[Webkit-unassigned] [Bug 219318] New: Black background on video element on incoming phone calls

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219318

            Bug ID: 219318
           Summary: Black background on video element on incoming phone
                    calls
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: german.goldenstein at gmail.com
                CC: youennf at gmail.com

Created attachment 414963

  --> https://bugs.webkit.org/attachment.cgi?id=414963&action=review

Screenshot - no video

Hello! I see a bug in iOS Safari 14, that shows a black background on a video element after I receive a non-intrusive phone call.


Steps to reproduce it.

1) Join a session in app.rtc from iOS Safari
2) Join the same session from another browser
3) once Safari is publishing video and receiving video from the other peer, stop all the local tracks.
   You can do this by running this line on the console: 
   ```
   document.querySelectorAll('video')[0].srcObject.getTracks().forEach(t => t.stop())
   ```
   For this, you will need to connect your iphone to your mac and use the remote safari console.
   Make sure you only see the remote video and audio.
4) Now call your phone and reject the call.
5) The video now shows a black background. The video and audio tracks are enabled and not muted, and the video element is not paused. See attached screenshot.



Could you please advise if there's a workaround? 
Thanks!!

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