comparison
Does what it says. I was using Final Vinyl to manually convert from aiff to m4a, which did a 10x reduction in disk space using AAC, mpeg-4 sdsm, mpeg-4 odsm. This app converted to m4a with only a 2x reduction in disk space. So, to get what I wanted, I had to convert to mp4, then from mp4 to m4a. But since its automated, I could do a whole directory, then come back later and do it again. Saved me a lot of time over manually converting lots of files.
BAudioVideo7777 about SoundConverter