diff --git a/js/ffmpeg.js b/js/ffmpeg.js
new file mode 100644
index 0000000..2a280bd
--- /dev/null
+++ b/js/ffmpeg.js
@@ -0,0 +1,96 @@
+class FfmpegError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = 'FfmpegError';
+        this.code = 'FFMPEG_FAILED';
+    }
+}
+
+async function ffmpegWorker(
+    audioBlob,
+    args = {},
+    outputName = 'output',
+    outputMime = 'application/octet-stream',
+    onProgress = null,
+    signal = null
+) {
+    const audioData = await audioBlob.arrayBuffer();
+
+    return new Promise((resolve, reject) => {
+        const worker = new Worker(new URL('./ffmpeg.worker.js', import.meta.url), { type: 'module' });
+
+        // Handle abort signal
+        const abortHandler = () => {
+            worker.terminate();
+            reject(new FfmpegError('FFMPEG aborted'));
+        };
+
+        if (signal) {
+            if (signal.aborted) {
+                abortHandler();
+                return;
+            }
+            signal.addEventListener('abort', abortHandler);
+        }
+
+        worker.onmessage = (e) => {
+            const { type, blob, message, stage, progress } = e.data;
+
+            if (type === 'complete') {
+                if (signal) signal.removeEventListener('abort', abortHandler);
+                worker.terminate();
+                resolve(blob);
+            } else if (type === 'error') {
+                if (signal) signal.removeEventListener('abort', abortHandler);
+                worker.terminate();
+                reject(new FfmpegError(message));
+            } else if (type === 'progress' && onProgress) {
+                onProgress({ stage, message, progress });
+            } else if (type === 'log') {
+                console.log('[FFmpeg]', message);
+            }
+        };
+
+        worker.onerror = (error) => {
+            if (signal) signal.removeEventListener('abort', abortHandler);
+            worker.terminate();
+            reject(new FfmpegError('Worker failed: ' + error.message));
+        };
+
+        // Transfer audio data to worker
+        worker.postMessage(
+            {
+                audioData,
+                ...args,
+                output: {
+                    name: outputName,
+                    mime: outputMime,
+                },
+            },
+            [audioData]
+        );
+    });
+}
+
+export async function ffmpeg(
+    audioBlob,
+    args = {},
+    outputName = 'output',
+    outputMime = 'application/octet-stream',
+    onProgress = null,
+    signal = null
+) {
+    try {
+        // Use Web Worker for non-blocking FFmpeg encoding
+        if (typeof Worker !== 'undefined') {
+            return await ffmpegWorker(audioBlob, args, outputName, outputMime, onProgress, signal);
+        }
+
+        throw new FfmpegError('Web Workers are required for FFMPEG');
+    } catch (error) {
+        console.error('FFMPEG failed:', error);
+        throw error;
+    }
+}
+
+export { FfmpegError };
diff --git a/js/mp3-encoder.worker.js b/js/ffmpeg.worker.js
similarity index 68%
rename from js/mp3-encoder.worker.js
rename to js/ffmpeg.worker.js
index 2a2176c..763388a 100644
--- a/js/mp3-encoder.worker.js
+++ b/js/ffmpeg.worker.js
@@ -36,39 +36,41 @@ async function loadFFmpeg() {
 }
 
 self.onmessage = async (e) => {
-    const { audioData } = e.data;
+    const {
+        audioData,
+        args = [],
+        output = {
+            name: 'output',
+            mime: 'application/octet-stream',
+        },
+        encodeStartMessage = 'Encoding...',
+        encodeEndMessage = 'Finalizing...',
+    } = e.data;
 
     try {
         await loadFFmpeg();
 
-        self.postMessage({ type: 'progress', stage: 'encoding', message: 'Encoding to MP3 320kbps...' });
+        self.postMessage({ type: 'progress', stage: 'encoding', message: encodeStartMessage });
 
         try {
             // Write input file to FFmpeg virtual filesystem
             await ffmpeg.writeFile('input', new Uint8Array(audioData));
 
-            // Encode to MP3 with 320kbps CBR, strip source metadata to avoid duplicate ID3 tags
-            await ffmpeg.exec([
-                '-i',
-                'input',
-                '-map_metadata',
-                '-1',
-                '-c:a',
-                'libmp3lame',
-                '-b:a',
-                '320k',
-                '-ar',
-                '44100',
-                'output.mp3',
-            ]);
+            const ffmpegArgs = ['-i', 'input', ...args, output.name];
 
