I've got two systems running fine with hyperion-ng using WisFox and Y&H HDMI capture cards.
But both card are only able to capture audio in stereo.
Is there any usb hdmi capture card which does support more audio channels (at least 5.1)?
I found the AverMedia Live Gamer 4k but it is an PCI-E device which makes it hard to use with an raspberry pi.