Supported Input Formats
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River Past Audio Converter can convert or extract audio from the following formats. Some of them may require additional downloads.

File Extension
Description
Additional Download
3GP, 3G2
3GPP/3GPP2
Apple QuickTime
AAC
MPEG-4 AAC
Apple QuickTime or 3ivx or CCCP
AC3
Dolby Digital AC-3
AC-3 Decoder Filter
AIF, AIFF
MacOS AIFF
None for AIFF (uncompressed)
AIFC
MacOS AIFC
Apple QuickTime for AIFC (compressed)
AMR
Adaptive Multi-Rate
Apple QuickTime
APE
Monkey Audio
Radlight APE DirectShow Filter
ASF
Advanced Streaming Format
None
AU
Sun Microsystems audio
None
AVI
Audio Video Interleave
May require third party codecs
DAT
VCD or SVCD
None for VCD
DivX
DivX
None
DV
Digital Video
Apple QuickTime
FLAC
Free Lossless Audio Codec
CoreFlac
IVF
Intel Video Technology
None
MOV, QT
QuickTime
Apple QuickTime
MKV
Matroska
CCCP
MP1, MP2, MPA
MPEG Layer-1 or Layer-2
None
MPG
MPEG-2 Video
May require AC-3 Decoder Filter
MP3
MPEG Layer-3
None
MP4
MPEG-4
Apple QuickTime or 3ivx or CCCP
MPG, MPEG
MPEG-1 or MPEG-2
None
OGG
OGG Voribs
OGG Vorbis DirectShow Filters
OGM
OGG Media
OGG Vorbis DirectShow Filters
RA, RAM
RealAudio
Real Alternative, AC-3 Decoder Filter
RM, RAM
RealMedia
Real Alternative, AC-3 Decoder Filter
SHN
Shortened WAV Format
SHN DirectShow Filter
SND
NextStep Sound
None
SD2
Sound Designer 2
Apple QuickTime
VOB
DVD
AC-3 Decoder Filter
WMA
Windows Media Audio
None
WMV
Windows Media Video
None
XivD
XviD
None