Posix & Scsi errors lead to failure - is this "structure protection"?

[seamus]

While attempting to process a DVD w/ MakeMKV on my macOS Sequoia, the failure was preceded by a number of entries in the "console area" of the screen:

Saving 1 titles into directory /Users/seamus/Movies/V FOR VENDETTA

Immediately followed by this error which repeats 5 times:

Error 'Posix error - Input/output error' occurred while reading '/dev/rdisk6' at offset '65536'
DEBUG: Code 1073741829 at (j29=?}LKk\Ph$Ofy5:213131502

Followed by this error which repeats 6 times:

Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '65536'
DEBUG: Code 100864261 at (j29=?}LKk\Ph$Ofy5:213131502

Followed by this series of "DEBUG Codes":

DEBUG: Code 0 at K~SDT"O1XSWm1RFIiq{g:29395793
DEBUG: Code 0 at D9(>WTwogO{i39RKg%0:29393562
DEBUG: Code 0 at K~SDT"O1XSWm1RFIiq{g:213131157
DEBUG: Code 0 at K~SDT"O1XSWm1RFIiq{g:121262647
DEBUG: Code 32 at K~SDT"O1XSWm1RFIiq{g:121261773
DEBUG: Code 0 at QLEG"BH6@5LdmBQA:k34_:121268972
DEBUG: Code 0 at K~SDT"O1XSWm1RFIiq{g:213135504
DEBUG: Code 1 at S<I.qBg;$di!`Yi)}\1:29395816
DEBUG: Code 0 at S<I.qBg;$di!`Yi)}\1:213134906
DEBUG: Code 0 at fnKw7c!9v3[Q JjG:213130904
DEBUG: Code 0 at QLEG"BH6@5LdmBQA:k34_:213136907
DEBUG: Code 0 at fnKw7c!9v3[Q JjG:213130582
DEBUG: Code 0 at yJ2|-K/Z@;_0xPO,3p:121269731
DEBUG: Code 0 at yJ2|-K/Z@;_0xPO,3p:29401819
Failed to save title 0 to file /Users/seamus/Movies/V FOR VENDETTA/V FOR VENDETTA_t00.mkv
Encountered 5 errors of type 'Read Error' - see http://www.makemkv.com/errors/dvdread/
0 titles saved, 1 failed

I've read the referenced web page: https://www.makemkv.com/manualdvd/
But I'm afraid those instructions do not "click" for me at this point. Is there no other way to work around this so-called "structure protection"??

FWIW:
1. I see the same error sequence detailed above on two BD readers: a Pioneer, and an Asus.
2. This DVD plays just fine in the player connected to my TV. It's been lightly used w/ no obvious scratches/flaws/goop on the disk surface, etc. I've cleaned this disk twice very thoroughly with the water/alcohol mix recommended, but get the exact same result after each cleaning that I got when tried initially.
3. Thus, the "structure protection" seems likely (to me).

Thanks,
~S

[dcoke22]

Errors like this

Code: Select all

Error 'Scsi error - MEDIUM ERROR:L-EC UNCORRECTABLE ERROR' occurred while reading '/VIDEO_TS/VTS_01_1.VOB' at offset '65536'

usually mean the optical drive was unable to correctly read a spot on the disc.

DVD players generally try to ignore read errors and hope the visual/audio glitch it causes is too small to notice.