There is another tool for converting to .avi created by another member (lokster) called
viDrop.
Have a look here for -->
more information about viDrop - Free Open-Source converter for RockChip MPEG4 (XVID) players.
However, looking at what you want to archieve, I wonder if it's easier to get a AVI Converter software that joins all VOB files firstly before using the AVIConverter tool to convert it to the correct format to view on the player....? I haven't converted DVD to AVI for a long long time now so alittle out of touch with what software to use that will do it. I'm sure other members can help out here too.