libavcodec/h264_direct.c:302: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:302:21: 
300.                     n++;
301.                 }else{
302.                     a= mv[0];
                         ^
303.                     b= mv[1];
304.                 }
