Opus release 1.3 Opus 1.3 is the latest major release of Opus and brings many improvements, including: - The spec fixes in RFC 8251 are now enabled by default - Improvements to the VAD and speech/music classification using an RNN - Improvements to stereo speech coding at low bitrate - Support for ambisonics coding using mappings 2 and 3 - Making it possible to use SILK down to bitrates around 5 kb/s - Using wideband encoding down to 9 kb/s - Minor quality improvement on tones - Security improvements Notable bug fixes include: - Fixes to the CELT PLC - Bandwidth detection fixes