A while back my dad transferred a lot of our old VHS tapes to DVD by linking his DVD recorder to the video. Unfortunately he didn't bother to check them before he got rid of the tapes! I've just discovered some of them aren't playing

My first thought was that he hadn't finalised them so I checked but they have. Some are not playing at all - and some on the PC only. I'm not exactly sure what he's done and he can't tell me!
Anyway, the one that matters the most to me is a disc full of film of all my beloved and now departed pets. It plays on the PC but not on the DVD player. When I look at the files it looks like normal VIDEO_TS files but all the DVD players are just spitting it back out!
Can anyone help??? The stuff on this disc is precious to me!!