static int v210_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret;

    ret = av_get_packet(s->pb, pkt, s->packet_size);
    pkt->pts = pkt->dts = pkt->pos / s->packet_size;

    pkt->stream_index = 0;
    if (ret < 0)
        return ret;
    return 0;
}