"Extra quality" in this context usually refers to high-efficiency video coding (like x264 or x265) which provides excellent picture quality even at lower resolutions compared to standard rips.
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Why 480p Xtra Quality?
If you want true, uncompressed 480p video quality that doesn't rely on an internet connection, picking up the official DVD Box Set of House M.D.: The Complete Series remains an excellent investment for collectors. "Extra quality" in this context usually refers to