I am not sure how or if FMS provides a means for dynamic rooms, but Red5 does and I will try to explain how to use it below. For the following example, you should expect the following url – rtmp://localhost/myapp/room is being used. The method below is an overridden super class method from the Red5 application adapter. The example places a client into an id based “chat” room; the id algorithm could be anything you desire and is not fixed. I have used this block in a couple projects, one of which used an encrypted room and id portion and its url looked similar to this – rtmp://localhost/myapp/29c8109abd29e

	@Override
	public boolean roomJoin(IClient client, IScope scope) {
		log.debug("roomJoin - client id: {} scope: {}", client.getId(), scope);

		IConnection conn = Red5.getConnectionLocal();

		String scopeName = scope.getName();
		log.debug("Scope name: {}", scopeName);

		//check for "application" scope
		if ("myapp".equals(scopeName)) {
			log.debug("Connection already connected to app scope");
		} else if (conn.hasAttribute("in.room")) {
			//client is already in a room
			log.debug("Connection already connected to room scope");
		} else {
			//the room name
			String roomName = scopeName;
			//set flag
			conn.setAttribute("in.room", true);
			//get app scope
			IScope appScope = scope.getParent();
			//handle at room level
			if ("room".equals(roomName)) {
				//lookup room (top level)
				IScope roomScope = ScopeUtils.resolveScope(appScope, roomName);
				if (roomScope == null) {
					if (appScope.createChildScope(roomName)) {
						log.debug("Room {} created", roomName);
						roomScope = appScope.getScope(roomName);
					} else {
						log.warn("Room {} was not created", roomName);
					}
				} else {
					log.debug("Room scope {} was found", roomName);
				}
				//get the next room identifier
				String chatId = getNextChatId();
				//room for chat id
				IScope chatScope = ScopeUtils.resolveScope(roomScope, chatId);
				if (chatScope == null) {
					if (roomScope.createChildScope(chatId)) {
						log.debug("Chat scope {} created", chatId);
						chatScope = roomScope.getScope(chatId);
					} else {
						log.warn("Chat scope {} was not created", chatId);
					}
				} else {
					log.debug("Chat scope {} was found", chatId);
				}				

				//send the actual join
				return roomJoin(client, chatScope);
			} else {
				return false;
			}
		}

		return super.roomJoin(client, scope);
	}

After this block is executed, your client would be connected to something like this – rtmp://localhost/myapp/room/1001 without having to create any additional NetConnections. The method “getNextChatId()” is meant to provide a chat room id, based on whatever criteria you would like.

By default or so I’ve been told, the Flash Player will try various ports when attempting to connect to a resource. In Red5, RTMP is supported out-of-the-box on the default RTMP port of 1935 and HTTP is setup on 5080. A “special” server is started on 8088 as well to handle RTMPT only requests, but this requires that you set your request url as “rtmpt://myserver:8088/myapp/” which can be confusing and completely ignores the Flash Player port probing. So I offer this solution, allowing you to setup HTTP on port 80 and RTMPT on port 80 as well. Since Red5 includes a servlet container (Tomcat by default), you have a full-fledged HTTP server and servlet engine built-in; allowing a servlet to answer the RTMPT requests.
The first file we need to modify is the server properties file located in the conf directory:
red5/conf/red5.properties

• Locate the http.port key and change it to 80 instead of 5080
• Do not change the rtmpt.port entry, it should be 8088
• Save and close the file

The last file to modify will be your web application configuration or “web.xml” file. The web application configuration file will be located here: red5/webapps/myapp/WEB-INF/web.xml if your application name is “myapp”. Add these entries:

   	<servlet>
		<servlet-name>rtmpt</servlet-name>
		<servlet-class>org.red5.server.net.rtmpt.RTMPTServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

	<servlet-mapping>
		<servlet-name>rtmpt</servlet-name>
		<url-pattern>/fcs/*</url-pattern>
	</servlet-mapping>

	<servlet-mapping>
		<servlet-name>rtmpt</servlet-name>
		<url-pattern>/open/*</url-pattern>
	</servlet-mapping>

	<servlet-mapping>
		<servlet-name>rtmpt</servlet-name>
		<url-pattern>/close/*</url-pattern>
	</servlet-mapping>

	<servlet-mapping>
		<servlet-name>rtmpt</servlet-name>
		<url-pattern>/send/*</url-pattern>
	</servlet-mapping>

	<servlet-mapping>
		<servlet-name>rtmpt</servlet-name>
		<url-pattern>/idle/*</url-pattern>
	</servlet-mapping>

Informational links about FlashPlayer and ports:
HTTP Tunneling protocols

The Trouble with Proxy Servers

I want to let everyone know about a simple RTMP load testing tool that I wrote in flex. Its really simple and allows you to rip a stream from either FMS or Red5 as quickly as possible. If you find it useful or want to add to it, let me know.

• source here
• bin-release here

The source link is for the latest version in which I have started adding shared object testing; I could use some assistance with that part if any of you have time. The bin link is to the “old” version.