RealAudio sipr

• FOURCC: sipr
• Company: RealNetworks
• Samples: http://samples.mplayerhq.hu/real/AC-sipr/

Audio codec found in RealMedia files, not as common as cook.

Allegedly the same codec as ACELP.net. May be partly based on G.729, however RealAudio predates the finalization of the G.729 specifications for the 6.5 kbit/s and 11.8 kbit/s variants. ITU-T G.729 page

Codec library with debugging symbols: v50b3_linux20elf.tar.gz

Sipr flavors

0  6.5 Kbps Voice
1  8.5 Kbps Voice
2  5 Kbps Voice
3  16 Kbps Voice