libavcodec/vc1dec.c:3445: error: Uninitialized Value
  The value read from xadv[_] was never initialized.

libavcodec/vc1dec.c:3445:47: 
3443.                     iline  = s->last_picture.f.linesize[plane];
3444.                 }
3445.                 if (!(xoff[sprite]&0xFFFF) && xadv[sprite] == 1<<16) {
                                                    ^
3446.                         src_h[sprite][0] = iplane+(xoff[sprite]>>16)+ yline   *iline;
3447.                     if (ysub[sprite])
