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OpenCV Imgproc.FindContours() returns 0 contours

I'm trying to find contours on the stream from camera using OpenCv. So far I had no success. I tried with Canny() and with Threshold() approach but in both cases FindContours() returned 0 contours.

I searched everywhere if someone had similar issue, but none of described solutions worked for me.

Does anyone knows what could be an issue. If required I can attach code later, but I doubt that it could reveal something, but if required, I'll do anything to get some help.

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