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Format

Video Object File (MPEG-2 subset)

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Summary

Name
Video Object File (MPEG-2 subset)
Identifiers
PUID: fmt/425
Format type
Video
Description
A Video Object File (or VOB) is a strict subset of the MPEG-2 Program Stream, primarily used within DVD video. A VOB will contain an extended private stream containing both 'Packet Control Information', and 'Data Search Information'.
File extensions
vob
Source
Digital Preservation Department / The National Archives

Relationships

Has priority over
Is subtype of

Internal signatures

Video Object File

Note
Same as BOF sequence for MPEG 1 & 2 but variation on last byte. VAR is seeking presence of Private Stream with ‘Packet Control Information’, then ‘Data Search Information’ respectively

Byte sequences

Min Frag Length
Absolute from BOF
Offset
0
Max offset
0
Byte Sequence
000001BA{8-11}000001(BB|BD|BE|E0)
Endianness
None
Min Frag Length
Variable
Offset
None
Max offset
None
Byte Sequence
000001BF03D400{979}000001BF03FA01
Endianness
None

Changelog

  • Updated in V115

    Release date
    15 November 2023

    Video Object File (MPEG-2 subset): Modified the offset values from null to 0 as part of a project to match PRONOM data with the xsd standard. Submitted by Digital Preservation Department, The National Archives (UK) (UK).

  • Updated in V78

    Release date
    23 September 2014

    Video Object File (MPEG-2 subset): Re-added priority over MPEG-1 and MPEG-2 Programme Streams

  • Updated in V75

    Release date
    17 July 2014

    Video Object File (MPEG-2 subset): Removed priority relationships with MPEG-1 Program Stream and MPEG-2 Program Stream.

  • Updated in V67

    Release date
    26 February 2013

    Video Object File (MPEG-2 subset): Renamed from 'Video Object File'. Provided further descriptive information and improved binary signature through PRONOM Research.

  • Updated in V62

    Release date
    28 August 2012

    Video Object File: Existing signature refined through PRONOM Research.

  • Added in V60

    Release date
    11 June 2012

    Video Object File: Signature developed through PRONOM Research.

    Video Object File: Outline entry added.