libavcodec/vc1dec.c:3732: error: Uninitialized Value
  The value read from is_intra[_] was never initialized.

libavcodec/vc1dec.c:3732:25: 
3730.                 int intrapred = 0;
3731.                 for (i = 0; i < 6; i++)
3732.                     if (is_intra[i]) {
                              ^
3733.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])
3734.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {
