Plex Lg C9

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  1. Lg C9 Atmos
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Server Version#: Version 1.20.0.3133
Player Version#: 5.1.0 / 4.8.0 (Early Access LG Client)

Lg C9 Atmos

I was hoping someone could help me with an issue I have been testing today.

I have a collection of HEVC 4K HDR files with TRUEHD7.1 tracks.

  • Server Version#: 1.16.3.1402 Player Version#: Plex for LG 4.1.1, WebOS: 4.6.0 TV: LG OLED 65C9PTA Soundbar: LG SL9YG + rear Kit (4.1.2 + rear kit) ATMOS,DTS:X Problem desctiption: When trying to play TrueHD 7.1 audio the plex app transcodes instead of direct stream. The same is not a problem.
  • Aug 14, 2019 Server Version#: 1.16.3.1402 Player Version#: Plex for LG 4.1.1, WebOS: 4.6.0 TV: LG OLED 65C9PTA Soundbar: LG SL9YG + rear Kit (4.1.2 + rear kit) ATMOS,DTS:X Problem desctiption: When trying to play TrueHD 7.1 audio the plex app transcodes instead of direct stream. The same is not a problem.

Although some files do work in DV, 90% don't seem to work on LG C9's Plex App. Plex wont detect the DV and will transcode the file and play in SDR instead with funky colors. On LG CX Plex same files work fine. Casting plex to my LG C9 OLED tv with airplay doesn't work. All other apps work, and the built-in plex app on the tv itself works fine, but when casting plex from a mobile device using airplay, the screen just becomes black without anything being displayed.

Plex

I can use Xplay and the files direct play and work fine, I can use a firestick and the files also play fine (not checked if also direct playing)

The LG plex app reports no ability to play truehd which is technically true as it can’t pass through full HD audio so the server then transcodes the audio from 7.1 truehd to 7.1 eac.

Lg

Server spec:
Intel® Core™ i7-3770 CPU @ 3.40GHz
16GB DDR3 RAM
2x 3TB RAID 0
Ubuntu 20.04.1 LTS (GNU/Linux 5.4.0-42-generic x86_64)
Plex 1.20.0.3133

The files are not corrupted, it seems to be some sort of issue with the transcode it looks exactly like the post here:

@ourcontact said: I have the changes listed above for the HTML TV App.xml profile and it did make some improvements. I have come across another problem video and would like to understand how I can resolve, not just someone fix for me - but that would be nice too… So this one (Life of Pi 2160p 4K HDR10 HEVC BT2020 DTSHD) again plays perfectly in the Video DLNA app with DirectPlay. When I use the LG app I get DirectStream and it ends up with occasional video, but mostly a rainbow of bleeding …

I have tried removing the intel drivers as I thought this looked like a similar problem but it did not help:

Server Version#: 1.18.2.2058 (QNAP NAS) Player Version#: 7.25.1.14216 (Android Mobile) Since version 1.18.1.1973 hardware transcondig fails regardless of the client device (Android TV, Android Phone, Chromcast Ultra, Windows 10) used. [PLEX_1] As a workarround I can disable the hardware transcondig on the PLEX Media Server. But this results in a very high CPU load on my QNAP 453Be NAS (Intel J3455 HD Graphics 500) Changing the transcoder settings doen’t make any diffrence. So for the momen…

Plex Lg C9 Plus

I do have another server running Ubuntu 18.04 I could test the same files with but thought I would post here to see if it is a known issue?

Plex Lg App

What is very strange is my version of Ready Player One plays perfectly with no glitches even when transcoding the audio track. But a version of Thor Ragnarok and The Fifth Element show immediate glitching unless I switch to a 5.1 AC3 track which then direct plays.