chros, thanks, that worked great too, and I like it more since it got a GUI, which is more user-friendly.
It's a perfect audio-encoding replacement for Foobar2000, except when I re-encode commentary-audio, which I often resample (SSRC) down from 48KHz to 44.1KHz.
Weird though that BatchEncoder creates AAC-files with the extension ".aac", when it's really a ".m4a" file. Foobar2000 told me to rename the .aac file to .m4a
And MediaInfo told me too that the .aac file got a container.
EDIT: Oh, weird, there are 3 modes that the user can output an AAC-file: "AAC: (MPEG-2/AAC) qaac" & "M4A: (MPEG-4/AAC) qaac" & "M4A: (MPEG-2/HE-AAC) qaac".
I didn't knew that QAAC could output to a MPEG-2 file...