[gst-devel] Xoverlay artifacts

[Paulo Schreiner]

Solved it already :-) Sorry to bother...

changed the sink to xvimagesink and configured Xv and it worked...

Thanks,
Paulo Schreiner

On Wed, 2009-11-18 at 12:27 -0200, Paulo Schreiner wrote:
> Hello,
> 
> I'm developing a video player, to be embedded on a low cost PC. It
> should play a sequence of short video clips, repeating when getting to
> the end, but it should also be possible to include a video to be played
> one time, at an arbitrary moment. But, one very important feature is
> that the player looks "professional", that is, to the viewer it should
> look like normal TV.
> 
> To that effect I leveraged the Gstreamer framework and developed a
> sample application. It works ok, but i notice an artifact while playing
> full-screen or any kind of scaled video. For a short time, a fraction of
> a second, when the program starts playing a new clip, it appears on
> screen with its original resolution, shortly thereafter it fills the
> window allocated to it.
> 
> I'm using Xoverlay as described in the documentation, is it possible
> that the xvvideosink is creating it's own window, and only a
> split-second later doing the overlay? If I resize the window DURING
> play, it works seamlessly.
> 
> The relevant code is:
> 
>     pipeline = gst_pipeline_new ("gst-player");
> 
>     bin = gst_element_factory_make ("playbin", "bin");
>     videosink = gst_element_factory_make ("xvvideosink", "videosink");
> 
>     g_object_set (G_OBJECT (bin), "video-sink", videosink, NULL);
> 
>     gst_bin_add (GST_BIN (pipeline), bin);
> 
>     {
>         GstBus *bus;
>         bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
>         gst_bus_add_watch (bus, bus_cb, NULL);
> 	gst_bus_set_sync_handler (bus, (GstBusSyncHandler) create_window,
> pipeline);
>         gst_object_unref (bus);
>     }
> 
>     g_object_set (G_OBJECT (bin), "uri", uri, NULL);
> g_print("URI2: %s\n", uri);
> 
> 
>     gst_element_set_state (pipeline, GST_STATE_PLAYING);
> ---------------------------------------------------------------------
> 
> This is executed when playing the first video.
> 
> -----------------------------------------------------------------------
> static GstBusSyncReply
> create_window (GstBus * bus, GstMessage * message, GstPipeline *
> pipeline)
> {
>  // ignore anything but 'prepare-xwindow-id' element messages
>  if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
>    return GST_BUS_PASS;
>  
>  if (!gst_structure_has_name (message->structure, "prepare-xwindow-id"))
>    return GST_BUS_PASS;
>  
>  gst_x_overlay_set_xwindow_id (GST_X_OVERLAY (GST_MESSAGE_SRC
> (message)),
>      window); // window is a global
>   
>  gst_message_unref (message);
>   
>  return GST_BUS_DROP;
> }
> -------------------------------------------------------------------------
> To play the next clip, i do as follows:
> -------------------------------------------------------------------------
>     	gst_element_set_state (pipeline, GST_STATE_READY);
>     	g_object_set (G_OBJECT (bin), "uri",
> current_play_list->uri_to_play, NULL);
> 	gst_element_set_state (pipeline, GST_STATE_PLAYING);
> -------------------------------------------------------------------------
> 
> 
> 
> Full source with a makefile is available too:
> http://www.jorjao81.com/player.tar.bz2
> 
> Could anyone help me? I really want to use gstreamer for this project,
> and I'm probably doing something stupid... But i have to get rid of the
> artifacts...
> 
> Sorry for this lengthy message, and thanks in advance.
> 
> Yours, 
> Paulo Schreiner
> 
>