gstreamermm option group does not init

[Marcus Brinkmann <marcus brinkmann ruhr-uni-bochum de>]

Hi,

maybe I am doing something wrong, but if gstreamermm is used with
gtkmm and with option groups instead of calling Gst::init directly,
the library does not seem to get properly initialized (while a
comparable C program works).

The attached program can be put into the source tree instead of
examples/media_player_gtkmm/main.cc.  After compiling, running the
resulting program yields:

$ ./mediaplayer
Run me with --help to see the Application options appended.

(lt-mediaplayer:4327): glibmm-WARNING **: failed to wrap type of 'GstPlayBin'

(lt-mediaplayer:4327): glibmm-WARNING **: failed to wrap type of 'GstXImageSink'
One of the elements for media player could not be created.

Thanks,
Marcus

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