[Webkit-unassigned] [Bug 276537] New: Media plays with blank screen on first load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=276537

            Bug ID: 276537
           Summary: Media plays with blank screen on first load
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jean-yves.avenard at apple.com

When you play a webm or a <video> using a MediaSource and make use of a poster.
On iPhone, on first load the video will play with a blank screen but audio can be heard.

STR:

on iPhone, open https://jyavenard.github.io/htmltests/tests/130231703/ 

WebM with poster and MSE video with poster will play with a black screen

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