Linux command
v4l2loopback-ctl 命令
安全
权限或系统影响较大，执行前请核对目标。
常用示例
Create a new loopback device
sudo v4l2loopback-ctl add -n "[My Virtual Camera]"
List all
v4l2loopback-ctl list
Delete
sudo v4l2loopback-ctl delete /dev/video[0]
Query
v4l2loopback-ctl query /dev/video[0]
Set the frame rate
v4l2loopback-ctl set-fps /dev/video[0] [30]
Set the format capabilities
v4l2loopback-ctl set-caps /dev/video[0] "[UYVY:1024x768@30/1]"
Set a timeout image
v4l2loopback-ctl set-timeout-image -t [3000] /dev/video[0] [path/to/image.png]
说明
v4l2loopback-ctl is a utility for managing virtual video loopback devices created by the v4l2loopback kernel module. These virtual devices act as pipes: one application feeds video frames into the device (producer), and another application reads them (consumer), enabling use cases like virtual webcams, screen sharing to video conferencing tools, and video processing pipelines. The tool uses a verb-based interface with commands for creating, deleting, listing, and querying loopback devices, as well as configuring their frame rate, format capabilities, and fallback timeout images.
参数
- -h, -?, --help
- Display help information and exit.
- -v, --version
- Show version and exit.
FAQ
What is the v4l2loopback-ctl command used for?
v4l2loopback-ctl is a utility for managing virtual video loopback devices created by the v4l2loopback kernel module. These virtual devices act as pipes: one application feeds video frames into the device (producer), and another application reads them (consumer), enabling use cases like virtual webcams, screen sharing to video conferencing tools, and video processing pipelines. The tool uses a verb-based interface with commands for creating, deleting, listing, and querying loopback devices, as well as configuring their frame rate, format capabilities, and fallback timeout images.
How do I run a basic v4l2loopback-ctl example?
Run `sudo v4l2loopback-ctl add -n "[My Virtual Camera]"` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -h, -?, --help do in v4l2loopback-ctl?
Display help information and exit.