open video file with opencv java

Question

so there is OpenCV for Java now...! Can anyone tell me how to open Videofiles with it ?

I tryed and look all over the internet, but found nothing. The documentation

Answer 1

If you are using the new version of Java, this is how I got it to work.

import org.opencv.core.*;
import org.opencv.videoio.*;

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;

import javax.swing.*;public class MainStruct {

public class MainStruct {

static { 
    try {
    System.load("C:opencv\\build\\x64\\vc14\\bin\\opencv_ffmpeg320_64.dll");
    } catch (UnsatisfiedLinkError e) {
        System.err.println("Native code library failed to load.\n" + e);
        System.exit(1);
    }
}

public static void main(String[] args)
{
    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

    //Create new MAT object
    Mat frame = new Mat();

    //Create new VideoCapture object
    VideoCapture camera = new VideoCapture("C:\\**VideoFileLocation**");

    //Create new JFrame object
    JFrame jframe = new JFrame("Video Title);

    //Inform jframe what to do in the event that you close the program
    jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Create a new JLabel object vidpanel
    JLabel vidPanel = new JLabel();

    //assign vidPanel to jframe
    jframe.setContentPane(vidPanel);

    //set frame size
    jframe.setSize(2000, 4000);

    //make jframe visible
    jframe.setVisible(true);

    while (true) {
        //If next video frame is available
        if (camera.read(frame)) {
            //Create new image icon object and convert Mat to Buffered Image
            ImageIcon image = new ImageIcon(Mat2BufferedImage(frame));
            //Update the image in the vidPanel
            vidPanel.setIcon(image);
            //Update the vidPanel in the JFrame
            vidPanel.repaint();

        }
    }
}

public static BufferedImage Mat2BufferedImage(Mat m) {
    //Method converts a Mat to a Buffered Image
    int type = BufferedImage.TYPE_BYTE_GRAY;
     if ( m.channels() > 1 ) {
         type = BufferedImage.TYPE_3BYTE_BGR;
     }
     int bufferSize = m.channels()*m.cols()*m.rows();
     byte [] b = new byte[bufferSize];
     m.get(0,0,b); // get all the pixels
     BufferedImage image = new BufferedImage(m.cols(),m.rows(), type);
     final byte[] targetPixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
     System.arraycopy(b, 0, targetPixels, 0, b.length);  
     return image;
    }

}