BOOST_REQUIRE (content_a);
film->examine_and_add_content (content_a);
auto content_b = make_shared<DCPContent>("test/data/burnt_subtitle_test_dcp");
BOOST_REQUIRE (content_a);
film->examine_and_add_content (content_a);
auto content_b = make_shared<DCPContent>("test/data/burnt_subtitle_test_dcp");