audio out of sync when encoding MKV file with frozen frames

I have an MKV video clip that has a bunch of frozen frames. If I play it in a VLC player it plays correctly, however I need to convert this file to a DVD and the problem is that AVISynth just skips over these frozen frames without adjusting audio accordingly and the result is out of sync. Is there a way to solve this problem ?

This is the AVISynth script I use:

DirectShowSource("j:\clip.mkv")
Crop(0, 1, 0, -1)
Crop(92, 0, 536, 402)
LanczosResize(720,480)