libavcodec/vc1dec.c:3481: error: Uninitialized Value
  The value read from ysub[_] was never initialized.

libavcodec/vc1dec.c:3481:28: 
3479.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[0][0], src_h[0][1], ysub[0],
3480.                                                        src_h[1][0], alpha, width);
3481.                 } else if (ysub[1]) {
                                 ^
3482.                     v->vc1dsp.sprite_v_double_onescale(dst, src_h[1][0], src_h[1][1], ysub[1],
3483.                                                        src_h[0][0], (1<<16)-1-alpha, width);
