libavcodec/vc1.c:3342: error: Uninitialized Value
  The value read from is_coded[_] was never initialized.

libavcodec/vc1.c:3342:27: 
3340.                     }
3341.                     block_cbp |= 0xF << (i << 2);
3342.                 } else if(is_coded[i]) {
                                ^
3343.                     int left_cbp = 0, top_cbp = 0, filter = 0;
3344.                     if(v->s.loop_filter && s->mb_x && s->mb_x != (s->mb_width - 1) && s->mb_y && s->mb_y != (s->mb_height - 1)){
