Combining audio and video tracks into new MediaStream

Question

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:

Answer 1

still vendor-prefixed with webkit:

  var outputTracks = [];
  outputTracks = outputTracks.concat(outputAudioStream.getTracks());
  outputTracks = outputTracks.concat(outputVideoStream.getTracks());
  outputMediaStream = new webkitMediaStream(outputTracks);