[gst-devel] How to use rtpvorbispay and rtpvorbisdepay?

[linguang_wang at astrocom.cn]

gstreamer-develHi,developers! 
  I want to transfer sound file in the real time cross network. At 
the beginning, I  have a test to transfer a ogg file from 
server to client and then paly it on the client.  I  use UDP and RTP .
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client:
gst-launch -v filesrc location=qiutianbuhuilai.ogg ! rtpvorbispay ! udpsink

ERROR: from element /pipeline0/rtpvorbispay0: Element doesn't implement handling of this stream. 
Please file a bug.
Additional debug info:
gstbasertppayload.c(434): gst_basertppayload_push (): /pipeline0/rtpvorbispay0:
subclass did not specify clock_rate
ERROR: pipeline doesn't want to preroll.

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server:
gst-launch -v udpsrc ! rtpvorbisdepay ! oggdemux !  vorbisdec ! audioconvert ! osssink

WARNING: erroneous pipeline: could not link rtpvorbisdepay0 to oggdemux0
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 I don't know what's wrong here and what can I do to play it .