{
  "fileFormatID": 924,
  "formatName": "MPEG-4 Media File",
  "version": null,
  "formatDescription": "Container format that can contain any of a number of audio and video codecs. It may also contain subtitle data or file metadata. This family of container can be used with several different file extensions.",
  "releaseDate": null,
  "binaryFileFormat": "Text",
  "formatNote": null,
  "lastUpdatedDate": "9 Jun 2026",
  "formatProvenance": "08/2023 (v.113) - Priority added over fmt/1616 (BibTeX Database File). Internally researched; 04/2024 (v.118): Description added as part of PRONOM Research Week 2023. Submitted by The Church of Jesus Christ of Latter-day Saints; v.123- New extension added of .m4b. Submitted by Archives New Zealand.",
  "formatSourceDate": "27 Oct 2009",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Audio, Video",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "application/mp4",
      "identifierType": "MIME"
    },
    {
      "identifierText": "fmt/199",
      "identifierType": "PUID"
    },
    {
      "identifierText": "video/mp4",
      "identifierType": "MIME"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 278,
      "name": "MP4 Media File",
      "note": "Represents the following character sequence: {4}ftyp{0-64}(mp42|mp41|isom|iso2)*moov",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 4,
          "maxOffset": null,
          "byteSequence": "66747970{0-64}(6D703432|6D703431|69736F6D|69736F32)*6D6F6F76",
          "endianness": "Little-endian",
          "byteSequenceID": 357
        }
      ],
      "provenance": "DROID 5.0 research."
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "mp4",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "m4v",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "m4a",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "f4v",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "f4a",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "m4b",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "",
      "signatureType": "File extension"
    }
  ],
  "relationships": [
    {
      "relationshipType": "Has lower priority than",
      "relatedFormatID": 1103,
      "relatedFormatName": "3GPP Audio/Video File",
      "relatedFormatPUID": "fmt/357"
    },
    {
      "relationshipType": "Has lower priority than",
      "relatedFormatID": 1388,
      "relatedFormatName": "Apple Lossless Audio Codec",
      "relatedFormatPUID": "fmt/596"
    },
    {
      "relationshipType": "Has lower priority than",
      "relatedFormatID": 2422,
      "relatedFormatName": "Canon Raw",
      "relatedFormatPUID": "fmt/1595"
    },
    {
      "relationshipType": "Has priority over",
      "relatedFormatID": 658,
      "relatedFormatName": "Quicktime",
      "relatedFormatPUID": "x-fmt/384"
    },
    {
      "relationshipType": "Has priority over",
      "relatedFormatID": 2443,
      "relatedFormatName": "BibTeX Database File",
      "relatedFormatPUID": "fmt/1616"
    },
    {
      "relationshipType": "Has lower priority than",
      "relatedFormatID": 3971,
      "relatedFormatName": "M4A Audio",
      "relatedFormatPUID": "fmt/2094"
    }
  ],
  "submittedBy": [
    1
  ]
}