Technology And Life

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Information about Technology And Life

Published on May 24, 2008

Author: sunil



Tech Tutorials, Tech Resources, Tech Articles

Saturday, May 24, 2008 09:24 GMT Technology Makes Life Easier Technology makes life easier Flash Player 10 Out With New Audio And Video Features In a prerelease of Adobe Flash Player 10 code name quot;Astroquot;, the noticable features are audio and video features which will be available with proposed future release of Adobe Flash Media Server. Dynamic Streaming As streaming is dependent on newtwork condition, Dynamic Streaming will provide best quality video and will be auto adjustable based on bandwidth availability. Video streams over RTMP from proposed future releases of Flash Media Server can dynamically change bitrate as network conditions change. RTMFP (Real Time Media Flow Protocol) According to Adobe- RTMFP provides a UDP-based secure network transport alternative to RTMP-over-TCP. To take advantage of the feature you will need to establish a net connection via future releases of Flash Media Server or other Adobe server products. UDP (User Datagram Protocol) is an efficient and standardized Internet protocol for delivering media assets because of its support for lossy delivery, improving performance of real time communication. RTMFP is always encrypted which helps protect media delivery. This technology is a result of Adobe's acquisition of Amicima, Inc. in 2006. UDP Streaming. What would be the reaction of Red5 team? Speex Audio Codec The new, higher fidelity Speex voice codec that delivers the lowest-latency audio experience. The complete feature list is here. Reference:- Adobe Flash® Player 10 beta 360 Degree Interactive Video And Future Of Flash Player And FMS Saturday, May 24, 2008 09:24 GMT / Created by Page 1 of 30

Today, I read two interesting blog posts quot;360 Degree Interactive Videoquot; and quot;Multibitrate Support Coming to Flash Player and FMS (?)quot; written by Stefan Richter from talking about 360 degree interactive video served by flash and possible upcoming features in flash player and FMS. 360 degree videos from Immersive Media are looking very impressive. Just drag your mouse on any direction you want to view within the video once it starts playing. More videos are here at - Here is the video where kevin Towers shows how Flash Media Interactive Server, Flash Media Streaming Server and Flash Media Rights Managment Server are leading the way in the protection and streaming of digital video today. Reference:- 360 Degree Interactive Video Multibitrate Support Coming to Flash Player and FMS (?) Adobe at NAB 2008- Flash Media Server Open Dialect -An Open Source Flash IDE Now Supports Linux Few days back, I wrote about an interesting application called Open Dialect, a free open source flash IDE written in C# using .Net 2.0 framework. In my previous post, I mentioned that OpenDialect team is porting this application on Linux too. Today they have announced the release of Open Dialect 0.2.0 (Linux/Windows Flash IDE). Open Dialect 0.2.0 supports .SWF creation and testing on Linux and Windows, with partial support for OS X 10.5. You can check Open Dialect in action here at- To know more about this release or Open Dialect, follow the links in reference. Reference:- Open Dialect, Open source alternate of flash IDE About Open Dialect Open Dialect on Osflash Screenshots Open Dialect - Open source Flash IDE Saturday, May 24, 2008 09:24 GMT / Created by Page 2 of 30

Open Dialect is an open source Flash IDE based on Flex. It's written in C# using .Net 2.0 framework. They call it Dynamic Inter-Active Learning Environment Creation Tool. The software is meant for creating interactive learning Environments. To know in detail about the this open source flash IDE, Follow the Open Dialect wiki here. Below is the screenshot of open Dialect IDE. More screenshots are available here. Open Dialect 0.1.1 is available for Windows but they are porting it on Linux and OSX using MONO and GTK+. The available demo for showing the capabilities of Open Dialect is here. References:- Open Dialect Open Dialect HomePage Open Dialect Main Website RTMP - Protocol Flavours Saturday, May 24, 2008 09:24 GMT / Created by Page 3 of 30

With the development of Adobe flash media server and Red5 flash server new protocols are also coming in picture. Here are some protocols for streaming of Audio/Video using Flash media server and Red5. RTMP Real Time Messaging Protocol RTMP is a TCP based propriety protocol developed by Adobe System for the purpose of streaming Audio/Video data between Flash Player and media server. RTMPT Real Time Messaging Protocol with Tunnel RTMPT is a variation of RTMP which works behind the firewall as well. It works on Port 80 and encapsulate the RTMP data in HTTP request. RTMPS Real Time Messaging Protocol Secure RTMPS is again a variation of RTMP which works over secure HTTPS connection. RTMPE Real Time Messaging Protocol with Encryption RTMPE is a new 128 bit encrypted protocol developed by Adobe systems for securing the stream data between flash client and server. It's lightweight than SSL. It's a DRM solution from Adobe for flash. RTMPTE Real Time Messaging Protocol with Encryption and Tunnel RTMPTE is a RTMPE tunneling over HTTP on port 80. MRTMP Multiplex Real Time Messaging protocol Multiplex RTMP is a protocol between edge and origin, developed by Red5 for clustering of stream data using Terracotta. Related Post H.264 On RTMP Adobe Flash Media Rights Management Server Saturday, May 24, 2008 09:24 GMT / Created by Page 4 of 30

