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James RussoandClaude Opus 4.7
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* feat(producer): enable webm in distributed mode via concat-copy PR 8.2 of the WebM distributed-rendering plan (v1.5 backlog #1; see DISTRIBUTED-RENDERING-PLAN.md §7.2). Wires libvpx-vp9 webm through the distributed pipeline now that PR 8.1 proved concat-copy works. Architectural decision: Path A (concat-copy) — based on PR 8.1's smoke test result (9/9 tests pass for both yuv420p and yuva420p VP9 streams). The simpler architecture wins; no re-encode in assemble, no encode- parallelism loss. Changes: - plan.ts: - DistributedRenderConfig.format and PlanResult.format now include "webm" — type-level acceptance matches the runtime gate. - rejectUnsupportedDistributedFormat() no longer trips on webm. HDR mp4 remains the only refused configuration. - resolveEncoderTriple() returns libvpx-vp9-software + yuva420p + preset="good" for format="webm". yuva420p preserves alpha — the format's main reason for existing for web delivery. - codec= remains rejected for non-mp4 formats (mov is always ProRes 4444; webm is always libvpx-vp9). The error message lists all four distributed-supported formats. - FormatNotSupportedInDistributedError docstring updated to reflect the new reality (only HDR is unsupported). - freezePlan.ts: LockedRenderConfig.encoder gains "libvpx-vp9-software". Mirrors libx265-software / prores-software / png-sequence in shape; the chunk worker reads this discriminant to decide encode args. - renderChunk.ts: drops the now-incorrect cast that excluded webm from buildSyntheticRenderJob's format input; tightens the preset-format cast to include webm. - assemble.ts: docstring + comment updates. The mp4/mov concat-copy path is format-agnostic — webm uses the exact same code (applyFaststart is a no-op for webm via the existing chunkEncoder.ts gate; muxVideoWithAudio already routes webm to libopus audio). - planFormatBanlist.test.ts: webm-rejection tests removed; replaced with "accepts webm" tests + a HDR+webm combo test that verifies HDR is the trip regardless of format. - plan.test.ts: new describe block pins the webm wiring contract: format="webm" produces an encoder=libvpx-vp9-software / pixelFormat=yuva420p planDir with closedGop=true and gopSize=chunkSize. - webm-concat-copy.test.ts (smoke): extended with a yuva420p variant that proves the alpha pixel format the distributed pipeline actually emits also round-trips through concat-copy. 9/9 tests pass locally. §8 format support matrix in DISTRIBUTED-RENDERING-PLAN.md is intentionally left unchanged at this PR — it flips to ✓ in PR 8.4 once the end-to-end fixture (PR 8.3) is green. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(producer): include webm in plan-time needsAlpha + strengthen alpha smoke PR review feedback from Miguel and Vai on #951 caught a real bug: `plan.ts`'s `needsAlpha` disjunction excluded `"webm"`, so the plan stage froze `forceScreenshot: false` into the `LockedRenderConfig` even though distributed webm uses `yuva420p`. Every chunk worker captured opaque RGB via BeginFrame (which doesn't preserve alpha on Linux headless-shell), and libvpx-vp9 encoded uniformly-opaque alpha that the encoder then dropped — producing un-keyable webm. Two changes: 1. **plan.ts**: include `"webm"` in `needsAlpha`. Matches the in-process renderer's logic at `renderOrchestrator.ts:1469` (`const needsAlpha = isWebm || isMov || isPngSequence`); the two sites must stay in sync since the distributed pipeline's PSNR regression compares against the in-process baseline. 2. **Smoke test (yuva420p describe)**: source frames now use a real alpha gradient (`geq=a='X*255/W'` on top of `testsrc2`) instead of `testsrc2 + format=rgba` which was uniformly opaque. The decode- pix_fmt assertion is dropped (ffprobe reports `yuv420p` for VP9-with-alpha because the alpha lives in a Matroska `BlockAdditional` sidecar) and replaced with two stronger checks: - `TAG:ALPHA_MODE=1` is present on the stream — proves the encoder was actually configured for alpha - alpha plane variance after `-c:v libvpx-vp9 -i ... -pix_fmt rgba -vf extractplanes=a,signalstats` — proves the alpha sub-stream round-trips through concat-copy with spatially-varying content, not uniform/dropped alpha - decode-test gate is now exit-code-only (was `exitCode || stderr` which would flake on chatty ffmpeg `-v error` builds emitting non-fatal DTS/container notes) These checks would have caught the `needsAlpha` bug before review. