{
  "frames": [
    {
      "requested_t": -7.4,
      "actual_t": -7.4
    },
    {
      "requested_t": -1.804,
      "actual_t": -1.8000000000000007
    },
    {
      "requested_t": -1.3,
      "actual_t": -1.3000000000000007
    },
    {
      "requested_t": -0.199,
      "actual_t": -0.1999999999999993
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 1.1,
      "actual_t": 1.0999999999999996
    },
    {
      "requested_t": 3.896,
      "actual_t": 3.9000000000000004
    },
    {
      "requested_t": 8.796,
      "actual_t": 8.8
    },
    {
      "requested_t": 9.497,
      "actual_t": 9.5
    }
  ],
  "purpose": "核对积水泥路前静止、短起步再停与横向短暂激活，避免把静止曲率差称为跟踪失控",
  "video_anchor_s": 10.0,
  "note": "使用元数据锚点，不按主观场景判断移动视频；不从未标定画面测算距离或推断路权。"
}