tldr/pages/linux/v4l2-ctl.md

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# v4l2-ctl
> Control video devices.
> More information: <https://manned.org/v4l2-ctl>.
- 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 specific 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}}`