Opus

Opus
Name	Opus
Extension	.opus
Developer	Internet Engineering Task Force (IETF)
Released	2012
Container for	Audio
Extended from	SILK, CELT
Standard	RFC 6716

Opus is an audio codec developed by the Internet Engineering Task Force (IETF) with the help of Mozilla, Microsoft, and Google. It is designed to be a highly versatile and efficient codec, supporting a wide range of bitrates and sample rates, making it suitable for various applications, including Voice over IP (VoIP), video conferencing, and music streaming. The development of Opus involved the collaboration of several organizations, including Xiph.Org Foundation, Skype, and Broadcom. Opus is also used by popular platforms such as YouTube, Facebook, and Twitter.

Introduction

Opus is an open-standard codec, which means that it is freely available for use and implementation, without any patent or royalty restrictions. This has led to its widespread adoption by many companies and organizations, including Apple, Amazon, and Netflix. Opus is also highly flexible, allowing it to be used in a variety of scenarios, from low-bitrate speech codec applications to high-bitrate music codec applications. The flexibility of Opus has made it a popular choice for many streaming media platforms, including Spotify, Tidal, and Deezer. Additionally, Opus is used by Firefox, Chrome, and Safari web browsers.

History

The development of Opus began in 2010, when the IETF formed a working group to create a new audio codec that could meet the needs of the rapidly evolving Internet landscape. The working group brought together experts from various companies and organizations, including Google, Microsoft, and Mozilla. The result was a codec that combined the best features of two existing codecs: SILK and CELT. SILK was developed by Skype, while CELT was developed by Xiph.Org Foundation. The Opus codec was finalized in 2012 and published as RFC 6716. The development of Opus also involved the participation of other organizations, such as Cisco Systems, Ericsson, and Huawei.

Technical Details

Opus is a hybrid codec, meaning that it uses a combination of different techniques to achieve high-quality audio compression. It uses linear predictive coding (LPC) for speech signals and modified discrete cosine transform (MDCT) for music signals. Opus also uses a technique called psychoacoustic modeling to reduce the amount of data required to represent an audio signal. This makes it highly efficient and suitable for use in low-bitrate applications, such as VoIP and video conferencing. Opus is also highly scalable, supporting bitrates ranging from 6 kilobits per second (kbps) to 510 kbps. The technical details of Opus have been influenced by the work of researchers at Stanford University, Massachusetts Institute of Technology (MIT), and University of California, Berkeley.

Applications

Opus is used in a wide range of applications, including Voice over IP (VoIP), video conferencing, music streaming, and online gaming. It is also used in various web browsers, including Firefox, Chrome, and Safari. Opus is also used by popular platforms such as YouTube, Facebook, and Twitter. Additionally, Opus is used by Skype, Google Hangouts, and Microsoft Teams for video conferencing and voice chat. The use of Opus has also been adopted by Sony, Samsung, and LG Electronics in their smartphones and tablets.

Comparison to Other Formats

Opus is often compared to other audio codecs, such as MP3, AAC, and Vorbis. Opus has several advantages over these codecs, including its ability to support a wide range of bitrates and sample rates, as well as its highly efficient compression algorithm. Opus is also more flexible than other codecs, allowing it to be used in a variety of scenarios, from low-bitrate speech codec applications to high-bitrate music codec applications. The comparison of Opus to other formats has been studied by researchers at University of Oxford, University of Cambridge, and Carnegie Mellon University.

Development and Maintenance

The development and maintenance of Opus is overseen by the Internet Engineering Task Force (IETF). The IETF is a non-profit organization that is responsible for the development and maintenance of Internet standards. The Opus codec is also maintained by a community of developers and contributors, who work together to improve and update the codec. The development of Opus has involved the participation of many organizations, including Mozilla, Microsoft, and Google. The maintenance of Opus is also supported by Xiph.Org Foundation, Skype, and Broadcom. Additionally, Opus is used by Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP) for their cloud computing services.

Category:Audio codecs