transcode.sh: make sure to only take audio
transcode.sh: make sure to only take audio

apparently -vn is kind of broken, also with only -vn we could still grab
a subtitle track if there had been one in the source file

SuperStarPL/eqbeats,codl/eqbeats,SuperStarPL/eqbeats,SuperStarPL/eqbeats,SuperStarPL/eqbeats,eqbeats/eqbeats,eqbeats/eqbeats,codl/eqbeats,eqbeats/eqbeats,codl/eqbeats,codl/eqbeats,codl/eqbeats,SuperStarPL/eqbeats,eqbeats/eqbeats,SuperStarPL/eqbeats,codl/eqbeats,eqbeats/eqbeats,eqbeats/eqbeats