static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if (atom.size < 16)
        return 0;

    /* skip version and flags */
    avio_skip(pb, 4);

    ff_mov_read_chan(c->fc, pb, st, atom.size - 4);

    return 0;
}