[Webkit-unassigned] [Bug 183214] New: [GTK] compositing/video/poster.html: video bar inconsistently filled after 'canplaythrough'

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183214

            Bug ID: 183214
           Summary: [GTK] compositing/video/poster.html: video bar
                    inconsistently filled after 'canplaythrough'
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

The following test has a ImageOnlyFailure flake:

compositing/video/poster.html

https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r229090%20(5649)/compositing/video/poster-diffs.html

It contains this code:

<video controls id="v" poster="../resources/simple_image.png"></video>
<script>
var v = document.getElementById("v");
if (window.testRunner) {
    testRunner.waitUntilDone();
    v.addEventListener("canplaythrough", function() {
        testRunner.notifyDone();
    });
}
v.setAttribute("src", findMediaFile("video", "../resources/video"));
</script>

The video poster looks perfectly fine, the problem is with the controls; particularly the bar.

notifyDone() is called after the "canplaythrough" event. At that point, enough video should be buffered for smooth playback, but most of the time when the screenshot is taken the bar is still empty.

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