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

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

