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They are technically 480i, but a properly mastered DVD can flag which frame is complete and which is not, thus progressive scan is easy, if it's film content.
If it's TV show content from old tapes and not film, it won't have those complete flags because it's not film and reverse telecine not easy to do on a cheap player (some can though).
If it's video content though, it just won't have a complete frame unless it's 30fps..
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