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This may not help, but here's a similar problem I've had in the past. When I cat the device file for my mouse directly (i.e., using cat /dev/input/by-id/usb-<mymouse>) I get output similar to what you get with your keyboard (i.e., gibberish). However, some mouse motions, like left click, don't generate any printable characters, so the terminal shows ...


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I routinely do this with ffmpeg, which has similar filters—so maybe this helps you. This assumes screen capture & pc audio in screen.avi, microphone capture in mic.wav. ffmpeg -i screen.avi -i mic.wav -filter_complex '[0:1][1:0]amix=inputs=2:duration=first[all_audio]' -map 0:0 -map '[all_audio]' -vcodec libx264 -crf 28 -preset slow -acodec mp3 out.avi ...


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Disregard the answer about need to initiate USB connection - it's already been initiated when you plugged in the device. If you just want to check if it's working, use dd if=/dev/ttyUSB0. If you want to actually read those characters, you need serial terminal. Use minicom (CLI, need manual), picocom (might figure it out on your own), cutecom (nice ...



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