kinetograph-migrate

Migrate a Remotion project to Kinetograph

Most of a Remotion project runs unchanged. remotion and 24 @remotion/* packages are mapped onto Kinetograph's core by the CLI, so the video code does not change. What changes is the tooling around it, and a few packages that have no equivalent. There is no browser anywhere in the render path. Never add one: no Chrome, Puppeteer, Playwright or iframe as a stopgap, for any reason.

Run commands as npx kinetograph <command>. Add --json to get one JSON object. For the other commands and the project API, use the kinetograph skill.

The loop

1. Find the entry and the compositions. Read package.json (scripts, dependencies) and any remotion.config.ts too: doctor only sees files the entry imports, so a player page, a render script or a config file never shows up in its report. Search the project for @remotion/(player|renderer|bundler|lambda|cloudrun|cli|three), from 'three' and IFrame, and treat each hit as a finding. The entry is the file that calls registerRoot (often src/index.ts; package.json scripts or remotion.config.ts name it). Run kinetograph compositions <entry>. If it fails with ... is not supported by Kinetograph yet, that import is the first finding. (The message says to run doctor, but doctor stops on the same import until you fix it.)
2. Doctor. kinetograph doctor <entry> (add --comp <id> for one composition). It reports every element, property and reason the engine cannot draw, with frame ranges. An import that cannot be bundled stops the command before any report, with the package named; fix that first and run doctor again. Keep the report; work from it.
3. Fix each finding. Pick by kind:
   • @remotion/three or three imports: read references/three.md.
   • @remotion/player, @remotion/renderer, @remotion/bundler, @remotion/lambda, @remotion/cloudrun, @remotion/cli, remotion.config.ts, npm run scripts, webpack overrides: read references/tooling.md.
   • IFrame, @remotion/webcodecs, @remotion/media-parser sample callbacks, @remotion/rive, @remotion/skia, Canvas, WebGL or CSS issues in the report: read references/unsupported.md.
   • Anything else: the property or element is named in the report. Change it to one the engine draws, or leave it out. Do not guess; run doctor again.
4. Lint. kinetograph lint <entry> and kinetograph check <entry> (type errors). Fix every error. Errors that say "no declaration file" for react mean @types/react is not installed: add it as a dev dependency at the project's React version and tell the user. That is not a migration problem and does not block render.
5. Look. kinetograph strip <entry> -n 12 -o out/strip.png, then open the PNG. Use still <entry> <frame> for one frame. Compare with what the project was meant to show (a Remotion render, a screenshot, the user's description; if you have none, check against the code and say that you could not compare). doctor and lint can both be clean while text is missing, so check that every title and caption is on screen (see Fonts).
6. Render. kinetograph render <entry> --comp <id> -o out/video.mp4 --strict (--range 0..30 first for a quick test; a..b stops at b-1, a..=b includes b). --strict fails on the first frame with anything unsupported, so no video leaves with something missing.

If --strict still fails after the fixes, a left-over is real. Either approximate it (say how) or remove it, then say so in step 7. Do not hide it by dropping --strict for the final render.

7. Report to the user. List what was ported as is, what was replaced (and with what), what was left out or approximated, and the commands to run the project now. Say plainly when the result differs from Remotion's.

Rules

• A remotion import needs no edit. Do not rewrite remotion or @remotion/* imports to @kinetographdev/core.
• Never remove a feature silently. Every omission or approximation goes in the report from step 7.
• Fonts. Text in a font that is not registered may be drawn as nothing, with no warning from doctor. A fontFamily that names only system fonts (Helvetica, Arial, sans-serif) is the usual cause. Register a font file the user is allowed to use: @remotion/google-fonts/<Family> (loadFont()), registerFont({ family, path: staticFile('F.ttf') }) from @kinetographdev/core, or @font-face { src: url(...) } in an imported .css file. Do not copy system fonts into the project.
• Rendering is a pure function of the frame. Replace Date.now(), Math.random() and timers with frame maths and random(seed).
• There is no network. fetch reads project files only. Copy remote assets into public/ and use staticFile.
• Do not add dependencies for the render path, except kinetograph itself as a dev dependency (it brings @kinetographdev/core, which the 3D elements import from). If it is not on npm yet, ask the user where to install it from. Packages for the studio or tests are fine.

Coverage in one line

Core remotion and these @remotion/* packages are mapped: transitions, motion-blur, noise, paths, shapes, layout-utils, animation-utils, captions, google-fonts, fonts, lottie, gif, media-utils, media, light-leaks, starburst, sfx, zod-types, timeline-utils, media-parser, webcodecs, canvas, rive, skia. Not ported on purpose: three, player, renderer, bundler, cli, lambda, cloudrun, tailwind, tailwind-v4 (Tailwind itself works). The full table is on the docs site at /docs/guides/migrate/. GSAP (core, the free plugins, Flip) works too: seek a paused timeline to frame / fps in a layout effect, or let a gsap.to in a useEffect play by itself (/docs/compat/#gsap).

Needs no rewrite: <Img src> of an .svg file (text inside it is left out), named and functional CSS colours (white, rgb(), oklch()), <TransitionSeries> and <Series> children in a Fragment, <canvas> and <Canvas>, -webkit-text-stroke, and symbols or emoji missing from a font (bundled fallback; CJK needs a font you load). Libraries (Recharts, d3, rough.js, Chart.js, anime.js, Motion, Paper.js) run as they are when they draw from the frame; see /docs/libraries/. Mermaid draws with its default HTML labels (<foreignObject>); load the label font first.