Webcam Stream (External JPEG)

Hi, I'm designing a website aiming to provide visual coverage
of surfing locations across the UK through the use of webcam
images. Each of the images themselves will be retrieved externally,
with permission, from various hotels over-looking these locations.
I have spoken to someone who has completed a similar project,
a widget which retrieves and displays webcam images, which can be
viewed here:
http://www.ukbiketrails.co.uk/ukss/weCams.php
I would like to use the same method. Explained in his own
words:
'The feeds you see in the widget are simply JPEG images
hosted on the originating website, so none of the feeds are handled
by myself. The widget sends a HTTP request for the JPEG and
displays what it gets in the widget.'
As you can tell from the link url, he's used PHP, which I
have been learning.
I have lost contact with him recently and not sure the steps
I should take to integrate such a feature into my website. Please
help.

Any help is much appreciated

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Hi, I am working on a robotics project where I use Java and JMF for image processing which is passed through JNI to OpenCV. My project pages are at: http://robot.lonningdal.net
I am having problems with performance - the VIA CN13000 board is not exactly a racer, but a good and cheap alternative for robotics projects. The two main CPU consumers are speech recognition and webcamera stream handling.
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Hi John,
I saw your update to my original thread in
http://forum.java.sun.com/thread.jspa?threadID=570463&start=0&tstart=0
I'm always glad to hear people using the code :-)
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I've had some success with this approach before.
So, assuming you still kept the setFormat() method from my code, here's a simple hard coded modification, where you set the framerate in the code.
Ps. just curious, whereabouts you are in the world ?
regards,
Owen
public void setFormat ( VideoFormat selectedFormat )
        if ( formatControl != null )
            player.stop();
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replace with
public void setFormat ( VideoFormat selectedFormat )
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Broadcasting webcam stream with RTSP

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Edited by: lunaticTR on Oct 2, 2009 3:01 PM

As far as I am aware (and I am aware of most but not all), JMF doesn't support RTSP broadcast, only RTSP reception.
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Here is the source code to JMF Webcam app + saves jpeg

Since so many people ask for this code, but never get it, I figured I'd repost it. I didn't write it, but I added the jpeg saving part, and modified it for my device, which you will have to do to get it to work. Just go into JMFRegistry and get the device name from your webcam and then edit the code. Also, keep in mind that some webcams don't work with JMF. You have to have a webcam that supports VFW or WDM interface.
And here's the code:
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.media.control.*;
import javax.media.protocol.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
public class SwingCapture extends Panel implements ActionListener
public static Player player = null;
public CaptureDeviceInfo di = null;
public MediaLocator ml = null;
public JButton capture = null;
public Buffer buf = null;
public Image img = null;
public VideoFormat vf = null;
public BufferToImage btoi = null;
public ImagePanel imgpanel = null;
public SwingCapture()
    setLayout(new BorderLayout());
    setSize(320,550);
    imgpanel = new ImagePanel();
    capture = new JButton("Capture");
    capture.addActionListener(this);
    String str1 = "vfw:Logitech USB Video Camera:0";
    String str2 = "vfw:Microsoft WDM Image Capture (Win32):0";
    di = CaptureDeviceManager.getDevice(str2);
    ml = di.getLocator();
    try
      player = Manager.createRealizedPlayer(ml);
      player.start();
      Component comp;
      if ((comp = player.getVisualComponent()) != null)
        add(comp,BorderLayout.NORTH);
      add(capture,BorderLayout.CENTER);
      add(imgpanel,BorderLayout.SOUTH);
    catch (Exception e)
      e.printStackTrace();
public static void main(String[] args)
    Frame f = new Frame("SwingCapture");
    SwingCapture cf = new SwingCapture();
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
      playerclose();
      System.exit(0);}});
    f.add("Center",cf);
    f.pack();
    f.setSize(new Dimension(320,550));
    f.setVisible(true);
public static void playerclose()
    player.close();
    player.deallocate();
public void actionPerformed(ActionEvent e)
    JComponent c = (JComponent) e.getSource();
    if (c == capture)
      // Grab a frame
      FrameGrabbingControl fgc = (FrameGrabbingControl)
      player.getControl("javax.media.control.FrameGrabbingControl");
      buf = fgc.grabFrame();
      // Convert it to an image
      btoi = new BufferToImage((VideoFormat)buf.getFormat());
      img = btoi.createImage(buf);
      // show the image
      imgpanel.setImage(img);
      // save image
      saveJPG(img,"c:\\test.jpg");
class ImagePanel extends Panel
    public Image myimg = null;
    public ImagePanel()
      setLayout(null);
      setSize(320,240);
    public void setImage(Image img)
      this.myimg = img;
      repaint();
    public void paint(Graphics g)
      if (myimg != null)
        g.drawImage(myimg, 0, 0, this);
public static void saveJPG(Image img, String s)
    BufferedImage bi = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = bi.createGraphics();
    g2.drawImage(img, null, null);
    FileOutputStream out = null;
    try
      out = new FileOutputStream(s);
    catch (java.io.FileNotFoundException io)
      System.out.println("File Not Found");
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
    JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
    param.setQuality(0.5f,false);
    encoder.setJPEGEncodeParam(param);
    try
      encoder.encode(bi);
      out.close();
    catch (java.io.IOException io)
      System.out.println("IOException");

