{
  "$schema": "/api/schemas/documents.schema.json",
  "apiVersion": "1.0.0",
  "generatedAt": "2026-05-30T05:51:04.409Z",
  "sourcePath": "src/main/data/docs",
  "docId": "SMPTE.EG40.2012",
  "document": {
    "abstract": "This guideline specifies a set of formulas for converting between “SMPTE 12M time code” (correctly SMPTE ST 12-1 time code), MPEG-2 systems layer program clock reference (PCR) time base, and local wall clock time. Included are formulas for converting SMPTE ST 12-1 time address values and MPEG-2 PCR time base values to local wall clock time, and formulas for converting SMPTE ST 12-1 time address values directly to/from MPEG-2 PCR time base values. Local wall clock time conversion formulas are useful for converting between different frame rates of SMPTE ST 12-1 time code; e.g., a 24-fps SMPTE time code running at 23.976 fps could be converted to true time and then to a 29.97 drop frame SMPTE time code value. Finally, a discussion of how ST 12-1 time code may be carried within the coded video structures of both MPEG-2 and MPEG-4 AVC is provided.",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "approvalDate": "2012",
    "approvalDate$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "copyright": {
      "holder": "Society of Motion Picture and Television Engineers, Inc.",
      "holder$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.813Z"
      },
      "year": "2012",
      "year$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.813Z"
      }
    },
    "copyright$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "docId": "SMPTE.EG40.2012",
    "docId$meta": {
      "confidence": "high",
      "note": "Calculated from parsed/inferred metadata",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "docLabel": "SMPTE EG 40:2012",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from parsed/inferred typenumber/number/date",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "docNumber": "40",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from HTML pubNumber meta tag",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "docTitle": "Conversion of Time Values between SMPTE ST 12-1 Time Code, MPEG-2 PCR Time Base and Absoute Time",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Concatenated suite title and publication title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "docType": "Engineering Guideline",
    "docType$meta": {
      "confidence": "high",
      "note": "Publication type parsed from HTML",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "doi": "10.5594/SMPTE.EG40.2012",
    "doi$meta": {
      "confidence": "medium",
      "note": "Constructed from parsed/inferred type/date",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "familyId": "40",
    "familyId$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "group": "smpte-32nf-tc",
    "group$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "href": "https://doi.org/10.5594/SMPTE.EG40.2012",
    "href$meta": {
      "confidence": "high",
      "note": "URL generated and verified via redirect resolution",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "icsCodes": [
      {
        "code": "33.160.01",
        "description": "Audio, video and audiovisual systems in general"
      },
      {
        "code": "33.170",
        "description": "Television and radio broadcasting"
      }
    ],
    "icsCodes$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "isbn": "978-1-61482-717-7",
    "isbn$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "keywords": [
      "Communication",
      "Networking and Broadcast Technologies",
      "Television",
      "Time & Sync",
      "MPEG"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "pages": "1–21",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "productNumber": "SSD001703",
    "productNumber$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "publicationDate": "2012-11-28",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from HTML pubDateTime meta tag",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "publisher": "SMPTE",
    "publisher$meta": {
      "confidence": "high",
      "note": "Parsed from HTML publisher meta tag",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "publisherLocation": {
      "city": "White Plains, NY",
      "city$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.813Z"
      },
      "country": "USA",
      "country$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.813Z"
      }
    },
    "publisherLocation$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "references": {
      "bibliographic": [
        "SMPTE.ST12-1.2008",
        "SMPTE.ST339.2008",
        "ISO.13818-1",
        "ISO.13818-2",
        "ISO.14496-10",
        "SMPTE.ST170.2004",
        "SMPTE.ST272.2004",
        "SMPTE.ST340.2008",
        "IEC.60461",
        "R-REC-BT.470-7",
        "AES11.2009"
      ],
      "bibliographic$meta": {
        "confidence": "high",
        "note": "Extracted from sibling -ref.xml via extractSmpteSourceRefs.js",
        "source": "parsed",
        "updated": "2026-05-19T00:07:42.123Z"
      }
    },
    "releaseTag": "20121128-pub",
    "releaseTag$meta": {
      "confidence": "high",
      "note": "Release tag parsed from URL folder structure",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/eg40/20121128-pub/",
      "updated": "2025-10-10T19:32:10.741Z"
    },
    "resolvedHref": "https://pub.smpte.org/doc/eg40/20121128-pub/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": "https://my.smpte.org/s/product-details?id=a1BVR0000008kXN",
      "overridden": true,
      "source": "resolved",
      "updated": "2025-11-11T04:45:58.594Z",
      "version": "extractDocs.js@commit:dea962f9e9d7"
    },
    "standardId": "20246",
    "standardId$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08242015 STANDARDS REVISED DEPOSIT/smptes_eg-40-2012_1/eg0040-2012.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.813Z"
    },
    "status": {
      "active": false,
      "active$meta": {
        "confidence": "high",
        "note": "Calculated from the releaseTag(s) and other status values",
        "originalValue": null,
        "source": "resolved",
        "updated": "2025-10-10T19:32:10.741Z"
      },
      "amended": false,
      "amended$meta": {
        "confidence": "high",
        "note": "Parsed from wrapper #amendments",
        "originalValue": null,
        "source": "parsed",
        "updated": "2025-10-10T19:32:10.741Z"
      },
      "latestVersion": false,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Calculated from the releaseTag(s)",
        "originalValue": null,
        "source": "resolved",
        "updated": "2025-10-10T19:32:10.741Z"
      },
      "superseded": true,
      "superseded$meta": {
        "confidence": "high",
        "note": "Calculated from the releaseTag(s)",
        "originalValue": null,
        "source": "resolved",
        "updated": "2025-10-10T19:32:10.741Z"
      },
      "supersededBy": [
        "SMPTE.EG40.2016"
      ],
      "supersededBy$meta": {
        "confidence": "high",
        "note": "Calculated from the releaseTag(s)",
        "originalValue": [],
        "source": "resolved",
        "updated": "2025-10-10T19:32:10.741Z"
      },
      "supersededDate": "2016-07-29",
      "supersededDate$meta": {
        "confidence": "high",
        "note": "Calculated as the publication date of the next base release (from releaseTag)",
        "originalValue": null,
        "source": "resolved",
        "updated": "2025-10-10T19:32:10.741Z"
      }
    }
  }
}