((my english language is not very well))

i have problem with adjusting subtitle to orginal DVD (VOB).
when i adjust the time for the first line of subtitle, the first line is start currectly with speakes , but after 30 or 40 min the subtitle line is advanced then the speakes and will advancing more then more with the time.
i have try to download many subtitle with defernt frame rate but the problem is still.
i know how to solve this problem by adjusting the first and last spoken subtitle , but it is defecult to adjusting the last line ,

the second problem is the timing of media player clasic is defernt then the powerdvd or any dvd player
for example the first line of subtitle is start at 0:00:39 with media player clasic bt the power dvd start with 00:01:00


i need solution and thXX.