, as defined in ITU-1770-4.
+
+		       true_peak
+			   The true peak of the audio signal, as defined in
+			   ITU-1770-4.
+
+		       dialog_anchored_loudness
+			   The Dialogue loudness information, as defined in
+			   ITU-1770-4.
+
+		       album_anchored_loudness
+			   The Album loudness information, as defined in
+			   ITU-1770-4.
+
+	       annotations
+		   A key=value string string describing the mix where "key" is
+		   a string conforming to BCP-47 that specifies the language
+		   for the "value" string. "key" must be the same as the ones
+		   in all sub-mix element's annotationss
+
+       -target type (output)
+	   Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50"). type
+	   may be prefixed with "pal-", "ntsc-" or "film-" to use the
+	   corresponding standard. All the format options (bitrate, codecs,
+	   buffer sizes) are then set automatically. You can just type:
+
+		   ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
+
+	   Nevertheless you can specify additional options as long as you know
+	   they do not conflict with the standard, as in:
+
+		   ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
+
+	   The parameters set for each target are as follows.
+
+	   VCD
+
+		   <pal>:
+		   -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
+		   -s 352x288 -r 25
+		   -codec:v mpeg1video -g 15 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
+		   -ar 44100 -ac 2
+		   -codec:a mp2 -b:a 224k
+
+		   <ntsc>:
+		   -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
+		   -s 352x240 -r 30000/1001
+		   -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
+		   -ar 44100 -ac 2
+		   -codec:a mp2 -b:a 224k
+
+		   <film>:
+		   -f vcd -muxrate 1411200 -muxpreload 0.44 -packetsize 2324
+		   -s 352x240 -r 24000/1001
+		   -codec:v mpeg1video -g 18 -b:v 1150k -maxrate:v 1150k -minrate:v 1150k -bufsize:v 327680
+		   -ar 44100 -ac 2
+		   -codec:a mp2 -b:a 224k
+
+	   SVCD
+
+		   <pal>:
+		   -f svcd -packetsize 2324
+		   -s 480x576 -pix_fmt yuv420p -r 25
+		   -codec:v mpeg2video -g 15 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
+		   -ar 44100
+		   -codec:a mp2 -b:a 224k
+
+		   <ntsc>:
+		   -f svcd -packetsize 2324
+		   -s 480x480 -pix_fmt yuv420p -r 30000/1001
+		   -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
+		   -ar 44100
+		   -codec:a mp2 -b:a 224k
+
+		   <film>:
+		   -f svcd -packetsize 2324
+		   -s 480x480 -pix_fmt yuv420p -r 24000/1001
+		   -codec:v mpeg2video -g 18 -b:v 2040k -maxrate:v 2516k -minrate:v 0 -bufsize:v 1835008 -scan_offset 1
+		   -ar 44100
+		   -codec:a mp2 -b:a 224k
+
+	   DVD
+
+		   <pal>:
+		   -f dvd -muxrate 10080k -packetsize 2048
+		   -s 720x576 -pix_fmt yuv420p -r 25
+		   -codec:v mpeg2video -g 15 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
+		   -ar 48000
+		   -codec:a ac3 -b:a 448k
+
+		   <ntsc>:
+		   -f dvd -muxrate 10080k -packetsize 2048
+		   -s 720x480 -pix_fmt yuv420p -r 30000/1001
+		   -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
+		   -ar 48000
+		   -codec:a ac3 -b:a 448k
+
+		   <film>:
+		   -f dvd -muxrate 10080k -packetsize 2048
+		   -s 720x480 -pix_fmt yuv420p -r 24000/1001
+		   -codec:v mpeg2video -g 18 -b:v 6000k -maxrate:v 9000k -minrate:v 0 -bufsize:v 1835008
+		   -ar 48000
+		   -codec:a ac3 -b:a 448k
+
+	   DV
+
+		   <pal>:
+		   -f dv
+		   -s 720x576 -pix_fmt yuv420p -r 25
+		   -ar 48000 -ac 2
+
+		   <ntsc>:
+		   -f dv
+		   -s 720x480 -pix_fmt yuv411p -r 30000/1001
+		   -ar 48000 -ac 2
+
+		   <film>:
+		   -f dv
+		   -s 720x480 -pix_fmt yuv411p -r 24000/1001
+		   -ar 48000 -ac 2
+
+	   The "dv50" target is identical to the "dv" target except that the
+	   pixel format set is "yuv422p" for all three standards.
+
+	   Any user-set value for a parameter above will override the target
+	   preset value. In that case, the output may not comply with the
+	   target standard.
+
+       -dn (input/output)
+	   As an input option, blocks all data streams of a file from being
+	   filtered or being automatically selected or mapped for any output.
+	   See "-discard" option to disable streams individually.
+
+	   As an output option, disables data recording i.e. automatic
+	   selection or mapping of any data stream. For full manual control
+	   see the "-map" option.
+
+       -dframes number (output)
+	   Set the number of data frames to output. This is an obsolete alias
+	   for "-frames:d", which you should use instead.
+
+       -frames[:stream_specifier] framecount (output,per-stream)
+	   Stop writing to the stream after framecount frames.
+
+       -q[:stream_specifier] q (output,per-stream)
+       -qscale[:stream_specifier] q (output,per-stream)
+	   Use fixed quality scale (VBR). The meaning of q/qscale is codec-
+	   dependent.  If qscale is used without a stream_specifier then it
+	   applies only to the video stream, this is to maintain compatibility
+	   with previous behavior and as specifying the same codec specific
+	   value to 2 different codecs that is audio and video generally is
+	   not what is intended when no stream_specifier is used.
+
+       -filter[:stream_specifier] filtergraph (output,per-stream)
+	   Create the filtergraph specified by filtergraph and use it to
+	   filter the stream.
+
+	   filtergraph is a description of the filtergraph to apply to the
+	   stream, and must have a single input and a single output of the
+	   same type of the stream. In the filtergraph, the input is
+	   associated to the label "in", and the output to the label "out".
+	   See the ffmpeg-filters manual for more information about the
+	   filtergraph syntax.
+
+	   See the -filter_complex option if you want to create filtergraphs
+	   with multiple inputs and/or outputs.
+
+       -reinit_filter[:stream_specifier] integer (input,per-stream)
+	   This boolean option determines if the filtergraph(s) to which this
+	   stream is fed gets reinitialized when input frame parameters change
+	   mid-stream. This option is enabled by default as most video and all
+	   audio filters cannot handle deviation in input frame properties.
+	   Upon reinitialization, existing filter state is lost, like e.g. the
+	   frame count "n" reference available in some filters. Any frames
+	   buffered at time of reinitialization are lost.  The properties
+	   where a change triggers reinitialization are, for video, frame
+	   resolution or pixel format; for audio, sample format, sample rate,
+	   channel count or channel layout.
+
+       -filter_threads nb_threads (global)
+	   Defines how many threads are used to process a filter pipeline.
+	   Each pipeline will produce a thread pool with this many threads
+	   available for parallel processing.  The default is the number of
+	   available CPUs.
+
+       -pre[:stream_specifier] preset_name (output,per-stream)
+	   Specify the preset for matching stream(s).
+
+       -stats (global)
+	   Print encoding progress/statistics. It is on by default, to
+	   explicitly disable it you need to specify "-nostats".
+
+       -stats_period time (global)
+	   Set period at which encoding progress/statistics are updated.
+	   Default is 0.5 seconds.
+
+       -progress url (global)
+	   Send program-friendly progress information to url.
+
+	   Progress information is written periodically and at the end of the
+	   encoding process. It is made of "key=value" lines. key consists of
+	   only alphanumeric characters. The last key of a sequence of
+	   progress information is always "progress".
+
+	   The update period is set using "-stats_period".
+
+       -stdin
+	   Enable interaction on standard input. On by default unless standard
+	   input is used as an input. To explicitly disable interaction you
+	   need to specify "-nostdin".
+
+	   Disabling interaction on standard input is useful, for example, if
+	   ffmpeg is in the background process group. Roughly the same result
+	   can be achieved with "ffmpeg ... < /dev/null" but it requires a
+	   shell.
+
+       -debug_ts (global)
+	   Print timestamp/latency information. It is off by default. This
+	   option is mostly useful for testing and debugging purposes, and the
+	   output format may change from one version to another, so it should
+	   not be employed by portable scripts.
+
+	   See also the option "-fdebug ts".
+
+       -attach filename (output)
+	   Add an attachment to the output file. This is supported by a few
+	   formats like Matroska for e.g. fonts used in rendering subtitles.
+	   Attachments are implemented as a specific type of stream, so this
+	   option will add a new stream to the file. It is then possible to
+	   use per-stream options on this stream in the usual way. Attachment
+	   streams created with this option will be created after all the
+	   other streams (i.e. those created with "-map" or automatic
+	   mappings).
+
+	   Note that for Matroska you also have to set the mimetype metadata
+	   tag:
+
+		   ffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv
+
+	   (assuming that the attachment stream will be third in the output
+	   file).
+
+       -dump_attachment[:stream_specifier] filename (input,per-stream)
+	   Extract the matching attachment stream into a file named filename.
+	   If filename is empty, then the value of the "filename" metadata tag
+	   will be used.
+
+	   E.g. to extract the first attachment to a file named 'out.ttf':
+
+		   ffmpeg -dump_attachment:t:0 out.ttf -i INPUT
+
+	   To extract all attachments to files determined by the "filename"
+	   tag:
+
+		   ffmpeg -dump_attachment:t "" -i INPUT
+
+	   Technical note -- attachments are implemented as codec extradata,
+	   so this option can actually be used to extract extradata from any
+	   stream, not just attachments.
+
+   Video Options
+       -vframes number (output)
+	   Set the number of video frames to output. This is an obsolete alias
+	   for "-frames:v", which you should use instead.
+
+       -r[:stream_specifier] fps (input/output,per-stream)
+	   Set frame rate (Hz value, fraction or abbreviation).
+
+	   As an input option, ignore any timestamps stored in the file and
+	   instead generate timestamps assuming constant frame rate fps.  This
+	   is not the same as the -framerate option used for some input
+	   formats like image2 or v4l2 (it used to be the same in older
+	   versions of FFmpeg).  If in doubt use -framerate instead of the
+	   input option -r.
+
+	   As an output option:
+
+	   video encoding
+	       Duplicate or drop frames right before encoding them to achieve
+	       constant output frame rate fps.
+
+	   video streamcopy
+	       Indicate to the muxer that fps is the stream frame rate. No
+	       data is dropped or duplicated in this case. This may produce
+	       invalid files if fps does not match the actual stream frame
+	       rate as determined by packet timestamps.  See also the "setts"
+	       bitstream filter.
+
+       -fpsmax[:stream_specifier] fps (output,per-stream)
+	   Set maximum frame rate (Hz value, fraction or abbreviation).
+
+	   Clamps output frame rate when output framerate is auto-set and is
+	   higher than this value.  Useful in batch processing or when input
+	   framerate is wrongly detected as very high.	It cannot be set
+	   together with "-r". It is ignored during streamcopy.
+
+       -s[:stream_specifier] size (input/output,per-stream)
+	   Set frame size.
+
+	   As an input option, this is a shortcut for the video_size private
+	   option, recognized by some demuxers for which the frame size is
+	   either not stored in the file or is configurable -- e.g. raw video
+	   or video grabbers.
+
+	   As an output option, this inserts the "scale" video filter to the
+	   end of the corresponding filtergraph. Please use the "scale" filter
+	   directly to insert it at the beginning or some other place.
+
+	   The format is wxh (default - same as source).
+
+       -aspect[:stream_specifier] aspect (output,per-stream)
+	   Set the video display aspect ratio specified by aspect.
+
+	   aspect can be a floating point number string, or a string of the
+	   form num:den, where num and den are the numerator and denominator
+	   of the aspect ratio. For example "4:3", "16:9", "1.3333", and
+	   "1.7777" are valid argument values.
+
+	   If used together with -vcodec copy, it will affect the aspect ratio
+	   stored at container level, but not the aspect ratio stored in
+	   encoded frames, if it exists.
+
+       -display_rotation[:stream_specifier] rotation (input,per-stream)
+	   Set video rotation metadata.
+
+	   rotation is a decimal number specifying the amount in degree by
+	   which the video should be rotated counter-clockwise before being
+	   displayed.
+
+	   This option overrides the rotation/display transform metadata
+	   stored in the file, if any. When the video is being transcoded
+	   (rather than copied) and "-autorotate" is enabled, the video will
+	   be rotated at the filtering stage. Otherwise, the metadata will be
+	   written into the output file if the muxer supports it.
+
+	   If the "-display_hflip" and/or "-display_vflip" options are given,
+	   they are applied after the rotation specified by this option.
+
+       -display_hflip[:stream_specifier] (input,per-stream)
+	   Set whether on display the image should be horizontally flipped.
+
+	   See the "-display_rotation" option for more details.
+
+       -display_vflip[:stream_specifier] (input,per-stream)
+	   Set whether on display the image should be vertically flipped.
+
+	   See the "-display_rotation" option for more details.
+
+       -vn (input/output)
+	   As an input option, blocks all video streams of a file from being
+	   filtered or being automatically selected or mapped for any output.
+	   See "-discard" option to disable streams individually.
+
+	   As an output option, disables video recording i.e. automatic
+	   selection or mapping of any video stream. For full manual control
+	   see the "-map" option.
+
+       -vcodec codec (output)
+	   Set the video codec. This is an alias for "-codec:v".
+
+       -pass[:stream_specifier] n (output,per-stream)
+	   Select the pass number (1 or 2). It is used to do two-pass video
+	   encoding. The statistics of the video are recorded in the first
+	   pass into a log file (see also the option -passlogfile), and in the
+	   second pass that log file is used to generate the video at the
+	   exact requested bitrate.  On pass 1, you may just deactivate audio
+	   and set output to null, examples for Windows and Unix:
+
+		   ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
+		   ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
+
+       -passlogfile[:stream_specifier] prefix (output,per-stream)
+	   Set two-pass log file name prefix to prefix, the default file name
+	   prefix is ``ffmpeg2pass''. The complete file name will be
+	   PREFIX-N.log, where N is a number specific to the output stream
+
+       -vf filtergraph (output)
+	   Create the filtergraph specified by filtergraph and use it to
+	   filter the stream.
+
+	   This is an alias for "-filter:v", see the -filter option.
+
+       -autorotate
+	   Automatically rotate the video according to file metadata. Enabled
+	   by default, use -noautorotate to disable it.
+
+       -autoscale
+	   Automatically scale the video according to the resolution of first
+	   frame.  Enabled by default, use -noautoscale to disable it. When
+	   autoscale is disabled, all output frames of filter graph might not
+	   be in the same resolution and may be inadequate for some
+	   encoder/muxer. Therefore, it is not recommended to disable it
+	   unless you really know what you are doing.  Disable autoscale at
+	   your own risk.
+
+   Advanced Video options
+       -pix_fmt[:stream_specifier] format (input/output,per-stream)
+	   Set pixel format. Use "-pix_fmts" to show all the supported pixel
+	   formats.  If the selected pixel format can not be selected, ffmpeg
+	   will print a warning and select the best pixel format supported by
+	   the encoder.  If pix_fmt is prefixed by a "+", ffmpeg will exit
+	   with an error if the requested pixel format can not be selected,
+	   and automatic conversions inside filtergraphs are disabled.	If
+	   pix_fmt is a single "+", ffmpeg selects the same pixel format as
+	   the input (or graph output) and automatic conversions are disabled.
+
+       -sws_flags flags (input/output)
+	   Set default flags for the libswscale library. These flags are used
+	   by automatically inserted "scale" filters and those within simple
+	   filtergraphs, if not overridden within the filtergraph definition.
+
+	   See the ffmpeg-scaler manual for a list of scaler options.
+
+       -rc_override[:stream_specifier] override (output,per-stream)
+	   Rate control override for specific intervals, formatted as
+	   "int,int,int" list separated with slashes. Two first values are the
+	   beginning and end frame numbers, last one is quantizer to use if
+	   positive, or quality factor if negative.
+
+       -vstats
+	   Dump video coding statistics to vstats_HHMMSS.log. See the vstats
+	   file format section for the format description.
+
+       -vstats_file file
+	   Dump video coding statistics to file. See the vstats file format
+	   section for the format description.
+
+       -vstats_version file
+	   Specify which version of the vstats format to use. Default is 2.
+	   See the vstats file format section for the format description.
+
+       -vtag fourcc/tag (output)
+	   Force video tag/fourcc. This is an alias for "-tag:v".
+
+       -force_key_frames[:stream_specifier] time[,time...] (output,per-stream)
+       -force_key_frames[:stream_specifier] expr:expr (output,per-stream)
+       -force_key_frames[:stream_specifier] source (output,per-stream)
+	   force_key_frames can take arguments of the following form:
+
+	   time[,time...]
+	       If the argument consists of timestamps, ffmpeg will round the
+	       specified times to the nearest output timestamp as per the
+	       encoder time base and force a keyframe at the first frame
+	       having timestamp equal or greater than the computed timestamp.
+	       Note that if the encoder time base is too coarse, then the
+	       keyframes may be forced on frames with timestamps lower than
+	       the specified time.  The default encoder time base is the
+	       inverse of the output framerate but may be set otherwise via
+	       "-enc_time_base".
+
+	       If one of the times is ""chapters"[delta]", it is expanded into
+	       the time of the beginning of all chapters in the file, shifted
+	       by delta, expressed as a time in seconds.  This option can be
+	       useful to ensure that a seek point is present at a chapter mark
+	       or any other designated place in the output file.
+
+	       For example, to insert a key frame at 5 minutes, plus key
+	       frames 0.1 second before the beginning of every chapter:
+
+		       -force_key_frames 0:05:00,chapters-0.1
+
+	   expr:expr
+	       If the argument is prefixed with "expr:", the string expr is
+	       interpreted like an expression and is evaluated for each frame.
+	       A key frame is forced in case the evaluation is non-zero.
+
+	       The expression in expr can contain the following constants:
+
+	       n   the number of current processed frame, starting from 0
+
+	       n_forced
+		   the number of forced frames
+
+	       prev_forced_n
+		   the number of the previous forced frame, it is "NAN" when
+		   no keyframe was forced yet
+
+	       prev_forced_t
+		   the time of the previous forced frame, it is "NAN" when no
+		   keyframe was forced yet
+
+	       t   the time of the current processed frame
+
+	       For example to force a key frame every 5 seconds, you can
+	       specify:
+
+		       -force_key_frames expr:gte(t,n_forced*5)
+
+	       To force a key frame 5 seconds after the time of the last
+	       forced one, starting from second 13:
+
+		       -force_key_frames expr:if(isnan(prev_forced_t),gte(t,13),gte(t,prev_forced_t+5))
+
+	   source
+	       If the argument is "source", ffmpeg will force a key frame if
+	       the current frame being encoded is marked as a key frame in its
+	       source.	In cases where this particular source frame has to be
+	       dropped, enforce the next available frame to become a key frame
+	       instead.
+
+	   Note that forcing too many keyframes is very harmful for the
+	   lookahead algorithms of certain encoders: using fixed-GOP options
+	   or similar would be more efficient.
+
+       -copyinkf[:stream_specifier] (output,per-stream)
+	   When doing stream copy, copy also non-key frames found at the
+	   beginning.
+
+       -init_hw_device type[=name][:device[,key=value...]]
+	   Initialise a new hardware device of type type called name, using
+	   the given device parameters.  If no name is specified it will
+	   receive a default name of the form "type%d".
+
+	   The meaning of device and the following arguments depends on the
+	   device type:
+
+	   cuda
+	       device is the number of the CUDA device.
+
+	       The following options are recognized:
+
+	       primary_ctx
+		   If set to 1, uses the primary device context instead of
+		   creating a new one.
+
+	       Examples:
+
+	       -init_hw_device cuda:1
+		   Choose the second device on the system.
+
+	       -init_hw_device cuda:0,primary_ctx=1
+		   Choose the first device and use the primary device context.
+
+	   dxva2
+	       device is the number of the Direct3D 9 display adapter.
+
+	   d3d11va
+	       device is the number of the Direct3D 11 display adapter.  If
+	       not specified, it will attempt to use the default Direct3D 11
+	       display adapter or the first Direct3D 11 display adapter whose
+	       hardware VendorId is specified by vendor_id.
+
+	       Examples:
+
+	       -init_hw_device d3d11va
+		   Create a d3d11va device on the default Direct3D 11 display
+		   adapter.
+
+	       -init_hw_device d3d11va:1
+		   Create a d3d11va device on the Direct3D 11 display adapter
+		   specified by index 1.
+
+	       -init_hw_device d3d11va:,vendor_id=0x8086
+		   Create a d3d11va device on the first Direct3D 11 display
+		   adapter whose hardware VendorId is 0x8086.
+
+	   vaapi
+	       device is either an X11 display name, a DRM render node or a
+	       DirectX adapter index.  If not specified, it will attempt to
+	       open the default X11 display ($DISPLAY) and then the first DRM
+	       render node (/dev/dri/renderD128), or the default DirectX
+	       adapter on Windows.
+
+	       The following options are recognized:
+
+	       kernel_driver
+		   When device is not specified, use this option to specify
+		   the name of the kernel driver associated with the desired
+		   device. This option is available only when the hardware
+		   acceleration method drm and vaapi are enabled.
+
+	       Examples:
+
+	       -init_hw_device vaapi
+		   Create a vaapi device on the default device.
+
+	       -init_hw_device vaapi:/dev/dri/renderD129
+		   Create a vaapi device on DRM render node
+		   /dev/dri/renderD129.
+
+	       -init_hw_device vaapi:1
+		   Create a vaapi device on DirectX adapter 1.
+
+	       -init_hw_device vaapi:,kernel_driver=i915
+		   Create a vaapi device on a device associated with kernel
+		   driver i915.
+
+	   vdpau
+	       device is an X11 display name.  If not specified, it will
+	       attempt to open the default X11 display ($DISPLAY).
+
+	   qsv device selects a value in MFX_IMPL_*. Allowed values are:
+
+	       auto
+	       sw
+	       hw
+	       auto_any
+	       hw_any
+	       hw2
+	       hw3
+	       hw4
+
+	       If not specified, auto_any is used.  (Note that it may be
+	       easier to achieve the desired result for QSV by creating the
+	       platform-appropriate subdevice (dxva2 or d3d11va or vaapi) and
+	       then deriving a QSV device from that.)
+
+	       The following options are recognized:
+
+	       child_device
+		   Specify a DRM render node on Linux or DirectX adapter on
+		   Windows.
+
+	       child_device_type
+		   Choose platform-appropriate subdevice type. On Windows
+		   d3d11va is used as default subdevice type when
+		   "--enable-libvpl" is specified at configuration time, dxva2
+		   is used as default subdevice type when "--enable-libmfx" is
+		   specified at configuration time. On Linux user can use
+		   vaapi only as subdevice type.
+
+	       Examples:
+
+	       -init_hw_device qsv:hw,child_device=/dev/dri/renderD129
+		   Create a QSV device with MFX_IMPL_HARDWARE on DRM render
+		   node /dev/dri/renderD129.
+
+	       -init_hw_device qsv:hw,child_device=1
+		   Create a QSV device with MFX_IMPL_HARDWARE on DirectX
+		   adapter 1.
+
+	       -init_hw_device qsv:hw,child_device_type=d3d11va
+		   Choose the GPU subdevice with type d3d11va and create QSV
+		   device with MFX_IMPL_HARDWARE.
+
+	       -init_hw_device qsv:hw,child_device_type=dxva2
+		   Choose the GPU subdevice with type dxva2 and create QSV
+		   device with MFX_IMPL_HARDWARE.
+
+	       -init_hw_device qsv:hw,child_device=1,child_device_type=d3d11va
+		   Create a QSV device with MFX_IMPL_HARDWARE on DirectX
+		   adapter 1 with subdevice type d3d11va.
