How to add audio part in a pipeline dynamically?

cfd new via gstreamer-devel <[email protected]>
Newsgroups gmane.comp.video.gstreamer.devel
Message-ID <[email protected]> 
I tried to add audio part in a rtsp pipeline dynamically withauto audio_bin = gst_parse_bin_from_description( "queue ! decodebin ! audioconvert ! autoaudiosink", TRUE );My problem is I do not want to handle different audio forms manually. Therefore, decodebin is applied here. However, audio_bin can not be linked to the pipeline. Does the pad of decodebin need to be handled? 
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