remotion-to-hyperframes

# Remotion to HyperFrames > **Confirm the route before you build.** Use this **only** to port an existing **Remotion** (React) composition's source into HyperFrames. Authoring a **new** composition (even one inspired by a Remotion video) → the creation workflows / `/general-video`. **Out of scope** (one-way, Remotion-only): no reverse export (HyperFrames → Remotion or any framework), and a **non-Remotion** source (After Effects, Framer Motion, plain React / CSS) has no Remotion source to translate → re-create via `/general-video`. Unsure, or only a passing Remotion mention? **Read `/hyperframes` first.** ## Overview Translate Remotion (React-based) video compositions into HyperFrames (HTML + GSAP) compositions. Most Remotion idioms have direct HyperFrames equivalents — the translation is mechanical for ~80% of typical compositions. This skill encodes the mapping and guards against the lossy 20% by refusing to translate patterns that don't fit HF's seek-driven model and recommending the runtime interop pattern from [PR #214](https://github.com/heygen-com/hyperframes/pull/214) instead. The skill ships with a **tiered test corpus** (T1–T4, 4 fixtures total) that grades translations against measured SSIM thresholds. Don't translate without running the eval — a translation that "looks right" but renders 0.05 SSIM lower than the validated baseline is silently wrong. ## When to use **Use this skill ONLY when the user explicitly asks to migrate from Remotion.** Example trigger phrases: - "port my Remotion project to HyperFrames" - "convert this Remotion code to HyperFrames" - "migrate from Remotion" - "translate this Remotion comp" - "rewrite this as HyperFrames HTML" **Do NOT use this skill when:** - (a) The user is authoring a **new** HyperFrames composition, even if they have or are A/B-testing a similar Remotion video. - (b) The user mentions Remotion in passing without asking for migration. - (c) The user shares Remotion code as reference material rather than asking for a translation. - (d) The user asks for "the same video as my Remotion one" without explicitly asking to migrate the source — treat that as a fresh HyperFrames build. **NOT SUPPORTED (decline — this is not what this skill does):** - **The reverse direction.** Exporting a HyperFrames composition back out _to_ Remotion (or to any other framework) is not a workflow — the translation is Remotion → HyperFrames only. Say so plainly. - **Non-Remotion sources.** An After Effects project (`.aep`), a Framer Motion / plain-React / CSS animation, or any other tool's source is not a Remotion composition — there is no Remotion source to translate. Re-create it natively via `/general-video`, or decline if HyperFrames can't represent it. When in doubt, default to authoring a native HyperFrames composition with `/general-video` (the general HyperFrames authoring flow) instead. ## Workflow ### Step 1: Lint the source Run [`scripts/lint_source.py`](scripts/lint_source.py) over the Remotion source directory. The lint detects patterns that can't translate cleanly: - **Blockers** (refuse + recommend interop): `useState`, `useReducer`, `useEffect`/`useLayoutEffect` with non-empty deps, async `calculateMetadata`, third-party React UI libraries (MUI, Chakra, Mantine, antd, shadcn, Radix, NextUI). - **Warnings** (translate after dropping the construct): `@remotion/lambda` config, `delayRender`, `useCallback`, `useMemo`, custom hooks. - **Info** (translate with note): `staticFile`, `interpolateColors`. If any blocker fires, **stop**. Read [`references/escape-hatch.md`](references/escape-hatch.md) and surface the recommendation message. Warnings don't stop translation — drop the offending construct in step 3 and note the gap in `TRANSLATION_NOTES.md`. `@remotion/lambda` config is the canonical warning case: the skill drops the import + `renderMediaOnLambda(...)