更改MediaStream对象的VideoTrack [英] Change the VideoTrack of a MediaStream object

问题描述

简而言之：我试图更改 MediaStream 对象的 VideoTrack 。

（文档：，并且MediaStream也存在两个 chrome中的相同类型。

您应该将单独的媒体流添加到对等连接，以便它可以触发重新协商并处理流。 Chrome中的轨道添加/删除功能非常幼稚，并非非常细小，您应该尽可能远离它。

In a Nutshell: I'm trying to change the VideoTrack of a MediaStream object.

(Documentation: https://developer.mozilla.org/en-US/docs/WebRTC/MediaStream_API)

I have a MediaStream object __o_jsep_stream_audiovideo which is created by the sipml library.

__o_jsep_stream_audiovideo looks like this:

So it has one AudioTrack and one VideoTrack. At first the VideoTrack comes from the users camera (e.g label: "FaceTime Camera").

According to the Documentation:

A MediaStream consists of zero or more MediaStreamTrack objects, representing various audio or video tracks.

So we should be fine adding more Tracks to this Stream.

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 also tried assigning the videoTracks directly (which was desperate I know).

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

解决方案

Adding and removing tracks on a MediaStream object do not signal a renegotiation and there are also issues with a MediaStream having two tracks of the same type in chrome.

You should probably just add the separate mediastream to the peer connection so that it can fire a re-negotiation and handle the streams. The Track add/remove functionality in chrome is very naive and not very granular and you should move away from it as much as you can.

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