AC3 Filter 2.5b

High quality freeware DirectShow audio decoder and processor filter used to decode audio tracks in movies.

June 18, 2012
Windows (all)
4.4 MB
   (34 votes)

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


  • Decode AC3/DTS/MPEG Audio Layer I/II formats
  • MPEG1/2 PES demultiplex (for DVD support)
  • PES/LPCM format support
  • AVI/AC3, AVI/DTS, WAV/AC3 and WAV/DTS support
  • AC3/DTS/MPEG Audio SPDIF passthrough support
  • AC3 encode to output any multichannel source to SPDIF
  • Detailed input bitstream format information
  • Automatic Gain Control
  • Dynamic Range Compression
  • Online output configuraion change
  • Upmix from any stereo source to 3*6 channels
  • Downmix to DolbySurround/ProLogic/ProLogic2
  • Input/output levels indication
  • Per*channel gain for all input/output channels
  • Per*channel delays
  • Direct access to mixing matrix


  • 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.

What's New:

  • 8 channels support
  • PCM Double output support
  • DTS-MA (core only), AAC, EAC3, FLAC, MP3 decoding support
  • Completely new bass redirection:
  • better filtering (4th order Linkwitz-Riley)
  • option to redirect bass to front speakers
  • Single icon per application
  • Online help
  • Crash report
  • Set filter language from the installer
  • Translations: Portuguese, Turkish, Dutch, Bulgarian, Ukrainian