Update app.py

app.py

@@ -20,7 +20,7 @@ def process_video(
 
     # --- Prepare masked reference ---
     ref_bgr = cv2.cvtColor(ref_img, cv2.COLOR_RGB2BGR)
-    mask_ref, ref_box = get_face_mask_box(ref_bgr, feather_pct, padding_pct)
+    mask_ref, ref_box = ff.get_face_mask_box(ref_bgr, feather_pct, padding_pct)
     if mask_ref is None:
         progress(None)  # hide on error
         return None, None, None, None