this post was submitted on 05 May 2024
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Privacy
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It doesn't and I didn't ever mentioned HDMI in my reply. Just doubt if overlaying another encrypted stream with a muxer ever need that much processing power to the point of "prohibitively expensive".
Encrypted streams also don't have anything to do with a muxer, I really don't understand what you're trying to say. Muxers are for handling file formats, which is not being discussed at all, this is about raw video frame processing in hardware.
Well, I'm simply reciting what is described on the page based on my understanding. From the diagram, it does not do raw frame processing from the source (assuming HDMI w/ HDCP) as the stream remains encrypted. By the look of it, it is copy or passthrough to the muxer (as it labeled). With some magic, it muxes two encrypted streams into one and output to the video sink. How is that done I have no idea.
That diagram is describing the hardware side of the NeTV, which is an FPGA device doing all this. That "mux" is describing a hardware 2:1 mux on the raw video streams, such as https://vlsiverify.com/verilog/verilog-codes/multiplexer/
The "magic" is described here: https://www.bunniestudios.com/blog/2011/implementation-of-mitm-attack-on-hdcp-secured-links/
Got it. I can see where the problem is niw and how can the hardware is limiting. Thanks for the great article.