{
  "frames": [
    {
      "requested_t": -3.5,
      "actual_t": -3.5
    },
    {
      "requested_t": -2.5,
      "actual_t": -2.5
    },
    {
      "requested_t": -1.5,
      "actual_t": -1.5
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 2.0,
      "actual_t": 2.0
    },
    {
      "requested_t": 4.0,
      "actual_t": 4.0
    },
    {
      "requested_t": 6.0,
      "actual_t": 6.0
    },
    {
      "requested_t": 7.0,
      "actual_t": 7.0
    },
    {
      "requested_t": 9.8,
      "actual_t": 9.8
    }
  ],
  "purpose": "核对STOP标志可见时段、减速最低速和后续直行；不从刹车0补写制动机制",
  "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。"
}