+
+	       -init_hw_device vaapi=va:/dev/dri/renderD129 -init_hw_device
+	       qsv=hw1@va
+		   Create a VAAPI device called va on /dev/dri/renderD129,
+		   then derive a QSV device called hw1 from device va.
+
+	   opencl
+	       device selects the platform and device as
+	       platform_index.device_index.
+
+	       The set of devices can also be filtered using the key-value
+	       pairs to find only devices matching particular platform or
+	       device strings.
+
+	       The strings usable as filters are:
+
+	       platform_profile
+	       platform_version
+	       platform_name
+	       platform_vendor
+	       platform_extensions
+	       device_name
+	       device_vendor
+	       driver_version
+	       device_version
+	       device_profile
+	       device_extensions
+	       device_type
+
+	       The indices and filters must together uniquely select a device.
+
+	       Examples:
+
+	       -init_hw_device opencl:0.1
+		   Choose the second device on the first platform.
+
+	       -init_hw_device opencl:,device_name=Foo9000
+		   Choose the device with a name containing the string
+		   Foo9000.
+
+	       -init_hw_device
+	       opencl:1,device_type=gpu,device_extensions=cl_khr_fp16
+		   Choose the GPU device on the second platform supporting the
+		   cl_khr_fp16 extension.
+
+	   vulkan
+	       If device is an integer, it selects the device by its index in
+	       a system-dependent list of devices.  If device is any other
+	       string, it selects the first device with a name containing that
+	       string as a substring.
+
+	       The following options are recognized:
+
+	       debug
+		   If set to 1, enables the validation layer, if installed.
+
+	       linear_images
+		   If set to 1, images allocated by the hwcontext will be
+		   linear and locally mappable.
+
+	       instance_extensions
+		   A plus separated list of additional instance extensions to
+		   enable.
+
+	       device_extensions
+		   A plus separated list of additional device extensions to
+		   enable.
+
+	       Examples:
+
+	       -init_hw_device vulkan:1
+		   Choose the second device on the system.
+
+	       -init_hw_device vulkan:RADV
+		   Choose the first device with a name containing the string
+		   RADV.
+
+	       -init_hw_device
+	       vulkan:0,instance_extensions=VK_KHR_wayland_surface+VK_KHR_xcb_surface
+		   Choose the first device and enable the Wayland and XCB
+		   instance extensions.
+
+       -init_hw_device type[=name]@source
+	   Initialise a new hardware device of type type called name, deriving
+	   it from the existing device with the name source.
+
+       -init_hw_device list
+	   List all hardware device types supported in this build of ffmpeg.
+
+       -filter_hw_device name
+	   Pass the hardware device called name to all filters in any filter
+	   graph.  This can be used to set the device to upload to with the
+	   "hwupload" filter, or the device to map to with the "hwmap" filter.
+	   Other filters may also make use of this parameter when they require
+	   a hardware device.  Note that this is typically only required when
+	   the input is not already in hardware frames - when it is, filters
+	   will derive the device they require from the context of the frames
+	   they receive as input.
+
+	   This is a global setting, so all filters will receive the same
+	   device.
+
+       -hwaccel[:stream_specifier] hwaccel (input,per-stream)
+	   Use hardware acceleration to decode the matching stream(s). The
+	   allowed values of hwaccel are:
+
+	   none
+	       Do not use any hardware acceleration (the default).
+
+	   auto
+	       Automatically select the hardware acceleration method.
+
+	   vdpau
+	       Use VDPAU (Video Decode and Presentation API for Unix) hardware
+	       acceleration.
+
+	   dxva2
+	       Use DXVA2 (DirectX Video Acceleration) hardware acceleration.
+
+	   d3d11va
+	       Use D3D11VA (DirectX Video Acceleration) hardware acceleration.
+
+	   vaapi
+	       Use VAAPI (Video Acceleration API) hardware acceleration.
+
+	   qsv Use the Intel QuickSync Video acceleration for video
+	       transcoding.
+
+	       Unlike most other values, this option does not enable
+	       accelerated decoding (that is used automatically whenever a qsv
+	       decoder is selected), but accelerated transcoding, without
+	       copying the frames into the system memory.
+
+	       For it to work, both the decoder and the encoder must support
+	       QSV acceleration and no filters must be used.
+
+	   This option has no effect if the selected hwaccel is not available
+	   or not supported by the chosen decoder.
+
+	   Note that most acceleration methods are intended for playback and
+	   will not be faster than software decoding on modern CPUs.
+	   Additionally, ffmpeg will usually need to copy the decoded frames
+	   from the GPU memory into the system memory, resulting in further
+	   performance loss. This option is thus mainly useful for testing.
+
+       -hwaccel_device[:stream_specifier] hwaccel_device (input,per-stream)
+	   Select a device to use for hardware acceleration.
+
+	   This option only makes sense when the -hwaccel option is also
+	   specified.  It can either refer to an existing device created with
+	   -init_hw_device by name, or it can create a new device as if
+	   -init_hw_device type:hwaccel_device were called immediately before.
+
+       -hwaccels
+	   List all hardware acceleration components enabled in this build of
+	   ffmpeg.  Actual runtime availability depends on the hardware and
+	   its suitable driver being installed.
+
+       -fix_sub_duration_heartbeat[:stream_specifier]
+	   Set a specific output video stream as the heartbeat stream
+	   according to which to split and push through currently in-progress
+	   subtitle upon receipt of a random access packet.
+
+	   This lowers the latency of subtitles for which the end packet or
+	   the following subtitle has not yet been received. As a drawback,
+	   this will most likely lead to duplication of subtitle events in
+	   order to cover the full duration, so when dealing with use cases
+	   where latency of when the subtitle event is passed on to output is
+	   not relevant this option should not be utilized.
+
+	   Requires -fix_sub_duration to be set for the relevant input
+	   subtitle stream for this to have any effect, as well as for the
+	   input subtitle stream having to be directly mapped to the same
+	   output in which the heartbeat stream resides.
+
+   Audio Options
+       -aframes number (output)
+	   Set the number of audio frames to output. This is an obsolete alias
+	   for "-frames:a", which you should use instead.
+
+       -ar[:stream_specifier] freq (input/output,per-stream)
+	   Set the audio sampling frequency. For output streams it is set by
+	   default to the frequency of the corresponding input stream. For
+	   input streams this option only makes sense for audio grabbing
+	   devices and raw demuxers and is mapped to the corresponding demuxer
+	   options.
+
+       -aq q (output)
+	   Set the audio quality (codec-specific, VBR). This is an alias for
+	   -q:a.
+
+       -ac[:stream_specifier] channels (input/output,per-stream)
+	   Set the number of audio channels. For output streams it is set by
+	   default to the number of input audio channels. For input streams
+	   this option only makes sense for audio grabbing devices and raw
+	   demuxers and is mapped to the corresponding demuxer options.
+
+       -an (input/output)
+	   As an input option, blocks all audio streams of a file from being
+	   filtered or being automatically selected or mapped for any output.
+	   See "-discard" option to disable streams individually.
+
+	   As an output option, disables audio recording i.e. automatic
+	   selection or mapping of any audio stream. For full manual control
+	   see the "-map" option.
+
+       -acodec codec (input/output)
+	   Set the audio codec. This is an alias for "-codec:a".
+
+       -sample_fmt[:stream_specifier] sample_fmt (output,per-stream)
+	   Set the audio sample format. Use "-sample_fmts" to get a list of
+	   supported sample formats.
+
+       -af filtergraph (output)
+	   Create the filtergraph specified by filtergraph and use it to
+	   filter the stream.
+
+	   This is an alias for "-filter:a", see the -filter option.
+
+   Advanced Audio options
+       -atag fourcc/tag (output)
+	   Force audio tag/fourcc. This is an alias for "-tag:a".
+
+       -guess_layout_max channels (input,per-stream)
+	   If some input channel layout is not known, try to guess only if it
+	   corresponds to at most the specified number of channels. For
+	   example, 2 tells to ffmpeg to recognize 1 channel as mono and 2
+	   channels as stereo but not 6 channels as 5.1. The default is to
+	   always try to guess. Use 0 to disable all guessing.
+
+   Subtitle options
+       -scodec codec (input/output)
+	   Set the subtitle codec. This is an alias for "-codec:s".
+
+       -sn (input/output)
+	   As an input option, blocks all subtitle streams of a file from
+	   being filtered or being automatically selected or mapped for any
+	   output. See "-discard" option to disable streams individually.
+
+	   As an output option, disables subtitle recording i.e. automatic
+	   selection or mapping of any subtitle stream. For full manual
+	   control see the "-map" option.
+
+   Advanced Subtitle options
+       -fix_sub_duration
+	   Fix subtitles durations. For each subtitle, wait for the next
+	   packet in the same stream and adjust the duration of the first to
+	   avoid overlap. This is necessary with some subtitles codecs,
+	   especially DVB subtitles, because the duration in the original
+	   packet is only a rough estimate and the end is actually marked by
+	   an empty subtitle frame. Failing to use this option when necessary
+	   can result in exaggerated durations or muxing failures due to non-
+	   monotonic timestamps.
+
+	   Note that this option will delay the output of all data until the
+	   next subtitle packet is decoded: it may increase memory consumption
+	   and latency a lot.
+
+       -canvas_size size
+	   Set the size of the canvas used to render subtitles.
+
+   Advanced options
+       -map [-]input_file_id[:stream_specifier][?] | [linklabel] (output)
+	   Create one or more streams in the output file. This option has two
+	   forms for specifying the data source(s): the first selects one or
+	   more streams from some input file (specified with "-i"), the second
+	   takes an output from some complex filtergraph (specified with
+	   "-filter_complex").
+
+	   In the first form, an output stream is created for every stream
+	   from the input file with the index input_file_id. If
+	   stream_specifier is given, only those streams that match the
+	   specifier are used (see the Stream specifiers section for the
+	   stream_specifier syntax).
+
+	   A "-" character before the stream identifier creates a "negative"
+	   mapping.  It disables matching streams from already created
+	   mappings.
+
+	   A trailing "?" after the stream index will allow the map to be
+	   optional: if the map matches no streams the map will be ignored
+	   instead of failing. Note the map will still fail if an invalid
+	   input file index is used; such as if the map refers to a non-
+	   existent input.
+
+	   An alternative [linklabel] form will map outputs from complex
+	   filter graphs (see the -filter_complex option) to the output file.
+	   linklabel must correspond to a defined output link label in the
+	   graph.
+
+	   This option may be specified multiple times, each adding more
+	   streams to the output file. Any given input stream may also be
+	   mapped any number of times as a source for different output
+	   streams, e.g. in order to use different encoding options and/or
+	   filters. The streams are created in the output in the same order in
+	   which the "-map" options are given on the commandline.
+
+	   Using this option disables the default mappings for this output
+	   file.
+
+	   Examples:
+
+	   map everything
+	       To map ALL streams from the first input file to output
+
+		       ffmpeg -i INPUT -map 0 output
+
+	   select specific stream
+	       If you have two audio streams in the first input file, these
+	       streams are identified by 0:0 and 0:1. You can use "-map" to
+	       select which streams to place in an output file. For example:
+
+		       ffmpeg -i INPUT -map 0:1 out.wav
+
+	       will map the second input stream in INPUT to the (single)
+	       output stream in out.wav.
+
+	   create multiple streams
+	       To select the stream with index 2 from input file a.mov
+	       (specified by the identifier 0:2), and stream with index 6 from
+	       input b.mov (specified by the identifier 1:6), and copy them to
+	       the output file out.mov:
+
+		       ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
+
+	   create multiple streams 2
+	       To select all video and the third audio stream from an input
+	       file:
+
+		       ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT
+
+	   negative map
+	       To map all the streams except the second audio, use negative
+	       mappings
+
+		       ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
+
+	   optional map
+	       To map the video and audio streams from the first input, and
+	       using the trailing "?", ignore the audio mapping if no audio
+	       streams exist in the first input:
+
+		       ffmpeg -i INPUT -map 0:v -map 0:a? OUTPUT
+
+	   map by language
+	       To pick the English audio stream:
+
+		       ffmpeg -i INPUT -map 0:m:language:eng OUTPUT
+
+       -ignore_unknown
+	   Ignore input streams with unknown type instead of failing if
+	   copying such streams is attempted.
+
+       -copy_unknown
+	   Allow input streams with unknown type to be copied instead of
+	   failing if copying such streams is attempted.
+
+       -map_metadata[:metadata_spec_out] infile[:metadata_spec_in]
+       (output,per-metadata)
+	   Set metadata information of the next output file from infile. Note
+	   that those are file indices (zero-based), not filenames.  Optional
+	   metadata_spec_in/out parameters specify, which metadata to copy.  A
+	   metadata specifier can have the following forms:
+
+	   g   global metadata, i.e. metadata that applies to the whole file
+
+	   s[:stream_spec]
+	       per-stream metadata. stream_spec is a stream specifier as
+	       described in the Stream specifiers chapter. In an input
+	       metadata specifier, the first matching stream is copied from.
+	       In an output metadata specifier, all matching streams are
+	       copied to.
+
+	   c:chapter_index
+	       per-chapter metadata. chapter_index is the zero-based chapter
+	       index.
+
+	   p:program_index
+	       per-program metadata. program_index is the zero-based program
+	       index.
+
+	   If metadata specifier is omitted, it defaults to global.
+
+	   By default, global metadata is copied from the first input file,
+	   per-stream and per-chapter metadata is copied along with
+	   streams/chapters. These default mappings are disabled by creating
+	   any mapping of the relevant type. A negative file index can be used
+	   to create a dummy mapping that just disables automatic copying.
+
+	   For example to copy metadata from the first stream of the input
+	   file to global metadata of the output file:
+
+		   ffmpeg -i in.ogg -map_metadata 0:s:0 out.mp3
+
+	   To do the reverse, i.e. copy global metadata to all audio streams:
+
+		   ffmpeg -i in.mkv -map_metadata:s:a 0:g out.mkv
+
+	   Note that simple 0 would work as well in this example, since global
+	   metadata is assumed by default.
+
+       -map_chapters input_file_index (output)
+	   Copy chapters from input file with index input_file_index to the
+	   next output file. If no chapter mapping is specified, then chapters
+	   are copied from the first input file with at least one chapter. Use
+	   a negative file index to disable any chapter copying.
+
+       -benchmark (global)
+	   Show benchmarking information at the end of an encode.  Shows real,
+	   system and user time used and maximum memory consumption.  Maximum
+	   memory consumption is not supported on all systems, it will usually
+	   display as 0 if not supported.
+
+       -benchmark_all (global)
+	   Show benchmarking information during the encode.  Shows real,
+	   system and user time used in various steps (audio/video
+	   encode/decode).
+
+       -timelimit duration (global)
+	   Exit after ffmpeg has been running for duration seconds in CPU user
+	   time.
+
+       -dump (global)
+	   Dump each input packet to stderr.
+
+       -hex (global)
+	   When dumping packets, also dump the payload.
+
+       -readrate speed (input)
+	   Limit input read speed.
+
+	   Its value is a floating-point positive number which represents the
+	   maximum duration of media, in seconds, that should be ingested in
+	   one second of wallclock time.  Default value is zero and represents
+	   no imposed limitation on speed of ingestion.  Value 1 represents
+	   real-time speed and is equivalent to "-re".
+
+	   Mainly used to simulate a capture device or live input stream (e.g.
+	   when reading from a file).  Should not be used with a low value
+	   when input is an actual capture device or live stream as it may
+	   cause packet loss.
+
+	   It is useful for when flow speed of output packets is important,
+	   such as live streaming.
+
+       -re (input)
+	   Read input at native frame rate. This is equivalent to setting
+	   "-readrate 1".
+
+       -readrate_initial_burst seconds
+	   Set an initial read burst time, in seconds, after which
+	   -re/-readrate will be enforced.
+
+       -vsync parameter (global)
+       -fps_mode[:stream_specifier] parameter (output,per-stream)
+	   Set video sync method / framerate mode. vsync is applied to all
+	   output video streams but can be overridden for a stream by setting
+	   fps_mode. vsync is deprecated and will be removed in the future.
+
+	   For compatibility reasons some of the values for vsync can be
+	   specified as numbers (shown in parentheses in the following table).
+
+	   passthrough (0)
+	       Each frame is passed with its timestamp from the demuxer to the
+	       muxer.
+
+	   cfr (1)
+	       Frames will be duplicated and dropped to achieve exactly the
+	       requested constant frame rate.
+
+	   vfr (2)
+	       Frames are passed through with their timestamp or dropped so as
+	       to prevent 2 frames from having the same timestamp.
+
+	   auto (-1)
+	       Chooses between cfr and vfr depending on muxer capabilities.
+	       This is the default method.
+
+	   Note that the timestamps may be further modified by the muxer,
+	   after this.	For example, in the case that the format option
+	   avoid_negative_ts is enabled.
+
+	   With -map you can select from which stream the timestamps should be
+	   taken. You can leave either video or audio unchanged and sync the
+	   remaining stream(s) to the unchanged one.
+
+       -frame_drop_threshold parameter
+	   Frame drop threshold, which specifies how much behind video frames
+	   can be before they are dropped. In frame rate units, so 1.0 is one
+	   frame.  The default is -1.1. One possible usecase is to avoid
+	   framedrops in case of noisy timestamps or to increase frame drop
+	   precision in case of exact timestamps.
+
+       -apad parameters (output,per-stream)
+	   Pad the output audio stream(s). This is the same as applying "-af
+	   apad".  Argument is a string of filter parameters composed the same
+	   as with the "apad" filter.  "-shortest" must be set for this output
+	   for the option to take effect.
+
+       -copyts
+	   Do not process input timestamps, but keep their values without
+	   trying to sanitize them. In particular, do not remove the initial
+	   start time offset value.
+
+	   Note that, depending on the vsync option or on specific muxer
+	   processing (e.g. in case the format option avoid_negative_ts is
+	   enabled) the output timestamps may mismatch with the input
+	   timestamps even when this option is selected.
+
+       -start_at_zero
+	   When used with copyts, shift input timestamps so they start at
+	   zero.
+
+	   This means that using e.g. "-ss 50" will make output timestamps
+	   start at 50 seconds, regardless of what timestamp the input file
+	   started at.
+
+       -copytb mode
+	   Specify how to set the encoder timebase when stream copying.  mode
+	   is an integer numeric value, and can assume one of the following
+	   values:
+
+	   1   Use the demuxer timebase.
+
+	       The time base is copied to the output encoder from the
+	       corresponding input demuxer. This is sometimes required to
+	       avoid non monotonically increasing timestamps when copying
+	       video streams with variable frame rate.
+
+	   0   Use the decoder timebase.
+
+	       The time base is copied to the output encoder from the
+	       corresponding input decoder.
+
+	   -1  Try to make the choice automatically, in order to generate a
+	       sane output.
+
+	   Default value is -1.
+
+       -enc_time_base[:stream_specifier] timebase (output,per-stream)
+	   Set the encoder timebase. timebase can assume one of the following
+	   values:
+
+	   0   Assign a default value according to the media type.
+
+	       For video - use 1/framerate, for audio - use 1/samplerate.
+
+	   demux
+	       Use the timebase from the demuxer.
+
+	   filter
+	       Use the timebase from the filtergraph.
+
+	   a positive number
+	       Use the provided number as the timebase.
+
+	       This field can be provided as a ratio of two integers (e.g.
+	       1:24, 1:48000) or as a decimal number (e.g. 0.04166, 2.0833e-5)
+
+	   Default value is 0.
+
+       -bitexact (input/output)
+	   Enable bitexact mode for (de)muxer and (de/en)coder
+
+       -shortest (output)
+	   Finish encoding when the shortest output stream ends.
+
+	   Note that this option may require buffering frames, which
+	   introduces extra latency. The maximum amount of this latency may be
+	   controlled with the "-shortest_buf_duration" option.
+
+       -shortest_buf_duration duration (output)
+	   The "-shortest" option may require buffering potentially large
+	   amounts of data when at least one of the streams is "sparse" (i.e.
+	   has large gaps between frames X this is typically the case for
+	   subtitles).
+
+	   This option controls the maximum duration of buffered frames in
+	   seconds.  Larger values may allow the "-shortest" option to produce
+	   more accurate results, but increase memory use and latency.
+
+	   The default value is 10 seconds.
+
+       -dts_delta_threshold threshold
+	   Timestamp discontinuity delta threshold, expressed as a decimal
+	   number of seconds.
+
+	   The timestamp discontinuity correction enabled by this option is
+	   only applied to input formats accepting timestamp discontinuity
+	   (for which the "AVFMT_TS_DISCONT" flag is enabled), e.g. MPEG-TS
+	   and HLS, and is automatically disabled when employing the "-copyts"
+	   option (unless wrapping is detected).
+
+	   If a timestamp discontinuity is detected whose absolute value is
+	   greater than threshold, ffmpeg will remove the discontinuity by
+	   decreasing/increasing the current DTS and PTS by the corresponding
+	   delta value.
+
+	   The default value is 10.
+
+       -dts_error_threshold threshold
+	   Timestamp error delta threshold, expressed as a decimal number of
+	   seconds.
+
+	   The timestamp correction enabled by this option is only applied to
+	   input formats not accepting timestamp discontinuity (for which the
+	   "AVFMT_TS_DISCONT" flag is not enabled).
+
+	   If a timestamp discontinuity is detected whose absolute value is
+	   greater than threshold, ffmpeg will drop the PTS/DTS timestamp
+	   value.
+
+	   The default value is "3600*30" (30 hours), which is arbitrarily
+	   picked and quite conservative.
+
+       -muxdelay seconds (output)
+	   Set the maximum demux-decode delay.
+
+       -muxpreload seconds (output)
+	   Set the initial demux-decode delay.
+
+       -streamid output-stream-index:new-value (output)
+	   Assign a new stream-id value to an output stream. This option
+	   should be specified prior to the output filename to which it
+	   applies.  For the situation where multiple output files exist, a
+	   streamid may be reassigned to a different value.
+
+	   For example, to set the stream 0 PID to 33 and the stream 1 PID to
+	   36 for an output mpegts file:
+
+		   ffmpeg -i inurl -streamid 0:33 -streamid 1:36 out.ts
+
+       -bsf[:stream_specifier] bitstream_filters (input/output,per-stream)
+	   Apply bitstream filters to matching streams. The filters are
+	   applied to each packet as it is received from the demuxer (when
+	   used as an input option) or before it is sent to the muxer (when
+	   used as an output option).
+
+	   bitstream_filters is a comma-separated list of bitstream filter
+	   specifications, each of the form
+
+		   <filter>[=<optname0>=<optval0>:<optname1>=<optval1>:...]
+
+	   Any of the ',=:' characters that are to be a part of an option
+	   value need to be escaped with a backslash.
+
+	   Use the "-bsfs" option to get the list of bitstream filters.
+
+	   E.g.
+
+		   ffmpeg -bsf:v h264_mp4toannexb -i h264.mp4 -c:v copy -an out.h264
+
+	   applies the "h264_mp4toannexb" bitstream filter (which converts
+	   MP4-encapsulated H.264 stream to Annex B) to the input video
+	   stream.
+
+	   On the other hand,
+
+		   ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt
+
+	   applies the "mov2textsub" bitstream filter (which extracts text
+	   from MOV subtitles) to the output subtitle stream. Note, however,
+	   that since both examples use "-c copy", it matters little whether
+	   the filters are applied on input or output - that would change if
+	   transcoding was happening.
+
+       -tag[:stream_specifier] codec_tag (input/output,per-stream)
+	   Force a tag/fourcc for matching streams.
+
+       -timecode hh:mm:ssSEPff
+	   Specify Timecode for writing. SEP is ':' for non drop timecode and
+	   ';' (or '.') for drop.
