Filter fieldhint
  Field matching using hints.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
fieldhint AVOptions:
  hint              <string>     ..FV..... set hint file
  mode              <int>        ..FV..... set hint mode (from 0 to 1) (default absolute)
     absolute        0            ..FV.....
     relative        1            ..FV.....


