How to Change the videocapture property in opencv c++?

asked 2020-07-24 09:33:37 -0600

I have been trying to set the camera reading pixel size to different than what by default camera resolution is. However, I am not able to set the pixel size using

videoStream.set(cv::CAP_PROP_FRAME_WIDTH, frameWidth);
videoStream.set(cv::CAP_PROP_FRAME_HEIGHT, frameHeight);

Can someone help me out with the reasons for this?

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answered 2020-07-24 10:08:18 -0600

berak
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sadly, none of the VideoCapture::set() or get() settings are guaranteed to work, it depends on your hardware, drivers, os, opencv video backend even.

most webcams only support certain sizes, e.g. multiples of vga or pal resolution, not arbitrary numbers.

in any case, please check the return value from videoStream.set() for failure.