Then it means, I can't set this property through gst-launch, 
  but create the element and set it to playbin in programming language (C, 
python, etc.).
  
  Thanks.
  
  
  >-----Original Message-----
  >From: Zhao Liang-E3423C [mailto:e34...@motorola.com]
  >Sent: 2009年2月26日 11:14
  >To: Zhao, Halley; Discussion of the development of GStreamer; Michael Smith
  >Cc: gstreamer-embedded@lists.sourceforge.net
  >Subject: RE: [gst-embedded] [gst-devel] can playbin handle the
  >sinkwithdecoding functions?
  >
  >GST_TYPE_ELEMENT, that means the "video-sink" is a GstElement,  actually
  >it should be a GstElement pointer and the default value is NULL.
  >
  >You need to create the videosink element externally, and set the pointer
  >to this property. You can refer totem sourcecode.
  >
  >Zhao Liang
  >
  >-----Original Message-----
  >From: Zhao, Halley [mailto:halley.z...@intel.com]
  >Sent: Thursday, February 26, 2009 11:08 AM
  >To: Zhao Liang-E3423C; Discussion of the development of GStreamer; Michael
  >Smith
  >Cc: gstreamer-embedded@lists.sourceforge.net
  >Subject: RE: [gst-embedded] [gst-devel] can playbin handle the
  >sinkwithdecoding functions?
  >
  >  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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