Trim layer to last keyframe

Hi filkinsteez,

the code below should work (havent tested much).

If you are really starting from 0, it might not be easy to understand, but it can give you something to start with.

The difficulty in your problem is to tell the script to visit every property with keys on a layer. This is what the aux function does in the code below.

// aux function to find 1st and last key times on a layer
// group: a property group
// keyTimes : [current first key time, current last key time]
function refineKeyTimes(group, keyTimes){
   
    var n, N=group.numProperties, p;
   
    for (n=1; n<=N; n++){
        p=group.property(n);
        if (p instanceof Property){
            if (p.numKeys>0){
                keyTimes[0] = Math.min(keyTimes[0], p.keyTime(1));
                keyTimes[1] = Math.max(keyTimes[1], p.keyTime(p.numKeys));
                };
            }
        else{
            refineKeyTimes(p, keyTimes);
            };
        };
    return;
    };
       
// main function
function f(){
    var comp = app.project.activeItem;
    if (comp==null || comp.typeName!=="Composition" || comp.selectedLayers.length===0) return; // wrong selection
   
    var sel = comp.selectedLayers;
    var n, N=sel.length, layer;
    var keyTimes;

    for (n=0; n<N; n++){
       
        // start with times that will be overwritten for sure when a key is found
        layer = sel;
        keyTimes= [+1000000, -1000000];
        refineKeyTimes(layer, keyTimes);
       
        // trim if a key was found
        if (keyTimes[1]>-1000000){
            // found a key
            if (keyTimes[1]<layer.outPoint){
                // trim
                layer.outPoint = keyTimes[1] + comp.frameDuration;
                };
            };
        };
    return;
    };

f();

Xavier