7h0m4s , 10 months ago

This is indeed the correct answer. It is under the transcoding options. Your server will essentially need to re-transcode the video on the fly to add in subtitles. Which requires a not insignificant amount of processing power.

I ran into this issue while running jellyfin on a raspberry pi.

So long as your server has hardware acceleration turned on. To allow jellyfin to use your GPU for transcoding. You should be fine.