[Webkit-unassigned] [Bug 202706] New: getDisplayMedia stop working when I change the tab or I minimize safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202706

            Bug ID: 202706
           Summary: getDisplayMedia stop working when I change the tab or
                    I minimize safari
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bertonibrunoeugenio at gmail.com
                CC: youennf at gmail.com

Hello,

I have my Javascript application that has the functionallity to share the screen and it sends the frames threw websockets.

I'm trying to implement the getDisplayMedia function of Safari 13 in order to share my screen and I'm using these contraints in the getDisplayMedia function:

var basicConstraints = {
            video: {
                frameRate: {
                    max: 3
                }
            }
        };

And I have the next scenario:

1) User A open Safari 13 browser
2) User B open Safari 13 browser
3) User A starts sharing his screen
4) User B is able to see User A screen
5) User A changes to another tab or he minimize safari

Expected:
6) User B is able to see the other tab of User A or the browser minimized.

Actual result:
6) User B stop receiving message from webSockets and the sharing screen is freeze.

Another thing that I noticed, is that when user A change to another Tab or minimize the browser, the process "Safari Web Content" starts to decress from 500mb to 12mb (more or less) and the only way that user B can see Usear A screens refreshed again, user A need to stop sharing and start sharing again.

Could be that the browser is consuming less resources to that tab when I lost focus on the tab that I started sharing the screen? or maybe is there another constraint that I need to send in the getMediaDisplay function?

Regards,

Bruno.

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