I’m on an Apple TV 4k on TVOS 14.5, Infuse Pro 6.6.4 (3552), with an LG 65C9 over eARC into a Pioneer VSX-LX503 receiver.
I’ve noticed that some Dolby Digital Plus Atmos samples aren’t working with Infuse on the ATV4k, for instance some of the samples here: Dolby Trailers - The Digital Theater
Of the ones tested, the Chameleon, Core Universe, and Dolby Cinema - Universe samples only pass 7.1 LPCM to the receiver, while the Nature’s Fury video passes Atmos properly. I have made sure the DD Plus track is selected in Infuse, but just to make sure it’s not some glitch with other tracks interfering, I also tested by remuxing the Chameleon sample into mkv with only the eac3 track with same results.
I noticed that the ones that don’t work show eac3 8 channels in MediaInfo, whereas the ones that work show 6 channels, don’t know if that has anything to do with it.