{
  "frames": [
    {
      "requested_t": -2.0,
      "actual_t": -2.0
    },
    {
      "requested_t": -1.0,
      "actual_t": -1.0
    },
    {
      "requested_t": -0.05,
      "actual_t": -0.05000000000000071
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 0.25,
      "actual_t": 0.25
    },
    {
      "requested_t": 1.0,
      "actual_t": 1.0
    },
    {
      "requested_t": 2.25,
      "actual_t": 2.25
    },
    {
      "requested_t": 3.0,
      "actual_t": 3.0
    },
    {
      "requested_t": 7.0,
      "actual_t": 7.0
    }
  ],
  "purpose": "核查红灯队列、刹车起点、低TTC及近停时横向关闭",
  "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。"
}