Which is not the default ffmpeg encoder, and due to licensing you can't distribute libfdk_aac and x264 in the same ffmpeg binary. There's a built-in ffmpeg AAC

Which is not the default ffmpeg encoder, and due to licensing you can't distribute libfdk_aac and x264 in the same ffmpeg binary. There's a built-in ffmpeg AAC encoder too, but despite the author's claims it is not as good as libfdk_aac. And libfdk_aac itself isn't as good as Apple's AAC codec either. There's a Hydrogenaudio listening test demonstrating that.