LG Oled C8 Plex App - Audio Formats

Plex Players Smart TVs
1

I have an LG Oled55C8 with webos 4.0 which is connected to and Av receiver Denon X-4500H by Hdmi Arc.
I start playing around with Plex for the first time and it did work really well.
I have created servers on both my laptops and everything played like a charp with on the Plex app of the TV.

My only issue is that audio sources such as TrueHD 7.1, TrueHD 7.1 Dolby Atmos, etc are down converted to DD+.
On the TV Plex App settings only shows the audio formats from the photo below.

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Plex can or cannot play 7.1 dolby atmos sources and why is not working on my TV?

Aplogies inadvance for the noob questions.

Thanks

2

See How to use Plex app on Sony TV
for an explanation of the limits of an ARC connection.

3

tl;dr you can’t pass HD audio over an HDMI ARC link.

Have a read through Plex, 4k, transcoding, and you - aka the rules of 4k - a FAQ for much more information.

4

Your model LG OLED is a 2018 model and does not support eARC. Your Dennon does support, so no pass thru of HD

eARC was introduced in 2019 models so C9 may well have done so.

5

Plex will transcode TrueHD and TrueHD + Atmos due to the limitations of HDMI-ARC.

dts-HD MA will direct play. However, only the core dts 5.1 is passed to your receiver. The “-HD MA” part is dropped due to the limitations of HDMI-ARC.

The Atmos version used by Netflix, Amazon, etc is Dolby Digital Plus + Atmos. That can be passed over HDMI-ARC. If you use the TV’s Netflix & Amazon apps and play an appropriate movie/show, your receiver will show it is receiving Atmos audio.

6

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