You may have to play 4:3 DVDs at 480p to avoid having your display stretch the DVD. Many, maybe most HD displays automatically assume 720p and 1080i signals are formatted for 16:9 so unless your DVD player provides for formating 4:3 correctly on 16:9 displays at HD resolution, you won't want to play 4:3 DVDs at upscaled resolutions.
Chris
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