RipGuard issues

[Snackki]

While backing up my collection I came across a disc (Finnish edition of SpongeBob RoundPants) that displayed no errors if converted to MKV straight from the disc, but threw several errors if the same thing was done from an .iso backup made in MakeMKV. I then made an ISO through ddrescue and that one did not display any errors either. Comparing the two dumps in a hex editor, I found entire chunks of data in the ddrescue dump that were simply missing in the MakeMKV one:

dvd.png (274.93 KiB) Viewed 2015 times

This makes me believe MakeMKV's RipGuard implementation may be slightly flawed. In addition to this, all ripguard spots are filled in with "EF" and occassionally a string saying "READ ERROR" which is honestly quite strange.
There are also a few other DVDs (such as the UK release of SpongeBob The Great Sleigh Race) where the ISO backup completely fails on MakeMKV around RipGuard spots, but works without troubles through ddrescue.

Logs from the MakeMKV RoundPants ISO:

003007:0000 Using direct disc access mode
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 7 at "_8Y~gp]N83/.*7Rw:121263199
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 8 at "_8Y~gp]N83/.*7Rw:121263199
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 9 at "_8Y~gp]N83/.*7Rw:121263199
001003:0020 DEBUG: Code 0 at u*9'>(mDm1Nfak:213137206
003003:0000 Signature is invalid in IFO file
001003:0020 DEBUG: Code 0 at u*9'>(mDm1Nfak:213137252
001003:0020 DEBUG: Code 9 at u*9'>(mDm1Nfak:29393631
001003:0020 DEBUG: Code 0 at +$_A@/HAE>Gu*s(~':121263245
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 10 at "_8Y~gp]N83/.*7Rw:121263199
001003:0020 DEBUG: Code 0 at u*9'>(mDm1Nfak:213137206
003003:0000 Signature is invalid in IFO file
001003:0020 DEBUG: Code 0 at u*9'>(mDm1Nfak:213137252
001003:0020 DEBUG: Code 10 at u*9'>(mDm1Nfak:29393631
001003:0020 DEBUG: Code 0 at +$_A@/HAE>Gu*s(~':121263245
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 11 at "_8Y~gp]N83/.*7Rw:121263199
001003:0020 DEBUG: Code 0 at u*9'>(mDm1Nfak:213137206
003003:0000 Signature is invalid in IFO file
001003:0020 DEBUG: Code 0 at u*9'>(mDm1Nfak:213137252
001003:0020 DEBUG: Code 11 at u*9'>(mDm1Nfak:29393631
001003:0020 DEBUG: Code 0 at +$_A@/HAE>Gu*s(~':121263245
Launching C:\Program Files (x86)\MakeMKV\mmgplsrv64.exe
001003:0020 DEBUG: Code 118095996 at t@0qOpXwqs/,9~q]A&p&nou:29394183
001003:0020 DEBUG: Code 0 at t@0qOpXwqs/,9~q]A&p&nou:121263590
001003:0020 DEBUG: Code 1 at n[Zy%v?9:72#^FwvnV]o:29394689
001003:0020 DEBUG: Code 3221225649 at 6Zll4j:o?e20(+mh?z$:wLD:29394919
001003:0020 DEBUG: Code 3221225649 at t@0qOpXwqs/,9~q]A&p&nou:213130145
001003:0020 DEBUG: Code 3221225480 at 6Zll4j:o?e20(+mh?z$:wLD:121262509
001003:0020 DEBUG: Code 3221225480 at t@0qOpXwqs/,9~q]A&p&nou:29394183
001003:0020 DEBUG: Code 0 at t@0qOpXwqs/,9~q]A&p&nou:121263590
001003:0020 DEBUG: Code 0 at 3alQd2hOf!%UQ+:29397104
003038:0000 Cells 9-12 were removed from title end
003028:0000 Title #1 was added (8 cell(s), 1:17:17)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #2 was added (4 cell(s), 0:12:37)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #3 was added (4 cell(s), 0:12:32)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #4 was added (4 cell(s), 0:12:24)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #5 was added (4 cell(s), 0:12:31)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #6 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #7 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #8 was added (4 cell(s), 0:12:39)
003038:0000 Cells 3-5 were removed from title end
003028:0000 Title #9 was added (2 cell(s), 0:11:38)
003038:0000 Cells 9-12 were removed from title end
003028:0000 Title #10 was added (8 cell(s), 1:17:17)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #11 was added (4 cell(s), 0:12:37)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #12 was added (4 cell(s), 0:12:32)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #13 was added (4 cell(s), 0:12:24)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #14 was added (4 cell(s), 0:12:31)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #15 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #16 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #17 was added (4 cell(s), 0:12:39)
003038:0000 Cells 3-5 were removed from title end
003028:0000 Title #18 was added (2 cell(s), 0:11:38)
003038:0000 Cells 9-12 were removed from title end
003028:0000 Title #19 was added (8 cell(s), 1:17:17)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #20 was added (4 cell(s), 0:12:37)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #21 was added (4 cell(s), 0:12:32)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #22 was added (4 cell(s), 0:12:24)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #23 was added (4 cell(s), 0:12:31)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #24 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #25 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #26 was added (4 cell(s), 0:12:39)
003038:0000 Cells 3-5 were removed from title end
003028:0000 Title #27 was added (2 cell(s), 0:11:38)
003038:0000 Cells 9-12 were removed from title end
003028:0000 Title #28 was added (8 cell(s), 1:17:17)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #29 was added (4 cell(s), 0:12:37)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #30 was added (4 cell(s), 0:12:32)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #31 was added (4 cell(s), 0:12:24)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #32 was added (4 cell(s), 0:12:31)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #33 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #34 was added (4 cell(s), 0:12:38)
003038:0000 Cells 5-5 were removed from title end
003028:0000 Title #35 was added (4 cell(s), 0:12:39)
003038:0000 Cells 3-5 were removed from title end
003028:0000 Title #36 was added (2 cell(s), 0:11:38)
003038:0000 Cells 2-2 were removed from title end
003028:0000 Title #37 was added (1 cell(s), 0:04:50)
003038:0000 Cells 2-2 were removed from title end
003028:0000 Title #38 was added (1 cell(s), 0:06:35)
003038:0000 Cells 2-2 were removed from title end
003028:0000 Title #39 was added (1 cell(s), 0:00:15)
003038:0000 Cells 2-2 were removed from title end
003028:0000 Title #40 was added (1 cell(s), 0:03:37)
003038:0000 Cells 2-2 were removed from title end
003028:0000 Title #41 was added (1 cell(s), 0:14:11)
003028:0000 Title #42 was added (1 cell(s), 0:00:04)
Title skip vts=8 pgcn=1
003014:0000 Title #44 in broken titleset was skipped
003014:0000 Title #45 in broken titleset was skipped
003014:0000 Title #46 in broken titleset was skipped
003027:0000 Title #10 in VTS 1 is equal to title #01 and was skipped
003027:0000 Title #19 in VTS 1 is equal to title #01 and was skipped
003027:0000 Title #28 in VTS 1 is equal to title #01 and was skipped
003027:0000 Title #18 in VTS 1 is equal to title #09 and was skipped
003027:0000 Title #27 in VTS 1 is equal to title #09 and was skipped
003027:0000 Title #36 in VTS 1 is equal to title #09 and was skipped
003034:0000 Audio stream #0 in title #42 looks empty and was skipped
003034:0000 Audio stream #1 in title #42 looks empty and was skipped
003034:0000 Audio stream #2 in title #42 looks empty and was skipped
003034:0000 Audio stream #3 in title #42 looks empty and was skipped
005011:0000 Operation successfully completed

