static int mov_write_moof_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks,
                              int64_t mdat_size)
{
    AVIOContext *avio_buf;
    int ret, moof_size;

    if ((ret = ffio_open_null_buf(&avio_buf)) < 0)
        return ret;
    mov_write_moof_tag_internal(avio_buf, mov, tracks, 0);
    moof_size = ffio_close_null_buf(avio_buf);

    if (mov->flags & FF_MOV_FLAG_DASH && !(mov->flags & FF_MOV_FLAG_GLOBAL_SIDX))
        mov_write_sidx_tags(pb, mov, tracks, moof_size + 8 + mdat_size);

    if ((ret = mov_add_tfra_entries(pb, mov, tracks, moof_size + 8 + mdat_size)) < 0)
        return ret;

    return mov_write_moof_tag_internal(pb, mov, tracks, moof_size);
}
Unknown