[Bug 781573] New: vaapidecodebin: fails to restart playback

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781573

            Bug ID: 781573
           Summary: vaapidecodebin: fails to restart playback
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Tested pipeline:
gst-validate-1.0 --set-scenario=change_state_intensive videotestsrc !
vaapih264enc ! vaapidecodebin ! vaapisink

This is because it tries to create vpp/capsfilter and link them again even they
are still alive and linked, it causes error below.

0:00:00.108188099 30892      0x12d6c10 INFO                GST_PADS
gstpad.c:2346:gst_pad_link_prepare: src vaapi-queue:src was already linked to
capsfilter0:sink
0:00:00.108207649 30892      0x12d6c10 INFO                GST_PADS
gstpad.c:2467:gst_pad_link_full: link between vaapi-queue:src and
capsfilter1:sink failed: was linked

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