This was unfortunately not possible with the current nVidia drivers included with the Boot Camp installer for Windows. I´m sure that a future update to the Boot Camp drivers will fix this. The solution for me was to find some alternative drivers from laptopvideo2go.com. Note that all their drivers aren´t compatible with the 9400M GPU, but the one in the link worked like a charm. Happy converting!
Elemental Technologies also makes RapiHD™, a professional solution for accelerated H.264 output from Adobe Premiere® Pro CS4. Trial version of Badaboom can be downloaded from here.
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