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Audio Auto Fade Out

New Here ,
Jul 06, 2023 Jul 06, 2023

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将音频文件导入After Effects,将其添加到你的合成中。
选中音频图层,在时间线中展开“音频”属性,然后展开“波形”属性。
按住Alt/Option键,单击音量属性旁边的停止表达式按钮。这将允许你在音量属性上输入表达式。
在表达式编辑器中输入以下代码:
scss
Copy code
audioDuration = thisLayer.source.duration; // 获取音频图层的总时长
fadeDuration = 1; // 设置淡出时间(1秒)
currentTime = time; // 获取当前时间
startFade = audioDuration - fadeDuration; // 计算淡出开始的时间点

if (currentTime <= startFade) {
value;
} else {
linear(currentTime, startFade, audioDuration, value, 0);
}
这个表达式将检查当前时间是否在淡出开始时间之前。如果是,则音量保持不变。如果当前时间超过淡出开始时间,则音量将在最后1秒内线性减小,直到音频消失。

输入完表达式后,按Enter键确认。现在,当你播放合成时,音频将在最后1秒内逐渐消失。

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New Here ,
Jul 06, 2023 Jul 06, 2023

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This expression does not work in layers

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