Using webcam with opencv python shows a black screen w/waitkey()

Question

I\'m trying to access a basic webcam (Logitech c270) through opencv python VideoCapture. Unfortunately though, every time I run the program the display screen comes up black. I

Answer 1

You should add a safety check after that loop to make sure it found something.

Right now it seems that the code is still executing even when nothing was found:

import sys
import cv2
i = 0
found = False
for i in range(4):
        capture = cv2.VideoCapture(i)
        if not capture:
            print "UNABLE TO CAPTURE CAMERA"
        else:
            found = True
            print "taken camera from index: ", i
            break

if found == False:
    print "!!! No camera was found."
    sys.exit()