[Bug 642732] New: [playbin2] cannot use gconfaudiosink configured to use custom sink

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=642732
  GStreamer | gst-plugins-base | 0.10.33

           Summary: [playbin2] cannot use gconfaudiosink configured to use
                    custom sink
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.33
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: tskd2 at yahoo.co.jp
         QAContact: gstreamer-bugs at lists.freedesktop.org
      GNOME target: ---
     GNOME version: ---


I wrote a custom sink element, which accepts "audio/mpeg, mpegversion={2,4}",
and it works in these example pipelines.
  gst-launch filesrc location=/foo.aac ! mysink
  gst-launch filesrc location=/foo.aac ! gconfaudiosink  (configured to use
mysink)
  gst-launch playbin2 uri=file:///foo.aac audio-sink=mysink

but, 
  gst-launch playbin2 uri=file:///foo.aac audio-sink=gconfaudiosinnk
does not work.
I read the (kind of similar) bug report of #642274 and 
updated the source code to the latest but the above problem remaind.

I added some debug print to gstswitchsink.c and then ran with
"--gst-debug playsink:5,switchsink:5,gconf:5",
which produced the following output.

0:00:00.024510983 21057       0x8a6080 DEBUG             switchsink
gstswitchsink.c:148:gst_switch_sink_commit_new_kid:<GstSwitchSink at 0xaa2060>
Replacing kid with fakesink
0:00:00.025330352 21057       0x8a6080 DEBUG             switchsink
gstswitchsink.c:209:gst_switch_sink_commit_new_kid:<GstSwitchSink at 0xaa2060>
Creating new ghostpad
0:00:00.025360313 21057       0x8a6080 DEBUG             switchsink
gstswitchsink.c:213:gst_switch_sink_commit_new_kid:<GstSwitchSink at 0xaa2060>
done changing child of switchsink
0:00:00.031025894 21057       0x8a6080 DEBUG                  gconf
gstgconfaudiosink.c:232:gst_gconf_switch_profile:<GstGConfAudioSink at 0xaa2060>
Subscribing to key /system/gstreamer/0.10/default/audiosink for profile 0
0:00:00.031183655 21057       0x8a6080 DEBUG             switchsink
gstswitchsink.c:266:gst_switch_sink_get_caps:<gconfaudiosink0> no kid set.
returns ANY caps.
0:00:00.031205535 21057       0x8a6080 DEBUG             switchsink
gstswitchsink.c:270:gst_switch_sink_get_caps:<gconfaudiosink0> get caps:ANY
WARNING: erroneous pipeline: playbin20 を gconfaudiosink0 へリンクできません(*)
(*) failed to link playbin2 to gconfaudiosink0

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