Hi William,
I've tried this code but I always get an null fgc with the following line.
FrameGrabbingControl fgc = (FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingCotrol");
So the player returns always null. The other thigns seem to be fine. I can view the image in the application but when I click capture it throws a Null Pointer Exception because fgc is null.
I am using Logitech QuickCam, USB, Win2k, jdk 1.3.1, JMF 2.1.1
Can you help me?
thanx,
Philip
Since so many people ask for this code, but never get
it, I figured I'd repost it. I didn't write it, but I
added the jpeg saving part, and modified it for my
device, which you will have to do to get it to work.
Just go into JMFRegistry and get the device name from
your webcam and then edit the code. Also, keep in mind
that some webcams don't work with JMF. You have to
have a webcam that supports VFW or WDM interface.
And here's the code:
import javax.swing.*;
import javax.swing.event.*;
import java.io.*;
import javax.media.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.media.control.*;
import javax.media.protocol.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
public class SwingCapture extends Panel implements
ActionListener
public static Player player = null;
public CaptureDeviceInfo di = null;
public MediaLocator ml = null;
public JButton capture = null;
public Buffer buf = null;
public Image img = null;
public VideoFormat vf = null;
public BufferToImage btoi = null;
public ImagePanel imgpanel = null;
public SwingCapture()
setLayout(new BorderLayout());
setSize(320,550);
imgpanel = new ImagePanel();
capture = new JButton("Capture");
capture.addActionListener(this);
String str1 = "vfw:Logitech USB Video Camera:0";
String str2 = "vfw:Microsoft WDM Image Capture
ure (Win32):0";
di = CaptureDeviceManager.getDevice(str2);
ml = di.getLocator();
try
player = Manager.createRealizedPlayer(ml);
player.start();
Component comp;
if ((comp = player.getVisualComponent()) !=
)) != null)
add(comp,BorderLayout.NORTH);
add(capture,BorderLayout.CENTER);
add(imgpanel,BorderLayout.SOUTH);
catch (Exception e)
e.printStackTrace();
public static void main(String[] args)
Frame f = new Frame("SwingCapture");
SwingCapture cf = new SwingCapture();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
playerclose();
System.exit(0);}});
f.add("Center",cf);
f.pack();
f.setSize(new Dimension(320,550));
f.setVisible(true);
public static void playerclose()
player.close();
player.deallocate();
public void actionPerformed(ActionEvent e)
JComponent c = (JComponent) e.getSource();
if (c == capture)
// Grab a frame
FrameGrabbingControl fgc =
fgc = (FrameGrabbingControl)
player.getControl("javax.media.control.FrameGrabbingCo
trol");
buf = fgc.grabFrame();
// Convert it to an image
btoi = new
= new BufferToImage((VideoFormat)buf.getFormat());
img = btoi.createImage(buf);
// show the image
imgpanel.setImage(img);
// save image
saveJPG(img,"c:\\test.jpg");
class ImagePanel extends Panel
public Image myimg = null;
public ImagePanel()
setLayout(null);
setSize(320,240);
public void setImage(Image img)
this.myimg = img;
repaint();
public void paint(Graphics g)
if (myimg != null)
g.drawImage(myimg, 0, 0, this);
public static void saveJPG(Image img, String s)
BufferedImage bi = new
new BufferedImage(img.getWidth(null),
img.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bi.createGraphics();
g2.drawImage(img, null, null);
FileOutputStream out = null;
try
out = new FileOutputStream(s);
catch (java.io.FileNotFoundException io)
System.out.println("File Not Found");
JPEGImageEncoder encoder =
r = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param =
m = encoder.getDefaultJPEGEncodeParam(bi);
param.setQuality(0.5f,false);
encoder.setJPEGEncodeParam(param);
try
encoder.encode(bi);
out.close();
catch (java.io.IOException io)
System.out.println("IOException");

