cv :: VideoCapture适用于网络摄像头，但不适用于IP摄像机? [英] cv::VideoCapture works for webcams but not IP cameras?

问题描述

这是必须发生的，当我想使用自己的代码时，我陷入了项目的最后阶段，就像在网络摄像头，IP摄像机上一样，它的工作原理很迷人.该URL在我的浏览器中可以正常运行，但是OpenCV没有任何显示... 这是我的代码:

It had to happen, I'm stuck in the last phase of my project, when I want to use my code which works like a charm on my webcam, on an IP camera. The URL works perfectly in my browser, but nothing comes out with OpenCV... Here is my code:

#include <opencv/highgui.h>

using namespace cv;

int main(int argc, char *argv[])
{
    Mat frame;
    namedWindow("video", 1);
    VideoCapture cap("http://192.168.1.99:99/videostream.cgi?resolution=32&rate=0&user=admin&pwd=password&.mjpg");
    while ( cap.isOpened() )
    {
        cap >> frame;
        if(frame.empty()) break;

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

    return 0;
}

以及编译器设置:

//Added to the .pro file of QtCreator
INCLUDEPATH += C:\\OpenCV243\\release\\include
LIBS += -LC:\\OpenCV243\\release\\lib \
    -lopencv_core243.dll \
    -lopencv_highgui243.dll

我已经测试过使用相同的代码打开.avi文件，并且可以正常工作...但是像http://66.184.211.231/mjpg/video.mjpg这样的公共IP摄像机URL却不起作用！那怎么了?

I've tested opening a .avi file with the same code and it works... But a public IP camera URL like http://66.184.211.231/mjpg/video.mjpg doesn't ! What's the matter then ?

已被编辑删除:我认为FFMPEG是一个问题，但v2.4.3.具有内置的FFMPEG支持和.avi文件，尽管我没有安装任何FFMPEG库(请解释一下?)

Removed by edit: I had considered FFMPEG to be an issue, but v2.4.3. has built-in FFMPEG support and .avi files work although I don't have any FFMPEG library installed (care to explain?)

预先感谢

关于， 米斯特尔先生

推荐答案

通过从源代码的build \ x86 \ mingw \ bin文件夹中复制opencv_ffmpeg.dll并将其粘贴到已构建的DLL(可通过PATH访问的bin文件夹)旁边来解决此问题):我不知道为什么，但是改为生成了opencv_ffmpeg_64.dll.

Solved it by copying opencv_ffmpeg.dll from the build\x86\mingw\bin folder of the sources and pasting it next to built DLLs (bin folder accessible through PATH): I have no idea why, but the opencv_ffmpeg_64.dll had been produced instead.

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