Could also have something

Could also have something to do with “regional codes” as well as the PAL/NTSC and there’s even a third one out there called SECAM. The other fact of the matter is that it could simply be a bad burn or otherwise defective.

As far as determining what the DVD has been recorded in, probably you’ll need to connect with someone locally who has a means for making that determination and it is most certainly beyond my pay grade, sorry.