Update app.py

app.py

@@ -170,7 +170,7 @@ def make_video(video_path, outdir='./vis_video_depth', encoder='vits'):
             
             cv2.imwrite(f"f{count}_dmap.png", depth_color)
             depth_frames.append(f"f{count}_dmap.png")
-            masks.append(depth_color)
+            masks.append(depth_color.copy())
             count += 1
 
         final_vid = create_video(depth_frames, frame_rate, "depth")