# How did the audio rules in the Post Production Branded Delivery Specification change between page labels 5.0 (2022-12-09), 5.1 (2024-08-03) and 5.2 (2026-06-06)?

- id: art_01M5MSNXQNQMVK2J8VVCSCZMDJ
- 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 · tags: none
- updated: 2026-10-23T16:32:05.837Z
- url: https://veyrul.com/articles/art_01M5MSNXQNQMVK2J8VVCSCZMDJ

Netflix's Branded Delivery Specifications changed Atmos rules in two steps. Version 5.1 (change log 12 September 2023) removed the separate 2.0 stereo M&E. Version 5.2 (change log 21 October 2024) widened the Atmos group labels from four (Dialog, Music, Effects, Narration) to seven (adding Group ADR, Backgrounds, Foley), made 5.1 and 2.0 deliverables optional for Atmos mixes, and replaced the '-2 dBFS true-peak' sentence with a recommendation to set limiters at -2.3. The separate Atmos requirements page (v2.3, 'updated for parity' with the Branded spec) still showed the older wording in an April 2026 capture, and showed the 5.2 wording by October 2026 (curator cross-check). So the conflicts recorded earlier were a lagging page, and current Netflix pages agree.

Netflix's Branded Delivery Specifications changed Atmos rules in two steps. Version 5.1 (change log 12 September 2023) removed the separate 2.0 stereo M&E. Version 5.2 (change log 21 October 2024) widened the Atmos group labels from four (Dialog, Music, Effects, Narration) to seven (adding Group ADR, Backgrounds, Foley), made 5.1 and 2.0 deliverables optional for Atmos mixes, and replaced the '-2 dBFS true-peak' sentence with a recommendation to set limiters at -2.3. The separate Atmos requirements page (v2.3, 'updated for parity' with the Branded spec) still showed the older wording in an April 2026 capture, and showed the 5.2 wording by October 2026 (curator cross-check). So the conflicts recorded earlier were a lagging page, and current Netflix pages agree.

Curator qualifications: Captures read 2026-10-22; nothing mixed or delivered. Intermediate captures between April and October 2026 not read; exact date the Atmos page caught up unknown.

Limitations: Captures read 2026-10-22; nothing mixed or delivered.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://web.archive.org/web/20260606051638id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/7262346654995-Post-Production-Branded-Delivery-Specifications",
      "note": "Branded Delivery Specifications Version 5.0 (Wayback 20221209064340); Version 5.1 (Wayback 20240803075648); Version 5.2 (Wayback 20260606051638), sections 2.3.1, 3.2.1 and change log 10/21/2024; Netflix Atmos Home Mix Deliverable Requirements v2.3 (live site JSON, 2026-10-22; CA-B503 readback); Atmos v2.3 Wayback 20260422 capture (CA-B503/B506 readback)"
    },
    {
      "url": "https://web.archive.org/web/20240803075648id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/7262346654995-Post-Production-Branded-Delivery-Specifications",
      "note": "Branded Delivery Specifications Version 5.0 (Wayback 20221209064340); Version 5.1 (Wayback 20240803075648); Version 5.2 (Wayback 20260606051638), sections 2.3.1, 3.2.1 and change log 10/21/2024; Netflix Atmos Home Mix Deliverable Requirements v2.3 (live site JSON, 2026-10-22; CA-B503 readback); Atmos v2.3 Wayback 20260422 capture (CA-B503/B506 readback)"
    },
    {
      "url": "https://web.archive.org/web/20221209064340id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/7262346654995-Post-Production-Branded-Delivery-Specifications",
      "note": "Branded Delivery Specifications Version 5.0 (Wayback 20221209064340); Version 5.1 (Wayback 20240803075648); Version 5.2 (Wayback 20260606051638), sections 2.3.1, 3.2.1 and change log 10/21/2024; Netflix Atmos Home Mix Deliverable Requirements v2.3 (live site JSON, 2026-10-22; CA-B503 readback); Atmos v2.3 Wayback 20260422 capture (CA-B503/B506 readback)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Netflix's Branded Delivery Specifications changed Atmos rules in two steps. Version 5.1 (change log 12 September 2023) removed the separate 2.0 stereo M&E. Version 5.2 (change log 21 October 2024) widened the Atmos group labels from four (Dialog, Music, Effects, Narration) to seven (adding Group ADR, Backgrounds, Foley), made 5.1 and 2.0 deliverables optional for Atmos mixes, and replaced the '-2 dBFS true-peak' sentence with a recommendation to set limiters at -2.3. The separate Atmos requirements page (v2.3, 'updated for parity' with the Branded spec) still showed the older wording in an April 2026 capture, and showed the 5.2 wording by October 2026 (curator cross-check). So the conflicts recorded earlier were a lagging page, and current Netflix pages agree. · locator: Branded Delivery Specifications Version 5.0 (Wayback 20221209064340); Version 5.1 (Wayback 20240803075648); Version 5.2 (Wayback 20260606051638), sections 2.3.1, 3.2.1 and change log 10/21/2024; Netflix Atmos Home Mix Deliverable Requirements v2.3 (live site JSON, 2026-10-22; CA-B503 readback); Atmos v2.3 Wayback 20260422 capture (CA-B503/B506 readback) · source: https://web.archive.org/web/20260606051638id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/7262346654995-Post-Production-Branded-Delivery-Specifications

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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