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itunes added samples? please help

ok, i just ABXed Megadeth - Good Mourning/Black Friday (remaster) with foobar. i converted the original wav once with foobar, using nero aac @ 192kbps CBR and once with itunes 4.7.042 (just came out) @ 192kbps CBR. i couldn't tell the difference between the two with ABX, so i checked their properties to find a difference.

here's what i found:
wav
length: 6:39.773
samples: 17,630,004

foobar
length: 6:39.773
samples: 17,630,004
size: 9,720,300 bytes

itunes
length: 6:39.801
samples: 17,631,232
size: 9,751,127

maybe this is a normal thing, but the itunes converted file has more samples than the original file and has a slightly longer duration. i found this odd because it looks like itunes added something to the file. is this normal or did i just make a 'discovery'?

itunes added samples? please help

Reply #1
Quote
maybe this is a normal thing, but the itunes converted file has more samples than the original file and has a slightly longer duration. i found this odd because it looks like itunes added something to the file. is this normal or did i just make a 'discovery'?
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It is normal. iTunes AAC isn't gapless. Those added samples are the gap introduced because AAC is a block-based codec (blocks have a fixed size, so often at the end of the track it's padded with zeros to complete the data needed to create a block) and iTunes doesn't compensate for that, unlike MPC and Vorbis.

itunes added samples? please help

Reply #2
i see. thanks.

 
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