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(aws-lambda): widen narrow format types to include webm CI on PR #951 was failing at typecheck/build because the producer's `DistributedRenderConfig.format` widened to include webm in this PR but the aws-lambda package's narrow `"mp4" | "mov" | "png-sequence"` type literals in `events.ts`, `handler.ts`, and `validateConfig.ts` hadn't kept up. `renderToLambda.ts:87` passed `config.format` (now including webm) into a parameter typed against the narrow union, producing TS2345. This widening originally landed in PR #952 (test fixture PR) but needs to be atomic with the producer's widening here to keep each PR independently typecheck-clean. Also refactor `formatExtension` from a switch dispatch to a `Record<DistributedFormat, string>` lookup. Adding the webm case tipped the switch's CRAP to the 30.0 fallow threshold; the lookup table drops cyclomatic from 5 to 1 with the same compile-time exhaustiveness guarantee (TS errors on missing entries when `DistributedFormat` adds a new format). The runtime `_exhaustive: never` throw was only protecting against a string slipping past TS; `validateConfig.ts`'s `ALLOWED_FORMATS` already gates untrusted input at the SDK boundary. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * test(producer): add webm-vp9 distributed regression fixture PR 8.3 of the WebM distributed-rendering plan (v1.5 backlog #1; see DISTRIBUTED-RENDERING-PLAN.md §7.2). End-to-end regression coverage for the webm distributed path PRs 8.1 and 8.2 wired up. Adds packages/producer/tests/distributed/webm-vp9/ matching the mp4-h264-sdr fixture pattern: a 2-second composition (60 frames @ 30fps) with text, a crossfade across the frame-30 chunk seam, and a continuous icon rotation — exercises chunk-boundary continuity for both display contents and VP9 closed-GOP alpha encoding. `chunkSize: 15` produces 4 chunks so 3 seams are tested, and the crossfade straddles the middle seam to surface alpha-plane discontinuities introduced by alt-ref drift. Baseline regenerated inside Dockerfile.test via `bun run --cwd packages/producer docker:test:update webm-vp9`. Runs in: - in-process mode: byte-identical match against baseline ✓ - distributed-simulated mode: PSNR 56.88-63.49 dB across 100 checkpoints, well above the 30 dB threshold ✓ Wiring updates required to let webm flow through the harness: - regression-harness-distributed.ts: - checkDistributedSupport() no longer rejects webm. HDR mp4 + NTSC fps + non-{24,30,60} fps remain rejected. - RunDistributedSimulatedInput.format widened to include webm. - Docstring + comments updated. - regression-harness-distributed.test.ts: webm-rejection test replaced with "accepts format=webm" test. - regression-harness.ts: the now-incorrect format cast at the distributed-input call site is dropped; comment about why webm was excluded is replaced with "webm is now distributed-supported". - regression-harness-lambda-local-types.ts: RunLambdaLocalInput.format widened to include webm so lambda-local mode can also exercise webm fixtures end-to-end. - aws-lambda webm support (Path A through the Lambda handler): - formatExtension.ts: DistributedFormat gains "webm" → ".webm" case. - events.ts: RenderChunkEvent / AssembleEvent / PlanLambdaResult Format widened to include webm. - sdk/validateConfig.ts: ALLOWED_FORMATS gains "webm". - handler.ts: downloadChunkObjects format param widened. The Lambda handler delegates to the producer's assemble() primitive which PR 8.2 already taught to handle webm (concat-copy + applyFaststart no-op + muxVideoWithAudio with libopus); no Lambda-side rendering changes are needed beyond the type/validation surfaces above. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * docs(aws-lambda): drop stale webm rejection from validateConfig docblock PR #952 review nit (Miguel): the validateConfig.ts file-header comment still claimed the SDK rejects webm, but the runtime check no longer does (ALLOWED_FORMATS now includes 'webm'). Update the docblock to reflect that only force-hdr remains an SDK-side rejection. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * ci(regression): add webm-vp9 to shard-3 + refactor formatExtension Three follow-ups bundled together (Vai's review feedback on PR #952 plus the fallow audit finding that surfaced when the webm case was added): 1. **Wire webm-vp9 into CI regression.** The fixture was added in this PR but never appeared in any `.github/workflows/regression.yml` shard's args allowlist, so the regression harness's positional-args gate skipped it in CI. Append `webm-vp9` to shard-3 (which already carries `mp4-h264-sdr` + `webm-transparency`) so the fixture runs. 2. **Fix stale "four hard gates" prose in checkDistributedSupport docstring.** Earlier in the stack I removed the webm bullet but didn't update the count. Two gates remain (fps + hdr). 3. **Refactor `formatExtension` from switch to lookup table.** Adding the webm case made the switch dispatch's CRAP score hit 30.0 (cyclomatic = 5, plus the function's small body). Replaced with a `Record<DistributedFormat, string>` lookup, which: - drops cyclomatic from 5 → 1, - keeps exhaustiveness enforcement at compile time (TS errors if a new format gets added to `DistributedFormat` without a matching key in the Record literal), - drops the runtime `_exhaustive: never` throw, which was only guarding against an arbitrary string slipping past TS — a caller-side concern, not this function's job. The function now reads as a table lookup, which matches what it actually does, and the fallow audit now reports zero new complexity findings (down from 1). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>