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Opus is a new open audio format. Read more at Wikipedia
These files have been created from .wav files using opusenc version 0.1.8 (uses Libopus 1.1). Piece "Observatoorium 2013" is used in all examples.
As usual - capabilities of codecs can change over time so stay tuned!
VBR:
128 kbps
64 kbps
32 kbps
CVBR(Constrained Variable Bit Rate):
128 kbps
64 kbps
32 kbps
Hard CBR(Constant Bit Rate):
128 kbps
64 kbps
32 kbps
Files made with an older version of the codec:
These files have been encoded from .wav files using opusenc version 0.1.2 (which uses Libopus 1.0.1), using constant bitrate(parameter --hard-cbr)

This work is licensed under a Creative Commons Attribution-Noncommercial 3.0 Unported License.
(cc-by-nc) Tarmo Tanilsoo, 2009