Muxer nut [NUT]:
    Common extensions: nut.
    Mime type: video/x-nut.
    Default video codec: mpeg4.
    Default audio codec: vorbis.
nutenc AVOptions:
  -syncpoints        <flags>      E........ NUT syncpoint behaviour (default 0)
     default                      E........ 
     none                         E........ Disable syncpoints, low overhead and unseekable
     timestamped                  E........ Extend syncpoints with a wallclock timestamp
  -write_index       <boolean>    E........ Write index (default true)


