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iTunes 5: AAC VBR? Better than default (ABR)?
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Professional Poster
Join Date: Oct 2002
Location: Off the Tobakoff
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So "VBR" is a new option in iTunes' AAC encoder, but is it better? Or is it just different?
Can someone please explain to me the difference between ABR and VBR results?
All Google searches provided LAME-specific explanations.
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"You rise," he said, "like Aurora." 
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Professional Poster
Join Date: Oct 2002
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This is the best explanation I could find:
Code:
CBR (constant bitrate) = variable quality / target: file size
ABR (average bitrate) = nearly constant quality / target: file size
VBR (variable bitrate) = constant quality / target: quality
Not sure what it means for iTunes' specific encoder. VBR-encoded files are still labeled "128kbps" (or the rate selected), but the files are bigger.
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"You rise," he said, "like Aurora."
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Mac Elite
Join Date: Feb 2003
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You can see the actual bitrate in Quicktime. The quality should be better while the filesizes will be somewhat unpredictable.
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Professional Poster
Join Date: Oct 2002
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Thanks, that was the impression I was getting, but it's good to get it verified.
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"You rise," he said, "like Aurora."
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Junior Member
Join Date: Feb 2002
Location: Atlanta
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Argh! Is it just me or is there no way to tell from within iTunes that a song is VBR? If so, that's a pretty silly oversight.
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Mac Elite
Join Date: Oct 2001
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Originally Posted by gheff
Argh! Is it just me or is there no way to tell from within iTunes that a song is VBR? If so, that's a pretty silly oversight.
It should say "(VBR)" next to the bitrate if a song has a variable bitrate.
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Genius. You know who.
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Addicted to MacNN
Join Date: Oct 2002
Location: Washington, DC
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Originally Posted by nforcer
It should say "(VBR)" next to the bitrate if a song has a variable bitrate.
It doesn't, from what I've read in the discussion on the HydrogenAudio forums. Actually, it seems like all this does is extend the range of the variation that was already being allowed in Apple's default AAC implementation. I'm not really sure that it is "true" VBR.
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Grizzled Veteran
Join Date: Jun 2001
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VBR encoded songs do indeed show "(VBR)" next to the bitrate — I'm looking at one right now.
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