title: Error: spawn ffmpeg ENOENT
body: <p>I tried got video stream on the rtsp with use MEAN stack, but when I added this code in my server.js file, I caught the error: "spawn ffmpeg ENOENT".
  Maybe I forgot to install some lib or what? please help me!
  Code: </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>app.get('/', function (req, res) {
   Stream = require('node-rtsp-stream');
   stream = new Stream({
       name: 'name',
       streamUrl: 'rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov',
       wsPort: 9999
   });
   res.send(stream);
   console.log('9999')
  });</code></pre>
  </div>
  </div>
  </p>