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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.
MIDI was created in 1982 by leading manufacturers of electronic musical instruments - Yamaha, Roland, Korg, E-mu, and others. Manufacturers wanted an easy way to make their products compatible with devices from other brands. Unlike regular audio files such as MP3 or WAV, MIDI files do not contain actual audio data and are therefore much smaller. The MIDI interface transmits information about the actions performed on the musical device - for example, pressing a key. This contains information about two parameters: the number of the pressed key and the force of impact on it. Before the advent of standard MIDI files, an arrangement prepared in one sequencer could not be loaded into another due to format incompatibilities. Another plus of MIDI is that polyphony was originally laid in this standard. That is, you could easily use multiple tools.