Question

任何人都可以帮助我吗？我正在尝试使用Extendscript为后效CC编写脚本。我希望通过javascript更改合成中图层的持续时间。我在这里写了这段代码

app.project.item（1）.layer（1）.length = 12;

或

app.project.item（1）.layer（1）.duration = 12;

但它不起作用。我该怎么做？感谢。

Answer 1

事情并不那么容易。像Solids这样的图层没有您可以设置的持续时间。但您可以设置inPoint和outPoint。像comp这样的其他层需要在源头进行更改。请参阅下面的代码，了解如何执行此操作。

function main(){
// do some checking if we have a comp and a layer selected
var curComp = app.project.activeItem;
  if (!curComp || !(curComp instanceof CompItem)) {
    // alert and end the script
    alert("please select a composition and at least a layer");
    return;
  }
var durationValue = 1; // the desired value in seconds
var selectedLayer = curComp.selectedLayers[0]; 

// if the layer has source layers it is a comp
// so we change its source duration
// else 
// we have layers like solids or lights. They have no source and no layers in them
// so we change their outPoint 

if (selectedLayer.source.numLayers != null){
    $.writeln('we have a comp');
    selectedLayer.source.duration = durationValue;
  } else {
    $.writeln('we have a layer');
    selectedLayer.outPoint =   selectedLayer.inPoint + durationValue;
  }
}
main();

通过后效中的javascript更改合成中图层的持续时间

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