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I'm trying to use python to capture a photo from my ip cameras every 1 minute and save it as a file for later use. I'm still not good at python and I don't get why some of the times I get the right image and sometimes I get a corrupted gray image. I'm using hikvision api to get the rtsp stream and while the stream is working sometimes the images are still fully gray. Here is the code I wrote:

import cv2
import time

count = 0
while True:
    for x in range(1, 9):
        count = count +1
        RTSP_URL = f'rtsp://user:password@ip:port/ISAPI/Streaming/Channels/{x}01'
        cap = cv2.VideoCapture(RTSP_URL, cv2.CAP_FFMPEG)
        result, image = cap.read()
        if result:
            cv2.imwrite(f"pictures/{x}{count}.png", image)
        time.sleep(60)

I would be happy to hear suggestions to find the best way to do this task.

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  • Are you getting corrupted images if you remove time.sleep(60)? For testing, you may add cv2.imshow('image', image) and cv2.waitKey(1) for showing the video. Commented Aug 1, 2022 at 16:51
  • @Rotem thanks for commenting, after changing that it still shows the gray images and sometimes working images. what's interesting is that when I try to make it a substream(a lower quality option offered by the API) it works without corrupted images. Commented Aug 1, 2022 at 17:15
  • No I see... you are reading from 8 different streams. Try adding cap.release() after result, image = cap.read(). That way you are going to close and reopen the connection every minute. I don't think we can use new cap = cv2.VideoCapture without executing cap.release(). In case you want to hold 8 RTSP connections open, use a list of 8 cap objects. Open the 8 cap objects before the while True, and use cap[x-1].read(). Make sure that the CPU load is not too high. Commented Aug 1, 2022 at 20:03
  • @Rotem thanks again for helping me! After trying both ideas It looks like the situation doesn't change. Perhaps it's the problem with the API? Here is a link for the corrupted image I get imgur.com/pmZloii Commented Aug 2, 2022 at 8:49
  • try this github.com/Cacsjep/pyrtsputils/blob/main/snapshot_generator.py Commented Sep 13, 2022 at 11:23
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