Big problem with put the same received dataSource on two different panels

Question

Hello All!
I have a big problem, but first what have I done:
I am writting application that is based on AVReceiver2 and AVTransmit2 from Sun help.
I have modified AVReceiver2 to only receive one stream - video stream.
I show received video on scrollPane, but I want to show the same video on second scrollPane in the same time. I have read about cloning dataSource, but I don't know how to modify that code to make it work.
This is my receiver class (logger is my own class that have listbox, so don't watch on it. This is not important):
public class Połączenie implements ReceiveStreamListener, SessionListener,
     ControllerListener
    String session = null;
    RTPManager manager = null;
    public Player player1 = null;
    boolean dataReceived = false;
    Object dataSync = new Object();
    private Logger logger;
    private JPanelŹródłoPołączone panelOgólny;
    private JPanelŹródłoSzczegóły panelSzczegóły;
    private Date dataRozpoczęcia;
    public Połączenie(String session, JPanelŹródłoSzczegóły panelSzczegóły, JPanelŹródłoPołączone panelOgólny, Logger logger) {
        this.session = session;
        this.logger = logger;
        this.panelOgólny = panelOgólny;
        this.panelSzczegóły = panelSzczegóły;
    public void Start()
        if (!initialize())
            System.err.println("Failed to initialize the sessions.");
            System.exit(-1);
            System.err.println("Odbiór rozpoczęty");
    public boolean initialize() {
        try {
         InetAddress ipAddr;
         SessionAddress localAddr = new SessionAddress();
         SessionAddress destAddr;
         SessionLabel sessionLabel;
         // Open the RTP sessions.
           // Parse the session addresses.
          try {
              sessionLabel = new SessionLabel(session);
          } catch (IllegalArgumentException e) {
              System.err.println("Failed to parse the session address given: " + session);
              return false;
          System.err.println("  - Otwarcie sesji RTP: addr: " + sessionLabel.addr + " port: " + sessionLabel.port + " ttl: " + sessionLabel.ttl);
          manager = (RTPManager) RTPManager.newInstance();
          manager.addSessionListener(this);
          manager.addReceiveStreamListener(this);
          ipAddr = InetAddress.getByName(sessionLabel.addr);
          if( ipAddr.isMulticastAddress()) {
              // local and remote address pairs are identical:
              localAddr= new SessionAddress( ipAddr,
                                 sessionLabel.port,
                                 sessionLabel.ttl);
              destAddr = new SessionAddress( ipAddr,
                                 sessionLabel.port,
                                 sessionLabel.ttl);
          } else {
              localAddr= new SessionAddress( InetAddress.getLocalHost(),
                                      sessionLabel.port);
                    destAddr = new SessionAddress( ipAddr, sessionLabel.port);
          manager.initialize( localAddr);
          // You can try out some other buffer size to see
          // if you can get better smoothness.
          BufferControl bc = (BufferControl)manager.getControl("javax.media.control.BufferControl");
          if (bc != null)
              bc.setBufferLength(350);
              manager.addTarget(destAddr);
        } catch (Exception e){
            System.err.println("Cannot create the RTP Session: " + e.getMessage());
            return false;
     // Wait for data to arrive before moving on.
     long then = System.currentTimeMillis();
     long waitingPeriod = 30000;  // wait for a maximum of 30 secs.
     try{
         synchronized (dataSync) {
          while (!dataReceived &&
               System.currentTimeMillis() - then < waitingPeriod) {
              if (!dataReceived)
               System.err.println("  - Oczekiwanie na transmisj&#281; danych...");
              dataSync.wait(1000);
     } catch (Exception e) {}
     if (!dataReceived) {
         System.err.println("No RTP data was received.");
         close();
         return false;
        return true;
     * Close the players and the session managers.
    protected void close() {
         try {
            player1.close();
         } catch (Exception e) {}
     // close the RTP session.
         if (manager != null) {
                manager.removeTargets( "Closing session from AVReceive2");
                manager.dispose();
                manager = null;
     * SessionListener.
    public synchronized void update(SessionEvent evt) {
     if (evt instanceof NewParticipantEvent) {
         Participant p = ((NewParticipantEvent)evt).getParticipant();
         System.err.println("  - Do&#322;&#261;czy&#322; nowy u&#380;ytkownik: " + p.getCNAME());
     * ReceiveStreamListener
    public synchronized void update( ReceiveStreamEvent evt) {
     RTPManager mgr = (RTPManager)evt.getSource();
     Participant participant = evt.getParticipant();     // could be null.
