TrueHD 7.1 Soundtrack Dropouts

[Landlubber]

Server Version#: 1.32.5.7516
Player Version#:
nvidia Shield#: 9.1.1(33.2.0.157)
Plex Web Version# 4.108.0

The nvidia Shield is connected to the first HDMI port on a new Marantz Cinema 70s AVR.

Yesterday, during the opening titles of “My Fair Lady” (4K TrueHD 7.1), the sound kept dropping out despite the fact that the Marantz AVR decodes TrueHD 7.1. Sound playback is fine when Plex is set to AC3 5.1.

When I played this disc via an OPPO 203, which was connected to an HDMI port in the Cinema 70s, the sound playback was flawless. Thinking my original ripped file might be flawed, I re-ripped the 4K disc, but the problem with sound playback remains. As you can see below, the Plex monitor on my Mac mini shows that video and audio are not being transcoded.

I hope this following debugging information is what you need:

http://127.0.0.1:32400/web/index.html#!/logs

100545.webarchive.zip (12.4 KB)

By the way, I was told to compress these files because I use a Mac.

Any help will be appreciated. Thank you.

[FordGuy61]

Appears to be a limitation in ExoPlayer. ExoPlayer is the native Android media player. The Plex Android / Android TV apps use ExoPlayer to play media streamed from Plex Media Server.

PLEX audio dropouts and sync issues with seamless branching on 4K TrueHD/Atmos movies

Server Version#: 4.69.1 Player Version#: Windows 10 based rack server → PLEX server → MakeMKV 4K HDR Dolby Atmos movie → Cat6 Ethernet → NVidia Shield 2017 → PLEX player Sound drops and then goes out of sync when it comes back on EVERY seamless branch point in movie. Happens on the EXTENDED CUT of movies which use seamless branching. Examples of movies affected noticed by me and another MakeMKV user Black Hawk Down 4K (One I noticed) Halloween Kills 4K Fast Furious 9 4K The Martian 4K…

Seamless branching causes audio sync issues on Nvidia Shield when Dolby Atmos is enabled

Some bluray discs use seamless branching to store multiple movie versions on a single disc. When ripping this disc to an MKV file it creates some audio sync issues on the Shield when the disc has Dolby TrueHD audio enabled (DTS-MA works fine). The same file works fine on my PC, I think the issue is bound to the ExoPlayer. The video and audio go out of sync at specific chapter markers (at the branching cuts). When rewinding the movie in Plex the audio is temporarily fixed but goes out of sync at…

[VBB]

@Landlubber

during the opening titles of “My Fair Lady”

This is not a seamless branching disc, but it is one that was mastered with a 96kHz soundtrack. The Shield in combination with Denon/Marantz receivers (and perhaps others, too) has major issues with that. Strangely enough, 192kHz tracks play just fine.

See this thread for more info:

TrueHD 96kHz audio clipping on Nvidia Shield Pro 2019

Server Version#: Version 1.29.1.6316 (Running on Linux, no Docker) Player Version#: 9.11.1.36576 (Nvidia Shield Pro 2019) I have consistent audio “clips”, dropouts, or stutters when playing movies with 96kHz TrueHD audio. The dropouts are predictable and happen in exactly the same spots. (e.g. ~6:45 minutes into Dunkirk on the beach). It tends to happen in high-action scenes OR right before big scene changes. It occurs on multiple movies (all with 96kHz TrueHD tracks). The video doesn’t st…

[Landlubber]

I was about to edit my thread as follows when I found your replies. Two days ago, I watched East of Eden (4K TrueHD 7.1) without a hiccup from the soundtrack.

[Landlubber]

Where do I look to find the audio bitrate on a film? I tried looking under Get Info, but found nothing familiar. Thanks.

[VBB]

Get Info → scroll down to audio part → Sampling Rate

[Landlubber]

By chance, I opened the Marantz app while watching a TV show. For the first, it showed various types of file and playback information. Anyway, while I had the app open, I started both films and saw that My Fair Lady is 96kb, and East of Eden is 48kb.

Do Plex users have to wait for someone to fix Android or for nVIDIA to fix its Shield TV? Thanks.

[VBB]

Most of us here think this is an issue with ExoPlayer, just like the one with seamless branching disc rips. I don’t think either one will ever be fixed.

[Landlubber]

Let’s hope someone steps up the challenge regarding ExoPlayer.

Rereading the thread, I saw a statement about lip syncing issues. What I discovered is that stopping the playback and then resuming the playback can correct that problem.

[phoneguyinpgh]

I was having this issue watching Star Trek TOS movies. I found that by running them through HandBrake and transcoding the the Dolby True-HD to OPUS and leaving everything else the same it fixed the issue. I’m not sure if Plex can make an optimized version like that but it might be worth a try.