Context:
You have some AAC ADIF files and you want to convert them into MP3 (and the like) format.
Problem:
ffmpeg and libav don’t (and will never) support ADIF AAC files because it is “bad format”.
- see: https://lists.libav.org/pipermail/ffmpeg-user/2010-August/026739.html
- see: http://www.ffmpeg-archive.org/Does-FFMPEG-support-ADIF-AAC-format-td2267738.html
Solution:
You can convert an ADIF AAC files into a ordinary (handled with ffmpeg) .m4a file with this adif2mp4.exe on this page:
https://rtfreesoft.blogspot.jp/2009_10_01_archive.html
If you use Ubuntu Linux 16.04, you can run adif2.exe from Wine 1.6.2 (installed from Ubuntu 16.04 apt repository).
For example, you can convert all *.AAC files in current directory into .m4a format:
$ for i in *.AAC; do wine ../bin/adif2mp4.exe $i `basename $i .AAC`.m4a; done
Once the files are converted to .m4a format, you can handle them with ffmpeg like this:
$ for i in *.m4a; do ffmpeg -i $i `basename $i .m4a`.mp3; done