     ReceiveStream stream = evt.getReceiveStream();  // could be null.
     if (evt instanceof RemotePayloadChangeEvent) {
         System.err.println("  - Received an RTP PayloadChangeEvent.");
         System.err.println("Sorry, cannot handle payload change.");
         System.exit(0);
     else if (evt instanceof NewReceiveStreamEvent) {
         try {
          stream = ((NewReceiveStreamEvent)evt).getReceiveStream();
          DataSource ds = stream.getDataSource();
//=========important thing:
                        DataSource cloneableDS = Manager.createCloneableDataSource( ds );
                        DataSource clonedDS = ((SourceCloneable)cloneableDS).createClone();
//========
          // Find out the formats.
          RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
          if (ctl != null){
              System.err.println("  - Recevied new RTP stream: " + ctl.getFormat());
          } else {
              System.err.println("  - Recevied new RTP stream");
          if (participant == null)
              System.err.println("      The sender of this stream had yet to be identified.");
          else {
              System.err.println("      The stream comes from: " + participant.getCNAME());
          // create a player by passing datasource to the Media Manager
//=====important thing:
                        player1 = javax.media.Manager.createPlayer(clonedDS);
//=====
          if (player1 == null)
              return;
          player1.addControllerListener(this);
          player1.realize();
          // Notify intialize() that a new stream had arrived.
          synchronized (dataSync) {
              dataReceived = true;
              dataSync.notifyAll();
         } catch (Exception e) {
          System.err.println("NewReceiveStreamEvent exception " + e.getMessage());
          return;
     else if (evt instanceof StreamMappedEvent) {
          if (stream != null && stream.getDataSource() != null) {
          DataSource ds = stream.getDataSource();
          // Find out the formats.
          RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
          System.err.println("  - The previously unidentified stream ");
          if (ctl != null)
              System.err.println("      " + ctl.getFormat());
          System.err.println("      had now been identified as sent by: " + participant.getCNAME());
     else if (evt instanceof ByeEvent) {
          System.err.println("  - Got \"bye\" from: " + participant.getCNAME());
      player1.close();
        manager.dispose();
    }

Answer 1

I wanted to show the same video stream on 2 panels at the same time. The panels are on 2 different Tabs of TabbedPane.
So I done some kind of switch:
- when user change tab, I change vievport from one panel to another. This works gr8, but I need to record some received video on the same time when user watch it.
I find some code to record - this works on single machine, but now, when I have cloned dataSource I supposed to be able to record received video, but guess what: it doesn't work.
