{
  "name": "custom-director-layout",
  "sources": [
    {
      "name": "room_src",
      "type": "livekit",
      "config": {
        "serverUrl": "wss://your-project.livekit.cloud",
        "token": "eyJ..."
      }
    }
  ],
  "nodes": [
    {
      "name": "mix_video",
      "type": "video_mixer",
      "inputs": ["room_src"],
      "config": {
        "canvas": { "width": 1920, "height": 1080, "bgColor": "#000000", "coordinateSystem": "ratio" },
        "layout": {
          "mode": "custom",
          "custom": {
            "regions": [
              {
                "name": "speaker",
                "source": { "slot": { "name": "active", "index": 0 } },
                "width": 0.7, "height": 1, "fit": "cover"
              },
              {
                "name": "thumb_1",
                "source": { "slot": { "name": "others", "index": 0 } },
                "offsetX": 0.72, "width": 0.28, "height": 0.33,
                "style": { "borderRadius": 8 }
              },
              {
                "name": "thumb_2",
                "source": { "slot": { "name": "others", "index": 1 } },
                "offsetX": 0.72, "offsetY": 0.34, "width": 0.28, "height": 0.33,
                "style": { "borderRadius": 8 }
              },
              {
                "name": "thumb_3",
                "source": { "slot": { "name": "others", "index": 2 } },
                "offsetX": 0.72, "offsetY": 0.67, "width": 0.28, "height": 0.33,
                "style": { "borderRadius": 8 }
              },
              {
                "name": "logo",
                "source": { "match": { "trackName": "logo-overlay" } },
                "anchor": "top_left", "offsetX": 0.01, "offsetY": 0.02,
                "width": 0.06, "height": 0.04, "zIndex": 100, "fit": "contain"
              }
            ]
          }
        }
      }
    },
    {
      "name": "mix_audio",
      "type": "audio_mixer",
      "inputs": ["room_src"],
      "config": {}
    }
  ],
  "sinks": [
    {
      "name": "rtmp_out",
      "type": "rtmp_push",
      "inputs": ["mix_video", "mix_audio"],
      "config": { "urls": ["rtmp://live.example.com/app/director-key"] }
    }
  ]
}