libavcodec/h264_mb_template.c:302: error: Uninitialized Value
  The value read from dest[_] was never initialized.

libavcodec/h264_mb_template.c:302:17: 
300.         if (mb_y & 1) // FIXME move out of this function?
301.             for (p = 0; p < 3; p++)
302.                 dest[p] -= sl->linesize * 15;
                     ^
303.         if (FRAME_MBAFF(h)) {
304.             int list;
