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AC-3 ACM Codec

A codec that allows AC3 decoding, encoding (eg. in VirtualDub) based on the free liba52 library
Language: English
Ease of use: Not Rated
Latest Version: 2.2 (details)
OS Support: Windows 98 Windows Me Windows 2000 Windows XP Windows 2003 Windows Vista Windows 7
License: Open Source
Last Updated:
Page Viewed: 82567 times



Description:Download the AC-3 ACM Codec
Version:2.2 (added Jul 22, 2012 - view changelog)
Size:144 KB

Download: AC3ACM-source.7z   AC3ACM-source.7z

Description:Download the source code for AC-3 ACM Codec
Version:2.2 (added Jul 22, 2012 - view changelog)
Size:250 KB

Show All Downloads & Links (1 more)

Old Version Downloads (16 downloads)


From the Readme:
Basically I've wrapped an Audio Compression Manager interface around the free liba52 library by Aaron Holtzman and Michel Lespinasse, and the ac3enc code by Fabrice Bellard from ffmpeg. This makes it possible to preview, decode, and encode AC-3 audio in VirtualDub (or almost any ACM client).

AC3ACM is released under the GNU General Public License, and you should have received a copy of this license as "GPL.txt" in the parent folder of the distribution. I recommend you read it before using the software. I make no guarantee that AC3ACM will work for you, and I won't be held responsible if your computer explodes, and so on...

Note that this zip contains two builds of the codec. The files in the "x86" folder are for Windows 32-bit operating systems, and the files in the "x64" folder are for Windows 64-bit operating systems.

If you've never installed the codec before, simply double-click the approriate .bat file for your platform (32-bit or 64-bit). If you get a scary warning that the codec has not passed "Windows Logo testing" (which is quite true by the way), choose to "Continue Anyway."

To uninstall the codec, start Control Panel's "Add/Remove Programs" dialog, select "AC-3 ACM Codec 1.6", and press the "Add/Remove" button.

If you have installed a previous version of the codec, I recommend you uninstall the old version as described above, and reboot Windows before installing this version. (It's probably not necessary to do all that, but again, it can't hurt.)

AC3ACM was compiled with Visual Studio 2005 Pro, and tested on Windows 98 SE and 32-bit Windows XP Pro SP3. I haven't tested it on 64-bit Windows platforms. You can download the full source code at Future updates of the software will also be available at that site.

If necessary I can be contacted at fcchandler at comcast dot net, but I don't check my e-mail very often unless I'm expecting something. You'll get a much quicker response by contacting me at the Unofficial VirtualDub Support Forums. (As an administrator I visit there several times a day.) The URL is


Main Categories: DVD/SVCD/VCD (MPEG-1/2)
Sub Categories:

Supported File Formats:

Input Files: AC3

OS Compatibility:

Windows 98/Windows Me/Windows 2000/Windows XP/Windows 2003/Windows Vista/Windows 7

Revision History:

Version 2.2
  • Release Date: Jul 22, 2012
  • Download(s):
  • By request the x86 version now works on Windows 95 OSR2 and Windows NT 4.
View complete revision history

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Average: 3.90/5
Total Ratings: 15


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