libavcodec/h264_direct.c:363: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:363:17: 
361.                 n++;
362.             } else {
363.                 a = mv[0];
                     ^
364.                 b = mv[1];
365.             }
