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Antonio Brittenham

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Aug 2, 2024, 7:29:52 AM8/2/24

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Whenever I play Dolby Atmos content, there is a delay in audio playback in relation to the video. Dialog is slightly out of sync from lips. Explosions are heard slightly after you seem them. The delay is about 1/6 of a second.

I play with the AV delay of both the TV and the soundbar and was not able to sync the audio and video. The lowest setting on the AV sync is the closest I can get the audio to the video. Increasing the setting makes it worse.

Additionally, I also tested the Samsung TV's native Netflix app since it is the only one that outputs Atmos through the eARC. No sync issues with the TV's native Netflix app when playing Atmos content.

Are people still having A/V sync issues with their ATV box? I'm going from ATV>Receiver>TV. For me the video lags behind audio in some apps, not all, and to varying amounts if I have "Match Framerate" turned on. Turning it off fixed all syncing issues, but now all the apps feed content to the TV at 60fps instead of matching 24p material correctly. Match Framerate was one of the main reasons I bought this thing, and it's the only advantage this device has over the Nvidia Shield as an ultimate home theater streaming device. What's the point if I can't even use this feature??

I have the same problem with a Philips TV (65OLED907) with a built-in soundbar. Apple TV4K (latest version) has sync issues in all streaming apps (Apple TV+ is actually worst). I noticed a big improvement with tvOS 17.1 where a few episodes and films (Netflix and Prime) played without sync issues. This was not consistent, however, and most content and other apps are unusable with Atmos due to syncing. Native apps on the TV play Atmos without sync issues of course. Using the shortest possible and most expensive HDMI-cable (8K etc.) cable I could find.

I am having the same issue with syncing on Atmos content. Switch the Apple TV to 5.1 and no issues. I have tried so many combinations of settings, switched out all HDMI cables with brand new ones, reset to factory defaults all components and nothing. LG TV native apps with Atmos work flawlessly including the Apple TV+ app. Apple TV box is a no go on Atmos content. It is killing me. Any resolution for anyone yet? I signed up for beta in hopes that a beta update on tvOS might fix this. I was considering a new TV thinking that was the issue. Does eArc help?

That's all well and good, but one of the main reasons I bought this device was because of the framerate matching to run a pure clean 24fps signal to my TV. Bypassing it defeats the purpose of using this over another streaming device like the NV Shield Pro (which has better audio format compatibility anyway). This needs to be fixed or at least give us a manual AV signal delay control slider so we can sync it up ourselves without relying on having to own an iPhone to automagically do it (and still have it be wrong!)

I have updated software several times and had Comcast out to re-run a line to my place to fix internet speeds. The issue goes away if I exit out of the show (without exiting out of the app) and then starting it again. This issue has really only popped up in the past year, but it is consistent and happens multiple times a day.

Have you tried removing the channel that you are experiencing the issue with from the Roku home screen? Then, disconnect your device from power for a minute. Plug it back in, then try to add the channel back once more and see if this clears up the issue.

I have been experiencing exactly the same issues as you with my new Hisense U8H TV and my Roku devices. I have tried both a Roku Ultra and a Roku 4K+ stick and have the same problems. It is only with Xfinity Stream app, which is what I use 99% of the time. I do not have a soundbar. Have tried everything listed everywhere, and, as you, just backing out of the program and going back into it fixes the issue temporarily. This audio synch or volume issue happens multiple times per hour and is very annoying. I have used the same devices on a Panasonic plasma screen TV and have not had the same audio issues. I am ready to chuck the Roku streamers!

In the meantime, please help us with the required details below so we can send additional information for the investigation to our engineering team, and once more information is available I'll be sure to let the Community know:

We understand that you're having a problem with the Xfinity app. I'd love to help you with that. We would like to know what went wrong so we can assist you further and fix the issue, but we need more details.

I notice while watching TV or the TV's Netflix app, the audio can do out of sync (very noticeably behind the video). It's goes badly out of sync when watching Dolby Digital content, especially after pausing/rewinding.

The audio is out of sync only under certain circumstances e.g. using the TV's Netflix app to play Dolby Digital content and skipping backwards/rewinding. Sync is not immediately out when I first start watching Dolby Digital content, but something, possibly interrupting the bitstream, seems to confuse the AVR.

I am also getting pretty awful and unreliable audio sync with my STR-DN1080, particular when watching discs on connected BluRay or UHD players.

The 'AV Sync' menu, which allows you to make adjustments in 10ms jumps, in one direction, isn't much help, and the 'HDMI Auto' option is useless.

Can also confirm sync-issues, particularly when using chromecast casting Youtube-videos and sometimes also Netflix-content. Pause and fast forward intermittently solves the problem, but the problem randomly reappears.

The audio is okay with the soundbar off but when using the soundbar the audio drifts after about 5 mins. I have tried Dolby On/Off settings , audio delay set to 20m/sec and follow audio On/Off. All work for 5 mins then drift.

Hi, I have same equipment sony tv and sound bar , sound disappears completely once or twice every hour . Switch off sound bar and back on sound back .Like you tried new leads and every setting on box ,rebooted bar and tv still same . No fault if box off and just tv on & blu Ray on . Never had this fault on V6 . Got to be glitch in box , not impressed as Virgin don't seem to be interested about fix.

I always try to sync to a live broadcast like the news, you can nearly get the presenter in sync but if they show a video interview on the program the sound will be out of sync on the video, I know there can be technical reasons for this but quite often it is a long way out. Like you I never had a problem with the Tivo V6, also I like the way they tried to deflect the problem to your sound bar which was ok before the 360.

Hi there, first time post and new Sky Stream user here.
Slowly getting used to Stream, but one thing that's bugging me is lip sync. Having searched these forums I see I'm not alone, which is both comforting (that it's not just me) and disappointing (that Sky don't seem to have fixed the problem)

My set up is Sky Stream connected by HDMI to Panasonic OLED which in turn is connected by HDMI ARC to a Panasonic Soundbar. I've tried all the differing options on the Stream box with varying results. In general, selecting PCM stereo seems the most stable but even that drifts out when streaming from some apps. I understand that Auto should give the best sound depending on source, and that Dolby Digital Plus and Dolby Digital 'force' the box to output audio in those formats (have I got that right?) But I don't understand what the 'Passthrough' option does. Can anyone enlighten me?

Pass through forces the the audio 'bitstream' to be output for external decoding, without decoding it first. PCM Stereo decodes the audio bitstream in the Glass/Stream puck, downmixes it to stereo and outputs it for external amplification. DD+ outputs a DD+ bitstream for external decoding, DD outputs the older Dolby Digital standard for external decoding (for older AV amplifiers, soundbars and TVs that do not support the newer DD+ codec/standard).

PCM stereo is the oldest and probably most widely supported by TVs etc, DD is next and can support 2.0 (stereo ) and 5.1. DD+ is newest and can support stereo, 5.1, 7.1 and Atmos but is the least widely supported.

@CoffeeDrinker thank you for taking the time to explain the options in such detail and clarity. If I've understood you correctly, then passthrough on the Sky Stream box might be the best option for me, allowing the tv to decode the audio and passing it on to the Soundbar. I'll experiment and see how it goes. Once again, thank you for your time.