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Quality Factor

A decimal float value for the quality setting of the compressed file where -2 is intended as an ultra-low setting in which low bitrate is much more important than quality consistency and 0.0 is intended to produce consistent results at all times.

A higher quality setting translates into:

The Vorbis variable rate codec will keep the encoding quality value that you specify constant while varying the bitrate. A high compression rate can result in reduced quality. To achieve a higher quality, and therefore a lower compression rate, select a value close to the top range.

Default value: +4
Range: -2 to +10

The Vorbis decoder will take approximately 24 KB of the lower engine memory for each stereo file encoded in a quality setting less than 0.

Managed Bitrate

Enables the functionality for managing the average as well as the minimum and maximum bitrates per channel.

Although the Vorbis codec is natively variable bitrate codec, it includes infrastructure for 'managing' the bitrate of streams by setting minimum and maximum usage constraints, as well as functionality for nudging a stream toward a desired average value. These features should only be used when there is a requirement to limit bitrate in some way, such as guaranteeing certain bandwidth limitations for file streaming. Although the difference is usually slight, managed bitrate modes will always produce output inferior to variable bitrate encodings (given equal bitrate usage).

	Note
	Note that setting overly or impossibly tight bitrate management requirements can affect output quality dramatically for the worse.

Average bitrate (kbps per channel)

The value of the average bitrate that will be used by the bitrate reservoir as a set-point for tracking the bitrate in the encoder.

Default value: 64
Range: 16 to 240
Units: kbps per channel

Min bitrate (kbps per channel)

The minimum bitrate per channel encoded.

Default value: 64
Range: 16 to 240
Units: kbps per channel

The Vorbis codec supports limited ranges of valid bitrate settings depending on the sample rate of the file to encode. For more information about the valid ranges, consult the Valid Vorbis Bitrate Settings.

Max bitrate (kbps per channel)

The maximum bitrate per encoded channel.

Default value: 64
Range: 16 to 240
Units: kbps per channel

The Vorbis codec supports limited ranges of valid bitrate settings depending on the sample rate of the file to encode. For more information about the valid ranges, consult the Valid Vorbis Bitrate Settings.

Advanced Settings

Enables the functionality for managing the reservoir settings.

This functionality should only be used by users with expertise in encoding.

Bit reservoir time

The minimum/maximum bitrate constraints that will be used in the bit tracking reservoir. The reservoir averages out localized surges and dips in bitrates by managing the frame size and banking bits within the range defined for this setting.

Default value: 2
Range: 0 to 10
Units: seconds

Reservoir bias factor

The setting that determines how the reservoir will manage banking of bits - a higher setting results in the reservoir hoarding bits so that there are many to draw on should the bitrate go down. A lower setting results in storing less bits to deal with bitrate changes.

Default value: 0.1
Range: 0 to 1

Average track slew time

The transition time before the reservoir tracker will respond to defined minimum and maximum bitrate times.

Default value: 1.5
Range: 0 to 10
Units: seconds

Seek table granularity (sample frames)

The settings that determine how many seek locations or key frames will be used in the audio file. The seek table is normally used for virtual voice sounds that use the Play from elapsed time option. The lower the settings, the closer the sound will be to the accurate elapsed time for the sound.

Default: 16,384
Range: 1,024 to 32,768
Units: PCM frames (each frame is 1/sample frequency)

Closes the Vorbis Encoder Parameters dialog and saves your settings.

Closes the Vorbis Encoder Parameters dialog without saving your settings.