Hot answers tagged after-effects
It's not possible. A generic blur effect relies on a function which smooths out pixel values within a specified radius. A mask combines the value of a pixel in the top layer with the pixel of the layer beneath, modulated by the corresponding alpha value of that pixel in the top layer. So, in short a blur is a 'lateral' function, whereas layer compositing is ...
To directly answer your question, where Rotoscoping is concerned, it is simply the task of masking out, or cutting a hole in a moving image, for every frame. Technically in almost any software capable of Rotoscoping, It is achieved by using a spline connected by a set of points that conforms and deforms each frame in your footage, to match the shape/outline ...
Probably a dumb question, but is your circle the same colour as the rocket? Then it would appear to obscure the rocket... Alternatively - There could be some kind of matte on one of the layers? Click on the Toggle Switches/Modes button at the bottom of the list of layers in the timeline, and see whether any mattes are switched on.
You won't be able to create a clip that can 'blur any layer underneath' when placed in other applications. You can just blur assets from within AE and export them out.
This is not possible, because the blur effect needs the underlying video as input. You can either create the blur effect in Sony Vegas without the need for After Effects, or you can (for more complex effects) import the video into After Effects, add your effects, render the result as video, and import it into Vegas. As you can see the second option takes ...
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