libavcodec/vc1dec.c:1587: error: Uninitialized Value
  The value read from oppfield_predB[_] was never initialized.

libavcodec/vc1dec.c:1587:9: 
1585.         samefield_pred[1] = samefield_predB[1];
1586.         oppfield_pred[0] = oppfield_predB[0];
1587.         oppfield_pred[1] = oppfield_predB[1];
              ^
1588.     } else {
1589.         samefield_pred[0] = samefield_pred[1] = 0;
