libavcodec/vc1.c:3192: error: Uninitialized Value
  The value read from is_coded[_] was never initialized.

libavcodec/vc1.c:3192:21: 
3190.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
3191. 
3192.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);
                          ^
3193.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;
3194.                     s->dsp.vc1_inv_trans_8x8(s->block[i]);
