{
  "kind": "合成输入，非硬件实测",
  "topic": "NDI 非方形像素源铺到画布后变胖，怎样解释 picture_aspect_ratio",
  "data": {
    "xres": 720,
    "yres": 576,
    "dar": [
      16,
      9
    ],
    "target": [
      1280,
      720
    ]
  }
}