hi Sebastian, Thanks your suggestion! I would try gst_app_sink_get_caps to get the caps, -- View this message in context: http://gstreamer-devel.966125.n4.nabble.com/The-Interface-porting-between-the-0-10-and-1-0-GstCaps-tp4677566p4677570.html Sent from the GStreamer-devel mailing list archive at Nabble.com.