What loudness, peak, sample-rate and stem requirements does Netflix's publicly hosted Sound Mix Specification v1.4 state, and does a Non-Branded spec page add any?

Netflix Sound Mix Specifications & Best Practices v1.4 (change log 2021-11-09; Internet Archive copy) states -27 LKFS +/- 2 LU dialog-gated, peaks not above -2 dB true peak, measured over the full programme per BS.1770-1, with a program-gated fallback of -24 LKFS +/- 2 LU (BS.1770-3) when near-field 5.1 dialog is under 15%. This curl-fetched archive is the preferred pin for the three-route cluster. Curator qualifications: v1.4 is a 2021 snapshot; the live successor (v1.5 per C2-B02-C slug) is not readable by GET (JS shell); do not present v1.4 numbers as current without a dated current text. Applicability to non-branded deliveries is not established (S19 archived body empty). Mixed BS.1770 revisions (-1 for main, -3 for fallback) are as printed; no reconciliation implied. Specification text only; no audio measured or rendered. Curator amendment CA-AM-0002 (2026-10-21): A later offer (C2-B112-J15-01, reviewed in CA-B037) provides an Internet Archive copy of v1.6 dated 2026-08-09 (change log 2024-10-29). X1-13 v1.4 (2021) remains a valid historical pin, but the preferred current-dated text for the cluster is now the v1.6 archive. Numbers unchanged (-27 LKFS +/-2 LU dialog-gated, -2 dBTP); v1.6 marks the -24 LKFS program-gated fallback as non-mandatory best practice. Limitations: Archived 2021 page; Specification text only; no audio measured or rendered. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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      "note": "cited at https://web.archive.org/web/20211120082543id_/https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-4; archive id_ 20211120082543, gzip body decompressed by curator; sections 1, 4.1, Change Log OC-1-4; GET partnerhelp article 360001794307 (2026-10-21)"
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