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CRC Check Questions - 3/7/2005 8:12:24 AM   
Pyromite

 

Posts: 1
Joined: 3/3/2005
Status: offline
Hi,

I have a few questions about the CRC check module in DVDInfopro.

First, I understand that the red blocks indicate there are CRC errors in data blocks on the disc being tested, but I am wondering what manifestations one can expect with playback. I have noticed that one or two red blocks on a disc have not demonstrated any appreciable playback problems, but when I have several, especially several in a row, there seems to be a jumping, skipping or freeze in playback. Is it accurate to say that a few red blocks will not affect playback in a noticeable manner? Or have I just been lucky with the discs that have only a few red blocks?

Also, I have noticed that some red blocks appear quickly, without a test on individual blocks being performed, while others appear after a long test of individual blocks? What differences is there between those two red blocks? Or is there?
Post #: 1
RE: CRC Check Questions - 3/7/2005 5:08:57 PM   
zebra


Posts: 225
Joined: 6/20/2004
From: .:Australia:.
Status: offline
You ask a very interesting question! Good!

i. When a block turns RED, it is indicative of a hash fail. Repeated re-reading of the block indicate that the sector cannot be read by the specific drive you are reading it with. Notice I mention the specific drive. Any given drive may have differing readback characteristics. (Example, your LiteOn DVD-ROM might see red blocks, your NEC might see green blocks - and your player might think everything is fine (green blocks).

ii. When you say one or two blocks does not seem to count towards choppy playback, you are seeing this in a subjective light. The human eye is not as accurate as a mathematical algorithm, designed to detect hash-fails/ CRC fails. When the errors amount to a greater number of RED errors, logically, the human eye will begin to see the manifestation of these problems. Know what I mean?

iii. The blocks appear at different speeds of detection based upon how difficult it is for the drive to read/fail/read/fail on the specific block. Individual block testing mode is entered into when a hash fails. White blocks indicate the 2nd try on reading of the block was successful. Green indicates a first-parse success. Red is uncorrectable.

For a more objective measurement of "quality" of the burn, try the PI/PO/Jitter tests, in the top menu.

Helps?


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(in reply to Pyromite)
Post #: 2
RE: CRC Check Questions - 3/24/2005 8:28:03 AM   
seabird

 

Posts: 4
Joined: 3/24/2005
Status: offline
Well, I understand this all, but this still leaves me with a problem... what to do next? I have movie made by a friend who unfortunatly is no longer among the living. The burned copy that I have has several red blocks. I don't mind losing those few blocks if I can recover the rest of the file. How to do this??? so far, everyprogram I try freezes on those blocks (first one is at aprox. 4 minutes out of 55 min movie.) and the check function actually came up with 134 errors.....

