libavcodec/rv40.c:489: error: Uninitialized Value
  The value read from mbtype[_] was never initialized.

libavcodec/rv40.c:489:17: 
487.             }else{
488.                 mvmasks[i] = 0;
489.                 mbtype [i] = mbtype[0];
                     ^
490.                 cbp    [i] = 0;
491.                 uvcbp[i][0] = uvcbp[i][1] = 0;
