[gst-devel] How to use vorbisenc and vorbisdec to record?

[linguang_wang@astrocom.cn]

Hi all!
   I used gst−launch osssrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=input.ogg
records sound from my audio input and encodeed it into an ogg file .But when I playbacked as 
gst-launch filesrc location=input.ogg ! oggdemux ! vorbisdec ! audioconvert ! osssink ,I can't
hear nothing.I used gstreamer at version gstreamer-0.10.11.
   I playbacked input.ogg by GoalWav ,the result is same.                          
   And I used gst-launch -v osssrc ! wavenc ! filesink location=mymusic.wav ,
   playbacked as gst-launch -v filesrc location=mymusic.wav ! wavparse ! osssink is ok.
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   What is wrong?  I'm in a pickle and one of you guys might be able to help me out.
   Thanks!