v4l2-ctl

Control video devices.

• List all video devices:

v4l2-ctl --list-devices

• List supported video formats and resolutions of default video device `/dev/video0`:

v4l2-ctl --list-formats-ext

• List supported video formats and resolutions of a specific video device:

v4l2-ctl --list-formats-ext --device {path/to/video_device}

• Get all details of a video device:

v4l2-ctl --all --device {path/to/video_device}

• Capture a JPEG photo with a specfic resolution from video device:

v4l2-ctl --device {path/to/video_device} --set-fmt-video=width={width},height={height},pixelformat=MJPG --stream-mmap --stream-to={path/to/output.jpg} --stream-count=1

• Capture a raw video stream from video device:

v4l2-ctl --device {path/to/video_device} --set-fmt-video=width={width},height={height},pixelformat={format} --stream-mmap --stream-to={path/to/output} --stream-count={number_of_frames_to_capture}

• List all video device's controls and their values:

v4l2-ctl --list-ctrls --device {/path/to/video_device}

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