Muxer avi [AVI (Audio Video Interleaved)]:
    Common extensions: avi.
    Mime type: video/x-msvideo.
    Default video codec: mpeg4.
    Default audio codec: mp3.
AVI muxer AVOptions:
  -reserve_index_space <int>        E........ reserve space (in bytes) at the beginning of the file for each stream index (from 0 to INT_MAX) (default 0)
  -write_channel_mask <boolean>    E........ write channel mask into wave format header (default true)


