{
  "frames": [
    {
      "requested_t": -7.0,
      "actual_t": -7.0
    },
    {
      "requested_t": -5.8,
      "actual_t": -5.8
    },
    {
      "requested_t": -4.5,
      "actual_t": -4.5
    },
    {
      "requested_t": -3.5,
      "actual_t": -3.5
    },
    {
      "requested_t": -2.4,
      "actual_t": -2.4000000000000004
    },
    {
      "requested_t": -1.3,
      "actual_t": -1.3000000000000007
    },
    {
      "requested_t": 0.25,
      "actual_t": 0.25
    },
    {
      "requested_t": 7.5,
      "actual_t": 7.5
    },
    {
      "requested_t": 8.4,
      "actual_t": 8.399999999999999
    }
  ],
  "purpose": "核查让行路口左弯、皮卡车运动、施力与给油先后",
  "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。"
}