` calls but translates the rest of the composition. ### Step 2: Plan the translation Read [`references/api-map.md`](references/api-map.md) — the index of every Remotion API and its HF equivalent or per-topic reference. Identify which topic references you'll need based on what the source uses: | Source contains | Load reference | | ------------------------------------------------------------------------- | --------------------------------------------- | | `Composition`, `defaultProps`, `schema`, `calculateMetadata` | [`parameters.md`](references/parameters.md) | | `Sequence`, `Series`, `Loop`, `AbsoluteFill`, `Freeze` | [`sequencing.md`](references/sequencing.md) | | `useCurrentFrame`, `interpolate`, `spring`, `Easing`, `interpolateColors` | [`timing.md`](references/timing.md) | | `Audio`, `Video`, `Img`, `IFrame`, `staticFile`, `delayRender` | [`media.md`](references/media.md) | | `TransitionSeries`, `@remotion/transitions` | [`transitions.md`](references/transitions.md) | | `@remotion/lottie` | [`lottie.md`](references/lottie.md) | | `@remotion/google-fonts/<Family>`, `Font.loadFont`, `@font-face` | [`fonts.md`](references/fonts.md) | Don't load all of them — load only what the specific source needs. ### Step 3: Generate the HF composition Emit `index.html` with: - Root `<div id="stage">` carrying the composition's `data-composition-id`, `data-start="0"`, `data-duration` (in seconds), `data-fps`, `data-width`, `data-height`, plus one `data-*` per scalar prop. - A flat list of scene divs with `data-start` / `data-duration` / `data-track-index`. - Inline `<style>` for layout; CSS sets the `from` state of every animated property. - A single `<script>` tag at the bottom containing one paused `gsap.timeline({paused: true})`. Every Remotion `useCurrentFrame()` derivation becomes a tween on this timeline at the right offset. - `window.__timelines["<composition-id>"] = tl;` registers the timeline with HF's runtime. Custom React subcomponents inline as repeated HTML using the prop interface as the template (see [`parameters.md`](references/parameters.md) for the per-instance `data-*` pattern). ### Step 4: Validate Run the eval harness — [`references/eval.md`](references/eval.md) for the full guide. Quick path: ```bash # Render Remotion baseline (after npm install in the fixture) cd remotion-src && npx remotion render <CompositionId> out/baseline.mp4 # Render HF translation cd ../hf-src && npx hyperframes render --output ../hf.mp4 # SSIM diff ../../scripts/render_diff.sh ./remotion-src/out/baseline.mp4 ./hf.mp4 ./diff ``` Threshold: ~0.02 below `p05` of the source's complexity tier (see `eval.md`'s validated thresholds table). If the diff fails, run [`scripts/frame_strip.sh`](scripts/frame_strip.sh) to see _which_ frames diverged, then re-read the relevant timing/sequencing/media reference. **Critical**: both renders must use matching pixel format. Set `Config.setVideoImageFormat("png")` + `Config.setColorSpace("bt709")` in the Remotion source's `remotion.config.ts` — otherwise the diff measures encoder differences (~0.05 SSIM hit), not translation fidelity. ### Step 5: Document gaps Anything that didn't translate cleanly (volume ramps dropped, custom presentations approximated, fonts substituted) gets a `TRANSLATION_NOTES.md` written next to the HF output. See [`references/limitations.md`](references/limitations.md) for the format. ## What this skill explicitly does NOT do - **Translate React state machines.** Compositions that drive animation via `useState` + `useEffect` are not deterministic frame-capture targets in HyperFrames' seek-driven model. Recommend the runtime interop pattern. - **Run Remotion's render pipeline alongside HyperFrames.** That's the runtime interop pattern from [PR #214](https://github.com/heygen-com/hyperframes/pull/214) — a separate solution for compositions that fail this skill's lint. (`@remotion/lambda` is _not_ a blocker — Lambda config is deployment, not animation. The skill drops it as a warning and translates the rest. See [`references/escape-hatch.md`](references/escape-hatch.md).) ## How to grade your own translation Run the test corpus orchestrator: ```bash ./assets/test-corpus/run.sh ``` It runs T1, T2, T3 (render + diff) and T4 (lint validation), prints a per-tier pass/fail table, and emits an aggregate JSON report. Use this to verify the skill is working end-to-end on a clean checkout — and as a regression check after editing any reference. Validated baseline (as of 2026-04-27): | Tier | Composition shape | Mean SSIM | Threshold | | ---- | ------------------------------------------- | --------- | --------- | | T1 | single-element fade-in | 0.974 | 0.95 | | T2 | multi-scene + spring + audio + image | 0.985 | 0.95 | | T3 | data-driven, custom subcomponents, count-up | 0.953 | 0.90 | | T4 | escape-hatch (8 lint cases) | 8/8 pass | n/a |