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MediaStream.getTrackById should use a random UUID #41377

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Merged
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Oct 3, 2025
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MediaStream.getTrackById should use a random UUID #41377

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16 changes: 12 additions & 4 deletions files/en-us/web/api/mediastream/gettrackbyid/index.md
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Expand Up @@ -31,12 +31,20 @@ 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.
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.

The example assumes that the IDs of the two tracks are known (for example, from a previous call to {{domxref("MediaStreamTrack.id")}}). In a real application, you might store these IDs when you first obtain the stream, because they are randomly generated in the browser.

```js
stream.getTrackById("primary-audio-track").applyConstraints({ volume: 0.5 });
stream.getTrackById("commentary-track").enabled = true;
const primaryAudioTrack = stream.getTrackById(
"69f8520f-d94e-43f0-8a7c-77b1774f3b8f",
);
const commentaryTrack = stream.getTrackById(
"b5410643-2549-491e-b0f7-f08a4ebe54b8",
);

primaryAudioTrack.applyConstraints({ volume: 0.5 });
commentaryTrack.enabled = true;
```

## Specifications
Expand Down