Opentok Screen Sharing with Audio

问题:

I try to create a Screen Sharing application with the opentok JS client that shares the publishers audio as well.

Screen Sharing works fine. But the audio is never shared.

Now, I noticed a warning in the console (Firefox) saying Invalid audioSource passed to Publisher - when using screen sharing no audioSource may be used. Does that mean it is not possible at all, or that the audio source is invalid?

回答1:

With v2.13.0 it is now possible to pass a MediaStreamTrack as a custom audioSource and videoSource to initPublisher. This means you are able to add your microphone audio to the screen sharing stream. This will only work in Chrome or Firefox. IE does not support MediaStreamTrack's and Safari does not currently support screensharing.

const publish = Promise.all([
  OT.getUserMedia({
    videoSource: 'screen'
  }),
  OT.getUserMedia({
    videoSource: null
  })
])
.then(([screenStream, micStream]) => {
  return OT.initPublisher(null, {
    videoSource: screenStream.getVideoTracks()[0],
    audioSource: micStream.getAudioTracks()[0]
  });
});

Here is a sample of it all working https://output.jsbin.com/wozuhuc This sample will only work in Firefox because Chrome needs an extension.

回答2:

If you create a subscriber, and connect it to the session, it will receive audio and video from all publishers. As far as I know, there is no audio in screen sharing, that's why you cannot publish it. That should solve it. I hope this helps.

回答3:

I contacted the tokbox support and they confirmed, that the audio has to be published in an additional stream.