I'm using openSUSE 12.3 and i can't start Amarok. If I try to start it from Konsole it says:

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matteo@linux-7t6g:~> amarok
(amarok:3455): GLib-GObject-WARNING **: cannot register existing type `GstObject'
(amarok:3455): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed
(amarok:3455): GLib-GObject-CRITICAL **: g_type_register_static: assertion `parent_type > 0' failed
(amarok:3455): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed
(amarok:3455): GLib-GObject-CRITICAL **: g_object_newv: assertion `G_TYPE_IS_OBJECT (object_type)' failed


Then nothing.
Version:

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matteo@linux-7t6g:~> amarok -v
Qt: 4.8.4
Piattaforma di sviluppo KDE: 4.10.1
Amarok: 2.7.0


This appears to be a problem with your gstreamer installation. Please start Amarok from the konsole with 'amarok -d --nofork' and provide the complete output you get.

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matteo@linux-7t6g:~> amarok -d --nofork
amarok: BEGIN: App::App()
amarok:   BEGIN: void App::continueInit()
amarok:     BEGIN: EngineController::EngineController()
amarok:     END__: EngineController::EngineController() [Took: 0s]
amarok:     BEGIN: void EngineController::initializePhonon()
(amarok:4282): GLib-GObject-WARNING **: cannot register existing type `GstObject'
(amarok:4282): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed
(amarok:4282): GLib-GObject-CRITICAL **: g_type_register_static: assertion `parent_type > 0' failed
(amarok:4282): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed
(amarok:4282): GLib-GObject-CRITICAL **: g_object_newv: assertion `G_TYPE_IS_OBJECT (object_type)' failed


Please check that the phonon-backend-gstreamer is installed correctly, see also the KDE Systemsettings -> Multimedia -> Phonon settings and test the sound.

Phonon was already installed, so I reinstalled it but the Phonon module in the KDE System settings doesn't load.
BUT... Clementine works fine!

But Clementine doesn't use Phonon, so you are comparing Apples with Oranges.

And I didn't ask you to isntall Phonon, but to check if the phonon-backend-gstreamer package was installed correctly, as the error message you get suggests there is a problem.

Alternatively you can use the Phonon-backend-vlc instead (not installed by default). You will have to restart KDE once the changes to the backend are made (Systemsettings -> Multimeda -> Phonon -> Backend tab)

Well, Amarok still doesn't start and the Phonon settings still doesn't load...

well, if you use the phonon-backend-vlc you should now get another output on the konsloe, could you please provide that?

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matteo@linux-7t6g:~> amarok -d --nofork
amarok: BEGIN: App::App()
amarok:   BEGIN: void App::continueInit()
amarok:     BEGIN: EngineController::EngineController()
amarok:     END__: EngineController::EngineController() [Took: 0s]
amarok:     BEGIN: void EngineController::initializePhonon()
(amarok:2708): GLib-GObject-WARNING **: cannot register existing type `GstObject'
(amarok:2708): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed
(amarok:2708): GLib-GObject-CRITICAL **: g_type_register_static: assertion `parent_type > 0' failed
(amarok:2708): GLib-CRITICAL **: g_once_init_leave: assertion `result != 0' failed
(amarok:2708): GLib-GObject-CRITICAL **: g_object_newv: assertion `G_TYPE_IS_OBJECT (object_type)' failed


Well, apparently you still use the phonon-backend-gstreamer. Did you restart KDE after the change of the backend?

Yes, i did.

Then something went really wrong, as you are still using the gstreamer backend. Could you please check again you have indeed the vlc backend on top of the list in the backends?

Could you please add the following for the output:

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amarok -d --nofork --debug-audio

And make sure you do not have both the gstreamer 1.0 and 0.10.x packages installed.

Hi.

I was suffering from this problem also.

The tip of gstreamer 1.0 and 0.10 was correct.
I removed every gstreamer 0.10 package. This of course broke alot of things , i just let it break. Immediatly afterwards, i went again into software package manager and it reinstalled what it needed for gstreamer 0.10.

It worked !

I guess there was a rogue gtreamer 0.10 package.

hum... further investigation : the rogue package was gstreamer-phonon-backend.

So as long as phonon doesnt use gstreamer ( use vlc backend ) ... all is fine.