libavcodec/vc1dec.c:3493: error: Uninitialized Value
  The value read from yoff[_] was never initialized.

libavcodec/vc1dec.c:3493:17: 
3491.             for (i = 0; i < 2; i++) {
3492.                 xoff[i] >>= 1;
3493.                 yoff[i] >>= 1;
                      ^
3494.             }
3495.         }
