I have been an HTPC person for years and just recently purchased an Apple TV (4K), pretty much solely to run the Channels DVR app (which works great). I also have a Plex server that stores blu-ray rips (.mkv).
I thought I would be able to ditch my aging HTPC and just use the Plex app, but I quickly discovered that the ATV will not let me bitstream to my receiver (Yamaha TSR-7810, hooked up via HDMI from the ATV). My speaker set up is 5.1.2 at home. Some threads on Reddit led me to Infuse, which I purchased and installed on the ATV before I realized that the passthrough is no longer working as it was a few months ago.
When I play back a ripped Blu-Ray that has 7.1 or 5.1 sound, it still sounds pretty damn good in my limited testing. The receiver is showing “PCM” (instead of DTS or something similar), but it’s not clear to me if I’m actually missing out on anything or if I’m actually getting LPCM and it’s just the ATV doing the decoding.
My dumb question - what am I actually missing out on by not being able to have the 7.1 audio be bitstreamed/passed through to the receiver?