[pygtk] gstreamer 0.10 to 1.0 and gtk2 to gtk3 errors

[Niklas Koep]

It appears I completely misunderstood the --add-init-section option of
g-ir-scanner. It's only relevant for the creation of the introspection
data. It's not a code section which gets called whenever the respective
gobject language bindings (in your case pygobject) load a typelib. So in
any case you have to call Gst.init() which you may or may not be doing
anyway.


2013/2/1 Niklas Koep <niklas.koep at gmail.com>

> I think a minimal program which reproduces the error would be helpful
> here. What exact versions of gstreamer, pygobject (python2-gobject), etc.
> are you using? In any case, calling Gst.ElementFactory.make with one
> argument from an interactive session already raises a TypeError exception
> for me as the method requires you to specify a unique name, as well as the
> element type. I guess default arguments aren't supported by pygobject yet
> which means you have to pass both 'xvimagesink' and None to the method for
> gstreamer to create a name for the element by itself.
>
> Also, do you call Gst.init() before making any other gstreamer calls? I
> was under the impression this was called upon importing the module, but for
> some reason the interpreter complains about it if you don't explicitly call
> it. Weirdly enough according to the gstreamer-1.0 source g-ir-scanner is
> called with --add-init-section="gst_init(NULL, NULL);".
>
> Regards, Niklas
>
>
>
> 2013/1/31 laguillaumie sylvain <s.lagui at free.fr>
>
>> hi list(s)
>>
>> i try to port my app to gtk3/gst1.0 but have some errors i dont
>> understand i can post my code if needed but does someone have an idear on
>> the followings errors...
>>
>> i post in pygtk and gst list but i have this crash since i used :
>>
>> self.player.videosink = Gst.ElementFactory.make('**xvimagesink')
>>
>>
>> /usr/lib/python2.7/dist-**packages/gi/types.py:47: Warning: cannot
>> register existing type `GstObject'
>>   return info.invoke(*args, **kwargs)
>> /usr/lib/python2.7/dist-**packages/gi/types.py:47: Warning:
>> g_once_init_leave: assertion `result != 0' failed
>>   return info.invoke(*args, **kwargs)
>> /usr/lib/python2.7/dist-**packages/gi/types.py:47: Warning:
>> g_type_register_static: assertion `parent_type > 0' failed
>>   return info.invoke(*args, **kwargs)
>> /usr/lib/python2.7/dist-**packages/gi/types.py:47: Warning: interface
>> type `GstImplementsInterface' or prerequisite type `<invalid>' invalid
>>   return info.invoke(*args, **kwargs)
>> /usr/lib/python2.7/dist-**packages/gi/types.py:47: Warning: cannot add
>> interface type `GstColorBalance' to type `GstPlayBin' which does not
>> conform to prerequisite `GstImplementsInterface'
>>   return info.invoke(*args, **kwargs)
>> /usr/lib/python2.7/dist-**packages/gi/types.py:47: Warning: cannot add
>> interface type `GstColorBalance' to type `GstPlaySink' which does not
>> conform to prerequisite `GstImplementsInterface'
>>   return info.invoke(*args, **kwargs)
>> /usr/lib/python2.7/dist-**packages/gi/types.py:47: Warning:
>> /build/buildd/glib2.0-2.34.1/.**/gobject/gsignal.c:2459: signal
>> `value-changed' is invalid for instance `0x9f680a8'
>>   return info.invoke(*args, **kwargs)
>> /usr/lib/python2.7/dist-**packages/gi/module.py:152: Warning: cannot
>> register existing type `GstNavigation'
>>   g_type = info.get_g_type()
>> /usr/lib/python2.7/dist-**packages/gi/module.py:156: Warning:
>> g_type_get_qdata: assertion `node != NULL' failed
>>   type_ = g_type.pytype
>> /usr/lib/python2.7/dist-**packages/gi/types.py:240: Warning: cannot
>> register existing type `GstNavigation'
>>   register_interface_info(cls.__**info__.get_g_type())
>> Traceback (most recent call last):
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 243, in mro
>>     return mro(cls)
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 257, in mro
>>     bases_of_subclasses += list(map(mro, C.__bases__)) +
>> [list(C.__bases__)]
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 257, in mro
>>     bases_of_subclasses += list(map(mro, C.__bases__)) +
>> [list(C.__bases__)]
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 257, in mro
>>     bases_of_subclasses += list(map(mro, C.__bases__)) +
>> [list(C.__bases__)]
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 257, in mro
>>     bases_of_subclasses += list(map(mro, C.__bases__)) +
>> [list(C.__bases__)]
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 257, in mro
>>     bases_of_subclasses += list(map(mro, C.__bases__)) +
>> [list(C.__bases__)]
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 257, in mro
>>     bases_of_subclasses += list(map(mro, C.__bases__)) +
>> [list(C.__bases__)]
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 262, in mro
>>     not_head = [s for s in bases_of_subclasses if candidate in s[1:]]
>>   File "/usr/lib/python2.7/dist-**packages/gi/module.py", line 269, in
>> __getattr__
>>     return getattr(self._introspection_**module, name)
>>   File "/usr/lib/python2.7/dist-**packages/gi/module.py", line 193, in
>> __getattr__
>>     wrapper = metaclass(name, bases, dict_)
>>   File "/usr/lib/python2.7/dist-**packages/gi/types.py", line 240, in
>> __init__
>>     register_interface_info(cls.__**info__.get_g_type())
>> TypeError: must be an interface
>> **
>> ERROR:/build/buildd/pygobject-**3.4.0/gi/_gobject/pygobject.c:**946:pygobject_new_full:
>> assertion failed: (tp != NULL)
>> Abandon (core dumped)
>>
>> thanks
>>
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>
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