[gst-devel] Pipeline problems

[Stefan Kost]

hi,

the snippet is incomplete. It would be good if you could provide a compilable
test case. E.g. I can't see what 'screen' is and what you are doing in 'expose'.
Please also note that its not safe to draw to a gtk_window from 'cb_handoff' (it
runs in the pipeline thread).
Beside most of the code below can be written a bit more compact:
- 	gst_bin_add(GST_BIN(pipeline), src);
- 	gst_bin_add(GST_BIN(pipeline), csp);
- 	gst_bin_add(GST_BIN(pipeline), csp2);
- 	gst_bin_add(GST_BIN(pipeline), tee);
- 	gst_bin_add(GST_BIN(pipeline), sink);
- 	gst_bin_add(GST_BIN(pipeline), fakesink);
- 	gst_bin_add(GST_BIN(pipeline), queue);
+       gst_bin_add_many(GST_BIN(pipeline), src, ..., queue, NULL);

Instead of using gst_element_link_filtered() you can create a capsfilter
element, set the caps and then in the end link the whole pipeline via:
gst_element_link_many(src, ..., filter, NULL);

Stefan

omar.crea at jusan.it wrote:
> I wrote a little application for my Nokia N800 that uses a gstreamer
> pipeline into a gtk window: the app show the camera input and permits
> to take a photo when a button is clicked.
> I implemented the pipeline as showed below, but I have a few problems:
> 
> - after a random amount of time (100-150 seconds) the pipeline crashes
>   and the app screen remains blocked.
> - I receive the following messages when I quit the application:
>   barcode_ui[1615]: GLIB WARNING ** default - Unable to get the window id
>   barcode_ui[1615]: GLIB CRITICAL ** GStreamer - gst_element_set_state:
>   assertion `GST_IS_ELEMENT (element)' failed
>   barcode_ui[1615]: GLIB CRITICAL ** GStreamer - gst_object_unref:
>   assertion `((GObject *) object)->ref_count > 0' failed
> 
> 
> 
> ===========================================================================
> 
> Here is the code:
> 
> ===========================================================================
> 
> To init the application:
> 
> 	g_thread_init( NULL );
> 	gtk_init (&argc, &argv);
> 	gst_init(&argc, &argv);
> 	init_dbus();
> 
> ===========================================================================
> 
> GStreamer code:
> 
> 	pipeline = gst_pipeline_new("camera");
> 
> 	src = gst_element_factory_make("gconfv4l2src", "src");
> 	csp = gst_element_factory_make("ffmpegcolorspace", "csp");
> 	csp2 = gst_element_factory_make("ffmpegcolorspace", "csp2");
> 	tee = gst_element_factory_make("tee", "tee");
> 	sink = gst_element_factory_make("xvimagesink", "sink");
> 	fakesink = gst_element_factory_make("fakesink", "fakesink");
> 	queue = gst_element_factory_make("queue", "queue");
> 
> /* Adding objects to pipeline */
> 	gst_bin_add(GST_BIN(pipeline), src);
> 	gst_bin_add(GST_BIN(pipeline), csp);
> 	gst_bin_add(GST_BIN(pipeline), csp2);
> 	gst_bin_add(GST_BIN(pipeline), tee);
> 	gst_bin_add(GST_BIN(pipeline), sink);
> 	gst_bin_add(GST_BIN(pipeline), fakesink);
> 	gst_bin_add(GST_BIN(pipeline), queue);
> 
> 
> 	filter = gst_caps_new_simple(
> 			"video/x-raw-yuv",
> 			"width", G_TYPE_INT, YUV_FILTER_WIDTH,
> 			"height",  G_TYPE_INT, YUV_FILTER_HEIGHT,
> 			"framerate", GST_TYPE_FRACTION, 11, 1,
> 			NULL);
> 
> 	link_ok = gst_element_link_filtered(src, tee, filter);
> 	if (!link_ok) {
> 		printf("Failed to link YUV filter for the video sink\n");
> 		return FALSE;
> 		}
> 	gst_caps_unref(filter);
> 
> 	gst_element_link(tee, csp);
> 	gst_element_link(csp, sink);
> 
> 
> 	filter = gst_caps_new_simple(
> 			"video/x-raw-rgb",
> 			"width", G_TYPE_INT, RGB_FILTER_WIDTH,
> 			"height",  G_TYPE_INT, RGB_FILTER_HEIGHT,
> 			"bpp", G_TYPE_INT, 24,
> 			"depth", G_TYPE_INT, 24,
> 			"framerate", GST_TYPE_FRACTION, FRAMERATE, 1,
> //			"endianess", G_TYPE_INT, G_BYTE_ORDER,
> 			NULL);
> 
> 	gst_element_link(tee, queue);
> 	gst_element_link(queue, csp2);
> 	link_ok = gst_element_link_filtered(csp2, fakesink, filter);
> 	if (!link_ok)
> 		printf("Failed to link RGB filter for the fake sink\n");
> 		return FALSE;
> 		}
> 	gst_caps_unref(filter);
> 
> 
> /* Connect signals */
> 	g_signal_connect(screen, "expose-event", G_CALLBACK(expose), sink);
> 	g_object_set (G_OBJECT (fakesink), "signal-handoffs", TRUE, NULL);
>         g_signal_connect(fakesink, "handoff", G_CALLBACK(cb_handoff), NULL);
> 
>       	gst_element_set_state(pipeline, GST_STATE_PLAYING);
> 
> /* Entering main program */
> 	gtk_widget_show(window);
> 	gtk_main ();
> 
> 
> ===========================================================================
> 
> To quit the application:
> 
> void
> destroy ( GtkWidget *widget, gpointer data )
> {
> 	gst_element_set_state(pipeline, GST_STATE_NULL);
> 	gst_object_unref(pipeline);
> 	remove_dbus_connection();
> 	gtk_main_quit();
> }
> 
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