AC3Filter is high quality freeware DirectShow audio decoder and processor filter used to decode audio tracks in movies (DVD, MPEG4 and others). It has a priority on wide functionality and convenient settings.

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AC3 Filter can decode following audio formats: AC3 / DTS / MPEG Audio. It also supports multi-channel and digital (SPDIF) outputs.

Features of AC3 Filter 1.63 :

- Decoding of AC3/DTS/MPEG1/2 Audio Layer I/II formats
- Support of DVD, AVI/AC3, AVI/DTS, WAV/AC3 and WAV/DTS
- Audio processing for any source
- Decomposition of any source to 6 channels
- Full information about audio track format
- Support of SPDIF passthrough mode
- Multi-channel audio output from all sources on SPDIF (on-the-fly AC3 encoding)
- Per-channel amplification for all input/output channels
- Per-channel delays (for compensation of distance difference to speakers)
- Automatic gain control
- Clipping
- Dynamic Range Compression, DRC
- Level indication for input and output channels
- Matrix mixer and ability of direct modification of mixing matrix
- Dolby Surround / Pro Logic / Pro Logic II downmix

Tags :

- Audio Codec Tag 2000 may be requested when AC3 Filter is missing.
- Audio Codec Tag 8192 may be requested when AC3 Filter is missing.
- It also solves AC3 DVM codec missing, reported by AVIcodec utility.

Changes in AC3 Filter 1.63b :

- AC3 decoding bug fixed (Issue 1)
- Channel order bug fixed (issue 43)
- Remote control using messages
- Write version number to the registry on install (issue 17)
- Command line interface for AC3Config utility (run ac3config /? for help)
- Swedish translation added (thanks to Niclas Burgren)
- French language updated (thanks to Philippe AGUESSE)

Changes in AC3 Filter 1.46 :

- AC3 encoder bitrate is now adjustable
- 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)

Changes in AC3 Filter 1.11 :

- Now filter saves output settings to preset (so now you can create presets with different output configurations)
- Tray icon and some other options display fixed
- Fixed crash with TMPEnc