How do I extract a movie frame with applied filters
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So I have a `QTMovieView` displaying a `QTMovie`. Via my interface the user can add and remove CoreImage filters that are applied to the movie in real time. That works fine.

Now I want to extract images from the movie (say when the user hits a button). This works to with the `frameImageAtTime` method. **But what I get is an unfiltered image from the original movie.** My guess is that the CI filters are applied tho the `QTMovieView`'s display layer and not to the movie itself.

Is there a workaround?