Apple AAC

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QuickTime AAC is known to be one of the highest quality medium-bitrate CBR and VBR LC AAC encoders and is also another commercial AAC implementation. The current version of QUicktime supports Multichannel encoding up to 8 channels, and HE-AAC v1 with SBR.

Although this is a comercial implementation and part of the QuickTime Pro package, VBR and CBR modes (with a maximum sampling rate of 44.1khz for iTunes 10+ and 48khz for iTunes 9-) are available for free through iTunes

Third-party interfaces such as qAAC expose more modes such as TVBR (equivalent to quality modes in other encoders) and CVBR ("constrained VBR")

Multichannel channel mapping is buggy but can be remedies by installing an olvder version of Quicktime (7.68-)

More information can be found at the Apple Quicktime Website

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