libavcodec/h264_direct.c:325: error: Uninitialized Value
  The value read from mv[_] was never initialized.

libavcodec/h264_direct.c:325:17: 
323.                     b= mv[1];
324.             }else{
325.                 a= mv[0];
                     ^
326.                 b= mv[1];
327.             }
