MassMp3Joiner this is simple util to recursive find mp3 files in input directory and joined this files to one long mp3 file to output folder.

Using third party tools:

• Mp3Wrap is a free independent alternative to AlbumWrap. It's a command-line utility that wraps quickly two or more mp3 files in one single large playable mp3, without losing filenames and ID3 informations (and without need of decoding/encoding).
• MP3val is a small, high-speed, free software tool for checking MPEG audio files' integrity.

usage: massMp3Joiner
 -c,--chunk-size <arg>   number of mp3 files to join
 -i,--input-dir <arg>    directory to recursive scan
 -mp3val <arg>           path to mp3val util
 -mp3wrap <arg>          path to mp3wrap util
 -o,--output-dir <arg>   directory to write joined mp3 files
 -s,--shuffle            shuffle

NOTE: All mp3 files in output directory will be deleted before start mp3wrap!

./gradlew clean build

After this using zip or tar archives with distribution from build/distributions folder.

./gradlew run

mp3wrap=../utils/mp3wrap-0.5/mp3wrap.exe
mp3val=../utils/mp3val-0.1.8/mp3val.exe
chunk-size=7
shuffle=true
input-dir=C:/Music/input
output-dir=C:/Music/output