+
+		   ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg
+
+       -filter_complex filtergraph (global)
+	   Define a complex filtergraph, i.e. one with arbitrary number of
+	   inputs and/or outputs. For simple graphs -- those with one input
+	   and one output of the same type -- see the -filter options.
+	   filtergraph is a description of the filtergraph, as described in
+	   the ``Filtergraph syntax'' section of the ffmpeg-filters manual.
+
+	   Input link labels must refer to either input streams or loopback
+	   decoders. For input streams, use the
+	   "[file_index:stream_specifier]" syntax (i.e. the same as -map
+	   uses). If stream_specifier matches multiple streams, the first one
+	   will be used.
+
+	   For decoders, the link label must be [dec:dec_idx], where dec_idx
+	   is the index of the loopback decoder to be connected to given
+	   input.
+
+	   An unlabeled input will be connected to the first unused input
+	   stream of the matching type.
+
+	   Output link labels are referred to with -map. Unlabeled outputs are
+	   added to the first output file.
+
+	   Note that with this option it is possible to use only lavfi sources
+	   without normal input files.
+
+	   For example, to overlay an image over video
+
+		   ffmpeg -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map
+		   '[out]' out.mkv
+
+	   Here "[0:v]" refers to the first video stream in the first input
+	   file, which is linked to the first (main) input of the overlay
+	   filter. Similarly the first video stream in the second input is
+	   linked to the second (overlay) input of overlay.
+
+	   Assuming there is only one video stream in each input file, we can
+	   omit input labels, so the above is equivalent to
+
+		   ffmpeg -i video.mkv -i image.png -filter_complex 'overlay[out]' -map
+		   '[out]' out.mkv
+
+	   Furthermore we can omit the output label and the single output from
+	   the filter graph will be added to the output file automatically, so
+	   we can simply write
+
+		   ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' out.mkv
+
+	   As a special exception, you can use a bitmap subtitle stream as
+	   input: it will be converted into a video with the same size as the
+	   largest video in the file, or 720x576 if no video is present. Note
+	   that this is an experimental and temporary solution. It will be
+	   removed once libavfilter has proper support for subtitles.
+
+	   For example, to hardcode subtitles on top of a DVB-T recording
+	   stored in MPEG-TS format, delaying the subtitles by 1 second:
+
+		   ffmpeg -i input.ts -filter_complex \
+		     '[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \
+		     -sn -map '#0x2dc' output.mkv
+
+	   (0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the
+	   video, audio and subtitles streams; 0:0, 0:3 and 0:7 would have
+	   worked too)
+
+	   To generate 5 seconds of pure red video using lavfi "color" source:
+
+		   ffmpeg -filter_complex 'color=c=red' -t 5 out.mkv
+
+       -filter_complex_threads nb_threads (global)
+	   Defines how many threads are used to process a filter_complex
+	   graph.  Similar to filter_threads but used for "-filter_complex"
+	   graphs only.  The default is the number of available CPUs.
+
+       -lavfi filtergraph (global)
+	   Define a complex filtergraph, i.e. one with arbitrary number of
+	   inputs and/or outputs. Equivalent to -filter_complex.
+
+       -accurate_seek (input)
+	   This option enables or disables accurate seeking in input files
+	   with the -ss option. It is enabled by default, so seeking is
+	   accurate when transcoding. Use -noaccurate_seek to disable it,
+	   which may be useful e.g. when copying some streams and transcoding
+	   the others.
+
+       -seek_timestamp (input)
+	   This option enables or disables seeking by timestamp in input files
+	   with the -ss option. It is disabled by default. If enabled, the
+	   argument to the -ss option is considered an actual timestamp, and
+	   is not offset by the start time of the file. This matters only for
+	   files which do not start from timestamp 0, such as transport
+	   streams.
+
+       -thread_queue_size size (input/output)
+	   For input, this option sets the maximum number of queued packets
+	   when reading from the file or device. With low latency / high rate
+	   live streams, packets may be discarded if they are not read in a
+	   timely manner; setting this value can force ffmpeg to use a
+	   separate input thread and read packets as soon as they arrive. By
+	   default ffmpeg only does this if multiple inputs are specified.
+
+	   For output, this option specified the maximum number of packets
+	   that may be queued to each muxing thread.
+
+       -sdp_file file (global)
+	   Print sdp information for an output stream to file.	This allows
+	   dumping sdp information when at least one output isn't an rtp
+	   stream. (Requires at least one of the output formats to be rtp).
+
+       -discard (input)
+	   Allows discarding specific streams or frames from streams.  Any
+	   input stream can be fully discarded, using value "all" whereas
+	   selective discarding of frames from a stream occurs at the demuxer
+	   and is not supported by all demuxers.
+
+	   none
+	       Discard no frame.
+
+	   default
+	       Default, which discards no frames.
+
+	   noref
+	       Discard all non-reference frames.
+
+	   bidir
+	       Discard all bidirectional frames.
+
+	   nokey
+	       Discard all frames excepts keyframes.
+
+	   all Discard all frames.
+
+       -abort_on flags (global)
+	   Stop and abort on various conditions. The following flags are
+	   available:
+
+	   empty_output
+	       No packets were passed to the muxer, the output is empty.
+
+	   empty_output_stream
+	       No packets were passed to the muxer in some of the output
+	       streams.
+
+       -max_error_rate (global)
+	   Set fraction of decoding frame failures across all inputs which
+	   when crossed ffmpeg will return exit code 69. Crossing this
+	   threshold does not terminate processing. Range is a floating-point
+	   number between 0 to 1. Default is 2/3.
+
+       -xerror (global)
+	   Stop and exit on error
+
+       -max_muxing_queue_size packets (output,per-stream)
+	   When transcoding audio and/or video streams, ffmpeg will not begin
+	   writing into the output until it has one packet for each such
+	   stream. While waiting for that to happen, packets for other streams
+	   are buffered. This option sets the size of this buffer, in packets,
+	   for the matching output stream.
+
+	   The default value of this option should be high enough for most
+	   uses, so only touch this option if you are sure that you need it.
+
+       -muxing_queue_data_threshold bytes (output,per-stream)
+	   This is a minimum threshold until which the muxing queue size is
+	   not taken into account. Defaults to 50 megabytes per stream, and is
+	   based on the overall size of packets passed to the muxer.
+
+       -auto_conversion_filters (global)
+	   Enable automatically inserting format conversion filters in all
+	   filter graphs, including those defined by -vf, -af, -filter_complex
+	   and -lavfi. If filter format negotiation requires a conversion, the
+	   initialization of the filters will fail.  Conversions can still be
+	   performed by inserting the relevant conversion filter (scale,
+	   aresample) in the graph.  On by default, to explicitly disable it
+	   you need to specify "-noauto_conversion_filters".
+
+       -bits_per_raw_sample[:stream_specifier] value (output,per-stream)
+	   Declare the number of bits per raw sample in the given output
+	   stream to be value. Note that this option sets the information
+	   provided to the encoder/muxer, it does not change the stream to
+	   conform to this value. Setting values that do not match the stream
+	   properties may result in encoding failures or invalid output files.
+
+       -stats_enc_pre[:stream_specifier] path (output,per-stream)
+       -stats_enc_post[:stream_specifier] path (output,per-stream)
+       -stats_mux_pre[:stream_specifier] path (output,per-stream)
+	   Write per-frame encoding information about the matching streams
+	   into the file given by path.
+
+	   -stats_enc_pre writes information about raw video or audio frames
+	   right before they are sent for encoding, while -stats_enc_post
+	   writes information about encoded packets as they are received from
+	   the encoder.  -stats_mux_pre writes information about packets just
+	   as they are about to be sent to the muxer. Every frame or packet
+	   produces one line in the specified file. The format of this line is
+	   controlled by -stats_enc_pre_fmt / -stats_enc_post_fmt /
+	   -stats_mux_pre_fmt.
+
+	   When stats for multiple streams are written into a single file, the
+	   lines corresponding to different streams will be interleaved. The
+	   precise order of this interleaving is not specified and not
+	   guaranteed to remain stable between different invocations of the
+	   program, even with the same options.
+
+       -stats_enc_pre_fmt[:stream_specifier] format_spec (output,per-stream)
+       -stats_enc_post_fmt[:stream_specifier] format_spec (output,per-stream)
+       -stats_mux_pre_fmt[:stream_specifier] format_spec (output,per-stream)
+	   Specify the format for the lines written with -stats_enc_pre /
+	   -stats_enc_post / -stats_mux_pre.
+
+	   format_spec is a string that may contain directives of the form
+	   {fmt}. format_spec is backslash-escaped --- use \{, \}, and \\ to
+	   write a literal {, }, or \, respectively, into the output.
+
+	   The directives given with fmt may be one of the following:
+
+	   fidx
+	       Index of the output file.
+
+	   sidx
+	       Index of the output stream in the file.
+
+	   n   Frame number. Pre-encoding: number of frames sent to the
+	       encoder so far.	Post-encoding: number of packets received from
+	       the encoder so far.  Muxing: number of packets submitted to the
+	       muxer for this stream so far.
+
+	   ni  Input frame number. Index of the input frame (i.e. output by a
+	       decoder) that corresponds to this output frame or packet. -1 if
+	       unavailable.
+
+	   tb  Timebase in which this frame/packet's timestamps are expressed,
+	       as a rational number num/den. Note that encoder and muxer may
+	       use different timebases.
+
+	   tbi Timebase for ptsi, as a rational number num/den. Available when
+	       ptsi is available, 0/1 otherwise.
+
+	   pts Presentation timestamp of the frame or packet, as an integer.
+	       Should be multiplied by the timebase to compute presentation
+	       time.
+
+	   ptsi
+	       Presentation timestamp of the input frame (see ni), as an
+	       integer. Should be multiplied by tbi to compute presentation
+	       time. Printed as (2^63 - 1 = 9223372036854775807) when not
+	       available.
+
+	   t   Presentation time of the frame or packet, as a decimal number.
+	       Equal to pts multiplied by tb.
+
+	   ti  Presentation time of the input frame (see ni), as a decimal
+	       number. Equal to ptsi multiplied by tbi. Printed as inf when
+	       not available.
+
+	   dts (packet)
+	       Decoding timestamp of the packet, as an integer. Should be
+	       multiplied by the timebase to compute presentation time.
+
+	   dt (packet)
+	       Decoding time of the frame or packet, as a decimal number.
+	       Equal to dts multiplied by tb.
+
+	   sn (frame,audio)
+	       Number of audio samples sent to the encoder so far.
+
+	   samp (frame,audio)
+	       Number of audio samples in the frame.
+
+	   size (packet)
+	       Size of the encoded packet in bytes.
+
+	   br (packet)
+	       Current bitrate in bits per second.
+
+	   abr (packet)
+	       Average bitrate for the whole stream so far, in bits per
+	       second, -1 if it cannot be determined at this point.
+
+	   key (packet)
+	       Character 'K' if the packet contains a keyframe, character 'N'
+	       otherwise.
+
+	   Directives tagged with packet may only be used with
+	   -stats_enc_post_fmt and -stats_mux_pre_fmt.
+
+	   Directives tagged with frame may only be used with
+	   -stats_enc_pre_fmt.
+
+	   Directives tagged with audio may only be used with audio streams.
+
+	   The default format strings are:
+
+	   pre-encoding
+	       {fidx} {sidx} {n} {t}
+
+	   post-encoding
+	       {fidx} {sidx} {n} {t}
+
+	   In the future, new items may be added to the end of the default
+	   formatting strings. Users who depend on the format staying exactly
+	   the same, should prescribe it manually.
+
+	   Note that stats for different streams written into the same file
+	   may have different formats.
+
+   Preset files
+       A preset file contains a sequence of option=value pairs, one for each
+       line, specifying a sequence of options which would be awkward to
+       specify on the command line. Lines starting with the hash ('#')
+       character are ignored and are used to provide comments. Check the
+       presets directory in the FFmpeg source tree for examples.
+
+       There are two types of preset files: ffpreset and avpreset files.
+
+       ffpreset files
+
+       ffpreset files are specified with the "vpre", "apre", "spre", and
+       "fpre" options. The "fpre" option takes the filename of the preset
+       instead of a preset name as input and can be used for any kind of
+       codec. For the "vpre", "apre", and "spre" options, the options
+       specified in a preset file are applied to the currently selected codec
+       of the same type as the preset option.
+
+       The argument passed to the "vpre", "apre", and "spre" preset options
+       identifies the preset file to use according to the following rules:
+
+       First ffmpeg searches for a file named arg.ffpreset in the directories
+       $FFMPEG_DATADIR (if set), and $HOME/.ffmpeg, and in the datadir defined
+       at configuration time (usually PREFIX/share/ffmpeg) or in a ffpresets
+       folder along the executable on win32, in that order. For example, if
+       the argument is "libvpx-1080p", it will search for the file
+       libvpx-1080p.ffpreset.
+
+       If no such file is found, then ffmpeg will search for a file named
+       codec_name-arg.ffpreset in the above-mentioned directories, where
+       codec_name is the name of the codec to which the preset file options
+       will be applied. For example, if you select the video codec with
+       "-vcodec libvpx" and use "-vpre 1080p", then it will search for the
+       file libvpx-1080p.ffpreset.
+
+       avpreset files
+
+       avpreset files are specified with the "pre" option. They work similar
+       to ffpreset files, but they only allow encoder- specific options.
+       Therefore, an option=value pair specifying an encoder cannot be used.
+
+       When the "pre" option is specified, ffmpeg will look for files with the
+       suffix .avpreset in the directories $AVCONV_DATADIR (if set), and
+       $HOME/.avconv, and in the datadir defined at configuration time
+       (usually PREFIX/share/ffmpeg), in that order.
+
+       First ffmpeg searches for a file named codec_name-arg.avpreset in the
+       above-mentioned directories, where codec_name is the name of the codec
+       to which the preset file options will be applied. For example, if you
+       select the video codec with "-vcodec libvpx" and use "-pre 1080p", then
+       it will search for the file libvpx-1080p.avpreset.
+
+       If no such file is found, then ffmpeg will search for a file named
+       arg.avpreset in the same directories.
+
+   vstats file format
+       The "-vstats" and "-vstats_file" options enable generation of a file
+       containing statistics about the generated video outputs.
+
+       The "-vstats_version" option controls the format version of the
+       generated file.
+
+       With version 1 the format is:
+
+	       frame= <FRAME> q= <FRAME_QUALITY> PSNR= <PSNR> f_size= <FRAME_SIZE> s_size= <STREAM_SIZE>kB time= <TIMESTAMP> br= <BITRATE>kbits/s avg_br= <AVERAGE_BITRATE>kbits/s
+
+       With version 2 the format is:
+
+	       out= <OUT_FILE_INDEX> st= <OUT_FILE_STREAM_INDEX> frame= <FRAME_NUMBER> q= <FRAME_QUALITY>f PSNR= <PSNR> f_size= <FRAME_SIZE> s_size= <STREAM_SIZE>kB time= <TIMESTAMP> br= <BITRATE>kbits/s avg_br= <AVERAGE_BITRATE>kbits/s
+
+       The value corresponding to each key is described below:
+
+       avg_br
+	   average bitrate expressed in Kbits/s
+
+       br  bitrate expressed in Kbits/s
+
+       frame
+	   number of encoded frame
+
+       out out file index
+
+       PSNR
+	   Peak Signal to Noise Ratio
+
+       q   quality of the frame
+
+       f_size
+	   encoded packet size expressed as number of bytes
+
+       s_size
+	   stream size expressed in KiB
+
+       st  out file stream index
+
+       time
+	   time of the packet
+
+       type
+	   picture type
+
+       See also the -stats_enc options for an alternative way to show encoding
+       statistics.
+
+EXAMPLES
+   Video and Audio grabbing
+       If you specify the input format and device then ffmpeg can grab video
+       and audio directly.
+
+	       ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
+
+       Or with an ALSA audio source (mono input, card id 1) instead of OSS:
+
+	       ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg
+
+       Note that you must activate the right video source and channel before
+       launching ffmpeg with any TV viewer such as
+       <http://linux.bytesex.org/xawtv/> by Gerd Knorr. You also have to set
+       the audio recording levels correctly with a standard mixer.
+
+   X11 grabbing
+       Grab the X11 display with ffmpeg via
+
+	       ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0 /tmp/out.mpg
+
+       0.0 is display.screen number of your X11 server, same as the DISPLAY
+       environment variable.
+
+	       ffmpeg -f x11grab -video_size cif -framerate 25 -i :0.0+10,20 /tmp/out.mpg
+
+       0.0 is display.screen number of your X11 server, same as the DISPLAY
+       environment variable. 10 is the x-offset and 20 the y-offset for the
+       grabbing.
+
+   Video and Audio file format conversion
+       Any supported file format and protocol can serve as input to ffmpeg:
+
+       Examples:
+
+       o   You can use YUV files as input:
+
+		   ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
+
+	   It will use the files:
+
+		   /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
+		   /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
+
+	   The Y files use twice the resolution of the U and V files. They are
+	   raw files, without header. They can be generated by all decent
+	   video decoders. You must specify the size of the image with the -s
+	   option if ffmpeg cannot guess it.
+
+       o   You can input from a raw YUV420P file:
+
+		   ffmpeg -i /tmp/test.yuv /tmp/out.avi
+
+	   test.yuv is a file containing raw YUV planar data. Each frame is
+	   composed of the Y plane followed by the U and V planes at half
+	   vertical and horizontal resolution.
+
+       o   You can output to a raw YUV420P file:
+
+		   ffmpeg -i mydivx.avi hugefile.yuv
+
+       o   You can set several input files and output files:
+
+		   ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
+
+	   Converts the audio file a.wav and the raw YUV video file a.yuv to
+	   MPEG file a.mpg.
+
+       o   You can also do audio and video conversions at the same time:
+
+		   ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
+
+	   Converts a.wav to MPEG audio at 22050 Hz sample rate.
+
+       o   You can encode to several formats at the same time and define a
+	   mapping from input stream to output streams:
+
+		   ffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2
+
+	   Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits.
+	   '-map file:index' specifies which input stream is used for each
+	   output stream, in the order of the definition of output streams.
+
+       o   You can transcode decrypted VOBs:
+
+		   ffmpeg -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi
+
+	   This is a typical DVD ripping example; the input is a VOB file, the
+	   output an AVI file with MPEG-4 video and MP3 audio. Note that in
+	   this command we use B-frames so the MPEG-4 stream is DivX5
+	   compatible, and GOP size is 300 which means one intra frame every
+	   10 seconds for 29.97fps input video. Furthermore, the audio stream
+	   is MP3-encoded so you need to enable LAME support by passing
+	   "--enable-libmp3lame" to configure.	The mapping is particularly
+	   useful for DVD transcoding to get the desired audio language.
+
+	   NOTE: To see the supported input formats, use "ffmpeg -demuxers".
+
+       o   You can extract images from a video, or create a video from many
+	   images:
+
+	   For extracting images from a video:
+
+		   ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
+
+	   This will extract one video frame per second from the video and
+	   will output them in files named foo-001.jpeg, foo-002.jpeg, etc.
+	   Images will be rescaled to fit the new WxH values.
+
+	   If you want to extract just a limited number of frames, you can use
+	   the above command in combination with the "-frames:v" or "-t"
+	   option, or in combination with -ss to start extracting from a
+	   certain point in time.
+
+	   For creating a video from many images:
+
+		   ffmpeg -f image2 -framerate 12 -i foo-%03d.jpeg -s WxH foo.avi
+
+	   The syntax "foo-%03d.jpeg" specifies to use a decimal number
+	   composed of three digits padded with zeroes to express the sequence
+	   number. It is the same syntax supported by the C printf function,
+	   but only formats accepting a normal integer are suitable.
+
+	   When importing an image sequence, -i also supports expanding shell-
+	   like wildcard patterns (globbing) internally, by selecting the
+	   image2-specific "-pattern_type glob" option.
+
+	   For example, for creating a video from filenames matching the glob
+	   pattern "foo-*.jpeg":
+
+		   ffmpeg -f image2 -pattern_type glob -framerate 12 -i 'foo-*.jpeg' -s WxH foo.avi
+
+       o   You can put many streams of the same type in the output:
+
+		   ffmpeg -i test1.avi -i test2.avi -map 1:1 -map 1:0 -map 0:1 -map 0:0 -c copy -y test12.nut
+
+	   The resulting output file test12.nut will contain the first four
+	   streams from the input files in reverse order.
+
+       o   To force CBR video output:
+
+		   ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
+
+       o   The four options lmin, lmax, mblmin and mblmax use 'lambda' units,
+	   but you may use the QP2LAMBDA constant to easily convert from 'q'
+	   units:
+
+		   ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext
+
+SEE ALSO
+       ffmpeg-all(1), ffplay(1), ffprobe(1), ffmpeg-utils(1),
+       ffmpeg-scaler(1), ffmpeg-resampler(1), ffmpeg-codecs(1),
+       ffmpeg-bitstream-filters(1), ffmpeg-formats(1), ffmpeg-devices(1),
+       ffmpeg-protocols(1), ffmpeg-filters(1)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+								     FFMPEG(1)
diff --git a/ffmpeg/manpages/ffprobe.txt b/ffmpeg/manpages/ffprobe.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3d24f96d56c195da2c6dc2dbabed8313cf32cd23
--- /dev/null
+++ b/ffmpeg/manpages/ffprobe.txt
@@ -0,0 +1,1008 @@
+FFPROBE(1)							    FFPROBE(1)
+
+NAME
+       ffprobe - ffprobe media prober
+
+SYNOPSIS
+       ffprobe [options] input_url
+
+DESCRIPTION
+       ffprobe gathers information from multimedia streams and prints it in
+       human- and machine-readable fashion.
+
+       For example it can be used to check the format of the container used by
+       a multimedia stream and the format and type of each media stream
+       contained in it.
+
+       If a url is specified in input, ffprobe will try to open and probe the
+       url content. If the url cannot be opened or recognized as a multimedia
+       file, a positive exit code is returned.
+
+       If no output is specified as output with o ffprobe will write to
+       stdout.
+
+       ffprobe may be employed both as a standalone application or in
+       combination with a textual filter, which may perform more sophisticated
+       processing, e.g. statistical processing or plotting.
+
+       Options are used to list some of the formats supported by ffprobe or
+       for specifying which information to display, and for setting how
+       ffprobe will show it.
+
+       ffprobe output is designed to be easily parsable by a textual filter,
+       and consists of one or more sections of a form defined by the selected
+       writer, which is specified by the output_format option.
+
+       Sections may contain other nested sections, and are identified by a
+       name (which may be shared by other sections), and an unique name. See
+       the output of sections.
+
+       Metadata tags stored in the container or in the streams are recognized
+       and printed in the corresponding "FORMAT", "STREAM",
+       "STREAM_GROUP_STREAM" or "PROGRAM_STREAM" section.
+
+OPTIONS
+       All the numerical options, if not specified otherwise, accept a string
+       representing a number as input, which may be followed by one of the SI
+       unit prefixes, for example: 'K', 'M', or 'G'.
+
+       If 'i' is appended to the SI unit prefix, the complete prefix will be
+       interpreted as a unit prefix for binary multiples, which are based on
+       powers of 1024 instead of powers of 1000. Appending 'B' to the SI unit
+       prefix multiplies the value by 8. This allows using, for example: 'KB',
+       'MiB', 'G' and 'B' as number suffixes.
+
+       Options which do not take arguments are boolean options, and set the
+       corresponding value to true. They can be set to false by prefixing the
+       option name with "no". For example using "-nofoo" will set the boolean
+       option with name "foo" to false.
+
+       Options that take arguments support a special syntax where the argument
+       given on the command line is interpreted as a path to the file from
+       which the actual argument value is loaded. To use this feature, add a
+       forward slash '/' immediately before the option name (after the leading
+       dash). E.g.
