How can you “encode” frames from an opencv video to compare them later

If you have a signal source (Capture - camera, video file, internet broadcast), then the next frame is obtained from the video stream using read

cap = cv2.VideoCapture(0) while True: # Capture frame-by-frame ret, frame = cap.read() 

We need these frames for further use - store as much as is required, for example, in the list.