Problem capturing video . JMF help please!!

Question

I have heard  from somewhere that 'Captfoss' is mesiah in video-capturing problems.
So if it is like that then please help me.
Moreover 'T.B.M', I followed your style of coding so you please help me out.
Thanks in advance.I have written this following code for capturing video file. I am not getting any errors, but when I click the start button it throws Exception.
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import javax.media.*;
import javax.media.protocol.*;
import javax.media.protocol.DataSource;
import java.net.URL;
import java.util.Vector;
import javax.swing.ImageIcon;
import javax.media.ControllerListener;
import javax.media.format.*;
import javax.media.protocol.FileTypeDescriptor;
import javax.media.protocol.DataSource;
import javax.media.control.StreamWriterControl;
public class CaptureAgain extends Frame implements ActionListener, ControllerListener
     Panel cPanel;
     Button startCapture;                         // AWT variables
     Button stopCapture;
     private Closer handler;                         // Adaptor object
     Format format[] = new Format[1];
     Vector deviceList = null;
     MediaLocator outputType = null;   // JMF variables
     Processor player = null;
     DataSink filewriter = null;
     Boolean realized;
     CaptureAgain()
          setVisible(true);
          setTitle("J-Solve Monitoring System");
          setSize(300,200);
          setLayout(new BorderLayout());
          cPanel = new Panel();
          startCapture = new Button("Start");
          stopCapture = new Button("Stop");
          startCapture.setEnabled(false);     //Start button is disabled till it gets realized
          startCapture.addActionListener(this);
          stopCapture.addActionListener(this);
          cPanel.add(startCapture);
          cPanel.add(stopCapture);
          add("South",cPanel);
          handler = new Closer();
          addWindowListener(handler);
          deviceList = CaptureDeviceManager.getDeviceList(new VideoFormat(VideoFormat.YUV));
          //format[0] = new VideoFormat(VideoFormat.YUV);
          outputType =((CaptureDeviceInfo)deviceList.firstElement()).getLocator();
          try
               player = Manager.createProcessor(outputType);
               System.out.println("Processor created");
               //System.exit(0);
          catch (IOException e)
               System.err.println("IO exception caught" +e);
          catch (NoProcessorException e)
               System.err.println("NoProcessor exception caught" +e);
          player.addControllerListener(this);
          player.configure();
          try
               Thread.sleep(500);
          catch(InterruptedException e)
               System.err.println("Interrupted Exception caught :"+e);
          player.setContentDescriptor(new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO));
          //outputType = new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO);
          player.realize();
          System.out.println("Player realizing");
          try
               Thread.sleep(1000);
          catch(InterruptedException e)
               System.err.println("Interrupted Exception caught :"+e);
     public synchronized void controllerUpdate(ControllerEvent event)
               //validate();
               try
                    if (event instanceof RealizeCompleteEvent)
                         Component comp;
                         try
                              filewriter = Manager.createDataSink(player.getDataOutput(),new MediaLocator("file:/e:/Captured.avi") );
                         catch (NoDataSinkException e)
                              System.err.println("No data sink exception caught" +e);
                         catch (SecurityException e)
                              System.err.println("Security exception caught" +e);
                         System.out.println("Realized");
                         startCapture.setEnabled(true);
                         if ((comp = player.getVisualComponent()) != null)
                              add (BorderLayout.CENTER, comp);
                         else
                              System.out.println("No visual component");
                         if ((comp = player.getControlPanelComponent()) != null)
                              add (BorderLayout.NORTH, comp);
                         validate();
                         System.out.println("Updated");
               catch(Exception e)
                    System.out.println("Exception rasied "+e);
     public void actionPerformed(ActionEvent ae)
          String command = ae.getActionCommand();
               if(command.equals("Start"));
                    try
                         filewriter.open();
                         System.out.println("Data Sink opened");
                         filewriter.start();
                         System.out.println("Data Sink started");
                    catch (IOException e)
                         System.err.println("IO exception caught" +e);
                    player.start();
                    System.out.println("Processor started");
                    // Starting processor
               //     g.drawString("Started",10,10);
               if(command.equals("Stop"));
                    player.stop();
                    player.close();
                    System.out.println("Processor stopped");
                    try
                         wait(100);
                    catch(InterruptedException e)
                         System.err.println("Interrupted exception caught :"+e);
                    // Closing DataSink
                    try
                         filewriter.stop();
                    catch(IOException e)
                         System.err.println("IO exception caught "+e);
                    filewriter.close();     
                    System.out.println("Data Sink CLosed");
          //     g.drawString("Stopped",10,10);
     public static void main(String args[])
          CaptureAgain ca = new CaptureAgain();
          Image icon = Toolkit.getDefaultToolkit().getImage("logo.jpg");
          ca.setIconImage(icon);
          ca.setVisible(true);
class Closer extends WindowAdapter
     public void windowClosing(WindowEvent we)
          System.exit(0);
}And When I run it works.
But as soon as I click Start it shows following
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at com.sun.media.multiplexer.video.AVIMux.writeFooter(AVIMux.java:827)
    at com.sun.media.multiplexer.BasicMux.close(BasicMux.java:142)
    at com.sun.media.BasicMuxModule.doClose(BasicMuxModule.java:172)
    at com.sun.media.PlaybackEngine.doClose(PlaybackEngine.java:872)
    at com.sun.media.BasicController.close(BasicController.java:261)
    at com.sun.media.BasicPlayer.doClose(BasicPlayer.java:229)
    at com.sun.media.BasicController.close(BasicController.java:261)
    at CaptureAgain.actionPerformed(CaptureAgain.java:182)
    at java.awt.Button.processActionEvent(Button.java:392)
    at java.awt.Button.processEvent(Button.java:360)
    at java.awt.Component.dispatchEventImpl(Component.java:4410)
    at java.awt.Component.dispatchEvent(Component.java:4240)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)Acoording to the program during execution(runtime) I am able to get this things up till start button is clicked.
Processor created
Player realizing
Realized
No visual component
Updated
Data Sink opened
Data Sink started
Processor startedWhich means I am able to even start the Processor, then how come it is showing this error.

