{
  "frames": [
    {
      "requested_t": -9.2,
      "actual_t": -9.2
    },
    {
      "requested_t": -7.284,
      "actual_t": -7.3
    },
    {
      "requested_t": -3.698,
      "actual_t": -3.7
    },
    {
      "requested_t": -1.9,
      "actual_t": -1.9000000000000004
    },
    {
      "requested_t": -1.784,
      "actual_t": -1.8000000000000007
    },
    {
      "requested_t": -0.8,
      "actual_t": -0.8000000000000007
    },
    {
      "requested_t": -0.599,
      "actual_t": -0.5999999999999996
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 1.3,
      "actual_t": 1.3000000000000007
    }
  ],
  "purpose": "核对跟随前车、横向退出与脚刹、短日志结束处的减速带画面",
  "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。"
}