play rtsp file failed

[lujing_2897]

Hi, 
      I meet a problem, when I want to a rtsp media file, the playbin say this to me: 
 ERROR: from element /GstPlayBin:playbin0/GstDecodeBin:decodebin1: A H264 video RTP depayloader plugin is required to play this stream, but not installed.

      And I can not find the RTP plugin, why?

   my pipeline is:
 gst-launch playbin uri="rtsp://124.160.192.14:554/sxtest/avater_I_see_you_200k.mp4?userid=18605765431&userip=&spid=61111&pid=8036999801&cid=9012200020090918002400&subcontentid=9012200020090918002402&contenttype=1&mimetype=video%2F3gpp&subcontentsize=4415256&timestamp=20090916205340&life=86400&preview=1&proxy=0&oma=0&chargeuserid=&enkey=434258248529c2d7ed1ffec46d70b3d9"

   Pls help me ASAP.

omego
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