{
  "frames": [
    {
      "requested_t": -4.2,
      "actual_t": -4.2
    },
    {
      "requested_t": -3.0,
      "actual_t": -3.0
    },
    {
      "requested_t": -1.6,
      "actual_t": -1.5999999999999996
    },
    {
      "requested_t": -0.4,
      "actual_t": -0.40000000000000036
    },
    {
      "requested_t": 0.4,
      "actual_t": 0.40000000000000036
    },
    {
      "requested_t": 0.9,
      "actual_t": 0.9000000000000004
    },
    {
      "requested_t": 1.1,
      "actual_t": 1.0999999999999996
    },
    {
      "requested_t": 8.7,
      "actual_t": 8.7
    },
    {
      "requested_t": 9.7,
      "actual_t": 9.7
    }
  ],
  "purpose": "核对无前车住宅路上的自动减速近停、首次脚刹及后段左转，避免把自动减速归为人工急刹",
  "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。"
}