Dolby True HD + Dolby Atmos 7.1 not working on LG TV App

[ZumbaMaister]

Im new to this stuff so bare with me.. 

Ok, so i installed the Jellyfin app on my LG CX 4k OLED, but i cant get any 7.1 Dolby True HD to work via the LG app. I have a SONOS surround system connected via HDMI ARC. 

When i play any content, it gives me Dolby Multichannel PCM 5.1. 

Some off the Movie files have Subtitles. When i select any Subtitle it starts transcoding and the whole picture changes. (colors are off etc.) It says Subtitle/container CODEC not supported. (HEVC Main 10, MKV container). 
I used MKVToolNIX to remove all subtitles/audio files except the 7.1 TrueHD, but still only get Dolby Multichannel PCM 5.1. 

I have Dolby Atmos Tests on my Jellfyfin library. When i play them its same thing = Dolby Multichannel PCM 5.1. 

BUT
When i go into PLAYBACK setting in the JF TV app, and select "Enable TRUE HD" things change. 

When i try to play my Dolby Atmos tests it starts a voice promt - "You're listening to the Dolby Digital Companion Track, not the Dolby Atmos track. This disc is intended to demonstrate..." 
When i try playing movies with TRUE HD 7.1 DOLBY ATMOS, there is no sound at all. 

ONE Movie works, when "Enable true HD is off" it gives me  Dolby Multichannel PCM 5.1, when its on, it gives me DB Atmos. 

But the rest are PCM 5.1 when "TRUE HD OFF" or no audio at all when "TRUE HD ON". 

Passthrough is enabled on the tv and ive had no problems getting ATMOS to work from netflix etc, or from my windows pc via hdmi when using VLC.
After a bit of testing, any sound coming from the PC via hdmi to the tv shows up as ATMOS in the Sonos app.. so no clue whats what. 

So.. ONE movie works as intended, everything else looses audio when i enable "TRUE HD" in playback settings.

Is it just bad/wrong files or what am i missing? 

Movie files are 2160p.BluRay.REMUX.HEVC.TrueHD.7.1.Atmos 50-80Gb.

Any suggestions? 
Best regards

---EDIT---

I switched to PLEX... everything there works as intended. To i get TRUEHD dolby atmos? no, thats because apparently LG doesnt allow TrueHD passthrough from app, so i will need something like NVIDIA shield to get 7.1 TrueHD atmos.
But i do get Dolby Digital PLUS 7.1.

Sad to have to switch to plex to get the things working, i liked jellyfin overall.

[bitmap]

Ok, so i installed the Jellyfin app on my LG CX 4k OLED, but i cant get any 7.1 Dolby True HD to work via the LG app. I have a SONOS surround system connected via HDMI ARC.

Make sure that your Sonos supports TrueHD Atmos 7.1 via eARC. Not just Atmos -- TrueHD Atmos 7.1. It could honestly be as simple as incompatible cabling, but based on having no issues with Netflix, that's not likely.

Some off the Movie files have Subtitles. When i select any Subtitle it starts transcoding and the whole picture changes. (colors are off etc.) It says Subtitle/container CODEC not supported. (HEVC Main 10, MKV container).

Image-based subs are not supported by the webOS app. This makes sense -- the media was being tonemapped and you likely got AAC audio out of this.

Is it just bad/wrong files or what am i missing?

It's gotta be something in the LG settings. I just went into my C1 and there are a TON of audio settings, several of them for sound bars. Both TV Sound Mode Control and Sound Bar Mode Control seem possible, Select HDMI Input Audio Format maybe, I'd turn off LG Sound Sync, and try with both eARC on and off. Note that almost all of these settings refer to an **LG Sound System** so may not be compatible with your Sonos.

This doesn't appear to be a Jellyfin issue, but I'll reserve judgment. You'll probably want TrueHD enabled in JF to ensure the audio stream isn't transcoded. From there, trial and error.

[ZumbaMaister]

Thanks for reply.

My setup is:
TV: LG CX OLED 4K. (EARC enabled, passthrough on)
Sound: Sonos arc ultra, 2 era 300 as surround, and a sonos sub 4.


According to my research it should support TrueHD Atmos.
Problem is that LG doesnt allow TrueHD passthrough directly from an app. (it must come from something external, like Nvidia shield, blueray player etc.)

So, after a bit of tinkering with PLEX i found out that i cant get FullHD 7.1 DB Atmos, instead i get Dolby digital plus 7.1.
If i chose EAC3 5.1 soundfile, it shows me as Atmos in the sonos app. So question there is whats better? (5.1 Atmos or DD+ 7.1)

Regardless. In JF i actually managed to get DB Atmos from both of the audio options 5.1 and 7.1. But only on one film (avatar 2).
When trying same thing on topgun mavrick, it gave me DB Multichannel 5.1. (on TrueHD atmos 7.1 audio file).
When trying this on plex, i get DD+ 7.1. So here plex is a +.

Both on plex and jf, video start transcoding if i select a subtitle (psg).
JF does it both in Windows web, and Tv app.
Plex only on app. (i think?)

My brother has an Nvidia shield, and has tested both PLEX and JF, from what i understand he got both to work audiowise and without the subtitle transcoding.
Now for JF i used the Subtitle addon that can download directly and worked fine, issue then was sometimes subtitles didnt add up to the sound.

I have tried every combination under the moon when it comes to setting on the tv and on JF combined, sadly cant get it to work.
I even got KODI downloaded on the webOS and linked it to JF via the addons. Even got dolby vision prompted instead of HDR, but couldnt get anything more than stereo PCM out of that.

I cant find any settings u mention from your C1. I have colorcontrol downloaded, will check if i find any hidden setting via the service menu (used it to disable TPC and GSR).


It seems that my only option is to ether play my media via PC HDMI to get atmos (but worse hdr), or to get something like an Nvidia shield to be able to access TrueHD atmos 7.1. (Or just be happy with DD+ 7.1 for now)

Sadly it doesnt say in the sonos app if its 5.1 atmos or 7.1 atmos or if its TrueHD/DD+ specificly. Im getting the Dolby atmos logo in the app when playing TrueHD 7.1 from JF but no clue if its TrueHD or not. Im guessing not, since, again, LG doesnt do Truehd bypass from app.

[bitmap]

Now my brother has an Nvidia shield, and has tested both PLEX and JF, from what i understand he got both to work audiowise and without the subtitle transcoding.

Yeah, this is one of the only exceptions with regards to image-based subtitle formats. Kodi also supports image-based subtitles from what I've heard. Wish I had better news, but the subtitle issue will remain unless you opt for a different client that supports PGS without burn-in.

On the audio end...sounds like you're in a similar bind. I'd argue you're better off with 5.1 Atmos, but then you're not using your whole setup the way you want. Using an external client -- a Shield in particular -- would solve both problems.