No Audio of Apple TV Swiftfin 7.1

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I don't think this is limited to tvOS. I have issues with 7.1 audio and avoid it like the plague. Originally it was an issue with Opus 7.1, but now it seems it doesn't matter what codec I try, I cannot get 7.1 to work with a 5.1 compatible TV. Is there a setting to force transcoding in one way or another? I know you can set the supported number of channels in some apps (requires using non-external player). The other option is to try and see if you can lower the allowed bitrate to see if transcoding is triggered at some point.