A simple media player problem

Question

Hi there,
The following code is a simple media player applet. Now I try to change it to an application.
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.lang.String;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;
import java.util.Properties;
import javax.media.*;
public class SimplePlayerApplet extends Applet implements ControllerListener {
// media Player
Player player = null;
// component in which video is playing
Component visualComponent = null;
// controls gain, position, start, stop
Component controlComponent = null;
// displays progress during download
Component progressBar = null;
boolean firstTime = true;
long CachingSize = 0L;
Panel panel = null;
int controlPanelHeight = 0;
int videoWidth = 0;
int videoHeight = 0;
* Read the applet file parameter and create the media
* player.
public void init() {
          //$ System.out.println("Applet.init() is called");
          setLayout(null);
          setBackground(Color.white);
          panel = new Panel();
          panel.setLayout( null );
          add(panel);
          panel.setBounds(0, 0, 320, 240);
          // input file name from html param
          String mediaFile = null;
          // URL for our media file
          MediaLocator mrl = null;
          URL url = null;
          // Get the media filename info.
          // The applet tag should contain the path to the
          // source media file, relative to the html page.
          if ((mediaFile = getParameter("FILE")) == null)
          Fatal("Invalid media file parameter");
          try {
          url = new URL(getDocumentBase(), mediaFile);
          mediaFile = url.toExternalForm();
          } catch (MalformedURLException mue) {
          try {
          // Create a media locator from the file name
          if ((mrl = new MediaLocator(mediaFile)) == null)
               Fatal("Can't build URL for " + mediaFile);
          // Create an instance of a player for this media
          try {
                    player = Manager.createPlayer(mrl);
          } catch (NoPlayerException e) {
                    System.out.println(e);
                    Fatal("Could not create player for " + mrl);
          // Add ourselves as a listener for a player's events
          player.addControllerListener(this);
          } catch (MalformedURLException e) {
          Fatal("Invalid media file URL!");
          } catch (IOException e) {
          Fatal("IO exception creating player for " + mrl);
* Start media file playback. This function is called the
* first time that the Applet runs and every
* time the user re-enters the page.
public void start() {
     //$ System.out.println("Applet.start() is called");
// Call start() to prefetch and start the player.
if (player != null)
     player.start();
* Stop media file playback and release resource before
* leaving the page.
public void stop() {
     //$ System.out.println("Applet.stop() is called");
if (player != null) {
player.stop();
player.deallocate();
public void destroy() {
     //$ System.out.println("Applet.destroy() is called");
          player.close();
* This controllerUpdate function must be defined in order to
* implement a ControllerListener interface. This
* function will be called whenever there is a media event
public synchronized void controllerUpdate(ControllerEvent event) {
     // If we're getting messages from a dead player,
     // just leave
     if (player == null)
     return;
     // When the player is Realized, get the visual
     // and control components and add them to the Applet
     if (event instanceof RealizeCompleteEvent) {
     if (progressBar != null) {
               panel.remove(progressBar);
               progressBar = null;
     int width = 320;
     int height = 0;
     if (controlComponent == null)
          if (( controlComponent =
          player.getControlPanelComponent()) != null) {
          controlPanelHeight = controlComponent.getPreferredSize().height;
          panel.add(controlComponent);
          height += controlPanelHeight;
     if (visualComponent == null)
          if (( visualComponent =
          player.getVisualComponent())!= null) {
          panel.add(visualComponent);
          Dimension videoSize = visualComponent.getPreferredSize();
          videoWidth = videoSize.width;
          videoHeight = videoSize.height;
          width = videoWidth;
          height += videoHeight;
          visualComponent.setBounds(0, 0, videoWidth, videoHeight);
     panel.setBounds(0, 0, width, height);
     if (controlComponent != null) {
               controlComponent.setBounds(0, videoHeight,
                         width, controlPanelHeight);
               controlComponent.invalidate();
     } else if (event instanceof CachingControlEvent) {
     if (player.getState() > Controller.Realizing)
               return;
     // Put a progress bar up when downloading starts,
     // take it down when downloading ends.
     CachingControlEvent e = (CachingControlEvent) event;
     CachingControl cc = e.getCachingControl();
     // Add the bar if not already there ...
     if (progressBar == null) {
     if ((progressBar = cc.getControlComponent()) != null) {
          panel.add(progressBar);
          panel.setSize(progressBar.getPreferredSize());
          validate();
     } else if (event instanceof EndOfMediaEvent) {
     // We've reached the end of the media; rewind and
     // start over
     player.setMediaTime(new Time(0));
     player.start();
     } else if (event instanceof ControllerErrorEvent) {
     // Tell TypicalPlayerApplet.start() to call it a day
     player = null;
     Fatal(((ControllerErrorEvent)event).getMessage());
} else if (event instanceof ControllerClosedEvent) {
     panel.removeAll();
void Fatal (String s) {
     // Applications will make various choices about what
     // to do here. We print a message
          System.err.println("FATAL ERROR: " + s);
          throw new Error(s); // Invoke the uncaught exception
               // handler System.exit() is another
               // choice.
The change I've made:
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.lang.String;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;
import java.util.Properties;
import javax.media.*;
import javax.swing.*;
public class MoviePlayer extends JFrame implements ControllerListener {
// media Player
Player player = null;
// component in which video is playing
Component visualComponent = null;
// controls gain, position, start, stop
Component controlComponent = null;
// displays progress during download
Component progressBar = null;
boolean firstTime = true;
long CachingSize = 0L;
