{
  "synthetic": true,
  "version": "teaching-v1",
  "items": [
    {
      "file": "synthetic-pattern.mp4",
      "duration_seconds": 2,
      "frames": 20,
      "width": 320,
      "height": 180,
      "label": "程序生成测试图形；不是道路或仓储实拍",
      "annotation_example": {
        "frame": 0,
        "tag": "测试图形"
      }
    },
    {
      "file": "synthetic-tone.wav",
      "duration_seconds": 1,
      "sample_rate_hz": 16000,
      "channels": 1,
      "label": "440Hz程序合成提示音；不是音乐家录音或语音"
    }
  ],
  "delivery": "公开教学附件，未经过平台合约授权下载流程；不能作为线上已审核计算的输入证据"
}