Technical Details
| Quality | Nominal Bitrate | |
|---|---|---|
| Official Xiph.Org Foundation Vorbis | aoTuV beta 3 and later | |
| -q-2 | not available | 32 kbit/s |
| -q-1 | 45 kbit/s | 48 kbit/s |
| -q0 | 64 kbit/s | |
| -q1 | 80 kbit/s | |
| -q2 | 96 kbit/s | |
| -q3 | 112 kbit/s | |
| -q4 | 128 kbit/s | |
| -q5 | 160 kbit/s | |
| -q6 | 192 kbit/s | |
| -q7 | 224 kbit/s | |
| -q8 | 256 kbit/s | |
| -q9 | 320 kbit/s | |
| -q10 | 500 kbit/s | |
Vorbis is intended for sample rates from 8 kHz telephony to 192 kHz digital masters and a range of channel representations (monaural, polyphonic, stereo, quadraphonic, 5.1, ambisonic, or up to 255 discrete channels). Given 44.1 kHz (standard CD audio sampling frequency) stereo input, the encoder will produce output from roughly 45 to 500 kbit/s (32 to 500 kbit/s for aoTuV tunings) depending on the specified quality setting. Quality setting goes from -0.1 to 1.0 for the Xiph library and -0.2 to 1.0 for aoTuV. Encoding front-ends map these values to an integer-based quality setting that goes from -1 to 10 for the Xiph library and -2 to 10 for aoTuV. Files encoded with a given quality setting should have the same quality of sound in all versions of the encoder, but newer versions should be able to achieve that quality with a lower bitrate. The bit rates mentioned above are only approximate; Vorbis is inherently variable-bitrate (VBR), so bitrate may vary considerably from sample to sample. (It is a free-form variable-bitrate codec and packets have no minimum size, maximum size, or fixed/expected size.)
Vorbis aims to be more efficient than MP3, with data compression transparency being available at lower bitrates.
Read more about this topic: Vorbis
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