"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