how to get video stream data(decoded) from video decoder

[jojo]

Hi, 
I am a newbie of the gstreamer framework,

I launched a pipeline with "appsrc name=test ! image/jpeg ! videodec ! v4lsink name=vsink",

and i want to get video decoded data (e.g. NV12) from this pipeline, i have read the "GStreamer Application Development Manual" and 

have no found any idea for my target.

Someone could give me any hint ?

Thanks,

- Jojo

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