[Bug 785092] New: 20xH264 Video Decode Render-less CPU Usage spike up to ~70% with flag sync=false

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785092

            Bug ID: 785092
           Summary: 20xH264 Video Decode Render-less CPU Usage spike up to
                    ~70% with flag sync=false
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: peng.c.chen at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

1. Create a simple bash script with the 20x gstreamer execution command (
gst-launch-1.0 -v filesrc location=/videos/1920x1080_10mbps_30fps.mp4 ! qtdemux
! vaapidecode ! fpsdisplaysink video-sink=fakesink text-overlay=false
sync=false)
2. Observed the  CPU usage spike up to 70%
3, Customer is expecting the CPU utilization result should not be so high if
sync=false.Need to further to debug to find out the reason and root cause

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