JPanel panel = null;
int controlPanelHeight = 0;
int videoWidth = 0;
int videoHeight = 0;
* Read the applet file parameter and create the media
* player.
public MoviePlayer() {
     FlowLayout layout = new FlowLayout();
          setTitle("Media Application");
          setDefaultLookAndFeelDecorated(true);
          Container mainWindow = getContentPane();
     //$ System.out.println("Applet.init() is called");
          setBackground(Color.white);
          panel = new JPanel();
          panel.setBounds(0, 0, 320, 240);
          mainWindow.add(panel);
          // input file name from html param
          String mediaFile = null;
          // URL for our media file
          MediaLocator mrl = null;
          URL url = null;
          // Get the media filename info.
          // The applet tag should contain the path to the
          // source media file, relative to the html page.
          mediaFile = "abc.avi";
          try {
          url = new URL(mediaFile);
          mediaFile = url.toExternalForm();
          } catch (MalformedURLException mue) {
          try {
          // Create a media locator from the file name
          if ((mrl = new MediaLocator(mediaFile)) == null)
                    Fatal("Can't build URL for " + mediaFile);
          // Create an instance of a player for this media
          try {
                    player = Manager.createPlayer(mrl);
          } catch (NoPlayerException e) {
                    System.out.println(e);
                    Fatal("Could not create player for " + mrl);
          // Add ourselves as a listener for a player's events
          player.addControllerListener(this);
          } catch (MalformedURLException e) {
          Fatal("Invalid media file URL!");
          } catch (IOException e) {
          Fatal("IO exception creating player for " + mrl);
* Start media file playback. This function is called the
* first time that the Applet runs and every
* time the user re-enters the page.
public void start() {
     //$ System.out.println("Applet.start() is called");
// Call start() to prefetch and start the player.
if (player != null)
     player.start();
* Stop media file playback and release resource before
* leaving the page.
public void stop() {
     //$ System.out.println("Applet.stop() is called");
if (player != null) {
player.stop();
player.deallocate();
public void destroy() {
     //$ System.out.println("Applet.destroy() is called");
          player.close();
* This controllerUpdate function must be defined in order to
* implement a ControllerListener interface. This
* function will be called whenever there is a media event
public synchronized void controllerUpdate(ControllerEvent event) {
     // If we're getting messages from a dead player,
     // just leave
     if (player == null)
     return;
     // When the player is Realized, get the visual
     // and control components and add them to the Applet
     if (event instanceof RealizeCompleteEvent) {
     if (progressBar != null) {
               panel.remove(progressBar);
               progressBar = null;
     int width = 320;
     int height = 0;
     if (controlComponent == null)
          if (( controlComponent =
          player.getControlPanelComponent()) != null) {
          controlPanelHeight = controlComponent.getPreferredSize().height;
          panel.add(controlComponent);
          height += controlPanelHeight;
     if (visualComponent == null)
          if (( visualComponent =
          player.getVisualComponent())!= null) {
          panel.add(visualComponent);
          Dimension videoSize = visualComponent.getPreferredSize();
          videoWidth = videoSize.width;
          videoHeight = videoSize.height;
          width = videoWidth;
          height += videoHeight;
          visualComponent.setBounds(0, 0, videoWidth, videoHeight);
     panel.setBounds(0, 0, width, height);
     if (controlComponent != null) {
               controlComponent.setBounds(0, videoHeight,
                         width, controlPanelHeight);
               controlComponent.invalidate();
     } else if (event instanceof CachingControlEvent) {
     if (player.getState() > Controller.Realizing)
               return;
     // Put a progress bar up when downloading starts,
     // take it down when downloading ends.
     CachingControlEvent e = (CachingControlEvent) event;
     CachingControl cc = e.getCachingControl();
     // Add the bar if not already there ...
     if (progressBar == null) {
     if ((progressBar = cc.getControlComponent()) != null) {
               panel.add(progressBar);
               panel.setSize(progressBar.getPreferredSize());
               validate();
     } else if (event instanceof EndOfMediaEvent) {
     // We've reached the end of the media; rewind and
     // start over
     player.setMediaTime(new Time(0));
     player.start();
     } else if (event instanceof ControllerErrorEvent) {
     // Tell TypicalPlayerApplet.start() to call it a day
     player = null;
     Fatal(((ControllerErrorEvent)event).getMessage());
} else if (event instanceof ControllerClosedEvent) {
     panel.removeAll();
void Fatal (String s) {
     // Applications will make various choices about what
     // to do here. We print a message
          System.err.println("FATAL ERROR: " + s);
          throw new Error(s); // Invoke the uncaught exception
               // handler System.exit() is another
               // choice.
public static void main(String[] args){
     MoviePlayer view = new MoviePlayer();
          view.setSize(600,250);
          view.setVisible(true);
          view.addWindowListener(new WindowAdapter () {
               public void windowClosing (WindowEvent e) {
                    System.exit(0);
It does compile, but when I run it, it prints the following error message:
javax.media.NoPlayerException: Cannot find a Player for :abc.avi
FATAL ERROR: Could not create player for abc.avi
Exception in thread "main" java.lang.Error: Could not create player for abc.avi
at MoviePlayer.Fatal(MoviePlayer.java:257)
at MoviePlayer.<init>(MoviePlayer.java:123)
at MoviePlayer.main(MoviePlayer.java:263)
Press any key to continue...
Any advice?
Thank you

Answer 1

Hi,
That is due to the way MediaLocator excepts the filename to be formed. add the following line:
// Get the media filename info.
// The applet tag should contain the path to the
// source media file, relative to the html page.
mediaFile = "abc.avi";
//HERE'S THE LINE YOU NEED TO ADD
if ( mediaFile.indexOf( ":" ) < 3 ) mediaFile = "file:" + mediaFile;It formats the filename properly. Also make sure the abc.avi file is in the current directory.