There is a bug in the latest Apple TVOS version 18 firmware update with Dolby audio output and it isn't fixed yet. I have had Atmos not show up at all or being reported as Spacial Audio. Others report Dolby 5.1 is now just 2.1 stereo
Lots of complaining here but Apple is aware of it and working on a fix.
To be clear this is a tvOS 18 bug, not a Channels bug.
I'm not sure why we even update tvOS in the Fall at this point to be honest. Every year it's just months of bugs before it's stable again, and then they break it all over again in September.
Right...I'll edit the original post to make it clear
If it means anything to you it has been reported that the SDK API function AudioConverterFillComplexBuffer has stopped working for EAC3 in tvOS 18." That function apparently is not broken for macOS. It appears that only a software update is likely to provide a remedy.
This issue does not affect Channels and is effecting other streaming apps that utilize the system video player.