libavcodec/h264.c:1012: error: Uninitialized Value
  The value read from ref[_] was never initialized.

libavcodec/h264.c:1012:12: 
1010.         }
1011. 
1012.         if(ref[0] < 0 && ref[1] < 0){
                 ^
1013.             ref[0] = ref[1] = 0;
1014.             mv[0][0] = mv[0][1] =
