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How can I convert mp3 files to 3gp files that use the AMR-WB+ codec?

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You are planning to convert from lossy to lossy - you are loosing quality! Best to get hold of the original uncompressed/modified form then convert straight to 3gp for best possible quality. – Aaron Aug 9 '09 at 23:12
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At the very least, choose a higher bitrate on the target format than the mp3 was. That will help minimize the overall quality loss from transcoding. – Michael Kohne Aug 10 '09 at 3:06
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I'm planning on converting audio books so quality isn't that big an issue. – Jared Aug 10 '09 at 12:00

I think XviD4PSP would be useful.
The MediaCoder Audio Edition might also work, it could be a little tricky to handle.

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