Anyone know of any software that can convert wma files to wav without any loss of quality e.g. loseless conversion?
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Converting a from wma file to wav is technically un-compressing it. You will not be able to regain the quality lost from the original compression, but you shouldn't lose any additional quality as long as the algorithm of the conversion software is decent.
ffmpeg should work well for your needs.
Edit: (Thanks to @evilsoup for the command line given in the comment below)
For converting a directory recursively, you'll want to use find, either with the -exec option, or piping to ffmpeg via xargs. If you want to get fancy, you could install GNU parallel and perform multiple conversions simultaneously. A basic example would be:
See here for some related information.
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WAV is an uncompressed format. Unless you are merging tracks, reducing the sample rate, or lowering the bit depth (all unlikely to happen by accident), a plain conversion to WAV will always be lossless. Of course, this will not remove noise introduced by the lossy compression on the source material. Basically, any program you find will suffice.