Cannot create the RTP Session: Can't open local data port

Question

Hi,
I'm trying to connect to two webcams simultaneously in the order:
MediaLocator inputLocator1 = new MediaLocator("rtp://hostname1:8000/video");
MediaLocator inputLocator2 = new MediaLocator("rtp://hostname2:8000/video");
But I get this during the second connection:
Cannot create the RTP Session: Can't open local data port: 8000
And I can't see the video from hostname2.
I did a check via netstat, and it seems that both mycomputer is receiving the video from both hostname1 & hostname2:
TCP mycomputer:3236 hostname1:8000 ESTABLISHED
TCP mycomputer:3264 hostname2:8000 ESTABLISHED
TCP connections to both host were established!! But why can't I see the video of hostname2???? I've thought of 2 possible reasons why I cannot see the video of hostname2:
1. Is this set of local data port maintained by Java? i.e It's not the same as the TCP port 8000 that I see in mycomputer's netstat. If yes, Java has assigned its local data port 8000 to hostname1, so it fails to reassign that port 8000 to hostname2 while hostname1 is still connected. Any other way to fix this apart from changing the portnumber of hostname2?
2. It has to do with the custom.jar? I've read in an article somewhere in the forum that the custom.jar has to be customized (using JFMCustomizer) to receive video from two hosts with the same portnumber. Can someone elaborate the necessary boxes to check in the JFMCustomizer?
Thanks much,
Rach

Answer 1

After all this while, I finally figured out the problem. In my code, I use MediaLocator to code the receiver and the transmitter. E.g.:
MediaLocator inputLocator1 = new MediaLocator("rtp://hostname1:8000/video");
player1 = Manager.createPlayer(inputLocator1)
MediaLocator inputLocator2 = new MediaLocator("rtp://hostname2:8000/video");
player2 = Manager.createPlayer(inputLocator2)
Manager would complain "Cannot create the RTP Session: Can't open local data port: 8000" because port 8000 is already used up by player1, i.e.:
mycomputer:8000 maps to hostname1:8000
mycomputer:8000 cannot re-map to hostname2:8000
To work around this, I'll need to use SessionAddress. SessionAddress provides the flexibility to do an independent local port mapping, e.g.:
mycomputer:5000 maps to hostname1:8000
mycomputer:5002 maps to hostname2:8000
Rach