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OpenCV not playing video using cv2

user757 Published in July 17, 2018, 7:53 am

I am trying to load a video from my hard drive convert the video into grayscale and then play the video using opencv with python 2.7. My code is as below

import numpy as np
import cv2


while (cap.isOpened()):
 ret, frame = cap.read()

 gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

 if cv2.waitKey(25) & 0xFF == ord('q'):


Absolutley nothing happens at all when I run the file, I get zero errors but nothing pops up. Does anybody have any ideas on what I can do? I am following this tutorial https://docs.opencv.org/3.1.0/dd/d43/tutorial_py_video_display.html

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