Adobe has relased Adobe Flash Media Rights Managment server. It's a platform to protect the media contents delivered to Adobe Media Player and Adobe AIR? applications. It's a DRM( Digital Rights Managment ) solution for Flash Video. Some of the features of Adobe Flash Media Rights Managment server are listed below- Cross-platform content delivery Protect media content delivered to Adobe® Media Player and Adobe AIR? applications. Content protection with Adobe Media Player ensure the integrity of your content when you deliver it to Adobe Media Player users. Offline access auditing Track usage of your content when viewed through Adobe Media Player, even when consumers are offline. For detail list of features, visit Adobe website here. To know in detail about this new server follow the article of Tim Siglin here. References:- Adobe Flash Media Rights Management Server Adobe Offers DRM for Flash Video with Flash Media Rights Management Server Flash Media Rights Management Server Announced (and Released) Red5 0.7.0 complete Changelog and Bugfixes Saturday, May 24, 2008 09:24 GMT / Created by Page 5 of 30

Red5 Changelog ---------------------------------------------------------- Red5 v0.7.0 final 02.23.2008 New Features: - Initial Edge/Origin clustering support for multiple Edges with a single Origin (Jira APPSERVER-66) - Added stream listeners that can get notified about received packets - Support for server-side Javascript (Jira APPSERVER-169) - Added new base class org.red5.server.adapter.MultiThreadedApplicationAdapter that allows multiple clients to connect simultaneously to the same application - Added new Flash Player 9 statuses NetStream.Play.FileStructureInvalid and NetStream.Play.NoSupportedTrackFound - New Flex admin tool (Jira APPSERVER-242) Bugfixes: - Pause near end of buffered streams works as expected (Jira APPSERVER-199) - Fixed potential memory leak with RTMPT connections that are not properly closed (Jira APPSERVER-193) - quot;onMetaDataquot; is only written to newly recorded FLV files and contains valid properties now - Don't try to decode objects for closed RTMPT connections (Jira APPSERVER-208) - New multi-threaded connection code fixes various timeout issues (Jira APPSERVER-122, Jira APPSERVER-166 and Jira APPSERVER-167) - Always use correct classloader inside applications (Jira APPSERVER-200) - Tomcat cannot undeploy red5 application (Jira APPSERVER-204) - quot;ByteArrayquot; objects used old data after calling quot;compressquot; or quot;uncompressquot; (Jira APPSERVER-211) - quot;@DontSerializequot; checks for properties also in inherited classes (Jira APPSERVER-225) - Enabled bidirectional class serialization (Jira APPSERVER-219) - Array typed parameters in remoting service methods converted properly (Jira APPSERVER-161) References:- Terracotta - Network Attached Memory Saturday, May 24, 2008 09:24 GMT / Created by Page 6 of 30

Another great software from open source. Few days back I wrote here about Red5 load balancing using Terracotta . In this post I will write little bit about Terracotta technology. Terracotta is an open source JVM clustering software for Java.It means the applications running on multiple JVMs are capable to interact with each other as they are running on a same JVM. They call it- Network Attached Memory: Purpose Built To Store quot;Scratch Dataquot;. Terracotta is useful in following scenarios:- 1:- HTTP Session Clustering 2:- Distributed Caching 3:- POJO Clustering/Spring integration 4:- Hibernate Caching 5:- Inter-JVM Coordination 6:- Collaboration, Coordination and Events 7:- Distributed workload distribution 8:- Virtual heap for large dataset To know more about Terracotta follow the link here or watch very impressive demo here. References:- 1:- Terracotta official website 2:- Terracotta Wiki 3:- Introduction to Terracotta with Example 4:- Terracotta Tech- Cluster your JVM- The Video 5:- Using Terracotta To Cluster a Single JVM Master/Worker Application H.264 on RTMP Saturday, May 24, 2008 09:24 GMT / Created by Page 7 of 30

Today morning i got a news here on red5 mailing list about the implementation of H.264 on RTMP by a Japanese guy. The blog is in Japanese. Below are the links for detail information on this. Feed Demo Page (English compatible click once to enable audio) Programmer's blog (written in Japanese) Demo Video on Server Start Now its time for Red5 team to comeup with H.264 solution. Hope to hear it soon :) Red5 offline Tutorials-Download pdfs here Below is the offline version of many great Red5 tutorials so that you do not need to be online more to read them again. 1:- Create new Java Red5 application 2:- Setting up Eclipse for Red5 development 3:- Create sample Red5 application 4:- Shared whiteboard application in red5 5:- Secure your red5 application using stunnel 6:- Red5-How to create New application 7:- How to stream from custom directories 8:- Getting started with Red5 9:- MySql and Red5 10:- Red5 and Flex on windows 11:- Streaming and database connection- Red5 12:- Streaming from custom directories 13:- Tomcat guide of creating new Red5 application 14:- Red5+openlaszlo+Red5 15:- Red5 Project Roadmap 16:- Red5 Documentation 17:- Deploying Red5 to Tomcat MRTMP- Red5 load balancing Saturday, May 24, 2008 09:24 GMT / Created by Page 8 of 30

