sync markers from precpmp to parent timeline

You can use this script to copy comp markers to another composition.

sync_markers.jsx

(function(thisObj) {

  buildUI(thisObj);

  function buildUI(thisObj) {
    var palette = (thisObj instanceof Panel) ? thisObj : new Window("palette", "Sync Markers", undefined, {
      resizeable: true
    });
    palette.orientation = 'column';
    palette.alignfromren = ['fill', 'top'];
    palette.spacing = 7;
    palette.margins = 10;
    palette.add("statictext", undefined, 'FROM COMP:');
    var items = [];
    var project = app.project;
    if (project && project.items.length > 0) {
      for (var i = 1; i <= project.items.length; i++) {
        var item = project.items[i];
        if (item instanceof CompItem) {
          items.push(item.name);
        }
      }
    }
    var fromCompDropdown = palette.add('dropdownlist', undefined, items);
    fromCompDropdown.selection = 0;
    palette.add("statictext", undefined, 'TO COMP:');
    var toCompDropdown = palette.add('dropdownlist', undefined, items);
    toCompDropdown.selection = 1;
    var syncButton = palette.add('button', undefined, 'SYNC MARKERS');
    syncButton.onClick = syncMarkers;

    if (palette instanceof Window) {
      palette.center();
      palette.show();
    } else {
      palette.layout.layout(true);
      palette.layout.resize();
    }

    function syncMarkers() {
      var fromCompName = fromCompDropdown.selection ? fromCompDropdown.selection.text : null;
      var toCompName = toCompDropdown.selection ? toCompDropdown.selection.text : null;
      if (fromCompName && toCompName && fromCompName !== toCompName) {
        var project = app.project;
        var fromComp = null;
        var toComp = null;
        for (var i = 1; i <= project.items.length; i++) {
          var item = project.items[i];
          if (item instanceof CompItem) {
            if (item.name === fromCompName) {
              fromComp = item;
            } else if (item.name === toCompName) {
              toComp = item;
            }
          }
        }

        if (fromComp && toComp) {
          while (toComp.markerProperty.numKeys) {
            toComp.markerProperty.removeKey(1)
          }
          app.beginUndoGroup("Copy Comp Markers");
          for (var j = 1; j <= fromComp.markerProperty.numKeys; j++) {
            var marker = new MarkerValue(fromComp.markerProperty.keyValue(j).comment);
            marker.chapter = fromComp.markerProperty.keyValue(j).chapter;
            marker.comment = fromComp.markerProperty.keyValue(j).comment;
            marker.cuePointName = fromComp.markerProperty.keyValue(j).cuePointName;
            marker.duration = fromComp.markerProperty.keyValue(j).duration;
            marker.eventCuePoint = fromComp.markerProperty.keyValue(j).eventCuePoint;
            marker.frameTarget = fromComp.markerProperty.keyValue(j).frameTarget;
            marker.url = fromComp.markerProperty.keyValue(j).url;
            marker.label = fromComp.markerProperty.keyValue(j).label;
            marker.protectedRegion = fromComp.markerProperty.keyValue(j).protectedRegion;
            toComp.markerProperty.setValueAtTime(fromComp.markerProperty.keyTime(j), marker);
          }
          app.endUndoGroup();
        }
      } else {
        alert('Please select two different compositions.');
      }
    }
  }
})(this);