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Thread: CRC Missmatch

  1. #1

    CRC Missmatch

    Being a newbie with EAC and AR I have been testing and reading quite a lot but still I cannot really understand why in this log (Action-->Test & Copy Selected Tracks) for instance the CRC C73B6BF9 returned by the test and the copy does not match the CRC 011D1B79 from the AR database?

    However with a confidence of 112 I can be pretty sure that it's an accurate rip. :D (For testing purposes I used a best seller CD but for many others there is absolutely nothing in de AR database... :cry: )

    Code:
    Exact Audio Copy V0.99 prebeta 4 from 23. January 2008
    
    EAC extraction logfile from 30. September 2008, 21:53
    
    Phil Collins / Dance Into the Light
    
    Used drive  : LITE-ON DVDRW LH-20A1H   Adapter: 0  ID: 0
    
    Read mode               : Secure
    Utilize accurate stream : Yes
    Defeat audio cache      : Yes
    Make use of C2 pointers : Yes
    
    Read offset correction                      : 6
    Overread into Lead-In and Lead-Out          : Yes
    Fill up missing offset samples with silence : Yes
    Delete leading and trailing silent blocks   : No
    Null samples used in CRC calculations       : No
    Used interface                              : Installed external ASPI interface
    Gap handling                                : Not detected, thus appended to previous track
    
    Used output format : Internal WAV Routines
    Sample format      : 44.100 Hz; 16 Bit; Stereo
    
    
    TOC of the extracted CD
    
         Track |   Start  |  Length  | Start sector | End sector 
        ---------------------------------------------------------
            1  |  0:00.00 |  4:24.00 |         0    |    19799   
            2  |  4:24.00 |  4:20.72 |     19800    |    39371   
            3  |  8:44.72 |  5:52.38 |     39372    |    65809   
            4  | 14:37.35 |  6:25.00 |     65810    |    94684   
            5  | 21:02.35 |  4:11.00 |     94685    |   113509   
            6  | 25:13.35 |  4:44.00 |    113510    |   134809   
            7  | 29:57.35 |  3:02.72 |    134810    |   148531   
            8  | 33:00.32 |  5:30.40 |    148532    |   173321   
            9  | 38:30.72 |  3:27.00 |    173322    |   188846   
           10  | 41:57.72 |  4:09.58 |    188847    |   207579   
           11  | 46:07.55 |  4:57.00 |    207580    |   229854   
           12  | 51:04.55 |  4:40.47 |    229855    |   250901   
           13  | 55:45.27 |  5:08.03 |    250902    |   274004   
    
    
    Track  9
    
         Filename U:\Take Me Down.wav
    
         Peak level 97.9 %
         Track quality 100.0 %
         Test CRC C73B6BF9
         Copy CRC C73B6BF9
         Accurately ripped (confidence 112)  [011D1B79]
         Copy OK
    
    
    All tracks accurately ripped
    
    No errors occurred
    
    End of status report
    Furthermore I generated also following log 2 minutes before (by using Action-->Catalog Selected Tracks-->Uncompressed...):

    Code:
    Exact Audio Copy V0.99 prebeta 4 from 23. January 2008
    
    EAC extraction logfile from 30. September 2008, 21:51
    
    Phil Collins / Dance Into the Light
    
    Used drive  : LITE-ON DVDRW LH-20A1H   Adapter: 0  ID: 0
    
    Read mode               : Secure
    Utilize accurate stream : Yes
    Defeat audio cache      : Yes
    Make use of C2 pointers : Yes
    
    Read offset correction                      : 6
    Overread into Lead-In and Lead-Out          : Yes
    Fill up missing offset samples with silence : Yes
    Delete leading and trailing silent blocks   : No
    Null samples used in CRC calculations       : No
    Used interface                              : Installed external ASPI interface
    Gap handling                                : Not detected, thus appended to previous track
    
    Used output format : Internal WAV Routines
    Sample format      : 44.100 Hz; 16 Bit; Stereo
    
    
    TOC of the extracted CD
    
         Track |   Start  |  Length  | Start sector | End sector 
        ---------------------------------------------------------
            1  |  0:00.00 |  4:24.00 |         0    |    19799   
            2  |  4:24.00 |  4:20.72 |     19800    |    39371   
            3  |  8:44.72 |  5:52.38 |     39372    |    65809   
            4  | 14:37.35 |  6:25.00 |     65810    |    94684   
            5  | 21:02.35 |  4:11.00 |     94685    |   113509   
            6  | 25:13.35 |  4:44.00 |    113510    |   134809   
            7  | 29:57.35 |  3:02.72 |    134810    |   148531   
            8  | 33:00.32 |  5:30.40 |    148532    |   173321   
            9  | 38:30.72 |  3:27.00 |    173322    |   188846   
           10  | 41:57.72 |  4:09.58 |    188847    |   207579   
           11  | 46:07.55 |  4:57.00 |    207580    |   229854   
           12  | 51:04.55 |  4:40.47 |    229855    |   250901   
           13  | 55:45.27 |  5:08.03 |    250902    |   274004   
    
    
    Track  9
    
         Filename U:\Take Me Down.wav
    
         Peak level 97.9 %
         Track quality 100.0 %
         Copy CRC DB023024
         Copy OK
    
    No errors occurred
    
    End of status report
    Why is the CRD DB023024 different here?

    Thanks a lot for your replies!

  2. #2
    dBpoweramp Guru
    Join Date
    Feb 2007
    Posts
    793

    Re: CRC Missmatch

    Quote Originally Posted by BlueDragon View Post
    I cannot really understand why in this log (Action-->Test & Copy Selected Tracks) for instance the CRC C73B6BF9 returned by the test and the copy does not match the CRC 011D1B79 from the AR database?
    AFAIK, AccurateRip deletes a little bit from the beginning and end before calculating the CRC -- in order to, I guess, eliminate drive-specific idiosyncracies.

  3. #3
    dBpoweramp Guru LtData's Avatar
    Join Date
    May 2004
    Location
    USA
    Posts
    8,333

    Re: CRC Missmatch

    AccurateRip and EAC determine the CRCs differently.

  4. #4

    Re: CRC Missmatch

    Quote Originally Posted by LtData View Post
    AccurateRip and EAC determine the CRCs differently.
    Ok so if that is the case then there must also be other CRC entries for each track and maybe for each software (EAC or dbpoweramp) in the AR database!? Otherwise how could AR know that the tracks were accurately ripped?

    Hmmm... not very transparent the whole process... :(

  5. #5
    dBpoweramp Guru LtData's Avatar
    Join Date
    May 2004
    Location
    USA
    Posts
    8,333

    Re: CRC Missmatch

    The AR CRCs are the same, whether EAC or dMC are used.

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