OpenCv error can't open camera through video capture

Question

I was using my cam through opencv and suddenly after restarting I ran my code it shows below error:

[ WARN:0] global /io/opencv/modules/videoio/src/cap_v4l.c         


        

Answer 1

I got the same error. Try changing 0 to -1

cap = cv2.VideoCapture(-1)

This solved the issue.