Problem with Qt Multimedia

[jsulm]

@6EQUJ5 Is there something in /usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice ?

[6EQUJ5]

@jsulm The folder mediaservice in /usr/lib/x86_64-linux-gnu/qt5/plugins/ doesn't exist.

[jsulm]

@6EQUJ5 Looks like media plug-ins are missing.

[jsulm]

@6EQUJ5 Install libqt5multimedia5-plugins package

[6EQUJ5]

@jsulm I got this now:

(Media-Player:7076): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed

[jsulm]

@6EQUJ5 Can you post the output with QT_DEBUG_PLUGINS again?

[jsulm]

@6EQUJ5 Also: can you play a media file now?

[6EQUJ5]

@jsulm No I cannot. Not with QMediaPlayer. QSoundEffect works though.

Output:

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...

(Media-Player:7759): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player exited with code 0

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...

(Media-Player:7779): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player exited with code 0

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...

(Media-Player:7796): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player exited with code 0

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...

(Media-Player:7813): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player exited with code 0

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...

(Media-Player:7904): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player exited with code 0

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...

(Media-Player:7933): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player exited with code 0

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.2",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqkms.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqkms.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.2",
    "MetaData": {
        "Keys": [
            "kms"
        ]
    },
    "className": "QKmsIntegrationPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("kms")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.2",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.2",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.2",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.2",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.2",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/platforms" ...
loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
loaded library "Xcursor"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/libqgtk2.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/libqgtk2.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1",
    "MetaData": {
        "Keys": [
            "gtk2"
        ]
    },
    "className": "QGtk2ThemePlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("gtk2")
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/platformthemes" ...
loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/libqgtk2.so"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface",
    "MetaData": {
        "Keys": [
            "compose"
        ]
    },
    "className": "QComposePlatformInputContextPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("compose")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface",
    "MetaData": {
        "Keys": [
            "ibus"
        ]
    },
    "className": "QIbusPlatformInputContextPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("ibus")
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/platforminputcontexts" ...
loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/generic" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevkeyboardplugin.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevkeyboardplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QGenericPluginFactoryInterface",
    "MetaData": {
        "Keys": [
            "EvdevKeyboard"
        ]
    },
    "className": "QEvdevKeyboardPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("evdevkeyboard")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevmouseplugin.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevmouseplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QGenericPluginFactoryInterface",
    "MetaData": {
        "Keys": [
            "EvdevMouse"
        ]
    },
    "className": "QEvdevMousePlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("evdevmouse")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevtabletplugin.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevtabletplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QGenericPluginFactoryInterface",
    "MetaData": {
        "Keys": [
            "EvdevTablet"
        ]
    },
    "className": "QEvdevTabletPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("evdevtablet")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevtouchplugin.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/generic/libqevdevtouchplugin.so, metadata=
{
    "IID": "org.qt-project.Qt.QGenericPluginFactoryInterface",
    "MetaData": {
        "Keys": [
            "EvdevTouch"
        ]
    },
    "className": "QEvdevTouchScreenPlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("evdevtouch")
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/generic" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/styles" ...
loaded library "gtk-x11-2.0"
loaded library "gnomeui-2"
loaded library "gnomevfs-2"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstaudiodecoder.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstaudiodecoder.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreameraudiodecode"
        ],
        "Services": [
            "org.qt-project.qt.audiodecode"
        ]
    },
    "className": "QGstreamerAudioDecoderServicePlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("gstreameraudiodecode")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstcamerabin.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstcamerabin.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamercamerabin"
        ],
        "Services": [
            "org.qt-project.qt.camera"
        ]
    },
    "className": "CameraBinServicePlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("gstreamercamerabin")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediacapture.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediacapture.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamermediacapture"
        ],
        "Services": [
            "org.qt-project.qt.audiosource"
        ]
    },
    "className": "QGstreamerCaptureServicePlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("gstreamermediacapture")
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediaplayer.so"
Found metadata in lib /usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediaplayer.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "gstreamermediaplayer"
        ],
        "Services": [
            "org.qt-project.qt.mediaplayer"
        ]
    },
    "className": "QGstreamerPlayerServicePlugin",
    "debug": false,
    "version": 328450
}


Got keys from plugin meta data ("gstreamermediaplayer")
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/mediaservice" ...
loaded library "/usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediaplayer.so"

