gst_element_factory_make return null

[Aaron]

Hi,all

     I have ported the gstreamer to the ics.now i have a test file ,use the
gst_element_factory_make("h264parse","parse"),the function return null,but 
gst_inspect can find the plugin and use the same plugin   the gst-launch 
run well. so what does the functioin rely to? 

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