Hello Rodolfo,
Forgive me, if this was already answered.
Hi all...
>From mplayer.user mailing list I got no answer...
$ playfile fantasia_a_due-prova_13_agosto.m4a
I use the terminal "play" command, which is part of the sox package. I had managed to configure it for .m4a files, a few years ago under a "varient" of Debian, Ubuntu 14.04. I remember "support libraries" for sox (libsox?) that went by three: Good, Bad and Ugly. Does that ring a bell for anyone? (One of those may even be in "nonfree", due to Apple Licensing issues).
This just came up for me, after I locate an old iTunes library. (Also, I would like to get this Thread back On Topic).
Kenneth Parker