Update app.py

app.py

@@ -4,6 +4,7 @@ import uuid
 from gtts import gTTS
 import whisper
 import openai
+import wave
 
 # Load models once
 # Force whisper to use a writable cache dir
@@ -46,7 +47,17 @@ def generate_feedback_with_llm(transcript):
 
     return response.choices[0].message["content"]
 
+def is_valid_audio(filepath):
+    try:
+        with wave.open(filepath, 'rb') as wf:
+            return wf.getnframes() > 0
+    except Exception:
+        return False
+
 def tutor_feedback(audio_file):
+    if not audio_file or not os.path.exists(audio_file) or not is_valid_audio(audio_file):
+        return "No valid audio received.", "Please record again.", None
+        
     # Step 1: Transcribe
     result = model.transcribe(audio_file)
     transcript = result["text"]