AVI 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.

[jggimi]

...i want to make the dvd in NTSC format...i want to keep the original ac3 audio.

Those are, unfortunately, mutually exclusive goals.

Under the assumption that your 25fps .avi is progressive frames, a conversion to NTSC would require a slowing down of the video by 4% -- from 25 fps to 23.976fps. To keep the audio track in sync, it would need to be adjusted by the same percentage. Following this, a pulldown (Telecining) would be done to reach 29.97fps, but that would not change audio timing.

BeSweetGUI can adjust audio timing based on video framerates, but I do not know if .ac3 output is currently recommended.

[echooff]

Alternately, you could encode each half serperately and add both to the same title in Dvdauthor. You will never be able to tell the difference.

[jggimi]

Ah, now I see it ...

...the avi file was in 2 parts so i joined them before i bagan encoding...

Echooff is correct; each avi has a different audio delay.