Filter lenscorrection
  Rectify the image by correcting for lens distortion.
    slice threading supported
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
lenscorrection AVOptions:
  cx                <double>     ..FV.....T. set relative center x (from 0 to 1) (default 0.5)
  cy                <double>     ..FV.....T. set relative center y (from 0 to 1) (default 0.5)
  k1                <double>     ..FV.....T. set quadratic distortion factor (from -1 to 1) (default 0)
  k2                <double>     ..FV.....T. set double quadratic distortion factor (from -1 to 1) (default 0)
  i                 <int>        ..FV.....T. set interpolation type (from 0 to 64) (default nearest)
     nearest         0            ..FV.....T. nearest neighbour
     bilinear        1            ..FV.....T. bilinear
  fc                <color>      ..FV.....T. set the color of the unmapped pixels (default "black@0")

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

