Update app.py

app.py

@@ -293,9 +293,9 @@ async def generate_tts_optimized(id, lines, lang):
     if output and os.path.exists(audio_path):
         audio = MP3(audio_path)
         duration = audio.info.length
-        
+        return duration, audio_path
     
-    return duration, audio_path
+    return None , None
 
 def audio_func(id, lines, lang):
     """Synchronous wrapper for audio generation."""
@@ -555,7 +555,7 @@ def generate_video():
         if not length or not audio_path:
             print("Failed to generate audio.")
 
-        scale=length/total
+        scale=float(length)/total
         
         # Now proceed with video generation using 'data'
         print(json.dumps(data, indent=2))  # For debugging