Is it possible to create Composition Markers?

[robtech2000]

Hi all!

I'm doing a Javascript for After effects CS3.
I'm able to add layers and effects.

To access properties of layers:

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app.project.item(1).layer(1).effect("Blur").property("Blur Amount")

And Layer-time markers something like this:

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app.project.item(1).layer(1).marker

But, how can I add composition time markers?
Something like this?

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app.project.item(1).marker

I need to use composition time markers because my script will make a marker,
then the user will align some clips to that marker, and then the script will continue.



Can someone help me pleease.
I'm now trying to find some documentation in the After effects scripting guide.
Any help will be appreciated.
Thanks,
Robin.

[Mylenium]

There's a keyframe to markers script floating around somewhere, maybe this can give you some ideas. I believe comp markers are read-only, though.

Mylenium

[strawdog]

Hi guys,
Bit of a thread resurrection.
Related to the OP, I'm having no joy getting access to the composition markers from within a CS3 script - I would love to know if anyone else has managed to do this ?

It appears that you can query the number of comp markers as an expression:

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thisComp.marker.numKeys

But you can't seem to get access to any of the values ie.

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thisComp.marker.keyValue(1).comment

..doesn't work, which makes me wonder if these markers are even read only to scripts or expressions.

Cheers
Simon

[Paul Tuersley]

You can access the marker info using an expression like:

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thisComp.marker.key(1).comment

So you could probably get a script to read the marker info by adding a temporary text layer and putting an expression in the source text, then read the result of the expression.

The scripting docs say the MarkerValue object represents a layer marker, nothing about comp markers, so I guess you're right that scripts can't access comp markers. But if you made sure all layers were deselected, you could add comp markers using:

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app.executeCommand(app.findMenuCommandId("Add Marker"));

[strawdog]

Neat.
Unlike the OP, I only wanted to read the comments out of the comp markers. I've since given up, and resorted to duping the markers into layers.