Logs from the ddrescue RoundPants ISO:
003007:0000 Using direct disc access mode
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 7 at "_8Y~gp]N83/.*7Rw:121263199
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 8 at "_8Y~gp]N83/.*7Rw:121263199
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 9 at "_8Y~gp]N83/.*7Rw:121263199
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 10 at "_8Y~gp]N83/.*7Rw:121263199
DEBUG: Code 0 at `.5&w{UQ9+(B={!RmP?:121261704
DEBUG: Code 11 at "_8Y~gp]N83/.*7Rw:121263199
Launching C:\Program Files (x86)\MakeMKV\mmgplsrv64.exe
003028:0000 Title #1 was added (12 cell(s), 1:29:05)
003028:0000 Title #2 was added (5 cell(s), 0:12:37)
003028:0000 Title #3 was added (5 cell(s), 0:12:32)
003028:0000 Title #4 was added (5 cell(s), 0:12:24)
003028:0000 Title #5 was added (5 cell(s), 0:12:31)
003028:0000 Title #6 was added (5 cell(s), 0:12:38)
003028:0000 Title #7 was added (5 cell(s), 0:12:38)
003028:0000 Title #8 was added (5 cell(s), 0:12:39)
003028:0000 Title #9 was added (5 cell(s), 0:12:32)
003028:0000 Title #10 was added (12 cell(s), 1:29:05)
003028:0000 Title #11 was added (5 cell(s), 0:12:37)
003028:0000 Title #12 was added (5 cell(s), 0:12:32)
003028:0000 Title #13 was added (5 cell(s), 0:12:24)
003028:0000 Title #14 was added (5 cell(s), 0:12:31)
003028:0000 Title #15 was added (5 cell(s), 0:12:38)
003028:0000 Title #16 was added (5 cell(s), 0:12:38)
003028:0000 Title #17 was added (5 cell(s), 0:12:39)
003028:0000 Title #18 was added (5 cell(s), 0:12:32)
003028:0000 Title #19 was added (12 cell(s), 1:29:05)
003028:0000 Title #20 was added (5 cell(s), 0:12:37)
003028:0000 Title #21 was added (5 cell(s), 0:12:32)
003028:0000 Title #22 was added (5 cell(s), 0:12:24)
003028:0000 Title #23 was added (5 cell(s), 0:12:31)
003028:0000 Title #24 was added (5 cell(s), 0:12:38)
003028:0000 Title #25 was added (5 cell(s), 0:12:38)
003028:0000 Title #26 was added (5 cell(s), 0:12:39)
003028:0000 Title #27 was added (5 cell(s), 0:12:32)
003028:0000 Title #28 was added (12 cell(s), 1:29:05)
003028:0000 Title #29 was added (5 cell(s), 0:12:37)
003028:0000 Title #30 was added (5 cell(s), 0:12:32)
003028:0000 Title #31 was added (5 cell(s), 0:12:24)
003028:0000 Title #32 was added (5 cell(s), 0:12:31)
003028:0000 Title #33 was added (5 cell(s), 0:12:38)
003028:0000 Title #34 was added (5 cell(s), 0:12:38)
003028:0000 Title #35 was added (5 cell(s), 0:12:39)
003028:0000 Title #36 was added (5 cell(s), 0:12:32)
003028:0000 Title #37 was added (2 cell(s), 0:04:50)
003028:0000 Title #38 was added (2 cell(s), 0:06:35)
003028:0000 Title #39 was added (2 cell(s), 0:00:15)
003028:0000 Title #40 was added (2 cell(s), 0:03:37)
003028:0000 Title #41 was added (2 cell(s), 0:14:11)
005011:0000 Operation successfully completed

