OpenCV main loop

opencv_loop.py

"""
Module for video processing using opencv
"""
import time
import argparse

import numpy as np
import pandas as pd
import cv2

PARSER = argparse.ArgumentParser()
PARSER.add_argument("source", help="The file with the source video")
ARGS = PARSER.parse_args()

def main():
    """
    Main loop 
    """
    cap = cv2.VideoCapture(ARGS.source)

    start_time = time.time()
    # Read until video is completed
    while cap.isOpened():
    # Capture frame-by-frame
        ret, frame = cap.read()
        if ret:
            # Display the resulting frame
            cv2.imshow('Frame', frame)

            # Press Q on keyboard to  exit
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break

        # Break the loop
        else:
            break

    # When everything done, release the video capture object
    cap.release()

    # Closes all the frames
    cv2.destroyAllWindows()
    print('Elapsed time:', time.time() - start_time)

main()

Credits to https://www.learnopencv.com/read-write-and-display-a-video-using-opencv-cpp-python/
I have only added argparse to be able to pass different test videos from console