(Video OBbjects) A DVD movie file that contains MPEG video and AC-3 or other audio data. Audio streams for multiple languages are multiplexed together. VOB files have specific file names that start with VTS (Video Title Set) and contain title and section; for example: VTS_01_2.VOB means Title 1, Section 2. VIDEO_TS.VOB is the start of the content and typically contains menus and trailers. The IFO files contain the content's attributes and options (aspect ratio, subtitles, languages, etc.), and BUP files are backup IFO files.