Red5 flash media server released their version 0.7.0 final on 02.23.2008. The one of the major enhancement was the support of Initial Edge/Origin clustering for multiple Edges with a single Origin. Everyone who was interested to use Red5 on a large scale was looking for this solution. I can find many questions in Red5 mailing list and other forums on this topic. For this red5 has developed a new protocol called MRTMP( Multiplexing RTMP)-protocol between edge and origin. They are using Terracotta for acheiving this solution. The detail architecture document can be found here and the implementation with Red5 and terracotta can be found here. The POC of Red5 and terracotta is here. After releasing this feature, Red5 team can target huge production environments and Chris Allen has already indicated about this on a post at flashcomguru. Looking forward for many new great features and enhancements in near future from Red5 team. Red5 ready for H.264 What is H.264 and why everyone now is talking about this only. Last year the online media giant YouTube also started showing H.264 contents.Flash media server 3 is supporting H.264 content both live and on demand. When we talk about FMS, one name also comes in mind and it's Red5, for those who can not go for FMS because of its price. Red5, for the people who live the open source way. When Red5 released the v0.7.0, I was discussing in my blog post about the possibility of supporting H.264 in near future by Red5 and few days back i read an article on Flashcomguru about Wowza media server supporting H.264. The link is here. I was sure that Red5 team is also working on it. Red5 team always keep doing great things right on time. So here is a statement from Chris Allen about Red5 supporting H.264 content in response to my comment on wowza supporting H.264 at flashcomguru. Correct, Red5, or more specifically, our team member Paul Gregoire is working on the h.264 support. This should be done pretty soon. We are releasing Red5 0.7 today or tomorrow, and the h.264 stuff will follow soon thereafter in 0.7.1 . So cheers for Red5, Everyone is waiting for Red5 v0.7.1. Great efforts from Red5 team. Red5 v0.7.0 final release Saturday, May 24, 2008 09:24 GMT / Created by Page 9 of 30

The Red5 team yesterday acheived one more milestone and they have now comeup with Red5 version 0.7.0 final.Here is the official announcement from Red5 website. Following are the major changes and known issues. Major changes since 0.6.3: 1. Initial Edge/Origin clustering support for multiple Edges with a single Origin New Flex admin tool. 2. Added a multi-threaded ApplicationAdapter that allows multiple clients to connect simultaneously to the same application. 3. Added stream listeners that can get notified about received packets. 4. Fixed a critical memory leak bug in networking due to MINA ExecutorFilter. 5. Added new Flash Player 9 statuses NetStream.Play.FileStructureInvalid and NetStream.Play.NoSupportedTrackFound. The detail of changes will be available with the installation of Red5. Known issues: The admin application may not work as expected. I am very eager to use this new version of Red5. It's another great acheivement from Red5 Team. Let?s hope Red5 community will come up with more critical improvements such as H.264 support soon References:- Red5 v0.7.0 final release Red5 official webpage Create new application with Red5 and Flash Microsoft buying Yahoo From so many days, I am listening about this MicroHoo word. Everybody is talking about this MicroHoo and many rumors started flowing in the air. Big surprise when i checked my favourite java forum . There also everyone is talking about who buying whom. I am also thinking of buying Microsoft :) Let see they accept my offer or not. By the way it's saturday night and i am going to sleep after thinking of this deal. AsUnit-- Open-source Unit Testing for Action Script 2.0 and 3.0 Saturday, May 24, 2008 09:24 GMT / Created by Page 10 of 30

Very recently i got a chance to work with AsUnit. We were looking for a testing framework for flash and after googling, we found this tool called AsUnit. It's an open source unit test framework for flash. Because of no documentation it was very hard to make it working for my first testing application. Most of the links given in this page point to does not exist pages on the web. After some more googling on this gave me some idea of how this works. Please find the reference of these websites from where i got some help to move forward with AsUnit at the end of this post.In this post i will explain a very simple application using AsUnit. AsUnit provides three ways to use their testing application in your application. 1. Framework 2. XUL UI 3. MXP In the below example we will use the first one i.e. Framework. To start with below example, you have to first download the Framework from here. It's a zip file. You can unzip this file in to your hard disk location. This will generate some folders named as2, as3, as3docs and as25. As clear from name, these folders are for different Actionscript versions. Since the below example is in Actionscript 3.0, we will use as3 folder. To start with the example, First create a folder say TestExample in any location of your hard disk. Copy this as3 folder to TestExample folder. Now it's time to create the sample application which we will test with AsUnit. Create a file named in the TestExample folder like this. package { public class Example { public function add(num1:Number,num2:Number):Number{ return num1 + num2; } } } Now its time to create test case for this class. Create a file named ExampleTest in the same folder like this. package { //The below line import the AsUnit library of TestCase import asunit.framework.TestCase; public class ExampleTest extends TestCase { //reference of Example class created above private var example:Example; public function ExampleTest(testMethod:String) { super(testMethod); } //Default method for object instantiation protected override function setUp():void { example = new Example(); } //Default method for Object deletion protected override function tearDown():void { Saturday, May 24, 2008 09:24 GMT / Created by Page 11 of 30

