This an example on converting audio file from wav format to mp3 with the help of Sound eXchange( a.k.a SOX ), and Lame Aint an MP3 Encoder (a.k.a. Lame). Before using this script, please make sure you have both sox and lame installed. (function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; [...]