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:

  • FFMPEG updated to v1.1.4
  • Use FFMPEG for AAC decoding (should be less crashes because faad bugs).
  • SPDIF/AC3 encoder: encode 5.1 with back channels (used by flac for instance) like 5.1 with side channels (standard for ac3).
  • Serbian language added (thanks to Rancher).
  • Languages updated: Basque (thanks to Xabier Aramendi), Chineese (thanks to PoYang).
  • Bug fixed: some languages was reset to english after restart.
  • Installer: /noicons option works now