ffmpeg -i "ep1.m4a" -i "ep2.m4a" -filter_complex concat=n=2:v=0:a=1 -acodec aac -b:a 64k output.m4b Add a chapter file ( chapters.txt ):
CHAPTER01=00:00:00.000 CHAPTER01NAME=Mountain Retreat CHAPTER02=00:25:00.000 CHAPTER02NAME=Blue Moon ... Then: the joy of painting season 17 m4b
