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Viideo Capture

Hello. I will do a project. I need ideas for this. While projecting the 4K image from VGA or HDMI to the screen in 4K, when I press the button, it will save the video or photo to the flash memory. DSPs seem to be suitable for doing these operations. What products do you recommend that I can find in the market that I can do this job? Thanks in advance for helping. Have a nice day.