(Media-Player:8039): GStreamer-CRITICAL **: gst_object_ref_sink: assertion 'GST_IS_OBJECT (object)' failed
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/resourcepolicy" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/resourcepolicy" ...
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/x86_64-linux-gnu/qt5/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/accessiblebridge" ...
QLibraryPrivate::unload succeeded on "/usr/lib/x86_64-linux-gnu/qt5/plugins/mediaservice/libgstmediaplayer.so" 
QLibraryPrivate::unload succeeded on "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so" 
QLibraryPrivate::unload succeeded on "/usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/libqgtk2.so" 
QLibraryPrivate::unload succeeded on "/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so" 
QLibraryPrivate::unload succeeded on "Xcursor" (faked)
QLibraryPrivate::unload succeeded on "gnomevfs-2" (faked)
QLibraryPrivate::unload succeeded on "gtk-x11-2.0" (faked)
/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player exited with code 0

[SGaist]

What GStreamer package did you install ?

[KhoaTran Programmer]

@6EQUJ5 ,

Your log is not detail enough. You should enable Gstreamer debug, your current is just Qt.

But I guest that, your current Gstreamer plugin is not enough to playback.

One question, what kind of movie content you want to playback?(Mp4, WMV, H264, H265, MP3, ...)

Best regards,
Khoa

[6EQUJ5]

@SGaist I didn't install GStreamer. How to install? Specific instructions please the official GStreamer site doesn't help much at all for Debian.

@KhoaTran-Programmer Firstly, the commands to check if GStreamer is installed doesn't work. How to install? Specifically. The official GStreamer site doesn't help at all for Debian. Also, I would want to play MP4, MP3, AVI, WMV, etc. All those common ones. Doesn't QMediaPlayer support most common ones?

[SGaist]

Because it's not their role. Use your distribution tools to install GStreamer.

Specifically, apt-cache search to see what package are installed and apt-get install to install what you want.

In your case, libgstreamer1.0-dev as well as all the 1.0 plugins packages.

[6EQUJ5]

@SGaist I did that and the same error happens.

[SGaist]

Can you play that file with the gstreamer tools directly ?

[6EQUJ5]

@SGaist How would I do that?

[SGaist]

gst-play-1.0 your_video_file

[6EQUJ5]

@SGaist The command doesn't exist. Even though I installed libgstreamer1.0-dev.

[SGaist]

That's the development package to be able to use the library in your own projects. You need to install the GStreamer tools.

[6EQUJ5]

@SGaist What package do I need to install for the GStreamer tools?

[SGaist]

Please learn to use the tools from your distribution apt-cache search gstreamer | grep tools.

[6EQUJ5]

@SGaist I installed all the packages that came up with that command. gst-play-1.0 still doesn't work.

[SGaist]

What doesn't work ?

You can't read the file using the command ?

[6EQUJ5]

@SGaist The command still doesn't exist according to the terminal even with sudo.

[SGaist]

Seriously, did you even try to search where that file could be found ?

In this case it's the package gstreamer1.0-plugins-base-apps and the tools package is a dependency of that one.

[6EQUJ5]

@SGaist I'm sorry. I may be at least an amateur programmer, but I'm definitely not a Linux expert, so I lack knowledge. I tried googling to get gst-play-1.0 to work but came up with nothing.

Installing gstreamer1.0-plugins-base-apps allowed me to use the gst-play-1.0 command. But, when I try to play a video file (MP4) the same thing happens! I get logged out!

[SGaist]

Then you have determined that it's not a Qt problem. There's something fishy going on with your machine.

[6EQUJ5]

@SGaist It works fine in Windows 10 though. What could possibly be wrong with Debian Linux?

[SGaist]

You are comparing apple to oranges. Both are completely different OSs with completely different multimedia backends.

I don't know what is going on with your Debian but you sure have something either misconfigured or buggy. However, it's not something Qt related. You should check with the Debian folks.

[jsulm]

@6EQUJ5 I would guess bad graphics driver.
You could check the output of dmesg command. In general you should ask this question in a Debian forum or mailing list and attach information about your system (especially graphics hardware).

[6EQUJ5]

@SGaist I will do that.

@jsulm The output of sudo dmesg is here: https://pastebin.com/VY243fPh

Also, I will ask for help on Debian mailing list/forum with the output.

[SGaist]

Compare it with the output of dmesg after you got kicked of your session.

[6EQUJ5]

@SGaist New output (after getting logged out): https://pastebin.com/yJK4tFeQ

Output of diff dmesgOutputBeforeLogout.txt dmesgOutputAfterLogout.txt: https://pastebin.com/5jGtEiUd (differences between two outputs)