When exporting to .m4a file, changing quality slider between 10 to 500 has no effect on output file; file has always 196kb/s and the same size.
I use latest stable Audacity version 2.1.3, and ffmpeg 2.2.2 ( F(55.33.100),C(55,52.102),U(52.66.100) ) all extracted from zip.
Except that: Why it is needed ffmpeg2 not ffmpeg3? Why it is needed special version of ffmpeg2 and why this version is so outdated (2.2.2 vs 2.8.13) ?
Newer versions of ffmpeg have fixed many bugs and security vulnerabilities.