(I accidentally deleted my first topic when I was trying to edit it with more information and can’t seem to undelete it. Sorry, forum mods! ••EDITED FOR LANGUAGE••There might be two topics now that are extremely similar.)
I was testing the audio sync on a file (that I later realized was actually out of sync within the file itself) but while testing that I discovered an interesting bug.
If you use the Apple TV 4K built-in “wireless audio sync” function in the video and audio options and let an iPhone listen to the audio, it goes crazy out of sync in Infuse. Weird!
How to reproduce the bug:
On the Apple TV 4K:
- Set output to 4K SDR 60 hz, match frame rate as well as match dynamic range. (Not sure if these steps matter?)
- Run the wireless audio sync test on each different frame rate in both SDR and HDR you may use. Important! This means you need to switch the frame rate manually and run the wireless audio sync by holding up your phone to the TV while it goes “bloop-dee-bloope-doo”. You can then switch back to 4K 60 SDR.
- Now attempt to play a 24 fps (or 23.98 fps, or 25/50) video in Infuse. The audio will be almost a second out of sync! Streaming apps such as Netflix/HBO/ATV+ do not go out of sync, so it would seem to be an Infuse thing, perhaps because it uses the Infuse player and not the standard Apple TV player.
- It appears you can trigger it easily by starting a file, skipping backwards or forwards a bit and the audio will be out of sync.