Here is the source code to JMF Webcam app + saves jpeg

Question

Since so many people ask for this code, but never get it, I figured I'd repost it. I didn't write it, but I added the jpeg saving part, and modified it for my device, which you will have to do to get it to work. Just go into JMFRegistry and get the device name from your webcam and then edit the code. Also, keep in mind that some webcams don't work with JMF. You have to have a webcam that supports VFW or WDM interface.
And here's the code:
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.media.control.*;
import javax.media.protocol.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
public class SwingCapture extends Panel implements ActionListener
  public static Player player = null;
  public CaptureDeviceInfo di = null;
  public MediaLocator ml = null;
  public JButton capture = null;
  public Buffer buf = null;
  public Image img = null;
  public VideoFormat vf = null;
  public BufferToImage btoi = null;
  public ImagePanel imgpanel = null;
  public SwingCapture()
    setLayout(new BorderLayout());
    setSize(320,550);
    imgpanel = new ImagePanel();
    capture = new JButton("Capture");
    capture.addActionListener(this);
    String str1 = "vfw:Logitech USB Video Camera:0";
    String str2 = "vfw:Microsoft WDM Image Capture (Win32):0";
    di = CaptureDeviceManager.getDevice(str2);
    ml = di.getLocator();
    try
      player = Manager.createRealizedPlayer(ml);
      player.start();
      Component comp;
      if ((comp = player.getVisualComponent()) != null)
        add(comp,BorderLayout.NORTH);
      add(capture,BorderLayout.CENTER);
      add(imgpanel,BorderLayout.SOUTH);
    catch (Exception e)
      e.printStackTrace();
  public static void main(String[] args)
    Frame f = new Frame("SwingCapture");
    SwingCapture cf = new SwingCapture();
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
      playerclose();
      System.exit(0);}});
    f.add("Center",cf);
    f.pack();
    f.setSize(new Dimension(320,550));
    f.setVisible(true);
  public static void playerclose()
    player.close();
    player.deallocate();
  public void actionPerformed(ActionEvent e)
    JComponent c = (JComponent) e.getSource();
    if (c == capture)
      // Grab a frame
      FrameGrabbingControl fgc = (FrameGrabbingControl)
      player.getControl("javax.media.control.FrameGrabbingControl");
      buf = fgc.grabFrame();
      // Convert it to an image
      btoi = new BufferToImage((VideoFormat)buf.getFormat());
      img = btoi.createImage(buf);
      // show the image
      imgpanel.setImage(img);
      // save image
      saveJPG(img,"c:\\test.jpg");
  class ImagePanel extends Panel
    public Image myimg = null;
    public ImagePanel()
      setLayout(null);
      setSize(320,240);
    public void setImage(Image img)
      this.myimg = img;
      repaint();
    public void paint(Graphics g)
      if (myimg != null)
        g.drawImage(myimg, 0, 0, this);
  public static void saveJPG(Image img, String s)
    BufferedImage bi = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = bi.createGraphics();
    g2.drawImage(img, null, null);
    FileOutputStream out = null;
    try
      out = new FileOutputStream(s);
    catch (java.io.FileNotFoundException io)
      System.out.println("File Not Found");
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
    JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
    param.setQuality(0.5f,false);
    encoder.setJPEGEncodeParam(param);
    try
      encoder.encode(bi);
      out.close();
    catch (java.io.IOException io)
      System.out.println("IOException");

Answer 1

Hi William,
I've tried this code but I always get an null fgc with the following line.
FrameGrabbingControl fgc = (FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingCotrol");
So the player returns always null. The other thigns seem to be fine. I can view the image in the application but when I click capture it throws a Null Pointer Exception because fgc is null.
I am using Logitech QuickCam, USB, Win2k, jdk 1.3.1, JMF 2.1.1
Can you help me?
thanx,
Philip
Since so many people ask for this code, but never get
it, I figured I'd repost it. I didn't write it, but I
added the jpeg saving part, and modified it for my
device, which you will have to do to get it to work.
Just go into JMFRegistry and get the device name from
your webcam and then edit the code. Also, keep in mind
that some webcams don't work with JMF. You have to
have a webcam that supports VFW or WDM interface.
And here's the code:
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.media.control.*;
import javax.media.protocol.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
public class SwingCapture extends Panel implements
ActionListener
public static Player player = null;
public CaptureDeviceInfo di = null;
public MediaLocator ml = null;
public JButton capture = null;
public Buffer buf = null;
public Image img = null;
public VideoFormat vf = null;
public BufferToImage btoi = null;
public ImagePanel imgpanel = null;
public SwingCapture()
setLayout(new BorderLayout());
setSize(320,550);
imgpanel = new ImagePanel();
capture = new JButton("Capture");
capture.addActionListener(this);
String str1 = "vfw:Logitech USB Video Camera:0";
String str2 = "vfw:Microsoft WDM Image Capture
ure (Win32):0";
di = CaptureDeviceManager.getDevice(str2);
ml = di.getLocator();
try
player = Manager.createRealizedPlayer(ml);
player.start();
Component comp;
if ((comp = player.getVisualComponent()) !=
)) != null)
add(comp,BorderLayout.NORTH);
add(capture,BorderLayout.CENTER);
add(imgpanel,BorderLayout.SOUTH);
catch (Exception e)
e.printStackTrace();
public static void main(String[] args)
Frame f = new Frame("SwingCapture");
SwingCapture cf = new SwingCapture();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
playerclose();
System.exit(0);}});
f.add("Center",cf);
f.pack();
f.setSize(new Dimension(320,550));
f.setVisible(true);
public static void playerclose()
player.close();
player.deallocate();
public void actionPerformed(ActionEvent e)
JComponent c = (JComponent) e.getSource();
if (c == capture)
// Grab a frame
FrameGrabbingControl fgc =
fgc = (FrameGrabbingControl)
player.getControl("javax.media.control.FrameGrabbingCo
trol");
buf = fgc.grabFrame();
// Convert it to an image
btoi = new
= new BufferToImage((VideoFormat)buf.getFormat());
img = btoi.createImage(buf);
// show the image
imgpanel.setImage(img);
// save image
saveJPG(img,"c:\\test.jpg");
class ImagePanel extends Panel
public Image myimg = null;
public ImagePanel()
setLayout(null);
setSize(320,240);
public void setImage(Image img)
this.myimg = img;
repaint();
public void paint(Graphics g)
if (myimg != null)
g.drawImage(myimg, 0, 0, this);
public static void saveJPG(Image img, String s)
BufferedImage bi = new
new BufferedImage(img.getWidth(null),
img.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bi.createGraphics();
g2.drawImage(img, null, null);
FileOutputStream out = null;
try
out = new FileOutputStream(s);
catch (java.io.FileNotFoundException io)
System.out.println("File Not Found");
JPEGImageEncoder encoder =
r = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param =
m = encoder.getDefaultJPEGEncodeParam(bi);
param.setQuality(0.5f,false);
encoder.setJPEGEncodeParam(param);
try
encoder.encode(bi);
out.close();
catch (java.io.IOException io)
System.out.println("IOException");