{
  "frames": [
    {
      "requested_t": -3.0,
      "actual_t": -3.0
    },
    {
      "requested_t": -0.2,
      "actual_t": -0.1999999999999993
    },
    {
      "requested_t": 0.8,
      "actual_t": 0.8000000000000007
    },
    {
      "requested_t": 2.4,
      "actual_t": 2.4000000000000004
    },
    {
      "requested_t": 5.0,
      "actual_t": 5.0
    },
    {
      "requested_t": 6.8,
      "actual_t": 6.800000000000001
    },
    {
      "requested_t": 8.75,
      "actual_t": 8.75
    },
    {
      "requested_t": 9.36,
      "actual_t": 9.350000000000001
    },
    {
      "requested_t": 9.8,
      "actual_t": 9.8
    }
  ],
  "purpose": "核对STOP入口、后段低速TTC目标对应物与横向交通，不由低TTC认定追尾",
  "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。"
}