Nero Aac Encoder is tool developed by Nero for converting the WAV files to MP4 files. The the Installation is very simpler, just look at the following steps.

Code:
# cd /usr/local/src
# wget ftp://ftp6.nero.com/tools/NeroDigitalAudio.zip
# unzip NeroDigitalAudio.zip -d nero
# cd nero/linux
# sudo install -D -m755 neroAacEnc /usr/local/bin
We can test the Installation from the command line
Code:
# neroAacEnc
We will get an output like this
*************************************************************
*                                                           *
*  Nero AAC Encoder                                         *
*  Copyright 2009 Nero AG                                   *
*  All Rights Reserved Worldwide                            *
*                                                           *
*  Package build date: Feb 18 2010                          *
*  Package version:    1.5.4.0                              *
*                                                           *
*  See -help for a complete list of available parameters.   *
*                                                           *
*************************************************************