[Bug 773801] New: Laggy delays temporarily locking up the X server when seeking H264 files with gstreamer-vaapi installed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773801

            Bug ID: 773801
           Summary: Laggy delays temporarily locking up the X server when
                    seeking H264 files with gstreamer-vaapi installed
    Classification: Platform
           Product: GStreamer
           Version: 1.8.3
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nekohayo at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Created attachment 338923
  --> https://bugzilla.gnome.org/attachment.cgi?id=338923&action=edit
totem with GST_DEBUG=*av*:6,*videodec*:6

With H264 .mov files in Fedora 24, I couldn't seek anything without the system
graphics locking up for half a second. ABRT was also complaining about totem
seemingly crashing all the time in the background (although it was not actually
crashing in front of me, I suspect it was the totem thumbnailers for Nautilus),
ABRT identified one of the crashes to be a duplicate of
https://bugzilla.redhat.com/show_bug.cgi?id=1377382

Attached is a debug log.

All I know now is that uninstalling the "gstreamer1-vaapi" distro package (I
have no idea why it was installed) solved the problem, I can now seek without
any micro-lockups.

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