v4l2-ctl -d /dev/video0 --list-formats-ext Set a specific resolution/framerate (example):
guvcview -d /dev/video0 List supported formats:
ffplay /dev/video0 Or :
Here’s a helpful review of setting up a camera (typically a USB webcam or embedded camera on Linux, mapped to /dev/video0 ). 1. Quick Check: Is the camera detected? Run:
vlc v4l2:///dev/video0 Or (simple GUI):
v4l2-ctl -d /dev/video0 --set-fmt-video=width=1280,height=720,pixelformat=MJPEG v4l2-ctl -d /dev/video0 --set-parm=30 | Issue | Likely fix | |-------|-------------| | Device busy | sudo fuser /dev/video0 → kill that process | | No image / green screen | Camera may need MJPEG not YUYV ; set format explicitly | | App wants video0 but camera is video2 | Create symlink: sudo ln -s /dev/video2 /dev/video0 (temporary) or use udev rules | | Permission denied | Add user to video group (see step 2) | 6. Persistent device naming (recommended) To always map your specific camera to video0 , create a udev rule:
# Find camera VID:PID lsusb # Then create /etc/udev/rules.d/99-camera.rules: SUBSYSTEM=="video4linux", ATTRSidVendor=="xxxx", ATTRSidProduct=="yyyy", SYMLINK+="video0" Don’t rely on /dev/video0 being the same camera after reboot or plugging in another webcam. Use V4L2 device names or udev symlinks for stable access. video0 camera setup
Would you like a specific fix for the error or app you’re using with /dev/video0 ?