title: windows SOX MP4/FFMPEG support
body: <p>i'm trying to use SOX to cut certain mp3s, convert them to different formats and add fade in-out to the files. </p>
  
  <p>It works fine with mp3 to mp3 but when i try to convert it from an MP3 to an m4r i get the error: "sox FAIL formats: no handler for file extension `m4r'".</p>
  
  <p>I'm using SOX in windows so how can i install the ffmpeg package on top of the SOX so it knows waht to do with the m4r format?</p>
  
  <p>on the same machine i can use ffmpeg to convert from mp3 to m4r just fine. It sucks that ffmpeg doesn't offer FADE for audio.</p>