libopus 1.4 – Opus Codec

This Opus 1.4 major release brings the following improvements and fixes:

Improved tuning of the Opus in-band FEC (LBRR). See the issue for details
Added a OPUS_SET_INBAND_FEC(2) option that turns on FEC, but does not force SILK mode (FEC will be disabled in CELT mode)
Improved tuning and various fixes to DTX
Added Meson support, improved CMake support In addition to the improvements above, this release includes many minor bug fixes.

Additionally, we have begun experiments on upcoming neural packet loss concealment and deep redundancy (DRED) features. Although not included in this release, you can see two IETF drafts describing the proposed extension and redundancy mechanisms. The code is also available on this development branch.