{
  "frames": [
    {
      "requested_t": -1.5,
      "actual_t": -1.5
    },
    {
      "requested_t": -1.3,
      "actual_t": -1.3000000000000007
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 2.8,
      "actual_t": 2.8000000000000007
    },
    {
      "requested_t": 3.4,
      "actual_t": 3.4000000000000004
    },
    {
      "requested_t": 3.9,
      "actual_t": 3.9000000000000004
    },
    {
      "requested_t": 5.7,
      "actual_t": 5.699999999999999
    },
    {
      "requested_t": 6.2,
      "actual_t": 6.199999999999999
    },
    {
      "requested_t": 9.8,
      "actual_t": 9.8
    }
  ],
  "purpose": "核对右弯进入环岛、施力和脚刹、低TTC及最低速",
  "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。"
}