Set Marker 'Duration' Attribute

Question

Hey there,
I am having serious problems with a seemingly easy task: I want to set the Layer Marker's "Duration" Attribute via ExtendScript. The Scripting Guide tells me two things:
1) There is a setValueAtTime method, which does work with the Marker–Property. But the Duration is not listed unter the MarkerValue parameters! They are (CS6 Scripting Guide page 102):
new MarkerValue(comment, chapter, url, frameTarget, cuePointName, params)
2) But only one page later it tells me that there is a Duration Attribute, which is read/write (CS6 Scripting Guide page 103)
MarkerValue duration attribute
app.project.item(index).layer(index).property("Marker").keyValue(index).duration
Description
The marker’s duration, in seconds. The duration appears in the Timeline panel as a short bar extending from the marker location.
Type
Floating point; read/write.
How the ** can i set this?

Answer 1

I think something like this will work:
var myLayer = app.project.activeItem.layer(1);
var myMarkerVal = new MarkerValue("test comment");
myMarkerVal.duration = 1.5;
myLayer.property("Marker").setValueAtTime(2, myMarkerVal);
Dan