Opencv VideoCapture File, Web Camera, RTSP stream

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  • Opencv VideoCapture File, Camera and stream

    Opencv tutorial simple code in C++ to capture video from File, Ip camera stream and also the web camera plug into the computer.. The key is to have installed the FFMPEG espetially in case of reading the strem of IP cameras. In windows just use Opencv Installation by Nugets packages Here. Simple easy under 2 minutes instalation. In Linux you need to follow the instruction bellow. If you are on Debian Like package system. Under Fedora Red hat dist just use different aproach. Code is simple and installation is the key.. 

    Windows use nugets packages
    Linux you have to install and build Opencv With FFMPEG. Also simple. 

    It is easy capture video in opencv

    Video capture
     in opencv is really easy task, but for little bit experienced user. 

    What is problem?
    Problem is instalation of Opencv without recommended dependencies.

    Just install all basic libs that is recommended on website.
    # Basic packages
    sudo apt-get -y install build-essential
    sudo apt-get -y install cmake
    sudo apt-get -y install pkg-config
    
    
    # Basic dependencies
    sudo apt-get -y install libgtk2.0-dev python-dev python-numpy
    
    
    # OpenCV dependencies part II.
    sudo apt-get -y install libgstreamer0.10-0-dbg libgstreamer0.10-0 libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev libunicap2 libunicap2-dev libdc1394-22-dev libdc1394-22 libdc1394-utils libv4l-0 libv4l-dev
    
    sudo apt-get -y install libavcodec-dev libavformat-dev libswscale-dev
    
    sudo apt-get -y install libdc1394-22-dev libdc1394-utils
    
    sudo apt-get -y install libjpeg-dev libpng-dev libtiff-dev libjasper-dev
    
    sudo apt-get -y install libtiff5 libtiff5-dev
    sudo apt-get -y install libopenexr-dev
    sudo apt-get -y install libjasper-dev
    # Algebra
    sudo apt-get -y install libeigen3-dev

    Install ffmpeg .

    You need to download and build by own in case of Debian Jessie or some version of Ubuntu.
    Just download, extract tar archive ffmpeg.tar.bz2.

    1 configure instalation ./configure -- with Right Params.

    2 Make - make -j4

    3 install - make install

    4 write config ldconfig -v



    Compile opencv

    Check this table during the opencv instalation. if you have FFMPEG and all AV libs 
    AVCODEC AVFORMAT AVUTIL AVSWSCALE you can continue with opencv installation.
    opencv config ffmpef
    Opencv config

    Read video file in Opencv

    VideoCapture capture("input.mp4");

    Read rtsp stream in Opencv

    VideoCapture capture("rtsp://USER:PASS@xxx.xxx.xxx.xxx/axis-media/media.amp?camera=2");
    Some of my next post will be about rtsp stream format. PLS subscribe.

    Read web camera in Opencv

    VideoCapture capture(0);

    Opencv 3 and higher c++ code







    
    
    #include 
    #include 
    #include 
    
    using namespace std;
    using namespace cv;
    
    //Chose input
    
    //VideoCapture capture(0);
    VideoCapture capture("rtsp://USER:PASS@xxx.xxx.xxx.xxx/axis-media/media.amp?camera=2");
    //VideoCapture capture("input.mp4");
    
    
    // create mat to fill by external source
    Mat frame;
    
    for(;;)
    
    {
           bool OK = capture.grab();
    
            if (OK == false){
            cout << "cannot grab" << endl;
            }
            else{
              // retrieve a frame of your source
               capture.read(frame);
              //OR
             // capture >> frame;
           }
    }
    
    
    

    3 comments:

    1. Hi

      I can read the rtsp stream using opencv 3.1 (compiled with ffmpeg) in python. But after some time I start getting corrupted frames and after further time I get error while reading the frames. Have you encountered it? If it works fine for you maybe I should use the versions you are using.

      ReplyDelete
    2. Problem is instalation of Opencv without recommended dependencies.web design tutorials

      ReplyDelete
    3. Video capture
      in opencv is really easy task, but for little bit experienced user.



      โกลเด้นสล็อต



      goldenslot

      ReplyDelete

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