I didn’t think I needed to suggest this feature. With Plex doing music (I don’t personally use it), I figured it is already supported especially since there is Tidal integration. But that doesn’t seem to be the case. I’ve read high-res music will always transcode to 48kHz. It’s not just limited to small population who listens to highres audio.
There have been some blu-ray releases with audio tracks with higher sampling than your typical 48kHz. Music related releases are like this sometimes and some films, latest 4K remaster of Akira, for example, does too. Akira has 192kHz sampling track and will struggle with the playback if audio is set to passthrough my AVR.
I only tested on Shield since that’s my main client of choice, but Plex on Shield cannot play my remux file properly with 192kHz audio track. Seeing as Kodi on Shield can play it perfectly fine, it’s not likely a hardware limitation.
And because we can’t manually trigger audio transcoding with films, I’m stuck using a lossy track instead of lossless one that won’t play properly. We need this feature.