[Bug 758212] New: playbin adds the template caps on autoplug-query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758212

            Bug ID: 758212
           Summary: playbin adds the template caps on autoplug-query
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ystreet00 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Right, so attempting to select some caps feature vs not with a capsfilter
doesn't seem to work correctly as playbin adds the template caps to the result
of the caps query when going through the autoplug-query mechanism.

e.g. a pipeline on android like
playbin uri=uri video-sink='video/x-raw ! glimagesink'

Will fail to negotiate as amcvideodec will see that GLMemory is supported (from
amcvideodec's template caps) and attempt to output GL which sends a caps event
with GLMemory features which the caps filter outright refuses (understandably).

git blame points to the following commit however there isn't any justification
as to why.

commit 45dfceacdb6506a001d435c94ba160389264f3dd
Author: Matthieu Bouron <matthieu.bouron at collabora.com>
Date:   Thu Feb 20 20:01:30 2014 +0000

    playbin: improve autoplug_query_caps return

    Makes autoplug_query_caps return
    downstream_caps + intersect_first(filter_caps, element_caps)

    https://bugzilla.gnome.org/show_bug.cgi?id=724828

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