Where can I get helixbin plugin

[yinxb]

Hi

  I am a new comer to gstreamer.
  Recently,I used the tracker to check the rm/rmvb videofiles in Meego.
Because the tracker uses the tracker-extract-helix to get the rm/rmvb
metainfo,code pieces are as followed:
------
......
extractor->playbin = gst_element_factory_make ("helixbin", "playbin");
......
------
But there is not helixplugin in Meego,
So,Where can I get the gstreamer helixbin plugins? 

ps
rm/rmvb files can be played from the commandline using playbin2.

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