# Overview: from the set recorder to the delivered package, which carrier holds which kind of information at each audio handoff, and where does the timing or metadata thin out?

- id: art_01M5MRKW0A37TS4JHHR0HWDNVS
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T10, T13, T14 · tags: none
- updated: 2026-10-23T16:13:29.986Z
- url: https://veyrul.com/articles/art_01M5MRKW0A37TS4JHHR0HWDNVS

Along the production-audio chain each carrier has one job: bext a sample-count timestamp, iXML scene/take/track/speed metadata, AAF edit decisions, stems and M&E as separate files that must sum to the mix, and loudness as a measurement whose metadata must match it. Foley handoff had no primary document in the producer's sources (gap).

Along the production-audio chain each carrier has one job: bext a sample-count timestamp, iXML scene/take/track/speed metadata, AAF edit decisions, stems and M&E as separate files that must sum to the mix, and loudness as a measurement whose metadata must match it. Foley handoff had no primary document in the producer's sources (gap).

Curator qualifications: Zero-fetch review 2026-10-22; syntheses not executed. AAF Edit Protocol and AS-11 statements not verified by curator.

Limitations: Zero-fetch review 2026-10-22; syntheses not executed.

Evidence status: curator/producer inference or synthesis from the cited sources (code read, not executed, where code is cited); correlated desk review (Claude); not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://tech.ebu.ch/docs/tech/tech3285.pdf",
      "note": "EBU Tech 3285 bext TimeReference; iXML SPEED; Netflix Sound Mix Specifications v1.4 (snapshot 2021-11-20) section 2; EBU R 128 V5 item p)"
    },
    {
      "url": "http://www.gallery.co.uk/ixml/object_Details.html",
      "note": "EBU Tech 3285 bext TimeReference; iXML SPEED; Netflix Sound Mix Specifications v1.4 (snapshot 2021-11-20) section 2; EBU R 128 V5 item p)"
    },
    {
      "url": "https://static.amwa.tv/as-01-aaf-edit-protocol-spec.pdf",
      "note": "EBU Tech 3285 bext TimeReference; iXML SPEED; Netflix Sound Mix Specifications v1.4 (snapshot 2021-11-20) section 2; EBU R 128 V5 item p)"
    },
    {
      "url": "https://web.archive.org/web/20211120082543id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-4",
      "note": "EBU Tech 3285 bext TimeReference; iXML SPEED; Netflix Sound Mix Specifications v1.4 (snapshot 2021-11-20) section 2; EBU R 128 V5 item p)"
    },
    {
      "url": "https://tech.ebu.ch/docs/r/r128.pdf",
      "note": "EBU Tech 3285 bext TimeReference; iXML SPEED; Netflix Sound Mix Specifications v1.4 (snapshot 2021-11-20) section 2; EBU R 128 V5 item p)"
    },
    {
      "url": "https://github.com/AMWA-TV/AS-11_UK_DPP_HD/blob/12e100a3de2f60592413a0d21f81f343505e0123/specification_text_views/AMWA_AS_11_UK_DPP_HD.simple.txt",
      "note": "EBU Tech 3285 bext TimeReference; iXML SPEED; Netflix Sound Mix Specifications v1.4 (snapshot 2021-11-20) section 2; EBU R 128 V5 item p)"
    }
  ]
}
```

Evidence claims:
- [inference] Along the production-audio chain each carrier has one job: bext a sample-count timestamp, iXML scene/take/track/speed metadata, AAF edit decisions, stems and M&E as separate files that must sum to the mix, and loudness as a measurement whose metadata must match it. Foley handoff had no primary document in the producer's sources (gap). · locator: EBU Tech 3285 bext TimeReference; iXML SPEED; Netflix Sound Mix Specifications v1.4 (snapshot 2021-11-20) section 2; EBU R 128 V5 item p) · source: https://tech.ebu.ch/docs/tech/tech3285.pdf

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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