how to get the video resolution from pipeline

[zhi]

Hi guys,


I am newbin to gstreamer, and want to know how to get the video resolution (width,height) from pipeline as below:


GstElement *pipeline = gst_parse_launch("rtspsrc name=src latency=0 ! decodebin name=dec ! appsink name=sink", &error);


when receiving the video data from appsink (new-sample), i need to know the resolution of video go ahead!


I have tried to research the signal of decodebin, and don't know how to do.


thanks in advance
-zhi
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