[Webkit-unassigned] [Bug 234743] New: Video disappears after calling play() until loaded even with poster present

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234743

            Bug ID: 234743
           Summary: Video disappears after calling play() until loaded
                    even with poster present
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hello at zhukov.io

Steps to reproduce:
- Open test page https://jsfiddle.net/e8rwja10/1/.
- Click on the video
- Image disappears for some time(up to a second), then reappears again (causing a flash/blink) and video starts playing. Also sometimes the element height decreases and and makes content below to jump for a second.

Expected behavior: the video element should display poster and retain its dimensions until enough data is loaded to show the first video frame and calculate video dimensions. Then it should seamlessly switch to displaying video. Same way it works in Safari 13.1 and latest Chrome / Firefox.

Possibly related bug: https://bugs.webkit.org/show_bug.cgi?id=226960. But mine happens on Safari on desktop and also was introduced with Safari 15.

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