libavcodec/h264_direct.c:364: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:364:17: 
362.             } else {
363.                 a = mv[0];
364.                 b = mv[1];
                     ^
365.             }
366.             fill_rectangle(&h->mv_cache[0][scan8[i8 * 4]], 2, 2, 8, a, 4);
