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36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
# v4l2-ctl
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> Control video devices.
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> More information: <https://manned.org/v4l2-ctl>.
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- List all video devices:
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`v4l2-ctl --list-devices`
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- List supported video formats and resolutions of default video device `/dev/video0`:
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`v4l2-ctl --list-formats-ext`
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- List supported video formats and resolutions of a specific video device:
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`v4l2-ctl --list-formats-ext {{[-d|--device]}} {{path/to/video_device}}`
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- Get all details of a video device:
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`v4l2-ctl --all {{[-d|--device]}} {{path/to/video_device}}`
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- Capture a JPEG photo with a specific resolution from video device:
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`v4l2-ctl {{[-d|--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`
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- Capture a raw video stream from video device:
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`v4l2-ctl {{[-d|--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}}`
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- List all video device's controls and their values:
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`v4l2-ctl {{[-l|--list-ctrls]}} {{[-d|--device]}} {{path/to/video_device}}`
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- Set the value of a video device control:
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`v4l2-ctl {{[-d|--device]}} {{path/to/video_device}} {{[-c|--set-ctrl]}} {{control_name}}={{value}}`
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