libavcodec/vc1.c:3155: error: Uninitialized Value
  The value read from is_intra[_] was never initialized.

libavcodec/vc1.c:3155:17: 
3153.                 }
3154.                 if(i == 4) vc1_mc_4mv_chroma(v);
3155.                 v->mb_type[0][s->block_index[i]] = is_intra[i];
                      ^
3156.                 if(!coded_inter) coded_inter = !is_intra[i] & is_coded[i];
3157.             }
