{
  "frames": [
    {
      "requested_t": -6.7,
      "actual_t": -6.7
    },
    {
      "requested_t": -5.2,
      "actual_t": -5.2
    },
    {
      "requested_t": -4.9,
      "actual_t": -4.9
    },
    {
      "requested_t": -3.2,
      "actual_t": -3.2
    },
    {
      "requested_t": -1.5,
      "actual_t": -1.5
    },
    {
      "requested_t": -0.3,
      "actual_t": -0.3000000000000007
    },
    {
      "requested_t": 0.0,
      "actual_t": 0.0
    },
    {
      "requested_t": 1.3,
      "actual_t": 1.3000000000000007
    },
    {
      "requested_t": 8.9,
      "actual_t": 8.899999999999999
    }
  ],
  "purpose": "核对路口起步右转、脚刹标志与加速度关系及后续减速",
  "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。"
}