WebM → MP4 convert

Studio already includes one-click Download MP4 (see Tools after you stop a recording). Files live under assets/libraries/ffmpeg/ — no CDN.

For your own page you can either:

• Import assets/js/convert-to-mp4.js (same helper Studio uses), or
• Use the FFmpegConvert plugin:

await recorder.use(WebRec.FFmpegConvert({
  coreURL: './assets/libraries/ffmpeg/core/ffmpeg-core.js',
  wasmURL: './assets/libraries/ffmpeg/core/ffmpeg-core.wasm'
}));
const mp4 = await recorder.convert(blob, { outputName: 'out.mp4' });
WebRec.downloadBlob(mp4, 'out.mp4');

First convert loads ~30 MB of WASM — expect a short wait once, then reuse is faster. Docs: Download & MP4 convert.

Open Studio & try Download MP4 Record (core only)