{
  "id": "C06-N06",
  "title": "一台机器同时播四路 4K，怎样设计从一到四路的负载实验",
  "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": "固定素材下并发路数、帧时间、CPU GPU 磁盘的阶梯记录",
  "input": {
    "content_fps": 30,
    "levels": [
      {
        "streams": 1,
        "frame_ms": [
          8,
          9,
          10
        ]
      },
      {
        "streams": 2,
        "frame_ms": [
          12,
          14,
          16
        ]
      },
      {
        "streams": 3,
        "frame_ms": [
          18,
          22,
          28
        ]
      },
      {
        "streams": 4,
        "frame_ms": [
          25,
          32,
          40
        ]
      }
    ]
  },
  "expected": {
    "budget_ms": 33.333333333333336,
    "four_stream_max_ms": 40,
    "target_machine_tested": false
  },
  "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": [
    "stream_count",
    "sample_window_s",
    "frame_time_ms",
    "cpu_percent",
    "gpu_engine",
    "gpu_percent",
    "vram_bytes",
    "disk_bytes_s",
    "dropped_frames"
  ]
}