How to prevent video transcoding as well on audio-only transcode?

I cant get Jellyfin to stop transcoding direct playable files, when i just want an audio change DTS->AC3 or 7.1->5.1 ?

If i try prevent this and disallow just video transcoding in the user settings, the files wont even play anymore with a "format not supported" error.

The video always gets transcoded as well? I tried 10.8-beta2 and 10.8-unstable.

I just want a way to transcode DTS, AAC 5.1, Opus 5.1 to normal AC3 on the server, without touching the video.