如何通过OpenCV和python打开IP Camera Url?

问题描述

我已经在具有ffmpeg支持的MacX(Lion)上安装了opencv

I have install opencv on MacX(Lion) with ffmpeg support

import cv2
import cv
import base64
import time
import urllib2
import numpy as np

from cv2 import __version__

print(__version__)
video="http://xxx.223.91.91/mjpg/1/video.mjpg?dummy=param.avi"
vv = cv.CaptureFromFile(video)
cv2.namedWindow("preview")
vc = cv2.VideoCapture("http://xxx.223.91.91/mjpg/1/video.mjpg?dummy=param.mjpg")

但显示警告

2.4.2

警告:无法读取电影文件 http://xxx.223.91.91/mjpg/1/video.mjpg?dummy = param.avi

WARNING: Couldn't read movie file http://xxx.223.91.91/mjpg/1/video.mjpg?dummy=param.avi

警告:无法读取电影文件 http://xxx.223.91.91/mjpg/1/video.mjpg?dummy = param.mjpg

WARNING: Couldn't read movie file http://xxx.223.91.91/mjpg/1/video.mjpg?dummy=param.mjpg

我用Google编写了很多代码，但是找不到解决该问题的方法.请帮助我，谢谢.

I Google a lot of code, but could not find a solution to the problem.Please help me, thank you.

推荐答案

import cv2
import urllib 
import numpy as np

stream=urllib.urlopen('http://localhost:8080/frame.mjpg')
bytes=''
while True:
    bytes+=stream.read(16384)
    a = bytes.find('\xff\xd8')
    b = bytes.find('\xff\xd9')
    if a!=-1 and b!=-1:
        jpg = bytes[a:b+2]
        bytes= bytes[b+2:]
        i = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8),cv2.CV_LOAD_IMAGE_COLOR)
        cv2.imshow('i',i)
        if cv2.waitKey(1) ==27:
            exit(0)    

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