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Missing elements/plugins like x264enc and mad

After installing the Arago Gstreamer distribution on a DM365 on the Leopard board, and attempting to follow the Example GStreamer Pipelines document,

I have found that:

1)  attempting to initiate the stream in the DM365 section results in the error:
WARNING: erroneous pipeline: no element "x264enc"

How is this element or plugin installed?

2) Every command issued to Gstreamer results in the following warning:

(gst-launch-0.10:1468): GStreamer-WARNING **: Failed to load plugin '/opt/gstreamer/lib/gstreamer-0.10/libgstmad.so': /opt/gstreamer/lib/libid3tag.so.0: undefined symbol: id3_frametype_obsolete

How is this warning eliminated ?

3) From the Gstreamer FAQ examples,

gst-launch filesrc location=thesong.mp3 ! mad ! audioconvert !audioresample ! osssink

yields the error:

WARNING: erroneous pipeline: no element "mad"

How is the "mad" element installed ?

4)  gst-launch -v filesrc location=/thesong.mp3 ! TIAuddec1 genTimeStamps=FALSE engineName=codecServer codecName=mp3dec ! alsasink

yields the error:

gst-launch-0.10: BufTab.c:440: BufTab_getNumBufs: Assertion `hBufTab' failed.

 

Have these errors any solutions which have been established so far ?