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you can capture alsa something like this:

ffmpeg -f alsa -ac 2 -i pulse output.wav

or

ffmpeg -f alsa -i hw:1 -t 30 out.wav

or

ffmpeg -f alsa -ac 1 -ar 44100 -i hw:0 -t 30 out.wav

More information on: https://trac.ffmpeg.org/wiki/Capture/ALSA

Hope it helps