Filter shear
  Shear transform the input image.
    slice threading supported
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
shear AVOptions:
  shx               <float>      ..FV.....T. set x shear factor (from -2 to 2) (default 0)
  shy               <float>      ..FV.....T. set y shear factor (from -2 to 2) (default 0)
  fillcolor         <string>     ..FV.....T. set background fill color (default "black")
  c                 <string>     ..FV.....T. set background fill color (default "black")
  interp            <int>        ..FV.....T. set interpolation (from 0 to 1) (default bilinear)
     nearest         0            ..FV.....T. nearest neighbour
     bilinear        1            ..FV.....T. bilinear

This filter has support for timeline through the 'enable' option.

