How to stretch AC3 audio by .00001%

I've been searching and cannot find the answer Im looking for.

I have a movie that I'd like to add another foreign language AC3 audio file to.

The foreign language AC3 is shorter by 1 second and I need to stretch it.

The Foreign Language AC3 audio file is: 01:04:38.368

It needs to be 01:04:39.712


I have tested the number above using MKVmerge it works perfectly. BUT MKVmerge does not re-encode and I want to make a BLURAY so I need to stretch the actual AC3 file. HOW?

Is there a guide or walk-through please.

Thank You.