help with adding delays

[maudit]

Hi, I'm doing a mux with Video1 and the AC3 audio taken from Video2.
Analysing those videos I've individuated 2 scene changes where some frames are missing in the Video2.
So I'd like to add a silence, a delay exactly where those few frames are missing.
How do I do that? I've tried Delaycut but crashes apart, I was not able to get a correct result. I don't know how to use it.
I also have eac3to, is it possible to add a delay in a specific point? how?
thanks

edit: ok, not sure but maybe I cutted the ac3 in 3 parts and then added a delay with eac3to in the 2 last parts.
I'm now trying to figure out, how to rejoin them togheter with eac3to.. any help?

edit2: ok better yet, I've done all in a more simple way with eacto only with the following commands:
-edit=1:37:37.280,40ms
-edit=0:52:33.920,120ms
then I added the initial delay.

I going to see if it match the video. anyway is this the correct way?

edit3: well, the ac3 cutted in delaycut, modified with eac3to and rejoined with copy /b,
has the same dimensions and also appears identical to the other one modified only with eac3to.
only their hash differ.

I think I will use the eac3to only procedure, is it easier imho. I also have some crashed with delaycut..
I suppose both the software work at the same lossless way, do they?