_decoders = decoder_factory (_film, o, 0);
_decoders.video->Video.connect (bind (&FilmViewer::process_video, this, _1, _2, _3));
_decoders.video->OutputChanged.connect (boost::bind (&FilmViewer::decoder_changed, this));
_decoders = decoder_factory (_film, o, 0);
_decoders.video->Video.connect (bind (&FilmViewer::process_video, this, _1, _2, _3));
_decoders.video->OutputChanged.connect (boost::bind (&FilmViewer::decoder_changed, this));