[bufulo]

I believe I'm also seeing a problem related to RipGuard. In my case, RipGuard seems to be preventing MakeMKV from making a Backup from DVD. It gets very near the end (within a few hundred kB of the total claimed, which is about double what it should be) after MANY RipGuard notices before failing. I get the exact same results using a LibreDrive and on a totally different computer using a non LibreDrive.

The interesting part is that I can rip all the titles from the DVD but I get a LOT of messages during Opening. Here is the last of them (they are almost all the same as these, just SO MANY more of the first line below):

The source file '/VIDEO_TS/VTS_04_1.VOB' is corrupt or invalid at offset 194560-208896, attempting to work around
Too many AV synchronization issues in file '/VIDEO_TS/VTS_04_1.VOB' (title #-) , future messages will be printed only to log file
The source file '/VIDEO_TS/VTS_04_1.VOB' is corrupt or invalid at offset 12288, attempting to work around
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
DEBUG: Code 0 at `@EwUL>S'%f.9\7(hz::213132376
Operation successfully completed


When trying to Backup this DVD, it FAILS, with these messages:

Backing up disc into folder "F:/Mr Woodcock (2007)/Mr Woodcock (2007).iso"
Calculated BUP offset for VTS #1 does not match one in IFO header.
DEBUG: Code 1 at u*9'>(mDm1Nfak:29400071
IFO file for VTS #1 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
Calculated BUP offset for VTS #2 does not match one in IFO header.
Calculated BUP offset for VTS #3 does not match one in IFO header.
Calculated BUP offset for VTS #4 does not match one in IFO header.
DEBUG: Code 4 at u*9'>(mDm1Nfak:29400071
IFO file for VTS #4 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
Calculated BUP offset for VTS #5 does not match one in IFO header.
DEBUG: Code 5 at u*9'>(mDm1Nfak:29400071
IFO file for VTS #5 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
Calculated BUP offset for VTS #6 does not match one in IFO header.
DEBUG: Code 6 at u*9'>(mDm1Nfak:29400071
IFO file for VTS #6 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
Calculated BUP offset for VTS #7 does not match one in IFO header.
DEBUG: Code 7 at u*9'>(mDm1Nfak:29400071
IFO file for VTS #7 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
Calculated BUP offset for VTS #9 does not match one in IFO header.
DEBUG: Code 9 at u*9'>(mDm1Nfak:29400071
IFO file for VTS #9 is corrupt, VOB file must be scanned. This may take very long time, please be patient.
DEBUG: Code 17 at "_8Y~gp]N83/.*7Rw:213131318
DBG ASSERT: ,D$X},3rf3%lW*cX*oYLZ[R zpTbU*N{8u+ at u*9'>(mDm1Nfak:29402003
Calculated BUP offset for VTS #17 does not match one in IFO header.
DEBUG: Code 0 at B`ut4y]!X\p5gw'4V:jX:121266097
Backup failed

What would cause this behavior? Is there any workaround to get a Backup (ISO) in this case?