可以按照以下步骤把想要的录音放在视频里面，只需要下载一个美册视频APP，按照下面的步骤操作就行了。
需要工具：手机、美册视频APP
一、打开手机里美册视频APP，进入主界面。
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二、点击下面的制作。
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https://iknow-pic.cdn.bcebos.com/242dd42a2834349b00801803c7ea15ce37d3beb5"/>
三、点击进入之后，选择文字视频。
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四、先选择时间，然后你可以自己说一段录音。
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https://iknow-pic.cdn.bcebos.com/314e251f95cad1c8cb5af6a1713e6709c83d5156"/>
五、因为时间关系，我这里选择的是导入本地音频。
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https://iknow-pic.cdn.bcebos.com/3ac79f3df8dcd100cc7df2a77c8b4710b8122f56"/>
六、然后选择视频提取音频。
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https://iknow-pic.cdn.bcebos.com/9345d688d43f8794271e42a8dc1b0ef41ad53a56"/>
七、选择一个需要提取音频的视频，点击确定。
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https://iknow-pic.cdn.bcebos.com/3c6d55fbb2fb43168bab0cfc2ea4462308f7d384"/>
八、调整好时间，然后点击右上角的“√”标志。
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https://iknow-pic.cdn.bcebos.com/9f510fb30f2442a74efd8b23df43ad4bd0130240"/>
九、这里还需要确定选择。
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十、完成之后就显示文字，说明已经成功提取了视频中的音频，然后点击视频背景。
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https://iknow-pic.cdn.bcebos.com/55e736d12f2eb938ad5e7074db628535e5dd6f00"/>
十一、可以在软件里面选择动态背景，也可以选择本地视频。
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https://iknow-pic.cdn.bcebos.com/8718367adab44aed90fac862bd1c8701a08bfb84"/>
十二、选择一个比较适合的视频，点击确定。
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https://iknow-pic.cdn.bcebos.com/d009b3de9c82d1589b712f378e0a19d8bd3e4240"/>
十三、调整视频的时间，然后点击“√”。
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十四、返回看看效果，录音视频文字已经保存好了，然后再次点击左上角的“√”标志。
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https://iknow-pic.cdn.bcebos.com/b90e7bec54e736d11b20868e95504fc2d5626900"/>
十五、这里就显示正在合成，合成过程中不能返回。
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https://iknow-pic.cdn.bcebos.com/a2cc7cd98d1001e9170f1e89b60e7bec54e79700"/>
十六、录音和视频合成之后可以选择分享或者保存本地，那这就完成了。
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