Processor doesn't work correctly in saving stream to file

Question

hi,
i write this code for saving in a file video and audio from a web cam, but when i do p.getDataOuput it returns always null. Why? help me
  public void setupvideocapture()
  c=getContentPane();
  c.setLayout(new FlowLayout());
  try
    try {
      p = Manager.createProcessor(new MediaLocator("vfw://0"));
    } catch (Exception e) {
      System.err.println("Impossibile creare il processor!" + e);
    p.addControllerListener(this);
    p.configure();
    waitForState(p.Configured);
    p.setContentDescriptor(null);
    p.realize();
    waitForState(p.Realized);
    p.prefetch();
    waitForState(p.Prefetched);
    c.add(p.getVisualComponent());
    if ((dest = new MediaLocator("file:"+"foo.mov")) == null)   System.err.println("Impossibile costruire MediaLocator "  + "dalla url: " + dest);
    try {source = Manager.createDataSource(dest);
    } catch (Exception e) {
      System.err.println("Impossibile creare Datasource da: "+ dest);
      System.err.println("Eccezione: "+e);}
  catch(Exception e)
    System.out.println(e);
public void actionPerformed(ActionEvent ae)
    String str;
    str=ae.getActionCommand();
    if(str=="Play")
      try
       p.start();
        System.out.println(p);
        source=p.getDataOutput();
        System.out.println(source);
        sink = Manager.createDataSink(source,dest);
        dataSinkListener = new MyDataSinkListener();
        sink.addDataSinkListener(dataSinkListener);
        sink.open();
        sink.start();
      } catch (Exception e) {e.printStackTrace();
  else if(str=="Stop")
    try
      sink.stop();
      dataSinkListener.waitEndOfStream(0);
      sink.close();
      p.stop();
      p.close();
  catch(Exception e)
  {e.printStackTrace();
}

Answer 1

hi,
i write this code for saving in a file video and audio from a web cam, but when i do p.getDataOuput it returns always null. Why? help me
  public void setupvideocapture()
  c=getContentPane();
  c.setLayout(new FlowLayout());
  try
    try {
      p = Manager.createProcessor(new MediaLocator("vfw://0"));
    } catch (Exception e) {
      System.err.println("Impossibile creare il processor!" + e);
    p.addControllerListener(this);
    p.configure();
    waitForState(p.Configured);
    p.setContentDescriptor(null);
    p.realize();
    waitForState(p.Realized);
    p.prefetch();
    waitForState(p.Prefetched);
    c.add(p.getVisualComponent());
    if ((dest = new MediaLocator("file:"+"foo.mov")) == null)   System.err.println("Impossibile costruire MediaLocator "  + "dalla url: " + dest);
    try {source = Manager.createDataSource(dest);
    } catch (Exception e) {
      System.err.println("Impossibile creare Datasource da: "+ dest);
      System.err.println("Eccezione: "+e);}
  catch(Exception e)
    System.out.println(e);
public void actionPerformed(ActionEvent ae)
    String str;
    str=ae.getActionCommand();
    if(str=="Play")
      try
       p.start();
        System.out.println(p);
        source=p.getDataOutput();
        System.out.println(source);
        sink = Manager.createDataSink(source,dest);
        dataSinkListener = new MyDataSinkListener();
        sink.addDataSinkListener(dataSinkListener);
        sink.open();
        sink.start();
      } catch (Exception e) {e.printStackTrace();
  else if(str=="Stop")
    try
      sink.stop();
      dataSinkListener.waitEndOfStream(0);
      sink.close();
      p.stop();
      p.close();
  catch(Exception e)
  {e.printStackTrace();
}