Fixed bit-rate varies from song to song

after importing a cd (bit-rate set to 256 kpbs (stereo), 48 000 kHz, NOT checked the Use Variable Bit Rate Encoding box) i see thet the songs have been imported with bit-rates that change from song to song (like first song 258 kbps, second - 257 kbps, third - 251, fourth - 237 and so on).
could anyone please explain why so?
thanks in advance!

thenewdawg wrote:
Thanks for the thread, though it's an iTunes for Windows thread. Any info. for Mac?
Meg is correct, the issue is not specific to Windows, it is specific to QuickTime 7.3, on both platforms.
After reading through the thread, and others that it points to, I get the impression that the changes are supposed to be improvements. And probably are for the majority of people.
On the other hand, there are a number of specific cases where the new behavior is actually a problem. If you're using Doug Adams's excellent Join Together script (http://dougscripts.com/itunes/scripts/ss.php?sp=jointogether), with varying bitrates between tracks, you can no longer use the Pass-Through option, which means that the script can take much, much longer to complete.
And I've gotten reports from some people that at low bit rates, e.g., 64kbps and lower, imports using QuickTime 7.3 have some kind of static noise, that is not there when the same disc is imported / transcoded with QuickTime 7.2. So I think there are some software defects to work out, too.

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Sid,
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(67928)

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crichton007 wrote:
What I may do is start a brand new library there, copy my tracks from my work laptop using Home Share and then the script to get things in sync before starting over again there too.
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crichton007 wrote:
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ed2345 wrote:
malus_domestica wrote:
Thanks for the response.
So, I am wondering why iTunes uses only 8% of the processor power in converting the songs.
Possible reasons not to grab more of the CPU power (1) maybe the process is I/O bound due to all the writing, and is not processor limited? (2) since conversion is almost always a background program, and the user will typically have other things going on, maybe it intentionally limits CPU use?
I ran a few quick experiments (out of curiosity) and think the answer is #2. No apparent technical reason but potentially a limitation introduced by Apple's engineers to maintain a good user experience (for some people at least). I fired up 4 instances of dbpoweramp and ran multiple conversions and found that the process goes faster than what iTunes can do by an order of magnitude. With luck, someday Apple will have an option for users to select how much of processor bandwidth to be allocated for the conversion.

Fixed bit-rate varies from song to song

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