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Why do "identical" files have different checksums?

 
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treefrog



Joined: 22 Nov 2006
Posts: 28
Location: Austria

PostPosted: Sun Feb 13, 2011 11:15 am    Post subject: Why do "identical" files have different checksums? Reply with quote

Just for fun I I did a test on how identical are two files when opened in APro and "saved as" again, with no changes applied. I tested the same with Peak Pro 6.

The two AIFF (uncompressed, 24*96) files' checksums are NOT IDENTICAL. This worries me a bit.

Can the reason be that the original file was saved on an earlier OSX?
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Sun Feb 13, 2011 2:44 pm    Post subject: Why do "identical" files have different checksums? Reply with quote

Try reading them both in, flipping them and adding them and see what
happens. Remember, there is more than data in each file.

Chuck

On 2/13/11 5:15 AM, treefrog wrote:
Quote:
Just for fun I I did a test on how identical are two files when opened in APro and "saved as" again, with no changes applied. I tested the same with Peak Pro 6.

The two AIFF (uncompressed, 24*96) files' checksums are NOT IDENTICAL. This worries me a bit.

Can the reason be that the original file was saved on an earlier OSX?




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Martin Hairer
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Joined: 08 Nov 2006
Posts: 1615

PostPosted: Sun Feb 13, 2011 3:17 pm    Post subject: Why do "identical" files have different checksums? Reply with quote

Sound data will be identical (unless it was compressed to start with).
Although metadata will also be identical in general, there can be small
differences in character encodings, etc, thus messing up the checksum.
Regards,

Martin

HairerSoft
http://www.hairersoft.com/


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