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I am having the same issue, although I am running Debian Buster (64) on a Pi4. I am accessing via VNC on a 27" iMac (2560x1440). So what I have to do is: $ cvt 2560 1440 60 This generates the mode line for the command below (only necessary once) After reboot I have to run this: $ sudo xrandr --newmode "2560x1440_60.00" 312.25 2560 2752 ...


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I believe it should be possible, with some small caveats for disk usage and/or encoding quality. Most of the cheaper USB HDMI capture devices, such as the ones described here present as a UVC video source, which is natively supported in Linux. The raw stream from this can easily be captured using ffmpeg, provided the SD card or USB disk attached is fast ...


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