I haven't done this for absolutely years because I no longer use VHS or DVD, but sync problems were quite common.
How much out of sync?
Does it get progressively worse as the DVD plays?
What sample rate did you use on the original audio rip?
What resolution and frame rate is the original video rip?
What frame rate and audio format is the resultant DVD?
What are you using to encode the DVD?
DVDs usually use an audio sample rate of 48K, while the 44.1K CD rate is more normal on a PC. Converting between the two can sometimes cause creep. It shouldn't, but it depends on the software you use.
With AVIs in particular, the frame rate is inaccurately specified in the file header. Some software corrects for this better than others. Errors cause creep, so short clips are OK but long films are several seconds out by the end.
The default for a lot of DVD software is American. If you're converting from 25fps to 29.98fps then that is another opportunity for timing errors.
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