How to generate the aar file for this lib?

[ssaguiar]

I am able to use these scripts to generate the libs but, in your FFmpeg Android Java you use a .aar file.
I already made the changes to use the ndk 11 and android ver 16 and it compiles fine (it generates the build folder).
How can I generate the .aar file, from the compiled result?
I want to understand and learn how to do it.

Thanks and congratulations for the scripts.