What you want is an HDMI capture card. Not sure if it will get all the channels, but its a start.
Or something like this that should be able to handle all the audio channels since that is in fact a thing for game streamers:
The Black magic cards according to the OBS forums members indicate that this card will capture all audio channels.
DeckLink – Tech Specs | Blackmagic Design
DeckLink are high performance capture cards for Mac, Windows and Linux with support for 12G-SDI and 8K.
www.blackmagicdesign.com
Also, you will need a device that strips copy protection from the signal.
Last edited: