compressing menu

I have motion menu, and I want to compress it using hc encoder. First I extracted cells with vobedit, and now I have a bunch of vobs (VTS_03_001 ..) . Now I want to get from each vob m2v file and ac3 (using avisynth script), create another avisynth script and put it in hc to compress m2v files and in the end put together newly created m2v and ac3 and then replace original cells with those vobs with menuedit. How can I get m2v and ac3 from each vob automaticly with avisynth script ? Is perhaps any other more easy way to compress all this?

DGIndex also has features to demux the audio and video as well if you really need to do so.

This might work, especially if you want a significant space saving: "MenuShrink turns motion menus into still menus with or without audio, cutting down their size 60% to 95%, often saving several hundreds of megabytes. A great complement to DVD Shrink."