[Bug 731830] New: Output-selector switching active-pad doesn't work when you directly connected to sink.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=731830
  GStreamer | common | 1.x

           Summary: Output-selector switching active-pad doesn't work when
                    you directly connected to sink.
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: common
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: sukesh.adiga at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Pipeline look like 
gst-launch-1.0 filesrc location=/filepath ! wavparse ! output-selector name=os
os. ! alsasink async=true os. ! alsasink async=false

I am trying this pipeline through code. First I set one of alsasink async=true
other as async=false to preroll. After that I am setting both the sinks
async=false.
We output-selector is connected to prerolled sink playback is fine. But when it
is connected to othersink (i.e at the beginning or once i change active pad to
this un prerolled sink) it is not playing and giving below error: 

basesink gstbasesink.c:2198:gst_base_sink_do_preroll:<sink2> prerolling
object 0xb2403370
basesink gstbasesink.c:2217:gst_base_sink_do_preroll:<sink2> preroll
buffer 0:00:09.800000000
audiobasesink gstaudiobasesink.c:1104:gst_audio_base_sink_preroll:<sink2>
ringbuffer in wrong state
audiobasesink gstaudiobasesink.c:1105:gst_audio_base_sink_preroll:<sink2>
error: sink not negotiated.

But when I connected to same with mp3 playback by placing output-selector in
between parser and decoder (... mpegaudioparse ! output-selector name=os os.!
mad ! alsasink os. ! mad ! alsasink)  It works fine for any number of time
switching active-pad of output-selector.
But if you place output-selector after decoder i.e directly to sink. It is
giving same error as above.

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