Opus release 1.5 Opus 1.5 is the first release to make extended use of ML in the encoder and decoder. Major changes since 1.4 include: - Significant improvement to packet loss robustness using Deep Redundancy (DRED) - Improved packet loss concealment through Deep PLC - Low-bitrate speech quality improvements down to 6 kb/s wideband - Improved x86 (AVX2) and ARM (Neon) optimizations - Support for 4th and 5th order ambisonics