pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
if (ret < size) {
pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
if (ret < size) {