OpenCV无法连接到视频流-缺少某些编解码器？

Question

I use application IPCamera on my mobile phone with Android to output (share) video image from it's camera to LAN. I can access it on PC browser - that is ok.

However, I want to make OpenCV capture this video stream from IP address by typing

VideoCapture cap("http://admin:admin@192.168.0.11:8081/?action=stream?dummy=param.mjpg");
 while( cap.isOpened() )
 {
    Mat frame;
    if ( ! cap.read(frame) )
        break;

    cout << "Connected!!";

    imshow("lalala",frame);
    int k = waitKey(10);
    if ( k==27 )
        break;
}

and i got error:

Actual codec, which is used by phone is mjpeg (i read it from application on my mobile). I don't know if OpenCV supports this, but is that about mobile application uses some kind of unique codec, or my PC lacks it, or maybe C++/OpenCV code is wrong?

Answer 1

On PC opencv can capture your video stream from your mobile prone.. Like. You are using right connection string, like this for rtsp stream in my case.

VideoCapture capture("rtsp://USER:PASS@xxx.xxx.xxx.xxx/axis-media/media.amp?camera=2");

Probably, You don't have FFMPEG instaled corectly. You need to reinstall Opencv. First you need to install FFMPEG and Opencv After that. In opencv 3.0.0 and 3.1 try to add

#include <opencv2\videoio.hpp>
#include <opencv2\imgcodecs.hpp>

Some tips how to install ffmpeg and sample in C++ on linux debian Here Code and tips and tricks