{"id":114134,"date":"2024-03-05T18:26:01","date_gmt":"2024-03-05T16:26:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupen-audiokodek-opus-1-5"},"modified":"2024-03-05T18:26:01","modified_gmt":"2024-03-05T16:26:01","slug":"dostupen-audiokodek-opus-1-5","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/dostupen-audiokodek-opus-1-5","title":{"rendered":"Opus audio codec 1.5 is available","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
After nearly a year of development, the Xiph.Org organization, which focuses on developing open video and audio codecs, has released the Opus 1.5 audio codec, providing high coding quality and minimal latency for both high-bitrate streaming audio and voice compression in low-bandwidth VoIP applications. Reference implementations of the encoder and decoder are distributed under the BSD license. Full specifications of the Opus format are publicly available, free, and have been approved as an internet standard (RFC 6716). <\/p>\n
The codec was created by combining the best technologies from the CELT codec developed by Xiph.org and the SILK codec from Skype. In addition to Skype and Xiph.Org, companies such as Mozilla, Octasic, Broadcom, and Google also participated in the development of Opus. The patents involved in Opus are provided by the participating companies for unlimited use without paying licensing fees. All intellectual property rights and patent licenses related to Opus are automatically delegated to applications and products using Opus, without the need for additional agreements. There are no restrictions on the scope of application and the creation of alternative third-party implementations. However, all granted rights are revoked in the event of a patent dispute related to Opus technologies against any Opus user. <\/p>\n
Opus offers high coding quality and minimal delay for both high-bitrate streaming audio compression and voice compression in bandwidth-limited VoIP applications. Previously, Opus was recognized as the best codec when using a bitrate of 64Kbit (Opus outperformed competitors like Apple HE-AAC, Nero HE-AAC, Vorbis, and AAC LC). Notable products that support Opus out of the box include the Firefox browser, the GStreamer framework, and the FFmpeg package. <\/p>\n
Key features of Opus: <\/p>\n
\n
Bitrate from 5 to 510 Kbit\/s; <\/li>\n
Sampling frequency from 8 to 48 KHz; <\/li>\n
Frame duration from 2.5 to 120 milliseconds; <\/li>\n
Support for constant (CBR) and variable (VBR) bitrates; <\/li>\n
Support for narrowband and wideband audio; <\/li>\n
Support for speech and music; <\/li>\n
Support for stereo and mono; <\/li>\n
Support for dynamic adjustment of bitrate, bandwidth, and frame size; <\/li>\n
Ability to recover the audio stream in case of frame loss (PLC); <\/li>\n
Support for up to 255 channels (multi-stream frames) <\/li>\n
Availability of implementations utilizing both floating-point and fixed-point arithmetic. <\/li>\n<\/ul>\n
Key innovations in Opus 1.5: <\/p>\n
\n
The encoder and decoder have expanded the application of machine learning technologies.\n
The \"Deep Redundancy\" (DRED) mechanism has been implemented, utilizing machine learning to recover sound fragments lost due to packet loss.\n
Improved sound stream recovery in case of frame loss with the machine learning mechanism Deep PLC (Packet Loss Concealment).\n
Enhanced speech transmission quality at low bitrates (~ 6 Kbps).\n
Additional optimizations have been added, utilizing AVX2 (x86) and Neon (ARM) instruction sets.\n
Support for 4th and 5th order Ambisonics surround sound format has been added, considering sound propagation not only in the horizontal plane but also in the vertical plane (to determine whether the sound source is above or below). <\/ul>\n