Add util and rewrite examples (WIP)

apps/browser/transcode.worker.js

@@ -0,0 +1,24 @@
+importScripts('/dist/ffmpeg.dev.js');
+const ffmpeg = self.FFmpeg.createFFmpeg({log: true});
+
+onmessage = async (event) => {
+    try {
+        const {buffer, name, inType, outType} = event.data;
+        if (!ffmpeg.isLoaded()) {
+            await ffmpeg.load();
+        }
+
+        ffmpeg.FS('writeFile', `${name}.${inType}`, new Uint8Array(buffer));
+        await ffmpeg.run('-i', `${name}.${inType}`, `${name}.${outType}`);
+        const data = ffmpeg.FS('readFile', `${name}.${outType}`);
+
+        postMessage({buffer: data.buffer, type: "result"}, [data.buffer]);
+
+        // delete files from memory
+        ffmpeg.FS('unlink', `${name}.${inType}`);
+        ffmpeg.FS('unlink', `${name}.${outType}`);
+    } catch (e) {
+        postMessage({type: "error", error: e});
+    }
+}
+