sync problem

[RH+]

I have a huffyuv 30fps avi file, i convert it to MPEG2 using CCE, I extract the audio with VirtualDubMod and convert it to MP2 using besweet, when I test the encoded audio and the video they are out of sync, I think that it can be a fps problem because im encoding at 29.97fps and i see that the audio is more out of sync in the end that in the middle of the video.
I try to use besweet to convert from 30000 to 29970 and it doesnt start it just show the input/output information but doesnt do anything.
Any ideas of how can i fix this?
thanks and sorry for my english

[AlanHK]

get mp2scale from http://thunder.eeap.cwru.edu/~zhuo/audioscale.html

mp2scale [-t targetsec] [-o outfile] infile
mp2scale: Scale mp2 audio to given number of seconds with duplicated or dropped frames.
Outputs estimates for infile if -o option is not given
-t targetsec Scale audio to targetsec number of seconds.
-o outfile Outputs complete frames from infile to outfile scaled to targetsec if specified.

First run mp2scale on your file like :
mp2scale infile.mp2

It reports the exact length in seconds.

Work out how much you need to stretch, or cut, from the MP2,
then add or subtract that from the original length as above and run it like

mp2scale -t length -o newfile.mp2 infile.mp2

[RH+]

I can only get the h:mms of the MPEG2 (mpv) video, what can i use to see the total length of the video?
thanks again