[MPlayer-dev-eng] [PATCH] crash in vf_sab

[Alexander Strange]

sab mirrors coefficients past the edge of the picture instead of cropping:
   if     (iy<0)  iy=  -iy;
   if(iy>=h) iy= h-iy-1;

This produces -1,-2,-3... as it goes further past the end of an image,
which crashes. Attached patch changes it to h-1,h-2,h-3….
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