"GStreamer-CRITICAL" after loading qmediaplayer's libs and plugins

[IL]

Hi
I am trying to display video on my Linux embedded ARM system (Beaglebone like) using qmediaplayer.
After loading all libraries include gstreamer and qt plugins, I get the below logs

(APP:82): GLib-GObject-CRITICAL **: g_object_set assertion G_IS_OBJECT (object) failed
(APP:82): GStreamer-CRITICAL **: gst_object_ref assertion object != NULL failed
(APP:82): GStreamer-CRITICAL **: gst_bin_add_many: assertion 'GST_IS_ELEMENT (element_1)' failed
(APP:82): GStreamer-CRITICAL **: gst_element_link_pads_full: assertion 'GST_IS_ELEMENT (src)' failed
(APP:82): GStreamer-CRITICAL **: gst_bus_get_static_pad: assertion 'GST_IS_ELEMENT (element)' failed
(APP:82): GStreamer-CRITICAL **: gst_ghost_pad_new: assertion 'GST_IS_PAD (target)' failed
(APP:82): GStreamer-CRITICAL **: gst_element_add_pad: assertion 'GST_IS_PAD (pad)' failed
(APP:82): GStreamer-CRITICAL **: gst_object_unref: assertion 'object != NULL' failed

Can anyone help me with it?
Best regards,
IL

[SGaist]

Hi,

Did you installed gstreamer's plugins ?

[IL]

@SGaist Hi,
I think so, what I do is copy libs into my target.
currently I have copied:

• libgstbase-1.0.so
• libgsttag-1.0.so
• libgstaudio-1.0.so
• libgstvideo-1.0.so
• libgstreamer-1.0.so
• libgstapp-1.0.so
• libgstpbutils-1.0.so
  Did I miss anything?

IL

[SGaist]

Looks like the libs not the plugins. Search for something like gstreamer1.0-plugins-*

[IL]

@SGaist Hi,
I have copied into my target all gst-plugins* .so files as you mention above but nothing change.
Anything else that I can check?

IL

[SGaist]

It's going to be a silly question but, are these plugins of the right architecture ?

[IL]

@SGaist Hi,
If you asking about gst-plugins compilation, so all of the compilation done with my toolchain of-course.
Is there spacific location for them or /usr/lib is good enough?

My target working with Linux FB, is that an issue? Because I have another log that show "No m_videoSink available"
When i have searched for that log i saw the code below in
qtmultimedia/src/gsttols/qgstreamervideowindow.cpp and it concern me

if (elementName) {
m_videoSink = gst_element_factory_make(elementName, NULL);
} else if (QGuiApplication::platformName().compare(QLatin1String("xcb"), Qt::CaseInsensitive) == 0) {
// We need a native X window handle to be able to use xvimagesink.
// Bail out if Qt is not using xcb (the control will then be ignored by the plugin)
m_videoSink = gst_element_factory_make("xvimagesink", NULL);
}

if (m_videoSink) {
...
}
else
qDebug() << "No m_videoSink available!";
Dose QtMultimedia gstreamer-1.0 support has been written for xcb and No eglfs, linuxfb, directfb, etc is available?

Best regards,
IL

[jsulm]

What SGaist asked is: did you compile the plugins for ARM architecture?
Is your toolchain for cross-compilation for ARM?

[IL]

@jsulm Hi,
Sure, all are cross-compiled for my ARM target using my toolchain as I mention in the first line.

[SGaist]

I don't know exactly where your custom gstreamer expects its plugins but you have some information about that here

[IL]

Thanks SGaist ,
What about my question above...
Dose QtMultimedia gstreamer-1.0 support has been written for xcb and No eglfs, linuxfb, directfb, etc is available?
Can someone give information about that?

IL

[SGaist]

AFAIK it't not dependent on the QPA plugin

[IL]

Found the missing plugins
Playing AVI required:

• typedefinefunction lib
• inter lib
• autodetect lib
• libav codecs
• avi

And of-course I have new isuue :-(
Failed to start video surface due to main thread blocked
Thanks For the help, I probably start a new thread.
IL

[IL]

How do I change the post to "SOLVED"?

[SGaist]

Glad you could go further !

You can use the "Topic Tool" button for that :)

[IL]

@SGaist Thanks!

[Ryan Lee]

@IL How could i find the missing plugins?

[jsulm]

@Ryan-Lee Set QT_DEBUG_PLUGINS variable before starting your app and analysehttps://doc.qt.io/qt-5.10/debug.html its output.
See https://doc.qt.io/qt-5.10/debug.html