Problem with Qt Multimedia

[jsulm]

@6EQUJ5 From Debian? Use apt-get to install it as any other packages.
What you downloaded is not what Debian provides.

[6EQUJ5]

@jsulm What packages do I install? Do I have to install them all separately like qtcreator, qtbase5-dev, etc. or is there a way to install it with one package? If not what are all the packages needed?

[jsulm]

@6EQUJ5 I don't have Debian here. But you should be able to find out what is needed. No need to install QtCreator from Debian as you already have it. On Ubuntu you can install qt5-default, don't know whether it is same on Debian.

[6EQUJ5]

@jsulm I uninstalled Qt with the maintenance tool. Then installed with sudo aptitude install qt5-default and qtcreator with sudo aptitude install qtcreator .

But, now I get this error Project ERROR: Unknown module(s) in QT: multimedia. In the .pro file I have QT += multimedia. I used the same code to test as way above.

[jsulm]

@6EQUJ5 Then install libqt5multimedia5

[6EQUJ5]

@jsulm After running sudo aptitude install libqtmultimedia5 the same problem happens.

[jsulm]

@6EQUJ5 qtmultimedia5-dev

[6EQUJ5]

@jsulm I can now compile successfully and run it. But, in the application output I get this:

defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

[jsulm]

@6EQUJ5 Can you set QT_DEBUG_PLUGINS environment variable to 1 and then start your app? Post then the output.

[6EQUJ5]

@jsulm How do get to the place where I can do that?

[jsulm]

@6EQUJ5 You can do it in QtCreator: "Projects/Run Settings" in "Run Environment" add that variable.

[6EQUJ5]

@jsulm Output:

Starting /home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/Media-Player...
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"
/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() checking directory path "/home/user/Documents/Qt Projects/Media-Player/build-Media-Player-Desktop-Release/mediaservice" ...
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"
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/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

[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.