libavcodec/h264_direct.c:372: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:372:17: 
370.             } else {
371.                 a = mv[0];
372.                 b = mv[1];
                     ^
373.             }
374.             fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8, a, 4);
