Changing the VideoTrack of a MediaStream object

[wpp]

I'm basically trying to change the VideoTrack of a MediaStream object.

I have a MediaStream object `__o_jsep_stream_audiovideo` which is created by [the sipml library](https://code.google.com/p/sipml5/).

It has *one* AudioTrack and *one* VideoTrack.

At first the VideoTrack comes from the users camera (e.g `label: "FaceTime Camera"`).

Now I'm trying to switch/exchange the VideoTrack with that from another stream.

The other stream (`streamB`) originates from Chromes ScreenCapture api (`label: "Screen"`)

I tried:

`__o_jsep_stream_audiovideo.addTrack(streamB.getVideoTracks()[0])`

which doesn't seem to have any effect.

I must be missing something obvious could you point me in the right direction?

I'm running

- Chrome (Version 34.0.1847.131) and

- Canary (Version 36.0.1976.2 canary)

- OSX 10.9.2

Note I also asked this question on stackoverflow (better formatting):

http://stackoverflow.com/questions/23497037/change-the-videotrack-of-a-mediastream-object?noredirect=1#comment36034301_23497037

[Vikas]

Hi,

Did you try use the removeTrack() method to remove the track first and then do addTrack()? Also I think you would need to renegotiate as well.

/Vikas

[Mamadou]

This static variable was used as a workaround to cache the stream when the site is not using "https" scheme (to avoid asking permission to access audio/video device for each call). You must not try to use it and it'll be removed in the next versions. The MediaStream object you've to change is "o_local_stream" from "tmedia_session_jsep" prototype. This is a member reference and each session has it's own MediaStream object.

[wpp]

@Vikas yes I was able to change the videoTrack, it seems like the addtrack and removetrack events (https://developer.mozilla.org/en-US/docs/WebRTC/MediaStream_API) fired and needed to be handled.

@Mamadou Thank you for that insight (and all of your hard word on sipml and the forums! <3)

I will keep in mind that "__o_jsep_stream_audiovideo" will be removed in the future.

It was suggested to me that the "add/removeTrack" implementations are still very fragile and I should try to

"add the separate mediastream to the peer connection so that it can fire a re-negotiation and handle the streams"

(because the "add/removeTrack" do not fire a negotiationneeded event - https://code.google.com/p/webrtc/issues/detail?id=1565).

Can you tell me how I could manually re-negotitate the peer?

(https://code.google.com/p/webrtc/issues/detail?id=871&q=track&colspec=ID%20Pri%20Mstone%20ReleaseBlock%20Area%20Status%20Owner%20Summary)

Thanks for your help!