[FFmpeg-user] Flip in sws_scale

[erikjn]

If the planes in the image are unequal size (e.g. YUV420) you need to adapt
the height.
There may be better ways to do it, but this works for me:

void FlipFrameJ420(AVFrame* pFrame) {
   for (int i = 0; i < 4; i++) {
      if (i) {
          pFrame->data[i] += pFrame->linesize[i] * ((pFrame->height >>
1)-1);
      }
      else {
          pFrame->data[i] += pFrame->linesize[i] * (pFrame->height-1);
      }
      pFrame->linesize[i] = -pFrame->linesize[i];
   }
}



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