MediaStream.getTrackById()

The MediaStream.getTrackById() method returns a MediaStreamTrack object representing the track with the specified ID string. If there is no track with the specified ID, this method returns null.

Syntax

var track = MediaStream.getTrackById(id);

Parameters

id

A DOMString which identifies the track to be returned.

Return value

If a track is found for which MediaStreamTrack.id matches the specified id string, that MediaStreamTrack object is returned. Otherwise, the returned value is null.

Example

This example activates a commentary track on a video by ducking the audio level of the main audio track to 50%, then enabling the commentary track.

stream.getTrackById("primary-audio-track").applyConstraints({ volume: 0.5 });
stream.getTrackById("commentary-track").enabled = true;

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
getTrackById
26
12
49
No
No
11
37
26
49
No
11
1.5

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/MediaStream/getTrackById