Allow me to demonstrate this with code:

In [1]: from gi.repository import Gst

In [2]: Gst.init()
Out[2]: []

In [3]: Gst.Caps
Out[3]: gi.overrides.Gst.Caps

In [4]: Gst.Caps()
Out[4]: <GstCaps at 0x2b0ab70>

In [5]: Gst.Caps("hi")
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-5-d1c75c0c988e> in <module>()
----> 1 Gst.Caps("hi")

TypeError: function takes at most 0 arguments (1 given)

In [6]: Gst.Caps.__new__(None, "hi")
Out[6]: <GstCaps at 0x2b0ade0>


This is the offending commit https://git.gnome.org/browse/pygobject/commit/?id=3a2bfc8bf01fcae386355bc3652780e198e54d49

From IRC (#pitivi):
<lazka> you have to add __init__(self, *args, **kwargs): super(..).__init__()
<lazka> I didn't think  of other overrides (neither did simon it seems).. sorry :/


This issue prevents pitivi from being used in Fedora Rawhide.