July 31st, 2006 by Keith

AC3Filter 1.05a – Audio / Video Filter Plug-in

Posted in Fun Stuff, Utilities, Windows

AC3Filter

AC3Filter Project is back and alive! This plugin is very handy for some codec that does not perform well when playback some encoded movie files, such as DivX or Mpeg. AC3Filter is a DirectShow filter for AC3 decoding to play .AVI with AC3 audio tracks and MPEG2 (DVD). Though this may sound like an old release, but it’s a good as the latest available. Furthermore, the latest release of AC3Filter 1.05a is now available!

This is a free (open source) distribution, but it is as good as any other audio/video filter plugin that you can get elsewhere. For instance, if your .avi playback allows you to hear the background sound, but not the narration of the casts, then this may fix your problem.


AC3Filter is a high quality free DirectShow filter designed for real time audio decoding and processing. It has a priority on wide functionality and convenient settings. Filter can decode following audio formats: AC3/DTS/MPEG Audio. It also supports multi-channel and digital (SPDIF) outputs.

Main Features:

  • * 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

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