https://www.raphael-muench.de/misc/dir2ogg.html

How I convert my music files

dir2ogg converts MP3, M4A, WMA and WAV files to the open-source OGG format.
dir2ogg is a python script that simply binds together mpg123, faad, and oggenc making it easier for the
user to convert his/her music files. OGGs are about 15 to 20 percent smaller than MP3
files, with the same relative audio quality.
apt-get install dir2ogg
dir2ogg -m --delete-input -t -r .


And this code snipplet can be used for renaming all files and folders to lowercase :
find . -depth -exec rename 's/(.*)\/([^\/]*)/$1\/\L$2/' {} \;



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