Others have mentioned this, is it a recognised bug? Don’t remember experiencing this with my older ATV4.
Audio just slightly out of sync but still quite noticeable.
Amazon, Netflix on the Apple TV don’t seem to have the audio sync problems so feel it’s specific to Plex. When you change Apple audio to stereo from 5.1, sync problem improves. No issue with Plex on other clients like the LG Plex app, Kodi, Roku etc.
Using LG C7 Oled TV and using internal speakers.
did you get a solution to this - i have the same issue.
I also have the same issue it appears to be the plex client, as i have tested it with 3 other players and they do not have the problem
Same probleme here on my new ATV 4K and the Plex App.
When the audio line is 5.1 it break up. When it is a Stereo line no problem at all.
I try it on an other ATV 4 - there is no problem.
Both ATV have the same Software level.
I try it with my Samsung TV Plex App - it all worked well.
So I think the combo new Plex App and ne ATV TVOS dont work well 
What´s about Plex ? Any comments ?
Hi I am also having the sync issue. Its t=starts out fine but the further the movie the worst it gets. I have a roku, samsung smart tv, firetv, and they all work fine. It only happens with apple tv. I haven’t found anywhere a solution to this issue. And its not only me. My friend has an apple tv 4k and is also having the same issue.
Well, if you’d like some help troubleshooting you’ll need to post the following:
Plex media server version
Apple TV Plex app version
Video and audio encoding of the video you are watching
You’re responding to a thread that is at least six months old so it’s really hard to say if you’re having the exact same problem or a new problem.
I have a 4th generation Apple TV (not 4K version though) and also find regularly that there are audio sync issues. The audio is delayed by a fraction of a second on some content, not all.
Plex server is version 1.14.1.5488 running on Ubuntu 18.10. Apple TV app is 1.38 (11485)
I had a look at the encoding of content that plays fine, audio in sync:
Duration 46:43
Size 2.25 GB
Container MKV
Video Profile main
Codec H264
Bitrate 6698 kbps
Language English
Bit Depth 8
Chroma Location left
Chroma Subsampling 4:2:0
Color Primaries bt709
Color Range tv
Color Space bt709
Color Trc bt709
Frame Rate 25 fps
Height 1080
Level 4.0
Profile main
Ref Frames 4
Scan Type interlaced
Width 1920
Display Title 1080i (H.264)
Codec AC3
Channels 2
Bitrate 192 kbps
Language English
Audio Channel Layout stereo
Sampling Rate 48000 Hz
Display Title English (AC3 Stereo)
And comparing this with a file that has sync issues:
Duration 41:26
Size 660.62 MB
Container MKV
Video Profile high
Codec H264
Bitrate 1845 kbps
Bit Depth 8
Chroma Location left
Chroma Subsampling 4:2:0
Color Range tv
Color Space bt709
Frame Rate 23.976 fps
Height 718
Level 4.1
Profile high
Ref Frames 5
Scan Type progressive
Width 1280
Display Title 720p (H.264)
Codec AC3
Channels 6
Bitrate 384 kbps
Audio Channel Layout 5.1(side)
Sampling Rate 48000 Hz
Display Title Unknown (AC3 5.1)
Clear differences are the number of audio channels (2 vs 6), the video profile (main vs high), frame rate (PAL vs 24)
I started having the same issue when I ran the “wireless audio sync” on the Apple TV settings. This fixed a sync issue I had with my HomePod, but screwed up Plex. If I reset “Wireless audio sync” Plex is fixed, but my speakers get unsynched. Really annoying.
Is there a fix other than completely disabling the enhanced player? There was a post about the issue back in January where the plex team acknowledged the issue, but it doesn’t seem to have been fixed.
I have heard a lot apple TV users use Infuse player
Yeah I actually switched to it, only to discover it has the same issue!
Same here… infuse’s player is much better. Bitstreaming and no audio sync issues. Plex has a lot nicer UI though.
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