+
+	       ffmpeg -i INPUT -/filter:v filter.script OUTPUT
+
+       will load a filtergraph description from the file named filter.script.
+
+   Stream specifiers
+       Some options are applied per-stream, e.g. bitrate or codec. Stream
+       specifiers are used to precisely specify which stream(s) a given option
+       belongs to.
+
+       A stream specifier is a string generally appended to the option name
+       and separated from it by a colon. E.g. "-codec:a:1 ac3" contains the
+       "a:1" stream specifier, which matches the second audio stream.
+       Therefore, it would select the ac3 codec for the second audio stream.
+
+       A stream specifier can match several streams, so that the option is
+       applied to all of them. E.g. the stream specifier in "-b:a 128k"
+       matches all audio streams.
+
+       An empty stream specifier matches all streams. For example, "-codec
+       copy" or "-codec: copy" would copy all the streams without reencoding.
+
+       Possible forms of stream specifiers are:
+
+       stream_index
+	   Matches the stream with this index. E.g. "-threads:1 4" would set
+	   the thread count for the second stream to 4. If stream_index is
+	   used as an additional stream specifier (see below), then it selects
+	   stream number stream_index from the matching streams. Stream
+	   numbering is based on the order of the streams as detected by
+	   libavformat except when a stream group specifier or program ID is
+	   also specified. In this case it is based on the ordering of the
+	   streams in the group or program.
+
+       stream_type[:additional_stream_specifier]
+	   stream_type is one of following: 'v' or 'V' for video, 'a' for
+	   audio, 's' for subtitle, 'd' for data, and 't' for attachments. 'v'
+	   matches all video streams, 'V' only matches video streams which are
+	   not attached pictures, video thumbnails or cover arts. If
+	   additional_stream_specifier is used, then it matches streams which
+	   both have this type and match the additional_stream_specifier.
+	   Otherwise, it matches all streams of the specified type.
+
+       g:group_specifier[:additional_stream_specifier]
+	   Matches streams which are in the group with the specifier
+	   group_specifier.  if additional_stream_specifier is used, then it
+	   matches streams which both are part of the group and match the
+	   additional_stream_specifier.  group_specifier may be one of the
+	   following:
+
+	   group_index
+	       Match the stream with this group index.
+
+	   #group_id or i:group_id
+	       Match the stream with this group id.
+
+       p:program_id[:additional_stream_specifier]
+	   Matches streams which are in the program with the id program_id. If
+	   additional_stream_specifier is used, then it matches streams which
+	   both are part of the program and match the
+	   additional_stream_specifier.
+
+       #stream_id or i:stream_id
+	   Match the stream by stream id (e.g. PID in MPEG-TS container).
+
+       m:key[:value]
+	   Matches streams with the metadata tag key having the specified
+	   value. If value is not given, matches streams that contain the
+	   given tag with any value.
+
+       u   Matches streams with usable configuration, the codec must be
+	   defined and the essential information such as video dimension or
+	   audio sample rate must be present.
+
+	   Note that in ffmpeg, matching by metadata will only work properly
+	   for input files.
+
+   Generic options
+       These options are shared amongst the ff* tools.
+
+       -L  Show license.
+
+       -h, -?, -help, --help [arg]
+	   Show help. An optional parameter may be specified to print help
+	   about a specific item. If no argument is specified, only basic (non
+	   advanced) tool options are shown.
+
+	   Possible values of arg are:
+
+	   long
+	       Print advanced tool options in addition to the basic tool
+	       options.
+
+	   full
+	       Print complete list of options, including shared and private
+	       options for encoders, decoders, demuxers, muxers, filters, etc.
+
+	   decoder=decoder_name
+	       Print detailed information about the decoder named
+	       decoder_name. Use the -decoders option to get a list of all
+	       decoders.
+
+	   encoder=encoder_name
+	       Print detailed information about the encoder named
+	       encoder_name. Use the -encoders option to get a list of all
+	       encoders.
+
+	   demuxer=demuxer_name
+	       Print detailed information about the demuxer named
+	       demuxer_name. Use the -formats option to get a list of all
+	       demuxers and muxers.
+
+	   muxer=muxer_name
+	       Print detailed information about the muxer named muxer_name.
+	       Use the -formats option to get a list of all muxers and
+	       demuxers.
+
+	   filter=filter_name
+	       Print detailed information about the filter named filter_name.
+	       Use the -filters option to get a list of all filters.
+
+	   bsf=bitstream_filter_name
+	       Print detailed information about the bitstream filter named
+	       bitstream_filter_name.  Use the -bsfs option to get a list of
+	       all bitstream filters.
+
+	   protocol=protocol_name
+	       Print detailed information about the protocol named
+	       protocol_name.  Use the -protocols option to get a list of all
+	       protocols.
+
+       -version
+	   Show version.
+
+       -buildconf
+	   Show the build configuration, one option per line.
+
+       -formats
+	   Show available formats (including devices).
+
+       -demuxers
+	   Show available demuxers.
+
+       -muxers
+	   Show available muxers.
+
+       -devices
+	   Show available devices.
+
+       -codecs
+	   Show all codecs known to libavcodec.
+
+	   Note that the term 'codec' is used throughout this documentation as
+	   a shortcut for what is more correctly called a media bitstream
+	   format.
+
+       -decoders
+	   Show available decoders.
+
+       -encoders
+	   Show all available encoders.
+
+       -bsfs
+	   Show available bitstream filters.
+
+       -protocols
+	   Show available protocols.
+
+       -filters
+	   Show available libavfilter filters.
+
+       -pix_fmts
+	   Show available pixel formats.
+
+       -sample_fmts
+	   Show available sample formats.
+
+       -layouts
+	   Show channel names and standard channel layouts.
+
+       -dispositions
+	   Show stream dispositions.
+
+       -colors
+	   Show recognized color names.
+
+       -sources device[,opt1=val1[,opt2=val2]...]
+	   Show autodetected sources of the input device.  Some devices may
+	   provide system-dependent source names that cannot be autodetected.
+	   The returned list cannot be assumed to be always complete.
+
+		   ffmpeg -sources pulse,server=192.168.0.4
+
+       -sinks device[,opt1=val1[,opt2=val2]...]
+	   Show autodetected sinks of the output device.  Some devices may
+	   provide system-dependent sink names that cannot be autodetected.
+	   The returned list cannot be assumed to be always complete.
+
+		   ffmpeg -sinks pulse,server=192.168.0.4
+
+       -loglevel [flags+]loglevel | -v [flags+]loglevel
+	   Set logging level and flags used by the library.
+
+	   The optional flags prefix can consist of the following values:
+
+	   repeat
+	       Indicates that repeated log output should not be compressed to
+	       the first line and the "Last message repeated n times" line
+	       will be omitted.
+
+	   level
+	       Indicates that log output should add a "[level]" prefix to each
+	       message line. This can be used as an alternative to log
+	       coloring, e.g. when dumping the log to file.
+
+	   Flags can also be used alone by adding a '+'/'-' prefix to
+	   set/reset a single flag without affecting other flags or changing
+	   loglevel. When setting both flags and loglevel, a '+' separator is
+	   expected between the last flags value and before loglevel.
+
+	   loglevel is a string or a number containing one of the following
+	   values:
+
+	   quiet, -8
+	       Show nothing at all; be silent.
+
+	   panic, 0
+	       Only show fatal errors which could lead the process to crash,
+	       such as an assertion failure. This is not currently used for
+	       anything.
+
+	   fatal, 8
+	       Only show fatal errors. These are errors after which the
+	       process absolutely cannot continue.
+
+	   error, 16
+	       Show all errors, including ones which can be recovered from.
+
+	   warning, 24
+	       Show all warnings and errors. Any message related to possibly
+	       incorrect or unexpected events will be shown.
+
+	   info, 32
+	       Show informative messages during processing. This is in
+	       addition to warnings and errors. This is the default value.
+
+	   verbose, 40
+	       Same as "info", except more verbose.
+
+	   debug, 48
+	       Show everything, including debugging information.
+
+	   trace, 56
+
+	   For example to enable repeated log output, add the "level" prefix,
+	   and set loglevel to "verbose":
+
+		   ffmpeg -loglevel repeat+level+verbose -i input output
+
+	   Another example that enables repeated log output without affecting
+	   current state of "level" prefix flag or loglevel:
+
+		   ffmpeg [...] -loglevel +repeat
+
+	   By default the program logs to stderr. If coloring is supported by
+	   the terminal, colors are used to mark errors and warnings. Log
+	   coloring can be disabled setting the environment variable
+	   AV_LOG_FORCE_NOCOLOR, or can be forced setting the environment
+	   variable AV_LOG_FORCE_COLOR.
+
+       -report
+	   Dump full command line and log output to a file named
+	   "program-YYYYMMDD-HHMMSS.log" in the current directory.  This file
+	   can be useful for bug reports.  It also implies "-loglevel debug".
+
+	   Setting the environment variable FFREPORT to any value has the same
+	   effect. If the value is a ':'-separated key=value sequence, these
+	   options will affect the report; option values must be escaped if
+	   they contain special characters or the options delimiter ':' (see
+	   the ``Quoting and escaping'' section in the ffmpeg-utils manual).
+
+	   The following options are recognized:
+
+	   file
+	       set the file name to use for the report; %p is expanded to the
+	       name of the program, %t is expanded to a timestamp, "%%" is
+	       expanded to a plain "%"
+
+	   level
+	       set the log verbosity level using a numerical value (see
+	       "-loglevel").
+
+	   For example, to output a report to a file named ffreport.log using
+	   a log level of 32 (alias for log level "info"):
+
+		   FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output
+
+	   Errors in parsing the environment variable are not fatal, and will
+	   not appear in the report.
+
+       -hide_banner
+	   Suppress printing banner.
+
+	   All FFmpeg tools will normally show a copyright notice, build
+	   options and library versions. This option can be used to suppress
+	   printing this information.
+
+       -cpuflags flags (global)
+	   Allows setting and clearing cpu flags. This option is intended for
+	   testing. Do not use it unless you know what you're doing.
+
+		   ffmpeg -cpuflags -sse+mmx ...
+		   ffmpeg -cpuflags mmx ...
+		   ffmpeg -cpuflags 0 ...
+
+	   Possible flags for this option are:
+
+	   x86
+	       mmx
+	       mmxext
+	       sse
+	       sse2
+	       sse2slow
+	       sse3
+	       sse3slow
+	       ssse3
+	       atom
+	       sse4.1
+	       sse4.2
+	       avx
+	       avx2
+	       xop
+	       fma3
+	       fma4
+	       3dnow
+	       3dnowext
+	       bmi1
+	       bmi2
+	       cmov
+	   ARM
+	       armv5te
+	       armv6
+	       armv6t2
+	       vfp
+	       vfpv3
+	       neon
+	       setend
+	   AArch64
+	       armv8
+	       vfp
+	       neon
+	   PowerPC
+	       altivec
+	   Specific Processors
+	       pentium2
+	       pentium3
+	       pentium4
+	       k6
+	       k62
+	       athlon
+	       athlonxp
+	       k8
+       -cpucount count (global)
+	   Override detection of CPU count. This option is intended for
+	   testing. Do not use it unless you know what you're doing.
+
+		   ffmpeg -cpucount 2
+
+       -max_alloc bytes
+	   Set the maximum size limit for allocating a block on the heap by
+	   ffmpeg's family of malloc functions. Exercise extreme caution when
+	   using this option. Don't use if you do not understand the full
+	   consequence of doing so.  Default is INT_MAX.
+
+   AVOptions
+       These options are provided directly by the libavformat, libavdevice and
+       libavcodec libraries. To see the list of available AVOptions, use the
+       -help option. They are separated into two categories:
+
+       generic
+	   These options can be set for any container, codec or device.
+	   Generic options are listed under AVFormatContext options for
+	   containers/devices and under AVCodecContext options for codecs.
+
+       private
+	   These options are specific to the given container, device or codec.
+	   Private options are listed under their corresponding
+	   containers/devices/codecs.
+
+       For example to write an ID3v2.3 header instead of a default ID3v2.4 to
+       an MP3 file, use the id3v2_version private option of the MP3 muxer:
+
+	       ffmpeg -i input.flac -id3v2_version 3 out.mp3
+
+       All codec AVOptions are per-stream, and thus a stream specifier should
+       be attached to them:
+
+	       ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
+
+       In the above example, a multichannel audio stream is mapped twice for
+       output.	The first instance is encoded with codec ac3 and bitrate 640k.
+       The second instance is downmixed to 2 channels and encoded with codec
+       aac. A bitrate of 128k is specified for it using absolute index of the
+       output stream.
+
+       Note: the -nooption syntax cannot be used for boolean AVOptions, use
+       -option 0/-option 1.
+
+       Note: the old undocumented way of specifying per-stream AVOptions by
+       prepending v/a/s to the options name is now obsolete and will be
+       removed soon.
+
+   Main options
+       -f format
+	   Force format to use.
+
+       -unit
+	   Show the unit of the displayed values.
+
+       -prefix
+	   Use SI prefixes for the displayed values.  Unless the
+	   "-byte_binary_prefix" option is used all the prefixes are decimal.
+
+       -byte_binary_prefix
+	   Force the use of binary prefixes for byte values.
+
+       -sexagesimal
+	   Use sexagesimal format HH:MM:SS.MICROSECONDS for time values.
+
+       -pretty
+	   Prettify the format of the displayed values, it corresponds to the
+	   options "-unit -prefix -byte_binary_prefix -sexagesimal".
+
+       -output_format, -of, -print_format writer_name[=writer_options]
+	   Set the output printing format.
+
+	   writer_name specifies the name of the writer, and writer_options
+	   specifies the options to be passed to the writer.
+
+	   For example for printing the output in JSON format, specify:
+
+		   -output_format json
+
+	   For more details on the available output printing formats, see the
+	   Writers section below.
+
+       -sections
+	   Print sections structure and section information, and exit. The
+	   output is not meant to be parsed by a machine.
+
+       -select_streams stream_specifier
+	   Select only the streams specified by stream_specifier. This option
+	   affects only the options related to streams (e.g. "show_streams",
+	   "show_packets", etc.).
+
+	   For example to show only audio streams, you can use the command:
+
+		   ffprobe -show_streams -select_streams a INPUT
+
+	   To show only video packets belonging to the video stream with index
+	   1:
+
+		   ffprobe -show_packets -select_streams v:1 INPUT
+
+       -show_data
+	   Show payload data, as a hexadecimal and ASCII dump. Coupled with
+	   -show_packets, it will dump the packets' data. Coupled with
+	   -show_streams, it will dump the codec extradata.
+
+	   The dump is printed as the "data" field. It may contain newlines.
+
+       -show_data_hash algorithm
+	   Show a hash of payload data, for packets with -show_packets and for
+	   codec extradata with -show_streams.
+
+       -show_error
+	   Show information about the error found when trying to probe the
+	   input.
+
+	   The error information is printed within a section with name
+	   "ERROR".
+
+       -show_format
+	   Show information about the container format of the input multimedia
+	   stream.
+
+	   All the container format information is printed within a section
+	   with name "FORMAT".
+
+       -show_format_entry name
+	   Like -show_format, but only prints the specified entry of the
+	   container format information, rather than all. This option may be
+	   given more than once, then all specified entries will be shown.
+
+	   This option is deprecated, use "show_entries" instead.
+
+       -show_entries section_entries
+	   Set list of entries to show.
+
+	   Entries are specified according to the following syntax.
+	   section_entries contains a list of section entries separated by
+	   ":". Each section entry is composed by a section name (or unique
+	   name), optionally followed by a list of entries local to that
+	   section, separated by ",".
+
+	   If section name is specified but is followed by no "=", all entries
+	   are printed to output, together with all the contained sections.
+	   Otherwise only the entries specified in the local section entries
+	   list are printed. In particular, if "=" is specified but the list
+	   of local entries is empty, then no entries will be shown for that
+	   section.
+
+	   Note that the order of specification of the local section entries
+	   is not honored in the output, and the usual display order will be
+	   retained.
+
+	   The formal syntax is given by:
+
+		   <LOCAL_SECTION_ENTRIES> ::= <SECTION_ENTRY_NAME>[,<LOCAL_SECTION_ENTRIES>]
+		   <SECTION_ENTRY>	   ::= <SECTION_NAME>[=[<LOCAL_SECTION_ENTRIES>]]
+		   <SECTION_ENTRIES>	   ::= <SECTION_ENTRY>[:<SECTION_ENTRIES>]
+
+	   For example, to show only the index and type of each stream, and
+	   the PTS time, duration time, and stream index of the packets, you
+	   can specify the argument:
+
+		   packet=pts_time,duration_time,stream_index : stream=index,codec_type
+
+	   To show all the entries in the section "format", but only the codec
+	   type in the section "stream", specify the argument:
+
+		   format : stream=codec_type
+
+	   To show all the tags in the stream and format sections:
+
+		   stream_tags : format_tags
+
+	   To show only the "title" tag (if available) in the stream sections:
+
+		   stream_tags=title
+
+       -show_packets
+	   Show information about each packet contained in the input
+	   multimedia stream.
+
+	   The information for each single packet is printed within a
+	   dedicated section with name "PACKET".
+
+       -show_frames
+	   Show information about each frame and subtitle contained in the
+	   input multimedia stream.
+
+	   The information for each single frame is printed within a dedicated
+	   section with name "FRAME" or "SUBTITLE".
+
+       -show_log loglevel
+	   Show logging information from the decoder about each frame
+	   according to the value set in loglevel, (see "-loglevel"). This
+	   option requires "-show_frames".
+
+	   The information for each log message is printed within a dedicated
+	   section with name "LOG".
+
+       -show_streams
+	   Show information about each media stream contained in the input
+	   multimedia stream.
+
+	   Each media stream information is printed within a dedicated section
+	   with name "STREAM".
+
+       -show_programs
+	   Show information about programs and their streams contained in the
+	   input multimedia stream.
+
+	   Each media stream information is printed within a dedicated section
+	   with name "PROGRAM_STREAM".
+
+       -show_stream_groups
+	   Show information about stream groups and their streams contained in
+	   the input multimedia stream.
+
+	   Each media stream information is printed within a dedicated section
+	   with name "STREAM_GROUP_STREAM".
+
+       -show_chapters
+	   Show information about chapters stored in the format.
+
+	   Each chapter is printed within a dedicated section with name
+	   "CHAPTER".
+
+       -count_frames
+	   Count the number of frames per stream and report it in the
+	   corresponding stream section.
+
+       -count_packets
+	   Count the number of packets per stream and report it in the
+	   corresponding stream section.
+
+       -read_intervals read_intervals
+	   Read only the specified intervals. read_intervals must be a
+	   sequence of interval specifications separated by ",".  ffprobe will
+	   seek to the interval starting point, and will continue reading from
+	   that.
+
+	   Each interval is specified by two optional parts, separated by "%".
+
+	   The first part specifies the interval start position. It is
+	   interpreted as an absolute position, or as a relative offset from
+	   the current position if it is preceded by the "+" character. If
+	   this first part is not specified, no seeking will be performed when
+	   reading this interval.
+
+	   The second part specifies the interval end position. It is
+	   interpreted as an absolute position, or as a relative offset from
+	   the current position if it is preceded by the "+" character. If the
+	   offset specification starts with "#", it is interpreted as the
+	   number of packets to read (not including the flushing packets) from
+	   the interval start. If no second part is specified, the program
+	   will read until the end of the input.
+
+	   Note that seeking is not accurate, thus the actual interval start
+	   point may be different from the specified position. Also, when an
+	   interval duration is specified, the absolute end time will be
+	   computed by adding the duration to the interval start point found
+	   by seeking the file, rather than to the specified start value.
+
+	   The formal syntax is given by:
+
+		   <INTERVAL>  ::= [<START>|+<START_OFFSET>][%[<END>|+<END_OFFSET>]]
+		   <INTERVALS> ::= <INTERVAL>[,<INTERVALS>]
+
+	   A few examples follow.
+
+	   o   Seek to time 10, read packets until 20 seconds after the found
+	       seek point, then seek to position "01:30" (1 minute and thirty
+	       seconds) and read packets until position "01:45".
+
+		       10%+20,01:30%01:45
+
+	   o   Read only 42 packets after seeking to position "01:23":
+
+		       01:23%+#42
+
+	   o   Read only the first 20 seconds from the start:
+
+		       %+20
+
+	   o   Read from the start until position "02:30":
+
+		       %02:30
+
+       -show_private_data, -private
+	   Show private data, that is data depending on the format of the
+	   particular shown element.  This option is enabled by default, but
+	   you may need to disable it for specific uses, for example when
+	   creating XSD-compliant XML output.
+
+       -show_program_version
+	   Show information related to program version.
+
+	   Version information is printed within a section with name
+	   "PROGRAM_VERSION".
+
+       -show_library_versions
+	   Show information related to library versions.
+
+	   Version information for each library is printed within a section
+	   with name "LIBRARY_VERSION".
+
+       -show_versions
+	   Show information related to program and library versions. This is
+	   the equivalent of setting both -show_program_version and
+	   -show_library_versions options.
+
+       -show_pixel_formats
+	   Show information about all pixel formats supported by FFmpeg.
+
+	   Pixel format information for each format is printed within a
+	   section with name "PIXEL_FORMAT".
+
+       -show_optional_fields value
+	   Some writers viz. JSON and XML, omit the printing of fields with
+	   invalid or non-applicable values, while other writers always print
+	   them. This option enables one to control this behaviour.  Valid
+	   values are "always"/1, "never"/0 and "auto"/"-1".  Default is auto.
+
+       -bitexact
+	   Force bitexact output, useful to produce output which is not
+	   dependent on the specific build.
+
+       -i input_url
+	   Read input_url.
+
+       -o output_url
+	   Write output to output_url. If not specified, the output is sent to
+	   stdout.
+
+WRITERS
+       A writer defines the output format adopted by ffprobe, and will be used
+       for printing all the parts of the output.
+
+       A writer may accept one or more arguments, which specify the options to
+       adopt. The options are specified as a list of key=value pairs,
+       separated by ":".
+
+       All writers support the following options:
+
+       string_validation, sv
+	   Set string validation mode.
+
+	   The following values are accepted.
+
+	   fail
+	       The writer will fail immediately in case an invalid string
+	       (UTF-8) sequence or code point is found in the input. This is
+	       especially useful to validate input metadata.
+
+	   ignore
+	       Any validation error will be ignored. This will result in
+	       possibly broken output, especially with the json or xml writer.
+
+	   replace
+	       The writer will substitute invalid UTF-8 sequences or code
+	       points with the string specified with the
+	       string_validation_replacement.
+
+	   Default value is replace.
+
+       string_validation_replacement, svr
+	   Set replacement string to use in case string_validation is set to
+	   replace.
+
+	   In case the option is not specified, the writer will assume the
+	   empty string, that is it will remove the invalid sequences from the
+	   input strings.
+
+       A description of the currently available writers follows.
+
+   default
+       Default format.
+
+       Print each section in the form:
+
+	       [SECTION]
+	       key1=val1
+	       ...
+	       keyN=valN
+	       [/SECTION]
+
+       Metadata tags are printed as a line in the corresponding FORMAT,
+       STREAM, STREAM_GROUP_STREAM or PROGRAM_STREAM section, and are prefixed
+       by the string "TAG:".
+
+       A description of the accepted options follows.
+
+       nokey, nk
+	   If set to 1 specify not to print the key of each field. Default
+	   value is 0.
+
+       noprint_wrappers, nw
+	   If set to 1 specify not to print the section header and footer.
+	   Default value is 0.
+
+   compact, csv
+       Compact and CSV format.
+
+       The "csv" writer is equivalent to "compact", but supports different
+       defaults.
