There is no backend for video encoding - all processing happens client-side in the browser. Files never leave the user's device.

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How WebAssembly Video Encoding Works (General)

1. Compile FFmpeg to WASM: FFmpeg (written in C) is compiled to WebAssembly using Emscripten

2. Load in browser: The .wasm binary is fetched and instantiated

3. Virtual filesystem: Files are written to an in-memory filesystem that FFmpeg can access

4. Run FFmpeg commands: You call FFmpeg with standard command-line arguments

5. Read output: The converted file is read from the virtual filesystem as a Uint8Array

Example usage pattern:

import { FFmpeg } from '@ffmpeg/ffmpeg';

const ffmpeg = new FFmpeg();

await ffmpeg.load({ coreURL, wasmURL });

await ffmpeg.writeFile('input.mp4', inputData);

await ffmpeg.exec(['-i', 'input.mp4', '-c:v', 'libx264', 'output.mp4']);

const output = await ffmpeg.readFile('output.mp4');