Alternative solution:
I use:
http://www.tucows.com/preview/194683.htmlPolderbitS Sound Recorder and Editor
to rerecord and edit sound that has formatting that does not allow me to convert normally. (You can do this digitally or with microphone close to speaker) I was able to convert old Russian WW2 folk songs this way.
Only converts mp3 to wav and vice versa.
Then you could try converting the wav file to ogg or wss; however you do that normally.
I'm only suggesting this as it's a very fast way for me to get around this kind of problem.
Has always worked for me. No exceptions.
I might add, I have a license for those Russian sound files --->