{
  "frames": [
    {
      "requested_t": -3.0,
      "actual_t": -3.0
    },
    {
      "requested_t": -1.0,
      "actual_t": -1.0
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 1.0,
      "actual_t": 1.0
    },
    {
      "requested_t": 2.4,
      "actual_t": 2.4000000000000004
    },
    {
      "requested_t": 3.2,
      "actual_t": 3.1999999999999993
    },
    {
      "requested_t": 5.0,
      "actual_t": 5.0
    },
    {
      "requested_t": 6.5,
      "actual_t": 6.5
    },
    {
      "requested_t": 8.5,
      "actual_t": 8.5
    }
  ],
  "purpose": "核查左转进入停车区与车速、施力及横向标志切换",
  "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。"
}