Need somebody to develop a scrip to change comp length

[Luca Rechsteiner]

Hello does it exist a script to change comp length depending the length of characters of a text? If I understand right there is no expression that can handle that and I need a script. I would like to know if somebody can help me in developing this.

I would have different compositions with different sentences. I would like the length of the composition be longer with longer texts and shorter with shorter texts. Also I would like to have a fade to black at the beginning/end and also the music to fade out at the end of the comp. Does this make sense? Does somebody I can also pay want to help me developing this script?

Thanks a lot

Luca

[Jace Bradley]

There’s a free script that changes the comp length based on different parameters. The script is called zl.TrimCompToContents

[Andrei Popa]

It’s possible to make the comp length proportionally to the length of a text (I assume you want to count characters). The 2 are also possible, but you need to be more specific. Do you want some layers inside the comp to fade? Or the comp, somewhere where it is used as a layer.

Here is a snippet that modifies the length of the current comp according to the number of characters in the first text layer.

function setCompLength(myComp, framesPerChar) {
  //search first text layer and save character number
  for (var i = 1; i <= myComp.numLayers; i++) {
    var crtLayer = myComp.layer(i);
    if (crtLayer instanceof TextLayer) {
      var numChars = crtLayer.text.sourceText.value.text.length;
      break;
    }
  }
  myComp.duration = framesPerChar * myComp.frameDuration * numChars;
}
setCompLength(app.project.activeItem, 10);

[Luca Rechsteiner]

Hi. First, thanks a lot for your answers. I am really new to scripts so it is very precious!

For length script, where do I manage the length/number of characters? Imagine I want 1 second each 10 characters.

Regarding point 2, I need one or more layers to fade to black so I assume we can play a little with opacity? I also need the music to fade out to silence at the end of the comp…

How to implement this to the script?

Thanks a LOT!!!

[Andrei Popa]

In the last line, 10 is how many frames you want per char. 10 chars for 1 seconds in 30 fps would be 3.

Here are 3 functions that should help you out. You can modify the options object (everything that is between {}) to your needs.

var options = {
    fadeToBlackLayerIndex: 2,
    fadeOutSoundLayerIndex: 4,
    duration: 1,
    comp: app.project.activeItem,
    framesPerChar:3
};
app.beginUndoGroup("modify composition");
setCompLength(options);
fadeToBlack(options);
fadeOutSound(options);
app.endUndoGroup();
function fadeToBlack(options) {
    var comp = options.comp;
    var duration = options.duration;
    var layerIndex = options.fadeToBlackLayerIndex;
    var layer = comp.layer(layerIndex);
    layer.opacity.setValueAtTime(comp.duration - duration, layer.opacity.valueAtTime(comp.duration - duration, false));
    layer.opacity.setValueAtTime(comp.duration, 0);
}
function fadeOutSound(options) {
    var layerIndex = options.fadeOutSoundLayerIndex;
    var comp = options.comp;
    var duration = options.duration;
    var layer = comp.layer(layerIndex);
    layer.audio.audioLevels.setValueAtTime(comp.duration - duration, layer.audio.audioLevels.valueAtTime(comp.duration - duration, false));
    layer.audio.audioLevels.setValueAtTime(comp.duration, [-40, -40]);
}
function setCompLength(options) {
    var myComp = options.comp;
    var framesPerChar = options.framesPerChar;
    //search first text layer and save character number
    for (var i = 1; i <= myComp.numLayers; i++) {
      var crtLayer = myComp.layer(i);
      if (crtLayer instanceof TextLayer) {
        var numChars = crtLayer.text.sourceText.value.text.length;
        break;
      }
    }
    myComp.duration = framesPerChar * myComp.frameDuration * numChars;
  }

[Luca Rechsteiner]

WOW thanks!

[Luca Rechsteiner]

Hello Andrei, I applied just the first scritp and it works but when I applay the second long one I have an error message: that I join to this post. I would like to see if you can help me in developing something, how can I discuss with you? Thanks Luca

Screenshot-2023-01-19-at-20.48.24.png 51 KB Image File — Click to view

• Copy Download Link