static int mov_write_stbl_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext *mov, MOVTrack *track)
{
    int64_t pos = avio_tell(pb);
    int ret;

    avio_wb32(pb, 0); /* size */
    ffio_wfourcc(pb, "stbl");
    mov_write_stsd_tag(s, pb, mov, track);
    mov_write_stts_tag(pb, track);
    if ((track->par->codec_type == AVMEDIA_TYPE_VIDEO ||
         track->par->codec_tag == MKTAG('r','t','p',' ')) &&
        track->has_keyframes && track->has_keyframes < track->entry)
        mov_write_stss_tag(pb, track, MOV_SYNC_SAMPLE);
    if (track->par->codec_type == AVMEDIA_TYPE_VIDEO && track->has_disposable)
        mov_write_sdtp_tag(pb, track);
    if (track->mode == MODE_MOV && track->flags & MOV_TRACK_STPS)
        mov_write_stss_tag(pb, track, MOV_PARTIAL_SYNC_SAMPLE);
    if (track->par->codec_type == AVMEDIA_TYPE_VIDEO &&
        track->flags & MOV_TRACK_CTTS && track->entry) {

        if ((ret = mov_write_ctts_tag(s, pb, track)) < 0)
            return ret;
    }
    mov_write_stsc_tag(pb, track);
    mov_write_stsz_tag(pb, track);
    mov_write_stco_tag(pb, track);
    if (track->cenc.aes_ctr) {
        ff_mov_cenc_write_stbl_atoms(&track->cenc, pb);
    }
    if (track->par->codec_id == AV_CODEC_ID_OPUS || track->par->codec_id == AV_CODEC_ID_AAC) {
        mov_preroll_write_stbl_atoms(pb, track);
    }
    return update_size(pb, pos);
}

The product divides a value by zero.