+
+       Each section is printed on a single line.  If no option is specified,
+       the output has the form:
+
+	       section|key1=val1| ... |keyN=valN
+
+       Metadata tags are printed in the corresponding "format" or "stream"
+       section. A metadata tag key, if printed, is prefixed by the string
+       "tag:".
+
+       The description of the accepted options follows.
+
+       item_sep, s
+	   Specify the character to use for separating fields in the output
+	   line.  It must be a single printable character, it is "|" by
+	   default ("," for the "csv" writer).
+
+       nokey, nk
+	   If set to 1 specify not to print the key of each field. Its default
+	   value is 0 (1 for the "csv" writer).
+
+       escape, e
+	   Set the escape mode to use, default to "c" ("csv" for the "csv"
+	   writer).
+
+	   It can assume one of the following values:
+
+	   c   Perform C-like escaping. Strings containing a newline (\n),
+	       carriage return (\r), a tab (\t), a form feed (\f), the
+	       escaping character (\) or the item separator character SEP are
+	       escaped using C-like fashioned escaping, so that a newline is
+	       converted to the sequence \n, a carriage return to \r, \ to \\
+	       and the separator SEP is converted to \SEP.
+
+	   csv Perform CSV-like escaping, as described in RFC4180.  Strings
+	       containing a newline (\n), a carriage return (\r), a double
+	       quote ("), or SEP are enclosed in double-quotes.
+
+	   none
+	       Perform no escaping.
+
+       print_section, p
+	   Print the section name at the beginning of each line if the value
+	   is 1, disable it with value set to 0. Default value is 1.
+
+   flat
+       Flat format.
+
+       A free-form output where each line contains an explicit key=value, such
+       as "streams.stream.3.tags.foo=bar". The output is shell escaped, so it
+       can be directly embedded in sh scripts as long as the separator
+       character is an alphanumeric character or an underscore (see sep_char
+       option).
+
+       The description of the accepted options follows.
+
+       sep_char, s
+	   Separator character used to separate the chapter, the section name,
+	   IDs and potential tags in the printed field key.
+
+	   Default value is ..
+
+       hierarchical, h
+	   Specify if the section name specification should be hierarchical.
+	   If set to 1, and if there is more than one section in the current
+	   chapter, the section name will be prefixed by the name of the
+	   chapter. A value of 0 will disable this behavior.
+
+	   Default value is 1.
+
+   ini
+       INI format output.
+
+       Print output in an INI based format.
+
+       The following conventions are adopted:
+
+       o   all key and values are UTF-8
+
+       o   . is the subgroup separator
+
+       o   newline, \t, \f, \b and the following characters are escaped
+
+       o   \ is the escape character
+
+       o   # is the comment indicator
+
+       o   = is the key/value separator
+
+       o   : is not used but usually parsed as key/value separator
+
+       This writer accepts options as a list of key=value pairs, separated by
+       :.
+
+       The description of the accepted options follows.
+
+       hierarchical, h
+	   Specify if the section name specification should be hierarchical.
+	   If set to 1, and if there is more than one section in the current
+	   chapter, the section name will be prefixed by the name of the
+	   chapter. A value of 0 will disable this behavior.
+
+	   Default value is 1.
+
+   json
+       JSON based format.
+
+       Each section is printed using JSON notation.
+
+       The description of the accepted options follows.
+
+       compact, c
+	   If set to 1 enable compact output, that is each section will be
+	   printed on a single line. Default value is 0.
+
+       For more information about JSON, see <http://www.json.org/>.
+
+   xml
+       XML based format.
+
+       The XML output is described in the XML schema description file
+       ffprobe.xsd installed in the FFmpeg datadir.
+
+       An updated version of the schema can be retrieved at the url
+       <http://www.ffmpeg.org/schema/ffprobe.xsd>, which redirects to the
+       latest schema committed into the FFmpeg development source code tree.
+
+       Note that the output issued will be compliant to the ffprobe.xsd schema
+       only when no special global output options (unit, prefix,
+       byte_binary_prefix, sexagesimal etc.) are specified.
+
+       The description of the accepted options follows.
+
+       fully_qualified, q
+	   If set to 1 specify if the output should be fully qualified.
+	   Default value is 0.	This is required for generating an XML file
+	   which can be validated through an XSD file.
+
+       xsd_strict, x
+	   If set to 1 perform more checks for ensuring that the output is XSD
+	   compliant. Default value is 0.  This option automatically sets
+	   fully_qualified to 1.
+
+       For more information about the XML format, see
+       <https://www.w3.org/XML/>.
+
+TIMECODE
+       ffprobe supports Timecode extraction:
+
+       o   MPEG1/2 timecode is extracted from the GOP, and is available in the
+	   video stream details (-show_streams, see timecode).
+
+       o   MOV timecode is extracted from tmcd track, so is available in the
+	   tmcd stream metadata (-show_streams, see TAG:timecode).
+
+       o   DV, GXF and AVI timecodes are available in format metadata
+	   (-show_format, see TAG:timecode).
+
+SEE ALSO
+       ffprobe-all(1), ffmpeg(1), ffplay(1), ffmpeg-utils(1),
+       ffmpeg-scaler(1), ffmpeg-resampler(1), ffmpeg-codecs(1),
+       ffmpeg-bitstream-filters(1), ffmpeg-formats(1), ffmpeg-devices(1),
+       ffmpeg-protocols(1), ffmpeg-filters(1)
+
+AUTHORS
+       The FFmpeg developers.
+
+       For details about the authorship, see the Git history of the project
+       (https://git.ffmpeg.org/ffmpeg), e.g. by typing the command git log in
+       the FFmpeg source directory, or browsing the online repository at
+       <https://git.ffmpeg.org/ffmpeg>.
+
+       Maintainers for the specific components are listed in the file
+       MAINTAINERS in the source code tree.
+
+								    FFPROBE(1)
diff --git a/ffmpeg/model/000-PLEASE-README.TXT b/ffmpeg/model/000-PLEASE-README.TXT
new file mode 100644
index 0000000000000000000000000000000000000000..afab15ab39006d5d9095afc18a88d8a99e9cd71e
--- /dev/null
+++ b/ffmpeg/model/000-PLEASE-README.TXT
@@ -0,0 +1,4 @@
+The vmaf filter expects this directory of models to be preset at /usr/local/share/model
+
+If you wish to use this filter, run "sudo cp -r model /usr/local/share/" from the directory
+containing the static binaries. If not, you can ignore this and do nothing.
diff --git a/ffmpeg/model/other_models/model_V8a.model b/ffmpeg/model/other_models/model_V8a.model
new file mode 100644
index 0000000000000000000000000000000000000000..34c4e42ecce5d298f2a1f1e3d0d94a26e896c3b3
--- /dev/null
+++ b/ffmpeg/model/other_models/model_V8a.model
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:047ff7bfd0b51bdd51c35a6623bebe07c7b925a537ca219c8efd2be80370d683
+size 4715
diff --git a/ffmpeg/model/other_models/nflx_v1.json b/ffmpeg/model/other_models/nflx_v1.json
new file mode 100644
index 0000000000000000000000000000000000000000..7cff258c7acf446d530cfefad56bbc96995d12c5
--- /dev/null
+++ b/ffmpeg/model/other_models/nflx_v1.json
@@ -0,0 +1,42 @@
+{
+    "param_dict": {
+        "C": 1.0,
+        "norm_type": "clip_0to1",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "cache_size": 200,
+        "nu": 0.5,
+        "gamma": 0.85
+    },
+    "model_dict": {
+        "norm_type": "linear_rescale",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "feature_names": [
+            "VMAF_feature_adm_score",
+            "VMAF_feature_ansnr_score",
+            "VMAF_feature_motion_score",
+            "VMAF_feature_vif_score"
+        ],
+        "intercepts": [
+            -0.1909090909090909,
+            -1.635828565827225,
+            -0.5027725296167747,
+            -0.022214587359292954,
+            -0.12191917348723096
+        ],
+        "model_type": "LIBSVMNUSVR",
+        "slopes": [
+            0.010909090909090908,
+            2.635828565827225,
+            0.030306790717580585,
+            0.06846153126171134,
+            1.121919173487231
+        ],
+        "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.85\nnr_class 2\ntotal_sv 87\nrho -0.678599\nSV\n-1 1:0.500758 2:0.44434935 3:0.80360073 4:0.25504335 \n-1 1:0.66395488 2:0.49545656 3:0.80360073 4:0.30315084 \n-1 1:0.68710445 2:0.51616008 3:0.80360073 4:0.32840241 \n1 1:0.80552743 2:0.57886981 3:0.80360073 4:0.3952589 \n1 1:0.93943344 2:0.67382416 3:0.80360073 4:0.48875504 \n-0.6005168509118413 1:0.44111817 2:0.13943156 3:0.060660457 4:0.23164915 \n0.3001652364483464 1:0.79372033 2:0.31017378 3:0.060660457 4:0.4749309 \n1 1:0.91710352 2:0.45437437 3:0.060660457 4:0.66549345 \n0.2347757543790557 1:0.99910085 2:0.62307047 3:0.060660457 4:0.94344783 \n0.9879940111050362 1:0.70228825 2:0.41065868 3:0.25800309 4:0.16020672 \n1 1:0.71225044 2:0.41933192 3:0.25800309 4:0.16684779 \n1 1:0.79683949 2:0.43826809 3:0.25800309 4:0.17816881 \n1 1:0.81652281 2:0.45300881 3:0.25800309 4:0.19016999 \n-1 1:0.93569958 2:0.48157676 3:0.25800309 4:0.21208644 \n-0.05952502774634448 1:0.93913288 2:0.49123252 3:0.25800309 4:0.22195992 \n-1 1:0.78457344 2:0.32209063 3:0.29975901 4:0.43388438 \n-0.08537060065670415 1:0.98011205 2:0.57256903 3:0.29975901 4:0.69987699 \n-1 1:0.98354192 2:0.5885804 3:0.29975901 4:0.72038426 \n-1 1:0.43053262 2:0.12481478 3:0.49240306 4:0.11338352 \n-1 1:0.48855711 2:0.150659 3:0.49240306 4:0.14217743 \n-1 1:0.60605382 2:0.18559397 3:0.49240306 4:0.18417781 \n-0.7923822897377828 1:0.68505081 2:0.23614196 3:0.49240306 4:0.24718934 \n-0.08210621586290766 1:0.89013303 2:0.39057937 3:0.49240306 4:0.43942102 \n1 1:0.32769235 2:0.11805063 3:0.13125463 4:0.15797584 \n1 1:0.57102853 2:0.18673101 3:0.13125463 4:0.2692099 \n1 1:0.57282199 2:0.18739048 3:0.13125463 4:0.27170222 \n1 1:0.74350533 2:0.27830189 3:0.13125463 4:0.40502819 \n1 1:0.90049487 2:0.43091367 3:0.13125463 4:0.66579618 \n-1 1:0.6494774 2:0.27837021 3:0.41227705 4:0.22867305 \n-1 1:0.76923458 2:0.34709787 3:0.41227705 4:0.30394459 \n-1 1:0.95803953 2:0.52505896 3:0.41227705 4:0.50173907 \n-1 1:0.96714842 2:0.55388193 3:0.41227705 4:0.53377919 \n1 1:0.48186529 2:0.28840495 3:0.3173053 4:0.35029221 \n1 1:0.63910783 2:0.34199561 3:0.3173053 4:0.40973951 \n1 1:0.67242576 2:0.37411679 3:0.3173053 4:0.44891858 \n1 1:0.81232229 2:0.47549925 3:0.3173053 4:0.5571142 \n-1 1:0.51091654 2:0.36753212 4:0.32122832 \n-1 1:0.67131199 2:0.40988734 4:0.37624653 \n-1 1:0.67853479 2:0.41802337 4:0.38490923 \n-1 1:0.77668766 2:0.4530568 4:0.42714338 \n-1 1:0.80010279 2:0.47295605 4:0.44945901 \n0.2238122443981977 1:1 2:0.78323367 3:0.95719598 4:1 \n-1 1:0.36338045 2:0.20017167 3:0.35216405 4:0.19030002 \n-1 1:0.56016075 2:0.2511454 3:0.35216405 4:0.25418659 \n-1 1:0.72561366 2:0.32432484 3:0.35216405 4:0.34947968 \n1 1:0.7525563 2:0.34866202 3:0.35216405 4:0.3991584 \n1 1:0.88089009 2:0.45568174 3:0.35216405 4:0.51691346 \n-1 1:0.67458252 2:0.62423542 3:0.024932462 4:0.49597011 \n-1 1:0.67941593 2:0.6324076 3:0.024932462 4:0.50994261 \n-1 1:0.79839909 2:0.68132931 3:0.024932462 4:0.52861368 \n0.765497786395351 1:0.96138923 2:0.76908851 3:0.024932462 4:0.57268419 \n1 1:0.96906849 2:0.7906865 3:0.024932462 4:0.59393192 \n-1 1:0.61695399 2:0.18704248 3:0.73888524 4:0.1814112 \n-1 1:0.7608844 2:0.25428655 3:0.73888524 4:0.24370254 \n-1 1:0.82057107 2:0.30563046 3:0.73888524 4:0.30618093 \n-1 1:0.89455431 2:0.39394543 3:0.73888524 4:0.41860883 \n-1 1:0.16873718 2:0.15491045 3:0.95719598 4:0.079392181 \n-1 1:0.45188506 2:0.22731935 3:0.95719598 4:0.16130023 \n-0.8676044738986739 1:0.76536179 2:0.36671253 3:0.95719598 4:0.34343984 \n0.6504146395675607 1:2.220446e-16 2:0.23907071 3:0.65112312 4:0.038179135 \n1 1:0.42756068 2:0.33322794 3:0.65112312 4:0.144644 \n1 1:0.54211376 2:0.37139949 3:0.65112312 4:0.1921988 \n1 1:0.59120008 2:0.38742794 3:0.65112312 4:0.20324125 \n1 1:0.61558961 2:0.40700327 3:0.65112312 4:0.23911229 \n1 1:0.66410067 2:0.42453917 3:0.65112312 4:0.25030438 \n1 1:0.77796278 2:0.50015434 3:0.65112312 4:0.35266323 \n1 1:0.850087 2:0.56409596 3:0.65112312 4:0.44272339 \n0.3373403277064526 1:0.89007769 2:0.6105181 3:0.65112312 4:0.51063948 \n1 1:0.2919114 2:0.32670389 3:0.70765261 4:0.16789622 \n1 1:0.56327043 2:0.41097052 3:0.70765261 4:0.28869814 \n-0.9667756382666468 1:0.69223575 2:0.44677163 3:0.70765261 4:0.30435865 \n1 1:0.7570134 2:0.52053937 3:0.70765261 4:0.45274665 \n-1 1:0.93882855 2:0.64245784 3:0.70765261 4:0.54772182 \n-0.04571890291909872 1:0.56052264 2:0.31230263 3:0.27988388 4:0.16193225 \n-1 1:0.70082836 2:0.36112001 3:0.27988388 4:0.2051139 \n1 1:0.73029842 2:0.38872215 3:0.27988388 4:0.2447673 \n1 1:0.86760546 2:0.48182811 3:0.27988388 4:0.33403096 \n1 1:0.87147234 2:0.48882625 3:0.27988388 4:0.34344882 \n1 1:0.95086917 2:0.55599973 3:0.27988388 4:0.39368584 \n1 1:0.67102703 2:0.16297436 3:1 4:0.1833146 \n1 1:0.72313816 2:0.19544136 3:1 4:0.22168406 \n1 1:0.78939255 2:0.22653651 3:1 4:0.24606121 \n1 1:0.83915519 2:0.27026774 3:1 4:0.29560442 \n-1 1:0.47596853 2:0.4846003 3:0.60048989 4:0.30839395 \n-1 1:0.6683492 2:0.56626182 3:0.60048989 4:0.40875179 \n-1 1:0.76380856 2:0.60596099 3:0.60048989 4:0.45269953 \n-1 1:0.8078454 2:0.66094735 3:0.60048989 4:0.52147761 \n"
+    }
+}
\ No newline at end of file
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new file mode 100644
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diff --git a/ffmpeg/model/other_models/nflxtrain_libsvmnusvr_currentbest.pkl b/ffmpeg/model/other_models/nflxtrain_libsvmnusvr_currentbest.pkl
new file mode 100644
index 0000000000000000000000000000000000000000..c41a5fe41ca92a30d9b08a7a9e6f1dee51614f84
--- /dev/null
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diff --git a/ffmpeg/model/other_models/nflxtrain_libsvmnusvr_currentbest.pkl.model b/ffmpeg/model/other_models/nflxtrain_libsvmnusvr_currentbest.pkl.model
new file mode 100644
index 0000000000000000000000000000000000000000..ca45fc7ac4a1b8f5e2d80c02c26372fb42b5142e
--- /dev/null
+++ b/ffmpeg/model/other_models/nflxtrain_libsvmnusvr_currentbest.pkl.model
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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diff --git a/ffmpeg/model/other_models/nflxtrain_norm_type_none.json b/ffmpeg/model/other_models/nflxtrain_norm_type_none.json
new file mode 100644
index 0000000000000000000000000000000000000000..ecd332946ae22e150eab9347c574ad7d6e0c2fb8
--- /dev/null
+++ b/ffmpeg/model/other_models/nflxtrain_norm_type_none.json
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+{
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+        "feature_dict": {
+            "VMAF_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/other_models/nflxtrain_norm_type_none.pkl b/ffmpeg/model/other_models/nflxtrain_norm_type_none.pkl
new file mode 100644
index 0000000000000000000000000000000000000000..66a8866e2f6125dc8b0cf215a08726bddd888608
--- /dev/null
+++ b/ffmpeg/model/other_models/nflxtrain_norm_type_none.pkl
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+        "norm_type": "linear_rescale",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "feature_names": [
+            "VMAF_feature_adm2_score",
+            "VMAF_feature_motion2_score",
+            "VMAF_feature_vif_scale0_score",
+            "VMAF_feature_vif_scale1_score",
+            "VMAF_feature_vif_scale2_score",
+            "VMAF_feature_vif_scale3_score"
+        ],
+        "intercepts": [
+            -0.2545454545454545,
+            -1.445823604286296,
+            -0.0021166363925847658,
+            -0.08203930409252254,
+            -0.28580569810409906,
+            -0.4801667335681057,
+            -0.7764750530230472
+        ],
+        "model_type": "LIBSVMNUSVR",
+        "slopes": [
+            0.011818181818181818,
+            2.445823604286296,
+            0.05347617487103272,
+            1.0820392911303012,
+            1.2858060650284484,
+            1.480167484761588,
+            1.7764758964900356
+        ],
+        "feature_dict": {
+            "VMAF_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/other_models/vmaf_v0.6.0.pkl b/ffmpeg/model/other_models/vmaf_v0.6.0.pkl
new file mode 100644
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--- /dev/null
+++ b/ffmpeg/model/other_models/vmaf_v0.6.0.pkl
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4e6d3a4b9088dbb39988f32bb6db6cf72b2b28d98653a7053f59e507aad26723
+size 1016
diff --git a/ffmpeg/model/other_models/vmaf_v0.6.0.pkl.model b/ffmpeg/model/other_models/vmaf_v0.6.0.pkl.model
new file mode 100644
index 0000000000000000000000000000000000000000..fdf3ddb77473c414e1f8445cdc874e1370b1004d
--- /dev/null
+++ b/ffmpeg/model/other_models/vmaf_v0.6.0.pkl.model
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5c31d5586139fb3a6fadb93be32a0d8fad3959f95d1f6792d8fb044c3a2f7f4c
+size 22261
diff --git a/ffmpeg/model/other_models/vmaf_v0.6.1mfz.json b/ffmpeg/model/other_models/vmaf_v0.6.1mfz.json
new file mode 100644
index 0000000000000000000000000000000000000000..404fade5120a491348151ae008f65460904fceb6
--- /dev/null
+++ b/ffmpeg/model/other_models/vmaf_v0.6.1mfz.json
@@ -0,0 +1,79 @@
+{
+    "param_dict": {
+        "C": 4.0,
+        "score_transform": {
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+            "out_gte_in": "true",
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+            100.0
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+        "nu": 0.9,
+        "gamma": 0.04
+    },
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6:0.88419439 \n-4 1:0.67287449 2:0.047285912 3:0.44652268 4:0.77691812 5:0.81043483 6:0.8177009 \n-4 1:0.8023177 2:0.047285912 3:0.51559706 4:0.90512389 5:0.93743101 6:0.9492968 \n-4 1:0.76751376 2:0.047285912 3:0.49225957 4:0.86357299 5:0.89948127 6:0.91221155 \n-4 1:0.72124785 2:0.047285912 3:0.46606653 4:0.81323145 5:0.84847474 6:0.85892657 \n",
+        "score_transform": {
+            "p2": -0.00705305,
+            "out_gte_in": "true",
+            "p0": 1.70674692,
+            "p1": 1.72643844
+        },
+        "feature_opts_dicts": [
+            {},
+            {
+                "motion_force_zero": true
+            },
+            {},
+            {},
+            {},
+            {}
+        ],
+        "norm_type": "linear_rescale",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "feature_names": [
+            "VMAF_integer_feature_adm2_score",
+            "VMAF_integer_feature_motion2_score",
+            "VMAF_integer_feature_vif_scale0_score",
+            "VMAF_integer_feature_vif_scale1_score",
+            "VMAF_integer_feature_vif_scale2_score",
+            "VMAF_integer_feature_vif_scale3_score"
+        ],
+        "intercepts": [
+            -0.3092981927591963,
+            -1.7993968597186747,
+            -0.003017198086831897,
+            -0.1728125095425364,
+            -0.5294309090081222,
+            -0.7577185792093722,
+            -1.083428597549764
+        ],
+        "model_type": "LIBSVMNUSVR",
+        "slopes": [
+            0.012020766332648465,
+            2.8098077502505414,
+            0.06264407466686016,
+            1.222763456258933,
+            1.5360318811084146,
+            1.7620864995501058,
+            2.08656468286432
+        ],
+        "feature_dict": {
+            "VMAF_integer_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_4k_rb_v0.6.2/vmaf_4k_rb_v0.6.2.json b/ffmpeg/model/vmaf_4k_rb_v0.6.2/vmaf_4k_rb_v0.6.2.json
new file mode 100644
index 0000000000000000000000000000000000000000..8357f70cc3a4f39dda619d1a36bea3109844ea90
--- /dev/null
+++ b/ffmpeg/model/vmaf_4k_rb_v0.6.2/vmaf_4k_rb_v0.6.2.json
@@ -0,0 +1,1162 @@
+{
+    "0": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
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+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
+                -0.09603743694887917,
+                -0.21890356649141152,
+                -0.35835059999617175,
+                -0.5373563330683786
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "1": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
+                -0.09603743694887917,
+                -0.21890356649141152,
+                -0.35835059999617175,
+                -0.5373563330683786
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "2": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
+                -0.09603743694887917,
+                -0.21890356649141152,
+                -0.35835059999617175,
+                -0.5373563330683786
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
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+    },
+    "3": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
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+    },
+    "4": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "5": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+                -0.35835059999617175,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "6": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "7": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.09603743694887917,
+                -0.21890356649141152,
+                -0.35835059999617175,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "8": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.21890356649141152,
+                -0.35835059999617175,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
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+        }
+    },
+    "9": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "10": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
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+                -0.21890356649141152,
+                -0.35835059999617175,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "11": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.21890356649141152,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "12": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "13": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.21890356649141152,
+                -0.35835059999617175,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "14": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
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+                -0.35835059999617175,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
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+    },
+    "15": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+            "slopes": [
+                0.012388059998472608,
