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 (~8–32 kbit/s/channel)*** Vorbis: handles general audio data at mid to high-level variable bitrates (~16–500 kbit/s/channel)*** Opus: handles voice, music and generic audio at low and high variable bitrates (~6–510 kbit/s/channel)** Lossless*** FLAC handles archival and high fidelity audio data.