ffmpeg -f avfoundation -list_devices true -i ""
Note [] in the list beforementioned
ffmpeg -f avfoundation -i "<screen device index>:<audio device index>" output.mkv
ffmpeg -f avfoundation -list_devices true -i ""
Note [] in the list beforementioned
ffmpeg -f avfoundation -i "<screen device index>:<audio device index>" output.mkv