converts speex (spx) audio format to mp3 or other common audio format.
Having a slow connection I would like to try and save bandwidth by downloading audio books in speex format as they are a much smaller file size. The only programs that I have come across are shareware or commercial to convert spx to mp3. Does anyone know of a free / open source program??

I like Format Factory.
A few thoughts...
I haven't tested it but this sounds like it should work:
Ogg Media Creator lets you convert between Ogg Speex and Wave PCM.
Then use a tool like SUPER to convert to your favorite audio format.
The 3CX Phone System may also be worth looking into to see if it can do what you want.
Another possibility is asking for help in the http://www.xiph.org/ forum.
I'm not aware of any freeware program that will handle this conversion. However if you go the SPX site you can find on their software page some of the plug-ins that have been written for SPX. I see there is one for WinAmp and that might be worth investigating.
http://www.speex.org/software/
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