Hey fellow saltdogs! :D
I have a jellyfin server running on an old laptop. Now I have the jellyfin Android app and would want to play content with subtitles (anime weeabooo), Cast to my Chromecast. I was using VLC player as an external player on Android but casting with subtitles is not supported. Max Player had a lot of adds I have heard (?).
Anyone watching their content with subtitles via Chromecast? What player are you using?
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.