sudo apt update sudo apt install -y build-essential cmake git clone https://github.com/pmliquify/v4l2-test.git ./v4l2-test/make.sh
You can find the executable in the build* directory.
sudo apt update sudo apt install -y binutils-aarch64-linux-gnu g++-aarch64-linux-gnu cmake git clone https://github.com/pmliquify/v4l2-test.git ./v4l2-test/make.sh --cross
For NXP plattforms it is necessary to set the image resolution by v4l2-ctl before you start using v4l2-test.
v4l2-ctl --set-fmt-video=width=<width>,height=<height>
$ ./v4l2-test stream -e <exposure> -g <gain> -f <pixelformat> -p 1 Format (width: 1920, height: 1080, pixelformat: RG10, colorspace: SRGB) [#0001, ts: 252432, t: 0 ms, 1920, 1080, 3840, RG10] (960, 540) 0000001111110010 0000001111101111 0000001111111111 [#0002, ts: 252449, t: 17 ms, 1920, 1080, 3840, RG10] (960, 540) 0000001111100101 0000001101110001 0000001110111011 [#0003, ts: 252465, t: 16 ms, 1920, 1080, 3840, RG10] (960, 540) 0000001111111111 0000001111111111 0000001110011010 ...
Each image is represented by one line.
+ image width
| + image height
| | + bytes per line
| | | + pixelformat
| | | |
v v v v
[#0002, ts: 252449, t: 17 ms, 1920, 1080, 3840, RG10] <image data>
^ ^ ^
| | |
| | + time between two consecutive images
| + time stamp
+ sequence number
If you have a display attached and a kernel with framebuffer support, you can get a better image output by streaming it to the framebuffer.
$ ./v4l2-test stream --fb Format (width: 1920, height: 1080, pixelformat: RG10, colorspace: SRGB) >>>>>>>>>>>>>>>>>>>>>>>>>>
Use the -p to additionaly print out one line if image information to the console.