# use CV2 to compile the frames into a 60 fps video.
        images = [img for img in sorted(os.listdir('/home/steven/tmp')) if img.endswith('.png')]
        frame = cv2.imread(os.path.join('/home/steven/tmp',images[0]))
        height, width, layers = frame.shape
        video = cv2.VideoWriter(f"/home/steven/Videos/{datetime.fromtimestamp(start).strftime('%Y-%m-%d_%H-%M-%S')} - {datetime.fromtimestamp(end).strftime('%Y-%m-%d_%H-%M-%S')}.mp4", cv2.VideoWriter_fourcc(*'avc1'), 60, (width, height))
        for image in images:
            video.write(cv2.imread(os.path.join('/home/steven/tmp',image)))
        cv2.destroyAllWindows()
        video.release()