选择一个视频到iMovie剪辑，选中视频的时间轴，点击下方的剪刀标志开始剪辑，剪辑完成导出视频即可。具体步骤如下：
1、选择一个视频，点击更多选项，在菜单中点击用其他应用打开。
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2、在弹出的菜单中，点击拷贝到iMovie剪辑，将视频导入iMovie。
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3、系统会自动启动iMovie，上方为视频浏览窗口，下方为剪辑窗口。
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4、选中视频的时间轴，点击下方的剪刀标志，拖动视频的起点、结尾框，即可调整视频开头和结尾位置。
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5、点击右下角的拆分、分离命令，可以将视频剪断，分别操作两段视频，选中视频段可以进行删除或复制。
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6、完成视频剪辑后，点击左上角的完成，在页面下方点击分享键。
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7、在分享菜单中，点击储存视频，iMovie就会开始导出视频。
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8、iMovie可以有三种视频大小的选择，根据需要，选择导出视频的清晰度即可。导出视频会自动保存到手机相册中。
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注意事项：
1、完成视频片段处理后，点击滤镜选项可选择视频滤镜效果让视频更加有质感。
2、剪辑视频，片段与片段之间可以添加转场效果，使视频衔接更加自然。