libavcodec/h264_direct.c:303: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:303:21: 
301.                 }else{
302.                     a= mv[0];
303.                     b= mv[1];
                         ^
304.                 }
305.                 fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, a, 4);
