[gst-devel] pixbuf from video file

Luis de Bethencourt bethencourt at gmail.com
Tue Sep 18 21:49:04 CEST 2007


After 5 days running in circles with this problem, and trying a few
different approaches suggested in the irc channel. I don't get this to
work at all, I'm getting terribly frustrated and desperate. I really
need this thumbnailer for my project.

This is my code:


	pipeline = gst_pipeline_new ("pipeline");
	play = gst_bin_new ("my_bin");

	src = gst_element_factory_make ("filesrc", "source");
	g_object_set (G_OBJECT (src), "location", file_src, NULL);

	parser = gst_element_factory_make ("decodebin", "mpeg-parser");
	decoder = gst_element_factory_make ("ffmpegcolorspace", "mpeg-decoder");
	videoscale = gst_element_factory_make ("videoscale", "videoscale");
	g_object_set (G_OBJECT (videoscale),
		"video/x-raw-rgb,width=640,height=480,bpp=24,depth=24", NULL);
	fakesink = gst_element_factory_make ("fakesink", NULL);

	if (!pipeline || !src || !parser || !decoder || !videoscale || !fakesink) {
		g_print ("One element could not be created\n");

	bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
	gst_bus_add_watch (bus, bus_call, loop);
	gst_object_unref (bus);

	gst_bin_add_many (GST_BIN (play),
		src, parser, decoder, videoscale, fakesink, NULL);
	gst_bin_add (GST_BIN (pipeline), play);

	gst_element_link (source, parser);
	gst_element_link_many (decoder, videoscale, fakesink, NULL);
	g_signal_connect (parser, "pad-added", G_CALLBACK (new_pad), NULL);

	//gst_element_set_state (pipeline, GST_STATE_PAUSED);
	gst_element_get_state (pipeline, NULL, NULL, -1);
	gst_element_seek_simple(pipeline, GST_FORMAT_PERCENT,

	g_object_get (play, "frame", &buffer, NULL);

	pixbuf = gdk_pixbuf_new_from_data (GST_BUFFER_DATA (buffer),
		GST_ROUND_UP_4 (120 * 3), NULL, buffer);


And this are the problems I'm getting:
object class `GstBin' has no property named `frame'
object class `GstVideoScale' has no property named
assertion `GST_IS_ELEMENT (src)' failed
and then probably the buffer format will be wrong.

I will deeply thank any help,
Luis de Bethencourt

On 8/6/07, David Schleef <ds at schleef.org> wrote:
> On Thu, Aug 02, 2007 at 01:15:30PM +0200, Fredrik Persson wrote:
> > To make it absolutely clear; I think that the gstreamer developers are doing
> > a great job!
> >
> > I also absolutely think that they also appreciate "user input" (in this
> > case, mine and Luis') on what features we'd like to see in gstreamer.
> > Therefore, I like to take the opportunity to bring up this suggestion again.
> > I think that every time this question is brought up here on the mailinglist
> > is strengthens the point that a "snapshot element" in gstreamer is a good
> > idea and that it would increase the attractiveness of the entire gstreamer
> > framework.
> It's also a FAQ that can be answered with a simple mailing list search:
>   http://search.gmane.org/?query=thumbnails&group=gmane.comp.video.gstreamer.devel
> dave...

Luis de Bethencourt Guimerá
<bethencourt at gmail.com>
GPG: B0ED1326

More information about the gstreamer-devel mailing list