example = null; } public function testInstantiated():void { assertTrue(quot;Example instantiatedquot;, example is Example); } public function testFail():void { assertFalse(quot;failing testquot;, true); } /** * Test the add method of Example class created above */ public function testAdd():void { var result:Number = example.add(3,3); assertEquals(quot;Expected:6 Received:quot;+result, result, 6); } } } Now our test case is ready, Another thing we have to do is to create the TestSuite for executing many test cases together. Create a file named in the same folder like this. package { import asunit.framework.TestSuite; import ExampleTest; public class ExecuteAllTests extends TestSuite { public function ExecuteAllTests () { super(); //Adding first test addTest(new ExampleTest(quot;testInstantiatedquot;)); //Adding second test addTest(new ExampleTest(quot;testAddquot;)); } } } Till here we are ready with our main application, test case, test suite, Now we will create a runner class to run this test suite to produce some results. Create a file named in the same folder like this. package { import asunit.textui.TestRunner; public class ExampleTestRunner extends TestRunner { public function ExampleTestRunner() { start(ExecuteAllTests, null, TestRunner.SHOW_TRACE); } } Saturday, May 24, 2008 09:24 GMT / Created by Page 12 of 30

} As from the above structure you can see this runner class is taking our TestSuite class as a parameter and the last parameter is a boolean to show and hide the trace. Now it's time to run the application. For this create a flash file named ExampleTestRunner.fla in the same folder. This file will be empty file. Just you need to put ExampleTestRunner in Document class under properties tab. This step is to avoid the below error while compiling the fla file. TypeError: Error #1009: Cannot access a property or method of a null object reference. at asunit.textui::TestRunner/asunit.textui:TestRunner::addedHandler() at flash.display::DisplayObjectContainer/addChild() at asunit.textui::TestRunner/setPrinter() at asunit.textui::TestRunner/doRun() at asunit.textui::TestRunner/start() at ExampleTestRunner$iinit() at ExampleTestRunner_fla::MainTimeline/ExampleTestRunner_fla::frame1() The more detail on this can be found from the references given below. The below image will show how to use Document class in Flash CS3. Its time to run the flash file and see the result. Test the flash movie by hitting Ctrl+Enter. YOu will see a screen like this if everything goes fine. The above screen shows that both the tests are passed, Now go to file again and change this line assertEquals(quot;Expected:6 Received:quot;+result, result, 6); to assertEquals(quot;Expected:6 Received:quot;+result, result, 7); and again run the application, you will see a screen like this saying one test fail in two tests. References:- 1. AsUnit testing with Actionscript 3.0 and flash CS 3.0 2. AsUnit Step by Step 3. Migrating from flash 8 to flash CS3 4. AsUnit Step by Step part 1 pdf 5. AsUnit Step by Step part 2 pdf Back to Flex It was May 30, 2006 when i started writing here. The very first post i wrote about was the Flex( Introduction to flex data services). It's more than one and half year now and i am back again to flex. Last time i got very little chance to work with flex but i enjoyed alot. This time it's going to be more exciting and challenging. The work is great and interesting and i am ready to fight with flex again. Saturday, May 24, 2008 09:24 GMT / Created by Page 13 of 30 Limitations of flash Action Script 2.0 Very recently When i was working for a project based on Red5 flash server and Flash 8 with Action Script 2.0. My requirement was to fetch the number of images from the web server and render them on flash client repeatedly after n milliseconds. To avoid the flickering i used double buffering. But the problem was the time it was taking to load the images from server and then render them. I was using the MovieClipLoader loadClip function to dynamically load the jpeg files, Though the size of each jpeg was not more than 15 KB, but it was taking around 3-4 seconds to load 16 jpeg images of size less than 15 KB. This was very frustating as i was getting the updated images after 3-4 seconds. How good if flash provide some kind of sockets in Action script 2.0, by using that i can transfer the image object as binary data and then draw it on flash client.I am really missing this functionality in flash to send image data either using Flash remoting. They have kept it for their own product called Flash communication server.. I am still looking for a solution that can minimize the time required to load these images from web server. If i can reduce it to 1 sec on higher bandwidth, It would be great. Adding client information with every client in Red5 Saturday, May 24, 2008 09:24 GMT / Created by Page 14 of 30

In Red5 forum, I have seen so many times, developers are asking for custom client id to identify a client. Below I will try to explain how can one add additional client information with every client connected to your application. First we will create a client object-- public class Client{ String clientId = null; String clienName = null; String clientRole = null; public String getRole(){ return clientRole; } public String getName(){ return clientName; } public String getId(){ return clientId; } public void setRole(String role){ clientRole = role; } public void setName(String name){ clientName = name; } public void setId(String id){ clientId = id; } } Now we are ready with our client object, We will add this client object with the IClient in Red5 like below public boolean roomConnect(IConnection iconnection, Object params[]){ if(!super.roomConnect(iconnection, params)){ StringBuilder()).append(quot;Application failed to connect room: quot;).append(iconnection.getScope().getName()).toString()); return false; } else{ StringBuilder()).append(quot;Application room connect initiated for room quot;).append(iconnection.getScope().getName()).append(quot;: quot;).toString()); //We will add our client information right here Client client = new Client(); client.setId(params[0].toString()); client.setName(params[1].toString()); client.setRole(params[2].toString()); iconnection.getClient().setAttribute(quot;clientquot;, client); return true } } Saturday, May 24, 2008 09:24 GMT / Created by Page 15 of 30

public boolean roomJoin(IClient iclient, IScope iscope){ /*Here you can see how to access your client information throughout the application*/ Client client = ((Client)iclient.getAttribute(quot;clientquot;)); String clientName = client.getName(); String clientId = client.getId(); String clientRole = client.getRole(); return true; } This way you can have your own client id's names and roles for different clients. To create new Red5 application follow my previous post here. Red5 log forwarding to centralized log server Saturday, May 24, 2008 09:24 GMT / Created by Page 16 of 30

