static int init_output_stream_encode(OutputStream *ost) { InputStream *ist = get_input_stream(ost); AVCodecContext *enc_ctx = ost->enc_ctx; AVCodecContext *dec_ctx = NULL; AVFormatContext *oc = output_files[ost->file_index]->ctx; int j, ret; set_encoder_id(output_files[ost->file_index], ost); if (ist) { ost->st->disposition = ist->st->disposition; dec_ctx = ist->dec_ctx; enc_ctx->chroma_sample_location = dec_ctx->chroma_sample_location; } else { for (j = 0; j < oc->nb_streams; j++) { AVStream *st = oc->streams[j]; if (st != ost->st && st->codecpar->codec_type == ost->st->codecpar->codec_type) break; } if (j == oc->nb_streams) if (ost->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || ost->st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) ost->st->disposition = AV_DISPOSITION_DEFAULT; } if ((enc_ctx->codec_type == AVMEDIA_TYPE_VIDEO || enc_ctx->codec_type == AVMEDIA_TYPE_AUDIO) && filtergraph_is_simple(ost->filter->graph)) { FilterGraph *fg = ost->filter->graph; if (configure_filtergraph(fg)) { av_log(NULL, AV_LOG_FATAL, "Error opening filters!\n"); exit_program(1); } } if (enc_ctx->codec_type == AVMEDIA_TYPE_VIDEO) { if (!ost->frame_rate.num) ost->frame_rate = av_buffersink_get_frame_rate(ost->filter->filter); if (ist && !ost->frame_rate.num) ost->frame_rate = ist->framerate; if (ist && !ost->frame_rate.num) ost->frame_rate = ist->st->r_frame_rate; if (ist && !ost->frame_rate.num) { ost->frame_rate = (AVRational){25, 1}; av_log(NULL, AV_LOG_WARNING, "No information " "about the input framerate is available. Falling " "back to a default value of 25fps for output stream #%d:%d. Use the -r option " "if you want a different framerate.\n", ost->file_index, ost->index); } // ost->frame_rate = ist->st->avg_frame_rate.num ? ist->st->avg_frame_rate : (AVRational){25, 1}; if (ost->enc && ost->enc->supported_framerates && !ost->force_fps) { int idx = av_find_nearest_q_idx(ost->frame_rate, ost->enc->supported_framerates); ost->frame_rate = ost->enc->supported_framerates[idx]; } // reduce frame rate for mpeg4 to be within the spec limits if (enc_ctx->codec_id == AV_CODEC_ID_MPEG4) { av_reduce(&ost->frame_rate.num, &ost->frame_rate.den, ost->frame_rate.num, ost->frame_rate.den, 65535); } } switch (enc_ctx->codec_type) { case AVMEDIA_TYPE_AUDIO: enc_ctx->sample_fmt = av_buffersink_get_format(ost->filter->filter); if (dec_ctx) enc_ctx->bits_per_raw_sample = FFMIN(dec_ctx->bits_per_raw_sample, av_get_bytes_per_sample(enc_ctx->sample_fmt) << 3); enc_ctx->sample_rate = av_buffersink_get_sample_rate(ost->filter->filter); enc_ctx->channel_layout = av_buffersink_get_channel_layout(ost->filter->filter); enc_ctx->channels = av_buffersink_get_channels(ost->filter->filter); enc_ctx->time_base = (AVRational){ 1, enc_ctx->sample_rate }; break; case AVMEDIA_TYPE_VIDEO: enc_ctx->time_base = av_inv_q(ost->frame_rate); if (!(enc_ctx->time_base.num && enc_ctx->time_base.den)) enc_ctx->time_base = av_buffersink_get_time_base(ost->filter->filter); if ( av_q2d(enc_ctx->time_base) < 0.001 && video_sync_method != VSYNC_PASSTHROUGH && (video_sync_method == VSYNC_CFR || video_sync_method == VSYNC_VSCFR || (video_sync_method == VSYNC_AUTO && !