{
  "frames": [
    {
      "requested_t": -4.5,
      "actual_t": -4.5
    },
    {
      "requested_t": -3.5,
      "actual_t": -3.5
    },
    {
      "requested_t": -2.9,
      "actual_t": -2.9000000000000004
    },
    {
      "requested_t": -2.5,
      "actual_t": -2.5
    },
    {
      "requested_t": -1.9,
      "actual_t": -1.9000000000000004
    },
    {
      "requested_t": -0.5,
      "actual_t": -0.5
    },
    {
      "requested_t": 1.6,
      "actual_t": 1.5999999999999996
    },
    {
      "requested_t": 2.35,
      "actual_t": 2.3499999999999996
    },
    {
      "requested_t": 3.5,
      "actual_t": 3.5
    }
  ],
  "purpose": "核对左侧蓝车、本车进入左转车道、事前单点低时距及事后低速刹停；不预设蓝车强行切入",
  "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。"
}