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OPUS file is an audio file created in the Opus format, a lossy audio format designed for streaming on the Internet. It uses both SILK (used by Skype) and CELT (from Xiph.Org) codecs and supports variable bit rates from 6 kbps to 510 kbps. Opus is a completely open source, royalty-free, highly versatile audio codec. Opus is good for streaming both speech and music over the Internet. The Opus codec is used for Voice over IP (VoIP), video conferencing, in-game chat. The Opus format is supported by various software, including the TeamSpeak VoIP application, the Mozilla Firefox browser, the GStreamer framework, and the VLC media player. The main advantages of OPUS are the high audio quality and good compression achieved through dynamic adaptive streaming.
The WAV format is designed to work with a digitized audio stream, contains musical compositions, voice recordings and various audio effects. It is the best audio format for processing and storing uncompressed audio data that is similar in quality to CDs. One minute of sound in it weighs about 10 MB. WAV occupies a significant amount of memory space, much more than other popular formats, so very few people use this format to store their own audio library on a computer. The Wave format is needed for the release of a disc, LP, download for sale on sites, and must be with the parameters of 16 bit 44.1 KHz. It is also used in audio editing programs to save time on compressing and decompressing data. The WAV format is only a container file, and the audio content is compressed using a wide variety of codecs.