Codec and encoded file sample rates, 3 codec and encoded file sample rates – Sonnox Fraunhofer Pro-Codec User Manual
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9.3 Codec Specifications
9 SPECIFICATIONS
Summary
These complications arise mostly when low sample rates (32 kHz) are combined with low
bit rate codecs; or when high sample rates are combined with high bit rates.
Generally Pro Tools, Logic, Cubase, and Nuendo are among the hosts that are immune to
this behaviour, but Sequoia, Samplitude and WaveLab are examples of hosts that can
exhibit these issues.
To avoid these problems after changing the session configuration, it is advisable when
using affected host applications to press
PLAY, then STOP, before instantiating the
plug-in or loading a plug-in preset.
This will ensure that session sample rate and channel configuration data are flushed
through the plug-in correctly.
It is also advisable to save presets for the plug-in at a variety of session sample rates and
channel configurations. It is advantageous to categorise the presets by channel
configuration and session sample rate.
9.3.3 Codec and Encoded File Sample Rates
The sample rate of an encoded file is derived from the session sample rate, the codec
supported sample rates, the selected codec bit rate, the selected codec quality setting
and the channel configuration. Hence, it is not a simple process to choose a desired
encoded file sample rate. The codec sample rate is shown in the codec settings
selector.
The following tables give examples of the encoded file sample rate that result from
various selection conditions (for full tables, see section
9.3.4 (Preferred Sample Rates)
).
The codecs have an internal
preferred sample rate, which will give the highest quality
reproduction (but, quite frequently, higher CPU usage).
In general, if the highest quality setting is selected for a codec, then the encoded file will
have the sample rate as listed in the
Preferred Sample Rate column (matching the
session sample rate, if this option is available).
In all other cases of quality setting, a codec uses the same sample rate as the session,
except at higher sample rate sessions when the codec will use the highest simple division
of the session sample rate that the codec supports.