Diff:
libgstreamer-1.0.so 1.4.5 (x86_64)
libgstreamer-1.0.so 1.5.1 (x86_64)

ABI
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Contents

Name	GstPadProbeReturn()(GstPad, GstPadProbeInfo*, gpointer)
Type	FUNCPTR
Size	8
Usage	The type is used by 1 symbol.
Status	UNCHANGED