ffmpeg
mac 用 find . -name "*.flac" -exec ffmpeg -i {} -ab 160k -map_metadata 0 -id3v2_version 3 {}.mp3 \;
window用
dir *.flac | foreach {ffmpeg -i $_.FullName -ab 320k -map_metadata 0 -id3v2_version 3 $_.FullName.Replace('flac', 'mp3')}