Each message in the chat replay will be grouped into segments of 30 seconds, and a bar chart will be displayed above the progress bar. After loading the live stream file on the webpage, you will need to wait for a while before the chart can be generated. 將聊天室重播中每個訊息以30秒為一組，並且會製成一個長條圖顯示在進度調上方 在載入直播檔的網頁後，需要等待一段時間才可以生成圖表
