Filter tonemap
  Conversion to/from different dynamic ranges.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
tonemap AVOptions:
  tonemap           <int>        ..FV.... tonemap algorithm selection (from 0 to 6) (default none)
     none                         ..FV....
     linear                       ..FV....
     gamma                        ..FV....
     clip                         ..FV....
     reinhard                     ..FV....
     hable                        ..FV....
     mobius                       ..FV....
  param             <double>     ..FV.... tonemap parameter (from DBL_MIN to DBL_MAX) (default nan)
  desat             <double>     ..FV.... desaturation strength (from 0 to DBL_MAX) (default 2)
  peak              <double>     ..FV.... signal peak override (from 0 to DBL_MAX) (default 0)


