v4l-utils

• 安装

sudo apt-get install v4l-utils

1. 列出设备

v4l2-ctl --list-devices

2. 列出设备支持的格式

v4l2-ctl -d /dev/video1 --list-formats-ext 

3. List supported video formats and resolutions of a specific video device:

# v4l2-ctl --list-formats-ext --device path/to/video_device

4. Get all details of a video device:

# v4l2-ctl --all --device path/to/video_device

5. 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

6. 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

7. List all video device’s controls and their values:

# v4l2-ctl --list-ctrls --device /path/to/video_device