{
  "frames": [
    {
      "requested_t": -2.5,
      "actual_t": -2.5
    },
    {
      "requested_t": -1.5,
      "actual_t": -1.5
    },
    {
      "requested_t": -0.2,
      "actual_t": -0.1999999999999993
    },
    {
      "requested_t": 0.8,
      "actual_t": 0.8000000000000007
    },
    {
      "requested_t": 1.5,
      "actual_t": 1.5
    },
    {
      "requested_t": 3.3,
      "actual_t": 3.3000000000000007
    },
    {
      "requested_t": 5.8,
      "actual_t": 5.800000000000001
    },
    {
      "requested_t": 8.6,
      "actual_t": 8.600000000000001
    },
    {
      "requested_t": 9.85,
      "actual_t": 9.850000000000001
    }
  ],
  "purpose": "核对夜间高速分流、首次和后续多次制动的道路背景，不由低概率推断越线",
  "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。"
}