Play video from memory/cache
Hi All,
Is it possible to play video from memory or cache? I trying to build a video player. And I am using NetStream.play(). It can play a local file, but how can I load the a file into memory first, do some modification, and then play it?
Thanks a lot!
If you mean "can I play a video file's video part via AppleTV and the audio part via the Macbook" then the answer is no.
You could probably play the video on AppleTv and also play it on the Macbook and output the audio, but you would have to do this manually, and 2 applications accessing the same video file might cause stuttering playback issues. Additionally you'd have to manually sync the audio and lip sync problems are annoying at the best of times.
If you mean "can I watch a video from AppleTV and play separate music via iTunes on the Macbook", then the answer is yes.
AC
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Playing video from a capture device - Out of memory for video buffers?
Hello guys, I'm having problems playing video from a video capture device when not using JMStudio. When I use JMStudio, the video plays real time with no problems, but when I use code taken from a java book which is a simple Media Player, I get the following error:
"Error is Error: Out of memory for video buffers."
My capture device is working and I don't know why i get this error when trying to watch the video feed from a program other than JMStudio. I also tried different code that has worked in the past with the same exact capture device and I still get the same error. Please help, I have no clue at this point. The code for the simple media player is below, it's taken out of the book "Java: How to Program (4th edition)":
Thanks in advance, I am very greatful
Miguel
device info: vfw:Microsoft WDM Image Capture (Win32):0
When I type the locator, I am typing vfw://0, I also tried just vfw://
and I get the same error.
// Fig. 22.1: SimplePlayer.java
// Opens and plays a media file from
// local computer, public URL, or an RTP session
// Java core packages
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.media.*;
public class SimplePlayer extends JFrame {
// Java media player
private Player player;
// visual content component
private Component visualMedia;
// controls component for media
private Component mediaControl;
// main container
private Container container;
// media file and media locations
private File mediaFile;
private URL fileURL;
// constructor for SimplePlayer
public SimplePlayer()
super( "Simple Java Media Player" );
container = getContentPane();
// panel containing buttons
JPanel buttonPanel = new JPanel();
container.add( buttonPanel, BorderLayout.NORTH );
// opening file from directory button
JButton openFile = new JButton( "Open File" );
buttonPanel.add( openFile );
// register an ActionListener for openFile events
openFile.addActionListener(
// anonymous inner class to handle openFile events
new ActionListener() {
// open and create player for file
public void actionPerformed( ActionEvent event )
mediaFile = getFile();
if ( mediaFile != null ) {
// obtain URL from file
try {
fileURL = mediaFile.toURL();
// file path unresolvable
catch ( MalformedURLException badURL ) {
badURL.printStackTrace();
showErrorMessage( "Bad URL" );
makePlayer( fileURL.toString() );
} // end actionPerformed
} // end ActionListener
); // end call to method addActionListener
// URL opening button
JButton openURL = new JButton( "Open Locator" );
buttonPanel.add( openURL );
// register an ActionListener for openURL events
openURL.addActionListener(
// anonymous inner class to handle openURL events
new ActionListener() {
// open and create player for media locator
public void actionPerformed( ActionEvent event )
String addressName = getMediaLocation();
if ( addressName != null )
makePlayer( addressName );
} // end ActionListener
); // end call to method addActionListener
// turn on lightweight rendering on players to enable
// better compatibility with lightweight GUI components
Manager.setHint( Manager.LIGHTWEIGHT_RENDERER,
Boolean.TRUE );
} // end SimplePlayer constructor
// utility method for pop-up error messages
public void showErrorMessage( String error )
JOptionPane.showMessageDialog( this, error, "Error",
JOptionPane.ERROR_MESSAGE );
// get file from computer
public File getFile()
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(
JFileChooser.FILES_ONLY );
int result = fileChooser.showOpenDialog( this );
if ( result == JFileChooser.CANCEL_OPTION )
return null;
else
return fileChooser.getSelectedFile();
// get media location from user input
public String getMediaLocation()
String input = JOptionPane.showInputDialog(
this, "Enter URL" );
// if user presses OK with no input
if ( input != null && input.length() == 0 )
return null;
return input;
// create player using media's location
public void makePlayer( String mediaLocation )
// reset player and window if previous player exists
if ( player != null )
removePlayerComponents();
// location of media source
MediaLocator mediaLocator =
new MediaLocator( mediaLocation );
if ( mediaLocator == null ) {
showErrorMessage( "Error opening file" );
return;
// create a player from MediaLocator
try {
player = Manager.createPlayer( mediaLocator );
// register ControllerListener to handle Player events
player.addControllerListener(
new PlayerEventHandler() );
// call realize to enable rendering of player's media
player.realize();
// no player exists or format is unsupported
catch ( NoPlayerException noPlayerException ) {
noPlayerException.printStackTrace();
// file input error
catch ( IOException ioException ) {
ioException.printStackTrace();
} // end makePlayer method
// return player to system resources and
// reset media and controls
public void removePlayerComponents()
// remove previous video component if there is one
if ( visualMedia != null )
container.remove( visualMedia );
// remove previous media control if there is one
if ( mediaControl != null )
container.remove( mediaControl );
// stop player and return allocated resources
player.close();
// obtain visual media and player controls
public void getMediaComponents()
// get visual component from player
visualMedia = player.getVisualComponent();
// add visual component if present
if ( visualMedia != null )
container.add( visualMedia, BorderLayout.CENTER );
// get player control GUI
mediaControl = player.getControlPanelComponent();
// add controls component if present
if ( mediaControl != null )
container.add( mediaControl, BorderLayout.SOUTH );
} // end method getMediaComponents
// handler for player's ControllerEvents
private class PlayerEventHandler extends ControllerAdapter {
// prefetch media feed once player is realized
public void realizeComplete(
RealizeCompleteEvent realizeDoneEvent )
player.prefetch();
// player can start showing media after prefetching
public void prefetchComplete(
PrefetchCompleteEvent prefetchDoneEvent )
getMediaComponents();
// ensure valid layout of frame
validate();
// start playing media
player.start();
} // end prefetchComplete method
// if end of media, reset to beginning, stop play
public void endOfMedia( EndOfMediaEvent mediaEndEvent )
player.setMediaTime( new Time( 0 ) );
player.stop();
} // end PlayerEventHandler inner class
// execute application
public static void main( String args[] )
SimplePlayer testPlayer = new SimplePlayer();
testPlayer.setSize( 300, 300 );
testPlayer.setLocation( 300, 300 );
testPlayer.setDefaultCloseOperation( EXIT_ON_CLOSE );
testPlayer.setVisible( true );
} // end class SimplePlayersomebody? anybody? I know there are some JMF professionals in here, any ideas?
I was reading the Sun documentation and it said something about increasing the JVM memory buffer or something? Well, i'm just clueless at this point.
Help a brotha out! -
urgent
i need to play an mpg file from a jar file but the Manager.createPlayer now only Url object
is there any other way to play video from InputStream?You may want to take a look at this:
http://www.extollit.com/isdsjmf.php
I developed a similar implementation of this for a client and it works fine. It's based on using a sequential InputStream as a DataSource for the media player. As you may already know, the Java Media Framework does not seem to support URLDataSource and/or sequential InputStreams.
This code allows you to play media from nothing more than an InputStream without downloading it all into memory or to a local file. It uses a ringbuffer as a compromise along with some other enhancements. -
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Clinton -
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