Use movie with integrated alpha as mask

Hi!
I don´t know what is the problem... but i have a movie with an integrated alpha layer and i want to use it as a mask to cut out something in the layer under it.
For this I use blend mode "silhouette alpha".
It´s possible to stencil the layer under it, but the stenciled area is always black, but it should become transparent.
Please help me
cheers flo

Heya Flo,
You'll have an easier time and more control if you use an Image Mask. Select the object you want to mask and then go to Object->Add Image Mask to apply it. Then you just drag-and-drop any other object into the mask (in the Layers List or the Inspector), and you're good to go.
By default, it uses the alpha of the reference object, but it can use any channel. You also have control over positioning and scaling, which is something that a blend mode can't do.
Good luck with your project!

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<---->
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