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01 ·Audio Codecs·★ MEMBER·PAPER·11 min read Why Opus Won — The Design of a Modern Audio Codec Audio codecs used to split cleanly into speech codecs and music codecs. Opus ended the split by stacking two engines, SILK and CELT, inside a single bitstream. This piece works up from zero: how linear prediction and the MDCT divide the spectrum between them, why CELT refuses to let band energy collapse, what actually sets a codec's latency, and the technical and institutional reasons Opus became WebRTC's mandatory codec.