On Sunday 21 October 2007 22:06, Z F wrote:
> I would like to make a movie with a "chroma key" background and replace
> the background with another movie.
>
> Could some one describe step by step what needs to be done?
>
> I have loaded a movie and attached chroma key effect to it. It appers
> that
> I can make the background black, but how to make a mask out of it? How
> to make the second video track appear in the mask?

You put it in a second video track below it. You need a project format with an 
alpha channel (RGB, YUVA).

-- Hannes

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