[Webkit-unassigned] [Bug 183362] New: [GTK] [gstreamer] video won't unpause when built with -DUSE_GSTREAMER_GL=OFF

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183362

            Bug ID: 183362
           Summary: [GTK] [gstreamer] video won't unpause when built with
                    -DUSE_GSTREAMER_GL=OFF
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P3
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jbicha at ubuntu.com
                CC: bugs-noreply at webkitgtk.org

webkit2gtk 2.19.91
or webkit2gtk 2.18.6

Ubuntu has to use -DUSE_GSTREAMER_GL=OFF at least for Ubuntu 16.04 LTS since Ubuntu can't install the "bad" gstreamer plugin set by default. (By the way, Ubuntu 18.04 LTS needs graphene to be promoted to Ubuntu "main" but there is a backlog for those kind of requests.)

When webkit2gtk is built with this option, videos do not unpause correctly.

Test Case
=========
>From Ubuntu, Open the Help app (yelp)
Click Getting Started
Play one of the videos.
Press Pause
Press Play.
The video stays stuck on the paused frame, while the sound keeps playing. Also the timer 0:07/0:34 advances like normal.
Seek works (clicking a different point in the video progress bar, but the video still remains stuck on the paused frame.


This is also reproducible with Epiphany on YouTube.

Other Info
==========
This was split off from https://bugs.webkit.org/show_bug.cgi?id=183085 which I guess is more about the seek feature not working at all, especially for webm videos.

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