[Webkit-unassigned] [Bug 226960] New: Video poster disappears prematurely on play, leaving transparent video element.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226960

            Bug ID: 226960
           Summary: Video poster disappears prematurely on play, leaving
                    transparent video element.
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: johannes.odland at nrk.no

Created attachment 431302

  --> https://bugs.webkit.org/attachment.cgi?id=431302&action=review

Video showing poster disappearing prematurely

Overview:

In the latests versions of Safari on iOS the poster disappears before the video itself is ready to play.
The background is then showing through for a while, causing a flash when starting videos. 

The video element should switch seamlessly from poster to video.


Steps to reproduce: 

1. Go to test page https://codepen.io/johannesodland/pen/XWMNvdW
2. Press play


Actual results: 

Poster disappears prematurely once user presses play, leaving a transparent element with the background showing through. 
Video appears later once it has enough data to play.

Expected results: 

Poster is visible until video is ready to play, switching seamlessly to video

Build and hardware:

Safari on iOS 14.6
iPhone 11 Pro

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