Why checksum uncompressed audio? |
Why checksum uncompressed audio? |
 Oct 25 2009, 08:06
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#1
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Group: Members Posts: 231 Joined: 6-April 09 Member No.: 68706  |
FLAC and Wavpack (likely others too) use error detection codes for uncompressed audio data.
Why not for compressed? I could find only 2 differences: -you have to decompress the data to verify correctness, which (sometimes greatly) reduces verification performance -you have more data to be checksumed, which slightly reduces compression / verification performance What am I missing? |
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Oct 25 2009, 22:28
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#2
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 Group: Members Posts: 2296 Joined: 18-May 03 From: Denmark Member No.: 6695 |
What is your goal? You don't need to decode and verify your files every now and then. If you ask me both a checksum of encoded and decoded audio is somewhat useless if you have no reference. AccurateRip is a large database that provides the ability to verify CD-rips using checksums. With CUEtools you can even store verification results to tags.
-------------------- Can't wait for a HD-AAC encoder :P
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_mē_ Why checksum uncompressed audio? Oct 25 2009, 08:06
stigc The checksum is meant to proof that the decoded da... Oct 25 2009, 09:12
_mē_ QUOTE (stigc @ Oct 25 2009, 09:12) The ch... Oct 25 2009, 16:53 kjoonlee FLAC does store the checksum of the whole audio da... Oct 25 2009, 18:05 Bylie WavPack by default uses blockbased CRC's and, ... Oct 25 2009, 19:18 _mē_ OK, now I get it.
I didn't know that there are... Oct 25 2009, 21:35 _mē_ Silent data corruption.
I verify my music collecti... Oct 26 2009, 14:54 rpp3po Verification time should be disk-bound. I don... Oct 26 2009, 15:15 _mē_ If it was disk bound, FLAC and WavPack would have ... Oct 26 2009, 17:17 rpp3po Just checked an old comparison. Wavpack 4 really o... Oct 26 2009, 17:48 |
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