Code of recording part:
           DataSource ds2; // I cloned this the same as I posted earlier
            PushBufferStream pbs;
     Vector camImgSize = new Vector();
     Vector camCapDevice = new Vector();
     Vector camCapFormat = new Vector();
     int camFPS;
     int camImgSel;
     Processor processor = null;
     DataSink datasink = null;
    public void record()
        fetchDeviceFormats();
          camImgSel=0;     // first format, or otherwise as desired
          camFPS = 30;     // framerate
          // Setup data source
          fetchDeviceDataSource();
          createPBDSource();
          createProcessor(ds2); // i'm using cloned datasource
          startCapture();
          try{Thread.sleep(20000);}catch(Exception e){}     // 20 seconds
          stopCapture();
     boolean fetchDeviceFormats()
          Vector deviceList = CaptureDeviceManager.getDeviceList(new VideoFormat(null));
          CaptureDeviceInfo CapDevice = null;
          Format CapFormat = null;
          String type = "N/A";
          CaptureDeviceInfo deviceInfo=null;boolean VideoFormatMatch=false;
          for(int i=0;i<deviceList.size();i++)
               // search for video device
               deviceInfo = (CaptureDeviceInfo)deviceList.elementAt(i);
               if(deviceInfo.getName().indexOf("vfw:")<0)continue;
               Format deviceFormat[] = deviceInfo.getFormats();
               for (int f=0;f<deviceFormat.length;f++)
                    if(deviceFormat[f] instanceof RGBFormat)type="RGB";
                    if(deviceFormat[f] instanceof YUVFormat)type="YUV";
                    if(deviceFormat[f] instanceof JPEGFormat)type="JPG";
                    Dimension size = ((VideoFormat)deviceFormat[f]).getSize();
                    camImgSize.addElement(type+" "+size.width+"x"+size.height);
                    CapDevice = deviceInfo;
                    camCapDevice.addElement(CapDevice);
                    //System.out.println("Video device = " + deviceInfo.getName());
                    CapFormat = (VideoFormat)deviceFormat[f];
                    camCapFormat.addElement(CapFormat);
                    //System.out.println("Video format = " + deviceFormat[f].toString());
                    VideoFormatMatch=true;     // at least one
          if(VideoFormatMatch==false)
               if(deviceInfo!=null)System.out.println(deviceInfo);
               System.out.println("Video Format not found");
               return false;
          return true;
     * Finds a camera and sets it up
     void fetchDeviceDataSource() //I test it on localhost so I don't change it
          CaptureDeviceInfo CapDevice = (CaptureDeviceInfo)camCapDevice.elementAt(camImgSel);
          System.out.println("Video device = " + CapDevice.getName());
          Format CapFormat = (Format)camCapFormat.elementAt(camImgSel);
          System.out.println("Video format = " + CapFormat.toString());
          try
               // ensures 30 fps or as otherwise preferred, subject to available cam rates but this is frequency of windows request to stream
               FormatControl formCont=((CaptureDevice)ds2).getFormatControls()[0];
               VideoFormat formatVideoNew = new VideoFormat(null,null,-1,null,(float)camFPS);
               formCont.setFormat(CapFormat.intersects(formatVideoNew));
          catch(Exception e){}
     * Gets a stream from the camera (and sets debug)
     void createPBDSource()
          try
               pbs=((PushBufferDataSource)ds2).getStreams()[0];
          catch(Exception e){}
     public void createProcessor(DataSource datasource)
          FileTypeDescriptor ftd = new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO);
          Format[] formats = new Format[] {new VideoFormat(VideoFormat.INDEO50)};
          ProcessorModel pm = new ProcessorModel(datasource, formats, ftd);
          try
               processor = Manager.createRealizedProcessor(pm);
          catch(Exception me)
               System.out.println(me);
               // Make sure the capture devices are released
               datasource.disconnect();
               return;
     private void startCapture()
          // Get the processor's output, create a DataSink and connect the two.
          DataSource outputDS = processor.getDataOutput();
          try
               MediaLocator ml = new MediaLocator("file:capture.avi");
               datasink = Manager.createDataSink(outputDS, ml);
               datasink.open();
               datasink.start();
          }catch (Exception e)
               System.out.println(e);
          processor.start();
          System.out.println("Started saving...");
     private void pauseCapture()
          processor.stop();
     private void resumeCapture()
          processor.start();
     private void stopCapture()
          // Stop the capture and the file writer (DataSink)
          processor.stop();
          processor.close();
          datasink.close();
          processor = null;
          System.out.println("Done saving.");
     }I run method record() from gui, after I received stream.
IMPORTANT:
     on:           processor.close();
I have an exception:
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 jmonitorserver.engine.Po&#322;&#261;czenie.stopCapture(Po&#322;&#261;czenie.java:684)
And the video file have 0kb, even during recording
datasource ds2 is not null.
any idea?