libavcodec/vc1_block.c:1528: error: Uninitialized Value
  The value read from is_coded[_] was never initialized.

libavcodec/vc1_block.c:1528:21: 
1526.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
1527. 
1528.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,
                          ^
1529.                                            (i & 4) ? v->codingset2 : v->codingset);
1530.                     if ((i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
