{
  "topic": "C21",
  "title": "AI 视频字幕漂移修复：按真实时间戳修复字幕漂移，保住音频时长",
  "scope": "实际VFR/CFR MP4、独立逐帧PTS、三处音画事件和SRT；转码已完整解码检查。",
  "targetTool": "FFmpeg",
  "targetServiceExecution": "Not performed; actual local native operations are described separately.",
  "files": [
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      "file": "README.md",
      "sha256": "a73b738ca47baaf9e00662fa2de6675265f79b241df5122a64661cf960a192e4",
      "bytes": 1347,
      "role": "instructions-or-unfilled-check-template"
    },
    {
      "file": "checks.csv",
      "sha256": "44db876b9165074f1881d5866256b66534f512096aa1ee414c21bf816b170c74",
      "bytes": 265,
      "role": "instructions-or-unfilled-check-template"
    },
    {
      "file": "convert-cfr.sh",
      "sha256": "4d574e6e7037a0bbfba2ad03268eda34f9efcf6d5fbed1362e72508e7fd610eb",
      "bytes": 132,
      "role": "author-native-input-or-reference"
    },
    {
      "file": "native-cfr-reference.mp4",
      "sha256": "129390139a6d3d7f52b9269eacb9b9dc3b17340baf0376f26cfbf1b8fec6c497",
      "bytes": 130960,
      "role": "author-native-input-or-reference"
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    {
      "file": "native-cfr-reference.mp4.pts.csv",
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      "bytes": 1325,
      "role": "author-native-input-or-reference"
    },
    {
      "file": "native-variable-pts-input.mp4",
      "sha256": "9d4824f1fc6f529b1581013b9fb381bbd4056c7ceace324b62e903da3e341ac1",
      "bytes": 126693,
      "role": "author-native-input-or-reference"
    },
    {
      "file": "native-variable-pts-input.mp4.pts.csv",
      "sha256": "298c34f1f819f581869b759bc4bd28d400aad34025cd839176dcc0f5c0db686d",
      "bytes": 572,
      "role": "author-native-input-or-reference"
    },
    {
      "file": "sync-events.srt",
      "sha256": "ac01058966126015a41108aadfbeecd6bea3ac469ff45d67444334ff5ba9ed2d",
      "bytes": 122,
      "role": "author-native-input-or-reference"
    },
    {
      "file": "sync-events.wav",
      "sha256": "5f774e45885fd951f2793f5ca8ea539edb21c47c460a32ce9e6eada83b723699",
      "bytes": 216044,
      "role": "author-native-input-or-reference"
    }
  ],
  "localExecution": "Actual native SDK/media operations are included; read file roles and reports."
}