网络摄像头无法找到播放器：vfw：// 0

Question

我正试着在我的网络摄像头拍照，我刚开始使用JMF我只需要用网络摄像头拍照并将其保存到指定目录我正在使用此代码

import java.awt.Component;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Processor;
import javax.media.protocol.FileTypeDescriptor;
import javax.swing.JFrame;
import javax.swing.JLabel;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author victor
 */
public class WebCam {
public static void main(String[] args) {
// TODO Auto-generated method stu
    otro perro=new otro();
    perro.show();
    perro.proceso();
}
}
class otro extends JFrame{
JLabel Imagen;
otro(){
    Imagen=new JLabel();
    Imagen.setBounds(30,40,20,20);
    add(Imagen);
    setBounds(400,400,400,400);
    setLayout( null ); // use a BorderLayou  
    setTitle("Prueba de Camara Web");
}
public void proceso(){
        Manager.setHint( Manager.LIGHTWEIGHT_RENDERER, true );
    try{
        MediaLocator ml = new MediaLocator("vfw://0");
        Player p = (Player) Manager.createRealizedPlayer(ml);

        Component video = p.getVisualComponent();

        video.setBounds(20,30,600,600);
        if ( video != null ){
            // agragar el video al componente
            add( video);
        }


        p.start();
    }catch(Exception e){
        e.printStackTrace();
    }
}
}

运行上面的代码时，会出现以下异常：

javax.media.NoPlayerException: Cannot find a Player for :vfw://0
at javax.media.Manager.createPlayerForContent(Manager.java:1412)
at javax.media.Manager.createPlayer(Manager.java:417)
at javax.media.Manager.createRealizedPlayer(Manager.java:553)
at otro.proceso(WebCam.java:41)
at WebCam.main(WebCam.java:24)

Answer 1

尝试这个

    package javasewebcam;

    import java.awt.Graphics2D;
    import java.awt.Image;
    import java.awt.image.BufferedImage;
    import java.io.File;

    import javax.imageio.ImageIO;
    import javax.media.Buffer;
    import javax.media.Manager;
    import javax.media.MediaLocator;
    import javax.media.Player;
    import javax.media.control.FrameGrabbingControl;
    import javax.media.format.VideoFormat;
    import javax.media.util.BufferToImage;

    public class CaptureScreenshot
    {
    private static Player player = null;
    private static Image image = null;

    public static void main(String[] args)
    {
        try
        {
            MediaLocator ml = new MediaLocator("vfw://0");
            player = Manager.createRealizedPlayer(ml);
            player.start();
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
            System.exit(0);
        }

        while (image == null)
        {
            FrameGrabbingControl fgc = (FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl");
            Buffer buf = fgc.grabFrame();

            BufferToImage bi = new BufferToImage((VideoFormat) buf.getFormat());
            image = bi.createImage(buf);

                        System.out.println("image"+image);
                        if(image!=null)
                        //(toBufferedImage(image));
//save image in here 
                        image=null;
                        System.out.println("streaming");
        }

        try
        {
            ImageIO.write(toBufferedImage(image), "png", new File("screenshot.png"));
            System.out.println("Image Saved!");
        }
        catch (Exception ex)
        {
            ex.printStackTrace();
            System.exit(0);
        }

        player.close();
        player.deallocate();
    }


    public static BufferedImage toBufferedImage(Image i)
    {
        BufferedImage bi = new BufferedImage(i.getWidth(null), i.getHeight(null), BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = bi.createGraphics();
        g2d.drawImage(i, 0, 0, null);

        return bi;
    }

    }