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              "webCommandMetadata": {
               "ignoreNavigation": true
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             },
             "liveChatItemContextMenuEndpoint": {
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            },
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            "timestampUsec": 0,
            "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
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             "accessibilityData": {
              "label": "コメントの操作"
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            },
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             "simpleText": "0:00"
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           }
          },
          "clientId": "dummy_client_id"
         }
        }
       ],
       "videoOffsetTimeMsec": "24500"
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     },
     {
      "replayChatItemAction": {
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        {
         "addChatItemAction": {
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             "runs": [
              {
               "text": "dummy_message"
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               "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
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              "webCommandMetadata": {
               "ignoreNavigation": true
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             },
             "liveChatItemContextMenuEndpoint": {
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             }
            },
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            "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
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             "accessibilityData": {
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             "simpleText": "0:00"
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           }
          },
          "clientId": "dummy_client_id"
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        }
       ],
       "videoOffsetTimeMsec": "24600"
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     },
     {
      "replayChatItemAction": {
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        {
         "addChatItemAction": {
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              {
               "text": "dummy_message"
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               "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
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              "webCommandMetadata": {
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             },
             "liveChatItemContextMenuEndpoint": {
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            },
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            "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
            "contextMenuAccessibility": {
             "accessibilityData": {
              "label": "コメントの操作"
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            },
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             "simpleText": "0:00"
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           }
          },
          "clientId": "dummy_client_id"
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        }
       ],
       "videoOffsetTimeMsec": "24700"
      }
     },
     {
      "replayChatItemAction": {
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        {
         "addChatItemAction": {
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              {
               "text": "dummy_message"
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             ]
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              "webCommandMetadata": {
               "ignoreNavigation": true
              }
             },
             "liveChatItemContextMenuEndpoint": {
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             }
            },
            "id": "dummy_id",
            "timestampUsec": 0,
            "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
            "contextMenuAccessibility": {
             "accessibilityData": {
              "label": "コメントの操作"
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            },
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             "simpleText": "0:00"
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           }
          },
          "clientId": "dummy_client_id"
         }
        }
       ],
       "videoOffsetTimeMsec": "24800"
      }
     },
     {
      "replayChatItemAction": {
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        {
         "addChatItemAction": {
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              {
               "text": "dummy_message"
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               "url": "https://yt3.ggpht.com/------------/AAAAAAAAAAA/AAAAAAAAAAA/xxxxxxxxxxxx/s32-x-x-xx-xx-xx-c0xffffff/photo.jpg",
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             ]
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              "webCommandMetadata": {
               "ignoreNavigation": true
              }
             },
             "liveChatItemContextMenuEndpoint": {
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             }
            },
            "id": "dummy_id",
            "timestampUsec": 0,
            "authorExternalChannelId": "http://www.youtube.com/channel/author_channel_url",
            "contextMenuAccessibility": {
             "accessibilityData": {
              "label": "コメントの操作"
             }
            },
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             "simpleText": "0:00"
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           }
          },
          "clientId": "dummy_client_id"
         }
        }
       ],
       "videoOffsetTimeMsec": "25000"
      }
     }
    ]
   }
  }
 }
}