fix bug

app.py

@@ -24,18 +24,19 @@ def preprocess_audio(audio_path):
     """Convert audio to mono, 16kHz WAV format suitable for pyannote."""
     try:
         if isinstance(audio_path, str):
-            bytes = False
+            is_bytes = False
         else:
-            bytes = True
+            is_bytes = True
             
         # Load audio with pydub
-        audio = AudioSegment.from_file(BytesIO(audio_path) if bytes else audio_path)
+        audio = AudioSegment.from_file(BytesIO(audio_path) if is_bytes else audio_path)
         # Convert to mono and set sample rate to 16kHz
         audio = audio.set_channels(1).set_frame_rate(16000)
         # Export to temporary WAV file
-        temp_wav = "temp_audio.wav"
-        audio.export(temp_wav, format="wav")
-        return temp_wav
+        buf = BytesIO()
+        audio.export(buf, format="wav")
+        buf.seek(0)
+        return buf
     except Exception as e:
         raise ValueError(f"Error preprocessing audio: {str(e)}")