[Webkit-unassigned] [Bug 235030] New: There is a big delay of video media stream if we share screen by getDisplayMedia in Safari from different MacOS desktops

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235030

            Bug ID: 235030
           Summary: There is a big delay of video media stream if we share
                    screen by getDisplayMedia in Safari from different
                    MacOS desktops
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yafan at cisco.com
                CC: youennf at gmail.com

If we share screen by API "getDisplayMedia" in Safari on different MacOS desktops, there will be a big delay in the shared video media streaming.
In other words, If we share screen in Safari in same desktop, that’s ok.   

The problem is found on Safari15, MacOS 11.x/12.x with Intel CPU. 


# Steps:

1. Alice join an online meeting by Safari
2. Bob also join the online meeting by other browsers, such as Chrome, Firefox or Safari.
3. Alice start to share her screen, auto play a PPT or video clip, such as https://www.youtube.com/watch?v=b96TnabpVyo in full screen or in another desktop



# Expect Result:

Bob should see shared screen video normally.

# Actual Result:

After a while, Bob see shared screen video freeze frequently, sometimes, freeze time exceeds 60 seconds.

I wrote an example to duplicate the issue: https://github.com/walterfan/webrtc_remote_sharing

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