docs(vmaf): research digest + ADR-1122 for VMAF v1 model port - #1082
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Netflix shipped VMAF v1 in libvmaf v3.2.0 (June 2026): still a libsvm nu-SVR fusion, but VIF is removed and CAMBI (banding) + speed_chroma (chroma) become core features; ADM/motion move to adm3/motion3. Six built-in models for 1080p@3H / phone@5H / 4K@1.5H / 4K@3H (last on a [0,110] range) + HFR variants; Netflix recommends 10-bit measurement even for 8-bit SDR. Adds a cited research digest and ADR-1122 deciding to adopt v1 as an opt-in generation (v0.6.1 stays default), with the port scope: build in the JSONs, fix SYCL cambi/speed_chroma (now core, currently failing on Arc A380), handle the [0,110] range end-to-end, plumb CAMBI enc params, and add new v1 golden refs in separate tests (v0.6.1 golden pairs untouched). Aligns with the zero-copy 10-bit work (ADR-1121, PR VMAFx#1081). Refs ADR-1122. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YCP4JCoduujJgccDRGvNKv
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Summary
Netflix shipped VMAF v1 in libvmaf
v3.2.0(June 2026). This PR adds a citedresearch digest and ADR-1122 deciding how the fork adopts it: opt-in v1
generation,
vmaf_v0.6.1stays default. Docs-only (planning) — no code yet.Key finding: v1 is still a libsvm ν-SVR fusion, but VIF is removed and CAMBI
(banding) +
speed_chroma(chroma) become core features (ADM/motion → adm3/motion3).Six built-in models (1080p@3H, phone@5H, 4K@1.5H, 4K@3H — last on [0, 110]) + HFR
variants; Netflix recommends 10-bit even for 8-bit SDR (aligns with ADR-1121 / PR #1081).
Type
docs— documentation onlyChecklist
docs/adr/_index_fragments/1122-*.md+_order.txt(README regenerated).Bug-status hygiene (ADR-0165)
no state delta: planning ADR, not a bug open/close/rule-out.Deep-dive deliverables (ADR-0108)
docs/research/2026-07-01-vmaf-v1-models.md.## Alternatives considered(opt-in vs v1-default vs don't-port vs models-only).AGENTS.mdinvariant note — no rebase-sensitive invariants: docs-only planning ADR, no code touched.Known follow-ups
The v1 implementation (build in JSONs, fix SYCL
cambi/speed_chroma,[0,110]handling, CAMBI enc-params, v1 golden tests, upstream sync to v3.2.0) is scoped in
ADR-1122 and tracked as a follow-up port — this PR only lands the decision + research.
🤖 Generated with Claude Code
https://claude.ai/code/session_01YCP4JCoduujJgccDRGvNKv