stupid and simple racket code to encode mp3 using mplayer and lame
this code convert .wav .ogg .wma files from source-dir to dest-dir in .mp3

Racket >= 6.0
Rackjure install with cmd line raco pkg install rackjure (or use DrRacket graphical installer)
tested on Linux with mplayer and lame installed (don't know for windows)

choose for source-dir and target-dir (default is ".")
recursive source-dir true/false (defaut false)

• get help racket convertmp3.rkt -h
• encode recursive from to racket convertmps3.rkt -r -i myinputdir -o ~/test/mp3