film->set_interop (false);
shared_ptr<FFmpegContent> c (new FFmpegContent("test/data/red_24.mp4"));
film->examine_and_add_content (c);
film->set_interop (false);
shared_ptr<FFmpegContent> c (new FFmpegContent("test/data/red_24.mp4"));
film->examine_and_add_content (c);