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I'm looking for hardware that allows me to take an existing hdmi signal, alter some pixels (for example, set the center pixel to red) and output the signal to an arbitrary HDMI television. The whole procedure should not introduce too much additional latency and work at 4k 60fps.

So far I figured out that FPGA's could be used, but I haven't found one under 2000$ that seems to be able to do that at 4k60fps and optimally I'd like to find some board that is dedicated to exactly this - so have one HDMI input, one HDMI output and some programmable stage to perform the signal processing.

Can anyone recommend hardware for this purpose?

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