River Past Audio Converter converts from audio and extract audio from video to WAV, MP3, WMA (Windows Media Audio) or audio-only AVI files.River Past Audio Converter is a software that allows you to convert audio files. River Past Audio Converter can convert from Dolby Digital AC-3, AIFF/AIFC, AU, MP3, MPA, OGG, RealAudio RA/RAM, SD2, SND, WAV and WMA. River Past Audio Converter can also extract audio from 3GPP/3GPP2, ASF, AVI, VCD DAT, DivX, DV, IVF, QuickTime MOV, MP4 (MPEG-4), MPG (MPEG-1 and MPEG-2), RealMedia RM, DVD VOB, WMV and XviD.