film->examine_and_add_content (staircase);
BOOST_REQUIRE (!wait_for_jobs());
staircase->set_position (film, DCPTime::from_frames(50000, film->audio_frame_rate()));
film->examine_and_add_content (staircase);
BOOST_REQUIRE (!wait_for_jobs());
staircase->set_position (film, DCPTime::from_frames(50000, film->audio_frame_rate()));