Update app.py

app.py

@@ -13,7 +13,7 @@ def fonk(video_path):
   frame_height = int(cap.get(4))
   size = (frame_width, frame_height)
   output_video = cv2.VideoWriter('filename.mp4',  
-                         cv2.VideoWriter_fourcc(*'XVID'), 
+                         cv2.VideoWriter_fourcc('X', 'V', 'I', 'D'), 
                          10, size)