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 26 2009, 14:54
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#2
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Group: Members Posts: 231 Joined: 6-April 09 Member No.: 68706 |
Silent data corruption.
I verify my music collection once in a while. I had to resign from using WavPack because it took way too long. I'm considering switching to TAK as soon as there's 2.0, but I'm wondering if verification time won't make it inapplicable too. |
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Oct 26 2009, 15:15
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#3
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Group: Developer Posts: 1126 Joined: 11-February 03 From: Germany Member No.: 4961 |
Verification time should be disk-bound. I don't think that what you are asking for would change anything, if you're not running a 386.
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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 odyssey What is your goal? You don't need to decode an... Oct 25 2009, 22:28 _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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