VOB, DVD Video Object File (.vob)
The VOB Video file format
Commonly referred to as the DVD Video Object file, VOB is one of the mot frequent formats for storing video and audio streams on DVD discs. A VOB file can contain video, audio, subtitles, DVD menus and navigation content multiplexed together into a stream form. It contains video streaming in MPEG-2 format and audio streaming in one of several formats.
Technical details of VOB files
VOB files consist of video, audio and subtitle streams, and are usually stored in the VIDEO_TS folder at the root of a DVD. The video stream in a VOB file is in MPEG-2 format, the audio on the other hand can be stored in many different formats like AC-3, MPEG-2 multichannel, MPEG-1 Layer 2 dual channel, or PCM format. The AC-3 format is the most commonly used because it offers a good compromise between quality and low bitrate.