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> 4K HDMI -> USB capture devices are so cheap these days.

FWIW: Most of these cheaper devices will actually be ~720p max upscaled.

https://www.naut.ca/blog/2020/07/09/cheap-hdmi-capture-card-...

The new ~$5-10 USB 3.0 ones using MacroSilicon MS2130 do real pixel perfect fullhd@60Hz. Here in use as the cheapest and simplest (no need for custom drivers for EZUSB3 dongle) way of transferring data from FPGA board to PC at 180 MB/s https://github.com/steve-m/hsdaoh https://hackaday.com/2024/06/01/use-that-one-port-for-high-s...

Yeah, the cheapest good-ish solution is the ~$100 elgato camlink 4K, which will give you 4K 30fps in. It works well enough. Skip the really cheap crap, as you say.

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