libavcodec/h264_direct.c:326: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:326:17: 
324.             }else{
325.                 a= mv[0];
326.                 b= mv[1];
                     ^
327.             }
328.             fill_rectangle(&h->mv_cache[0][scan8[0]], 4, 4, 8, a, 4);
