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)


