A user came in irc #mplayer complaining that dvdnav crashes with a number of programs (VLC included). He did manage to provide a detailed backtrace. Here is a part of it: -- *** libdvdread: CHECK_VALUE failed in ifo_read.c:914 *** *** for pgc->program_map_offset != 0 *** *** libdvdread: CHECK_VALUE failed in ifo_read.c:916 *** *** for pgc->cell_position_offset != 0 *** [...] dvdnav_describe_title_chapters (this=0x7fffd0006e00, title=<optimized out>, times= 0x7fffd7b0f018, duration=0x7fffd7b0f010) at searching.c:625 625 cellnr = pgc->program_map[ptt[i].pgn-1]; -- Thanks to that report I made quick workaround that seems to avoid the crash. Patch attached to the mail. I have asked the user to compare the .IFO and . BUP files in case the .IFO is intentionally broken as some DRM scheme, but they seem to have the same checksums. The user also provided the .BUP file and I can forward it off-list, in case somebody wants to investigate. The source seems to be original disk of "the dictator". Best Regards Ivan Kalvachev iive