video-sink is GstElement? But I saw the following codes:
  
  gst_play_bin_class_init (GstPlayBinClass * klass)
  {
  ...
    g_object_class_install_property (gobject_klass, ARG_VIDEO_SINK,
        g_param_spec_object ("video-sink", "Video Sink",
            "the video output element to use (NULL = default sink)",
            GST_TYPE_ELEMENT, G_PARAM_READWRITE));
  ...
  }
  
  >-----Original Message-----
  >From: Zhao Liang-E3423C [mailto:e34...@motorola.com]
  >Sent: 2009年2月24日 10:56
  >To: Discussion of the development of GStreamer; Michael Smith
  >Cc: gstreamer-embedded@lists.sourceforge.net
  >Subject: Re: [gst-embedded] [gst-devel] can playbin handle the sinkwith
  >decoding functions?
  >
  >The type of Video-sink is GstElement, not string.
  >
  >-----Original Message-----
  >From: Zhao, Halley [mailto:halley.z...@intel.com]
  >Sent: Tuesday, February 24, 2009 10:46 AM
  >To: Discussion of the development of GStreamer; Michael Smith
  >Cc: gstreamer-embedded@lists.sourceforge.net
  >Subject: Re: [gst-devel] [gst-embedded] can playbin handle the sinkwith
  >decoding functions?
  >
  >  My gst version is 0.10.18 (Ubuntu hardy).
  >  I saw that playbin has the property of "video-sink", but my try fails:
  >  gst-launch playbin -v -v uri=file:///home/halley/media/video/test.avi
  >video-sink=xvimagesink
  >  The error message is:
  >  WARNING: erroneous pipeline: could not set property "video-sink" in
  >element "playbin10" to "xvimagesink"
  >
  >  Even when I try to use playbin2 and fakesink, it always give the same
  >error.
  >
  >  Where is my problem, thanks.
  >
  >  >-----Original Message-----
  >  >From: Michael Smith [mailto:msm...@xiph.org]
  >  >Sent: 2009年2月21日 12:31
  >  >To: Liang Zhao
  >  >Cc: gstreamer-embedded@lists.sourceforge.net;
  >  >gstreamer-de...@lists.sourceforge.net
  >  >Subject: Re: [gst-devel] [gst-embedded] can playbin handle the sink
  >with
  >  >decoding functions?
  >  >
  >  >On Fri, Feb 20, 2009 at 6:03 PM, Liang Zhao <liangzhao....@gmail.com>
  >wrote:
  >  >> Hi Mke,
  >  >>
  >  >> Thank you.
  >  >>
  >  >> So the only way is to use playbin2?  what is the difference on
  >intefaces,
  >  >> properties and signals between playbin2 and playbin?
  >  >> I find most of them are same.
  >  >
  >  >The only sensible approach (assuming you want to reuse existing code,
  >  >rather than writing something from scratch yourself) is to switch to
  >  >playbin2.
  >  >
  >  >The documentation can help you with the differences - you're right,
  >  >most things are similar.
  >  >
  >  >Mike
  >  >
  >
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