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Set up Wireless Audio Sync with Apple TV - Apple Support
https://support.apple.com/en-us/HT210526#:~:text=You%27ll%20see%20a%20notification%20on%20your%20Apple%20TV,If%20it%20still%20fails%2C%20contact%20Apple%20Support%20.
Audio sync issues with Apple TV (4th Gene… - Apple Community
https://discussions.apple.com/thread/8371296
Audio sync issues with Apple TV (4th Generation) I have a 4th Generation Apple TV. When I watch video content from any source (iTunes Store; Netflix; Amazon Prime; YouTube; streaming from a remote computer; etc.) the audio progressively goes out of sync with the video. It starts out fine, but it gets more and more out of sync as I watch the video. This can be reset …
Apple TV 4K to tvOS 15 wireless audio syn… - Apple Community
https://discussions.apple.com/thread/253207158
You can try 15.1 and sharirport sync work flawlessly. Or build shake port-sync for airplay2 keeping 15.0. In both cases the issue is resolved. View answer in context Q: Apple TV 4K to tvOS 15 wireless audio sync issues
Apple TV sound out of sync - Apple Community
https://origin-discussions-us.apple.com/thread/253181517
ATV4K (tvOS 15.0) streaming audio to Airport Express via Airplay (Rotel output audio) -> A/V out of sync, video judder and stutter The same happens in all refresh rates (60,50,25,24hz), video modes (SDR,HDR,DV) and with frame matching on or off. So the problem seems indeed a problem of the new video player in tvOS 15.0 with airplay...
Apple TV tvOS 14.6 stable update should address audio sync ...
https://piunikaweb.com/2021/05/20/apple-tv-tvos-14-6-stable-update-should-address-audio-sync-issues/
These workarounds involved tweaking the Wireless Audio Sync calibration and Match Frame Rate option. While the said tweaks resolved the audio sync issues for some, most Apple TV users could not get rid of them. (Source 1, 2) However, affected users may not have to wait for long as an upcoming tvOS update might address the audio out of sync issues.
Apple TV 4K (2021) Audio Sync Issues : appletv
https://www.reddit.com/r/appletv/comments/o6hbzf/apple_tv_4k_2021_audio_sync_issues/
The audio sync issue is such that the audio appears to be AHEAD of the video, and as such, adjusting audio delay further through the soundbar isn’t an option. Sync issue also appears to be pretty consistent across Netflix, Hulu, etc - so not just one platform.
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