Projects / FAAC


The FAAC project includes the AAC encoder FAAC and decoder FAAD2. It supports several MPEG-4 object types (LC, Main, LTP, HE AAC, PS) and file formats (ADTS AAC, raw AAC, MP4), multichannel and gapless en/decoding as well as MP4 metadata tags. The codecs are compatible with standard-compliant audio applications using one or more of these profiles.

Operating Systems

Recent releases

  •  02 Nov 2004 06:08

    Release Notes: The Winamp and CoolEdit/Adobe Audition output plugins now support ID3 and MP4 tag importing from input files, so they won't get lost during batch encoding to AAC/MP4. Their code was cleaned up, and common files are now located in the Cfaac subdirectory of the CVS repository.

    •  21 Oct 2004 17:32

      Release Notes: The new branch for the AAC decoder FAAD2 was added to the FAAC project in order to document its future releases independently from the encoder FAAC.

      •  18 Oct 2004 10:18

        Release Notes: This version includes updates of all text files in the main FAAC CVS folder: ChangeLog, News, Install, Readme, Authors, and ToDo.

        Recent comments

        07 Nov 2004 02:49 hansjuergen

        Re: Knowledge Base/Wiki page about FAAC
        And now clickable... FAAC Wiki page (

        07 Nov 2004 02:45 hansjuergen

        Re: Licenses
        A summary with more links and excerpts from the official overview of the MPEG-4 standard as well as related FAQs of the AAC license pool administrator Via is available here:

        License Information (

        26 Sep 2004 07:23 hansjuergen

        Re: Dependencies
        I also added some Freshmeat projects as optional dependencies that use other or no AAC codecs at all (IBM Toolkit, Apple QuickTime and iTunes, Real/Helix Player and Producer), because they are nevertheless related to FAAC or FAAD2 and could use them in the context of the MPEG-4 standard. That way you'll get an overview of their download links on one page.

        24 Sep 2004 02:33 hansjuergen

        Knowledge Base/Wiki page about FAAC
        A user documentation about FAAC with recommended settings, resulting bitrates of the VBR quality mode, compatibility and so on is available in the Wiki of

        If you don't know some of the abbreviations used there, you should click on the related Wiki links for more, e.g. to AAC, MP4, HE AAC, LTP, TNS etc. There's also a page for FAAD2 and of course a forum where you can ask about anything related to these codecs.

        24 Sep 2004 02:09 hansjuergen

        The codecs are released under different licenses: while FAAC and FAAD (the outdated first release of the decoder) use the LGPL, FAAD2 is GPL. For more information see the homepage and/or the Readme files in the source code package or CVS, also about patent issues related to the AAC format.


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