ATI's capture software already does de-interlacing of incoming video for playthrough and the video acceleration driver does it for playback. Only one instnec of the overlay supporting adaptive de-interlacing can be active at once though.

If you look on the DScaler site, you will notice they are working on a DirectShow filter. That would be the most appropriate way to use it with ATI's or anyone else's cards for playback. Of course anyone with the necessary video experience and with a DirectShow SDK should be able to make their own filter.

Bruno