Filter normalize
  Normalize RGB video.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
normalize AVOptions:
  blackpt           <color>      ..FV..... output color to which darkest input color is mapped (default "black")
  whitept           <color>      ..FV..... output color to which brightest input color is mapped (default "white")
  smoothing         <int>        ..FV..... amount of temporal smoothing of the input range, to reduce flicker (from 0 to 2.68435e+008) (default 0)
  independence      <float>      ..FV..... proportion of independent to linked channel normalization (from 0 to 1) (default 1)
  strength          <float>      ..FV..... strength of filter, from no effect to full normalization (from 0 to 1) (default 1)

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

