how to process with opencv and python a live video transmission from a webrtc site

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I'm trying to process with OpenCV and python a live video transmission from a WebRTC site. But I can't open the video with

cv2.videocapture (URL)

When I try to open the video whith cv2.videocapture, it returns this error: [

ERROR:0] global C:\projects\opencv-python\opencv\modules\videoio\src\cap.cpp (116) cv::VideoCapture::open VIDEOIO(CV_IMAGES): raised OpenCV exception: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\videoio\src\cap_images.cpp:235: error: (-5:Bad argument) CAP_IMAGES: error, expected '0?[1-9][du]'

How could I open the video that is compatible with OpenCV? I appreciate it if you demonstrate the code.

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