1、首先点击AE软件界面顶部的【编辑】
2、在界面的左上方点击【编辑】。
3、在打开的菜单栏中选择【模板】中的【输出模块】。
4、在出现的界面中点击【编辑】按钮。
5、随后在【主要选项】的界面中，将格式改为【QuickTime】。
6、随后在页面右下角点击【格式选项】。
7、在视频界面点击【视频编解码器】右侧的下拉箭头。
8、在弹出的菜单栏中选择【H.264】
9、最后选择完后，点击页面下方的【确定】就可以了。
AE视频输出文件大，按照下面的步骤进行转码就行了。
1、选择输出的流码尺寸，720P最好，不需要太大
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2、选择保存的视频格式，高清HD还是高清
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3、格式选择MP4，不要选其他
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4、安装并打开快剪辑软件
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5、打开软件之后，新建项目
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6、从本地导出你的AE视频
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7、直接点击保存导出
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8、在导出这个版块中设置尺寸、帧率、质量等
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9、设置之后，可以直接输出，这样占用内存就小了
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