[Webkit-unassigned] [Bug 227982] New: Vimeo video jerky with getUserMedia

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227982

            Bug ID: 227982
           Summary: Vimeo video jerky with getUserMedia
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sunlimet at ymail.com
                CC: cdumez at apple.com

Vimeo video is jerky with getUserMedia.

- On an iPhone with OS 14.5, go to https://codepen.io/sunlimet/pen/yLbgOEx
- Button share, then "Add to Home Screen"
- Open PWA, press play = video is lagging
- As you can see, there's only the Vimeo iframe and a navigator.mediaDevices.getUserMedia

Android do not have this issue, Chrome either.
Can reproduce on old IPhones (SE first and second generation, iPhone 6), but it's ok on iPhone 11

In Safari standalone (not PWA), it is better but it's also lagging

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