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.
MediaStream.getTrackById()
Syntax
var track = MediaStream.getTrackById(id);
Parameters
-
id -
A
DOMStringwhich 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
| Specification |
|---|
| Media Capture and Streams # dom-mediastream-gettrackbyid |
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
© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/MediaStream/getTrackById