In order to view the log generated by Red5 in some other location( on a different log server on network), You can use the log4j feature to forward your logs to a centralized log sever, where all your applications( multiple red5 servers) are throwing their logs.This way you can later view your organize log through some log interface. Here i will explain, How you can configure your log settings in your red5 application in order to acheive that.Let say you have an application with name Test.Open the file under your application WEB-INF folder, Initially the contents will be - # logging config, this should be auto reloaded by spring. Now you can change it to - #----------------------------------------------------------------- #log4j.rootCategory=, A1 #log4j.appender.A1.RemoteHost=XX.XX.XX.XX #log4j.appender.A1.Port=8888 #log4j.appender.A1.Threshold=DEBUG #log4j.appender.A1.locationInfo=true #---------------------------------------------------------------------- The above lines describes that upon running the application, it will connect to this remote address on port 8888. Now you can also put the server name in your log messages, so that at receiving end, you can differentiate the log messages coming from different red5 servers. To acheive that, we will add some line in our application source. //------------------------------------------------------------------ public boolean appStart(IScope app){ String servername = null; try{ servername =; } catch(UnknownHostException un){ log.error(quot;Unknown host exception found while getting host name of sever quot; + un); } catch(Exception e){ log.error(quot;Exception while getting host name of sever quot; + e); } if(servername != null){ MDC.put(quot;red5serverquot;,servername); };AppStart called for : quot; + app.getName()); if (!super.appStart(app)){ log.error(quot;Unable to start the applicationquot;); Saturday, May 24, 2008 09:24 GMT / Created by Page 17 of 30

return false; } return true; } //------------------------------------------------------------- You can see from the above piece of code, that we have created a variable called quot;red5serverquot; and we are putting the server name in that.This variable will be accessed by log4j server later. Now, the sending part is complete, We have to implement the receiving end i.e. The log4j server, which will receive all these log messages. In order to run log4j server, you need to create a properties file. I am showing here, a sample file called quot;socketserver.propertiesquot;. The contents of the file will be- #-------------------------------------------------------------------- log4j.rootLogger=, A1 #log4j.appender.A1=org.apache.log4j.ConsoleAppender #log4j.appender.A1.layout=org.apache.log4j.PatternLayout # Pattern to output the caller's file name and line number. #log4j.appender.A1.layout.ConversionPattern= %X{red5server} %5p [%t] (%F:%L) - %m%n log4j.appender.A1=org.apache.log4j.RollingFileAppender log4j.appender.A1.File= remote-log.log log4j.appender.A1.MaxFileSize=1024KB log4j.appender.A1.layout=org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern= %1.25X{red5server}- %p %t %c - %m%n #------------------------------------------------------------------ Now you can see from above lines, I have referred to the same variable, i have created in source file. quot;log4j.appender.A1.layout.ConversionPattern= %X{red5server} %5p [%t] (%F:%L) - %m%nquot; This piece of code will add the red5 server name in the begining of every log message. You can now start the log4j server in order to receive the logs from applications in this way- java -cp log4j-1.2.14.jar 8888 Now your log4j server is up and running, Every application, which is referring to this log server will throw their log messages to this server, which you can later on view. Happy logging!! Saturday, May 24, 2008 09:24 GMT / Created by Page 18 of 30

To create new Red5 application, follow my post here Desktop sharing with Red5 and Flash From Last 15 days, I was trying hard to get it done. My previous research on this and some concept from open source and commercial project, I am finally able to do a complete desktop sharing in my conference application.And the best part is that, I am not using any native driver or so to acheive this, A pure java solution with flash just works fine, I got some idea from here. But i tried a little different approach for this. And the best thing is that, Only the user, who wants to share his desktop need java plugin in his browser,all other users in the conference can just see and control his desktop with their flash client, Screen rendering part is little bit slow at this time, but the mouse and keyboard controls are more faster than i expected.The only frustating part having flash as a desktop sharing client is that, there is no way to remove the flash context menu, So i have done a workaround(got it from some forum) and put right click event on context menu itself. Now i am trying to make it more faster in terms of performence. Open source video conferencing using Red5 and Open Laszlo Openmeetings, A new multilanguage, and customizable video conference and group collaboration application very similer to Adobe Connect. They have used Open Laszlo and Red5 as a technology to build this application. The project has various features like screen sharing, Document importing. There are various file format(.tga, .xcf, .wpg, .txt, .ico, .ttf, .pcd, .pcds, .ps, .psd, .tiff, .bmp, .svg, .dpx, .exr, .jpg, .jpeg, .gif, .png, .ppt, .odp, .odt, .sxw, .wpd, .doc, .rtf, .txt, .ods, .sxc, .xls, .sxi, .pdf) that you can import and share with others in the conference.The whiteboard items are draggable, You can edit the items, also some of them are resizable as well, Whiteboard can be stored or recorded. Take a live demo here Demo Screen 1- Conference Mode Screen 2- Audience Mode Screen 3- Multi color Interface For more information visit the home page of Openmeetings here Related Post New Version Of Dimdim's Open Source Community Edition Releasing Soon Secure your Red5 applications with Stunnel Saturday, May 24, 2008 09:24 GMT / Created by Page 19 of 30

