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Comparing rips

I did an experiment and the results are mystifying to me. I ripped the same track with three different programs:

iTunes (error correction on)
dbpoweramp (free version) - AccurateRip verified
Exact Audio Copy - AccurateRip verified

I ripped them all to WAV.

iTunes and EAC returned the same number of bits (there are all "size on disk" numbers):
191,135,744

dbpoweramp returned a slightly larger file:
191,172,608

I then converted them to Apple Lossless files using the encoder in iTunes.

Again, two of the files matched the number of bits, but this time it was EAC and dbpoweramp!:
85,237,760

iTunes returned a different number:
71,892,990

I then ripped the track directly to Apple Lossless from dbpoweramp and dbpoweramp (EAC doesn't do this) and the results were as before:
iTunes: 71,892,990
dbpoweramp: 85,237,760

What is up with this? Has anyone seen these kind of results also?

Thanks for your help.
Mark
markhyams

Showing 1 response by dtc

dtc's avatar
dtc
1,047 posts
 
One thing to check out is the issue of drive offset numbers. If I remember correctly, iTunes gives you no control over the drive offset and EAC and dBpoweramp both do. When I played with this a while ago, once I got EAC and iTunes to use the same drive offset, then the WAV files compared exactly. If I remember correctly, I had to set it to 0 in EAC to get EAC and iTUnes to produce exactly the same files. Not sure if I compared dBpoweramp at that time. But it something to consider.
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