Update app.py

app.py

@@ -212,8 +212,8 @@ def add_voice_labelv2(json_file, audio_path):
             end_seconds = (end_time - end_minutes) * 60
             
             data['vocal_times'] = {
-            "start_time": f"{start_minutes}.{start_seconds.2f}",
-            "end_time": f"{end_minutes}.{end_seconds.2f}"
+            "start_time": f"{start_minutes}.{start_seconds:.2f}",
+            "end_time": f"{end_minutes}.{end_seconds:.2f}"
             }
 
             begin_seq = True