Given a folder full of 'm4a' files, I can merge them all into one big m4a file using
ffmpeg like so:
ffmpeg -f concat -i <(for f in ./*.m4a; do echo "file '$PWD/$f'"; done) \ -c copy ../OUTPUT.m4a
However, what I would like to do is have
OUTPUT.m4a contain chapters for each one of the original input files (each chapter just needs a number, not a name).
I have tried googling for this, but everything I have found seems to be about merging video files and MKVs, not m4a files.
Ideally, I would like to be able to do this via the command line, as I have 60+ folders, and would like to be able to script this rather than loading it into an app of some sort.
Any help would be appreciated.