I just bought me some Rock Pi 4s to replace the old Raspberries here running Librelec.
So far, it looks good, even 4k films can be played (sometimes )
But I have noticed that Audio Passthrough to an external Amp really does not work with the Rock
Only static noise comes out of the Speakers (I've learned it the hard way last night, very late already.... bad karma...)
The Amp does not recognise any Dolby Digital or DTS Frames, instead it keeps on playing PCM, which explains the evil noise fairly well.
I found this thread, read it and hoped, there will be a solution, at least somebody is working on it right now.
But, I cannot make head or tails out of it, one says "yes", others say "no", one points to the "nightly" or "development" image (I've tried it right now, still no go )
So, at the end I feel quite lost.
a) is this problem known ?
b) does somebody work on it already?
c) if the answers are "no" what is the best place to report it???
You have to wait until mainline Linux support is added for Rockchip devices.
4.4 kernel images don't support audio passthrough.