[gstreamer-bugs] [Bug 589075] New: Changing playbin2 volume doesn't work after sream restarted.

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: 0.10.23
           Summary: Changing playbin2 volume doesn't work after sream
                    restarted.
           Product: GStreamer
           Version: 0.10.23
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: thepizzaking at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


I recently switched my python program to playbin2.
When I play an initial stream on playbin2 the volume seems to work fine, but
when I set the state to gst.STATE_READY and then back to gst.STATE_PLAYING,
attempting to change the volume doesn't have any effect on the output anymore.

While debugging I noticed that reading the volume level from playbin2 still
gives the expected volume level even though the actual output level is
unchanged.
I've also tested with alsa and pulseaudio audio sinks with the same result.

I ran a test in the python console to make sure this wasn't just my bad
programming skills:


Python 2.6.2 (r262:71600, Jul 13 2009, 02:03:19) 
[GCC 4.4.0 20090630 (prerelease)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gst
>>> playbin = gst.element_factory_make('playbin2')
>>> playbin.set_property('uri', $URI)
>>> playbin.set_state(gst.STATE_PLAYING)
<enum GST_STATE_CHANGE_ASYNC of type GstStateChangeReturn>
>>> playbin.set_property('volume',1)
>>> playbin.set_property('volume',.5)
>>> playbin.set_property('volume',.2)
>>> # These volume changes work as expected.
>>> playbin.set_state(gst.STATE_READY)
<enum GST_STATE_CHANGE_SUCCESS of type GstStateChangeReturn>
>>> playbin.set_state(gst.STATE_PLAYING)
<enum GST_STATE_CHANGE_ASYNC of type GstStateChangeReturn>
>>> playbin.set_property('volume',1)
>>> playbin.set_property('volume',.2)
>>> # These volume changes have no effect.
>>> playbin.set_state(gst.STATE_READY)


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