According to the installer:
What's new in QuickTime 6.5.1
QuickTime 6.5.1 delivers many important updates, including:
• Significant improvements to AAC encoding, resulting in high-quality sound over a full range of audio frequencies.
This is in addition to the "lossless" encoder. Does anyone know what they did to improve the encoding?
Full Version: Quicktime 6.5.1 claims improved AAC encoding
Firts thing to do is bit compare old and new Quicktime encondings. Those marketing talk won't tell realy anything important.
QUOTE(melican @ Apr 28 2004, 04:42 PM)
high-quality sound over a full range of audio frequencies.
What does that mean? "Tonal purity" with Apple AAC?
64 Kb/s mode finally uses short blocks 
This sometimes improves and somethimes makes sound worse - but at least it works like all other non-Dolby AAC encoders at that bit rate
This sometimes improves and somethimes makes sound worse - but at least it works like all other non-Dolby AAC encoders at that bit rate
Check this thread/post for more informations. Apparently they allow more high frequencies in the new encoder.
I wonder if they're going to re encode their entire iTMS music library with the new encoder 
Is the new lossless codec supplied with the latest version of quick time pro? I couldn't see it when I upgraded 
QUOTE(Tomb @ Apr 29 2004, 12:16 PM)
Is the new lossless codec supplied with the latest version of quick time pro? I couldn't see it when I upgraded
Apple's Quicktime page. It is mentioned as the last item under "What's New In Quicktime 6.5?"
QUOTE(Tomb @ Apr 29 2004, 01:16 PM)
Is the new lossless codec supplied with the latest version of quick time pro? I couldn't see it when I upgraded
It appears when you select export to Quicktime movie, instead of MPEG4.
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