Update app.py

app.py

@@ -408,7 +408,7 @@ def denoise(input_files):
 
         name1 = video_file.name
         file_name_with_extension = name1.split('/')[-1]
-        file_name1 = file_name_with_extension.split('.mp4')[0] + ".wav"
+        file_name1 = file_name_with_extension.split('.mp4')[0] + ".mp4"
 
         save_file_with_new_name(video_file.name, file_name1)