add-sfx

Prerequisites

Sound effects must first be added to the [remotion.media](./packages/remotion-media) package. Then it can be deployed using bun run build. The .env may be missing if we are in a worktree, but on the main non-worktree branch it should be present.

The source of truth is generate.ts in that repo. A sound effect must exist there before it can be added to @remotion/sfx.

Sound effects must be:

• WAV format
• CC0 (Creative Commons 0) licensed
• Normalized to peak at -3dB

Steps

1. Add to remotion.media repo (must be done first)

In the remotion-dev/remotion.media repo:

1. Add the WAV file to the root of the repo
2. Add an entry to the soundEffects array in generate.ts:

``ts { fileName: "my-sound.wav", attribution: "Description by Author -- https://source-url -- License: Creative Commons 0", }, ``

1. Run bun generate.ts to copy it to files/ and regenerate variants.json
2. Deploy

2. Add the export to packages/sfx/src/index.ts

Use camelCase for the variable name. Avoid JavaScript reserved words (e.g. use uiSwitch not switch).

export const mySound = 'https://remotion.media/my-sound.wav';

3. Create a doc page at packages/docs/docs/sfx/<name>.mdx

Follow the pattern of existing pages (e.g. whip.mdx). Include:

• Frontmatter with image, title (camelCase export name), crumb: '@remotion/sfx'
• <AvailableFrom> tag with the next release version
• <PlayButton> import and usage
• Description
• Example code using @remotion/media's <Audio> component
• Value section with the URL in a fenced code block
• Duration section (fetch the file and use afinfo on macOS to get duration/format)
• Attribution section with source link and license
• Convert section with a full-link sentence: Open this file on remotion.dev/convert
• See also section linking to related sound effects

4. Register in sidebar and table of contents

• packages/docs/sidebars.ts — add 'sfx/<name>' to the @remotion/sfx category items
• packages/docs/docs/sfx/table-of-contents.tsx — add a <TOCItem> with a <PlayButton size={32}>

5. Regenerate SFX waveforms

After the sound is added to packages/remotion-media and exported from packages/sfx/src/index.ts, regenerate the waveform samples used by the docs:

bun packages/docs/generate-sfx-waveforms.ts

This uses ffmpeg to sample every exported sound effect into around 2000 waveform samples and updates packages/docs/components/sfx-demos/sfx-waveforms.ts.

6. Update the skills rule file

Add the new URL to the list in packages/skills/skills/remotion-markup/sfx.md.

7. Build

cd packages/sfx && bun run make

Naming conventions

Version

Use the current version from packages/core/src/version.ts. For docs <AvailableFrom>, increment the patch version by 1.