Cropping to Visible Alpha of Multiple Frames

Hi All,
I have set up some footage that has had its background removed via chroma key and I have added a drop shadow on the resultant 'cut out' footage. Now I want to crop the frame so that the minimum area that is needed to contain the footage and the drop shadow can be output with an alpha channel - ie any areas that are fully transparent on ALL the frames is cropped away.
There is a method in Photoshop where Cmd/Ctrl clicking on a layer selects the transparency of that layer which can then be cropped, removing all the invisible area that surrounds the image and contains no image data. Is there a way to do this in AE for multiple frames, without going through the nigh-impossible task of trying to estimate the area needed for a moving image that has a soft and transparent shadow without cropping the edges of the image off?
Once I have got the area I need, how would I go about applying the crop?
I'm new to AE, so I may be asking the impossible, but any advice would be greatly appreciated!

but I doubt PS would allow import of 5000 frames to corresponding layers.
Why not? People have doen crazier things and the Frames to Layers script should not care. It may just take a while. If all else fails, you can always try in multiple chunks in multiple documents and manually merge them later....
If the method you suggest is intended to work within AE, can you be more specific please?
Region of Interest
If this is for one of those notorious transparent website overlays, you would still have a specific size requirement due to how it is embedded and keeping it "tight" is probably wasted effort, even more so as it only has minor impact on compression, anyways.
Mylenium

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