Can you give a tutorial for opencv-live-video-stream-over-http?

[pradeepm1610]

Can you give a tutorial for opencv-live-video-stream-over-http?

Because , I did not know to run this project.

help me !!!

[Mesut Pişkin]

Of course, I will update the read me document

[pradeepsimba]

Help!!!

[Mesut Pişkin]

1. Update your opencv dll reference as readme file.
2. You can open this project with an any java IDE (IntelliJ IDEA, NetBeans or Eclipse, etc.)
3. Run this OpenCVCameraStream.java

[pradeepsimba]

How to increase the size of the webcam view ?

[Mesut Pişkin]

@PradeepSimba PradeepSimba The browser loading the page for a long time because streaming continues all the time.

If you want a resize an image then should use the video capture options.
Ex:

VideoCapture videoDevice = new VideoCapture(0);
videoDevice.set(propId, value);

for size
videoDevice.set(Videoio.CV_CAP_PROP_FRAME_WIDTH, 1024);

or resizer

Mat src  =  imread("imageName.jpg");
Mat resizeimage = new Mat();
Size scaleSize = new Size(300,200);
resize(src, resizeimage, scaleSize , 0, 0, INTER_AREA);

[Mesut Pişkin]

Omg, really "imageName.jpg", imageName.jpg your file image patg

...
if (!videoCapture.read(frame)) {
tmrVideoProcess.stop();
}
//procesed image
//Pls resize frame object, frame is your mat image
httpStreamService.imag = frame;
...

[pradeepsimba]

I done this . But , an error occurs .

`import org.opencv.core.;
import org.opencv.videoio.VideoCapture;
import javax.swing.;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import static org.opencv.imgcodecs.Imgcodecs.imread;
import static org.opencv.imgproc.Imgproc.INTER_AREA;
import static org.opencv.imgproc.Imgproc.resize;

public class OpenCVCameraStream {

//region Properties
public static Mat frame = null;
private static HttpStreamServer httpStreamService;
static VideoCapture videoCapture;
static Timer tmrVideoProcess;
//endregion

//region Methods

public static void start() {


    videoCapture = new VideoCapture();
    videoCapture.open(0);
    if (!videoCapture.isOpened()) {
        return;
    }

    frame = new Mat();
    httpStreamService = new HttpStreamServer(frame);
    new Thread(httpStreamService).start();

    tmrVideoProcess = new Timer(100, new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            if (!videoCapture.read(frame)) {
                tmrVideoProcess.stop();
            }

            //procesed image
            Mat src  = frame ;
            Mat resizeimage = new Mat();
            Size scaleSize = new Size(500,500);
            resize(src, resizeimage, scaleSize , 0, 0, INTER_AREA);
            httpStreamService.imag = frame;



        }
    });
    tmrVideoProcess.start();
}

public static void main(String[] args) {
    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);//Load opencv native library
    start();
}

//endregion

}
`

Error :
C:\Users\prade\.jdks\openjdk-14\bin\java.exe "-Djava.library.path=D:\install\open cv 3.1\opencv\build\java\x64;D:\install\open cv 3.1\opencv\build\java\x86" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.1.1\lib\idea_rt.jar=53901:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.1.1\bin" -Dfile.encoding=UTF-8 -classpath "D:\Github\opencv-live-video-stream-over-http\out\production\opencv-live-video-stream-over-http;D:\install\open cv 3.1\opencv\build\java\opencv-310.jar" OpenCVCameraStream go to http://localhost:8080 with browserOpenCV Error: Unknown error code -10 (Raw image encoder error: Empty JPEG image (DNL not supported)) in cv::BaseImageEncoder::throwOnEror, file C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\imgcodecs\src\grfmt_base.cpp, line 139 OpenCV Error: Unknown error code -10 (Raw image encoder error: Empty JPEG image (DNL not supported)) in cv::BaseImageEncoder::throwOnEror, file C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\imgcodecs\src\grfmt_base.cpp, line 139