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  • HTML5 Video/Audio to Nodejs via Socket.io but with a twist - FFMPEG

    9 janvier 2014, par user1840958

    I'm writing this very simple "skype clone". I tried a variety of other languages, python and layering over Node.js with Meteor, WebRTC, but Node.js+socket.io seems to be working the best and cleanest however I've hit a road block and I can't get it all to work correctly.

    I have two issues,
    1. I think I'm sending real data from the HTML5 getUserMedia, but I might not, and I don't know how to test or find out. I think that using, "video.src = window.URL.createObjectURL(stream) ;" makes the Blob stream an actual Data stream... but I don't know.

    This is my Broadcast.html
    It's a very simple getUserMedia grab the camera and microphone... Then I connect to the Socket and on click of the Broadcast button, fires off the Emit to 'Join' and sends over the 'webcamstream' data.

    <video autoplay="autoplay" height="280"></video>
    
<button class="recordbutton">Broadcast</button>
    

    

    
<code class="echappe-js">&lt;script language=&quot;javascript&quot; type=&quot;text/javascript&quot;&gt;<br />
    
var socket = io.connect(&amp;#39;http://video.domain.com:3031&amp;#39;);<br />
    
socket.on(&amp;#39;connect&amp;#39;, function() {<br />
    
  $(&amp;#39;#conversation&amp;#39;).append(&amp;#39;Connected &lt;br /&gt;&amp;#39;);<br />
    
});<br />
    
<br />
    
function onVideoFail(e) {<br />
    
  console.log(&amp;#39;webcam fail!&amp;#39;, e);<br />
    
};<br />
    
<br />
    
function hasGetUserMedia() {<br />
    
  return !!(navigator.getUserMedia || <br />
    
    navigator.webkitGetUserMedia || <br />
    
    navigator.mozGetUserMedia || <br />
    
    navigator.msGetUserMedia);<br />
    
}<br />
    
<br />
    
if (hasGetUserMedia()) {<br />
    
  alert(&amp;#39;It is working...&amp;#39;);<br />
    
} else {<br />
    
  alert(&amp;#39;getUserMedia() is not supported in your browser&amp;#39;);<br />
    
}<br />
    
<br />
    
window.URL = window.URL || window.webkitURL;<br />
    
navigator.getUserMedia  = navigator.getUserMedia || <br />
    
                         navigator.webkitGetUserMedia ||<br />
    
                          navigator.mozGetUserMedia || <br />
    
                           navigator.msGetUserMedia;<br />
    
<br />
    
var video = document.querySelector(&amp;#39;video&amp;#39;);<br />
    
var streamRecorder;<br />
    
var webcamstream;<br />
    
<br />
    
if (navigator.getUserMedia) {<br />
    
        navigator.getUserMedia({audio: true, video: true}, function(stream) {<br />
    
            video.src = window.URL.createObjectURL(stream);<br />
    
            webcamstream = stream;<br />
    
        }, onVideoFail);<br />
    
} else {<br />
    
   alert (&amp;#39;failed&amp;#39;);<br />
    
}<br />
    
<br />
    
function startBroadcasting() {<br />
    
    alert(&amp;#39;Broadcast Now Clicked&amp;#39;);<br />
    
    console.log(webcamstream);<br />
    
    socket.emit(&amp;#39;join&amp;#39;, webcamstream);<br />
    
    socket.emit(&amp;#39;echo&amp;#39;, &amp;#39;echo1 echo2 echo3 &lt;br /&gt;&amp;#39;);<br />
    
}<br />
    
<br />
    
socket.on(&amp;#39;echo&amp;#39;, function(data) {<br />
    
    $(&amp;#39;#conversation&amp;#39;).append(data);<br />
    
}); <br />
    
&lt;/code&gt;&lt;/pre&gt;<br />
    
<br />
    
&lt;p&gt;&lt;/p&gt;<br />
    
<br />
    
&lt;p&gt;This is the app.js<br />
    
2. What I&amp;#39;m trying to do here is consume in the &amp;#39;stream&amp;#39; from the socket, but in it&amp;#39;s place I have a test video to see if the FFMPEG is actually working. I&amp;#39;m using &lt;a href=&quot;https://github.com/schaermu/node-fluent-ffmpeg&quot; rel=&quot;nofollow&quot;&gt;https://github.com/schaermu/node-fluent-ffmpeg&lt;/a&gt;.&lt;/p&gt;<br />
    
