Add react-example

apps/react-vite-app/src/App.tsx

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+import { useState, useRef } from "react";
+import { FFmpeg } from "@ffmpeg/ffmpeg";
+import { toBlobURL, fetchFile } from "@ffmpeg/util";
+
+function App() {
+  const [loaded, setLoaded] = useState(false);
+  const ffmpegRef = useRef(new FFmpeg());
+  const videoRef = useRef(null);
+  const messageRef = useRef(null);
+
+  const load = async () => {
+    const baseURL = "https://unpkg.com/@ffmpeg/core@0.12.1/dist/esm";
+    const ffmpeg = ffmpegRef.current;
+    ffmpeg.on("log", ({ message }) => {
+      messageRef.current.innerHTML = message;
+    });
+    // toBlobURL is used to bypass CORS issue, urls with the same
+    // domain can be used directly.
+    await ffmpeg.load({
+      coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, "text/javascript"),
+      wasmURL: await toBlobURL(
+        `${baseURL}/ffmpeg-core.wasm`,
+        "application/wasm"
+      ),
+    });
+    setLoaded(true);
+  };
+
+  const transcode = async () => {
+    const videoURL = "https://ffmpegwasm.netlify.app/video/video-15s.avi";
+    const ffmpeg = ffmpegRef.current;
+    await ffmpeg.writeFile("input.avi", await fetchFile(videoURL));
+    await ffmpeg.exec(["-i", "input.avi", "output.mp4"]);
+    const data = await ffmpeg.readFile("output.mp4");
+    videoRef.current.src = URL.createObjectURL(
+      new Blob([data.buffer], { type: "video/mp4" })
+    );
+  };
+
+  return loaded ? (
+    <>
+      <video ref={videoRef} controls></video>
+      <br />
+      <button onClick={transcode}>Transcode avi to mp4</button>
+      <p ref={messageRef}></p>
+    </>
+  ) : (
+    <button onClick={load}>Load ffmpeg-core</button>
+  );
+}
+
+export default App;

apps/react-vite-app/src/index.css

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+:root {
+  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-text-size-adjust: 100%;
+}
+
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+button {
+  border-radius: 8px;
+  border: 1px solid transparent;
+  padding: 0.6em 1.2em;
+  font-size: 1em;
+  font-weight: 500;
+  font-family: inherit;
+  background-color: #1a1a1a;
+  cursor: pointer;
+  transition: border-color 0.25s;
+}
+button:hover {
+  border-color: #646cff;
+}
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    color: #213547;
+    background-color: #ffffff;
+  }
+  a:hover {
+    color: #747bff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}

apps/react-vite-app/src/main.tsx

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+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App.tsx'
+import './index.css'
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+)

apps/react-vite-app/src/vite-env.d.ts

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+/// <reference types="vite/client" />