Hi How about adding new callback which can be called instead of factory_create inside decodebin? I think this has more extensible than adding enum. GstElement* el; if (callback) el = callback(name, ...); else el = factory_create(); Now, you can do anyhing in callback, avoid or jus use pre-created. <div class="gmail_quote">2015. 5. 6. 오후 12:28에 "ruchikachaddha" <<a href="mailto:ruchika.chaddha@gmail.com">ruchika.chaddha@gmail.com</a>>님이 작성: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks Tim for your advice. Would this also work if the intension is simply to avoid factory_create inside encodebin for a particular factory? In my context, factory_create initializes hardware decoder which I want to avoid doing inside decodebin for some reason. -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Decodebin-query-autoplug-externally-created-elements-tp4671790p4671802.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Decodebin-query-autoplug-externally-created-elements-tp4671790p4671802.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div>