Answer 1

Now I changed my code to following
import java.awt.*;
import java.net.*;
import javax.media.*;
import java.awt.event.*;
import javax.swing.*;
import javax.media.format.*;
import javax.media.protocol.*;
import javax.media.control.*;
import java.util.*;
public class CaptureAgain extends Frame implements ActionListener, ControllerListener
     Panel cPanel;
     Button startCapture;                         // AWT variables
     Button stopCapture;
     private Closer handler;                         // Adaptor object
     Processor player=null;
     MediaLocator outputType;
     Vector deviceList ;
     DataSink filewriter ;
     Boolean realized;
     CaptureAgain()
          setVisible(true);
          setTitle("J-Solve Monitoring System");
          setSize(300,200);
          setLayout(new BorderLayout());
          cPanel = new Panel();
          startCapture = new Button("Start");
          stopCapture = new Button("Stop");
          startCapture.setEnabled(false);     //Start button is disabled till it gets realized
          startCapture.addActionListener(this);
          stopCapture.addActionListener(this);
          cPanel.add(startCapture);
          cPanel.add(stopCapture);
          add("South",cPanel);
          handler = new Closer();
          addWindowListener(handler);
          try
               deviceList = CaptureDeviceManager.getDeviceList(new VideoFormat(VideoFormat.YUV));
               //format[0] = new VideoFormat(VideoFormat.YUV);
               outputType =((CaptureDeviceInfo)deviceList.firstElement()).getLocator();
               player = Manager.createProcessor(outputType);
               System.out.println("Processor created");
               player.addControllerListener(this);
               player.configure();
               Thread.sleep(500);
               player.setContentDescriptor(new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO));
               //outputType = new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO);
               player.realize();
               System.out.println("Player realizing");
               Thread.sleep(1000);
          catch(Exception e)
               System.err.println("Exception caught :"+e);
     public synchronized void controllerUpdate(ControllerEvent event)
               //validate();
               try
                    if (event instanceof RealizeCompleteEvent)
                         Component comp;
                         System.out.println("Realized");
                         filewriter = Manager.createDataSink(player.getDataOutput(), new MediaLocator("file:/e:/Captured.avi"));
                         startCapture.setEnabled(true);
                         if ((comp = player.getVisualComponent()) != null)
                              add (BorderLayout.CENTER, comp);
                         else
                              System.out.println("No visual component");
                         if ((comp = player.getControlPanelComponent()) != null)
                              add (BorderLayout.NORTH, comp);
                         validate();
                         System.out.println("Updated");
               catch(Exception e)
                    System.out.println("Exception rasied "+e);
     public void actionPerformed(ActionEvent ae)
          try
               String command = ae.getActionCommand();
               if(command.equals("Start"));
                    filewriter.open();
                    System.out.println("Data Sink opened");
                    filewriter.start();
                    System.out.println("Data Sink started" + filewriter);
                    player.start();
                    System.out.println("Processor started" + player);
                    // Starting processor
               //     g.drawString("Started",10,10);
               if(command.equals("Stop"));
                    player.stop();
                    player.close();
                    // Closing DataSink
                    filewriter.stop();
                    filewriter.close();     
                    System.out.println("Data Sink CLosed");
               //     g.drawString("Stopped",10,10);
          catch(Exception e)
               System.out.println("Exception : "+e);
     public static void main(String args[])
          CaptureAgain ca = new CaptureAgain();
          Image icon = Toolkit.getDefaultToolkit().getImage("logo.jpg");
          ca.setIconImage(icon);
          //ca.setVisible(true);
class Closer extends WindowAdapter
     public void windowClosing(WindowEvent we)
          System.exit(0);
}OK .
now I am not getting previous errors.
But now I am getting null pointer exception on clicking the Start button.
Even the file is created.(56 kb)
On your advice I displayed the player and filewriter and got following things
(after clicking start and same even when created in the constructor)
Data Sink started com.sun.media.datasink.file.Handler@1fdc96c
Processor started com.sun.media.processor.unknown.Handler@186d4c1If you find something please let me know.
Thanks in advance.
This shows that processor is having some problem and cant render. While file is created and the println statement shows Data sink object is working fine.