Hi, I use "mplayer dvd://N -ao null -vo null -frames 0 -v" to check info about title N (e.g. how many chapters belong to title N, how many audio tracks in title N,etc). But I can not know how long title N is (e.g. 00:45:08). I've also checked the source code, tt_srpt_t has info about total dvd (e.g. how many titles in a dvd?) and title_info_t is for title info, but I can not find the title time length info in title_info_t, how to calculate it? Thank you very much! -------------------ifo_types.h----- typedef struct { uint16_t nr_of_srpts; uint16_t zero_1; uint32_t last_byte; title_info_t *title; } ATTRIBUTE_PACKED tt_srpt_t; typedef struct { playback_type_t pb_ty; uint8_t nr_of_angles; uint16_t nr_of_ptts; uint16_t parental_id; uint8_t title_set_nr; uint8_t vts_ttn; uint32_t title_set_sector; } ATTRIBUTE_PACKED title_info_t; --------------------------------------- Best Regards, Xie Bo