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Welcome to the ffmpeg-windows-build-helpers wiki!

Basically this script exists to make it easy to compile your own ffmpeg that includes high quality but "non gpl compatible" AAC encoders. There are many AAC encoders that FFmpeg has, but many have drawbacks, see http://en.wikipedia.org/wiki/FAAC "alternatives"

Theoretically if you compile a local copy of FFmpeg, then you aren't subject to as many licensing restrictions (ex: gpl) as you otherwise would be, so you can (license-wise) mix in more encoders and use them locally, just not legally redistribute the binary you create. But IANAL.