Sonnox Fraunhofer Pro-Codec User Manual
Page 18
5.3 OnlineAuditioningandConfiguringCodecs
5 THE PRO-CODEC PLUG-IN
Some items may be marked with an asterisk to indicate that the setting will require some
form of resampling. Details will be shown in the lines at the bottom of the selector
panel.
Some combinations of bit rate, quality setting and sample rate might cause an encoder to
down-sample internally (especially at the highest quality settings). In this case, if the
stream is decoded for auditioning, the number of samples per second produced will not
match the session sample rate and there will be a pitch shift.
To work around this problem, when one of these special combinations is selected, the
plug-in creates two versions of the codec; one operating at lower quality for auditioning
(so that internal down-sampling does not take place), and one operating at the selected
quality, which will be used only for writing to file if the user drops into online record
mode.
In a 44.1 kHz session, selecting Highest quality for these codec settings will result in the encoded
output file having an internal sample rate of 48 kHz.
At higher session sample rates, the codec settings selector shows when down-sampling
is occurring. In this case, the input audio is down-sampled prior to encoding, to bring the
sample rate into the range supported by the codec. The decoded audition signal is
correspondingly up-sampled.
Note:
The encoded file’s sample rate is derived from the session sample rate, the codec
supported sample rate, 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. For more details, see section