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2 playbins in a window

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Julien GILLES

2 playbins in a window

Hi,

i am trying to play two videos in a window, using the playbin plugin.
I use an ximagesink as video-sink, and set overlay on a
GtkDrawingArea.

With a single playbin everything is fine, but if I try to create 2
playbins, strange things occurs : sometimes the application crashes,
sometime the application launches, but the two videos remains black
and there is a lot of GStreamer error on the standard output,
sometimes the two videos runs, but after 2 seconds one of them hangs.

Well, it seems to me that there is some global variables that prevents
the 2 instances to live together ; II wonder if the playbin plugin is
guilty, or if the gstreamer framework allows twoo pipelines in the
same application...

--
Julien Gilles.

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michael smith-6-3

Re: 2 playbins in a window

On Tue, May 27, 2008 at 3:11 AM, Julien GILLES <[hidden email]> wrote:

> Hi,
>
> i am trying to play two videos in a window, using the playbin plugin.
> I use an ximagesink as video-sink, and set overlay on a
> GtkDrawingArea.
>
> With a single playbin everything is fine, but if I try to create 2
> playbins, strange things occurs : sometimes the application crashes,
> sometime the application launches, but the two videos remains black
> and there is a lot of GStreamer error on the standard output,
> sometimes the two videos runs, but after 2 seconds one of them hangs.
>
> Well, it seems to me that there is some global variables that prevents
> the 2 instances to live together ; II wonder if the playbin plugin is
> guilty, or if the gstreamer framework allows twoo pipelines in the
> same application...

There should be no problem with running multiple pipelines in an
application - that's a normal use-case.

There also shouldn't be any problems specific to playbin. My guess is
that this is an application bug in your software, but I'm certainly
not sure about that.

Mike

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Wim Taymans

Re: 2 playbins in a window

In reply to this post by Julien GILLES

On Tue, 2008-05-27 at 12:11 +0200, Julien GILLES wrote:

Can you paste those errors here? Maybe it's the type registration in
glib?

Wim

>
> Well, it seems to me that there is some global variables that prevents
> the 2 instances to live together ; II wonder if the playbin plugin is
> guilty, or if the gstreamer framework allows twoo pipelines in the
> same application...
>

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Tim-Philipp Müller-2

Re: 2 playbins in a window

In reply to this post by Julien GILLES

On Tue, 2008-05-27 at 12:11 +0200, Julien GILLES wrote:

> With a single playbin everything is fine, but if I try to create 2
> playbins, strange things occurs : sometimes the application crashes,
> sometime the application launches, but the two videos remains black
> and there is a lot of GStreamer error on the standard output,
> sometimes the two videos runs, but after 2 seconds one of them hangs.
>
> Well, it seems to me that there is some global variables that prevents
> the 2 instances to live together ; II wonder if the playbin plugin is
> guilty, or if the gstreamer framework allows twoo pipelines in the
> same application...

There have been some issues with starting up two pipelines/playbins at
the same time. These should mostly be fixed in CVS (core and plugin
modules) (see e.g. http://bugzilla.gnome.org/show_bug.cgi?id=530317).

What versions are you trying with? What errors/warnings are you seeing?

Cheers
-Tim

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Julien GILLES

Re: 2 playbins in a window

2008/5/27 Tim Müller <[hidden email]>:

> There have been some issues with starting up two pipelines/playbins at
> the same time. These should mostly be fixed in CVS (core and plugin
> modules) (see e.g. http://bugzilla.gnome.org/show_bug.cgi?id=530317).
>
> What versions are you trying with? What errors/warnings are you seeing?

GStreamer 0.10.18.

I have run the applications 3 times, 3 differents behaviours (the
code is below).

1) The main window appears, and crashes immediatly. Std output is :

GLib-GObject-ERROR **: g_type_plugin_*() invalidly modified type
`GstStreamSelector'
aborting...
Abandon

Another test crashes with :

GLib-GObject-ERROR **: g_type_plugin_*() invalidly modified type `GstStreamInfo'
aborting...
Abandon

2) The window appears, with the 2 videos, but one stops playing after
a few seconds. No errors on standard output.

