Convert your audio files with the Nero AAC Codec. Nero AAC Codec (formerly Nero Digital Audio) will help you convert your audio files. The encoder requires .WAV files in PCM wave format as input and provides .MP4 in MPEG-4/3GPP file format as output, as well as quality and bitrate values as parameters. The decoder requires input in MPEG-4/3GPP file format and provides PCM wave files as output.

Nero AAC reference quality MPEG-4 and 3GPP audio codec

Nero AAC Codec (formerly Nero Digital Audio) Features:
1. Compression ratios ranging from Ultra High (58 CDs fit on one.) to High-End Audio (2.5:1), for absolutely perfect audiophile encodings
2. Crystal-clear, award-winning sound quality at every compression ratio and bit rate.
3. Support for embedded album art including covers, booklets, and lyrics
4. Store an entire audio album in a single .mp4 file with all the features of an Audio CD embedded inside, but at a fraction of the space.
5. Reference quality MPEG-4 audio codec
6. Fully compatible with the latest version of the state-of-the-art MPEG-4 audio standard (LC-AAC, HE-AAC and HE-AAC v2)

Using Nero AAC Reference MPEG-4 & 3GPP Audio Encoder, converting your audio files to MPEG-4 AAC is simplicity itself. The encoder is available for download from our website free of charge.
Convert your source files to MP4 files with crystal-clear audio quality - at compression ratios from ultra-high (corresponds to approx. 58 CDs all packed onto one CD) to high-end audio (2.5:1).
The Nero AAC encoder tool is operated via the command line.
This tutorial will explain how this is done easily and quickly.
The following requirements must be met:
1. Nero AAC Encoder is installed on your PC (see downloading Nero AAC Encoder).
2. The desired source files are saved in PCM-WAV format (see converting audio CDs to WAV format).

Nero AAC Encoder is operated via the command line. You can specify quality settings and profile.
The complete command line consists of the following elements:
neroaacenc [options] -if "name of source file" -of "name of target file"

1. You can also use the decoder to convert MPEG4/3GPP files into PCM WAV format. Further details on this can be found in the readme.txt file contained in the ZIP archive.
2. Enter the command neraacenc -help in the command line and press Enter to display the help text and further command options. Help text is available for every file (encoder, decoder and metadata editor).
3. The operation will be simpler if you save the encoder and the files to a single folder directly on your hard drive (e.g. C:\aac). This saves you entering long path information.
4. To avoid error messages, pay careful attention to blanks, hyphens and the precise spelling of the file names when entering data. Entries are not case sensitive. If a file name contains blanks, surround it with inverted commas, e.g. "First song.wav".

This tutorial explains the operation by example of the encoder and files that are saved to C:\aac.
If you want to open the command line now, see opening the command line. If you want to convert a WAV file to MP4 format now, see compressing audio file. If you want to add cover information to already compressed files now, see adding cover information.

The license of this software is Freeware, you can free download and free use this audio converter software.