libavcodec/h264_refs.c:519: error: Uninitialized Value
  The value read from i was never initialized.

libavcodec/h264_refs.c:519:9: 
517.                (mmco_index != h->mmco_index ||
518.                 (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) {
519.         av_log(h->s.avctx, AV_LOG_ERROR,
             ^
520.                "Inconsistent MMCO state between slices [%d, %d, %d]\n",
521.                mmco_index, h->mmco_index, i);
