I wanna use a program on an .m4a file, but the program can't handle .m4a. It can handle .aac, however, and the codec of the file is MPEG-4 AAC. Is there a way to convert to .aac (and preferably converting back) without reencoding?
(Alternative solution: does anyone have a good program for lossless splitting of .m4a files? mp3DirectCut kicks ass, but can't handle .m4a.)