Muxer gif [GIF Animation]:
    Common extensions: gif.
    Mime type: image/gif.
    Default video codec: gif.
GIF muxer AVOptions:
  -loop              <int>        E..... Number of times to loop the output. (from 0 to 65535)
  -final_delay       <int>        E..... Force delay (in ms) after the last frame (from -1 to 65535)

