Add Sfx

Prerequisites

Sound effects must first be added to the 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:

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

3. Run bun generate.ts to copy it to files/ and regenerate variants.json 4. 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](https://remotion.dev/convert?url=<encoded-sfx-url>)
• 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/rules/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.