{
  "id": "C06-N07",
  "title": "节目从视频切到图片时错开，怎样单独测切换同步",
  "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": "视频到图片、图片到视频等四种边界的帧号记录",
  "input": {
    "boundaries": [
      {
        "type": "video-image",
        "a": 10,
        "b": 10.033
      },
      {
        "type": "image-video",
        "a": 20,
        "b": 20.1
      },
      {
        "type": "image-image",
        "a": 30,
        "b": 30
      },
      {
        "type": "video-video",
        "a": 40,
        "b": 40.067
      }
    ]
  },
  "expected": {
    "delta_ms": [
      33,
      100,
      0,
      67
    ]
  },
  "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",
    "boundary_type",
    "cache_state",
    "host",
    "last_old_frame_s",
    "first_new_frame_s",
    "black_interval_ms",
    "readable"
  ]
}