FDK AAC encoder supports many different AAC profiles and is considered to be one of the best AAC encoders there are, and certainly the best and most feature-complete AAC encoder supported by FFmpeg. It is originally from the Android Open Source Project (AOSP) as the standard AAC encoder in the Android platform, but it is packaged into a form suitable for system-wide installation as well.

In order to quickly compile your libfdk-aac library, you can type the following commands in your shell:

# apt-get install pkg-config autoconf automake libtool
$ git clone https://github.com/mstorsjo/fdk-aac.git
$ cd fdk-aac
$ ./autogen.sh
$ ./configure --enable-shared --enable-static
$ make
# make install
# ldconfig

NOTE: You won't be able to build GPL-licensed FFmpeg with libfdk-aac. If you do, your FFmpeg will not be redistributable.