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Adobe After Effects CC 2013 Manual

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duration
comment
chapter
url
frameTarget
eventCuePoint
Return type: Number.
Returns the time of the keyframe.
Return type: Number.
Returns the index of the keyframe.
MarkerKey attributes (expression reference)
You can access values for composition markers and layer markers using the same methods. Access layer markers through the
thisLayer.marker object; access composition markers through the thisComp.marker object.
For the purpose of expressions, markers are a special type of Key object, so you can use methods such as nearestKey(time) to access
markers, and markers also have time and index attributes. The index attribute is not the number (name) of the marker; it is the keyframe index
number, representing the order of the marker in the time ruler.
Expressions have access to all of the values for a marker that you can set in the Composition Marker or Layer Marker dialog box. This expression
on the Source Text property of a text layer displays the time, duration, index, comment (name), chapter, URL, frame target, and cue point name
for the layer marker nearest the current time, and whether the marker is for an event cue point:
m = thisLayer.marker.nearestKey(time);
s = "time:" + timeToCurrentFormat(m.time) + "\r" +
"duration: " + m.duration + "\r" +
"key index: " + m.index + "\r" +
"comment:" + m.comment + "\r" +
"chapter:" + m.chapter + "\r" +
"URL:" + m.url + "\r" +
"frame target: " + m.frameTarget + "\r" +
"cue point name: " + m.cuePointName + "\r" +
"Event cue point? " + m.eventCuePoint + "\r";
for (param in m.parameters){
s += "parameter: " + param + " value: " + m.parameters[param] + "\r";
}
s
Because the XMP metadata in a footage item can be converted into layer markers for a layer based on that item, expressions can interact with
XMP metadata. For information, see XMP metadata in After Effects.
Dan Ebberts provides a tutorial on the After Effects Developer Center that includes an example of using XMP metadata with expressions.
Return type: Number.
Duration, in seconds, of marker.
Return type: String.
Contents of Comment field in marker dialog box.
Return type: String.
Contents of Chapter field in marker dialog box.
Return type: String.
Contents of URL field in marker dialog box.
Return type: String.
Contents of Frame Target field in marker dialog box.
Return type: Boolean.
Setting for cue point type in marker dialog box. True for Event; false for Navigation.
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