No audio from 4k HEVC Main 10 HDR playback (not DTS issue)

Plex Players Smart TVs
1

Server Version#: 1.21.0.3711
Player Version#: LG WebOS App (Client Version 5.5.1, Platform Version 5.2.0)

Hi,

Really hoping you folk can help me! I’ve been using Plex with my LG C8 OLED for a while now with no problems. I’ve recently got a second TV for another room and that’s where I’m having issues. It’s a cheaper LG 50UN80006LC model.

The problem occurs when playing back 4k HEVC Main 10 HDR files. I’ve ripped my files with 3 audio tracks: TrueHD 7.1, DTS-HD MA 7.1 and AC3 5.1. I fully understand that the LG TV’s don’t support DTS so what I do on my C8 OLED is to switch to the AC3 audio track and that’s fine (better audio tracks ripped for future-proofing so I don’t have to redo it later if I ever get better surround system). However, this isn’t working on my newer secondary TV.

When selecting the AC3 5.1 track on this TV the video plays back fine but there is no audio at all. I can see in the server dashboard that it’s using Direct Play for both video and audio. The TV says it supports AC3 audio but it doesn’t seem to when it’s in an HEVC container.

Lower definition content works fine.

Please, someone help! :slight_smile:

3

AAC5.1 plays fine maybe a trans coding issue .

Screen Shot 2020-12-09 at 3.02.27 am
Screen Shot 2020-12-09 at 3.02.27 am775×645 75.5 KB

4

HEVC is not a container format. It’s just a video encoding format. If you can see the video, then it works just fine.
The real issue, IMHO, is that in “direct play”, Plex will just send the file content directly, and let LG player to figure it out. Your old LG TV player cannot understand TrueHD, yet it sees the track as AC3 so it tries to handle it that way, so error occurs and you get no sound.

So maybe you can uncheck the “direct play”, and tell Plex the TV cannot handle “TrueHD” and “DTS”. This way perhaps “direct stream” will work.

5

Well, I finally see why there is no audio, because my Plex has the same issue and I figured it out.

Supposed there are 3 audio tracks: 1. TrueHD , 2. DTS-HD 3. AC3

To the Plex player, DTS-HD is not playable, so it doesn’t count. Therefore, to the mind of Plex player, there are only 2 tracks: 1. TrueHD, 2. AC3.

So if you want to play AC3, you should choose the 2nd audio track, which is DTS-HD, but it will be fine, you will hear the sound of AC3 instead.

6

I’m told there will be a client update next year which will tackle this issue.

1 Like
7

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.