River Past Audio Converter is an easy-to-use, fast, and powerful audio conversion and extractor software.

It converts from audio and extract audio from video to WAV, MP3, WMA (Windows Media Audio) or audio-only AVI files.

It can convert from Dolby Digital AC-3, AIFF/AIFC, AU, MP3, MPA, OGG, RealAudio RA/RAM, SD2, SND, WAV and WMA. It 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.

The extract format conversion supported:
AC3 to MP3, AC3 to WAV, AC3 to WMA
AIF to MP3, AIF to WAV, AIF to WMA
AIFF to MP3, AIFF to WAV, AIFF to WMA
AIFC to MP3, AIFC to WAV, AIFC to WMA
AU to MP3, AU to WAV, AU to WMA
MP3 to MP3, MP3 to WAV, MP3 to WMA
MPA to MP3, MPA to WAV, MPA to WMA
OGG to MP3, OGG to WAV, OGG to WMA
RA to MP3, RA to WAV, RA to WMA
SND to MP3, SND to WAV, SND to WMA
WAV to MP3, WAV to WAV, WAV to WMA
WMA to MP3, WMA to WAV, WMA to WMA
3GPP to MP3, 3GPP to WAV, 3GPP to WMA
AVI to MP3, AVI to WAV, AVI to WMA
DAT to MP3, DAT to WAV, DAT to WMA
DivX to MP3, DivX to WAV, DivX to WMA
DV to MP3, DV to WAV, DV to WMA
IVF to MP3, IVF to WAV, IVF to WMA
MOV to MP3, MOV to WAV, MOV to WMA
MP4 to MP3, MP4 to WAV, MP4 to WMA
MPG to MP3, MPG to WAV, MPG to WMA
MPEG-1 to MP3, MPEG-1 to WAV, MPEG-1 to WMA
MPEG-2 to MP3, MPEG-2 to WAV, MPEG-2 to WMA
RM to MP3, RM to WAV, RM to WMA
VOB to MP3, VOB to WAV, VOB to WMA
WMV to MP3, WMV to WAV, WMV to WMA
XVID to MP3, XVID to WAV, XVID to WMA
VCD to MP3, VCD to WAV, VCD to WMA

For WAV/MP3 output, you have the full control over the codec, sample rate, channel, bits per sample, and bitrate settings. For WMA output, you can choose from a list of Windows Media profiles. Easy to use batch processing. Extremely fast and reliable.

No Adware or spyware. DX8 and Windows Media Format 9 runtime required. (download link available on web site).

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Limitations: Unregistered version limits conversion to 2 minutes each file