{
  "fileFormatID": 2277,
  "formatName": "Web Video Text Tracks (WebVTT) Format",
  "version": null,
  "formatDescription": "WebVTT files are used for captioning or subtitling video content. It is a standard created by the World Wide Web Consortium (W3C) for displaying timed text, and is linked to the HTML5 <track> element. The primary purpose of WebVTT files is to add text overlays to a video. Each time interval is specified in the format (HH:)mm:ss.xxx --> (HH:)mm:ss:xxx e.g. 00:00.000 --> 00:02.310 or 01:00:05.000 --> 01:00:07.000. The (HH:) is optional, but if included must have a minimum of 2 digits representing the hour (more than 2 digits may be used), and where both the minute (mm) and second (ss) parts must be between 00 and 59 inclusive.",
  "releaseDate": null,
  "binaryFileFormat": null,
  "formatNote": "https://www.w3.org/TR/webvtt1/\r\nhttps://developer.mozilla.org/en-US/docs/Web/API/WebVTT_API \r\nhttps://www.iana.org/assignments/media-types/text/vtt",
  "lastUpdatedDate": "13 Mar 2023",
  "formatProvenance": null,
  "formatSourceDate": "16 Nov 2020",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Text (Structured)",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "fmt/1454",
      "identifierType": "PUID"
    },
    {
      "identifierText": "text/vtt",
      "identifierType": "MIME"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 1819,
      "name": "Web Video Text Tracks (WebVTT)",
      "note": "Absolute from beginning of file, offset 0-4, magic bytes: WEBVTT {10-40}  then a time stamp in the format xx:xx.xxx followed by --> {0-5} followed by xx:xx.xxx (where x is a number).",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 0,
          "maxOffset": 4,
          "byteSequence": "574542565454{5-400}[30:35][30:39]3A[30:35][30:39]2E[30:39][30:39][30:39]202D2D3E20{0-5}[30:35][30:39]3A[30:35][30:39]2E[30:39][30:39][30:39]",
          "endianness": null,
          "byteSequenceID": 2110
        }
      ]
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "vtt",
      "signatureType": "File extension"
    }
  ],
  "relationships": [],
  "supportedBy": [
    200
  ],
  "developedBy": [
    200
  ],
  "submittedBy": [
    249
  ]
}