WVC80N - Can't get the camera to stream externally

Hello experts!
I recently bought 3 WVC80n cameras to set up in my house. For now, I just want to be able to connect to the cameras through my iPhone using my IP address (which is not static, I know, I'll deal with that issue). I want to type: http://xxx.xxx.xxx.xxx:8081 and see my Camera1. In a few weeks I'll get around to linking the three cameras to my website, but I simply refuse to use TZO to do this... but that's for another thread on another day!
Right now I have the cameras set up wirelessly and they are working for internal broadcast. However, when I try to connect using my external IP, I get no connection.
Here is my setup:
- 3x WVC80N Wireless Cameras
- 1x Windows 7 64-bit desktop
- 1x Motorola SBG900 wireless cable modem/router
These are the static internal IP addresses I have set up, with their corresponding port number:
192.168.0.20 8081
192.168.0.21 8082
192.168.0.22 8083
Mobile streaming is enabled, UPnP is enabled, Alternate Web Access Port enabled, with 8081 (or 8082, 8083 for the other cameras) as the listed port, RTSP is 554 for all three cameras, RTP Data Port is 5000 for all three cameras.
These are the settings on my router:
- Firewall disabled
- Cam1 Port forwarding: 8081:8081 to 192.168.0.20
- Cam2 Port forwarding: 8082:8082 to 192.168.0.21
- Cam3 Port forwarding: 8083:8083 to 192.168.0.22
I have read dozens of posts and articles where people say you need to forward the RTSP and RTP Data Ports, add your cameras to the DMZ, etc, etc, etc
I feel I have tried every iteration of these recommendations and port forwarding options, settings, etc, all to no avail.
Any guidance would be very much appreciated,
Daniel

I have a motorola SBG900 wireless router/modem combo. Comcast cable is my ISP.
The problem with other DynDNS programs is that the cameras I have only allow you to select TZO as the provider. There is no option for another DynDNS provider.. so at best, I would have to do a long manual setup and have a program on my desktop that notifies the DynDNS server that my IP has changed.. The camera won't do it automatically. So if my computer is snoozing and I'm out of town, I won't be able to see what trouble my cats are getting into.
Frustrating!
I may just go ahead and pay for the stupid TZO service...

How can I decode a data stream to jpeg image?

Hi
I am using the tranfered jpeg-data stream of a scanner module which I need to decode and display as an image on my vi.
Question:
With which method i can do that on the fly?
or
do I need to save the data stream (string) first to decode it afterwards with the "Read JPEG file.vi"? If so, how do I save the data in the correct way in the way that LabView can read it?
thanks in advance
Norick
Solved!
Go to Solution.

For Windows I use .NET to do this type of conversion without resorting to writing temporary files. This VI will convert most formats (bmp,jpg,gif,tif) to a PNG string and then you can use the native PNG data to LV image VI. Why they do not provide string based versions for all image formats is beyond me (idea perhaps?).
Attachments:
StringToImage.vi ‏33 KB

Webcam Stream (External JPEG)

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