libavcodec/vc1dec.c:2336: error: Uninitialized Value
  The value read from is_coded[_] was never initialized.

libavcodec/vc1dec.c:2336:21: 
2334.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
2335. 
2336.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant, (i&4)?v->codingset2:v->codingset);
                          ^
2337.                     if((i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;
2338.                     idct8x8_fn(s->dest[dst_idx] + off,
