libavcodec/vc1dec.c:1002: error: Uninitialized Value
  The value read from uvmx_field[_] was never initialized.

libavcodec/vc1dec.c:1002:9: 
1000.             use_ic = v->last_use_ic;
1001.         }
1002.         uvmx_field[i] = (uvmx_field[i] & 3) << 1;
              ^
1003.         uvmy_field[i] = (uvmy_field[i] & 3) << 1;
1004. 
