[Webkit-unassigned] [Bug 251679] New: [GTK] Playing video causes very high CPU usage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251679

            Bug ID: 251679
           Summary: [GTK] Playing video causes very high CPU usage
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kdwkleung at protonmail.com
                CC: bugs-noreply at webkitgtk.org

On https://wpewebkit.org/blog/05-new-svg-engine.html, there are a few videos encoded in H.264. My hardware has support for accelerated decoding of this codec. However, when using Epiphany to play the videos on the website, CPU usage is very high, as can be seen in the screencast, and there are lots of dropped frames. If the video is downloaded and played in Clapper (Flatpak), a video player, CPU usage is much lower and there are no dropped frames.

Tested:
Epiphany Technology Preview (Flatpak) 44.alpha-32-g481e050e5+, WebKitGTK 2.39.7, GStreamer 1.20.5
Fedora Silverblue 37

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