Being a container format, Ogg can embed audio and video in various formats (such as Dirac, MNG, CELT, MPEG-4, MP3 and others) but Ogg was intended to be, and usually is, used with the following Xiph.org free codecs: Audio Lossy Speex: handles voice data at low bitrates (~2.1–32 kbit/s/channel) Vorbis: handles general audio data at mid to high-level variable bitrates (≈16–500 kbit/s per channel) Opus: handles voice, music and generic audio at low and high variable bitrates (≈6–510 kbit/s per channel) Lossless FLAC handles archival and high fidelity audio data.
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