flac格式轉換至mp3

1. sudo apt-get install cuetools shntool flac mac soundconverter

2. ape to flac (according to aidanjm blog):
　　2.1 break ape to flacs: cuebreakpoints sample.cue | shnsplit -o flac sample.flac
　　2.2 copy tags: cuetag sample.cue split-track*.flac

3. Use soundconverter to get from flac to mp3