Update app.py

app.py

@@ -292,7 +292,12 @@ async def download_audio(request: Request):
         'quiet': True,
         'no_warnings': True,
         'noprogress': True,
-        'cookiefile': cookiefile
+        'cookiefile': cookiefile,
+        'postprocessors': [{
+            'key': 'FFmpegExtractAudio',
+            'preferredcodec': 'mp3',
+            'preferredquality': '192'
+        }]
         
     }