(oc->oformat->flags & AVFMT_VARIABLE_FPS)))){ av_log(oc, AV_LOG_WARNING, "Frame rate very high for a muxer not efficiently supporting it.\n" "Please consider specifying a lower framerate, a different muxer or -vsync 2\n"); } for (j = 0; j < ost->forced_kf_count; j++) ost->forced_kf_pts[j] = av_rescale_q(ost->forced_kf_pts[j], AV_TIME_BASE_Q, enc_ctx->time_base); enc_ctx->width = av_buffersink_get_w(ost->filter->filter); enc_ctx->height = av_buffersink_get_h(ost->filter->filter); enc_ctx->sample_aspect_ratio = ost->st->sample_aspect_ratio = ost->frame_aspect_ratio.num ? // overridden by the -aspect cli option av_mul_q(ost->frame_aspect_ratio, (AVRational){ enc_ctx->height, enc_ctx->width }) : av_buffersink_get_sample_aspect_ratio(ost->filter->filter); if (!strncmp(ost->enc->name, "libx264", 7) && enc_ctx->pix_fmt == AV_PIX_FMT_NONE && av_buffersink_get_format(ost->filter->filter) != AV_PIX_FMT_YUV420P) av_log(NULL, AV_LOG_WARNING, "No pixel format specified, %s for H.264 encoding chosen.\n" "Use -pix_fmt yuv420p for compatibility with outdated media players.\n", av_get_pix_fmt_name(av_buffersink_get_format(ost->filter->filter))); if (!strncmp(ost->enc->name, "mpeg2video", 10) && enc_ctx->pix_fmt == AV_PIX_FMT_NONE && av_buffersink_get_format(ost->filter->filter) != AV_PIX_FMT_YUV420P) av_log(NULL, AV_LOG_WARNING, "No pixel format specified, %s for MPEG-2 encoding chosen.\n" "Use -pix_fmt yuv420p for compatibility with outdated media players.\n", av_get_pix_fmt_name(av_buffersink_get_format(ost->filter->filter))); enc_ctx->pix_fmt = av_buffersink_get_format(ost->filter->filter); if (dec_ctx) enc_ctx->bits_per_raw_sample = FFMIN(dec_ctx->bits_per_raw_sample, av_pix_fmt_desc_get(enc_ctx->pix_fmt)->comp[0].depth); ost->st->avg_frame_rate = ost->frame_rate; if (!dec_ctx || enc_ctx->width != dec_ctx->width || enc_ctx->height != dec_ctx->height || enc_ctx->pix_fmt != dec_ctx->pix_fmt) { enc_ctx->bits_per_raw_sample = frame_bits_per_raw_sample; } if (ost->forced_keyframes) { if (!strncmp(ost->forced_keyframes, "expr:", 5)) { ret = av_expr_parse(&ost->forced_keyframes_pexpr, ost->forced_keyframes+5, forced_keyframes_const_names, NULL, NULL, NULL, NULL, 0, NULL); if (ret < 0) { av_log(NULL, AV_LOG_ERROR, "Invalid force_key_frames expression '%s'\n", ost->forced_keyframes+5); return ret; } ost->forced_keyframes_expr_const_values[FKF_N] = 0; ost->forced_keyframes_expr_const_values[FKF_N_FORCED] = 0; ost->forced_keyframes_expr_const_values[FKF_PREV_FORCED_N] = NAN; ost->forced_keyframes_expr_const_values[FKF_PREV_FORCED_T] = NAN; // Don't parse the 'forced_keyframes' in case of 'keep-source-keyframes', // parse it only for static kf timings } else if(strncmp(ost->forced_keyframes, "source", 6)) { parse_forced_key_frames(ost->forced_keyframes, ost, ost->enc_ctx); } } break; case AVMEDIA_TYPE_SUBTITLE: enc_ctx->time_base = (AVRational){1, 1000}; if (!enc_ctx->width) { enc_ctx->width = input_streams[ost->source_index]->st->codecpar->width; enc_ctx->height = input_streams[ost->source_index]->st->codecpar->height; } break; case AVMEDIA_TYPE_DATA: break; default: abort(); break; } return 0; }