Changing tags corrupts MP4 videofile

[onionware-github]

When I try to change the tags of a downloaded video from TikTok with yt-dlp, it corrupts the file. Curiously, the problem occurs with TikTok videos. When I change the tags with EasyTAG it works. So I think the problem is with taglibsharp. If I manually reencode the video (h264) after downloading it, I don't get any problems changing the tags with TagLibSharp.

Steps to reproduce:

1. Download a video from TikTok with yt-dlp or OnionMedia.
2. Change tags like title or description with TagLibSharp.
3. Add the video to the convertpage of OnionMedia => Failed
   ---------- OR ----------
   Open the video with ffmpeg (ffmpeg -i [path]) produces this output:

[mov,mp4,m4a,3gp,3g2,mj2 @ 000001715ccd0600] The 'keys' atom with the invalid key count: 1819505664
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001715ccd0600] error reading header
C:\Users\Jaden\Downloads\bahnvideo.mp4: Invalid data found when processing input

Summary: With EasyTAG I can edit the file instant without any problems, with TagLibSharp I have to recode it again to H264 first, otherwise it will be corrupted. As far as I know, this only affects downloaded TikTok videos so far, this problem do not exist with YouTube downloads.