1，电脑打开快剪辑，点击新建视频。
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2，点击本地视频，然后找到这个视频，选择后点击打开。
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3，点击视频右上角的铅笔符号。
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4，把视频的播放速度，调整到1/2x，这样视频播放时间就会比之前的时间多上一倍，操作好了以后，可以自己查看下视频播放效果，确认没问题了，就点击完成。
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https://iknow-pic.cdn.bcebos.com/48540923dd54564e43ba1488bede9c82d0584fa0"/>
5，然后点击编辑声音。
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https://iknow-pic.cdn.bcebos.com/4a36acaf2edda3ccd4274e910ce93901203f9244"/>
6，点击保存导出。
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https://iknow-pic.cdn.bcebos.com/b03533fa828ba61e76ec3b9e4c34970a304e5905"/>
7，点击开始导出，点击下一步。
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https://iknow-pic.cdn.bcebos.com/4afbfbedab64034f5ab731b7a2c379310a551d0c"/>
8，等待视频转换完成后，就可以了。
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