Filter deshake
  Stabilize shaky video.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
deshake AVOptions:
  x                 <int>        ..FV..... set x for the rectangular search area (from -1 to INT_MAX) (default -1)
  y                 <int>        ..FV..... set y for the rectangular search area (from -1 to INT_MAX) (default -1)
  w                 <int>        ..FV..... set width for the rectangular search area (from -1 to INT_MAX) (default -1)
  h                 <int>        ..FV..... set height for the rectangular search area (from -1 to INT_MAX) (default -1)
  rx                <int>        ..FV..... set x for the rectangular search area (from 0 to 64) (default 16)
  ry                <int>        ..FV..... set y for the rectangular search area (from 0 to 64) (default 16)
  edge              <int>        ..FV..... set edge mode (from 0 to 3) (default mirror)
     blank           0            ..FV..... fill zeroes at blank locations
     original        1            ..FV..... original image at blank locations
     clamp           2            ..FV..... extruded edge value at blank locations
     mirror          3            ..FV..... mirrored edge at blank locations
  blocksize         <int>        ..FV..... set motion search blocksize (from 4 to 128) (default 8)
  contrast          <int>        ..FV..... set contrast threshold for blocks (from 1 to 255) (default 125)
  search            <int>        ..FV..... set search strategy (from 0 to 1) (default exhaustive)
     exhaustive      0            ..FV..... exhaustive search
     less            1            ..FV..... less exhaustive search
  filename          <string>     ..FV..... set motion search detailed log file name
  opencl            <boolean>    ..FV..... ignored (default false)