+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "16": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
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+                -0.21890356649141152,
+                -0.35835059999617175,
+                -0.5373563330683786
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "17": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "18": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.8536192302086182,
+                -0.01336836451078975,
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+                -0.21890356649141152,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.853012066458466,
+                0.05141551931924402,
+                1.0960374437054892,
+                1.2189036205165853,
+                1.3583508615652835,
+                1.5373567703674345
+            ]
+        }
+    },
+    "19": {
+        "param_dict": {
+            "C": 4.0,
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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1:0.30717303 2:0.067429096 3:0.36080477 4:0.55822348 5:0.57073663 6:0.59274921 \n4 1:0.93399065 2:0.41032924 3:0.59783417 4:0.84190929 5:0.89750138 6:0.92595957 \n-4 1:0.90595546 2:0.41032924 3:0.52675557 4:0.75232557 5:0.81678388 6:0.85451254 \n4 1:0.86884349 2:0.41032924 3:0.54882568 4:0.79721591 5:0.86027193 6:0.89474014 \n4 1:0.83688316 2:0.41032924 3:0.48353911 4:0.70508019 5:0.770587 6:0.80951258 \n-4 1:0.79909048 2:0.41032924 3:0.42019162 4:0.60634089 5:0.66016059 6:0.69152126 \n4 1:0.81190475 2:0.41032924 3:0.49259836 4:0.7117051 5:0.78203532 6:0.82516406 \n4 1:0.74851584 2:0.41032924 3:0.45030562 4:0.6405497 5:0.71098466 6:0.75519602 \n-0.1291220645620671 1:0.70811815 2:0.41032924 3:0.38732716 4:0.54017845 5:0.59142454 6:0.62173185 \n-4 1:0.65812028 2:0.41032924 3:0.32785534 4:0.44278414 5:0.46803981 6:0.47218162 \n4 1:0.61340029 2:0.41032924 3:0.39943043 4:0.54621466 5:0.59971792 6:0.64499079 \n4 1:0.56718004 2:0.41032924 3:0.34225148 4:0.45255833 5:0.47917361 6:0.49550478 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3:0.86407181 4:0.96026885 5:0.98853248 6:0.99389802 \n-4 1:0.84996215 3:0.86241965 4:0.95421974 5:0.98239426 6:0.99048125 \n-4 1:0.82797239 3:0.85970304 4:0.94347269 5:0.97198968 6:0.98376521 \n-4 1:0.78359349 3:0.85232352 4:0.9205106 5:0.9639259 6:0.98760506 \n-4 1:0.7740968 3:0.85087015 4:0.91651049 5:0.95906687 6:0.98343256 \n-4 1:0.76412341 3:0.84902131 4:0.91055943 5:0.94944204 6:0.97481363 \n-4 1:0.61337431 3:0.83940428 4:0.87369959 5:0.90465003 6:0.96092101 \n-4 1:0.59932186 3:0.83841839 4:0.8712363 5:0.90033732 6:0.95480352 \n-4 1:0.58537358 3:0.83696642 4:0.86758813 5:0.893872 6:0.94383497 \n-3.429005082149631 1:0.42062928 3:0.82941095 4:0.83902061 5:0.84510353 6:0.87138257 \n-4 1:0.4002542 3:0.82840514 4:0.8368136 5:0.84093631 6:0.8674834 \n4 1:0.3094628 3:0.82716541 4:0.83024299 5:0.82796719 6:0.86356706 \n4 1:0.29001316 3:0.82647757 4:0.82867904 5:0.8248098 6:0.86408434 \n4 1:0.27710266 3:0.8257051 4:0.82728426 5:0.82235905 6:0.85969923 \n-4 1:0.90663913 2:0.14610739 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4:0.57601896 5:0.65321265 6:0.69799032 \n-4 1:0.54225634 2:0.14610739 3:0.27770782 4:0.51923537 5:0.57477828 6:0.59501544 \n4 1:0.47989563 2:0.14610739 3:0.30820332 4:0.58503378 5:0.66456631 6:0.7174928 \n4 1:0.4414077 2:0.14610739 3:0.28822665 4:0.53887566 5:0.59925188 6:0.62987117 \n-4 1:0.39949501 2:0.14610739 3:0.26598279 4:0.48912153 5:0.52873127 6:0.53229307 \n4 1:0.39206975 2:0.14610739 3:0.29566289 4:0.55497136 5:0.62126765 6:0.66418112 \n4 1:0.36544059 2:0.14610739 3:0.2785156 4:0.5155536 5:0.56455807 6:0.58211923 \n",
+        "norm_type": "linear_rescale",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "feature_names": [
+            "VMAF_integer_feature_adm2_score",
+            "VMAF_integer_feature_motion2_score",
+            "VMAF_integer_feature_vif_scale0_score",
+            "VMAF_integer_feature_vif_scale1_score",
+            "VMAF_integer_feature_vif_scale2_score",
+            "VMAF_integer_feature_vif_scale3_score"
+        ],
+        "intercepts": [
+            -0.31191973282964003,
+            -0.8536192302086182,
+            -0.01336836451078975,
+            -0.09603743694887917,
+            -0.21890356649141152,
+            -0.35835059999617175,
+            -0.5373563330683786
+        ],
+        "model_type": "LIBSVMNUSVR",
+        "slopes": [
+            0.012388059998472608,
+            1.853012066458466,
+            0.05141551931924402,
+            1.0960374437054892,
+            1.2189036205165853,
+            1.3583508615652835,
+            1.5373567703674345
+        ],
+        "feature_dict": {
+            "VMAF_integer_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_b_v0.6.3.json b/ffmpeg/model/vmaf_b_v0.6.3.json
new file mode 100644
index 0000000000000000000000000000000000000000..9bb52cc74a177118ca72cc32e45205e304fea9a7
--- /dev/null
+++ b/ffmpeg/model/vmaf_b_v0.6.3.json
@@ -0,0 +1,1472 @@
+{
+    "0": {
+        "param_dict": {
+            "C": 4.0,
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_integer_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 210\nrho -1.38271\nSV\n-4 1:0.69605554 2:0.34681232 3:0.093755557 4:0.60913934 5:0.69117362 6:0.73495824 \n4 1:0.89192404 2:0.49612229 3:0.59146724 4:0.78105663 5:0.84916292 6:0.8882561 \n4 1:0.91737037 2:0.49612229 3:0.66823667 4:0.86050887 5:0.90873162 6:0.93335071 \n4 1:0.2214182 2:0.49612229 3:0.10534315 4:-1.110223e-16 6:2.220446e-16 \n4 1:0.3594872 2:0.49612229 3:0.14024497 4:0.074708413 5:0.10231651 6:0.1259153 \n4 1:0.67482533 2:0.49612229 3:0.35268026 4:0.4805681 5:0.59603341 6:0.67408692 \n4 1:0.61342581 2:0.49612229 3:0.27561601 4:0.33977371 5:0.4325213 6:0.50244952 \n4 1:0.5343717 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.79391726 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n4 1:0.73867648 2:0.49612229 3:0.35967401 4:0.47825205 5:0.57045236 6:0.63752441 \n4 1:0.67022121 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 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+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+            },
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+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_integer_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
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+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                "p0": 1.70674692,
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+                "p1": 1.72643844
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+            "feature_dict": {
+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+            "gamma": 0.04
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+        "model_dict": {
+            "score_transform": {
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+                "p0": 1.70674692,
+                "p1": 1.72643844
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+            "feature_dict": {
+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+            "feature_dict": {
+                "VMAF_integer_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 212\nrho -0.953329\nSV\n4 1:0.71492133 2:0.42532178 3:0.31296983 4:0.60525302 5:0.69243388 6:0.7432587 \n-4 1:0.77257175 2:0.08765484 3:0.5597726 4:0.80653689 5:0.88996341 6:0.92691132 \n4 1:0.56142653 2:0.49739676 3:0.24752355 4:0.28326524 5:0.33261781 6:0.37104424 \n4 1:0.61928338 2:0.22767235 3:0.15963705 4:0.51010642 5:0.59283393 6:0.63883591 \n4 1:0.79670443 2:0.54342577 3:0.26295318 4:0.6905031 5:0.79291823 6:0.84469464 \n-4 1:0.71258735 2:0.22767235 3:0.1864032 4:0.58471122 5:0.67581508 6:0.72558613 \n-4 1:0.57776221 2:0.08765484 3:0.42071301 4:0.56376512 5:0.66454599 6:0.741236 \n4 1:0.66777856 2:0.42532178 3:0.30879992 4:0.60375124 5:0.70097073 6:0.75507206 \n-4 1:0.73815918 2:0.25207203 3:0.29691153 4:0.66166141 5:0.73408074 6:0.77757209 \n4 1:0.98791521 2:0.04579546 3:0.90293444 4:0.99181622 5:0.99642641 6:0.9978864 \n-4 1:0.74999802 2:0.08765484 3:0.52069978 4:0.74484555 5:0.83431246 6:0.87935204 \n-4 1:0.87823623 2:0.20629643 3:0.36755712 4:0.8681203 5:0.93297792 6:0.95700049 \n-4 1:0.88260358 2:0.083369236 3:0.57279245 4:0.85249389 5:0.91751611 6:0.94621989 \n4 1:0.78180974 2:0.04579546 3:0.54174294 4:0.92424698 5:0.96600395 6:0.97868211 \n4 1:0.91728681 2:0.20820673 3:0.45891267 4:0.87823329 5:0.93535353 6:0.95883927 \n4 1:0.54792627 2:0.055921852 3:0.26207179 4:0.59416461 5:0.75957205 6:0.82870539 \n4 1:0.91839373 2:0.04579546 3:0.69472114 4:0.97790884 5:0.9891237 6:0.993277 \n4 1:0.37333711 2:0.23066177 3:0.29022709 4:0.26882214 5:0.30809596 6:0.35304275 \n4 1:0.89291952 2:0.16787772 3:0.69408521 4:0.91495146 5:0.94890261 6:0.96269344 \n4 1:0.28569186 2:0.20629643 3:0.076468978 4:0.29833807 5:0.37989948 6:0.4576277 \n-4 1:0.56800546 2:0.16787772 3:0.5149767 4:0.63026581 5:0.67890679 6:0.69964851 \n-4 1:0.66382463 2:0.93973481 3:0.28594627 4:0.63969879 5:0.73360583 6:0.78380069 \n-4 1:0.68687464 2:0.93973481 3:0.2669659 4:0.56720118 5:0.63868728 6:0.67673331 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+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
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+                    "motion2"
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_integer_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                    "vif_scale2",
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
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+    "12": {
+        "param_dict": {
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+            "score_transform": {
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+            "norm_type": "clip_0to1",
+            "score_clip": [
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+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_integer_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+    "13": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_integer_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
+            ],
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+                    "vif_scale2",
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+    "15": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
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+            "feature_dict": {
+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+    "16": {
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+                "p0": 1.70674692,
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+            },
+            "feature_dict": {
+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+                "VMAF_integer_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+            },
+            "feature_dict": {
+                "VMAF_integer_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_integer_feature_adm2_score",
+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 210\nrho -1.68654\nSV\n-4 1:0.66382463 2:0.93973481 3:0.28594627 4:0.63969879 5:0.73360583 6:0.78380069 \n4 1:0.25896526 2:0.04579546 3:0.31879 4:0.45852885 5:0.59717781 6:0.71487885 \n-4 1:0.68687464 2:0.93973481 3:0.2669659 4:0.56720118 5:0.63868728 6:0.67673331 \n4 1:0.78020364 2:0.23066177 3:0.50145055 4:0.66525882 5:0.74327951 6:0.79017822 \n-4 1:0.41563731 2:0.48885268 3:0.2554221 4:0.36916892 5:0.43100226 6:0.50888404 \n-4 1:0.73251944 2:0.15600331 3:0.11085278 4:0.68794624 5:0.80350923 6:0.85660483 \n4 1:0.90795371 2:0.58937038 3:0.58823535 4:0.80035053 5:0.86988422 6:0.90533033 \n-4 1:0.79681394 2:0.083369236 3:0.48094343 4:0.76665994 5:0.86191893 6:0.90760934 \n4 1:1 3:0.83319067 4:0.98956086 5:0.99577089 6:0.99784595 \n4 1:0.34770698 2:0.58937038 3:0.24672569 4:0.24188506 5:0.29544562 6:0.33843061 \n4 1:0.61928338 2:0.22767235 3:0.15963705 4:0.51010642 5:0.59283393 6:0.63883591 \n-4 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+                    "vif_scale2",
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+                "VMAF_integer_feature_motion2_score",
+                "VMAF_integer_feature_vif_scale0_score",
+                "VMAF_integer_feature_vif_scale1_score",
+                "VMAF_integer_feature_vif_scale2_score",
+                "VMAF_integer_feature_vif_scale3_score"
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+            "slopes": [
+                0.012020766332648465,
+                2.7863890579902773,
+                0.06264407466686016,
+                1.222763456258933,
+                1.5360318811084146,
+                1.7620864995501058,
+                2.08656468286432
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_float_4k_v0.6.1.json b/ffmpeg/model/vmaf_float_4k_v0.6.1.json
new file mode 100644
index 0000000000000000000000000000000000000000..a715d13618e78444fd1d3281880366459ef9abf1
--- /dev/null
+++ b/ffmpeg/model/vmaf_float_4k_v0.6.1.json
@@ -0,0 +1,57 @@
+{
+    "param_dict": {
+        "norm_type": "clip_0to1",
+        "score_clip": [
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+            100.0
+        ],
+        "C": 4.0,
+        "nu": 0.9,
+        "gamma": 0.04
+    },
+    "model_dict": {
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1:0.85006491 2:0.067429096 3:0.52208828 4:0.83957283 5:0.88962492 6:0.9155692 \n-4 1:0.82840588 2:0.067429096 3:0.47898696 4:0.77590082 5:0.82767172 6:0.85864944 \n4 1:0.78384486 2:0.067429096 3:0.52761112 4:0.84813033 5:0.90853934 6:0.93801948 \n-4 1:0.76794198 2:0.067429096 3:0.49155575 4:0.79297779 5:0.85408909 6:0.88775992 \n-4 1:0.74071295 2:0.067429096 3:0.44850836 4:0.72304483 5:0.77871009 6:0.81240572 \n4 1:0.63682623 2:0.067429096 3:0.47643242 4:0.76493774 5:0.83497363 6:0.89569946 \n-4 1:0.61909458 2:0.067429096 3:0.44811738 4:0.71722262 5:0.77852333 6:0.83338043 \n-4 1:0.598791 2:0.067429096 3:0.41455634 4:0.65898565 5:0.7066917 6:0.74905326 \n-4 1:0.45610548 2:0.067429096 3:0.43433493 4:0.68980457 5:0.74420076 6:0.80465634 \n-4 1:0.42128521 2:0.067429096 3:0.41290869 4:0.6515686 5:0.69403079 6:0.74177718 \n-4 1:0.3973199 2:0.067429096 3:0.38324463 4:0.59899705 5:0.62542129 6:0.65364255 \n4 1:0.33929266 2:0.067429096 3:0.40196048 4:0.63234535 5:0.67000461 6:0.73359019 \n4 1:0.30717303 2:0.067429096 3:0.36080477 4:0.55822348 5:0.57073663 6:0.59274921 \n4 1:0.93399065 2:0.41032924 3:0.59783417 4:0.84190929 5:0.89750138 6:0.92595957 \n-4 1:0.90595546 2:0.41032924 3:0.52675557 4:0.75232557 5:0.81678388 6:0.85451254 \n4 1:0.86884349 2:0.41032924 3:0.54882568 4:0.79721591 5:0.86027193 6:0.89474014 \n4 1:0.83688316 2:0.41032924 3:0.48353911 4:0.70508019 5:0.770587 6:0.80951258 \n-4 1:0.79909048 2:0.41032924 3:0.42019162 4:0.60634089 5:0.66016059 6:0.69152126 \n4 1:0.81190475 2:0.41032924 3:0.49259836 4:0.7117051 5:0.78203532 6:0.82516406 \n4 1:0.74851584 2:0.41032924 3:0.45030562 4:0.6405497 5:0.71098466 6:0.75519602 \n-0.1291220645620671 1:0.70811815 2:0.41032924 3:0.38732716 4:0.54017845 5:0.59142454 6:0.62173185 \n-4 1:0.65812028 2:0.41032924 3:0.32785534 4:0.44278414 5:0.46803981 6:0.47218162 \n4 1:0.61340029 2:0.41032924 3:0.39943043 4:0.54621466 5:0.59971792 6:0.64499079 \n4 1:0.56718004 2:0.41032924 3:0.34225148 4:0.45255833 5:0.47917361 6:0.49550478 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4:0.57601896 5:0.65321265 6:0.69799032 \n-4 1:0.54225634 2:0.14610739 3:0.27770782 4:0.51923537 5:0.57477828 6:0.59501544 \n4 1:0.47989563 2:0.14610739 3:0.30820332 4:0.58503378 5:0.66456631 6:0.7174928 \n4 1:0.4414077 2:0.14610739 3:0.28822665 4:0.53887566 5:0.59925188 6:0.62987117 \n-4 1:0.39949501 2:0.14610739 3:0.26598279 4:0.48912153 5:0.52873127 6:0.53229307 \n4 1:0.39206975 2:0.14610739 3:0.29566289 4:0.55497136 5:0.62126765 6:0.66418112 \n4 1:0.36544059 2:0.14610739 3:0.2785156 4:0.5155536 5:0.56455807 6:0.58211923 \n",
+        "norm_type": "linear_rescale",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "feature_names": [
+            "VMAF_feature_adm2_score",
+            "VMAF_feature_motion2_score",
+            "VMAF_feature_vif_scale0_score",
+            "VMAF_feature_vif_scale1_score",
+            "VMAF_feature_vif_scale2_score",
+            "VMAF_feature_vif_scale3_score"
+        ],
+        "intercepts": [
+            -0.31191973282964003,
+            -0.8536192302086182,
+            -0.01336836451078975,
+            -0.09603743694887917,
+            -0.21890356649141152,
+            -0.35835059999617175,
+            -0.5373563330683786
+        ],
+        "model_type": "LIBSVMNUSVR",
+        "slopes": [
+            0.012388059998472608,
+            1.853012066458466,
+            0.05141551931924402,
+            1.0960374437054892,
+            1.2189036205165853,
+            1.3583508615652835,
+            1.5373567703674345
+        ],
+        "feature_dict": {
+            "VMAF_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_float_b_v0.6.3.json b/ffmpeg/model/vmaf_float_b_v0.6.3.json
new file mode 100644
index 0000000000000000000000000000000000000000..991934fdc97427470229ce04fe101a6968d7293b
--- /dev/null
+++ b/ffmpeg/model/vmaf_float_b_v0.6.3.json
@@ -0,0 +1,1472 @@
+{
+    "0": {
+        "param_dict": {
+            "C": 4.0,
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 210\nrho -1.38271\nSV\n-4 1:0.69605554 2:0.34681232 3:0.093755557 4:0.60913934 5:0.69117362 6:0.73495824 \n4 1:0.89192404 2:0.49612229 3:0.59146724 4:0.78105663 5:0.84916292 6:0.8882561 \n4 1:0.91737037 2:0.49612229 3:0.66823667 4:0.86050887 5:0.90873162 6:0.93335071 \n4 1:0.2214182 2:0.49612229 3:0.10534315 4:-1.110223e-16 6:2.220446e-16 \n4 1:0.3594872 2:0.49612229 3:0.14024497 4:0.074708413 5:0.10231651 6:0.1259153 \n4 1:0.67482533 2:0.49612229 3:0.35268026 4:0.4805681 5:0.59603341 6:0.67408692 \n4 1:0.61342581 2:0.49612229 3:0.27561601 4:0.33977371 5:0.4325213 6:0.50244952 \n4 1:0.5343717 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.79391726 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n4 1:0.73867648 2:0.49612229 3:0.35967401 4:0.47825205 5:0.57045236 6:0.63752441 \n4 1:0.67022121 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 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+            },
+            "feature_dict": {
+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "p0": 1.70674692,
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+                "p0": 1.70674692,
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -1.778561646908718,
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+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
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+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+    "5": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "num_models": 21,
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+                "p0": 1.70674692,
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+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "num_models": 21,
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+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "p0": 1.70674692,
+                "p1": 1.72643844
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+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "p0": 1.70674692,
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+                "p0": 1.70674692,
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+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 212\nrho -0.953329\nSV\n4 1:0.71492133 2:0.42532178 3:0.31296983 4:0.60525302 5:0.69243388 6:0.7432587 \n-4 1:0.77257175 2:0.08765484 3:0.5597726 4:0.80653689 5:0.88996341 6:0.92691132 \n4 1:0.56142653 2:0.49739676 3:0.24752355 4:0.28326524 5:0.33261781 6:0.37104424 \n4 1:0.61928338 2:0.22767235 3:0.15963705 4:0.51010642 5:0.59283393 6:0.63883591 \n4 1:0.79670443 2:0.54342577 3:0.26295318 4:0.6905031 5:0.79291823 6:0.84469464 \n-4 1:0.71258735 2:0.22767235 3:0.1864032 4:0.58471122 5:0.67581508 6:0.72558613 \n-4 1:0.57776221 2:0.08765484 3:0.42071301 4:0.56376512 5:0.66454599 6:0.741236 \n4 1:0.66777856 2:0.42532178 3:0.30879992 4:0.60375124 5:0.70097073 6:0.75507206 \n-4 1:0.73815918 2:0.25207203 3:0.29691153 4:0.66166141 5:0.73408074 6:0.77757209 \n4 1:0.98791521 2:0.04579546 3:0.90293444 4:0.99181622 5:0.99642641 6:0.9978864 \n-4 1:0.74999802 2:0.08765484 3:0.52069978 4:0.74484555 5:0.83431246 6:0.87935204 \n-4 1:0.87823623 2:0.20629643 3:0.36755712 4:0.8681203 5:0.93297792 6:0.95700049 \n-4 1:0.88260358 2:0.083369236 3:0.57279245 4:0.85249389 5:0.91751611 6:0.94621989 \n4 1:0.78180974 2:0.04579546 3:0.54174294 4:0.92424698 5:0.96600395 6:0.97868211 \n4 1:0.91728681 2:0.20820673 3:0.45891267 4:0.87823329 5:0.93535353 6:0.95883927 \n4 1:0.54792627 2:0.055921852 3:0.26207179 4:0.59416461 5:0.75957205 6:0.82870539 \n4 1:0.91839373 2:0.04579546 3:0.69472114 4:0.97790884 5:0.9891237 6:0.993277 \n4 1:0.37333711 2:0.23066177 3:0.29022709 4:0.26882214 5:0.30809596 6:0.35304275 \n4 1:0.89291952 2:0.16787772 3:0.69408521 4:0.91495146 5:0.94890261 6:0.96269344 \n4 1:0.28569186 2:0.20629643 3:0.076468978 4:0.29833807 5:0.37989948 6:0.4576277 \n-4 1:0.56800546 2:0.16787772 3:0.5149767 4:0.63026581 5:0.67890679 6:0.69964851 \n-4 1:0.66382463 2:0.93973481 3:0.28594627 4:0.63969879 5:0.73360583 6:0.78380069 \n-4 1:0.68687464 2:0.93973481 3:0.2669659 4:0.56720118 5:0.63868728 6:0.67673331 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+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                "VMAF_feature_motion2_score",
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+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
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+    "12": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
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+            "score_clip": [
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+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                1.222763456258933,
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+    "13": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
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+            "gamma": 0.04
+        },
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "15": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "norm_type": "linear_rescale",
+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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5:0.81124449 6:0.87136343 \n-4 1:0.8048121 2:0.25207203 3:0.3681723 4:0.80658472 5:0.8702283 6:0.90583519 \n4 1:0.67569895 2:0.49739676 3:0.30599867 4:0.39201262 5:0.45927759 6:0.51239284 \n4 1:0.67022121 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 \n-4 1:0.66561759 2:0.083369236 3:0.37833052 4:0.59301482 5:0.71772587 6:0.7905538 \n",
