Update app.py

app.py

@@ -234,7 +234,7 @@ def infer_auto(project_name, video_in, subject_to_remove):
       f"--video={video_frames_folder}",
       f"--mask={masks_folder}",
       f"--output={output_folder}",
-      --save_fps=needed_fps
+      f"--save_fps={int(needed_fps)}"
     ]
 
     execute_command(command)