{
  "frames": [
    {
      "requested_t": -9.1,
      "actual_t": -9.1
    },
    {
      "requested_t": -7.4,
      "actual_t": -7.4
    },
    {
      "requested_t": -0.7,
      "actual_t": -0.6999999999999993
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 1.4,
      "actual_t": 1.4000000000000004
    },
    {
      "requested_t": 4.2,
      "actual_t": 4.199999999999999
    },
    {
      "requested_t": 4.8,
      "actual_t": 4.800000000000001
    },
    {
      "requested_t": 5.8,
      "actual_t": 5.800000000000001
    },
    {
      "requested_t": 7.8,
      "actual_t": 7.800000000000001
    }
  ],
  "purpose": "核对住宅道路、转角与画面转向时序、脚刹和控制层级恢复",
  "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。"
}