Drive - TSSTCORPCD/DVDW TS-L532A
Media ID Code -
Media Type - CD-R
Read Error list
1. Error - LBA = 0000574eh
2. Error - LBA = 0000574fh
3. Error - LBA = 00005750h
4. Error - LBA = 00010716h
5. Error - LBA = 00010717h
6. Error - LBA = 00010718h
7. Error - LBA = 00011f5dh
8. Error - LBA = 00011f5eh
9. Error - LBA = 00011f5fh
10. Error - LBA = 00011f60h
11. Error - LBA = 00013640h
12. Error - LBA = 00013641h
13. Error - LBA = 00013642h
14. Error - LBA = 000149deh
15. Error - LBA = 000149dfh
16. Error - LBA = 000149e0h
17. Error - LBA = 00015e03h
18. Error - LBA = 00015e04h
19. Error - LBA = 00015e05h
20. Error - LBA = 0001716bh
21. Error - LBA = 0001716ch
22. Error - LBA = 0001716dh
23. Error - LBA = 00018509h
24. Error - LBA = 0001850ah
25. Error - LBA = 0001850bh
26. Error - LBA = 00019871h
27. Error - LBA = 00019872h
28. Error - LBA = 00019873h
29. Error - LBA = 0001ac2ah
30. Error - LBA = 0001ac2bh
31. Error - LBA = 0001ac2ch
32. Error - LBA = 0001bf0bh
33. Error - LBA = 0001bf0ch
34. Error - LBA = 0001bf0dh
35. Error - LBA = 0001d2dfh
36. Error - LBA = 0001d2e0h
37. Error - LBA = 0001d2e1h
38. Error - LBA = 0001e6e9h
39. Error - LBA = 0001e6eah
40. Error - LBA = 0001e6ebh
41. Error - LBA = 0001fabdh
42. Error - LBA = 0001fabeh
43. Error - LBA = 0001fabfh
44. Error - LBA = 00020ee2h
45. Error - LBA = 00020ee3h
46. Error - LBA = 00020ee4h
47. Error - LBA = 0002229bh
48. Error - LBA = 0002229ch
49. Error - LBA = 0002229dh
50. Error - LBA = 000236a5h
51. Error - LBA = 000236a6h
52. Error - LBA = 000236a7h
53. Error - LBA = 00024a5eh
54. Error - LBA = 00024a5fh
55. Error - LBA = 00024a60h
56. Error - LBA = 00025e9eh
57. Error - LBA = 00025e9fh
58. Error - LBA = 00025ea0h
59. Error - LBA = 00027206h
60. Error - LBA = 00027207h
61. Error - LBA = 00027208h
62. Error - LBA = 000288b3h
63. Error - LBA = 000288b4h
64. Error - LBA = 000288b5h
65. Error - LBA = 00029c00h
66. Error - LBA = 00029c01h
67. Error - LBA = 00029c02h
68. Error - LBA = 0002afefh
69. Error - LBA = 0002aff0h
70. Error - LBA = 0002aff1h
71. Error - LBA = 0002c3a8h
72. Error - LBA = 0002c3a9h
73. Error - LBA = 0002c3aah
74. Error - LBA = 0002d6f5h
75. Error - LBA = 0002d6f6h
76. Error - LBA = 0002d6f7h
77. Error - LBA = 0002ea27h
78. Error - LBA = 0002ea28h
79. Error - LBA = 0002ea29h
80. Error - LBA = 00030125h
81. Error - LBA = 00030126h
82. Error - LBA = 00030127h
83. Error - LBA = 000314deh
84. Error - LBA = 000314dfh
85. Error - LBA = 000314e0h
86. Error - LBA = 00032810h
87. Error - LBA = 00032811h
88. Error - LBA = 00032812h
89. Error - LBA = 00033b0ch
90. Error - LBA = 00033b0dh
91. Error - LBA = 00033b0eh
92. Error - LBA = 00034e59h
93. Error - LBA = 00034e5ah
94. Error - LBA = 00034e5bh
95. Error - LBA = 00036263h
96. Error - LBA = 00036264h
97. Error - LBA = 00036265h
98. Error - LBA = 00036266h
99. Error - LBA = 00037889h
100. Error - LBA = 0003788ah
101. Error - LBA = 0003788bh
102. Error - LBA = 00038ee5h
103. Error - LBA = 00038ee6h
104. Error - LBA = 00038ee7h
105. Error - LBA = 0003a1abh
106. Error - LBA = 0003a1ach
107. Error - LBA = 0003a1adh
108. Error - LBA = 0003b822h
109. Error - LBA = 0003b823h
110. Error - LBA = 0003b824h
111. Error - LBA = 0003cb39h
112. Error - LBA = 0003cb3ah
113. Error - LBA = 0003cb3bh
114. Error - LBA = 0003dde4h
115. Error - LBA = 0003dde5h
116. Error - LBA = 0003dde6h
117. Error - LBA = 0003f4fdh
118. Error - LBA = 0003f4feh
119. Error - LBA = 0003f4ffh
120. Error - LBA = 00040814h
121. Error - LBA = 00040815h
122. Error - LBA = 00040816h
123. Error - LBA = 00041b7ch
124. Error - LBA = 00041b7dh
125. Error - LBA = 00041b7eh
126. Error - LBA = 00042e93h
127. Error - LBA = 00042e94h
128. Error - LBA = 00042e95h
129. Error - LBA = 0004418fh
130. Error - LBA = 00044190h
131. Error - LBA = 00044191h
132. Error - LBA = 0004557eh
133. Error - LBA = 0004557fh
134. Error - LBA = 00045580h


Now what??

(in reply to Pyromite)
Post #: 3
RE: CRC Check Questions - 3/24/2005 10:18:49 AM   
Flash


Posts: 276
Joined: 12/28/2001
From: UK
Status: offline
Use Dvddecryptor to read the disc in file mode and set it to skip read errors.
Reduce the number of retrys


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(in reply to seabird)
Post #: 4
RE: CRC Check Questions - 3/24/2005 12:55:51 PM   
seabird

 

Posts: 4
Joined: 3/24/2005
Status: offline
This is a couple of a mpeg file (burned on a cd-r). Not a DVD (is what DVDDEcryptor is saying). How to work it??

(in reply to Pyromite)
Post #: 5
RE: CRC Check Questions - 3/24/2005 6:35:29 PM   
xciwmff

 

Posts: 83
Joined: 1/24/2005
Status: offline
Not sure if this will work, but give CloneCD a try, make a profile and make sure you set it to ignore read errors.

(in reply to seabird)
Post #: 6
RE: CRC Check Questions - 3/24/2005 8:08:51 PM   
seabird

 

Posts: 4
Joined: 3/24/2005
Status: offline
I could not set that option, but nero 6 did it anyways. only minor flicker around bad sector and a valued memory has been recovered. Thank you all for the help

(in reply to xciwmff)
Post #: 7
RE: CRC Check Questions - 3/26/2005 2:17:50 AM   
zebra


Posts: 225
Joined: 6/20/2004
From: .:Australia:.
Status: offline
It does not look good for you, unfortunately...

I would suggest this, as nobody else has. Try using a different reader drive perhaps? Sometimes the nature of some OPU's and PUH assemblies differ enough to recover errors on an otherwise "unrecoverable" sector, as dictated by the original drive.


_____________________________

Glory may be fleeting, but obscurity is forever

My home - Speedlabs.org

The Zebra BLOG!

(in reply to seabird)
Post #: 8
RE: CRC Check Questions - 3/26/2005 3:48:02 AM   
seabird

 

Posts: 4
Joined: 3/24/2005
Status: offline
Why does it not look good?? I restored a loving memory of a friend that has passed and the only price I payed was a few very short flickers around the frame where it used to freeze and lock up... I thought my result was excellent... Nero 6 skipped the bad errors (which where aprox 2 frames each). Worked for me

(in reply to zebra)
Post #: 9
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