check the transcoding section on the server and on the phone

I wish I could see the comments on this post I made. Not sure what's wrong with lemmy, it's been like this since I made the post two days ago. When I click the post I just see my original post, no comments. Same result if I open the thread from the Selfhosted channel. If I view my own profile history and click the context button, the site just loads forever and never shows anything.

Almost always this is a player issue as mentioned. I've had similar issues with some files where audio just doesn't work on one player but works fine for another. Same with subtitles. Set to an external player like VLC and see if that fixes it. (For what it's worth, I mostly access Jellyfin from my Chromecast and I have it set to prompt me for a player each time I start watching something, one of them always works but for my files it isn't consistent which)

I'm not sure of the cause, but this is an issue with the Web Player on the Jellyfin app. You can fix it by going to Settings -> Client Settings -> Video Player Type and selecting Integrated Player or External Player.