Use USB Camera and Microphone

Run lsusb to see the device, here I got the Microdia Camera, which is my USB camera (with microphone)

USB camera

Install fswebcam

sudo apt-get install fswebcam

To capture image, run faswebcam --help to get more details. For example:

fswebcam --no-banner -r 640x480 image.jpg

Note: USB camera works well with opencv.

Run arecord -l to see the audio device

To capture an audio, for example

arecord -D "plughw:1,0" -f dat -c 1 -r 16000 -d 5 test.wav

To adjust the microphone volume, run alsamixer -c 1, then press F5.

Run arecord --help to get more details.