-            self.postMessage({ type: 'progress', stage: 'finalizing', message: 'Finalizing MP3...' });
+            // Log the exact FFmpeg command being run for debugging.
+            self.postMessage({ type: 'log', message: `Running with args: ${ffmpegArgs.join(' ')}` });
+
+            // Run FFMPEG with the provided arguments.
+            await ffmpeg.exec(ffmpegArgs);
+
+            self.postMessage({ type: 'progress', stage: 'finalizing', message: encodeEndMessage });
 
             // Read output file - use Uint8Array directly to avoid extra bytes from ArrayBuffer
-            const data = await ffmpeg.readFile('output.mp3');
-            const mp3Blob = new Blob([data], { type: 'audio/mpeg' });
+            const data = await ffmpeg.readFile(output.name);
+            const outputBlob = new Blob([data], { type: output.mime });
 
-            self.postMessage({ type: 'complete', blob: mp3Blob });
+            self.postMessage({ type: 'complete', blob: outputBlob });
         } finally {
             // Always cleanup virtual filesystem files
             try {
@@ -77,7 +79,7 @@ self.onmessage = async (e) => {
                 // File may not exist if writeFile failed
             }
             try {
-                await ffmpeg.deleteFile('output.mp3');
+                await ffmpeg.deleteFile(output.name);
             } catch {
                 // File may not exist if exec failed
             }
diff --git a/js/mp3-encoder.js b/js/mp3-encoder.js
index 114f827..6664fb0 100644
--- a/js/mp3-encoder.js
+++ b/js/mp3-encoder.js
@@ -1,3 +1,5 @@
+import { ffmpeg } from './ffmpeg';
+
 class MP3EncodingError extends Error {
     constructor(message) {
         super(message);
@@ -6,71 +8,20 @@ class MP3EncodingError extends Error {
     }
 }
 
-async function encodeToMp3Worker(audioBlob, onProgress = null, signal = null) {
-    const audioData = await audioBlob.arrayBuffer();
-
-    return new Promise((resolve, reject) => {
-        const worker = new Worker(new URL('./mp3-encoder.worker.js', import.meta.url), { type: 'module' });
-
-        // Handle abort signal
-        const abortHandler = () => {
-            worker.terminate();
-            reject(new MP3EncodingError('MP3 encoding aborted'));
-        };
-
-        if (signal) {
-            if (signal.aborted) {
-                abortHandler();
-                return;
-            }
-            signal.addEventListener('abort', abortHandler);
-        }
-
-        worker.onmessage = (e) => {
-            const { type, blob, message, stage, progress } = e.data;
-
-            if (type === 'complete') {
-                if (signal) signal.removeEventListener('abort', abortHandler);
-                worker.terminate();
-                resolve(blob);
-            } else if (type === 'error') {
-                if (signal) signal.removeEventListener('abort', abortHandler);
-                worker.terminate();
-                reject(new MP3EncodingError(message));
-            } else if (type === 'progress' && onProgress) {
-                onProgress({ stage, message, progress });
-            } else if (type === 'log') {
-                console.log('[FFmpeg]', message);
-            }
-        };
-
-        worker.onerror = (error) => {
-            if (signal) signal.removeEventListener('abort', abortHandler);
-            worker.terminate();
-            reject(new MP3EncodingError('Worker failed: ' + error.message));
-        };
-
-        // Transfer audio data to worker
-        worker.postMessage(
-            {
-                audioData,
-            },
-            [audioData]
-        );
-    });
-}
-
 export async function encodeToMp3(audioBlob, onProgress = null, signal = null) {
     try {
         // Use Web Worker for non-blocking FFmpeg encoding
         if (typeof Worker !== 'undefined') {
-            return await encodeToMp3Worker(audioBlob, onProgress, signal);
+            const args = ['-map_metadata', '-1', '-c:a', 'libmp3lame', '-b:a', '320k', '-ar', '44100'];
+
+            return await ffmpeg(audioBlob, { args }, 'output.mp3', 'audio/mpeg', onProgress, signal);
         }
 
         throw new MP3EncodingError('Web Workers are required for MP3 encoding');
     } catch (error) {
         console.error('MP3 encoding failed:', error);
-        throw error;
+
+        throw new MP3EncodingError(error?.message ?? error);
     }
 }