Audio

AVI2AC3 Filter

Extracts AC3 Dolby Digital 5.1 audio embedded in AVI files. Fixes silent or incorrect audio in old DVD rips stored as AVI.

Download AVI2AC3 Filter Mirror Download ↗
Version 1.8.9.143
File AVI2AC3Filter.ax
Platform Windows
Architecture x86 + x64
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About AVI2AC3 Filter

AVI2AC3 Filter is a DirectShow filter that extracts AC3 (Dolby Digital) audio tracks that have been muxed into AVI container files. This was a common practice in the early 2000s for home theater rips where the original AC3 5.1 surround track was preserved inside the AVI wrapper.

Standard AVI containers officially support only uncompressed PCM and MP3 audio. However many rippers in the early DVD era embedded AC3 audio streams into AVI files anyway, using a workaround that Windows and most media players do not handle correctly by default. AVI2AC3 Filter detects these embedded streams and routes the raw AC3 data to a Dolby Digital decoder, enabling correct 5.1 surround audio playback from these files.

If you have an older AVI file where the video plays but the audio is silent, distorted, or plays as a single mono channel instead of surround, the file likely contains an embedded AC3 track that requires this filter to decode correctly.

Installed to System32 (64-bit) and SysWOW64 (32-bit) and registered automatically with DirectShow.

Supported Formats

.avi AC3 in AVI Dolby Digital 5.1

Compatible Players

Windows Media Player
MPC-HC
MPC-BE
PotPlayer
Any DirectShow player

Installation

AVI2AC3 Filter is installed as part of X Codec Pack 2.7.4. The filter registers automatically with the Windows DirectShow subsystem and becomes immediately available to all compatible media players.

Files are installed to System32 (64-bit) and SysWOW64 (32-bit). No user folder selection is needed. The installer supports silent mode for IT deployments: run with /S flag.

Frequently Asked Questions

AVI2AC3 Filter is a DirectShow filter that extracts AC3 (Dolby Digital) audio embedded inside AVI container files. This was common practice for DVD rips in the early 2000s where the original 5.1 surround track was preserved inside an AVI file. Without this filter the AC3 audio either plays incorrectly or not at all.
If an AVI file has silent audio, distorted mono sound, or the wrong language track, it likely contains an AC3 audio stream embedded using the unofficial AC3-in-AVI method. Installing AVI2AC3 Filter enables Windows and DirectShow players to correctly detect and decode this audio track.
This technique was mainly used for DVD rips made between roughly 1999 and 2007, where the encoder preserved the original Dolby Digital 5.1 surround track from the DVD inside an AVI file. These files often have very large audio streams compared to a standard MP3 track, and the audio stream type is listed as AC3 or 0x2000 in media info tools.
No. AVI2AC3 Filter only activates when it detects an AC3 audio stream inside an AVI container. Standard AVI files with MP3 or PCM audio are handled by the normal AVI Splitter and are not affected.
Any DirectShow-compatible player uses it automatically once installed, including Windows Media Player, MPC-HC, MPC-BE and PotPlayer. The filter registers itself with the DirectShow subsystem and is selected automatically when the appropriate audio stream type is detected.
Yes. It is an open-source component from the MPC-HC project. It installs AVI2AC3Filter.ax to System32 and SysWOW64 and registers it as a COM server. It contains no adware or spyware and can be removed cleanly via the uninstaller.