I actually purchased this back in early 2018:
https://www.amazon.com/dp/B074JFXJG6
It was $350 at the time + an m.2 pcie expansion card to put it in.
I was able to get it to capture video, but it was raw and file sizes were huge.
I had been using the Hauppauge capture devices for quite some time with SageTV. That was the only other device that was ever able to capture in 5.1 channel audio, but the video quality was quite soft. The newer HDMI encoders really have some sharp video, so that's been the tradeoff for losing 5.1 audio. Ever since making the switch to 2 channel audio I really don't watch many movies on the old 7.1 channel entertainment center.
The next couple generations behind me just don't seem to care about 5.1 channel audio, or linear television for that matter, or watching on any screen bigger than 7". That said, I do watch the latest HDMI encoders to see if one of them emerges with the capability to capture the closed captions as a separate track in the video file. Unfortunately it appears that the source must be capable of feeding that CC data in a way that current options can't do.


