[Webkit-unassigned] [Bug 254731] New: [GTK][GStreamer] VA+DMABuf higher than expected usage for AV1 videos

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=254731

            Bug ID: 254731
           Summary: [GTK][GStreamer] VA+DMABuf higher than expected usage
                    for AV1 videos
           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 an AV1-hardware-decoding-capable machine,
1. Go to YouTube -> Settings -> Performance and Playback -> Always prefer AV1
2. Load an AV1 video
3. Observe the CPU usage of the WebProcess
It needs around 5% for (suspected) VA+DMABuf AV1 decoding. This is much higher than confirmed hardware decoding (Clapper with vaav1dec uses about 2-3% CPU) but also significantly lower than confirmed software decoding (~13%). VP9 works as expected at 2-3%.

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