I've just edited my first HD video project (1440 x 1080) and was wondering if anyone had a suggestion as to how to output to an NTSC DV SD format (MP2 for DVD) that will scale the video to 720 x 480 and crop the sides of the video to conform to full screen NTSC (without messing with the aspect) without having to re-edit the whole thing as an NTSC project?