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itunes added samples? please help
matth6546
post Oct 27 2004, 02:00
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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'?
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rjamorim
post Oct 27 2004, 02:11
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QUOTE (matth6546 @ Oct 26 2004, 10:00 PM)
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'?
*


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.


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Get up-to-date binaries of Lame, AAC, Vorbis and much more at RareWares:
http://www.rarewares.org
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matth6546
post Oct 27 2004, 14:33
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i see. thanks.
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