JMF Newbie Help and Dual Webcam

Question

Hi all,
I am a new user to JMF and am quite lost with the various examples found on the internet.
If there is a low-down, without the frills tutorial do point me to it.
This is the process of my program:
Selects a webcam
Saves image (I found solutions for this in omcgovern's post)
Reselect a webcam.
The thing is I need to be able to switch webcams as and when I like but the webcam select dialog only appears once.
And the capture device detection with null doesn't work, so I used a method that I found in another post.
My code that I'm posting is just a webcam app I modified, to have a start and stop button.
The start button is supposed to be able to select another web cam.
Do give me pointers!
Cheers.
import javax.media.Player;
import javax.media.CaptureDeviceInfo;
import javax.media.MediaLocator;
import javax.media.CaptureDeviceManager;
import javax.media.Manager;
import javax.media.format.*;
import java.util.Vector;
import java.awt.*;
import java.awt.event.*;
public class Test implements ActionListener {
CaptureDeviceInfo device;
MediaLocator ml;
Player player;
Component videoScreen;
public static void main(String args[]){
new Test();
Test(){
try
{ //gets a list of devices how support the given videoformat
//Vector deviceList = CaptureDeviceManager.getDeviceList();
// This works but its somewhat hard-coded (Nat)
// new CaptureDeviceInfo("vfw://0",new MediaLocator("vfw:Microsoft WDM Image Capture (Win32):0"),null);
// new CaptureDeviceInfo("vfw://1",new MediaLocator("vfw:Microsoft WDM Image Capture (Win32):1"),null);
// new CaptureDeviceInfo("vfw://2",new MediaLocator("vfw:Microsoft WDM Image Capture (Win32):2"),null);
device = new CaptureDeviceInfo("vfw://0",new MediaLocator("vfw:Microsoft WDM Image Capture (Win32):0"),null);
//device = (CaptureDeviceInfo) deviceList.firstElement();
ml = device.getLocator();
player = Manager.createRealizedPlayer(ml);
player.start();
videoScreen = player.getVisualComponent();
videoScreen.setBounds(10,10,300,300);
Button a = new Button("Stop");
a.setBounds(10,320,75,25);
a.addActionListener(this);
Button b = new Button("Start");
b.addActionListener(this);
b.setBounds(235,320,75,25);
Frame frm=new Frame();
frm.setLayout(null);
frm.setSize(360,360);
frm.add(a);
frm.add(b);
frm.add(videoScreen);
frm.setVisible(true);
catch(Exception e)
System.out.println(e);
// My findings on experiments so far.
// player.stop() and player.start() can be used continuously unless you call player.close();
// What is the code that pops up the webcam selector??
public void actionPerformed(ActionEvent e) {
     Button button = (Button)e.getSource();
     if(button.getLabel().equals("Start")) {
          try {
               device = new CaptureDeviceInfo("vfw://0",new MediaLocator("vfw:Microsoft WDM Image Capture (Win32):0"),null);
               System.out.println("Test1");
               ml = device.getLocator();
               System.out.println("Test2");
               player = Manager.createRealizedPlayer(ml);
               System.out.println("Test3");
               player.start();
               System.out.println("Test4");
               videoScreen = player.getVisualComponent();
               System.out.println("Test");
          } catch(Exception ex) {System.out.println("Start error!");}
     else {
          player.stop();
          player.close();
}

Answer 1

You're probably in deep trouble then.... but nothing an investment into a cheap modern web cam couldn't cure...
Have you checked the Web Cam web site for any updated drivers ?
Here's a list of supported devices...
http://java.sun.com/products/java-media/jmf/2.1.1/formats.html#Capturers
regards,
Owen