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cv2.VideoCapture(0).isOpened() return always false

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Some information on my configuration : **windows 10** **python 3.7.3** **openCV 4.1.0** (get with the command : cv2.__version__) My problem is that the following code **return me False all time**, so i think that the program can't find my integrated camera( i have a laptop). But i don't know, so the problem may come from everywhere... import cv2 cap = cv2.VideoCapture(0) print( cap.isOpened() ) I think that i have a good installation of opencv and python because i can open a video with the following code : cv2.VideoCapture('video.avi') So i don't know how to solve my problem, thanks for help and sorry for my english.

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