(2). Vob file is used to save all the MPEG-2 format for audio and video data, which includes not only the film itself, but also for the menus and buttons with pictures and a variety of sub-screen subtitles streams. . ifo file is used to control the playback of VOB files, in this file can be found in how to control. vob files in the data broadcast information. As the. Ifo file on the disc can be played normally essential, so all of the. Ifo files are saved with a copy of the same name. Bup files. In each DVD disc has a video manager (VMG), it is stored in VIDEO_TS.ifo file, save a CD-ROM of the global information, such as CD-ROM in which the region shows. At the same time, CD-ROM will also be used to display menu data stored in VIDEO_TS.vob file, when inserted into the drive when a CD player will first display this menu, most of the menu to specify the scene the audience, choose the language subtitling.