javascript 如何从 MediaStream 中删除曲目并“停止”网络摄像头？
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How to remove track from MediaStream and "stop" webcam?
提问by Jonathan Azulay
I'm trying to remove a track from a MediaStream. MediaStream.removeTrack()removes the track from the stream, but the camera light is left on indicating that the camera is still active.
我正在尝试从 MediaStream 中删除曲目。MediaStream.removeTrack()从流中删除轨道，但相机灯仍然亮着，表明相机仍然处于活动状态。
This references a stop()method which I suppose would stop the camera completely, In chrome however I get "Object MediaStreamTrack has no method 'stop'"
这引用了stop()一种我认为可以完全停止相机的方法，但是在 chrome 中我得到了"Object MediaStreamTrack has no method 'stop'"
Is there a way around this or do I have to stop the whole stream and then recreate it with the tracks I don't want gone? As an example, I want to remove the video track while the audiotrack is still there.
有没有办法解决这个问题，还是我必须停止整个流，然后用我不想消失的轨道重新创建它？例如，我想在音轨仍然存在时删除视频轨道。
回答by Anand S
MediaStreamTrack.stop()is now addedto the Chrome.
MediaStreamTrack.stop()现在已添加到 Chrome 中。
MediaStream.stop()is deprecatedin Chrome 45.
MediaStream.stop()被弃用在Chrome 45。
You should use MediaStream.getVideoTracks()to get video tracks and stop the track using MediaStreamTrack.stop()
您应该使用MediaStream.getVideoTracks()来获取视频轨道并使用MediaStreamTrack.stop()
回答by Sam Dutton
You need to call stop() on the MediaStream, not a MediaStreamTrack.
您需要在 MediaStream 上调用 stop()，而不是 MediaStreamTrack。
Take a look at simpl.info/gum. From the console, call stream.stop(): recording stops and the video camera light goes off.
看看simpl.info/gum。从控制台调用stream.stop()：记录停止并且摄像机灯熄灭。
回答by jamix
It looks like the proper way to deal with this issue is to stop your MediaStream, recreate (and reattach) it as an audio-only one and then renegotiate the PeerConnectionsession. Unfortunately, Firefox currently doesn't supportrenegotiation mid-session.
看起来处理这个问题的正确方法是停止您的MediaStream，重新创建（并重新附加）它作为纯音频的，然后重新协商PeerConnection会话。不幸的是，Firefox 目前不支持在会话中重新协商。
The only viable hack is thus to also recreate the PeerConnectionwith the new MediaStreamas suggested here(see "Adding video mid-call").
因此，唯一可行的 hack 也是按照此处的建议重新创建PeerConnection新的（请参阅“添加视频通话中”）。MediaStream
