AC3Filter 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.

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