Unwanted transcoding of Dolby Vision content with Android TV App

[TimoDeus]

Hi!

I'm a happy user of Jellyfin 10.10.7 with Kodi as client.
Jellyfin server is running in a container on my NAS. Kodi client is running on a Homatics Box R connected via capable Denon AVR and eARC to LG G4 OLED
Everything direct plays, no transcoding at all (which my NAS couldn't handle). Dolby Vision, TrueHD audio, whatever I want, it just works.

Now while this all sounds fine, I don't really like the "workaround" with Kodi. I'd much more appreciate a simple solution of just using the Jellyfin App without any fiddling around. And here the problems start...

I know that 10.10.7 has problems with HDR metadata, Dolby Vision, HDR10+ and HDR10 fallbacks etc.
Should be fixed by this: https://github.com/jellyfin/jellyfin/pull/13277

So I had high hopes for 10.11 where this fix is included. Today I tried it out with a parallel install of 10.11.0 RC8 (current unstable version).
After starting up the container I added a small subset of my library for testing. I didn't change any settings at all.

Using Jellyfin Android TV App version 0.18.11 and a random Dolby Vision video:
Playback fails with an error message: "Player error encountered. Will re-try...". After a few seconds video starts playing, but transcoding to HDR instead of direct playing DoVi. My poor NAS is at 100% CPU usage, playback stutters.

Now I'm not sure where the problem is.

TV: Unlikely, it works flawlessly with Kodi
Android TV App: Is it already optimized for 10.11.0?
Jellyfin Server: Do I have to set up anything? For example, Kodi has the setting where I tell it to never consider HDR10+

Logfile of playback: https://pastebin.com/jhhyiFnd
(also attached to this thread)

[theguymadmax]

You may have better luck with the .19.0 beta. https://github.com/jellyfin/jellyfin-androidtv/releases

[TimoDeus]

nice, lots of DoVi/HDR and DirectPlay fixes. I'll give it a try!