问题
Is is there some sort of library that would allow me to convert a speex file to an mp3 file? If it were do-able from php that would be even better, but really anything would probably work.
回答1:
If you have gstreamer available on your platform, it can do it for you provided you have the proper codecs installed.
On http://forums.fedoraforum.org/showthread.php?t=61984 I found this piece of code for wma to mp3 conversion, you should be able to craft something similar for your needs:
gst-launch filesrc location=filename.wma ! spider ! lame ! filesink location=filename.mp3
来源：https://stackoverflow.com/questions/306622/convert-speex-files-to-mp3-programatically