Filter colorbalance
  Adjust the color balance.
    slice threading supported
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
colorbalance AVOptions:
  rs                <float>      ..FV.....T set red shadows (from -1 to 1) (default 0)
  gs                <float>      ..FV.....T set green shadows (from -1 to 1) (default 0)
  bs                <float>      ..FV.....T set blue shadows (from -1 to 1) (default 0)
  rm                <float>      ..FV.....T set red midtones (from -1 to 1) (default 0)
  gm                <float>      ..FV.....T set green midtones (from -1 to 1) (default 0)
  bm                <float>      ..FV.....T set blue midtones (from -1 to 1) (default 0)
  rh                <float>      ..FV.....T set red highlights (from -1 to 1) (default 0)
  gh                <float>      ..FV.....T set green highlights (from -1 to 1) (default 0)
  bh                <float>      ..FV.....T set blue highlights (from -1 to 1) (default 0)
  pl                <boolean>    ..FV.....T preserve lightness (default false)

This filter has support for timeline through the 'enable' option.

