From the mplayer DVD FAQ: Q: Playing a DVD, I encountered this error : mplayer: ifo_read.c:1143: ifoRead_C_ADT_internal: Assertion nfo_length / sizeof(cell_adr_t) >= c_adt->nr_of_vobs' failed. A: This is a known libdvdread 0.9.1 bug, it should be already fixed in 0.9.2. I'm using libdvdread 0.9.2 and I still getting this error, some suggestion?