I do have my Jellyfin server added as a source, but it is not transcoding. Videos played through VLC appear to be direct streaming, and the only transcoding options I see in settings in the app are for BubbleUPNP.
As I understand it Yatse has no built-in player? I know for the Android Jellyfin app, transcoding will not work when using an external player (ie VLC); only the built-in web player will transcode.
Perhaps that is the case here?
Edit: I’ll run some tests to make sure that there is indeed a problem, and I’m not just an idiot.
Edit 2: Just played a 4K file over Cellular Data (no WiFi) - Settings are set at 6 Mbps over Cellular (and just to be safe, WiFi and Chromecast too) - The video got up to 100 Mbps in spots (as shown in the Video Information in VLC while it was playing), so it’s definitely not transcoding down the quality.