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OPUS files are audio files that use the Opus codec, a versatile format designed for high-quality voice and music streaming over the internet. The Opus codec is widely adopted for applications like VoIP, video conferencing, and streaming due to its low latency and efficient compression. It originated from a combination of Skype's SILK codec and Xiph.Org's CELT codec, making it exceptionally adaptable. This allows OPUS files to balance sound fidelity and file size effectively.
Technically, OPUS files are containerized audio streams that use the .opus file extension and typically utilize the Ogg container format for storage. The codec supports sampling rates from 8 kHz to 48 kHz and can encode mono or stereo audio channels. It employs both linear prediction (SILK) for speech and transform coding (CELT) for music, dynamically switching between them as needed. This hybrid approach makes OPUS highly efficient for compressing diverse audio types while maintaining low latency.
Opus is an open and royalty-free codec standardized by the Internet Engineering Task Force (IETF) in 2012, which has helped it gain widespread use in modern communication platforms. Many popular applications like Discord, WhatsApp, and Zoom use the Opus codec for transmitting audio. Its ability to handle a wide range of bitrates and audio qualities makes OPUS files ideal for real-time audio transmission. Additionally, Opus supports both constant and variable bitrate encoding, providing flexibility depending on network conditions.
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