libavcodec/vc1dec.c:1615: error: Uninitialized Value
  The value read from oppfield_predC[_] was never initialized.

libavcodec/vc1dec.c:1615:9: 
1613.         samefield_pred[1] = samefield_predC[1];
1614.         oppfield_pred[0]  = oppfield_predC[0];
1615.         oppfield_pred[1]  = oppfield_predC[1];
              ^
1616.     } else if (b_valid) {
1617.         samefield_pred[0] = samefield_predB[0];
