XVID To DVD Out Of Sync

[hddvd]

i have an xvid movie. when i convert it to dvd it shows good for about half of the movie but then the audio and video gets out of sync. in GSpot the FPS is 25.000 and the movie has AC3 audio. i am using TMPGEnc to encode the video. is there any settings that i should change? i want to keep the original ac3 audio. i want to make the dvd in NTSC format. also i did demux the audio from the original xvid file and authored it back with the encoded video with tmpgenc dvd author. the movie gets out of sync all of a sudden near the middle of the movie, this only happens with the encoded dvd, the original AVI file is in perfect sync. the avi file was in 2 parts so i joined them before i bagan encoding. any help would be great.

[tebasuna51]

Try this:

Extract the part1.ac3 and the part2.ac3 and fix them with:
besplit -core( -input part1.ac3 -prefix par1 -type ac3 -fix )
besplit -core( -input part2.ac3 -prefix par2 -type ac3 -fix )

Join the two ac3 with:
copy /B par1.ac3 + par2.ac3 all.ac3

With VirtualDubMod join only the video and after add the all.ac3

The problem is:
First part1.ac3 can finish with an incomplete block, and second part2.ac3 can start in the middle of a block without a correct header.

[hddvd]

what tool do i use?

[tebasuna51]

VirtualDubMod to extract the two ac3 parts, join the two video parts and after add the all.ac3

BeSplit (http://dspguru.doom9.org/) to fix the two ac3 parts and also to join with:
besplit -core( -input list.lst -prefix all.ac3 -type ac3 -join )

Where list.lst is a text file (Notepad) with the names of the files to join.
(same result with: copy /B par1.ac3 + par2.ac3 all.ac3)