{
  "frames": [
    {
      "requested_t": -4.0,
      "actual_t": -4.0
    },
    {
      "requested_t": -2.03,
      "actual_t": -2.05
    },
    {
      "requested_t": -1.7,
      "actual_t": -1.6999999999999993
    },
    {
      "requested_t": -1.0,
      "actual_t": -1.0
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 0.7,
      "actual_t": 0.6999999999999993
    },
    {
      "requested_t": 2.7,
      "actual_t": 2.6999999999999993
    },
    {
      "requested_t": 5.5,
      "actual_t": 5.5
    },
    {
      "requested_t": 9.8,
      "actual_t": 9.8
    }
  ],
  "purpose": "核实右分岔、方向施力与两段脚刹，防止混淆前车离开和后续道路跟车目标",
  "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。"
}