Problem with Qt Multimedia

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.