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Aften is a simple, open-source, A/52 (AC3) audio encoder. It is based on the AC3 encoder from FFmpeg, but some improvements are added. Command line tool but GUIs are also available, download EncWavtoAC3 here or the old download AftenGUI here.

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Aften screenshot
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Latest version

0.08 (September 10, 2007)


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Download Aften 0.08  460KB  Win  Portable

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Download Aften old versions

Software License

Free software / FOSS (Free download and also Free and Open Source Software)

Supported operating systems


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Complete Version history / Release notes / Changelog

Release Name: 0.0.8

9 September 2007

Release 0.0.8 has mostly bug fixes since version 0.07. The versioning scheme for the Aften package has been changed to match the libaften shared library version number. A significant internal change is in the audio input module. Previous versions read WAVE files only, but for Aften 0.0.8, the audio input module was restructured to support raw PCM audio and to make it easier to provide future support for other audio formats.

Release Name: 0.07

Aften 0.07 is essentially a speed-enhancement release.Major feature additions include:
Additional MMX and SSE optimizations
Altivec support w/ optimized MDCT

- added C++ bindings (pass -DBINDINGS_CXX=1 to cmake to build them)
- API change of helper functions
- new and more precise bitalloc algorithm
- parallelization
- optional faster exponent strategy decision
- added SSE version of window function
- added MMX and SSE2 versions of some exponent related functions
- removed old build system
- frame-independent variable bandwidth
- minimum and maximum bandwidth settings for variable bandwidth mode
- altivec support framework (by David Conrad)
- altivec MDCT (by David Conrad)

Release Name: 0.06

Aften 0.06 is a big step forward.It features a new build
system using CMake which can create a shared library.There
have been many speed enhancements, including SSE optimizations
and a faster MDCT.Some of the algorithms have been enhanced
for higher quality encoding.The main feature addition in
this release is Dynamic Range Compression, which is working,
but is still in the early stages of usefulness.

- added SSE/SSE3 mdct code (based on vorbis lancer by
- added runtime SIMD detection code (Prakash Punnoor)
- added CMake build system with shared lib/dll support
- optional faster bit allocation by reducing accuracy/quality
- replaced MDCT code with implementation from libvorbis
- added Dynamic Range Compression encoding w/ profile selection
- improved exponent strategy decision
- accuracy increase in bit allocation
- new longhelp option for detailed commandline info
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Alternative to Aften


Guides and How to's

How to encode an Avi to dvd ready video and audio Using HCenc and Aften

- Read

Aften video tutorials

View all guides with guide description here

Tool features - Convert

Acronyms / Also Known As


Download Aften Portable download from the Download links under Download and Download other versions!

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3 reviews, Showing 1 to 3 reviews

I started to use this application today and was very impressed with the fuctionality and speed of this app. Its much faster then ffmpeggui which I used to convert wav to ac3, But Aften accepts an interleaved 6 channel audio wav file created with Adobe Audition and converted it to a 6 channel AC3. It sounded crisp and clear without any volume drop after the conversion. I am a happy customer! Oh I forget, this app is free. What more can I say?(LOL)

Review by Hittz on Sep 29, 2007 Version: o.7.0.0 OS: WinXP Ease of use: 8/10 Functionality: 8/10 Value for money: 9/10 Overall: 8/10

What is typical when using AftenGUI (and only this particular frontend, thus not EncWAVtoAC3 nor Aften on the command line), I get some sort of noise click right at the very end of the encoded ac3 file.

Peculiar, but keep up the good work!

Review by BlondMM on Aug 21, 2007 Version: 0.06 OS: WinXP Ease of use: 10/10 Functionality: 10/10 Value for money: 10/10 Overall: 9/10

Overall very good freeware. Much faster on my system than besweet. If using [url=]EncWavtoAC3[/url]GUI be sure to also download [url=]Aften[/url]and put it in the gui's directory.

Review by freebird73717 on Jul 2, 2007 Version: gui v..03 aften v.06 OS: WinXP Ease of use: 8/10 Functionality: 10/10 Value for money: 10/10 Overall: 9/10

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