libavcodec/vc1dec.c:3475: error: Uninitialized Value
  The value read from ysub[_] was never initialized.

libavcodec/vc1dec.c:3475:21: 
3473.                 }
3474.             } else {
3475.                 if (ysub[0] && ysub[1]) {
                          ^
3476.                     v->vc1dsp.sprite_v_double_twoscale(dst, src_h[0][0], src_h[0][1], ysub[0],
3477.                                                        src_h[1][0], src_h[1][1], ysub[1], alpha, width);
