Apple AAC: Difference between revisions

Revision as of 06:14, 17 September 2011

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

This article is a stub. You can help the Hydrogenaudio Knowledgebase by expanding it.

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-'''QuickTime AAC''' is known to be one of the highest quality medium-bitrate [[CBR]] LC
+'''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. Whilst the current version only supports 2 channel audio, it is hoped multi-channel support, along with
+[[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]].
-[[VBR]] encoding will be added in a future version.
-Although this is a comercial implementation and part of the QuickTime Pro package, the codec is available for free
+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 the [http://www.apple.com/itunes/ iTunes Digital Jukebox]
+through [http://www.apple.com/itunes/ iTunes ]
-Update: It is rumored that the next major version of Apple's codec (included in iTunes 5.0, as a part of iLife 5.0 in Mac OSX Tiger to be released early in 2005) will support AAC HE & [[VBR]] encoding.
+Third-party interfaces such as [http://sites.google.com/site/qaacpage/ qAAC] expose more modes such as TVBR (equivalent to quality modes in other encoders) and CVBR ("constrained VBR")
-More information can be found at the [http://www.apple.com/mpeg4/aac/ Apple Website]
+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 [http://www.apple.com/quicktime Apple Quicktime Website]
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