Filter random
  Return random frames.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
random AVOptions:
  frames            <int>        ..FV..... set number of frames in cache (from 2 to 512) (default 30)
  seed              <int64>      ..FV..... set the seed (from -1 to UINT32_MAX) (default -1)


