{
  "id": "C05-N04",
  "title": "透明视频边缘一圈黑，怎样核对 Alpha 的解释方式",
  "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": "透明渐变与细线样片在两种背景上的对照截图",
  "input": {
    "foreground_rgba": [
      255,
      0,
      0,
      128
    ],
    "background_rgb": [
      255,
      255,
      255
    ]
  },
  "expected": {
    "straight_over_white_rgb": [
      255,
      127,
      127
    ]
  },
  "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": [
    "asset_hash",
    "alpha_representation",
    "background_rgb",
    "scale",
    "player_version",
    "edge_observation",
    "screenshot_id"
  ]
}