{
  "id": "C06-N03",
  "title": "一台播放机晚加入，怎样验收它追到当前节目的位置",
  "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": "不同节目位置加入时的恢复耗时与可见跳变记录",
  "input": {
    "join": 0,
    "first_visible": 2,
    "within_threshold": 2.8,
    "positions": [
      "start",
      "middle",
      "end"
    ]
  },
  "expected": {
    "time_to_first_visible": 2,
    "time_to_threshold": 2.8,
    "product_claim": null
  },
  "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": [
    "trial",
    "join_position",
    "media_cached",
    "join_mono_s",
    "first_visible_mono_s",
    "within_threshold_mono_s",
    "jump_observed",
    "stable_seconds"
  ]
}