There are two modes in Sync Mode that adjust playback speed to bring video FPS to the same rate as the display FPS: resample audio, and drop audio. The resample mode will actually disable the display mode adjustment if passthrough audio is used. But the drop audio mode should still work. PMP might not be properly dropping passthrough audio packets on packet boundaries, or not insert the correct thing to get silence, so results could be mixed depending on the A/V receiver. Generally it seems to work, though.
Iâm still having the same issues as OP. It doesnât happen all the time and I canât find a variable that matches when it happens specifically.
When viewing through Chrome, or pushing through to my Chromecast, the audio stays in sync. This only happens using the PMP (currently running Version 3.14.1) on Windows 10.
Anything else I can provide for you guys? Iâm not passing audio through anythingâŠjust PMP on Win 10.
I am seeing this as well. I have seen it with different files on different devices. Web, Plex App, chromecast, and Roku Premiere.
Not real sure how to troubleshoot this one. It does it with H265 transcoded to a device as well as Direct played H264 files to a device.
If I pause or FF/RR a few seconds it immediately syncs back up and I get another 30 or so minutes before the drift is noticeable.
-Casey
I am also having audio sync issue. Only on the newer interface versions of the software. It seems to drift. When I go back to the old plex home theater, there is no problem.
Using the Allow Display Mode Switching function. Tried both hardware/software decoding. Same issue. Only fix is go back to old home theatre. I donât remember having this issue in early versions of PMP, it only came in when the new interface was introduced.
v1.3.11.729
have tried everything on this thread and still get drift every 30 mins or so
@SD71 said:
v1.3.11.729have tried everything on this thread and still get drift every 30 mins or so
Check Marking the box âAllow Display Mode Switchingâ solved it for the most part for me. That said, I do get TV shows once in a while that start out of sync then come back in line within a couple minutes. I need to stop the show and restart to see if its PMP or the show though. Been too lazy to restart lately.
I currently have allow display mode switching active, and resample audio
This has made those files that where really bad much better but has added issues to lots of files that had none before.
somehow Iâve broken the volume control in PMP as well it no longer has any affect on the volume
I couldnât even find the âAllow Display Mode Switchingâ option until I finally saw that it was only in the âTV Full Screenâ mode, which I never use. So - just regular PMP viewing has audio drift as well, I guess.
I also have the audio sync problem after about 20 minutes or so. Just pausing the playback and starting it again fixes it but it slowly gets out of sync again.
The configuration is a Windows 10 PC, running Plex Media Player 2.3.0 connected to the latest version of Plex Media Server that is running on the same PC. The player is running in full screen mode and the PC is connected to a HD projector via an HDMI cable.
I uninstalled Plex Media Player 2.3.0 and reinstalled Plex Media Player 1.3.5 and it works fine with the same configuration and no audio sync problems.
I grew tired of the issues that having an HTPC presented. This sound issue, among others. It seems WIndows is way behind the curve and I was continually having to fiddle with it. Found a posting on AVSForums that summed up the same thing I was feeling and based upon what I read there I went and picked up an Nvidia Shield to be my player.
Had it a month and havenât looked back. HTPC is sitting on my office floor now, unused. Too bad too, I spent a fair amount of money to get it looking like another piece of AVR equipment. The Shield is about the size of a large cell phone, just thicker and can pass through all the HD audio codecs (DTS-HD, DTS-X, TrueHD, Dolby Atmos) and 4K with HDR10. If youâre having constant issues, Iâd encourage you to take a look at that.
I personally canât stand using Windows anymore for HTPC. I find myself caught between three devices at the moment:
1. Embedded PMP for SD/HD content
2. Plex app on NVIDIA ShieldTV for UHD content
3. Infuse Pro 5 app on AppleTV 4K for SD/HD/UHD content
So, Iâm happy to report that im also experience this new feature.
Sound starts to drift after some 5 min or so.
A paus/ unpaus solves the problem momentarily.
Doesnât matter if itâs direct play or transcoding.
Iâm on Version 1.11.3.4803, running a X99 I7-6800K & 32GB memory.
I fixed the audio sync issues I was having with Plex Media Player on Windows 10 by replacing some of the OpenGL libraries that PMP uses (from Qt?) with ANGLE versions from the archive of the latest Chromium. However, my problem was with a constant and immediate audio desync with display switching on a TV supporting true 24Hz and not some kind of synchronisation drift on a 60Hz display.
In any case, to try it youâll want to backup and replace âd3dcompiler_47.dllâ, âlibEGL.dllâ and âlibGLESv2.dllâ from the PMP installation directory with the files of the same name from the Chromium archive.
Tried it after reading someone suggest it in these forums, but I canât remember who it was or which thread it was in.
1 Like
Just wanted to say i am having this exact same issue as well. Mainly with HEVC x265 mkv encoded video, but has happened with other files as well. Direct play and transcoded.
I have an older laptop in my bedroom as my plex client. Tried both google chrome client and PMP client. I even did a fresh install of windows 10 and literally only downloaded drivers, google chrome, and PMP. Still have the same issues.
Laptop (client) specs: i7 2640m, 8gb ram, nvidia gt 525m gpu, video+audio sent to a sony 1080p tv over hdmi.
Same issue here. Terrible lip sync issues on recorded TV. I`m using plex for Xbox one for playback. Hope someone is working on thisâŠ
I have followed @Warmongerx advise and invested in a Nvidia Shield for player and Plex Server and wow! Wish I had done that ages ago, too much frustration with trying to resolve the issue. Now happy as we can watch a movie without sound drifting! Thanks @Warmongerx !
Glad to hear it Paul-A B) I wish Windows and PMP were a better fit as I like having the utility of a desktop on the TV. May have to revisit it at some point.
I tried playback on my Nvidia Shield TV (Gen 1).
And Iâll be damnd, no issues what so ever.
Whoopdeedoo.
Letâs just hope they fix that in the next release. 
@Mattias_Eriksson said:
I tried playback on my Nvidia Shield TV (Gen 1).
And Iâll be damnd, no issues what so ever.
Whoopdeedoo.
Letâs just hope they fix that in the next release.
Are you all using this in a projected environment? I too am tired of sync issues and fiddling with this every single time I want to watch a movie. It ruins the experience to continuously tweak the movie after itâs started just to have it work correctly (granted thatâs not a drifting sync issue but a a/v sync issue nonetheless).
Yes, indeed, this is exactly why followed the advice and bought the NVIDIA and no regrets at all, no more frustration when you want to watch a movie! Love Plex but now hate the PMP and think it really hurts the reputation of an otherwise fantastic product!
