[M4IF Technotes] Looking for HE AAC test software / AAC-LC

[Hans-Juergen Bardenhagen]

On Friday, 20.06.03, 11:48 (received 20.06.03, 21:16) Dave Singer wrote:
> I must confess to being a little confused.  We're a VBR codec
> naturally;  but we do try to track the requested data rate fairly
> closely.

As far as I know, this is only possible by using a bit reservoir with a  
size within defined limits (i.e. CBR and/or ABR with larger reservoir)  
and not by allowing the codec to allocate the necessary bits only  
according to the psymodel (i.e. VBR) while not paying attention to any  
bit reservoir limit. But it's possible that I have a wrong idea of these  
differences between CBR and VBR, because I only read about them e.g.  
from the Nero AAC developer.
>  Why that would give us an advantage, I am not sure...

I'm not sure either, because we wondered why QuickTime also encodes  
silence with the desired bitrate, e.g. 128 kbps/stereo. But one thing is  
for sure: it can't be that wrong regarding the outcome of the listening  
test.
By the way, is it true that the AAC codec in QuickTime 6.3 has been  
updated quite a lot regarding its sound quality, and is it still based  
on the Dolby AAC consumer version? And could you tell us which version  
of the AAC codec is implemented in iTunes 4.01 and with which quality  
setting compared to QuickTime 6.3?
ZZee ya, Hans-Jürgen