OpenCV Python: cv2.VideoCapture can only find 2 of 3 cameras, Windows Camera app finds all

Question

I\'m trying to create 3 real-time capture frames with webcams into a USB hub into my laptop. Using the \"camera\" app on Windows, I can change the camera source one at a time an

Answer 1

having two video input devices does not automatically mean that their IDs are 0 and 10. Try to access the all cameras by increasing to about 500 or more instead of 10

cams_test = 500
for i in range(0, cams_test):
    cap = cv2.VideoCapture(i)
    test, frame = cap.read()
    if test:
        print("i : "+str(i)+" /// result: "+str(test))

I think you are only testing