libavcodec/h264_direct.c:360: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:360:21: 
358.                     a = mv[0];
359.                 if (ref[1] > 0)
360.                     b = mv[1];
                         ^
361.                 n++;
362.             } else {
