Fraunhofer Pro-Codec


Real-time comparison of up to 5 simultaneously encoding streams, including AAC, mp3 pro and Apple’s iTunes+.


Audition codecs in real-time

We spend our professional lives making mixes sound as good as they can – and then hand them on for encoding and distribution. Later we often wish we could have made some improvements. 

What if there was a way to audition and compare up to five audio codecs in real time? Enter the Fraunhofer Pro-Codec plugin. 

Its intuitive display helps you quickly focus on key issues such as codec effect on frequencies, audible artefacts and codec-induced overloads. Optimize your mix for specific formats, such as AAC or mp3, before encoding it using the plugin or the separate manager application for background batch processing.

Fraunhofer pro codec plugin gui
  • Real time auditioning & encoding with glitchless switching 
  • Supported Codecs: 

- mp3, Apple AAC (Mac only), AAC-LC, HE-AAC, HE-AAC-V2, xHE-AAC

- AAC-LC & HE-AAC multichannel

  • Select up to 5 codecs for simultaneous real-time encode 
  • Batch processing using dedicated Manager application
  • Comprehensive metadata editing
  • ABX mode for blind statistical testing
  • DIFF monitoring; listen to effect of codec on input signal
aax native
audio unit
vst 3
mac os
ilok usb

 This plug-in offers 2 activations for each product licence you own.

 All licences must be kept on the same iLok account, and each activation will allow you to authorise your Plug-In using the following methods:


  • iLok USB device. iLok2 / iLok3 required with latest drivers

 For more information about these choices please click here.

  • Pro Tools 11 and above – AAX Native 
  • Approved Pro Tools CPU, OS and hardware configuration:
  • For legacy versions, including 32bit and RTAS support, please contact support
  • iLok2 or iLok3.
Audio Units
  • Mac OS X 10.12 or later (Intel or Apple Silicon)
  • iLok2 or iLok3.
  • Mac OS X 10.12 or later (Intel or Apple Silicon)
  • Windows 7 or later
  • iLok2 or iLok3.



Please see the following support article on general DAW compatibility - General DAW Compatibility

The Sonnox Fraunhofer Pro-Codec does not support Avid’s TDM/HDX hardware DSP platform. This includes Venue, S3L and S6L systems.

CodecMode44.1 kHZ48 kHz88.2 kHZ96 kHZ
MP3CBR max/min13849/734513849/734526978/1469026978/14690
HE-AACCBR max/min7398/73007398/73007296/36487296/3648
HE-AAC v2CBR/VBR915391531830618306
44.1 – 48 kHz:
88.2 – 96 kHz:
176.4 – 192 kHz:

The Fraunhofer Pro-Codec is also available in the following money-saving bundles.

  Pro-Codec Codec Toolbox
Real-time Codec auditioning
Encode to mp3 or AAC formats
Decode to WAV or AIFF
High quality codecs from Fraunhofer
High quality iTunes+ codec from Apple
Encode audio with samples rates up to 192kHz
Encode audio only at 32, 44.1 and 48kHz
Full resolution encoding of 16, 24 and 32-bit files
16-bit resolution encoding of 16, 24 and 32-bit files
Listen to difference between input and codec output
Visual frequency feedback from FFT
Detailed NMR frequency indicator
Ability to select up to 5 codecs for simultaneous comparison
Encode to 5 different formats simultaneously
ABX Test mode
Trim levels manually
Compression ratio meters
Online / realtime encoding with a DAW
Variable quality settings
Metadata editing
Batch processing