Filter setsar
  Set the pixel sample aspect ratio.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
setsar AVOptions:
  sar               <string>     ..FV.... set sample (pixel) aspect ratio (default "0")
  ratio             <string>     ..FV.... set sample (pixel) aspect ratio (default "0")
  r                 <string>     ..FV.... set sample (pixel) aspect ratio (default "0")
  sar_den           <float>      ..FV.... (from 0 to FLT_MAX) (default 0)
  max               <int>        ..FV.... set max value for nominator or denominator in the ratio (from 1 to INT_MAX) (default 100)


