[Bug 764169] New: Dogslow VP9 4k playback

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764169

            Bug ID: 764169
           Summary: Dogslow VP9 4k playback
    Classification: Platform
           Product: GStreamer
           Version: 1.6.3
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nekohayo at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Totem can't play this at more than ~0.1 fps (or something like that):

http://jeff.ecchi.ca/public/vp9-4k-sample-from-red-dragon-6k.webm

Tested with libvpx 1.4.0. CPU usage suggests it's single-threaded.
VLC plays the file butter-smooth, using as many CPU threads as needed.

Specs are:

- Intel Xeon W3520 @ 2.67GHz × 8
- 24 GB of RAM
- Radeon HD 7770 running the open-source drivers (Gallium 0.4, DRM 2.43.0) on X

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