<div dir="ltr">Hi,<br><br>I'm new to gstreamer, so maybe I'm doing something totally wrong here. <br>I have an SDL application (using SDL for window, rendering and event handling), and I have a thread which uses gstreamer to play a video stream. In that thread I initialise the pipeline, create the main loop and run it. The video is playing fine on my SDL created window. <br>
The problem starts when I get libnotify involved. I use libnotify to post some kinds of notifications from the application. The notifications are posted from a different thread (not the video player thread), and also use glib and <font><font size="2">libdbus</font></font>. As soon as a notification is shown, the video thread exits (or sometime crashes). <br>
<br>
<div class="info">
</div> Probably there's some collision between libnotify & gstreamer. They do have the same context, but the libnotify thread doesn't run his own main loop.
Here's the trace for the relevant threads:
<p>The exiting thread, which run the video main loop:</p>
<hr>
<h1 style="font-family: times new roman,serif;"><font size="2">0 0xb6bcac34 in _exit () from /lib/tls/i686/cmov/libc.so.6</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">1 0xb691504d in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">2 0xb68f5e73 in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">3 0xb68f827b in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">4 0xb68f82fd in dbus_connection_send () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">5 0xb68f162c in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">6 0xb68f16a9 in dbus_bus_remove_match () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">7 0xb692f5db in ?? () from /usr/lib/libdbus-glib-1.so.2</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">8 0xb69311f9 in ?? () from /usr/lib/libdbus-glib-1.so.2</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">9 0xb6fd329f in g_object_run_dispose () from /usr/lib/libgobject-2.0.so.0</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">10 0xb693157b in ?? () from /usr/lib/libdbus-glib-1.so.2</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">11 0xb68f70d5 in dbus_connection_dispatch () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">12 0xb69286bd in ?? () from /usr/lib/libdbus-glib-1.so.2</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">13 0xb6f41b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">14 0xb6f450eb in ?? () from /usr/lib/libglib-2.0.so.0</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">15 0xb6f455ba in g_main_loop_run () from /usr/lib/libglib-2.0.so.0</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">16 0x0805135b in vp_thread_func (userdata=0x81b3948) at video_player/video_player.c:874</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">17 0xb6c944ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">18 0xb6c0f5ee in clone () from /lib/tls/i686/cmov/libc.so.6</font></h1>
<hr style="font-family: times new roman,serif;">
<p style="font-family: times new roman,serif;"><font size="2">The frame thread, which calls notify_notification_show:</font></p>
<hr style="font-family: times new roman,serif;">
<h1 style="font-family: times new roman,serif;"><font size="2">0 0xb690e6b6 in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">1 0xb690e09a in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">2 0xb690e111 in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">3 0xb690bd39 in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">4 0xb690c92e in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">5 0xb68f6bf8 in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">6 0xb68f8d98 in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">7 0xb68f8ef2 in ?? () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">8 0xb69061f1 in dbus_pending_call_block () from /lib/libdbus-1.so.3</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">9 0xb692e1cf in ?? () from /usr/lib/libdbus-glib-1.so.2</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">10 0xb692ec0e in dbus_g_proxy_call () from /usr/lib/libdbus-glib-1.so.2</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">11 0xb77cdb98 in notify_notification_show () from /usr/lib/libnotify.so.1</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">12 0x0804b91d in post_tray_notification (msg=0xb5409008 "Test!") at unix_utils.c:277</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">13 0x0804c3a7 in handle_event_msg (msg=0xb46132b4, len=6) at scremote_client.c:504</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">14 0x0804ca5e in handle_msg (sock=7) at scremote_client.c:639</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">15 0x0804cb1f in wait_for_msg (sock=7) at scremote_client.c:657</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">16 0x0804dfb5 in frame_thread_func (dummy=0x0) at scremote_client.c:1466</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">17 0xb6c944ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0</font></h1>
<h1 style="font-family: times new roman,serif;"><font size="2">18 0xb6c0f5ee in clone () from /lib/tls/i686/cmov/libc.so.6</font></h1>Here's the code of the video initialisation:<br><br>******<br><br>static void* vp_thread_func(void* userdata)<br>
{<br><br> vp_t* vp = (vp_t*)userdata;<br><br> vp->thread_state = VP_THREAD_INITIALIZING;<br><br> if(vp_init(vp)) {<br> vp->thread_state = VP_THREAD_INITIALIZED;<br><br> vp->loop = g_main_loop_new (NULL , FALSE);<br>
<br> // Call our timer function every 500ms - this will be used to hide the cursor<br> // when there is no input.<br> g_timeout_add_full(G_PRIORITY_LOW, 500, &vp_timer, (gpointer)vp, NULL);<br><br>
syslog(LOG_INFO, "Video player subsystem running.\n");<br><br> g_main_loop_run(vp->loop);<br><br> vp_remove(vp);<br><br> vp->thread_state = VP_THREAD_UNINITIALIZED;<br><br> if(vp->remove_request) {<br>
g_free(vp);<br> // Don't use vp beyond this point.<br> }<br> } else {<br> syslog(LOG_ERR, "Failed to initialize the video player subsystem.\n");<br> vp->thread_state = VP_THREAD_INIT_ERROR;<br>
}<br><br> return NULL;<br>}<br><br>*****<br><br>Does anyone have an idea what causes the collision? Any suggestions? <br><br>Thanks,<br>Stas.<br><br><br></div>