Filter mestimate
  Generate motion vectors.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
mestimate AVOptions:
  method            <int>        ..FV.... motion estimation method (from 1 to 9) (default esa)
     esa                          ..FV.... exhaustive search
     tss                          ..FV.... three step search
     tdls                         ..FV.... two dimensional logarithmic search
     ntss                         ..FV.... new three step search
     fss                          ..FV.... four step search
     ds                           ..FV.... diamond search
     hexbs                        ..FV.... hexagon-based search
     epzs                         ..FV.... enhanced predictive zonal search
     umh                          ..FV.... uneven multi-hexagon search
  mb_size           <int>        ..FV.... macroblock size (from 8 to INT_MAX) (default 16)
  search_param      <int>        ..FV.... search parameter (from 4 to INT_MAX) (default 7)


