extern char *mlt_property_get_time( mlt_property self, mlt_time_format, double fps, locale_t );
extern int mlt_property_interpolate(mlt_property self, mlt_property previous, mlt_property next,
double position, int length, double fps, locale_t locale );
+extern double mlt_property_get_double_pos(mlt_property self, double fps, locale_t locale, int position, int length );
+extern int mlt_property_get_int_pos(mlt_property self, double fps, locale_t locale, int position, int length );
#endif