{
  "frames": [
    {
      "requested_t": -2.0,
      "actual_t": -2.0
    },
    {
      "requested_t": -1.0,
      "actual_t": -1.0
    },
    {
      "requested_t": -0.5,
      "actual_t": -0.5
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 1.0,
      "actual_t": 1.0
    },
    {
      "requested_t": 5.3,
      "actual_t": 5.300000000000001
    },
    {
      "requested_t": 7.2,
      "actual_t": 7.199999999999999
    },
    {
      "requested_t": 9.0,
      "actual_t": 9.0
    },
    {
      "requested_t": 9.8,
      "actual_t": 9.8
    }
  ],
  "purpose": "核对夜间弯路跟车与STOP路口，区分锚点退出、后给油与后段刹车",
  "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。"
}