code: def input(filename, **kwargs):
      
      kwargs['filename'] = filename
      fmt = kwargs.pop('f', None)
      if fmt:
          if 'format' in kwargs:
              raise ValueError("Can't specify both `format` and `f` kwargs")
          kwargs['format'] = fmt
      return InputNode(input.__name__, kwargs=kwargs).stream()
docs: Input file URL (ffmpeg ``-i`` option)
  
      Any supplied kwargs are passed to ffmpeg verbatim (e.g. ``t=20``,
      ``f='mp4'``, ``acodec='pcm'``, etc.).
  
      To tell ffmpeg to read from stdin, use ``pipe:`` as the filename.
  
      Official documentation: `Main options <https://ffmpeg.org/ffmpeg.html#Main-options>`__