Code generated using Simulink support package for RPi can't open v4l2 camera

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Muhammad Bilal 2022-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/1720495-code-generated-using-simulink-support-package-for-rpi-can-t-open-v4l2-camera

评论： Prasanth Sunkara 2022-5-17

My RPi has two usb cameras at /dev/video0 and /dev/video2. I am using this device (https://www.amazon.com/ELP-Camera-2Megapixel-Android-Windows/dp/B078TGFZ22).

The code generated using Simulink can only open the one at "/dev/video0" and give the error for video2 saying "specified resolution [320 240] not supported".

I have written another code in matlab to test and interestingly that works.

rpi = raspi('192.168.4.100','pi','123')

webcamlist(rpi)

cam1 = webcam(rpi,1); %Opens and shows captured frames

cam2 = webcam(rpi,2); %Opens and shows captured frames

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Prasanth Sunkara 2022-5-17

A quick check would be to know the resolution webcam function used. I guess it took a default value of 320x240.You can get this by executing cam1 (or cam2) variable on MATLAB without a semicolon. Eg: >>cam1

If possible use the raspberry pi resource monitor app to confirm the device id value(/dev/video2) and retry the Simulink model by changing the camera resolution to a different value.

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