memset(&h->mb, 0, sizeof(h->mb));
memset(&h->mb_luma_dc, 0, sizeof(h->mb_luma_dc));
memset(&h->mb_padding, 0, sizeof(h->mb_padding));
memset(&h->mb, 0, sizeof(h->mb));
memset(&h->mb_luma_dc, 0, sizeof(h->mb_luma_dc));
memset(&h->mb_padding, 0, sizeof(h->mb_padding));