audi track gets asynchron in the middle of the movie

[forumman]

I got a movie where the audiotrack gets asynchron in the middle of it. There is one point where the audio gets suddenly about one second behind the movie...
What can I do?

[DSPguru]

1. demux the audio track
2. split the track to two parts. the split point should be the starting point of synch drift.
3. add delay to the second part.
4. join streams together
5. remux the audio track to the film.

[forumman]

Thanks.
which tools do i have to use?

[DSPguru]

1. virtualdub/nandub/avi2wav.
result=ac3/mp3 file.
2. BeSplit/WBIAS.
result=file01,file02
3. if the audio is an AC3 stream, you can use BeSweet v1.5b1 or AC3 Delay Corrector.
if it's mp3, you would need to "re-encode" the file02 with gain 0, and get file03. then you would need to cut file03 to any size you consider the drift.
4. BeSplit.
result=file01+file03+file02.
5. virtualdub/nandub.
result=avi.

[forumman]

which tool do i have to use to make the file3 with gain 0? And how do I find out how long it have to be exactley?

[DSPguru]

1. BeSweet.
2. http://forum.doom9.org/showthread.php?s=&threadid=36735