Steps to configure SSL in existing Red5 application Software needed on machine where Red5 server is installed:- 1: Open SSL //Open source SSL libraries required for compiling Stunnel 2: Stunnel //Open source SSL wrapper software uses open SSL works both on Windows and Linux. 3: gcc // The GNU C compiler (although it always bundled with Linux Machine, but I did not find it. Necessary if you are compiling the Open SSL and Stunnel from source. Not required if using RPM Configuration needed on server machine:- 1:- Install the Open SSL (if windows use exe RPM or source for Linux machine can be downloaded from here- ). 2:- Install Stunnel (if windows use exe otherwise RPM or compilation from source is preferred, can be downloaded from here- Make sure that you already have compiled Open SSL in your machine before proceeding with the installation of Stunnel; otherwise it will fail to compile. Under Linux the standard command to compile Stunnel from source are described below. For any update please always follow the installation instructions given their website. machine# gzip -dc stunnel-VERSION.tar.gz tar -xvzf - machine# cd stunnel-VERSION machine# ./configure machine# make machine# make install There are several configurations that differ based on your computer and environment. That can be read from the website itself. 3:- Running Stunnel (There are several ways/mode you can run the stunnel. Follow the FAQ available in their website to choose the best which matches your requirements). To run stunnel, you always require a configuration file. The process of making sample configuration file (stunnel.conf) is described below. The sample configuration file used was like this. ************************************************************************ sample.conf ; Sample stunnel configuration file by Sunil Gupta 2007 ; Some options used here may not be adequate for your particular configuration ; Certificate/key is needed in server mode and optional in client mode Saturday, May 24, 2008 09:24 GMT / Created by Page 20 of 30

; The default certificate is provided only for testing and should not ; be used in a production environment cert = /etc/stunnel/stunnel.pem ;chroot = /var/run/stunnel/ pid = / key = /etc/stunnel/stunnel.pem ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Workaround for Eudora bug ;options = DONT_INSERT_EMPTY_FRAGMENTS ; Authentication stuff ;verify = 2 ; Don't forget to c_rehash CApath ;CApath = certs ; It's often easier to use CAfile ;CAfile = certs.pem ; Don't forget to c_rehash CRLpath ;CRLpath = crls ; Alternatively you can use CRLfile ;CRLfile = crls.pem ; Some debugging stuff useful for troubleshooting debug = 7 Output = /var/log/stunnel.log foreground=yes ; Use it for client mode ; client = yes ; Service-level configuration ;[pop3s] ;accept = 995 ;connect = 110 ;[imaps] ;accept = 993 ;connect = 143 ;[ssmtp] ;accept = 465 ;connect = 25 [rtmps - https] TIMEOUTconnect=20 accept = 443 connect = 80 TIMEOUTclose = 20 ; vim:ft=dosin Saturday, May 24, 2008 09:24 GMT / Created by Page 21 of 30

*****************************Finish************************************* Note: - When you install Stunnel, you get a default sample file, which is not enough in most of the cases to run the flash application. The additions to configuration file I made are as follows. Also the line having ; in the start denotes the commented portion in file. cert = /etc/stunnel/stunnel.pem key = /etc/stunnel/stunnel.pem pem stands for ?privacy enhanced mail' used as a key format. The above two lines tells the location of pem files need to be generated. This will be configured by user. The above is the best location for Stunnel although you can change it to any desired location. ;Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 The above two lines are for better performance of Stunnel in our case. ; Workaround for Eudora bug ;options = DONT_INSERT_EMPTY_FRAGMENTS The above line is a bug in a specific platform, since we are running it in Linux; we commented this line, although it could be needed in some case. ; Some debugging stuff useful for troubleshooting debug = 7 Output = /var/log/stunnel.log foreground=yes The above lines are very important, Because Stunnel by default run in background mode. You will never be able to see if it is running. So better to put it in foreground, so that you can make sure that stunnel is running properly. Also the debug = 7 is very important since by default stunnel does not generate any log. You can direct him to generate log, so that you can debug your application by seeing all those log messages. The above mentioned log directory is default Linux directory where all system logs are generated. ; Use it for client mode ; client = yes In the sample configuration file, you will always find this option un-commented leading to a different architecture, since we are running Stunnel in server mode not client mode, so we will comment this line. [rtmps - https] TIMEOUTconnect=20 accept = 443 connect = 80 TIMEOUTclose = 20 And the very last lines are mentioned above. In the sample configuration file, you will never find rtmps and it is not even mentioned anywhere in Stunnel. The default file contains only https, add rtmps like it is added here. Also accept port is 443, which is the default port used for secure communication and it is open like port Saturday, May 24, 2008 09:24 GMT / Created by Page 22 of 30

