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Canít get same CRC when I burn/re-rip it. Due to absence of cue-sheet?, Was: Rip, Burn, Rip and CRC (TOS #6/unclear)
eahm
post Feb 11 2012, 19:29
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Hello again guys, I must ask another question again even though only few hours passed from my previous one.

I've did may simple test and none of them worked, I may know why it still not working but I need to hear from an expert.

Here's my problem:

Original CD Audio -> Rip to FLAC = Correct rip with AccurateRip. When I calculate the CRC/MD5 with dBpoweramp it gives me the same CRC for every lossless rip test I do with that very same track.

It seems though that I can't get the same CRC when I burn the track and re rip it. 1) Is my problem the absence of CUE files? 2) Does the track re rip correctly only if I burn it from the CUE file? 3) Is there a way to make a perfect burn without the CUE file? I've tried every possible burning software, burrrn, dBpoweramp, EAC etc.

Thank you again guys.
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eahm
post Feb 13 2012, 19:48
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QUOTE (pdq @ Feb 13 2012, 10:12) *
Open EAC, click on Tools->Compare WAVs, select one version of the track, select the second version of the track, tell us what you see.

Open Retail first then open CD-R = 6 missing samples. Enter -6 on CD Write Offset = the CRC is wrong when I rerip.

QUOTE (JunkieXL @ Feb 13 2012, 11:07) *
I have done the same thing you are testing. I was never able to get the resulting CRC's to match and I had the read and write offsets set up correctly. I even did a digital to digital rip using a virtual drive.

There are just far too many variables that can slightly offset the data to get an exact matching CRC/MD5 sum. I posted a similar thread several years back when I discovered this. The end result of said thread... don't worry about it. It's as close as it is going to get and any difference will be so minimal that you would not be able to know it anyways. Except said CRC/MD5 sum.
JXL

I understand what you mean, it's probably nothing to worry about. I am going to tell you something else, I've already wasted at least 10 CD-Rs to do testing and you know what? I don't even listen to music using CDs, I want to see the correct CRC when I rerip and I will be done testing. I want to see it at least once.


Again, I need answers here:

1) Does the writing speed influence the quality of the writing? I've read it does but how do I test all the speeds without throwing away 2000 CD-Rs? Are CD-RW good for tests and quality burning?

2) Once I set the write offset do I have to burn the full disc or just one song to rerip and test?

3) If one song is not enough (on question 2), does the CUE file make a difference when I burn the full album for the rerip's CRC?



Thanks.

This post has been edited by eahm: Feb 13 2012, 19:48
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psycho
post Feb 16 2012, 18:43
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QUOTE (eahm @ Feb 13 2012, 19:48) *
...I want to see the correct CRC when I rerip and I will be done testing. I want to see it at least once...


OK, do this:

1) Set your read offset in EAC (in my case +102).
2) RIP some retail CD - the whole thing - all tracks!
3) Burn the whole thing - all tracks! - to CD-R(W) with write offset set to 0!
4) RIP the CD-R(W) you have just created.
5) Compare one of the tracks from the folder of the retail RIP with the same numbered track from the CD-R(W) folder of the second RIP.
6) Set the write offset accordingly (missing samples from 5) mean -samples, repeated samples from 5) mean +samples) (in my case +30).
7) Write the files from RETAIL RIP folder again on CD-R(W).
8) RIP the 2nd recorded CD-R(W).
9) CRCs between RETAIL RIP and the last CD-R(W) RIP must match!

I've done it one more time, just to be sure that I give you exact instructions... it just works, but you must follow instructions.
My drive: HL-DT-STDVDRRW GSA-H30L S856

This post has been edited by psycho: Feb 16 2012, 18:46


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Posts in this topic
- eahm   Canít get same CRC when I burn/re-rip it. Due to absence of cue-sheet?   Feb 11 2012, 19:29
- - psycho   Your problem comes from reading and more important...   Feb 11 2012, 19:36
- - eahm   I thought the CUE file was going to be the problem...   Feb 11 2012, 20:01
- - eahm   I am reading this guide http://blowfish.be/eac/Bur...   Feb 11 2012, 20:20
- - pdq   It would make more sense to compare the audio data...   Feb 11 2012, 20:55
- - eahm   What do you mean? That WAV Compare test I did is f...   Feb 11 2012, 21:02
- - pdq   Sorry, I only saw your mention of CRC and didn...   Feb 11 2012, 22:07
- - eahm   Please look at the attached screenshots, there is ...   Feb 11 2012, 23:23
- - eahm   You've got to be kidding me. The write offset ...   Feb 12 2012, 04:55
- - eahm   I did calculate the write offset and it supposed t...   Feb 12 2012, 06:53
- - pdq   You should really stop relying on CRC. If even a s...   Feb 12 2012, 14:06
- - Bugs.Bunny   If you do want a bit exact copy you will need 2 th...   Feb 12 2012, 15:05
- - eahm   QUOTE (pdq @ Feb 12 2012, 06:06) You shou...   Feb 12 2012, 19:36
- - pdq   Your CRCs don't match. You don't know why ...   Feb 13 2012, 05:09
- - eahm   QUOTE (pdq @ Feb 12 2012, 21:09) Your CRC...   Feb 13 2012, 06:59
- - pdq   Open EAC, click on Tools->Compare WAVs, select ...   Feb 13 2012, 18:12
- - JunkieXL   I have done the same thing you are testing. I was...   Feb 13 2012, 19:07
- - eahm   QUOTE (pdq @ Feb 13 2012, 10:12) Open EAC...   Feb 13 2012, 19:48
|- - psycho   QUOTE (eahm @ Feb 13 2012, 19:48) ...I wa...   Feb 16 2012, 18:43
|- - psycho   QUOTE (eahm @ Feb 13 2012, 19:48) Again, ...   Feb 16 2012, 19:07
- - pdq   Are the six missing samples at the beginning or th...   Feb 13 2012, 19:59
- - eahm   QUOTE (pdq @ Feb 13 2012, 11:59) Are the ...   Feb 13 2012, 20:14
- - pdq   The example shows the missing samples to be at the...   Feb 13 2012, 20:28
- - Bugs.Bunny   Offset (read or write) results in loosing some dat...   Feb 13 2012, 21:32
- - pablogm123   "There are (as far as I know) no drives with ...   Feb 16 2012, 11:17
- - db1989   That depends. If one follows the meticulously hard...   Feb 16 2012, 11:26
- - eahm   QUOTE (db1989 @ Feb 16 2012, 03:26) That ...   Feb 16 2012, 18:38
- - greynol   I'm pretty certain the answer to your question...   Feb 16 2012, 18:41
- - greynol   ...or you can burn an offset test CD with the writ...   Feb 16 2012, 18:57


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