这应该意味着，除非用户切换选项卡，否则不会看到乱七八糟的FFMPEG输出。
This should mean that the user doesn't have to see the mess of FFMPEG output unless they switch tabs.
place_tab _ buttons函数创建有着选项卡名称的锚定标记，单击锚定标记时，将切换选项卡。
The place_tab_buttons function creates anchor tags that have the name of the TAB and that switch tabs when clicked.
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