libavcodec/vc1dec.c:3469: error: Uninitialized Value
  The value read from ysub[_] was never initialized.

libavcodec/vc1dec.c:3469:21: 
3467. 
3468.             if (!v->two_sprites) {
3469.                 if (ysub[0]) {
                          ^
3470.                     v->vc1dsp.sprite_v_single(dst, src_h[0][0], src_h[0][1], ysub[0], width);
3471.                 } else {
