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The AIFF extension is an audio format file developed by Apple Computer in 1988 based on Electronic Arts' IFF format, and is most commonly used in Apple Macintosh computers. Contains CD-quality audio that is stored in an uncompressed lossless format. The content of the file is uncompressed PCM data, a digitized analog audio signal. Like any uncompressed file, AIFF files take up much more disk space than their compressed counterparts: one minute of stereo audio at 44.1 kHz sampling rate and 16 bits takes about 10 MB. The standard file extension is .AIFF or .AIF, for the compressed version the .AIFC extension must be used. AIFFs are widely supported and can store LPCM, they are suitable file formats for storing and archiving the original recording.
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.