{
  "frames": [
    {
      "requested_t": -2.5,
      "actual_t": -2.5
    },
    {
      "requested_t": -1.1,
      "actual_t": -1.0999999999999996
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 0.6,
      "actual_t": 0.5999999999999996
    },
    {
      "requested_t": 3.6,
      "actual_t": 3.5999999999999996
    },
    {
      "requested_t": 5.5,
      "actual_t": 5.5
    },
    {
      "requested_t": 6.5,
      "actual_t": 6.5
    },
    {
      "requested_t": 8.5,
      "actual_t": 8.5
    },
    {
      "requested_t": 9.8,
      "actual_t": 9.8
    }
  ],
  "purpose": "核对低速短刹后方向操作、后段画面视角变化与转角证据边界",
  "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。"
}