static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    c->chapter_track = avio_rb32(pb);
    return 0;
}
static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    c->chapter_track = avio_rb32(pb);
    return 0;
}