can't control valve drop property

[jomifo]

I am mixing a video stream with a static image.  That's working fine.  I
would like to dynamically turn the image off/on at certain times.  My idea
was to put a valve after the image stream and use a controller to toggle the
drop property.  But alas, I get an error when trying to create that
controller,

In [45]: gst.Controller( gst.element_factory_make( 'valve' ), 'drop' )

** (ipython:2530): CRITICAL **: gst_controlled_property_new: assertion
`(pspec->flags & (G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE |
G_PARAM_CONSTRUCT_ONLY)) == (G_PARAM_WRITABLE | GST_PARAM_CONTROLLABLE)'
failed
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)

/mnt/transfer/<ipython console> in <module>()

RuntimeError: could not create GstController object

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