appsrc fed data python

[troywang]

hi all：
I wanna using python gstreamer to do something。I use appsrc。  

appsrc.connect('need-data',need_data)


def need_data(self,src, need_bytes):
        self.data = self.stream_queue.dequeue()
        src.emit('push-buffer', self.data)


I wanna insert self.data into appsrc,But it told me needing Gst.buffer
data,what should I do? 	



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