How to capture screen activity? (screen&audio to video file)

Question

Hello,
I have to capture video desktop activity (including audio) to a file using JMF. I spent hours and hours searching this... a have studied a lot of classes, examples BUT I don't know how to bind them... how to record the actvity. My project is to record screen activity, upload on a server and finally control my computer remotely from an applet (or from another java desktop application). I will use HTTP streaming (what I record I upload on a server, then stream it to the client)
Can someone show me some hints or code for modifying JVidCap example from Sun? Someone else on Sun forum said he could do it but did not say how...
I just want to modify the video capturing so that I get the screen actifity recorded. I read nearly all examples possible including Screen Grabber...
Please help me!
I also have those two classes to get the screen activity as datasource... from [Screen Grabber|http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/ScreenGrabber.html] example but I really don't understand how to implement them in my application because there is no method returning a datasource object... (or probably I don't know how to use them):
(DataSource and LiveStream class)
I hope someone can bind them or help me to go on on this project.... it is so important to me ...

Answer 1

Thanks A LOT for info. I really apprectiate it. This is my code... many mistakes I think... I have a NullPointerException. I renamed DataSource class to CDataSource and instead of line: "stream = streams[0] = new LiveStream(getLocator());" I passed the media locator:"stream = streams[0] = new LiveStream(ml);"
public class capture extends javax.swing.JFrame implements DataSinkListener{
    private DataSink dataSink;
    private Processor outputProcessor;
    CaptureDeviceInfo cdi;
    public capture() throws IOException, NoDataSourceException, NoPlayerException, CannotRealizeException, IncompatibleSourceException {
                initComponents();
// video DataSource
        MediaLocator sourceLocator = new MediaLocator("screen://352,264,320,240/5");
         * javax.media.NoDataSourceException: Cannot find a DataSource for: screen://352,264,320,240/5
        at javax.media.Manager.createDataSource(Manager.java:1037)
at commented line bellow*/
       // CDataSource videoDS = (CDataSource) Manager.createDataSource(sourceLocator);
        CDataSource videoDS = new CDataSource(sourceLocator);
// sound DataSource
         cdi = CaptureDeviceManager.getDevice("DirectSoundCapture");         
         MediaLocator soundMediaLocator = cdi.getLocator();
         DataSource soundDS = Manager.createDataSource(soundMediaLocator);
         //merge Data Sources - is it correct?
         DataSource ds = Manager.createMergingDataSource(new DataSource[]{videoDS, soundDS});
//check them - NullPointerException here, so I think the video DataSource is not correct? or merging is not correct?
          * Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at com.ibm.media.protocol.MergingDataSource.getContentType(MergingDataSource.java:53)
        at com.ibm.media.protocol.MergingPushBufferDataSource.getContentType(MergingPushBufferDataSource.java:63)
          System.out.println("ds: \n" + ds.getContentType() + ":" +
                                ((PushBufferDataSource) ds).getStreams()[0].getFormat() + "\n" +
                                ((PushBufferDataSource) ds).getStreams()[1].getFormat());
//save to video file
         saveFile(ds);
         //handler
                addWindowListener(new WindowAdapter() {
                        @Override
                        public void windowClosed(WindowEvent e) {
                                try {
                                        if(outputProcessor != null) {
                                                outputProcessor.close();
                                        if(dataSink != null) {
                                                dataSink.close();
                                                dataSink.stop();
                                } catch(IOException ex) {
                                        ex.printStackTrace();
            private void saveFile(DataSource ds) throws NotRealizedError {
                  ProcessorModel outputPM = new ProcessorModel(ds,
                        new Format[]{new VideoFormat(VideoFormat.JPEG),new AudioFormat(AudioFormat.LINEAR)},
                        new FileTypeDescriptor(FileTypeDescriptor.QUICKTIME)
                  //save file here
                MediaLocator dest = new MediaLocator("file://C:/rec.mov");
                try {
                        outputProcessor = Manager.createRealizedProcessor(outputPM);
                        DataSource newDS = outputProcessor.getDataOutput();
                        newDS.connect();
                        newDS.start();
                        dataSink = Manager.createDataSink(newDS, dest);
                        dataSink.open();
                        dataSink.start();
                        dataSink.addDataSinkListener(this);
                        //record to that file
                        outputProcessor.start();
                } catch(Exception e) {
                        e.printStackTrace();
}I a starter in JMF (but not in java)... However I read so much JMF these days... I hope I will be a pro one day... :)
Can you tell me my mistakes please? Should I use Merge class? (from example). Is video datasource correct?