如何在OpenCV2 Python中查看视频流 [英] How to view video stream in OpenCV2 python

问题描述

我开始玩Opencv.我在Linux上使用opencv2的python绑定.我编写了一个快速测试程序，但它似乎无限期挂起.

I'm starting to play with Opencv. I am using the python bindings for opencv2 on Linux. I wrote a quick test program but it seems to hang indefinitely.

import cv2

weblink = "http://continuous-video-stream-here"
cv2.namedWindow("video")

vid = cv2.VideoCapture(weblink)
key = -1

while (key < 0):
    success, img = vid.read()
    cv2.imshow("video", img)

但是它挂在此输出上:

(video:14388): GStreamer-CRITICAL **: gst_caps_unref: assertion `caps != NULL' failed

我也尝试过从urllib2中读取内容:

I have also tried reading from urllib2:

vid = cv2.VideoCapture(urllib2.urlopen(weblink).read())

但是那也不起作用.

我正在使用Opencv 2.4.2，ffmpeg-0.11.2

I am using Opencv 2.4.2, ffmpeg-0.11.2

EDIT :视频供稿使用Realplayer在浏览器中的http上显示视频.

EDIT: The video feed uses realplayer to display the video over http in the browser.

推荐答案

安全编码并测试方法的返回:

Code safely and test the return of the method:

vid = cv2.VideoCapture(weblink)
if not vid:
    print("!!! Failed VideoCapture: invalid parameter!")

您使用的地址可能不受OpenCV的支持.

The address you are using is probably not supported by OpenCV.

只要方法可能失败，都应使用相同的做法:

The same practice should be used whenever a method can fail:

while (key < 0):
    success, img = vid.read()
    if not img:
        print("!!! Failed vid.read()")
        break

    cv2.imshow("video", img)

这篇关于如何在OpenCV2 Python中查看视频流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！