An addtrack is fired when the browser adds a track to a MediaStream (such as when a RTCPeerConnection is renegotiated or a stream being captured using HTMLMediaElement.captureStream() gets a new set of tracks because the media element being captured loaded a new source.
The addtrack event does not get fired when JavaScript code explicitly adds tracks to the stream (by calling addTrack()).
An event handler for this event can be added by setting the MediaStream.onaddtrack property, or by calling addEventListener() on the MediaStream which you want to monitor for track additions.
MediaStreamTrackEventMediaStreamThis event implements the properties of MediaStreamTrackEvent.
This event implements the methods of MediaStreamTrackEvent.
| Specification | Status | Comment |
|---|---|---|
| Media Capture and Streams The definition of 'addtrack' in that specification. | Editor's Draft |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | 50 (50) | No support | (Yes) | ? |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | 50.0 (50) | No support | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/Events/addtrack