Only had a few minutes but tested a few TrueHD movies. Largest was about 40GB.
All played well. My Denon reported either Atmos or PCM for input.
Lip sync and all appeared good even with slipping forward & back or jumping chapters.
I did have 1 MKV that gave an error playing. AV1 video with TrueHD audio. I clicked on the button to submit it for review.
This file plays fine in Infuse & Plezy with the native players, but obviously all height info is lost.

Thanks again for this effort.
As others have said, concentrate on the player first. Plex & other integration later. External player works fine for now.

Let us know when we can contribute $$$ to the cause!