{
  "frames": [
    {
      "requested_t": -4.5,
      "actual_t": -4.5
    },
    {
      "requested_t": -3.5,
      "actual_t": -3.5
    },
    {
      "requested_t": -2.5,
      "actual_t": -2.5
    },
    {
      "requested_t": -1.5,
      "actual_t": -1.5
    },
    {
      "requested_t": 0.25,
      "actual_t": 0.25
    },
    {
      "requested_t": 1.25,
      "actual_t": 1.25
    },
    {
      "requested_t": 2.35,
      "actual_t": 2.3499999999999996
    },
    {
      "requested_t": 4.5,
      "actual_t": 4.5
    },
    {
      "requested_t": 8.5,
      "actual_t": 8.5
    }
  ],
  "purpose": "核查排队接近、制动后低TTC、辅助恢复及停车过程",
  "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。"
}