[Webkit-unassigned] [Bug 180765] New: First frame of mp4 not shown before playback

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Dec 13 12:09:13 PST 2017


            Bug ID: 180765
           Summary: First frame of mp4 not shown before playback
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dunstan at gmail.com

Created attachment 329243

  --> https://bugs.webkit.org/attachment.cgi?id=329243&action=review

Screencast of safari playing back the test video

(I don't know which version of Safari I have on my phone. It's whatever comes by default with iOS 11.2)

I have a 1.6mb mp4 set to play on a loop. In Safari on iOS 11.2 (on my iPhone) the first frame isn't shown before playback starts. The video just displays as a white box with the play button in the middle. Jer Noble reported that the video displays the first frame just fine on his phone.

Test page:

<!doctype html>
<html lang="en">
  <meta charset="utf-8">
   div {
    width: 50%;
   video {
    width: 100%;
  <video controls src="hand.mp4" loop muted playsinline preload="auto"></video>

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