Iso burn problems



i came on here before about dual layer burning i was told to do it as an iso file which worked a treat thanks but i have had to put windows back on again so now when i try it i get this message all the time or in 2 cases it stoped half way the message is

optimal l1 date zone lba not found (vts 01)
the image has not been mastered correctly for burning into a duel layer
(otp track path) disc.
none of the cells meet the dvd-video specification criteria for a potential layer break position.

this is from imgburn which has worked great before carnt understand it this is from a downloaded dvd not from a disc i run it through img tool classic and i tried dvdshrink both has the same result this does it from any dvd i download ok any help


I hope it’s legal :wink: