_film_connection = film->Change.connect (boost::bind(&AudioDialog::film_change, this, _1, _2));
_film_content_connection = film->ContentChange.connect(boost::bind(&AudioDialog::content_change, this, _1, _3));
DCPOMATIC_ASSERT (film->directory());
_film_connection = film->Change.connect (boost::bind(&AudioDialog::film_change, this, _1, _2));
_film_content_connection = film->ContentChange.connect(boost::bind(&AudioDialog::content_change, this, _1, _3));
DCPOMATIC_ASSERT (film->directory());