static int mov_write_iods_tag(AVIOContext *pb, MOVMuxContext *mov)
{
    int i, has_audio = 0, has_video = 0;
    int64_t pos = avio_tell(pb);
    int audio_profile = mov->iods_audio_profile;
    int video_profile = mov->iods_video_profile;
    for (i = 0; i < mov->nb_streams; i++) {
        if (mov->tracks[i].entry > 0 || mov->flags & FF_MOV_FLAG_EMPTY_MOOV) {
            has_audio |= mov->tracks[i].par->codec_type == AVMEDIA_TYPE_AUDIO;
            has_video |= mov->tracks[i].par->codec_type == AVMEDIA_TYPE_VIDEO;
        }
    }
    if (audio_profile < 0)
        audio_profile = 0xFF - has_audio;
    if (video_profile < 0)
        video_profile = 0xFF - has_video;
    avio_wb32(pb, 0x0); /* size */
    ffio_wfourcc(pb, "iods");
    avio_wb32(pb, 0);    /* version & flags */
    put_descr(pb, 0x10, 7);
    avio_wb16(pb, 0x004f);
    avio_w8(pb, 0xff);
    avio_w8(pb, 0xff);
    avio_w8(pb, audio_profile);
    avio_w8(pb, video_profile);
    avio_w8(pb, 0xff);
    return update_size(pb, pos);
}
Unknown