I have, in the past used older versions of MakeMKV reliably for DVDs. However I just got a new batch and so far 5/6 have failed to rip. The discs are undamaged; I do a backup to .iso in makemkv with no errors. MPV plays both the discs and the .iso dumps just fine. For the two discs with special features, it's only the main feature that fails.
Here's the log from one of the DVDs:
Using direct disc access mode
Calculated BUP offset for VTS #1 does not match one in IFO header.
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.
Calculated BUP offset for VTS #5 does not match one in IFO header.
Calculated BUP offset for VTS #6 does not match one in IFO header.
Calculated BUP offset for VTS #7 does not match one in IFO header.
Calculated BUP offset for VTS #8 does not match one in IFO header.
Calculated BUP offset for VTS #9 does not match one in IFO header.
Calculated BUP offset for VTS #10 does not match one in IFO header.
Calculated BUP offset for VTS #11 does not match one in IFO header.
Calculated BUP offset for VTS #12 does not match one in IFO header.
Calculated BUP offset for VTS #13 does not match one in IFO header.
Title #1 was added (12 cell(s), 1:27:10)
Title #4 has length of 115 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #7 has length of 107 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #8 has length of 99 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Can't locate a cell for VTS 7 TTN 1 PGCN 4 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 5 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 6 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 7 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 8 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 9 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 10 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 12 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 13 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 14 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 15 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 16 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 17 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 18 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 19 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 20 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 21 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 22 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 23 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 24 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 25 PGN 1
Can't locate a cell for VTS 7 TTN 1 PGCN 27 PGN 1
Title #9/1 has length of 8 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #9/2 has length of 7 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Can't locate a cell for VTS 8 TTN 1 PGCN 2 PGN 1
Can't locate a cell for VTS 8 TTN 1 PGCN 3 PGN 1
Can't locate a cell for VTS 8 TTN 1 PGCN 4 PGN 1
Can't locate a cell for VTS 8 TTN 1 PGCN 5 PGN 1
Can't locate a cell for VTS 8 TTN 1 PGCN 6 PGN 1
Can't locate a cell for VTS 8 TTN 1 PGCN 7 PGN 1
Can't locate a cell for VTS 8 TTN 1 PGCN 8 PGN 1
Can't locate a cell for VTS 8 TTN 1 PGCN 9 PGN 1
Operation successfully completed
Saving 1 titles into directory REDACTED
DEBUG: Code 0 at z-("}9#Hk~G8Q-Bd;:213130237
DEBUG: Code 3 at JyQ[sci0<Om&Zhn6:121264418
DEBUG: Code 0 at jp5C3/9 )kz!Xo%fEEJ0:121261773
DEBUG: Code 0 at z{J3N9@Fcwb^]g$v@)*@*:121268972
LIBMKV_TRACE: Exception: Error while reading input
Failed to save title 0 to file REDACTED
0 titles saved, 1 failed