Video RTP transmittion problem

Question

Hey guys (and girls),
I'm writing two programs that either send or receive a RTP video stream captured with a webcam. Using JMStudio I can capture and transmit the video and happily receive it with my client program, but when I try to capture and transmit the video using my server program the client can't realize because it's not got any data.
Here is my transmitter code, my server class creates a new instance of the camTransmitter class.
import java.io.*;
import java.awt.*;
import java.util.Vector;
import javax.swing.*;
import java.awt.event.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.protocol.*;
import javax.media.control.*;
import javax.media.ControllerListener;
import javax.media.rtp.*;
import javax.media.rtp.rtcp.*;
import javax.media.rtp.event.*;
import javax.media.rtp.SendStreamListener.*;
import java.net.InetAddress;
public class camTransmitter implements ControllerListener
     Processor p = null;
     CaptureDeviceInfo di = null;
     boolean configured, realized = false;
     public String ipAddress = "192.168.123.150";
     public int port = 22222;
     public RTPManager rtpMgrs[];
     public DataSource vDS;
     public SessionAddress localAddr, destAddr;
     public InetAddress ipAddr;
     public SendStream sendStream;
    public camTransmitter()
     // First, we'll need a DataSource that captures live video
     Format vFormat = new VideoFormat(VideoFormat.RGB);
     Vector devices = CaptureDeviceManager.getDeviceList(vFormat);
     if (devices.size() > 0)
          di = (CaptureDeviceInfo) devices.elementAt(0);
     else
          // exit if we could not find the relevant capture device.
          System.out.println("no devises");          
          System.exit(-1);
     MediaLocator camLoctation = di.getLocator();
     // Create a processor for this capture device & exit if we
     // cannot create it
     try
          vDS = Manager.createDataSource(camLoctation);
          p = Manager.createProcessor(vDS);
          p.addControllerListener(this);
     catch (IOException e) {
          System.exit(-1);
     }catch (NoProcessorException e) {
          System.exit(-1);
     }catch(NoDataSourceException e) {
          System.exit(-1);
     // at this point, we have succesfully created the processor.
     // Realize it and block until it is configured.
     p.configure();
     while(configured != true){}
     // block until it has been configured
     p.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW_RTP));
     TrackControl track[] = p.getTrackControls();
     boolean encodingOk = false;
     // Go through the tracks and try to program one of them to
     // output ULAW_RTP data.
     for (int i = 0; i < track.length; i++)
          if (!encodingOk && track[i] instanceof FormatControl)
               if (((FormatControl)track).setFormat(vFormat) == null)
                    track[i].setEnabled(false);
               else
                    encodingOk = true;
          else
               // we could not set this track to gsm, so disable it
               track[i].setEnabled(false);
     // Realize it and block until it is realized.
     p.realize();
     while(realized != true){}
     // block until realized.
     // get the output datasource of the processor and exit
     // if we fail
     DataSource ds = null;
     try
          ds = p.getDataOutput();
     catch (NotRealizedError e)
          System.exit(-1);
     PushBufferDataSource pbds = (PushBufferDataSource)ds;
     PushBufferStream pbss[] = pbds.getStreams();
     rtpMgrs = new RTPManager[pbss.length];
     for (int i = 0; i < pbss.length; i++) {
     try {
          rtpMgrs[i] = RTPManager.newInstance();
          ipAddr = InetAddress.getByName(ipAddress);
          localAddr = new SessionAddress(InetAddress.getLocalHost(),port);
          destAddr = new SessionAddress(ipAddr, port);
          System.out.println(localAddr);
          rtpMgrs[i].initialize(destAddr);
          rtpMgrs[i].addTarget(destAddr);
          System.out.println( "Created RTP session: " + ipAddress + " " + port);
          sendStream = rtpMgrs[i].createSendStream(ds, i);          
          sendStream.start();
     } catch (Exception e) {
          System.err.println(e.getMessage());
     //System.out.println("RTP Stream created and running");
public void controllerUpdate(ControllerEvent e)
     if(e instanceof ConfigureCompleteEvent)
          System.out.println("Configure Complete");
          configured = true;
     if(e instanceof RealizeCompleteEvent)
          System.out.println("Ralizing complete");
          realized = true;
When I run this the processor realizes and the RTP seems to stream, but I have no idea why I can't receive the video from this.
Pls help if anyone can Thanks

Answer 1

Dear andreyvk ,
I've read your post
http://forum.java.sun.com/thread.jspa?threadID=785134&tstart=165
about how to use a single RTP session for both media reception and trasmission (I'm referring to you RTPSocketAdapter modified version), but, at the moment, I'receive a BIND error.
I think that your post is an EXCELLENT solution. I'modified AVReceive3 and AVTransmit3 in order to accept all parameters (Local IP & Port, Remote IP & Port).
Can you please give me a simple scenario so I can understand what the mistake?
I'use AVTransmit3 and AVReceive3 from different prompts and if I run these 2 classes contemporarely both in 2 different PC (172.17.32.27 and 172.17.32.30) I can transmit the media (vfw://0 for example) using AVTransmit3 but I'can't receive nothing if I run also AVReceive3 in the same PC?
What's the problem? Furthermore, If I run first AVReceive3 from a MSDOS Prompt and subsequently I run AVTransmit3 from another prompt I see a BIND error (port already in use).
How can I use your modified RTPSocketAdapter in order to send and receive a single media from the same port (e.g. 7500).
I've used this scenario PC1: IP 172.17.32.30 Local Port 5000 and PC2:IP 172.17.32.27 LocalPort 10000
So in the PC1 I run:
AVTransmit3 vfw://0 <Local IP 172.17.32.30> <5000> <Remote IP 172.17.32.27> <10000>
AVReceive3 <Local IP 172.17.32.30/5000> <Remote IP 172.17.32.27/10000>
and in PC2:
AVTransmit3 vfw://0 <Local IP 172.17.32.27> <10000> <Remote IP 172.17.32.30> <5000>
AVReceive3 <Local IP 172.17.32.27/10000> <Remote IP 172.17.32.30/5000>
I'd like to use the same port 5000 (in PC1) and 10000 (in PC2) in order to transmit and receive rtp packets. How can i do that without receive a Bind Error? How can I receive packets (and playing these media if audio &/or video) from the same port used to send stream over the network?
How can I obtain a RTP Symmetric Transmission/Reception solution?
Please give me an hint. If you can't post this is my email: [email protected]