{
  "frames": [
    {
      "requested_t": -7.5,
      "actual_t": -7.5
    },
    {
      "requested_t": -6.0,
      "actual_t": -6.0
    },
    {
      "requested_t": -2.0,
      "actual_t": -2.0
    },
    {
      "requested_t": -0.2,
      "actual_t": -0.1999999999999993
    },
    {
      "requested_t": 1.3,
      "actual_t": 1.3000000000000007
    },
    {
      "requested_t": 2.55,
      "actual_t": 2.5500000000000007
    },
    {
      "requested_t": 5.5,
      "actual_t": 5.5
    },
    {
      "requested_t": 7.8,
      "actual_t": 7.800000000000001
    },
    {
      "requested_t": 9.85,
      "actual_t": 9.850000000000001
    }
  ],
  "purpose": "核对出口至红灯的减速、左转车道变化和最后停车位置，区分提前自动减速与人工补刹",
  "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。"
}