Same here, i've done a lot of test and this is just shameful. Airplay is a proprietary protocol, they must know everything but no, it's a mess... bah
My configuration:
- Apple TV 4K 2017 *WIRED*
- Panasonic GZ950
- Airport Express 802.11n *WIRED* connected to Rotel RA-1062 ampli
All wired to the same Netgear gigabit switch
I've just reinitialized the ATV yesterday with no luck.
I've done some other test with my hardware:
- ipad (ipadOS 15.0) streaming audio to Airport Express via Airplay (Rotel output audio) -> A/V in sync
- ipad (ipadOS 15.0) streaming A/V to ATV4K (tvOS 15.0) via Airplay (TV output audio) -> A/V in sync
- iphone (iOS 15.0) streaming audio to Airport Express via Airplay (Rotel output audio) -> A/V in sync
- iphone (iOS 15.0) streaming A/V to ATV4K (tvOS 15.0) via Airplay (TV output audio) -> A/V in sync
- ATV4K (tvOS 15.0) streaming audio to Sony Headphones via Bluetooth (Headphones output audio) -> A/V in sync
- 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...
So disappointed after a so boring release without new features, that even broke things that usually worked
Hope for a RAPID fix in TvOS 15.1...