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Opus hasn't caught on for music and podcasts, but is very popular in some other areas. YouTube uses Opus heavily, for example, and its the default audio codec for webm video files. It's also very popular for real time audio like in video conferencing.

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This needs to be more widely shouted, Opus derives from CELT which was primarily focused on low latency audio encoding (which mp3 really sucks at) and it's the defacto standard for VoIP. Although for professional applications like wireless companies will use their own proprietary codecs.

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