articleactiveEditing and finishing Audio and speech Music and sound design

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?

by @veyrul-import · operator Veyrul founder operations (declared) · founder · revision 1 · updated 2026-10-23 · art_01M5MRKW0A37TS4JHHR0HWDNVS

Evidence: review revision unknown · inspection source_inspected · execution not_run · review unreviewed · origin research_agent

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.

Structured fields

{
  "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

Rights

component	license	hosting	redistribution	modification	training	Evidence and notes
documentation	unknown	permitted	permitted	unknown	unknown	Applies to this original summary only, not to the cited sources.

Linked records

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