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How does Opus differ from MP3 when comparing both in relation to the file size and quality. For example if I were to convert a 320kbps or 128kbps file that is 10MB or 4MB in mp3 format to opus, what will I get?

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Converting one lossy format to another one is always bad, you should only ever do this only when you need to strongly reduce the file size or the original format is incompatible with what you'd like to use it for. –  leftaroundabout Nov 2 '12 at 18:42
@leftaroundabout - Hi buddy, care to explain in detail in an answer, also adding to it the difference between both and an hypothetical output if i tried converting them? –  Luis Alvarado Nov 2 '12 at 20:00
Luis, @left is referring to generation loss - though you probably wouldn't incur any noticeable quality loss, just converting the once, with high-quality MP3s. 128kb/s MP3s might be another story, though... –  evilsoup Feb 2 '13 at 19:52

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