_playlist_content_change_connection = _playlist->ContentChange.connect (bind (&Film::playlist_content_change, this, _1, _2, _3, _4));
_playlist_length_change_connection = _playlist->LengthChange.connect (bind(&Film::playlist_length_change, this));
_playlist_content_change_connection = _playlist->ContentChange.connect (bind (&Film::playlist_content_change, this, _1, _2, _3, _4));
_playlist_length_change_connection = _playlist->LengthChange.connect (bind(&Film::playlist_length_change, this));