[Webkit-unassigned] [Bug 240604] New: [iOS] Video starts playback with wrong object-fit on first frame on iOS 15.5

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240604

            Bug ID: 240604
           Summary: [iOS] Video starts playback with wrong object-fit on
                    first frame on iOS 15.5
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mszylkowski at google.com

Created attachment 459556

  --> https://bugs.webkit.org/attachment.cgi?id=459556&action=review

Screen recording of video jumping in size due to object-fit: cover

When playing a video with object-fit: cover on Webkit (iOS 15.5, reproduced on Chrome & Safari) the first frame of the video gets shown with object-fit: contain (more zoomed out) and then the rest of the video plays with the proper object-fit (zoomed in, correct size). This results in a very visible jump in size of any video with the object-fit: cover CSS rule.

Can be reproduced with a minimal example: https://codepen.io/mszylkowski/pen/eYVWBWL (video attached)

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