[Allwinner heterogeneous multi-core AI intelligent vision V853 development board evaluation] v4l2-ctl camera control

dql2016

[Allwinner heterogeneous multi-core AI intelligent vision V853 development board evaluation] v4l2-ctl camera control [Copy link]

 

V4L2 is the abbreviation of Video for Linux2, which is the kernel driver for video devices in Linux. In Linux, video devices are device files that can be read and written like ordinary files. The camera is under /dev/video*. If there is only one video device, it is usually /dev/video0. v4l2-ctl is a set of user space tools for testing, configuring and using the entire camera subsystem, including external camera sensors and camera interfaces. v4l2-ctl is the most useful utility.

The basic and commonly used commands of v4l2-ctl are as follows:

Use the --list-devices option to list all available video devices.

v4l2-ctl --list-devices

To get information about a specific device, add the -D option:

v4l2-ctl -d /dev/video0 -D

Get the list of supported parameter setting interfaces

v4l2-ctl -L -d /dev/video0

The control value can be changed by using the --set-ctrl option, such as:

v4l2-ctl --set-ctrl test_pattern=1

Control values can be changed dynamically.

Set the pixel format, resolution and frame rate. Use the --list-formats-ext option to get the supported pixel formats, resolutions and frame rates:

View the video compression formats supported by the current camera

v4l2-ctl -d /dev/video0 --list-formats

View all camera parameters

v4l2-ctl -d  /dev/video0 --all

Check the resolutions supported by the camera

v4l2-ctl --list-framesizes=MJPG -d /dev/video0

lugl4313820

The example introduced by the master is very useful. I am just trying to make an example of web viewing. Please give me some advice!

dql2016

lugl4313820 posted on 2022-12-1 17:52 The big brother introduced this and it is very useful. I am just trying to make an example of web viewing. Please give me more advice!