[MEncoder-users] variable framerate mp4 input, audio/sync problem

[Mger Zero]

I'm trying to encode mp4 video with variable framerate into dvd-format mpeg video.  However, there is audio/sync issue with the output.

Here is a short-version of the command that i'm using:
mencoder input.mp4 -mc 0 -af resample=48000:0:2:channels=2 -oac lavc -vf harddup -ovc lavc -lavcopts acodec=ac3:abitrate=192:vcodec=mpeg2video -of mpeg -mpegopts format=dvd:tsaf -ofps 30000/1001 -o output.mpg

-mc 0 -vf harddup, they are the options to help keep audio/video sync, but so far it's not working for variable-framerate mp4.

Does anyone knows other ways to deal with variable-framerate videos?

Thanks.