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+                1.222763456258933,
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+    "16": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
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+            "gamma": 0.04
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "p0": 1.70674692,
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+                "p0": 1.70674692,
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+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                "p0": 1.70674692,
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+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 210\nrho -1.68654\nSV\n-4 1:0.66382463 2:0.93973481 3:0.28594627 4:0.63969879 5:0.73360583 6:0.78380069 \n4 1:0.25896526 2:0.04579546 3:0.31879 4:0.45852885 5:0.59717781 6:0.71487885 \n-4 1:0.68687464 2:0.93973481 3:0.2669659 4:0.56720118 5:0.63868728 6:0.67673331 \n4 1:0.78020364 2:0.23066177 3:0.50145055 4:0.66525882 5:0.74327951 6:0.79017822 \n-4 1:0.41563731 2:0.48885268 3:0.2554221 4:0.36916892 5:0.43100226 6:0.50888404 \n-4 1:0.73251944 2:0.15600331 3:0.11085278 4:0.68794624 5:0.80350923 6:0.85660483 \n4 1:0.90795371 2:0.58937038 3:0.58823535 4:0.80035053 5:0.86988422 6:0.90533033 \n-4 1:0.79681394 2:0.083369236 3:0.48094343 4:0.76665994 5:0.86191893 6:0.90760934 \n4 1:1 3:0.83319067 4:0.98956086 5:0.99577089 6:0.99784595 \n4 1:0.34770698 2:0.58937038 3:0.24672569 4:0.24188506 5:0.29544562 6:0.33843061 \n4 1:0.61928338 2:0.22767235 3:0.15963705 4:0.51010642 5:0.59283393 6:0.63883591 \n-4 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+                    "vif_scale2",
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+                    "motion2"
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
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+            "slopes": [
+                0.012020766332648465,
+                2.7863890579902773,
+                0.06264407466686016,
+                1.222763456258933,
+                1.5360318811084146,
+                1.7620864995501058,
+                2.08656468286432
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_float_b_v0.6.3/vmaf_float_b_v0.6.3.json b/ffmpeg/model/vmaf_float_b_v0.6.3/vmaf_float_b_v0.6.3.json
new file mode 100644
index 0000000000000000000000000000000000000000..991934fdc97427470229ce04fe101a6968d7293b
--- /dev/null
+++ b/ffmpeg/model/vmaf_float_b_v0.6.3/vmaf_float_b_v0.6.3.json
@@ -0,0 +1,1472 @@
+{
+    "0": {
+        "param_dict": {
+            "C": 4.0,
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "2": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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5:0.90229375 6:0.92936693 \n-4 1:0.69716201 2:0.25207203 3:0.26283557 4:0.58611788 5:0.65192525 6:0.69015011 \n4 1:0.92683589 2:0.48885268 3:0.55208861 4:0.89938377 5:0.94642982 6:0.96615102 \n4 1:0.78180974 2:0.04579546 3:0.54174294 4:0.92424698 5:0.96600395 6:0.97868211 \n4 1:0.54792627 2:0.055921852 3:0.26207179 4:0.59416461 5:0.75957205 6:0.82870539 \n",
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+    "3": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
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+            "gamma": 0.04
+        },
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "p0": 1.70674692,
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+                "p0": 1.70674692,
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "5": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "norm_type": "linear_rescale",
+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                    "vif_scale2",
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+                    "motion2"
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -1.778561646908718,
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+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
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+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                "p0": 1.70674692,
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
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+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "score_clip": [
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+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "10": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "gamma": 0.04
+        },
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "gamma": 0.04
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+                "p0": 1.70674692,
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+            "feature_dict": {
+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "12": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
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+            "gamma": 0.04
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                1.222763456258933,
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+    "13": {
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+            "score_transform": {
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+                "p0": 1.70674692,
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+            "num_models": 21,
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+            "gamma": 0.04
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
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+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                    "vif_scale2",
+                    "vif_scale3",
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+                    "motion2"
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "gamma": 0.04
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+                "p0": 1.70674692,
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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+                "p0": 1.70674692,
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 211\nrho -1.00499\nSV\n-4 1:0.51012298 2:0.25207203 3:0.2005129 4:0.41516485 5:0.45282017 6:0.47396143 \n4 1:0.78020364 2:0.23066177 3:0.50145055 4:0.66525882 5:0.74327951 6:0.79017822 \n-4 1:0.47722492 2:0.014623935 3:0.75468972 4:0.76017077 5:0.83753774 6:0.92265059 \n4 1:0.90420201 2:0.15600331 3:0.19693206 4:0.86294641 5:0.92990351 6:0.95498998 \n4 1:0.40588686 2:0.42532178 3:0.20589097 4:0.35241209 5:0.40358156 6:0.42577381 \n-4 1:0.88260358 2:0.083369236 3:0.57279245 4:0.85249389 5:0.91751611 6:0.94621989 \n-4 1:0.51603659 2:1 3:0.14452095 4:0.31406915 5:0.38353445 6:0.42653517 \n4 1:0.78333908 2:0.20629643 3:0.24707248 4:0.72284103 5:0.83178838 6:0.88053503 \n4 1:0.79391726 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n4 1:0.29443857 2:0.055921852 3:0.19401703 4:0.41679982 5:0.61495039 6:0.74140301 \n-4 1:0.68443073 2:0.047285912 3:0.44652268 4:0.77691812 5:0.81043483 6:0.8177009 \n-4 1:0.72319868 2:0.16787772 3:0.57600091 4:0.75310216 5:0.81471966 6:0.84249923 \n4 1:0.61928338 2:0.22767235 3:0.15963705 4:0.51010642 5:0.59283393 6:0.63883591 \n-4 1:0.74999802 2:0.08765484 3:0.52069978 4:0.74484555 5:0.83431246 6:0.87935204 \n-4 1:0.40634904 2:0.04579546 3:0.35412414 4:0.55926446 5:0.70175505 6:0.79649177 \n4 1:0.40588686 2:0.42532178 3:0.20589097 4:0.35241209 5:0.40358156 6:0.42577381 \n-4 1:0.91951481 2:0.16787772 3:0.7239389 4:0.94244479 5:0.9681932 6:0.97806033 \n-4 1:0.70300609 2:0.15600331 3:0.091457045 4:0.60849701 5:0.72282659 6:0.78137183 \n-4 1:0.60283702 2:0.083369236 3:0.33229353 4:0.48675881 5:0.60141743 6:0.67458413 \n4 1:0.6092064 2:0.58937038 3:0.34931828 4:0.4519606 5:0.54893247 6:0.61355219 \n4 1:0.87998127 2:0.15600331 3:0.1625414 4:0.81948421 5:0.90185357 6:0.9347395 \n4 1:0.67569895 2:0.49739676 3:0.30599867 4:0.39201262 5:0.45927759 6:0.51239284 \n4 1:0.57348929 2:0.42532178 3:0.24033766 4:0.43855753 5:0.50243186 6:0.53322825 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6:0.96269344 \n4 1:0.70099226 2:0.20820673 3:0.31094767 4:0.6676259 5:0.77726116 6:0.83518027 \n-4 1:0.91951481 2:0.16787772 3:0.7239389 4:0.94244479 5:0.9681932 6:0.97806033 \n-4 1:0.69517962 2:0.083369236 3:0.36350305 4:0.54888271 5:0.66506794 6:0.73685112 \n4 1:0.70099226 2:0.20820673 3:0.31094767 4:0.6676259 5:0.77726116 6:0.83518027 \n4 1:0.73710984 2:0.23066177 3:0.49544357 4:0.66648649 5:0.76052819 6:0.81482311 \n4 1:0.85559183 2:0.20629643 3:0.30562098 4:0.80541317 5:0.89285836 6:0.92907353 \n4 1:0.71284767 2:0.22767235 3:0.2263303 4:0.68859985 5:0.78706365 6:0.83662428 \n-4 1:0.91785848 2:0.083369236 3:0.63999999 4:0.90398906 5:0.94897505 6:0.96762621 \n4 1:0.78101613 2:0.055921852 3:0.42192974 4:0.86711004 5:0.94030868 6:0.96084539 \n4 1:0.71284767 2:0.22767235 3:0.2263303 4:0.68859985 5:0.78706365 6:0.83662428 \n4 1:0.90795371 2:0.58937038 3:0.58823535 4:0.80035053 5:0.86988422 6:0.90533033 \n4 1:0.91341872 3:0.45198963 4:0.97703695 5:0.9907273 6:0.99510256 \n4 1:0.90057657 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\n2.496021656464428 1:0.37333711 2:0.23066177 3:0.29022709 4:0.26882214 5:0.30809596 6:0.35304275 \n4 1:0.90420201 2:0.15600331 3:0.19693206 4:0.86294641 5:0.92990351 6:0.95498998 \n-4 1:0.52033349 2:0.48885268 3:0.27824915 4:0.42915458 5:0.50850476 6:0.58585271 \n-4 1:0.65966561 2:0.20820673 3:0.27420721 4:0.57889989 5:0.68485118 6:0.74837036 \n-4 1:0.57776221 2:0.08765484 3:0.42071301 4:0.56376512 5:0.66454599 6:0.741236 \n4 1:0.92683589 2:0.48885268 3:0.55208861 4:0.89938377 5:0.94642982 6:0.96615102 \n4 1:0.62552631 2:0.49739676 3:0.30895604 4:0.40532955 5:0.48355121 6:0.54476585 \n4 1:0.70099226 2:0.20820673 3:0.31094767 4:0.6676259 5:0.77726116 6:0.83518027 \n-4 1:0.74565796 2:0.15600331 3:0.089218917 4:0.58797907 5:0.69284768 6:0.74971699 \n4 1:0.5343717 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.85877443 2:0.42532178 3:0.43562507 4:0.80721931 5:0.87934044 6:0.91434143 \n4 1:0.54792627 2:0.055921852 3:0.26207179 4:0.59416461 5:0.75957205 6:0.82870539 \n-4 1:0.78167533 2:0.15600331 3:0.11289462 4:0.67598462 5:0.78117168 6:0.83259364 \n-4 1:0.80929502 2:0.08765484 3:0.52947327 4:0.7501341 5:0.82294191 6:0.86264385 \n-4 1:0.38478895 2:0.083369236 3:0.28184137 4:0.37025203 5:0.46733936 6:0.53517338 \n-4 1:0.82949905 2:0.047285912 3:0.51559706 4:0.90512389 5:0.93743101 6:0.9492968 \n-4 1:0.76258425 2:0.16787772 3:0.60695536 4:0.80906778 5:0.87125816 6:0.89810007 \n-4 1:0.70997536 2:0.083369236 3:0.42718441 4:0.69347659 5:0.81124449 6:0.87136343 \n4 1:0.67569895 2:0.49739676 3:0.30599867 4:0.39201262 5:0.45927759 6:0.51239284 \n4 1:0.75700132 2:1 3:0.28883701 4:0.65284485 5:0.75623242 6:0.81297442 \n-4 1:0.77257175 2:0.08765484 3:0.5597726 4:0.80653689 5:0.88996341 6:0.92691132 \n4 1:0.83017845 2:0.16787772 3:0.64309172 4:0.86078024 5:0.90892223 6:0.92908907 \n-4 1:0.62949718 2:0.04579546 3:0.44400319 4:0.77920819 5:0.88713866 6:0.92903178 \n3.503978343535571 1:0.32027025 2:0.49739676 3:0.17094319 4:0.12195679 5:0.13277563 6:0.14165413 \n-4 1:0.73985421 2:0.04579546 3:0.499439 4:0.84012074 5:0.90229375 6:0.92936693 \n4 1:0.62437406 2:1 3:0.18559792 4:0.41535212 5:0.50422336 6:0.56173557 \n-4 1:0.4874691 2:0.23066177 3:0.32329421 4:0.33686197 5:0.39456977 6:0.44944683 \n4 1:0.62552631 2:0.49739676 3:0.30895604 4:0.40532955 5:0.48355121 6:0.54476585 \n4 1:0.39257764 2:0.22767235 3:0.12019254 4:0.3951559 5:0.44657802 6:0.46771549 \n-4 1:0.69816754 2:0.34681232 3:0.11526222 4:0.68549511 5:0.78556255 6:0.83507583 \n-4 1:0.69891028 2:0.20820673 3:0.26679137 4:0.55816547 5:0.65579282 6:0.71593631 \n4 1:0.72746732 2:0.23066177 3:0.43952897 4:0.55736023 5:0.63319876 6:0.68402869 \n4 1:0.87998127 2:0.15600331 3:0.1625414 4:0.81948421 5:0.90185357 6:0.9347395 \n4 1:0.77998422 2:0.49739676 3:0.43832146 4:0.63397606 5:0.7240692 6:0.78367237 \n4 1:0.7890525 2:0.20820673 3:0.3510016 4:0.74206651 5:0.83508543 6:0.88101902 \n-4 1:0.4874691 2:0.23066177 3:0.32329421 4:0.33686197 5:0.39456977 6:0.44944683 \n-4 1:0.69518774 2:0.20629643 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+    "19": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "gamma": 0.04
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+                "p0": 1.70674692,
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+            },
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+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "BOOTSTRAP_LIBSVMNUSVR",
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diff --git a/ffmpeg/model/vmaf_float_v0.6.1.json b/ffmpeg/model/vmaf_float_v0.6.1.json
new file mode 100644
index 0000000000000000000000000000000000000000..e6d14f6701850e50d607634e755ae78303c52bf8
--- /dev/null
+++ b/ffmpeg/model/vmaf_float_v0.6.1.json
@@ -0,0 +1,69 @@
+{
+    "param_dict": {
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+        "score_transform": {
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+            "VMAF_feature_motion2_score",
+            "VMAF_feature_vif_scale0_score",
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+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_float_v0.6.1.pkl b/ffmpeg/model/vmaf_float_v0.6.1.pkl
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--- /dev/null
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@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5bc3153113be986e919d6135c6c4e0506b0d260f6b28407642faf8c4708fba80
+size 1153
diff --git a/ffmpeg/model/vmaf_float_v0.6.1.pkl.model b/ffmpeg/model/vmaf_float_v0.6.1.pkl.model
new file mode 100644
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--- /dev/null
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@@ -0,0 +1,3 @@
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diff --git a/ffmpeg/model/vmaf_float_v0.6.1neg.json b/ffmpeg/model/vmaf_float_v0.6.1neg.json
new file mode 100644
index 0000000000000000000000000000000000000000..4a02269f74cece2000c37086374c0ec1426f3081
--- /dev/null
+++ b/ffmpeg/model/vmaf_float_v0.6.1neg.json
@@ -0,0 +1,87 @@
+{
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+        "feature_dict": {
+            "VMAF_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_float_v0.6.1neg.pkl b/ffmpeg/model/vmaf_float_v0.6.1neg.pkl
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--- /dev/null
+++ b/ffmpeg/model/vmaf_float_v0.6.1neg.pkl
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:84ee3c26f79e1fef45f95b79bd97cc42b34d7064bfcc50ac3c297b47a0e9e449
+size 946
diff --git a/ffmpeg/model/vmaf_float_v0.6.1neg.pkl.model b/ffmpeg/model/vmaf_float_v0.6.1neg.pkl.model
new file mode 100644
index 0000000000000000000000000000000000000000..870244dc93d87e707db856d00b042ce392e7c4a8
--- /dev/null
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@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:e5a590c483ebec388aa0c5ecc88aeda354a0e4fcd94b52db0cc4d4c1ba17c29d
+size 17045
diff --git a/ffmpeg/model/vmaf_rb_v0.6.2/vmaf_rb_v0.6.2.json b/ffmpeg/model/vmaf_rb_v0.6.2/vmaf_rb_v0.6.2.json
new file mode 100644
index 0000000000000000000000000000000000000000..9bb083fb46008e5c731ecb5410d52d5cd3a3cb99
--- /dev/null
+++ b/ffmpeg/model/vmaf_rb_v0.6.2/vmaf_rb_v0.6.2.json
@@ -0,0 +1,1402 @@
+{
+    "0": {
+        "param_dict": {
+            "C": 4.0,
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
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+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                -1.778561646908718,
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+                -0.7577185792093722,
+                -1.083428597549764
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                "p0": 1.70674692,
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.222763456258933,
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+    "2": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 20,
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+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.222763456258933,
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+    "4": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 20,
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+            "gamma": 0.04
+        },
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                2.7863890579902773,
+                0.06264407466686016,
+                1.222763456258933,
+                1.5360318811084146,
+                1.7620864995501058,
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+    },
+    "6": {
+        "param_dict": {
+            "C": 4.0,
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
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+            "score_clip": [
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+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+    },
+    "7": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.1728125095425364,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.222763456258933,
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+    "8": {
+        "param_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 20,
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+            "gamma": 0.04
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 212\nrho -0.426319\nSV\n-4 1:0.69605554 2:0.34681232 3:0.093755557 4:0.60913934 5:0.69117362 6:0.73495824 \n-0.8599582041923656 1:0.89192404 2:0.49612229 3:0.59146724 4:0.78105663 5:0.84916292 6:0.8882561 \n-4 1:0.91737037 2:0.49612229 3:0.66823667 4:0.86050887 5:0.90873162 6:0.93335071 \n4 1:0.2214182 2:0.49612229 3:0.10534315 4:-1.110223e-16 6:2.220446e-16 \n-4 1:0.3594872 2:0.49612229 3:0.14024497 4:0.074708413 5:0.10231651 6:0.1259153 \n4 1:0.67482533 2:0.49612229 3:0.35268026 4:0.4805681 5:0.59603341 6:0.67408692 \n-4 1:0.61342581 2:0.49612229 3:0.27561601 4:0.33977371 5:0.4325213 6:0.50244952 \n4 1:0.5343717 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.79391726 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n4 1:0.67022121 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 \n-4 1:0.90057657 2:0.23066177 3:0.65873851 4:0.86090402 5:0.90661213 6:0.93008753 \n-4 1:0.93011029 2:0.23066177 3:0.71439481 4:0.90904598 5:0.94146542 6:0.95674338 \n-4 1:0.37333711 2:0.23066177 3:0.29022709 4:0.26882214 5:0.30809596 6:0.35304275 \n4 1:0.4874691 2:0.23066177 3:0.32329421 4:0.33686197 5:0.39456977 6:0.44944683 \n4 1:0.73710984 2:0.23066177 3:0.49544357 4:0.66648649 5:0.76052819 6:0.81482311 \n4 1:0.69004118 2:0.23066177 3:0.43933868 4:0.56327049 5:0.65339511 6:0.71348696 \n4 1:0.62949394 2:0.23066177 3:0.3800888 4:0.44927578 5:0.52327759 6:0.57907725 \n4 1:0.82277534 2:0.23066177 3:0.56208506 4:0.76164281 5:0.83176644 6:0.86914911 \n4 1:0.78020364 2:0.23066177 3:0.50145055 4:0.66525882 5:0.74327951 6:0.79017822 \n-4 1:0.72746732 2:0.23066177 3:0.43952897 4:0.55736023 5:0.63319876 6:0.68402869 \n4 1:0.91341872 3:0.45198963 4:0.97703695 5:0.9907273 6:0.99510256 \n4 4:0.10344019 5:0.34323945 6:0.63855969 \n4 1:0.18980624 3:0.034330388 4:0.25480402 5:0.54197045 6:0.78020579 \n-4 1:0.4730794 3:0.11866359 4:0.58816959 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\n-2.840572857988902 1:0.43289262 2:0.49739676 3:0.19942282 4:0.18051614 5:0.20657779 6:0.22630829 \n4 1:0.67721467 2:0.49739676 3:0.37192301 4:0.52750491 5:0.62426522 6:0.6929947 \n4 1:0.62552631 2:0.49739676 3:0.30895604 4:0.40532955 5:0.48355121 6:0.54476585 \n4 1:0.56142653 2:0.49739676 3:0.24752355 4:0.28326524 5:0.33261781 6:0.37104424 \n-4 1:0.77998422 2:0.49739676 3:0.43832146 4:0.63397606 5:0.7240692 6:0.78367237 \n-4 1:0.67569895 2:0.49739676 3:0.30599867 4:0.39201262 5:0.45927759 6:0.51239284 \n-4 1:0.91839373 2:0.04579546 3:0.69472114 4:0.97790884 5:0.9891237 6:0.993277 \n4 1:0.98791521 2:0.04579546 3:0.90293444 4:0.99181622 5:0.99642641 6:0.9978864 \n-4 1:0.25896526 2:0.04579546 3:0.31879 4:0.45852885 5:0.59717781 6:0.71487885 \n-4 1:0.40634904 2:0.04579546 3:0.35412414 4:0.55926446 5:0.70175505 6:0.79649177 \n4 1:0.6483368 2:0.04579546 3:0.45989947 4:0.82115248 5:0.92520734 6:0.9594384 \n4 1:0.59976014 2:0.04579546 3:0.42297435 4:0.72390263 5:0.83364665 6:0.88344569 \n-4 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+    "10": {
+        "param_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -1.778561646908718,
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+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+    "12": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 20,
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+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 209\nrho -1.05974\nSV\n-4 1:0.69605554 2:0.34681232 3:0.093755557 4:0.60913934 5:0.69117362 6:0.73495824 \n4 1:0.89192404 2:0.49612229 3:0.59146724 4:0.78105663 5:0.84916292 6:0.8882561 \n4 1:0.2214182 2:0.49612229 3:0.10534315 4:-1.110223e-16 6:2.220446e-16 \n-4 1:0.3594872 2:0.49612229 3:0.14024497 4:0.074708413 5:0.10231651 6:0.1259153 \n4 1:0.67482533 2:0.49612229 3:0.35268026 4:0.4805681 5:0.59603341 6:0.67408692 \n-4 1:0.5343717 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.79391726 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n-4 1:0.73867648 2:0.49612229 3:0.35967401 4:0.47825205 5:0.57045236 6:0.63752441 \n4 1:0.67022121 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 \n-4 1:0.90057657 2:0.23066177 3:0.65873851 4:0.86090402 5:0.90661213 6:0.93008753 \n-4 1:0.93011029 2:0.23066177 3:0.71439481 4:0.90904598 5:0.94146542 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+                "p0": 1.70674692,
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+            },
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "norm_type": "linear_rescale",
+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "p1": 1.72643844
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+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 20,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -1.778561646908718,
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+                -0.1728125095425364,
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+                -0.7577185792093722,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.222763456258933,
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+    },
+    "18": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
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+            "score_clip": [
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+            ],
+            "num_models": 20,
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+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "19": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 20,
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+            "gamma": 0.04
