Disabling audio/video track freezes video instead of stopping it (black frames).

Needs root cause Issue #15444255 • Assigned to Gurpreet V.


Shawinder S.
Jan 12, 2018
This issue is public.
Found in
  • Microsoft Edge
Standard affected
Media Capture and Streams

Needs root cause
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Reported by 1 person

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Steps to reproduce

  1. Run attached index.html.
  2. Click start button to start the media stream.
  3. Click Mute button to mute the stream.
  4. Video freezes instead of showing black screen.

Specs can be seen at this link

The result for the consumer is the same in the sense that whenever
MediaStreamTrack is muted or disabled (or both) the consumer gets
zero-information-content, which means silence for audio and black
frames for video.

Following code snippet is used for muting the audio/video.

window.stream.getTracks().forEach((t) => {
    console.log('Mute track: ', t);


1 attachment

Comments and activity

  • Microsoft Edge Team

    Changed Assigned To to “James M.”

  • Hello,

    Thank you for providing this information about the issue. After thorough testing, we are unable to reproduce this problem in Edge. Please test this behavior in our latest public stable build 16299.

    Best Wishes,
    The MS Edge Team

  • Hi James,

    I am already testing it on latest edge 41.16299.15.0.

    I have created a screenshare to make it more clear. You can see in the screencast that clicking on mute button freezes the video instead of turning it to black as per the specs.

    Please check the attached [screenshare video] https://1drv.ms/v/s!AkzSgRyM9-q5iSG9gopyLhFFw2sw) to see the actual behavior.

  • Hello,

    Thank you for providing additional information about the issue. We are able to reproduce the problem but find your sample exhibits the same behavior in other browsers.

    This does not seem to be an Edge related issue. Please update this case if you can provide new information for us to consider.

    Best Wishes,
    The MS Edge Team

  • Hello,

    My mistake; the other browsers are stopping the video and showing a black screen. We will investigate this and provide an update when we have more progress.

    Best Wishes,
    The MS Edge Team

  • Microsoft Edge Team

    Changed Assigned To to “Venkat K.”

    Changed Assigned To from “Venkat K.” to “Jerry S.”

    Changed Status to “Needs root cause”

    Changed Assigned To from “Jerry S.” to “Angelo L.”

    Changed Assigned To from “Angelo L.” to “Gurpreet V.”

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