Ffmpeg record from usb

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Identify video source: 

ffmpeg -sources

Identify ALSA (sound) sources 

arecord -l    # you're looking for the card# and subdevice#

# when using within ffmpeg:   -f alsa -i hw:{card#},{subdevice#}

Preview the output video/audio (separately) 

ffplay -s 640x480 -i /dev/video0

ffmpeg -s 640x480 -i /dev/video1 -i /dev/vbi0 test.avi
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