<div dir="ltr">Hey, <div> </div><div>1 - You are not creating any identity element in your pipeline.</div><div>2 - You're trying to set the handoff cb on your autovideosink, not on your (yet to be created) identity element. </div><div> </div><div>Cheers</div></div><div class="gmail_extra"> <div class="gmail_quote">2015-04-07 8:50 GMT+02:00 Mayank Agarwal <<a href="mailto:mayank77fromindia@gmail.com" target="_blank">mayank77fromindia@gmail.com</a>>: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, I have modified basic tutorial two to include identity element but i am not able to get the callback called. Here is the example #include <gst/gst.h> static void handoff(GstElement *object, GstBuffer *arg0, GstPad *arg1, gpointer user_data) { printf("comes here"); } int main(int argc, char *argv[]) { GstElement *pipeline, *source, *sink; GstBus *bus; GstMessage *msg; GstStateChangeReturn ret; GstElement *identity; /* Initialize GStreamer */ gst_init (&argc, &argv); /* Create the elements */ source = gst_element_factory_make ("videotestsrc", "source"); sink = gst_element_factory_make ("autovideosink", "sink"); /* Create the empty pipeline */ pipeline = gst_pipeline_new ("test-pipeline"); if (!pipeline || !source || !sink) { g_printerr ("Not all elements could be created.\n"); return -1; } /* Build the pipeline */ gst_bin_add_many (GST_BIN (pipeline), source, sink, NULL); if (gst_element_link (source, sink) != TRUE) { g_printerr ("Elements could not be linked.\n"); gst_object_unref (pipeline); return -1; } /* Modify the source's properties */ g_object_set (source, "pattern", 0, NULL); g_object_set(G_OBJECT(sink), "signal-handoffs", TRUE, NULL); g_signal_connect(sink, "handoff",G_CALLBACK(handoff), NULL); /* Start playing */ ret = gst_element_set_state (pipeline, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) { g_printerr ("Unable to set the pipeline to the playing state.\n"); gst_object_unref (pipeline); return -1; } /* Wait until error or EOS */ bus = gst_element_get_bus (pipeline); msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS); /* Parse message */ if (msg != NULL) { GError *err; gchar *debug_info; switch (GST_MESSAGE_TYPE (msg)) { case GST_MESSAGE_ERROR: gst_message_parse_error (msg, &err, &debug_info); g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message); g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none"); g_clear_error (&err); g_free (debug_info); break; case GST_MESSAGE_EOS: g_print ("End-Of-Stream reached.\n"); break; default: /* We should not reach here because we only asked for ERRORs and EOS */ g_printerr ("Unexpected message received.\n"); break; } gst_message_unref (msg); } /* Free resources */ gst_object_unref (bus); gst_element_set_state (pipeline, GST_STATE_NULL); gst_object_unref (pipeline); return 0; } and the errors i am getting are: (btutorialtwo:3807): GLib-GObject-WARNING **: g_object_set_valist: object class 'GstAutoVideoSink' has no property named 'signal-handoffs' (btutorialtwo:3807): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.40.2/./gobject/gsignal.c:2462: signal 'handoff' is invalid for instance '0x9950018' of type 'GstAutoVideoSink' although videotestsrc is playing fine. If this is not the correct way of using identity element any example/links of using identity element using which i can be able to calculate video frame rate. Regards Mayank _______________________________________________ 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> </div>