Filter deflicker
  Remove temporal frame luminance variations.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
deflicker AVOptions:
  size              <int>        ..FV..... set how many frames to use (from 2 to 129) (default 5)
  s                 <int>        ..FV..... set how many frames to use (from 2 to 129) (default 5)
  mode              <int>        ..FV..... set how to smooth luminance (from 0 to 6) (default am)
     am                           ..FV..... arithmetic mean
     gm                           ..FV..... geometric mean
     hm                           ..FV..... harmonic mean
     qm                           ..FV..... quadratic mean
     cm                           ..FV..... cubic mean
     pm                           ..FV..... power mean
     median                       ..FV..... median
  m                 <int>        ..FV..... set how to smooth luminance (from 0 to 6) (default am)
     am                           ..FV..... arithmetic mean
     gm                           ..FV..... geometric mean
     hm                           ..FV..... harmonic mean
     qm                           ..FV..... quadratic mean
     cm                           ..FV..... cubic mean
     pm                           ..FV..... power mean
     median                       ..FV..... median
  bypass            <boolean>    ..FV..... leave frames unchanged (default false)


