AC3Filter tools is a set of command-line tools for manipulating audio files. It includes AC3 encoder and decoder, SPDIF format converter, parametric filter, graphic equalizer to name a few. Here is the list of all the applications in the pack: ac3enc: Simple AC3 encoder tool. It takes a WAV file at input and makes AC3 file. WAV file must have PCM format (16/24/32bit and floating point formats are supported). Multi-channel WAV files are supported (for example, files generated by valdec utility, see below). bsconvert: Bitstream converter utility. This utility converts files between numerous MPA/AC3/DTS stream types: SPDIF padded, 8/14/16bit big/low endian. By default, it converts any stream type to the most common byte stream. equalizer: Simple graphic equalizer. Example: Attenuate frequencies below 100Hz by 6dB, gain the band with the center at 200Hz by 3dB and leave everything after 500Hz unchanged. equalizer a.wav b.wav -f1:100 -g1:-6 -f2:200 -g2:3 -f3:500 filter: Simple parametric filter. Example: Band-pass filter from 100Hz to 8kHz with transition width of 100Hz. Attenuate all other frequencies (0-50Hz and 8050Hz to nyquist frequency) by 100dB. filter in.wav out.wav -bandpass -f:100 -f2:8000 -df:100 -a:100 gain: Just gain the wave. Example: gain a.wav b.wav -gain:-10 mpeg_demux: MPEG Program stream demuxer. This utility allows to extract individual streams from MPEG file. noise: Noise generator. You can playback some noise or generate a WAV file with noise. It supports PCM 16/24/32 bit or PCM float formats. It can generate multi-channel noise. resample: Sample rate conversion utility. You can specify transition band width and attenuation level. spdifer: This utility encapsulates AC3/DTS/MPEG Audio stream into SPDIF stream according to IEC 61937 standard. swab: This utility just swaps swaps byte order in a file. Bytes 0 1 2 3 ... are reordered as 1 0 3 2 ... valdec: Multi-functional file player, decoder and processor. This utility may be used for: Detect a file type To playback a file (AC3/DTS files are supported) Decode a file into raw/wav format. All output formats and processing options available in AC3Filter are supported! wavdiff: Finds the difference between 2 audio files. Calculates amplitude difference and RMS difference. Can compare files of different types, like PCM16 and PCM Float (number of channels and sample rate must match). Can write the difference into the difference file. May check maximum difference for automated testing.