使用OpenCV访问IP Camera

Question

下面给出的代码用于使用OpenCV访问Axis IP摄像机.在运行程序时,它首先显示"打开cap_ffmpeg_impl ...时出错",然后显示找不到相机.

#include <opencv\cv.h>
#include <opencv2\highgui\highgui.hpp>
#include <opencv2\imgproc\imgproc.hpp>
#include <iostream>
#include <stdio.h>

using namespace std;
using namespace cv;

int main()
{
    Mat frame;
    namedWindow("video", 1);
    VideoCapture cap("http://IPADDRESS/video.mjpg");
    if(!cap.isOpened())
    {
        cout<<"Camera not found"<<endl;
        getchar();
        return -1;
    }
    while ( cap.isOpened() )
    {
        cap >> frame;
        if(frame.empty()) break;

        imshow("video", frame);
        if(waitKey(30) >= 0) break;
    }   
    return 0;
}

我哪里错了？

Answer 1

当我尝试使用公共IP摄像机显示IP摄像机时,我遇到了类似的问题.Opencv需要一些典型的URL来打开相机.从下面的代码中尝试URL.这是对我有用的代码.

int main(int, char**) {
    cv::VideoCapture vcap;
    cv::Mat image;

    // This works on a D-Link CDS-932L
    const std::string videoStreamAddress = "http://ID:PASSWORD@IPADDRESS:PORTNO/mjpeg.cgi?user=ID&password=ID:PASSWORD&channel=0&.mjpg";
       //open the video stream and make sure it's opened
    if(!vcap.open(videoStreamAddress)) {
        std::cout << "Error opening video stream or file" << std::endl;
        return -1;
    }

    for(;;) {
        if(!vcap.read(image)) {
            std::cout << "No frame" << std::endl;
            cv::waitKey();
        }
        cv::imshow("Output Window", image);

        if(cv::waitKey(1) >= 0) break;
    }   

}

按原样复制此代码并尝试.

#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <iostream>
int main(int, char**) {
    cv::VideoCapture vcap;
    cv::Mat image;

    // This works on a D-Link CDS-932L

    const std::string videoStreamAddress = "http://USER:PWD@IPADDRESS:8088/mjpeg.cgi?user=USERNAME&password=PWD&channel=0&.mjpg";
       //open the video stream and make sure it's opened
    if(!vcap.open(videoStreamAddress)) {
        std::cout << "Error opening video stream or file" << std::endl;
        return -1;
    }

    for(;;) {
        if(!vcap.read(image)) {
            std::cout << "No frame" << std::endl;
            cv::waitKey();
        }
        cv::imshow("Output Window", image);

        if(cv::waitKey(1) >= 0) break;
    }   

}