JMF: Cannot connect to device

**jonsamwell** · 08-26-2008, 12:29 AM

Hi,

I'm just playing about with JMF at the moment and want to capture video from my webcam and mic, i have the following so far (not complete) but everytime it compiles with the error

"java.io.IOException: Could not connect to capture device
javax.media.NoDataSourceException: Error instantiating class: com.sun.media.protocol.vfw.DataSource : java.io.IOException: Could not connect to capture device
at javax.media.Manager.createDataSource(Manager.java: 1012)
at test1.FindDevices.main(FindDevices.java:74)
"
but only after opening a capture source dialog to select my webcam. any thoughts?

The error is something to do with this line:

Java Code:

DataSource videoDataSource1 = Manager.createDataSource(get_video);

Full Code

Java Code:

import javax.swing.UIManager;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import java.io.*;

import javax.media.*;
import javax.media.datasink.*;
import javax.media.format.*;
import javax.media.protocol.*;
import javax.media.util.*;
import javax.media.control.*;

/**
 *
 * @author Jon
 */
public class FindDevices {
    
    
  public static void main(String[] args) throws IOException, NoPlayerException {
      

    //Capture Video Device info
    Vector videoList = CaptureDeviceManager.getDeviceList(new VideoFormat(VideoFormat.RGB));
    System.out.println("Number of Video Capture Devices Found: " +videoList.size());
    System.out.println("Video Elements: " +videoList.elements());
    
    //Capture Audio Device info
    Vector audioList = CaptureDeviceManager.getDeviceList(new AudioFormat(AudioFormat.LINEAR));
    System.out.println("Number of Audio Capture Devices Found: " +audioList.size());
    System.out.println("Video Elements: " +audioList.elements());
    
    //Gets Devices Info + Name @ Element[0] in array
    CaptureDeviceInfo video_device = (CaptureDeviceInfo) videoList.elementAt(0);
    CaptureDeviceInfo audio_device = (CaptureDeviceInfo) audioList.elementAt(0);
    
        System.out.println();
        
   System.out.println("Video Device Name: "+video_device.getName());
   System.out.println("Video Device Format: "+video_device.getFormats());
    
   System.out.println("Audio Device Name: "+audio_device.getName());
   System.out.println("Audio Device Format: "+audio_device.getFormats());
   
        System.out.println();
        
    //Location of Video Device @ Element[0]    
    MediaLocator get_video = video_device.getLocator();
    System.out.println("Video Location: "+get_video);
    
     //Location of Audio Device @ Element[0]    
    MediaLocator get_audio = audio_device.getLocator();
    System.out.println("Audio Location: "+get_audio);
    
        try {
            
            //Add a datasource and creates a processor object
            DataSource videoDataSource1 = Manager.createDataSource(get_video);
           
            Processor p = Manager.createProcessor(videoDataSource1);
            
            //Prepares the processor for configuration
            p.configure();
            System.out.println("Data Output: " +p.getDataOutput());
            
            
            
        } catch(NoDataSourceException e) {
			e.printStackTrace();
                
            
        }

  }