libavcodec/vc1dec.c:1610: error: Uninitialized Value
  The value read from oppfield_predA[_] was never initialized.

libavcodec/vc1dec.c:1610:9: 
1608.         samefield_pred[1] = samefield_predA[1];
1609.         oppfield_pred[0]  = oppfield_predA[0];
1610.         oppfield_pred[1]  = oppfield_predA[1];
              ^
1611.     } else if (c_valid) {
1612.         samefield_pred[0] = samefield_predC[0];
