VOB file format
Microsoft Windows Media Player
BlazeDVD, Corel WinDVD
Video Lan VLC Player
It is known as the DVD Video Object File and is the most common format to store audio and video over the DVD. The video streaming is done in MPEG-2 format, and the audio can be stored in various formats.
These files are stored at the DVD's root, usually in the VIDEO_TS folder, and contain both video, audio, and subtitles. The AC-3 format for audio is used because it gives good support at low bit-rates, and MPEG-2 multichannel and MPEG-1 Layer 2 dual-channel or PCM format is used for the video.