<?xml version="1.0" encoding="utf-8"?>
<PRONOM-Report xmlns="http://pronom.nationalarchives.gov.uk">
  <report_format_detail>
    <FileFormat>
      <FormatID>1207</FormatID>
      <FormatName>Video Object File (MPEG-2 subset)</FormatName>
      <FormatVersion>
      </FormatVersion>
      <FormatAliases>
      </FormatAliases>
      <FormatFamilies>
      </FormatFamilies>
      <FormatTypes>Video</FormatTypes>
      <FormatDisclosure>
      </FormatDisclosure>
      <FormatDescription>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'.</FormatDescription>
      <BinaryFileFormat>
      </BinaryFileFormat>
      <ByteOrders>
      </ByteOrders>
      <ReleaseDate>
      </ReleaseDate>
      <WithdrawnDate>
      </WithdrawnDate>
      <ProvenanceSourceID>1</ProvenanceSourceID>
      <ProvenanceName>Digital Preservation Department / The National Archives</ProvenanceName>
      <ProvenanceSourceDate>11 Jun 2012</ProvenanceSourceDate>
      <ProvenanceDescription>11/2023 (v.115)- Modified the offset values in the internal signature from null to 0 as part of a project to match PRONOM data with the xsd standard. Internally researched.</ProvenanceDescription>
      <LastUpdatedDate>15 Nov 2023</LastUpdatedDate>
      <FormatNote>
      </FormatNote>
      <FormatRisk>
      </FormatRisk>
      <TechnicalEnvironment>
      </TechnicalEnvironment>
      <FileFormatIdentifier>
        <Identifier>fmt/425</Identifier>
        <IdentifierType>PUID</IdentifierType>
      </FileFormatIdentifier>
      <ExternalSignature>
        <ExternalSignatureID>1213</ExternalSignatureID>
        <Signature>vob</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <InternalSignature>
        <SignatureID>636</SignatureID>
        <SignatureName>Video Object File</SignatureName>
        <SignatureNote>Same as BOF sequence for MPEG 1 &amp; 2 but variation on last byte. VAR is seeking presence of Private Stream with ‘Packet Control Information’, then ‘Data Search Information’ respectively</SignatureNote>
        <ByteSequence>
          <ByteSequenceID>787</ByteSequenceID>
          <PositionType>Absolute from BOF</PositionType>
          <Offset>0</Offset>
          <MaxOffset>0</MaxOffset>
          <IndirectOffsetLocation>
          </IndirectOffsetLocation>
          <IndirectOffsetLength>
          </IndirectOffsetLength>
          <Endianness>
          </Endianness>
          <ByteSequenceValue>000001BA{8-11}000001(BB|BD|BE|E0)</ByteSequenceValue>
        </ByteSequence>
        <ByteSequence>
          <ByteSequenceID>1007</ByteSequenceID>
          <PositionType>Variable</PositionType>
          <Offset>
          </Offset>
          <MaxOffset>
          </MaxOffset>
          <IndirectOffsetLocation>
          </IndirectOffsetLocation>
          <IndirectOffsetLength>
          </IndirectOffsetLength>
          <Endianness>
          </Endianness>
          <ByteSequenceValue>000001BF03D400{979}000001BF03FA01</ByteSequenceValue>
        </ByteSequence>
      </InternalSignature>
      <RelatedFormat>
        <RelationshipType>Has priority over</RelationshipType>
        <RelatedFormatID>659</RelatedFormatID>
        <RelatedFormatName>MPEG-1 Program Stream</RelatedFormatName>
        <RelatedFormatVersion>
        </RelatedFormatVersion>
      </RelatedFormat>
      <RelatedFormat>
        <RelationshipType>Has priority over</RelationshipType>
        <RelatedFormatID>660</RelatedFormatID>
        <RelatedFormatName>MPEG-2 Program Stream</RelatedFormatName>
        <RelatedFormatVersion>
        </RelatedFormatVersion>
      </RelatedFormat>
      <RelatedFormat>
        <RelationshipType>Is subtype of</RelationshipType>
        <RelatedFormatID>660</RelatedFormatID>
        <RelatedFormatName>MPEG-2 Program Stream</RelatedFormatName>
        <RelatedFormatVersion>
        </RelatedFormatVersion>
      </RelatedFormat>
    </FileFormat>
    <SearchCriteria>Criteria</SearchCriteria>
  </report_format_detail>
</PRONOM-Report>
