You can't improve quality per se. If you've got a bad quality source, there's certain things you can do to tidy up the video - colour correction etc - but essentially encodings more about maximising/preserving the original quality. The easiest way to preserve quality in DVDs is to use high quality encoder.
So, my question is: is your DVD bad quality or do you want to apply effects to make DV video look more like film stock?
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