Pass extra information between elements in a pipeline

frank82 francescomarino84627 at
Thu Dec 4 00:18:52 PST 2014

you can use GstMeta API. You can find reference in GStreamer Plugin Writer's
Manual at par 15.3.
Basically, after defining the metadata API , you can add extra info to the
GstBuffer in the my_decoder and get the info in extra_element. 

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