{
  "frames": [
    {
      "requested_t": -9.5,
      "actual_t": -9.5
    },
    {
      "requested_t": -8.5,
      "actual_t": -8.5
    },
    {
      "requested_t": -6.5,
      "actual_t": -6.5
    },
    {
      "requested_t": -4.74,
      "actual_t": -4.75
    },
    {
      "requested_t": -2.2,
      "actual_t": -2.2
    },
    {
      "requested_t": -0.85,
      "actual_t": -0.8499999999999996
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 1.4,
      "actual_t": 1.4000000000000004
    },
    {
      "requested_t": 3.0,
      "actual_t": 3.0
    }
  ],
  "purpose": "核对环岛连续人工机动及无退出沿事件标签，前车路径与曲率峰",
  "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。"
}