A bit on pricely side... (~900 usd) but in theory should be supported by out-of-tree v4l2 (gpl2) driver.. https://github.com/aja-video/ntv2-v4l2 https://www.aja.com/products/kona-hdmi === Features 4K/UltraHD/2K/HD/SD up to 50/60p 4x full-size HDMI inputs each with 8-channel embedded audio HDMI 2.0 (port 1 & 2) and HDMI 1.4b (ports 3 & 4) RGB 4:4:4 12-bit, YCbCr 4:2:2 10-bit and HFR workflows supported Simultaneous capture of 2x 4K/UltraHD or 4x 2K/HD Capture stunning HDR from cameras, game consoles, and more PQ, HLG, HDR10 and Dolby Vision Support* HDR Metadata Capture Video4Linux (V4L2) and DirectShow support Compatible with leading creative apps such as Telestream® Wirecast®, vMix® and more ==== of course it will be interesting to know if such card/driver actually work with CinGG's v4l2 capture implementation....