shared_ptr<dcp::MonoPictureAsset> ref (new dcp::MonoPictureAsset (ref_mxf));
boost::filesystem::directory_iterator i ("build/test/video_mxf_content_test/video");
shared_ptr<dcp::MonoPictureAsset> ref (new dcp::MonoPictureAsset (ref_mxf));
boost::filesystem::directory_iterator i ("build/test/video_mxf_content_test/video");