[Webkit-unassigned] [Bug 259273] New: Unexpected mute event on audio track seen on Safari 16.5, no issues on safari 16.4

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259273

            Bug ID: 259273
           Summary: Unexpected mute event on audio track seen on Safari
                    16.5, no issues on safari 16.4
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Intel)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vinayak.kulkarni at bluejeans.com
                CC: youennf at gmail.com

Created attachment 467060

  --> https://bugs.webkit.org/attachment.cgi?id=467060&action=review

Microphone icon paused in status bar.

Hi, we have a web application which has capabilities for audio-video conferencing using WebRTC and also ability to stream a video from cloud.
We are seeing a new issue with Safari v16.5. No issues seen with Safari v16.4.
Scenario:
1. Client calls getUserMedia and gets access to mic and camera tracks
2. Video Streaming from cloud starts, browser starts to render the video and playout the audio of the file.
3. Once the video streaming is paused, the onmute event on audio track is triggered.
>From the status bar on the browser, it looks like microphone use has been paused too. Screenshot attached.
4. Once the video streaming is resumed, the onunmute event on audio track is triggered.

This behavior is seen on Safari v16.5, no issues were reported with earlier safari versions (eg v16.4)
This behavior is causing issues because we expect the track mute status to not change under these cases.
Can you please help me understand why this happens or point in the right direction to fix this, if it can be fixed from the client side.
>From our investigation, we didn't find anything that has got do with the track when video streaming operations are performed.

Issue seen on:
Safari - Version 16.5 (18615.2.9.11.4) / Mac OS Version - 13.4 (22F66)
Intel based Mac - 2.6 GHz 6-Core Intel Core i7

Please let me know if you need more information:

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