Working with Red5 is like pulling teeth.<\/p>\n
Trying to see if I can spawn an ffmpeg instance after uploading a live video capture.<\/p>\n
First step was to see if I could edit\/copy any existing application, us to get the recipe. the oflaDemo application is he usual kick off for such things, but it is in fact a very simplistic demo and not exactly what I had in mind. All it really does is list the media files in the streams folder, and report back to the Flash client.<\/p>\n
A better example appeared to be Carl Sziebert’s server side stream-recording:<\/p>\n
http:\/\/sziebert.net\/posts\/server-side-stream-recording-updated\/<\/p>\n
He gives us the Java code (and ActionScript, too). It seems to interact with Red5 a lower level than the base ActionScript NetConnection tools. This, I hope, will allow me to follow But first, how to compile and install a new app?<\/p>\n I got the red5 sample code using I duplicated the oflaDemo folder inside folder trunk, and renamed it Recorder<\/p>\n I replaced the Application.java and StreamManager.java files in \/src\/org\/red5\/demos\/oflaDemo with the sziebert code. renamed enclsing folder \/src\/org\/red5\/demos\/Recorder<\/p>\n set working directory to trunk\/Recorder, setenv RED5_HOME to correct path, and invoked ant to compile. Looked in dist folder for Recorder.war, renamed it as Recorder.zip, unzipped, and moved result to Red5\/webapps<\/p>\n in webapps.Recorder.WEB-INF, edited red5-web.properties, red5-web.xml, and web.xml to replace references to org\/red5\/demos\/oflaDemo with net\/sziebert\/tutorials<\/p>\n restarted red5, tried my old Flash client (modified to connect to server address xxx.yyy.zzz.qqq\/Recoder ), worked as it did before.<\/p>\n After looking again at my ActionScript Flash client, I see that I already have:<\/p>\n \n So, turns out I know exactly when my stream has finished uploading, and it is safe to launch ffmpeg. I really didn’t need sziebert’s low-level stuff. I just needed to rewrite Application.java to include a method which I could name ‘launchexternal’ which execs a shell command. Then, my ActionScript code becomes<\/p>\n \n function Result(result:Object) { function doCloseRecord() { Fault and Result are functions that return results from the Responder object, The responder object gets passed to the nc.call method, and the results of launchexternal are returned<\/p>\n At first blush, then, my new Application java starts to look like this<\/p>\n \n By gosh, it worked, and the results of the ls command were spewed across the console from which I launched red5<\/p>\n But was it an asynchronous background process? Further research into Runtime.getRuntime().exec suggested it was depreciated in favor of ProcessBuilder.<\/p>\n","protected":false},"excerpt":{"rendered":" Working with Red5 is like pulling teeth. Trying to see if I can spawn an ffmpeg instance after uploading a live video capture. First step was to see if I could edit\/copy any existing application, us to get the recipe. … Continue reading stream.saveAs(streamName, false); <\/code>with something like child = Runtime.getRuntime().exec(command);<\/code>.<\/p>\n
\nsvn checkout http:\/\/red5.googlecode.com\/svn\/java\/example\/trunk\/<\/code>.<\/p>\nfunction doCloseRecord() {
\n\t\/\/ after we have hit \"Stop\" recording and after the buffered video data has been
\n\t\/\/ sent to the Flash Media Server close the publishing stream
\n\tnsPublish.close();
\n\tnsPublish.publish(\"null\");
\n\tWait.text=\"Done!\";
\n}<\/code>\n<\/p><\/blockquote>\n
\nfunction Fault(f:Event ){
\n trace(\"There was a problem: \" + f.toString());
\n}<\/p>\n
\n\ttrace(\"result from launchexternal \"+ result);
\n};
\nvar res = new Responder(Result,Fault);<\/p>\n
\n\t\/\/ after we have hit \"Stop\" recording and after the buffered video data has been
\n\t\/\/ sent to the Flash Media Server close the publishing stream
\n\tnsPublish.close();
\n\tnsPublish.publish(\"null\");
\n\tWait.text=\"Done!\";
\n\tnc.call(\"launchexternal\",res);
\n}<\/code>\n<\/p><\/blockquote>\n
\npublic string launchexternal() {
\n \t\tlog.info(\"wrecorder launchexternal\");
\n\t\tSystem.out.println(\"wrecorder launchexternal\");
\n\t\ttry {
\n\t\t\tString[] commands = new String[]{\"ls\", \"-lt\", \"..\"};
\n\t\t\tProcess child = Runtime.getRuntime().exec(commands);
\n\t\t\tInputStream in = child.getInputStream();
\n\t\t\tint c;
\n\t\t\twhile ((c = in.read()) != -1) {
\n\t\t\t\tSystem.out.println((char)c);
\n\t\t\t}
\n\t\t\tin.close();
\n\t\t} catch (IOException e) {
\n }
\n\t\treturn true;
\n\t}<\/code>\n<\/p><\/blockquote>\n