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You can't raise the resolution out of thin air. Information that isn't there in the original data stream isn't there. Period.
DVDs usually are rendered to 720x480 (x576) resolution for NTSC (PAL) markets. Sure, you can scale, interpolate and filter, but the quality never is going to be more than what's on the media.
That actually is one of the most basic rules of information processing:
There is always less information in the processed data than in the original data.
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