New! Spdifer is a DirectShow filter that allows media players to passthrough multi-channel sound to the digital (SPDIF) output without any change, so an external receiver can decode it.

Release notes:

Supports passthrough for AC3, DTS and MPEG Audio (including mp3) formats. All passthrough features of the 'big brother' AC3Filter are supported.

It was a problem with installer in AC3Filter 1.46. If you have problems with installing it, please download it again. Sorry for inconvenience.

New! AC3Filter tools is a set of command-line utilities for manipulating audio files.

Release notes:

• Initial release
• Built on AC3Filter 1.46 code base

New! This plugin allows CoolEdit / Adobe Audition to read AC3 and DTS files and write AC3 files.

Release notes:

Syltran lake (Elbrus region)

• Initial release
• Built on AC3Filter 1.46 code base
• Reads AC3 and DTS files
• Writes mono/stereo AC3 files (bitrate ajustable)

Release notes:

Elbrus mountain (July 2007)

• AC3 encoder bitrate is now ajustable
• Korean translation added (thanks to starcodec)
• Upmixing of Dolby Surround files works now (thanks to Stefan Schott)
• MPEG Audio Joint stereo playback fixed (thanks to Daniel Bechter)
• Problem with decimal point in mixing matrix on some non-english Windows (thanks to Marcin Hencz)

Maybe you’ve seen many good Open Source projects that are no longer maintained. One of the many reasons for that may be lack of contribution. In fact, there are many one-man projects out there. Most of any program’s users are just that, users, not developers. Nevertheless, average users still can contribute to Open Source programs to make them better.

Mixing matrix article described how matrix mixing works and some channel swapping magic. This article focuses on phase inverting. It describes what is phase inversion, how to test and fix incorrect phase and how to make pseudo-stereo effect from mono track.

This article describes how to watch movies at night and under poor hearing conditions (noisy environment, weak speakers). At the first sight settings for poor hearing conditions and at night must be different. In the first case we need to make sound louder, and at night we should be quiet. Nevertheless, in both cases we need to do the same. Paradox? Not really...

Release notes:

• ACM codec is now included into the package
• Tab labels are now translatable
• All languages available so far integrated
• Avoid poEdit '\r' warning when creating a translation file
• Warning messages about dangerous options
• Loud noise was possible after output format switch or SPDIF state change
• Audio skips problem fixed once more

Remote debugging is very hard task. To track the problem a part of a file with problem is often needed. This guide tells how to cut such part.

Slovak by Artam
Portuguese (Brazilian) by ReX
Hungarian by Sziládi Zsolt
Chinese (Simplified) by FSYX
Italian by Gioxy
German by Filico
Polish by Łukasz Pasternak
Spanish by Ferny
Indonesian by Nicholas N.E

To use it, Download and upzip it to AC3Filter installation folder.

Translation is easy! This manual describes how to make a new translation of AC3Filter or fix bugs in an existing one with help of poEdit program.

One of the most interesting features of AC3Filter is mixing matrix. With help of mixing matrix filter does downmixing and upmixing. But you can use it in much more ways: reassign channels, invert the phase of incorrectly wired speakers, mix LFE to specific channels, etc.

Release notes:

• Localization support! Localization procedure is easy and can by done by everyone!
• Russian translation
• Fixed bug in AC3 decoder (audio skips). Thanks to Chris Meadowcroft!
• User manual fixed (broken in v1.35b)
• Mixing LFE channel into several channels preserves resulting loudness. LFE level now means gain relative to front channels.

Release notes:

• Now filter can work with very short files ( < 1sec )
• Fixed bug in AC3 decoder (audio skips). Thanks to Chris Meadowcroft!