{
  "frames": [
    {
      "requested_t": -9.0,
      "actual_t": -9.0
    },
    {
      "requested_t": -7.0,
      "actual_t": -7.0
    },
    {
      "requested_t": -5.2,
      "actual_t": -5.2
    },
    {
      "requested_t": -4.5,
      "actual_t": -4.5
    },
    {
      "requested_t": -3.5,
      "actual_t": -3.5
    },
    {
      "requested_t": -2.5,
      "actual_t": -2.5
    },
    {
      "requested_t": -1.65,
      "actual_t": -1.6500000000000004
    },
    {
      "requested_t": 0.25,
      "actual_t": 0.25
    },
    {
      "requested_t": 8.5,
      "actual_t": 8.5
    }
  ],
  "purpose": "核查停放拖车与会车时间是否早于短暂辅助启用",
  "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。"
}