Improve file download handling with streaming and error management

index.js

@@ -66,10 +66,23 @@ app.post("/convert", upload.fields([{ name: "audio" }, { name: "image" }]), asyn
     }
 
     console.log("✅ Conversion complete. Sending file...");
-    res.download(output, () => {
+    res.setHeader('Content-Type', 'video/mp4');
+    res.setHeader('Content-Disposition', `attachment; filename="${output}"`);
+    
+    const stream = fs.createReadStream(output);
+    
+    stream.pipe(res);
+    
+    stream.on('close', () => {
       fs.unlinkSync(audioPath);
       fs.unlinkSync(imagePath);
       fs.unlinkSync(output);
+      console.log("🧹 Cleaned up temp files");
+    });
+    
+    stream.on('error', (err) => {
+      console.error("❌ Stream error:", err);
+      res.status(500).send("Error streaming file.");
     });
   });
 });