mirror of https://github.com/CrimsonTome/tldr.git
33 lines
1.1 KiB
Markdown
33 lines
1.1 KiB
Markdown
# 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}}`
|