Plex Settings, right under Use Old Video Player.
Also be sure you Apple TV audio format is set to auto as well.
The TestFlight is full, last I heard, but the guy that could get you in or make room was let go.
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Thank you, man! I enjoyed our first evening of normal show watching again after 2+ weeks of misery. No audio drop outs after turning off the new audio engine. The Apple TV audio was already set to Auto, so that was it. If only Iād known this, all the hours I spent resetting, downgrading, etc. my homepods and AppleTV all for nothing. Thank you Plex! 
Sarcasm Look at twitter and how Elon fired all his important programmers, and how well that has gone so farā¦
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Agreed. Some of those Plex niceties I missed badly since my Emby switch (emby has nothing like PlexAmp for example). So actually, I think I may just keep using Plex 
But yes staying on topic, it seems the ATV4K is finally in a useable state now after all this time. +225 audio offset seems to be the universal fix for my setup. Iāve tried various 1080p and 4K UHD files and all seem to have audio in sync with the +225 audio offset engaged. So while this may not be the fix we wanted, Plex is finally useable for daily watching again on Apple TV 4K which is awesome!
Curious question for users who have Dolby Vision capable TVs, I notice Plex is triggering Dolby Vision for my DV Profile 7 mkvs. Is this whatās considered āfake DVā or is Plex playing these back properly?
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Fake.
Plex canāt do DV unless you use the old player and itās profile 5 mp4.
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Plex for Apple TV app 8.21 is again useless (without disabling features), like when 8.6 was dumped on usersācan not watch current TV, nor other HD content.
Sound fails completely (ie, no sound whatsoever) and scrub bar playback position UI become non-functional within minutes, often in less than three (< 3!) minutes.
Plex has done nothing for 16 days since crippling Plex for Apple TV.
Customers are helpless to restore 8.20 functionality.
.
Plex for Apple TV 8.21 AGAIN DungāCanāt Watch TV, nor HD Content; Useless like 8.6
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Working well for me on 2 Apple TVs so far. Although Iām mostly playing my own ripped content and my family use the other one and they watch live TV on that as well. The new audio engine seems to work much better for us as 1 ATV has no audio sync and the other is fixed with +225 offset global setting.
The app does have some bugs though and Iāve noticed if I try to change the audio channel while playing a show or movie, the app will crash completely.
4K 60hz does not play and stutters (Gemini Man 4K for example) so hope they fix that.
Plex on Apple TV is headed in the right direction at least! This is the first time Iāve been able to actually use the Plex app to watch things without issues. Hopefully they keep improving it and fix all the reported bugs and issues here.
Oh ok I figured as much. I wish it wouldnāt trigger DV on my TV as it seems to make the movies much darker overall. Hope they fix that!
I should add some clarification. In my experience, WRT OTA broadcast content:
Plex audio-video sync stinks, and has NEVER been correct during the 16 months Iāve used Plex:
- PMS for Mac 1.25.8.5621 ā 1.32.4.7195,
- Plex for Mac 1.46.1.3056 ā 1.73.1.3905,
- Plex for iOS 8.5 ā 8.20, and especially
- Plex for Apple TV 8.5 ā 8.21;
regardless of settings being enabled/disabled (ie, [On] | [Off]):
- āAutomatically Adjust Quality,ā
- āAllow Direct Play,ā
- āUse Old Video Player,ā nor
- āUse Old Audio Engine;ā
for all content resolutions:
- 1080i,
- 720p, and
- 480i; and
for all OTA Live TV watching modalities:
- āliveā (while not scheduled to be recorded),
- āliveā (while scheduled to be recorded), or
- having been previously fully recorded.
.
.
Since March 2022, there has not been one single combination of Plex Apple releases, nor settings with which AV sync does not fail regularly and repeatedly.
.
.
(Iāve read folks post in topics of tuning AV sync. I have no doubt, for Apple releases at least, that any such notions of adjusting Plex AV sync are completely specious.
More broadly than Plex, I wonder if underlying streaming protocols may be fundamentally misguided.)
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I am finding that +225ms is good for almost everything with a non stereo track.
For stereo, little to no offset is needed. Though there seems to be some variance between certain stereo encodings? I need to do some more tests there.
The fact that I have to enable and disable the offset at all for different audio encodings is frustrating.
I take it non of the files you are ripping contain TrueHD audio tracks? Or at least that youāre not retaining it?
Cos absolutely nothing will play at all if the audio is TrueHD.
Donāt get me wrong Iām all for Spatial Audio so was pretty hyped up (and thought I might be able to switch over from Infuse) but even thatās implemented in a semi working way.
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I have a lot of blu-ray and 4K UHD blu-ray files that have TrueHD Atmos audio tracks and so far the ones I have played are working fine across 2 different Apple TV setups. I have direct play enabled, Old Video Player set to off, Old Audio Engine set to off. While it does transcode TrueHD itās working well for me.
And yeah spatial audio is working pretty well however itās only in stereo. Infuse spatial audio is multi channel surround I think? The way itās looking we may not need Infuse if they keep improving the app which Iām looking forward to!
+225 seems to work for the few stereo tracks Iāve tried. The new 4K blu ray of National Lampoonās Vacation for example has a DTS-HD stereo track, and +225 offset is working for me.
I do think Dolby has a stereo format as well so not sure if the different stereo formats will behave differently. Iāve played a wide variety of audio tracks and havenāt had to adjust from +225. So far Iāve played:
AC3 5.1
TrueHD 5.1-7.1
DTS-5.1
DTS-HD 5.1-7.1
DTS-HD 2.0 Stereo
Only TrueHD audio tracks require transcoding so far.
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Interesting.
A confirmed issue with True-HD. Nothing in the last TestFlight addressing it and now suddenly all my True-HD/Atmos are playing fine.
I suspect that any work done on the new Audio player doesnāt rely on a client update. (Thinking back to a couple of weeks ago when the new player was deliberately disabled for a while and it just vanished from options without a client update.)
The downside of that is thereās no way of knowing if something gets fixed/changed. So hopefully we get Multi-Channel Spatial Audio at some point.
None of this will matter for me though unless they cut out the fake Dolby Vision bullshit.
As you mentioned in another post āyou hope they fix itāSadly though itās classed as a feature not a bug. Infuse have this nailed already with an option to play HDR instead of Fake DV. Or go down the Fake DV route for the weirdoās.
Overall though Iām more hopeful now.
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To add.
Confirmed here that changes to the new Audio Stack donāt rely on an update.
New Audio Engine & Spatial Audio - Works for DTS, EAC3, AC3, Errors with TrueHD - #37 by BigWheel
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Just dropping my experience with latest update and new audio engine, not seeing any difference. All other apps (including Infuse) require ~100ms delay on my soundbar, Plex is still ~200ms for old player (new player requires more than my soundbar max delay of 300ms).
Does anyone know if the new audio engine was meant to fix the issue? Or is it unrelated?
One other thought I had on this is seeing how the Infuse direct PMS connection pans out when it becomes available. Either way at Ā£10 a year I will probably keep Infuse alongside Plex.
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Is there any more info on this I can dig into?
Edit: Found it, New direct mode for Emby, Jellyfin, and Plex - General - Firecore
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Sounds like you have also have a local device chain sync issue, in addition to the Plex specific software sync issue.
Did some testing with some AAC stereo tracks, and the +225 is a no go. 0 is perfect with those.
Aac has never been an issue