<br />
    
&lt;p&gt;When I run this test with my myth.mp4 file, I do get an out.avi however it&amp;#39;s 0 bytes ??&lt;/p&gt;<br />
    
<br />
    
&lt;pre&gt;&lt;code&gt;var express = require(&amp;#39;express&amp;#39;);<br />
    
var socket = require(&amp;#39;socket.io&amp;#39;);<br />
    
var ffmpeg = require(&amp;#39;fluent-ffmpeg&amp;#39;);<br />
    
var fs = require(&amp;#39;fs&amp;#39;);<br />
    
<br />
    
var app = express();<br />
    
<br />
    
app.configure(function(req, res){<br />
    
    app.use(express.static(__dirname + &amp;#39;/&amp;#39;));<br />
    
});<br />
    
<br />
    
var server = app.listen(3031);<br />
    
var io = socket.listen(server);<br />
    
<br />
    
io.sockets.on(&amp;#39;connection&amp;#39;, function(socket) {<br />
    
    socket.on(&amp;#39;join&amp;#39;, function(stream) {<br />
    
        socket.stream = stream;<br />
    
        socket.emit(&amp;#39;echo&amp;#39;, socket.stream + &amp;#39;&lt;br /&gt;&amp;#39;);<br />
    
        var proc = new ffmpeg({source:&amp;#39;/srv/www/domain.com/video/red/myth.mp4&amp;#39;})<br />
    
            .withAspect(&amp;#39;4:3&amp;#39;)<br />
    
            .withSize(&amp;#39;640x480&amp;#39;)<br />
    
            .applyAutopadding(true, &amp;#39;white&amp;#39;)<br />
    
            .saveToFile(&amp;#39;/srv/www/domain.com/video/red/out.avi&amp;#39;, function(retcode, error){<br />
    
                socket.emit(&amp;#39;echo&amp;#39;, &amp;#39;file has been converted succesfully &lt;br /&gt;&amp;#39;);<br />
    
            });<br />
    
    });<br />
    
    socket.on(&amp;#39;echo&amp;#39;, function(data) {<br />
    
        socket.emit(&amp;#39;echo&amp;#39;, data);<br />
    
    });<br />
    
});<br />
    
&lt;/code&gt;&lt;/pre&gt;<br />
    
<br />
    
&lt;p&gt;I get no errors on Node Start up, I get no Errors on running.  I do get a 0 Byte out.avi file freshly created every time I run this.&lt;/p&gt;<br />
    
<br />
    
&lt;p&gt;I have a linode VPS with CentOS/Nginx&lt;/p&gt;<br />
    
<br />
    
&lt;p&gt;node -v<br />
    
v0.10.21&lt;/p&gt;<br />
    
<br />
    
&lt;p&gt;FFMPEG<br />
    
ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers<br />
    
  built on Nov 23 2013 17:43:13 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)<br />
    
  configuration: --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libvo-aacenc --enable-libxvid --disable-ffplay --enable-shared --enable-gpl --enable-postproc --enable-nonfree --enable-avfilter --enable-pthreads --extra-cflags=-fPIC<br />
    
  libavutil      52. 18.100 / 52. 18.100<br />
    
  libavcodec     54. 92.100 / 54. 92.100<br />
    
  libavformat    54. 63.104 / 54. 63.104<br />
    
  libavdevice    54.  3.103 / 54.  3.103<br />
    
  libavfilter     3. 42.103 /  3. 42.103<br />
    
  libswscale      2.  2.100 /  2.  2.100<br />
    
  libswresample   0. 17.102 /  0. 17.102<br />
    
  libpostproc    52.  2.100 / 52.  2.100<br />
    
Hyper fast Audio and Video encoder<br />
    
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...&lt;/p&gt;<br />
    
<br />
    
&lt;p&gt;Thanks in advance for your help.&lt;/p&gt;

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