如何在python中使用opencv访问来自网络摄像机的视频流？

Question

Right now I am using a web cam and it works perfectly fine with the code below -:

capture = cv2.VideoCapture(0)

Now instead of web cam, I want to use the ip camera( https://192.168.0.60 ) What would be the easiest way to do it with OpenCV(Python)?

I saw a bunch of posts, but couldn't find a straight answer to this. Can someone help, who already got it running?

Thank you!

Answer 1

Firstly, you must find the exact url for your video stream, and that's best done with a web browser. For example I use IP Webcam app on android (com.pass.webcam) and it's stream will be on:

http://phone-ip-address:port/video

If I visit that url with a web browser, I can see the live stream. Make sure, that what you see is only the video stream, not a html page with the stream. If there is a html page, you can right-click and select Open image in new tab (in Chrome) to get to the stream.

However it looks like OpenCV can only read the video stream if the filename/url has the right suffix. Adding ?type=some.mjpeg worked for me. So the url would be:

http://phone-ip-address:port/video?type=some.mjpeg

Try visiting such an url in the web browser before you go for opencv.

Answer 2

Take a look at this example with python , OpenCV , IPCAM and hikvision

import numpy as np 
import cv2

cap = cv2.VideoCapture() 
cap.open("rtsp://USER:PASS@IP:PORT/Streaming/Channels/2")

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

    # Our operations on the frame come here
    #gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    cv2.imshow('Salida',frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture 
cap.release()
cv2.destroyAllWindows()

Image: Get video from IPCAM with python and OpenCV

Answer 3

Here you go,

import numpy as np
import cv2

cap = cv2.VideoCapture('rtsp://<username_of_camera>:<password_of_camera@<ip_address_of_camera')

while(True):

    ret, frame = cap.read()
    cv2.imshow('Stream IP Camera OpenCV',frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

For example:

import numpy as np
import cv2

cap = cv2.VideoCapture('rtsp://admin:admin@192.168.0.60')

while(True):

    ret, frame = cap.read()
    cv2.imshow('Stream IP camera opencv',frame)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

Then save the file as camera.py (.py), go to command prompt or terminal, locate file and type python camera.py or python <file_name>.py enter to run script.
If you want to exit from script windows just press "q" or close cmd.

Hope this helpful.

Answer 4

Here is an example for a Vivotek IP8136W IP Camera. It does not support streaming.

This code continuously grabs still frames, at about 2fps. No observed CPU loading.

import numpy as np
import cv2

# for webcams, request stream only once.
#cap = cv2.VideoCapture(0)
    
while(True):

    # For single image IP cams, request frame every time.
    cap = cv2.VideoCapture("http://root:0002A78D65F2@192.168.1.38/cgi-bin/viewer/video.jpg")

    ret, frame = cap.read()
   
    # Display the resulting frame
    if ret:
        cv2.imshow('camera',frame)
    else:
        print("error getting frame.")

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# Done. release the capture
cap.release()
cv2.destroyAllWindows()