Combining audio and video tracks into new MediaStream : <p>I need to get create a MediaStream using audio and video from different MediaStreams.  In Firefox, I can instantiate a new MediaStream from an Array of tracks:</p>

<pre><code>  var outputTracks = [];
  outputTracks = outputTracks.concat(outputAudioStream.getTracks());
  outputTracks = outputTracks.concat(outputVideoStream.getTracks());
  outputMediaStream = new MediaStream(outputTracks);
</code></pre>

<p>Unfortunately, this doesn't work in Chrome:</p>

<blockquote>
  <p>ReferenceError: MediaStream is not defined</p>
</blockquote>

<p>Is there an alternative method in Chrome for combining tracks from separate streams?</p>
