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BDP:
OPPO UDP-203 4K Ultra HD Bluray Disc Player (player with HDMI passthrough and analog surround 7.1 audio outputs)
Video Capture:
Blackmagic Intensity Pro 4K PCI-e capture card
USB Audio:
ESI U86XT USB audio interface
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-
With this setup you can record video and 5.1 or 7.1 audio at the same time.
Connection diagram:
flowchart LR;
Isolator["Ground
Isolator"];
Capture["Video
Capture"];
USBaudio["USB Audio"];
Box["Android TV"];
Box--HDMI-->NoHDCP;
NoHDCP--HDMI-->BDP;
BDP--"FL/FR
C/SW
SL/SR
(6ch RCA)"-->Isolator;
BDP--HDMI-->Capture;
Capture--"PCI-e
or
USB"-->PC;
Isolator--"FL/FR
C/SW
SL/SR
(6ch RCA)"-->USBaudio;
USBaudio--USB-->PC;
click PC "#software"
Notes:
The UDP needs to be set to Source Direct to pass through the video to the capture card.
Instead of this UDP you can utilitze any 5.1 pre-amplifier which supports an audio codec currently used by Netflix, Disney+, Amazon Prime, HBO Go, etc. If you use a pre-amplifier with variable output volume make sure you adjust the volume so you don't need to post-process amplification to it.
While Netflix has a desktop client from which you could separately record 5.1 audio, other streaming clients on Windows do not have this feature.