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hdr-hlg-regression
Regression test that locks down end-to-end HDR HLG (BT.2020 ARIB STD-B67)
video rendering. Companion to hdr-regression (PQ), kept as a separate suite
so the HLG-specific encoder/metadata path stays tested in isolation.
What it covers
| Window | Time | Shape | Expected |
|---|---|---|---|
| A | 0.0 – 2.5 s | Baseline HLG video + DOM overlay | pass |
| B | 2.5 – 5.0 s | Wrapper opacity fade around HLG video | pass |
The test pins the contract that:
extractMediaMetadatareportsbt2020/arib-std-b67/limitedfor the HLG source (i.e. HLG is detected and not silently coerced to PQ).isHdrColorSpaceflips the orchestrator into the layered HDR path on the HLG signal.- The HLG source is decoded into
rgb48leand blitted under the SDR DOM overlay on every frame. - Wrapper-opacity composition (window B) does not break HLG pass-through.
hdrEncoderwrites HEVC Main10 /yuv420p10le/ BT.2020 HLG with the correct color tags (no PQ mastering display metadata for HLG).
The suite is intentionally short (5 s, two windows) — it exists to detect
regressions in the HLG-specific code path, not to enumerate every composition
shape (those live in hdr-regression).
Fixture
src/hdr-hlg-clip.mp4 — last 5 seconds of a user-recorded HEVC HLG clip,
remuxed (no re-encode) so the HLG color tags survive verbatim.
Running
cd packages/producer
bun run test:regression hdr-hlg-regression
bun run test:regression:update hdr-hlg-regression
In CI it runs in the hdr shard alongside hdr-regression
(see .github/workflows/regression.yml).