DCPTime const p = (*previous)->position ();
(*previous)->set_position (p + c->length_after_trim ());
c->set_position (p);
sort (_content.begin(), _content.end(), ContentSorter ());
DCPTime const p = (*previous)->position ();
(*previous)->set_position (p + c->length_after_trim ());
c->set_position (p);
sort (_content.begin(), _content.end(), ContentSorter ());