I've found a problem with dumping some DVD-Video discs using DIC. Well, really, 2 problems.
First, starting with DIC 20200203, all of the Cube DVDs fail to dump, with the error being "nLBA 262, Directory Record is invalid". DIC 20200204 is also affected, while 20191116, 20191223, and 20200120 are not. This immediately stops dumping right at the start, with a 0-byte image file.
Secondly, DIC 20191223 and 20200120 produce an error with Cube DVD 01. Unfortunately, my disc is rather scratched and it was hard to get a full dump, so I can't do too much testing and most dump attempts are polluted with other errors later on, but I did get a clean dump with 20200120 (which is the one I submitted there). The specific error appears at the start and is this:
LBA[702695, 0xab8e7]: [F:ReadDVDForFileSystem][L:855]
ScsiStatus: 0x02 = CHECK_CONDITION
SenseData Key-Asc-Ascq: 03-11-05 = MEDIUM_ERROR - L-EC UNCORRECTABLE ERROR
Dumping continues after the error, and (in that one lucky dump) I didn't get any other errors, including when it read that same area for actually writing. (That area is all zeros, though).
These are all 8 cm DVDs, so perhaps that has something to do with it? Unfortunately I don't have any regular full-size DVDs to compare with.
The first is probably a bigger issue since it completely prevents dumping these discs with current versions of DIC, but I am curious why the second one happens too.