VOB
Filename extension |
.vob, .ifo, .bup |
---|---|
Internet media type |
video/dvd, video/mpeg, subtitles |
Contained by | DVD-Video |
Extended from | MPEG program stream (ISO/IEC 13818-1) |
Standard | DVD-Video Book[3][4] |
Open format? | No |
Free format? | No |
VOB (for video object) is the
File format
Files in VOB format have a .vob
filename extension and are typically stored in the
Analogous to the MPEG program stream, a VOB file can contain
On the DVD, all of the content for one title set is contiguous, but if necessary is broken up into 1 GB VOB files in order to be compatible with all operating systems, as some cannot read files larger than that size.[6][11]
Companion files
VOB files may be accompanied with IFO and BUP files. These files respectively have .ifo
and .bup
filename extensions.
IFO (information) files contain all the information a DVD player needs to know about a DVD so that the user can navigate and play all DVD content properly,[12] such as where a chapter starts, where a certain audio or subtitle stream is located, information about menu functions and navigation. BUP (backup) files are exact redundant copies of IFO files, supplied to help in case of corruption. Video players may not allow DVD navigation when IFO or BUP files are absent.
Copy protection
Almost all commercially produced DVD-Video titles use some
Many DVD-Video titles are
Playback
A player of generic MPEG-2 files can usually play unencrypted VOB files, which contain MPEG-1 Audio Layer II audio. Other audio compression formats such as AC-3 or DTS are less widely supported.[citation needed]
Other DVD containers
Some
See also
References
- ^ "VOB File Format". WhatIs.com. TechTarget. Retrieved 18 April 2012.
- ^ ".VOB File". FileExt. UniBlue. Retrieved 18 April 2012.
- ^ DVD FLLC (2009-02) DVD Book Construction - list of all available DVD Books, Retrieved on 2009-07-24
- ^ DVD FLLC DVD Format Book - History of Supplements for DVD Books, Retrieved on 2009-07-24
- ^ ".VOB File Extension". FileInfo.com. Retrieved 18 April 2012.
- ^ a b c "What is a VOB file". MPUCoder. SoundWare Associates. Retrieved 18 April 2012.
- ^ a b "DVD - MPeg (sic.) differences". DVD Resources for Open Source Development. SourceForge. Retrieved 28 April 2012.
- ^ "Is it easy to understand DVD format?". Archived from the original on 2001-10-24. Retrieved 2011-02-26.
- ^ MPEG.org (July 21, 1996) DVD Technical Notes - Video Data Specifications, Retrieved on 2009-07-25
- ^ Videohelp.com What is DVD? Technical Info for DVD-Video, Retrieved on 2009-07-28
- ^ Doom9.org doom9.org What's on a DVD?, Retrieved on 2009-07-26
- ^ AfterDawn.com (2007-07-31) How to play VOB / IFO / BUP files, Retrieved on 2009-07-26
- ^ DVD Demystified (July 13, 2009) What are the copy protection issues?, Retrieved on 2009-07-28
- ^ DVD Demystified (July 13, 2009) DVD Frequently Asked Questions (and Answers) - Why can't I play movies copied to my hard drive?, Retrieved on 2009-07-28
- ^ a b What are the copy protection schemes used in DVD ? What is CSS ?, Retrieved on 2009-07-28
- ^ a b DVD Demystified (July 13, 2009) What are .IFO, .VOB, .AOB, and .VRO files? How can I play them?, Retrieved on 2009-07-28
- ^ Doom9's forum (2002-2005) DVD-RAM *.VRO File Conversion, Retrieved on 2009-07-28
- ^ DVD-VR Application format notes, Retrieved on 2009-07-28