https://wiki.hydrogenaudio.org/api.php?action=feedcontributions&feedformat=atom&user=24.52.202.56 2026-04-30T15:05:32Z User contributions MediaWiki 1.44.2 https://wiki.hydrogenaudio.org/index.php?title=Apple_AAC&diff=23526 2012-10-17T02:44:00Z

<p>24.52.202.56: fixed spelling of &quot;proe&quot; to &quot;pro&quot;</p> <hr /> <div>'''QuickTime AAC''' is known to be one of the highest quality medium-bitrate [[CBR]] and [[VBR]] LC <br /> [[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]].<br /> <br /> Although this part of the commercial QuickTime Pro, VBR and CBR modes are available for free <br /> through [http://www.apple.com/itunes/ iTunes] (with a maximum [[sampling rate]] of 44.1khz for iTunes 10+ and 48khz for [http://www.oldapps.com/itunes.php?old_itunes=61 iTunes 9-])<br /> <br /> Free Third-party CLI 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 (&quot;constrained VBR&quot;)<br /> <br /> In recent tests for [http://listening-tests.hydrogenaudio.org/igorc/results.html 64kbps HE-AAC] and [http://listening-tests.hydrogenaudio.org/igorc/aac-96-a/results.html 96kbps LC-AAC] Quicktime has consistently come out near the top. This also applies to higher bitrates such as 128kbps and is likely to apply to higher bitrates such as 160kbps and beyond.<br /> <br /> In 2009, Quicktime was updated to 7.6 which [http://support.apple.com/kb/HT3292 &quot;Improves AAC encoding fidelity&quot;]. The bitrate distribution algorithm was also [http://forums.macrumors.com/showpost.php?p=6986639&amp;postcount=70 changed].<br /> <br /> ==External links==<br /> *[http://www.apple.com/quicktime Apple's Quicktime Website]<br /> <br /> {{stub}}</div>

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