3) same as 2), but with a lot of errors :

(player:12602): GLib-GObject-WARNING **: cannot register existing type
`GstJackAudioSinkRingBuffer'

(player:12602): GLib-GObject-CRITICAL **: g_object_new: assertion
`G_TYPE_IS_OBJECT (object_type)' failed

** (player:12602): CRITICAL **: gst_ring_buffer_open_device: assertion
`GST_IS_RING_BUFFER (buf)' failed

(player:12602): GLib-GObject-WARNING **: cannot register existing type
`GstJackAudioSinkRingBuffer'

(player:12602): GLib-GObject-CRITICAL **: g_object_new: assertion
`G_TYPE_IS_OBJECT (object_type)' failed

** (player:12602): CRITICAL **: gst_ring_buffer_open_device: assertion
`GST_IS_RING_BUFFER (buf)' failed

Here is the code :

#include <config.h>
#include <X11/Xlib.h>
#include <gst/gst.h>
#include <gst/interfaces/xoverlay.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>

static void
on_destroy (GtkWidget * widget, gpointer data)
{
gtk_main_quit ();
}

static gboolean expose_cb(GtkWidget * widget, GdkEventExpose * event,
gpointer data)
{
gst_x_overlay_set_xwindow_id(GST_X_OVERLAY(data),
GDK_WINDOW_XWINDOW(widget->window));
gtk_widget_show_all(widget);
}

GstElement*
add_video(GtkFixed* fixed, gint x, gint y, gint w, gint h)
{
const char* uri = "file:///tmp/foo.avi";

GstElement* playbin = gst_element_factory_make ("playbin", "play");
GstElement* vsink = gst_element_factory_make ("ximagesink", "vsink");
g_object_set (G_OBJECT (playbin), "video-sink", vsink, NULL);
g_object_set (G_OBJECT (playbin), "uri", uri, NULL);

GtkWidget* da = gtk_drawing_area_new();
gtk_widget_set_size_request(da, w, h);
gtk_fixed_put(GTK_FIXED(fixed), da, x, y);
g_signal_connect(da, "expose-event", G_CALLBACK(expose_cb), vsink);
gst_element_set_state(playbin, GST_STATE_PLAYING);
return playbin;
}

static gboolean
bus_call (GstBus *bus,
GstMessage *msg,
gpointer data)
{
GMainLoop *loop = (GMainLoop *) data;

switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_EOS:
g_print ("End-of-stream\n");
g_main_loop_quit (loop);
break;
case GST_MESSAGE_ERROR: {
gchar *debug;
GError *err;

gst_message_parse_error (msg, &err, &debug);
g_free (debug);

g_print ("Error: %s\n", err->message);
g_error_free (err);

g_main_loop_quit (loop);
break;
}
default:
break;
}

return TRUE;
}

int
main (int argc, char *argv[])
{
GtkWidget *window;

gtk_init (&argc, &argv);

window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size (GTK_WINDOW (window), 1024, 768);
g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK
(on_destroy), NULL);

GtkWidget* fixed = gtk_fixed_new();
gtk_container_add(GTK_CONTAINER(window), fixed);
gtk_widget_show (fixed);

const gchar *nano_str;
guint major, minor, micro, nano;

gst_init (&argc, &argv);

gst_version (&major, &minor, &micro, &nano);

if (nano == 1)
nano_str = "(CVS)";
else if (nano == 2)
nano_str = "(Prerelease)";
else
nano_str = "";

printf ("This program is linked against GStreamer %d.%d.%d %s\n",
major, minor, micro, nano_str);

GstElement *v1 = add_video(GTK_FIXED(fixed), 0, 0, 300, 300);
GstElement *v2 = add_video(GTK_FIXED(fixed), 301, 301, 300, 300);
gst_element_set_state(v1, GST_STATE_PLAYING);
gst_element_set_state(v2, GST_STATE_PLAYING);

gtk_widget_show_all (window);
gtk_main ();

return 0;
}

--
Julien Gilles.
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