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PONodeJS and RED 5 media server via RTMP
 

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    <p>This is more a conceptual question rather than a direct "how to do this". </p> <p><em>Is it generally possible to implement a flash-like solution to stream the audio (independent of where we get the stream data from, e.g. webRTC or other) in HTML5 and nodeJS/binaryJS. If so, how would you go about this?</em></p> <p>There has been only one inquire on stackoverflow <a href="https://stackoverflow.com/questions/11891818/rtmp-implementation-in-nodejs-is-possible">found here</a> and its from 2010. NodeJS and HTML5 have grown and matured since then.</p> <p><strong>What people usually do:</strong> When using multimedia streaming (i.e. video or audio) to a server, there is definitely nothing that beats Flash at the current point in time till the full arrival of <a href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html" rel="nofollow noreferrer">getUserMedia()</a> - which quite honestly might <a href="http://caniuse.com/#search=getusermedia" rel="nofollow noreferrer">take a while</a> till 99% of the browser users will get to use it at all.</p> <p>General practice to stream data to the server is by using a client Flash or Flex application which is then connecting to a RTMP protocol powered media server like <a href="http://www.red5.org/" rel="nofollow noreferrer">RED5</a>, <a href="http://www.adobe.com/products/adobe-media-server-family.html" rel="nofollow noreferrer">FMS</a> or <a href="http://www.wowza.com" rel="nofollow noreferrer">Wowza</a>. For example, the client app sending the microphone input over RTMP could look like (simplified version)</p> <pre><code>import flash.net.NetStream; private var myMic:Microphone; private var nc:NetConnection; private var ns:NetStream nc = new NetConnection(); ns = new NetStream(nc); nc.connect(rtmp://localhost/serverApp); myMic = Microphone.getMicrophone(); ns.attachAudio(myMic); </code></pre> <p>Together with a server application one is easibly able to stream data to the server.</p> <p><strong>What I would like to do:</strong> Have an app server running on <a href="http://nodejs.org/" rel="nofollow noreferrer">nodeJS</a> (possibly implementing <a href="http://socket.io/" rel="nofollow noreferrer">socketIO</a> and <a href="http://binaryjs.com/" rel="nofollow noreferrer">binaryJS</a>) that catches the incoming RTMP stream. Something like</p> <pre><code>//require var rtmp = require('node-rtmp'), var fs = require('fs'); //rtmp server address var rtmpServer = 'rtmp://localhost'; //create a binary server listening that receives stream data var RTMPServer = rtmp.RTMPServer(); var server = RTMPServer ({port: 1935}); server.on('connection', function(client){ //check if user is allowed to do so rtmp.newStream(client.stream); }); </code></pre> <p>Possibly it might be better to use socketIO to differentiate between user interactions via eventEmitters.</p> <p><strong>What might be the advantages:</strong> Generally speaking it seems like a bit overhead to make this kind of approach, but for me there might be advantages and I'd also like you to comment on this.</p> <ul> <li>easy validation of user interaction by running e.g. <a href="http://expressjs.com/" rel="nofollow noreferrer">express</a> and socketIO</li> <li>hybrid implementation of a flash (via RTMP) and getUserMedia() (via binary transport mechanisms by adding binaryJS and the Mozilla AudioAPI)</li> <li>if getUserMedia() gets fully supported, flash implementations can be dropped easily</li> <li>more control over the rtmp followup and user interaction in general</li> <li>easier implementation into server frameworks</li> </ul> <p><strong>UPDATE:</strong> I've talked to Mr. Malcontenti-Wilson who is responsible for the <a href="https://github.com/adammw/node-rtmp" rel="nofollow noreferrer">only node-rtmp package</a> that was written but discontinued 8 months ago as it was poorly written and he hit a roadblock. Anyone who used this or was able to check the code?</p> <p><strong>UPDATE 2:</strong> Mr. Malcontenti-Wilson just send me a mail to get my attention to <a href="https://github.com/nalply/mtrude" rel="nofollow noreferrer">node-mtrude</a> (kind of an odd name) which is doing kind of what we would probably want. Has anyone work with this kind of package?</p>
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    1. COExcellent question. Yes, it is possible. There are a couple RTMP Node.js projects out there. I haven't used any personally, so I cannot provide a good recommendation.
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    2. COI would recommend you to write a C extension binding for the rtmpDump (http://rtmpdump.mplayerhq.hu) library, as described here https://www.cloudkick.com/blog/2010/aug/23/writing-nodejs-native-extensions/
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    3. COI don't really know anything about node.js, but [bigbluebutton](https://code.google.com/p/bigbluebutton/) implements something like this in flash, and they are working on an html 5 solution. It might be worth checking out the code.
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