Apple released an update for tvOS today, 12.0.1, update notes are very vague, but, wondering if it fixes Atmos issues?
No change for me still no sound when atmos is enabledApple released an update for tvOS today, 12.0.1, update notes are very vague, but, wondering if it fixes Atmos issues?
No change for me still no sound when atmos is enabled
According to Yamaha the Apple TV is sending a non-compliant signal by failing to transmit channel status information within the PCM/Atmos stream. Some models of amplifiers are therefore unable to decode the stream. Most of their amplifiers have a "workaround" (in their words) but that can apparently cause unexpected behaviours and it would be better if the source were correctly encoded in the first place.
This may not be the issue you're having but it's a diagnosed problem with the RX-VX077 and RX-AX040 series of amplifiers from Yamaha. If you're still having issues, I'd encourage you to submit a bug with Apple.