Cloned datasource, but unable to use the both at the same time

Question

I used the AVTransmit java application as sampe to build my applet for transmitting realtime image from the webcam. I desired that it has a container to contain the player and it has a button for RTP transmission.
I have used the Manager.createCloneableDataSource(ds) to clone the datasource from webcam.
The applet can display realtime image on the container. While I clicked the button, the container hanged up and then changed to black. But the data can transmit by RTP part. I can receive the transmitted image in another PC.
Do you have any idea ?
     public void init() {
          Component vc = null;
          Component cp = null;
          JPanel visualContainer = new JPanel();
          visualContainer.setLayout(new BorderLayout());
          JPanel mainPanel = new JPanel();
          mainPanel.setLayout(new GridLayout(2,1));
          JPanel inputPanel = new JPanel();
          inputPanel.setLayout(new GridLayout(2,1));
          Vector vlist = CaptureDeviceManager.getDeviceList(new VideoFormat(VideoFormat.YUV));
          for (int i = 0; i < vlist.size(); i++) {
               CaptureDeviceInfo vinfo = (CaptureDeviceInfo)vlist.elementAt(i);
               locator = vinfo.getLocator();
          try {
               ds = Manager.createDataSource(locator);
          } catch (Exception e) {
               System.err.println("Unable to create DataSource from : " + locator);
               System.exit(0);
          ds = Manager.createCloneableDataSource(ds);
          if (ds == null) {
               System.err.println("Unable to clone the DataSource");
               System.exit(0);
          try {
               player = Manager.createRealizedPlayer(ds);               
          } catch (Exception e) {
               System.err.println("Unable to create a player from the DataSource :" + e);
          player.addControllerListener(new PlayerStateListener());
          //Realize the player
          player.prefetch();
          if (!waitForPlayerState(player.Prefetched)) {
               System.err.println("Failed to realize the player");
               //return false;
          if ((vc = player.getVisualComponent()) != null)
               visualContainer.add(vc, BorderLayout.CENTER);
          if ((cp = player.getVisualComponent()) != null)
               visualContainer.add(cp, BorderLayout.SOUTH);
          player.start();
          mainPanel.add(visualContainer);
          System.out.println(player);          
          setVisible(true);
          getContentPane().setLayout(new BorderLayout());
          ipAddressField = new JTextField();
          pbField = new JTextField();
          sendButton = new JButton("Submit");
          sendButton.addActionListener(this);
          inputPanel.add(ipAddressField);
          inputPanel.add(pbField);
          inputPanel.add(sendButton);
          mainPanel.add(inputPanel);
          getContentPane().add(mainPanel);
          System.out.println("locator = " + locator);
// this is the code segment for RTP transmit
          try {
               processor = javax.media.Manager.createProcessor(ds);          
          } catch (NoProcessorException npe) {
               return "Couldn't create processor";
          } catch (IOException ioe) {
               return "IOException creating processor";
          // Wait for it to configure
          boolean result = waitForProcessorState(processor, Processor.Configured);
          if (result == false)
               return "Couldn't configure processor";
          // Get the tracks from the processor
          TrackControl [] tracks = processor.getTrackControls();
          // Do we have atleast one track?
          if (tracks == null || tracks.length < 1)
               return "Couldn't find tracks in processor";
          // Set the output content descriptor to RAW_RTP
          // This will limit the supported formats reported from
          // Track.getSupportedFormats to only valid RTP formats.
          ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
          processor.setContentDescriptor(cd);
          Format supported[];
          Format chosen;
          boolean atLeastOneTrack = false;
          // Program the tracks.
          for (int i = 0; i < tracks.length; i++) {
               Format format = tracks.getFormat();
               if (tracks[i].isEnabled()) {
                    supported = tracks[i].getSupportedFormats();
               // We've set the output content to the RAW_RTP.
               // So all the supported formats should work with RTP.
               // We'll just pick the first one.
               if (supported.length > 0) {
                    if (supported[0] instanceof VideoFormat) {
                         // For video formats, we should double check the
                         // sizes since not all formats work in all sizes.
                         chosen = checkForVideoSizes(tracks[i].getFormat(), supported[0]);
                    } else
                         chosen = supported[0];
                         tracks[i].setFormat(chosen);
                         System.err.println("Track " + i + " is set to transmit as:");
                         System.err.println(" " + chosen);
                         atLeastOneTrack = true;
                    } else
                         tracks[i].setEnabled(false);
                    } else
                         tracks[i].setEnabled(false);
          if (!atLeastOneTrack)
               return "Couldn't set any of the tracks to a valid RTP format";
          // Realize the processor. This will internally create a flow
          // graph and attempt to create an output datasource for JPEG/RTP
          // audio frames.
          result = waitForProcessorState(processor, Controller.Realized);
          if (result == false)
               return "Couldn't realize processor";
          // Set the JPEG quality to .5.
          setJPEGQuality(processor, 0.5f);
          // Get the output data source of the processor
Many thank you in advance

Answer 1

Dear jcparques
Thank you for your reply.
I have tried to use the clone datasoure for player and original datasource for RTP transmission, the player displayed black and the RTP successfully, as I can get the live image by another PC. I have tried to use the clone datasoure for RTP and original datasource for player, the player worked normal and the another PC awared the participant joined. It has just waiting the data from RTP.
I sured the datasource has been cloned as I can System.out.println it, it is not a null.
Any idea. Thank you very much.