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Something happened when I converted Mp3 to Wav.

The music lost quality, how can I get back Mp3 Quality with ffmpeg or anytools using command line?

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    you really need to edit your question to at least include the command string you used with ffmpeg , when you experierienced the problem.
    – Psycogeek
    Sep 20, 2015 at 18:12

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I don't really understand the question, but David's edit helped.

Did you lose the original MP3 and now you only have the Wav file, and you want to get back the "quality" you had in the MP3?

Unlike MP3, Wav is a lossless format, so sound quality should not have been lost in decoding MP3 to Wav. (Not sure why you'd want that anyway in many cases, as that will greatly increase the file size and not increase the quality.)
On the other hand information will be lost if you encode it back to MP3 from Wav, but you can of course try it, and see how it works for you.

What about simply ffmpeg -i file.wav -q:a 0 file.mp3?

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