{
  "responseContext": {
    "webResponseContextExtensionData": ""
  },
  "continuationContents": {
    "liveChatContinuation": {
      "continuations": [
        {
          "invalidationContinuationData": {
            "invalidationId": {
              "objectSource": 1000,
              "objectId": "___objectId___",
              "topic": "chat~00000000000~0000000",
              "subscribeToGcmTopics": true,
              "protoCreationTimestampMs": "1577804400000"
            },
            "timeoutMs": 10000,
            "continuation": "___continuation___"
          }
        }
      ],
      "actions": [
        {
          "replayChatItemAction": {
            "actions": [
              {
                "addChatItemAction": {
                  "item": {
                    "liveChatTextMessageRenderer": {
                      "message": {
                        "runs": [
                          {
                            "text": "dummy_message"
                          }
                        ]
                      },
                      "authorName": {
                        "simpleText": "author_name"
                      },
                      "authorPhoto": {
                        "thumbnails": [
                          {
                            "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
                            "width": 32,
                            "height": 32
                          },
                          {
                            "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
                            "width": 64,
                            "height": 64
                          }
                        ]
                      },
                      "contextMenuEndpoint": {
                        "commandMetadata": {
                          "webCommandMetadata": {
                            "ignoreNavigation": true
                          }
                        },
                        "liveChatItemContextMenuEndpoint": {
                          "params": "___params___"
                        }
                      },
                      "id": "dummy_id",
                      "timestampUsec": 0,
                      "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
                      "contextMenuAccessibility": {
                        "accessibilityData": {
                          "label": "コメントの操作"
                        }
                      },
                      "timestampText": {
                        "simpleText": "0:00"
                      }
                    }
                  },
                  "clientId": "dummy_client_id"
                }
              }
            ],
            "videoOffsetTimeMsec": "10000"
          }
        }
      ]
    }
  }
}