MediaStream: getTrackById() method
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
js
getTrackById(id)
Parameters
id-
A string 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.
Examples
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.
js
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
BCD tables only load in the browser