Video0 Camera Setup

Built-in camera mics are often poor quality. Use an external microphone (shotgun or lavalier) to ensure clear sound.

Look for lines containing UVC camera or videodevice . video0 camera setup

You should see something like: crw-rw----+ 1 root video 81, 0 Oct 24 10:00 /dev/video0 Built-in camera mics are often poor quality

| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | ls /dev/video* shows nothing | Driver not loaded or USB issue | sudo modprobe uvcvideo ; check lsusb | | Video is green/pink static | Color format mismatch | Force MJPEG or YUYV via v4l2-ctl | | 15 FPS max, but camera supports 60 | USB 2.0 bandwidth limit; app using high resolution | Lower resolution or use USB 3.0 port; check lsusb -t | | "Failed to open V4L2 device" in Docker | Docker blocks /dev access | Run with --device /dev/video0 and --group-add video | | Camera works once, then fails | App didn't release device | Reboot; or use sudo killall -9 chrome (Chrome hogs cameras) | | No audio from camera microphone | Audio is separate ALSA device | Find it via arecord -l ; it's part of video0 | You should see something like: crw-rw----+ 1 root