80 in all corporate firewalls in general. This port is to accept the connection from flash and to get the encrypted data. The connect port is 80; this is the port where stunnel will forward the decrypted data to red5 server. The TIMEOUTconnect and TIMEOUTclose can be useful in some cases when the server where the data is being forwarded by Stunnel is delaying the connection. This is to make sure that connection is closed only when server is not responding at all. The value is in seconds (i.e. 20 sec.) Now in order to run your application under secure connection, you require a certificate to be created on the machine where the Stunnel is installed. The procedure for creating a certificate and the possible directory to put this certificate is described below. Use of certificate:- When an SSL client connects to an SSL server, the server presents a certificate, essentially an electronic piece of proof that machine is who it claims to be. This certificate is signed by a 'Certificate Authority' (hereafter a CA) -- usually a trusted third party like Verisign. A client will accept this certificate only if The certificate presented matches the private key being used by the remote end. The certificate has been signed correctly by the CA. The client recognizes the CA as trusted. Every stunnel server has a private key. This is contained in the pem file which stunnel uses to initialize its identity. If we notice above, we have given the reference of this pem file in the start of our configuration file under cert. This private key is put in /usr/local/ssl/certs/stunnel.pem. Note:-Under client mode we need not to have certificate in most of the cases, but if we are running it in server mode, we require a certificate. Since we are using server mode, I have generated a self certificate. To make certificate:- 1: Go to /etc/stunnel directory and 2: Run the following command:-? openssl req -new -x509 -days 365 -nodes -config stunnel.cnf -out stunnel.pem -keyout stunnel.pem This creates a private key and self-signed certificate. More information on the options of this can be read from FAQ section of Stunnel website. While executing the command, it will ask for some questions like Country, City, Company etc., Give the answer of those and it will generate the key and self certificate. 4:- Put your sample.conf file in /etc/stunnel directory where the .pem file was created earlier. 5:- Start Stunnel by issuing the command ? machine# stunnel stunnel.conf If you are /etc/stunnel directory otherwise complete path of configuration file- machine# stunnel /etc/stunnel/stunnel.conf The above command will start the stunnel and you can verify the log from /var/logs/stunnel.log file. Saturday, May 24, 2008 09:24 GMT / Created by Page 23 of 30

Red5 server side changes:- 6:- Now stunnel is up and running, we need to change the Red5 configuration to accept the connection from Stunnel. Go to red5 installation directory and search for conf folder where all red5 configuration files exist. Open file and under rtmps.host_port property put 443. The sample file can be like below. rtmp.host_port = rtmp.threadcount = 4 debug_proxy.host_port = proxy_forward.host_port = rtmps.host_port = http.port=5080 rtmpt.port=80 Flash client side changes:- 7:-Now we are done with server side, In order to run application under SSL, we need to change the client side protocol from rtmp to rtmps like below. And compile the flash client and run it on browser, a certificate will pop up, accept it and the application will run under SSL. nc.connect (?rtmps://yourip/applicationname?); //used rtmps in place of rtmp To create new Red5 application, follow my post here Test Tetsing our application No flash Please install FLASH plugin. Shared Whiteboard application in Red5 Saturday, May 24, 2008 09:24 GMT / Created by Page 24 of 30

Working with Red5 server is a fun, In the last tutorial, I have created a sample application in Red5. Now this time, I will try to explore the conecpt of shared objects in Red5 using an example of shared whiteboard. Creating a simple shared whiteboard application in red5 is very easy, All you need is to get the corrdinates and put them in the shared object and let shared object work for you. On Client Side:- We have a shared object say var whiteboard_SO:SharedObject = SharedObject?getRemote(quot;whiteboardquot;,nc.uri,quot;falsequot;); Now when we move mouse pointer over a movie clip for drawing , we capture the xmouse and ymouse to send them to server. For Example. sample_MC.onPress = function(){ //Send xmouse and ymouse to server along with quot;pressquot; event string;somemethodquot;, null,param1, param2,param3); //sending values }; sample_MC.onMouseMove = function(){ //Send xmouse ymouse along with quot;movequot; event string;somemethodquot;, null,param1, param2,param3); //sending values } Now on server(java) side change the shared object with these values E.g. public void somemethod(Object[] params){ whiteboard_SO.setAttribute(quot;pointquot;,params[0].toString()+quot;:quot;+params[1].toString()+quot;:quot;+params[2].toString()); // The above code will fire the onSync event on all connected clients. } Now on Client side :- Whiteboard_SO.onSync = function(infolist){ // Inside the change event we will get the xmouse and ymouse and press string //If event string is press, jump to new line(i.e. lineto(x,y)) //If event string is move, move with drawing(i.e. moveto(x,y)) } This way , A shared whiteboard can easily be created. To create a new Red5 application , follow my post here Reference:- Create whiteboard application with Flash communication server How to create a sample application using Red5 and Flash Saturday, May 24, 2008 09:24 GMT / Created by Page 25 of 30