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+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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diff --git a/ffmpeg/model/vmaf_rb_v0.6.2/vmaf_rb_v0.6.2.pkl.0019.model b/ffmpeg/model/vmaf_rb_v0.6.2/vmaf_rb_v0.6.2.pkl.0019.model
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+version https://git-lfs.github.com/spec/v1
+oid sha256:c54f2746647d4bd53acc49813ad6f519d7fafdd18820cbb81f8a1072cb840b1b
+size 16947
diff --git a/ffmpeg/model/vmaf_rb_v0.6.2/vmaf_rb_v0.6.2.pkl.model b/ffmpeg/model/vmaf_rb_v0.6.2/vmaf_rb_v0.6.2.pkl.model
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+version https://git-lfs.github.com/spec/v1
+oid sha256:0c82d6c3881936b9babddb0ecd6b1f6b012a1008a3023f4ffe6ea42e7792eab1
+size 17004
diff --git a/ffmpeg/model/vmaf_rb_v0.6.3/vmaf_rb_v0.6.3.json b/ffmpeg/model/vmaf_rb_v0.6.3/vmaf_rb_v0.6.3.json
new file mode 100644
index 0000000000000000000000000000000000000000..53957f09bbe9b97c8f78e7bb2c46ce56f937655c
--- /dev/null
+++ b/ffmpeg/model/vmaf_rb_v0.6.3/vmaf_rb_v0.6.3.json
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+{
+    "0": {
+        "param_dict": {
+            "C": 4.0,
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "norm_type": "clip_0to1",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
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+            "gamma": 0.04
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+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "VMAF_feature": [
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+                    "vif_scale2",
+                    "vif_scale3",
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+                    "motion2"
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "4": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "gamma": 0.04
+        },
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+                1.222763456258933,
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+    },
+    "6": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
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+            "score_clip": [
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+                100.0
+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
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+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
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+    },
+    "7": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "norm_type": "linear_rescale",
+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+    "8": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 212\nrho -0.426319\nSV\n-4 1:0.69605554 2:0.34681232 3:0.093755557 4:0.60913934 5:0.69117362 6:0.73495824 \n-0.8599582041923656 1:0.89192404 2:0.49612229 3:0.59146724 4:0.78105663 5:0.84916292 6:0.8882561 \n-4 1:0.91737037 2:0.49612229 3:0.66823667 4:0.86050887 5:0.90873162 6:0.93335071 \n4 1:0.2214182 2:0.49612229 3:0.10534315 4:-1.110223e-16 6:2.220446e-16 \n-4 1:0.3594872 2:0.49612229 3:0.14024497 4:0.074708413 5:0.10231651 6:0.1259153 \n4 1:0.67482533 2:0.49612229 3:0.35268026 4:0.4805681 5:0.59603341 6:0.67408692 \n-4 1:0.61342581 2:0.49612229 3:0.27561601 4:0.33977371 5:0.4325213 6:0.50244952 \n4 1:0.5343717 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.79391726 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n4 1:0.67022121 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 \n-4 1:0.90057657 2:0.23066177 3:0.65873851 4:0.86090402 5:0.90661213 6:0.93008753 \n-4 1:0.93011029 2:0.23066177 3:0.71439481 4:0.90904598 5:0.94146542 6:0.95674338 \n-4 1:0.37333711 2:0.23066177 3:0.29022709 4:0.26882214 5:0.30809596 6:0.35304275 \n4 1:0.4874691 2:0.23066177 3:0.32329421 4:0.33686197 5:0.39456977 6:0.44944683 \n4 1:0.73710984 2:0.23066177 3:0.49544357 4:0.66648649 5:0.76052819 6:0.81482311 \n4 1:0.69004118 2:0.23066177 3:0.43933868 4:0.56327049 5:0.65339511 6:0.71348696 \n4 1:0.62949394 2:0.23066177 3:0.3800888 4:0.44927578 5:0.52327759 6:0.57907725 \n4 1:0.82277534 2:0.23066177 3:0.56208506 4:0.76164281 5:0.83176644 6:0.86914911 \n4 1:0.78020364 2:0.23066177 3:0.50145055 4:0.66525882 5:0.74327951 6:0.79017822 \n-4 1:0.72746732 2:0.23066177 3:0.43952897 4:0.55736023 5:0.63319876 6:0.68402869 \n4 1:0.91341872 3:0.45198963 4:0.97703695 5:0.9907273 6:0.99510256 \n4 4:0.10344019 5:0.34323945 6:0.63855969 \n4 1:0.18980624 3:0.034330388 4:0.25480402 5:0.54197045 6:0.78020579 \n-4 1:0.4730794 3:0.11866359 4:0.58816959 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\n-2.840572857988902 1:0.43289262 2:0.49739676 3:0.19942282 4:0.18051614 5:0.20657779 6:0.22630829 \n4 1:0.67721467 2:0.49739676 3:0.37192301 4:0.52750491 5:0.62426522 6:0.6929947 \n4 1:0.62552631 2:0.49739676 3:0.30895604 4:0.40532955 5:0.48355121 6:0.54476585 \n4 1:0.56142653 2:0.49739676 3:0.24752355 4:0.28326524 5:0.33261781 6:0.37104424 \n-4 1:0.77998422 2:0.49739676 3:0.43832146 4:0.63397606 5:0.7240692 6:0.78367237 \n-4 1:0.67569895 2:0.49739676 3:0.30599867 4:0.39201262 5:0.45927759 6:0.51239284 \n-4 1:0.91839373 2:0.04579546 3:0.69472114 4:0.97790884 5:0.9891237 6:0.993277 \n4 1:0.98791521 2:0.04579546 3:0.90293444 4:0.99181622 5:0.99642641 6:0.9978864 \n-4 1:0.25896526 2:0.04579546 3:0.31879 4:0.45852885 5:0.59717781 6:0.71487885 \n-4 1:0.40634904 2:0.04579546 3:0.35412414 4:0.55926446 5:0.70175505 6:0.79649177 \n4 1:0.6483368 2:0.04579546 3:0.45989947 4:0.82115248 5:0.92520734 6:0.9594384 \n4 1:0.59976014 2:0.04579546 3:0.42297435 4:0.72390263 5:0.83364665 6:0.88344569 \n-4 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+    "10": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+                -1.778561646908718,
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+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+    "12": {
+        "param_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
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+            "gamma": 0.04
+        },
+        "model_dict": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
+                -0.3092981927591963,
+                -1.778561646908718,
+                -0.003017198086831897,
+                -0.1728125095425364,
+                -0.5294309090081222,
+                -0.7577185792093722,
+                -1.083428597549764
+            ],
+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
+            "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 209\nrho -1.05974\nSV\n-4 1:0.69605554 2:0.34681232 3:0.093755557 4:0.60913934 5:0.69117362 6:0.73495824 \n4 1:0.89192404 2:0.49612229 3:0.59146724 4:0.78105663 5:0.84916292 6:0.8882561 \n4 1:0.2214182 2:0.49612229 3:0.10534315 4:-1.110223e-16 6:2.220446e-16 \n-4 1:0.3594872 2:0.49612229 3:0.14024497 4:0.074708413 5:0.10231651 6:0.1259153 \n4 1:0.67482533 2:0.49612229 3:0.35268026 4:0.4805681 5:0.59603341 6:0.67408692 \n-4 1:0.5343717 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.79391726 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n-4 1:0.73867648 2:0.49612229 3:0.35967401 4:0.47825205 5:0.57045236 6:0.63752441 \n4 1:0.67022121 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 \n-4 1:0.90057657 2:0.23066177 3:0.65873851 4:0.86090402 5:0.90661213 6:0.93008753 \n-4 1:0.93011029 2:0.23066177 3:0.71439481 4:0.90904598 5:0.94146542 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+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
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+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "norm_type": "linear_rescale",
+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            "norm_type": "clip_0to1",
+            "score_clip": [
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+            ],
+            "num_models": 21,
+            "nu": 0.9,
+            "gamma": 0.04
+        },
+        "model_dict": {
+            "score_transform": {
+                "p2": -0.00705305,
+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
+            },
+            "norm_type": "linear_rescale",
+            "score_clip": [
+                0.0,
+                100.0
+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
+            ],
+            "intercepts": [
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+            "model_type": "RESIDUEBOOTSTRAP_LIBSVMNUSVR",
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+    "18": {
+        "param_dict": {
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+            "score_transform": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "score_clip": [
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+            "num_models": 21,
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+            "gamma": 0.04
+        },
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
+                "p1": 1.72643844
+            },
+            "feature_dict": {
+                "VMAF_feature": [
+                    "vif_scale0",
+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
+                ]
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+            "score_clip": [
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+            ],
+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+    "19": {
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+                "out_gte_in": "true",
+                "p0": 1.70674692,
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+            "num_models": 21,
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+                "p0": 1.70674692,
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+            },
+            "feature_dict": {
+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
+                "VMAF_feature_adm2_score",
+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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+            },
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+                "VMAF_feature": [
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+                    "vif_scale1",
+                    "vif_scale2",
+                    "vif_scale3",
+                    "adm2",
+                    "motion2"
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+            "score_clip": [
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+            "feature_names": [
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+                "VMAF_feature_motion2_score",
+                "VMAF_feature_vif_scale0_score",
+                "VMAF_feature_vif_scale1_score",
+                "VMAF_feature_vif_scale2_score",
+                "VMAF_feature_vif_scale3_score"
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6:0.88419439 \n-4 1:0.67287449 2:0.047285912 3:0.44652268 4:0.77691812 5:0.81043483 6:0.8177009 \n-4 1:0.8023177 2:0.047285912 3:0.51559706 4:0.90512389 5:0.93743101 6:0.9492968 \n-4 1:0.76751376 2:0.047285912 3:0.49225957 4:0.86357299 5:0.89948127 6:0.91221155 \n-4 1:0.72124785 2:0.047285912 3:0.46606653 4:0.81323145 5:0.84847474 6:0.85892657 \n",
+        "score_transform": {
+            "p2": -0.00705305,
+            "out_gte_in": "true",
+            "p0": 1.70674692,
+            "p1": 1.72643844
+        },
+        "norm_type": "linear_rescale",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "feature_names": [
+            "VMAF_integer_feature_adm2_score",
+            "VMAF_integer_feature_motion2_score",
+            "VMAF_integer_feature_vif_scale0_score",
+            "VMAF_integer_feature_vif_scale1_score",
+            "VMAF_integer_feature_vif_scale2_score",
+            "VMAF_integer_feature_vif_scale3_score"
+        ],
+        "intercepts": [
+            -0.3092981927591963,
+            -1.7993968597186747,
+            -0.003017198086831897,
+            -0.1728125095425364,
+            -0.5294309090081222,
+            -0.7577185792093722,
+            -1.083428597549764
+        ],
+        "model_type": "LIBSVMNUSVR",
+        "slopes": [
+            0.012020766332648465,
+            2.8098077502505414,
+            0.06264407466686016,
+            1.222763456258933,
+            1.5360318811084146,
+            1.7620864995501058,
+            2.08656468286432
+        ],
+        "feature_dict": {
+            "VMAF_integer_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/model/vmaf_v0.6.1neg.json b/ffmpeg/model/vmaf_v0.6.1neg.json
new file mode 100644
index 0000000000000000000000000000000000000000..3df5f36f447533b8b9bf2a4c56d84fc7d2849a54
--- /dev/null
+++ b/ffmpeg/model/vmaf_v0.6.1neg.json
@@ -0,0 +1,87 @@
+{
+    "param_dict": {
+        "C": 4.0,
+        "score_transform": {
+            "p2": -0.00705305,
+            "out_gte_in": "true",
+            "p0": 1.70674692,
+            "p1": 1.72643844
+        },
+        "norm_type": "clip_0to1",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "nu": 0.9,
+        "gamma": 0.04
+    },
+    "model_dict": {
+        "slopes": [
+            0.012020766332648465,
+            2.8098077502505414,
+            0.06264407466686016,
+            1.222763456258933,
+            1.5360318811084146,
+            1.7620864995501058,
+            2.08656468286432
+        ],
+        "score_transform": {
+            "p2": -0.00705305,
+            "out_gte_in": "true",
+            "p0": 1.70674692,
+            "p1": 1.72643844
+        },
+        "feature_opts_dicts": [
+            {
+                "adm_enhn_gain_limit": 1.0
+            },
+            {},
+            {
+                "vif_enhn_gain_limit": 1.0
+            },
+            {
+                "vif_enhn_gain_limit": 1.0
+            },
+            {
+                "vif_enhn_gain_limit": 1.0
+            },
+            {
+                "vif_enhn_gain_limit": 1.0
+            }
+        ],
+        "norm_type": "linear_rescale",
+        "score_clip": [
+            0.0,
+            100.0
+        ],
+        "feature_names": [
+            "VMAF_integer_feature_adm2_score",
+            "VMAF_integer_feature_motion2_score",
+            "VMAF_integer_feature_vif_scale0_score",
+            "VMAF_integer_feature_vif_scale1_score",
+            "VMAF_integer_feature_vif_scale2_score",
+            "VMAF_integer_feature_vif_scale3_score"
+        ],
+        "intercepts": [
+            -0.3092981927591963,
+            -1.7993968597186747,
+            -0.003017198086831897,
+            -0.1728125095425364,
+            -0.5294309090081222,
+            -0.7577185792093722,
+            -1.083428597549764
+        ],
+        "model_type": "LIBSVMNUSVR",
+        "model": "svm_type nu_svr\nkernel_type rbf\ngamma 0.04\nnr_class 2\ntotal_sv 211\nrho -1.33133\nSV\n-4 1:0.65734273 2:0.34681232 3:0.093755557 4:0.60913934 5:0.69117362 6:0.73495824 \n4 1:0.8727433 2:0.49612229 3:0.59146724 4:0.78105663 5:0.84916292 6:0.8882561 \n4 1:0.89890005 2:0.49612229 3:0.66823667 4:0.86050887 5:0.90873162 6:0.93335071 \n4 1:0.20371751 2:0.49612229 3:0.10534315 4:-1.110223e-16 6:2.220446e-16 \n4 1:0.33913836 2:0.49612229 3:0.14024497 4:0.074708413 5:0.10231651 6:0.1259153 \n4 1:0.66426757 2:0.49612229 3:0.35268026 4:0.4805681 5:0.59603341 6:0.67408692 \n4 1:0.59561632 2:0.49612229 3:0.27561601 4:0.33977371 5:0.4325213 6:0.50244952 \n4 1:0.50821444 2:0.49612229 3:0.20276685 4:0.2004308 5:0.25758651 6:0.30054029 \n4 1:0.77877298 2:0.49612229 3:0.444392 4:0.61630491 5:0.71210086 6:0.77386496 \n4 1:0.71666017 2:0.49612229 3:0.35967401 4:0.47825205 5:0.57045236 6:0.63752441 \n4 1:0.64025669 2:0.49612229 3:0.27766156 4:0.33407105 5:0.40732401 6:0.46359154 \n4 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6:0.59069772 \n-4 1:0.49071444 2:1 3:0.14452095 4:0.31406915 5:0.38353445 6:0.42653517 \n4 1:0.73255545 2:1 3:0.28883701 4:0.65284485 5:0.75623242 6:0.81297442 \n0.4082706381617505 1:0.67015395 2:1 3:0.2367756 4:0.5367057 5:0.64063877 6:0.70451767 \n-4 1:0.84450653 2:0.083369236 3:0.57279245 4:0.85249389 5:0.91751611 6:0.94621989 \n-4 1:0.39559773 2:0.083369236 3:0.28184137 4:0.37025203 5:0.46733936 6:0.53517338 \n-4 1:0.70621493 2:0.083369236 3:0.42718441 4:0.69347659 5:0.81124449 6:0.87136343 \n-4 1:0.65615861 2:0.083369236 3:0.37833052 4:0.59301482 5:0.71772587 6:0.7905538 \n-4 1:0.58837863 2:0.083369236 3:0.33229353 4:0.48675881 5:0.60141743 6:0.67458413 \n-4 1:0.77687144 2:0.083369236 3:0.48094343 4:0.76665994 5:0.86191893 6:0.90760934 \n-1.966116876631112 1:0.72849768 2:0.083369236 3:0.42082971 4:0.66591147 5:0.77995959 6:0.84260661 \n-3.906831378063804 1:0.66320082 2:0.083369236 3:0.36350305 4:0.54888271 5:0.66506794 6:0.73685112 \n4 1:0.84500499 2:0.42532178 3:0.43562507 4:0.80721931 5:0.87934044 6:0.91434143 \n4 1:0.8874543 2:0.42532178 3:0.50912639 4:0.87959883 5:0.93223488 6:0.95450335 \n4 1:0.31032192 2:0.42532178 3:0.18976794 4:0.30662908 5:0.34637104 6:0.3661022 \n4 1:0.41026349 2:0.42532178 3:0.20589097 4:0.35241209 5:0.40358156 6:0.42577381 \n4 1:0.67552108 2:0.42532178 3:0.30879992 4:0.60375124 5:0.70097073 6:0.75507206 \n4 1:0.62772585 2:0.42532178 3:0.27349745 4:0.5196735 5:0.60339149 6:0.65103342 \n4 1:0.5741386 2:0.42532178 3:0.24033766 4:0.43855753 5:0.50243186 6:0.53322825 \n4 1:0.7629976 2:0.42532178 3:0.35347476 4:0.69239941 5:0.78245146 6:0.83117443 \n4 1:0.71746409 2:0.42532178 3:0.31296983 4:0.60525302 5:0.69243388 6:0.7432587 \n-4 1:0.73137955 2:0.16787772 3:0.57222383 4:0.74405775 5:0.79993424 6:0.82484891 \n4 1:0.67383121 2:0.58937038 3:0.35481019 4:0.45269287 5:0.53578336 6:0.59116487 \n4 1:0.5905971 2:1 3:0.18559792 4:0.41535212 5:0.50422336 6:0.56173557 \n4 1:0.66157018 2:0.42532178 3:0.27479904 4:0.51802649 5:0.59270541 6:0.63560969 \n-4 1:0.66827754 2:0.54342577 3:0.18169339 4:0.50290989 5:0.59875259 6:0.65332628 \n4 1:0.85027066 2:0.20820673 3:0.40997978 4:0.82462749 5:0.89794736 6:0.93142825 \n4 1:0.87892054 2:0.20820673 3:0.45891267 4:0.87823329 5:0.93535353 6:0.95883927 \n4 1:0.3986268 2:0.20820673 3:0.17753958 4:0.33495583 5:0.39777832 6:0.44399359 \n-4 1:0.48997993 2:0.20820673 3:0.20172681 4:0.39715881 5:0.47368229 6:0.52781628 \n4 1:0.7022939 2:0.20820673 3:0.31094767 4:0.6676259 5:0.77726116 6:0.83518027 \n-4 1:0.65773092 2:0.20820673 3:0.27420721 4:0.57889989 5:0.68485118 6:0.74837036 \n0.2951376518668717 1:0.60031736 2:0.20820673 3:0.23419121 4:0.48018865 5:0.57200972 6:0.63197473 \n4 1:0.77623676 2:0.20820673 3:0.3510016 4:0.74206651 5:0.83508543 6:0.88101902 \n4 1:0.73562396 2:0.20820673 3:0.31004997 4:0.6557112 5:0.75585014 6:0.81164989 \n-4 1:0.67923081 2:0.20820673 3:0.26679137 4:0.55816547 5:0.65579282 6:0.71593631 \n4 1:0.83968539 2:0.54342577 3:0.32439292 4:0.78747769 5:0.87303614 6:0.91271252 \n4 1:0.86656342 2:0.54342577 3:0.37898741 4:0.85252726 5:0.92049615 6:0.94848246 \n-4 1:0.42728303 2:0.54342577 3:0.10123262 4:0.31581962 5:0.38571265 6:0.42827036 \n-4 1:0.63194526 2:0.54342577 3:0.18169045 4:0.51611903 5:0.62179755 6:0.68216176 \n4 1:0.56954706 2:0.54342577 3:0.14271477 4:0.41491191 5:0.50173488 6:0.55220392 \n4 1:0.76753176 2:0.54342577 3:0.26295318 4:0.6905031 5:0.79291823 6:0.84469464 \n-4 1:0.72348649 2:0.54342577 3:0.22334634 4:0.60145902 5:0.70573225 6:0.76318544 \n4 1:0.83584492 2:0.047285912 3:0.53826775 4:0.933335 5:0.95948954 6:0.96870909 \n4 1:0.85530855 2:0.047285912 3:0.55323777 4:0.95113339 5:0.97249918 6:0.9795177 \n-4 1:0.53835734 2:0.047285912 3:0.41965074 4:0.71632669 5:0.73953043 6:0.73487553 \n-4 1:0.59175144 2:0.047285912 3:0.43113594 4:0.74141738 5:0.76929188 6:0.77018949 \n-4 1:0.75962366 2:0.047285912 3:0.49613729 4:0.87838146 5:0.91688438 6:0.93150362 \n-4 1:0.72043129 2:0.047285912 3:0.47217411 4:0.83138845 5:0.8704229 6:0.88419439 \n-4 1:0.67287449 2:0.047285912 3:0.44652268 4:0.77691812 5:0.81043483 6:0.8177009 \n-4 1:0.8023177 2:0.047285912 3:0.51559706 4:0.90512389 5:0.93743101 6:0.9492968 \n-4 1:0.76751376 2:0.047285912 3:0.49225957 4:0.86357299 5:0.89948127 6:0.91221155 \n-4 1:0.72124785 2:0.047285912 3:0.46606653 4:0.81323145 5:0.84847474 6:0.85892657 \n",
+        "feature_dict": {
+            "VMAF_integer_feature": [
+                "vif_scale0",
+                "vif_scale1",
+                "vif_scale2",
+                "vif_scale3",
+                "adm2",
+                "motion2"
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/ffmpeg/qt-faststart b/ffmpeg/qt-faststart
new file mode 100644
index 0000000000000000000000000000000000000000..715d3149db7696deae777c1e1d3e79da9544b853
Binary files /dev/null and b/ffmpeg/qt-faststart differ
diff --git a/ffmpeg/readme.txt b/ffmpeg/readme.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a1574225ab98970cbea085545608cefa3deff035
--- /dev/null
+++ b/ffmpeg/readme.txt
@@ -0,0 +1,67 @@
+
+            ______ ______                                  
+           / ____// ____/____ ___   ____   ___   ____ _
+          / /_   / /_   / __ `__ \ / __ \ / _ \ / __ `/
+         / __/  / __/  / / / / / // /_/ //  __// /_/ /
+        /_/    /_/    /_/ /_/ /_// .___/ \___/ \__, /
+                                /_/           /____/
+
+
+                build: ffmpeg-7.0.1-amd64-static.tar.xz
+              version: 7.0.1
+
+                  gcc: 8.3.0
+                 yasm: 1.3.0.36.ge2569
+                 nasm: 2.15.05
+
+               libaom: 3.2.0-393-g402e264b94
+               libass: 0.17.2
+               libgme: 0.6.3
+               libsrt: 1.4.4
+               libvpx: 1.11.0-30-g888bafc78
+              libvmaf: 2.3.0
+              libx264: 0.164.3191 
+              libx265: 3.5+1-f0c1022b6
+              libxvid: 1.3.7 
+              libwebp: 0.6.1 
+              libzimg: 3.0.3
+              libzvbi: 0.2.36
+             libdav1d: 1.4.2
+            libgnutls: 3.7.2
+            libtheora: 1.2.0alpha1+git
+            libfrei0r: 1.6.1-2
+           libvidstab: 1.20
+          libfreetype: 2.9.1-3+deb10u1
+          libharfbuzz: 3.1.1
+          libopenjpeg: 2.4.0 
+
+              libalsa: 1.2.4
+              libsoxr: 0.1.3
+              libopus: 1.3.1
+             libspeex: 1.2
+            libvorbis: 1.3.7
+           libmp3lame: 3.100 
+        librubberband: 1.8.2
+       libvo-amrwbenc: 0.1.3-1+b1
+    libopencore-amrnb: 0.1.3-2.1+b2
+    libopencore-amrwb: 0.1.3-2.1+b2
+
+
+     Notes:  A limitation of statically linking glibc is the loss of DNS resolution. Installing
+             nscd through your package manager will fix this.
+
+             The vmaf filter needs external files to work- see model/000-README.TXT
+
+
+      This static build is licensed under the GNU General Public License version 3.
+
+      
+      Patreon:  https://www.patreon.com/johnvansickle
+      Paypal:   https://www.paypal.me/johnvansickle 
+      Ethereum: 0x491f0b4bAd15FF178257D9Fa81ce87baa8b6E242 
+      Bitcoin:  3ErDdF5JeG9RMx2DXwXEeunrsc5dVHjmeq 
+      Dogecoin: DH4WZPTjwKh2TarQhkpQrKjHZ9kNTkiMNL
+
+      email: john.vansickle@gmail.com
+      irc:   relaxed @ irc://chat.freenode.net #ffmpeg
+      url:   https://johnvansickle.com/ffmpeg/