How to record audio with ffmpeg

Lets first figure out which source we will be recording from:

pactl list short sources | grep monitor

ffmpeg -f pulse -i 'alsa_output.usb-Razer_Razer_Leviathan_V2_X_000000000000000-01.analog-stereo.monitor'        -c:a libmp3lame -q:a 2 supremecourt-oralarguments-20251008.mp3

or, use default currently in use:

SINK="$(pactl get-default-sink).monitor"
ffmpeg -f pulse -i "$SINK" -c:a libmp3lame -q:a 2 supremecourt-oralarguments-20251008.mp3

Use pactl to discover and select the correct monitor.

And use ffmpeg to capture and encode in one shot.