[noggin]

Yes - always worked - but as OE5 was now a little old - it did not work there ... technically it's just TrueHD with some extra bits - that we skip ... so passthrough works correctly.

We still don't understand Atmos - we just skip the bits, in decoding case we decode the TrueHD track ... passthrough does Atmos.

Is there even a standard for PCM 7.1 carriage of Atmos-style audio if we could decode it upstream? Would there be amps that accepted it without having to fudge the speaker arrangement somehow?

Sure you could decode Atmos 7.1 (which is I think 5.1 with 2.0 Atmos channels) to 7.1 and say - use the side or rear surround channels as Atmos channels - but would an amp setup for Atmos cope with that? Or would you need to ignore Atmos configs?