{
  "id": "C06-N02",
  "title": "开播同步不代表一小时后同步：怎样画出播放漂移曲线",
  "schema_version": "1.0",
  "evidence_kind": "合成输入与协议；非现场测试结果",
  "tool_versions": {
    "generator": "Python 3.12.4",
    "ffmpeg": "8.0.1（仅实际媒体生成与解码）"
  },
  "required_delivery": "固定测点的多机进度记录、时钟来源和漂移曲线",
  "input": {
    "elapsed_seconds": [
      0,
      1800,
      3600
    ],
    "delta_ms": [
      10,
      22,
      34
    ]
  },
  "expected": {
    "added_drift_ms": [
      0,
      12,
      24
    ],
    "slope_ppm": 6.666666666666667
  },
  "measurement": null,
  "unmeasured": [
    "实体播放硬件",
    "显示刷新相位",
    "现场拍摄",
    "实际Windows目标机配置"
  ],
  "record_fields": [
    "event_id",
    "elapsed_seconds",
    "host",
    "cycle_index",
    "pts_seconds",
    "clock_offset_ms",
    "expanded_progress",
    "delta_ms"
  ]
}