GStreamer iOS, unable to build pipeline: no element "playbin2"

I'm currently trying to integrate GStreamer on iOS project. I've downloaded gstreamer-1.0-devel-1.2.1-ios-universal.pkg and add GStreamer.framework into the project. I followed tutorials iOS on http://docs.gstreamer.com/display/GstSDK/iOS+tutorial+4%3A+A+basic+media+player, the previous tutorial works fine, but when it comes to create a basic media player, I have always problem with initiating pipeline, below is the code I use ``` -(void) app_function{ GstBus *bus; GSource *timeout_source; GSource *bus_source; GError *error = NULL; GST_DEBUG ("Creating pipeline"); /* Create our own GLib Main Context and make it the default one */ context = g_main_context_new (); g_main_context_push_thread_default(context); /* Build pipeline */ pipeline = gst_parse_launch("playbin2 uri=http://docs.gstreamer.com/media/sintel_trailer-480p.webm", &error); if (error) { gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message); g_clear_error (&error); [self setUIMessage:message]; g_free (message); return; } .... } ``` And I got the error: Unable to build pipeline: no element "playbin2" I equally download the GStreamer for mac, with the same method (gst_parse_launch()), I can launch a internal video player to play a video. I think maybe the plugin (playbin2) is not well installed or configured, I searched everywhere hoping to find a solution, but I didn't find... Any help will be appreciated. Thanks in advance