extern boost::shared_ptr<Film> new_test_film (std::string);
extern boost::shared_ptr<Film> new_test_film2 (std::string);
extern void check_dcp (boost::filesystem::path, boost::filesystem::path);
extern boost::shared_ptr<Film> new_test_film (std::string);
extern boost::shared_ptr<Film> new_test_film2 (std::string);
extern void check_dcp (boost::filesystem::path, boost::filesystem::path);
extern void check_mxf_audio_file (boost::filesystem::path ref, boost::filesystem::path check);
extern void check_xml (boost::filesystem::path, boost::filesystem::path, std::list<std::string>);
extern void check_file (boost::filesystem::path, boost::filesystem::path);
extern void check_mxf_audio_file (boost::filesystem::path ref, boost::filesystem::path check);
extern void check_xml (boost::filesystem::path, boost::filesystem::path, std::list<std::string>);
extern void check_file (boost::filesystem::path, boost::filesystem::path);
-extern void check_ffmpeg (boost::filesystem::path, boost::filesystem::path);
-extern void check_image (boost::filesystem::path, boost::filesystem::path);
+extern void check_ffmpeg (boost::filesystem::path, boost::filesystem::path, int audio_tolerance);
+extern void check_image (boost::filesystem::path, boost::filesystem::path, double threshold = 0.01);
extern boost::filesystem::path test_film_dir (std::string);
extern void write_image (boost::shared_ptr<const Image> image, boost::filesystem::path file, std::string format);
boost::filesystem::path dcp_file (boost::shared_ptr<const Film> film, std::string prefix);
void check_one_frame (boost::filesystem::path dcp, int64_t index, boost::filesystem::path ref);
extern boost::filesystem::path test_film_dir (std::string);
extern void write_image (boost::shared_ptr<const Image> image, boost::filesystem::path file, std::string format);
boost::filesystem::path dcp_file (boost::shared_ptr<const Film> film, std::string prefix);
void check_one_frame (boost::filesystem::path dcp, int64_t index, boost::filesystem::path ref);