AV_WL16(pkt->data, c->flags);
if (c->gmcsize)
memcpy(pkt->data + 2, c->gmc, c->gmcsize);
if (avio_read(s->pb, pkt->data + 2 + c->gmcsize, size) != size) {
AV_WL16(pkt->data, c->flags);
if (c->gmcsize)
memcpy(pkt->data + 2, c->gmc, c->gmcsize);
if (avio_read(s->pb, pkt->data + 2 + c->gmcsize, size) != size) {