extern void set_backtrace_file (boost::filesystem::path);
extern dcp::FrameInfo read_frame_info (FILE* file, int frame, Eyes eyes);
extern void write_frame_info (FILE* file, int frame, Eyes eyes, dcp::FrameInfo info);
extern void set_backtrace_file (boost::filesystem::path);
extern dcp::FrameInfo read_frame_info (FILE* file, int frame, Eyes eyes);
extern void write_frame_info (FILE* file, int frame, Eyes eyes, dcp::FrameInfo info);