AC3Filter is a populer audio filter. AC3Filter - it is DirectShow filter for AC3 decoding to play .AVI with AC3 audio tracks and MPEG2 (DVD). Distributed absolutely for free (FREEWARE, OpenSource).

ac3filter Features

• Full AC3 standard compliance.
• S/P DIF passthrough support.
• Decode MPEG2 PES streams.
• Multichannel output support.
• LFE support.
• Dynamic Range Compression (DRC) support.
• Overflow control and automatic gain control.
• Gain levels control.
• Bitstream information (channel format, bitrate, sample rate, coupling freq and maximun freq).
• Input/output levels.
• Matrix mixer with direct control of mixing matrix.
• Stereo to multichannel mixing.
• DolbySurround/ProLogic/ProLogicII downmixing.
• Delays for each channel.
• Equalizer.