Changes since 1.2.x include:
- Improvements to the VAD and speech/music classification using an RNN
- Support for ambisonics coding using channel mapping families 2 and 3
- Improvements to stereo speech coding at low bitrate
- Using wideband encoding down to 9 kb/s
- Making it possible to use SILK down to bitrates around 5 kb/s
- Minor quality improvement on tones
- Enabling the spec fixes in RFC 8251 by default
- Security/hardening improvements
Notable bug fixes include:
- Fixes to the CELT PLC
- Bandwidth detection fixes
* new analysis code and tuning that significantly improves encoding
quality, especially for variable-bitrate (VBR),
* automatic detection of speech or music to decide which encoding
mode to use,
* surround with good quality at 128 kbps for 5.1 and usable down
to 48 kbps,
* and speed improvements on all architectures.
The Opus codec is designed to handle a wide range of interactive
audio applications, including Voice over IP, videoconferencing,
in-game chat, and even remote live music performances. It can scale
from low bit-rate narrowband speech to very high quality stereo
music.
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