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I figured it out; I hope my solution will help others. For some reason ZoomAudioDevice the '0' slot in my devices. Why in the world wouldn't that be reserved for the Built-in Microphone, ALWAYS? To make matters works, the ZoomAudioDevice was not in the Settings Panel in BigSur, so it couldn't be removed manually. I had to Uninstall Zoom, then do a command-...


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Specify bitrate as -b:v 0 made the trick forme, the overall bitrate bumped from 2m to 16m. ffmpeg -i in.mp4 -c:v h264_nvenc -b:v 0 out.mp4


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