This Opus 1.2 major release brings many quality improvements, new features, and bug fixes. You can read all the details in this release demo page. Changes since 1.1.x include:

Speech quality improvements especially in the 12-20 kbit/s range

Improved VBR encoding for hybrid mode

More aggressive use of wider speech bandwidth, including fullband speech starting at 14 kbit/s

Music quality improvements in the 32-48 kb/s range

Generic and SSE CELT optimizations

Support for directly encoding packets up to 120 ms

DTX support for CELT mode

SILK CBR improvements

Support for all of the fixes in draft-ietf-codec-opus-update-06 (the mono downmix and the folding fixes need --enable-update-draft )

) Many bug fixes, including integer wrap-arounds discovered through fuzzing (no security implications)

There are no known regressions compared to the latest stable release (1.1.5). Please report any problems.

Source code: opus-1.2.tar.gz