audio delay problem

[Raging_Inferno]

I am creating a dvd rip that has a intro that has no audio, and 13 seconds later the actual movie starts with the ac3 audio
problem is that the delay give after riped with dvd2avi, is the delay after the intro is over and when the movie actually starts
How do i figure out the actual delay needed?

i tried finding actual length of the movie and then finding the lengh of the audio without adding the delay and taking the 2 times and subtracking them and then getting a ussable delay
that did work (i think) but only at 29.97 frames
i gave the movie (an anime) an IVTC and check the final time and the new 23.97 frame movie time doesn't match with the 29.97 version (the 23.97 was short a few hundrend milliseconds)
if i keep it 29.97 frames it looks kinda funny with those extra frames
so how can find the delay and keep the audio to match the 23.97 version of the divx?
Thanks for helping! :)

[Awatef]

try and fail ;)

begin in 1000s of ms steps, kinda 13000, if it's too late, go back to 12000, if it's too early, go to 12500, and so on, until you find the right value.

You don't have to mux the whole episode every time again, just take the first minute for example.