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Looks great! Is there an FPGA board with HDMI in and out? I’d like to build an HDMI freeze button to transmit a single frame at the push of a button. (e.g. during a meeting or church when noticing mistakes on the PPT slides).


If you want something that's made for professional use, look at the BlackMagic ATEM series. I think that should have you covered.


Thanks, but I’d prefer open-source rather than professional.


Have you conaidered a £10 HDMI capture card? Not open source, or much of a project, but it would Just Work.


I've got an Elgato Camlink, but need the freeze button (e.g. CamLink input to a Raspberry Pi full-screen, feeding through to HDMI output, with a GPIO button to pause the live stream).




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