How to create a sample application using Red5 and Flash Step 1:- Get a default application template from doc folder of your Red5 installation directory (e.g. for windows: - ?C:Program filesRed5doctemplatesmyapp?). Copy this folder into Red5webapps directory. Step2:- Now we have a default template available for running the server side application. We will change the default configuration accordingly. Rename myapp folder to sample. This sample folder will be the name of your application. We will now change the configuration files inside sample folder. The structure of the application will be like this- Open the file and change the contextPath to sample like below ? webapp.contextPath=/sample webapp.virtualHosts=localhost, Open web.xml file and change the display and webAppRootKey like below? My First sample application with Red5 webAppRootKey /sample Now open the red5-web.xml file and change the application name likes below- where is the package structure used here. It could be replaced with actual application structure. lib directory will contain the jar file of our application. We will explore it later while creating an application. Step3:- We are ready with the server side application configuration. Now we will create the actual application which will interact with the flash client. Open any java IDE like eclipse and create a new java project. Name it to Sample. Create following structure in the Sample project. src folder will contain the application package structure Compiled class file will be under classes folder and lib folder will contain the jar of compiled class. Saturday, May 24, 2008 09:24 GMT / Created by Page 26 of 30

Now create a build.xml file for building this project with ant tool. The sample build file will be like this- Here in ?jar? target we have copied the created jar file inside our application directory under webapps folder of Red5 installation. One can manually do the copy paste. Note: - Don?t forget to add red5.jar from your Red5 installation in the CLASSPATH of eclipse so that it can find the Red5 libraries and compile the application without any errors.. Step4:- Now we will create our source file. Create a java file, name it to The sample application file will be like ? package; //log4j classes import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; //Red5 classes import org.red5.server.adapter.ApplicationAdapter; import org.red5.server.api.IClient; import org.red5.server.api.IConnection; import org.red5.server.api.IScope; /**This is the sample application class */ public class Application extends ApplicationAdapter{ /**Variable used for generating the log*/ Saturday, May 24, 2008 09:24 GMT / Created by Page 27 of 30

private static final Log log = LogFactory.getLog(Application.class); /**This method will execute when Red5 server will start*/ public boolean appStart(IScope app){ if(super.appStart(app) == false){ return false; };Application start method of Application calledquot;); return true; } /**This method will execute when first client will connect to Red5 server*/ public boolean roomStart(IScope room){ if(super.roomStart(room) == false){ return false; };Inside room start of Applicationquot;); return true; } /**This method will execute everytime when a client will connect to Red5 server*/ public boolean roomConnect(IConnection conn, Object params[]){ if(super.roomConnect(conn, params) == false){ return false; };Inside room connect method of Applicationquot;); return true; } /**This method will be called when a client disconnect from the room*/ public void roomDisconnect(IConnection conn){ super.roomDisconnect(conn);;Inside room disconnect method of Applicationquot;); } /**This method will be called when a client will be disconnected from application*/ public void appDisconnect(IConnection conn){;Inside app disconnect method of Applicationquot;); } /**This method will be called from the client. This method will show ?Hello World!? on *the flash client side . */ public String sayHello(Object[] params){ got your name:-?+params[0].toString()); return ?Hello World!? + params[0].toString(); } } ////////End of Application class The above file was just to give a feel of how a server side code looks like. Read Red5 documentation for more details on methods in AplicationAdapter class. Here we have defined a method named sayHello, which will get user name from flash client and will append this user name to ?Hello Saturday, May 24, 2008 09:24 GMT / Created by Page 28 of 30

World!? and will send back to flash client. Now run the jar task of your build.xml file, this will compile your application class, will generate the desired jar and will copy it to your application directory inside Red5. Step5:- Now we are ready with server side application, we will start with the flash application to connect with the Red5 server. Create a new flash document ? Drag an Alert component from window?components in the library. Open the Action-Frame and write the following lines of code- import mx.controls.Alert; var nc:NetConnection = new NetConnection(); nc.val = this; nc.onStatus = function(info){ switch(info.code){ case quot;NetConnection.Connect.Successquot;:;Got connected with application); this.val.callServer(); break; case quot;NetConnection.Connect.Failedquot;:; break; case quot;NetConnection.Connect.Rejectedquot;:; break; case quot;NetConnection.Connect.Closedquot;:;Client Disconnectedquot;); Saturday, May 24, 2008 09:24 GMT / Created by Page 29 of 30

break; } }; nc.connect(quot;rtmp://localhost/samplequot;); function callServer(){ var resultObj:Object = new Object();;sayHelloquot;, resultObj,quot;Your Namequot;); resultObj.onResult = function(str){; //This will display quot;Hello World! Your Namequot; } }; } Now save the application and name it to sample.fla(user preferred) The above code is Action script 1 code; you can put this code in external .As file and refer it in the application. Since this is not in the scope of this tutorial, so we will follow the above code. Finish:- Run your flash client and if its get successfully connect with Red5 server, it will display an alert box saying ?Hello World! Your Name? With the help of above tutorial, you can extend your application to any level. For more information on Red5 related documents follow the link provided below- Red5- Open source flash server Red5-How to create new applications ? Joachim Baunch Migration Guide from FCS/FMS to Red5 Red5-How to create new application Saturday, May 24, 2008 09:24 GMT / Created by Page 30 of 30

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