To extract content from a DVD, do this:
1) Use DVD Decrypter (google for it) to copy all the DVD files to your HD
2) Use VirtualDubMod (it's on sf.net) to open the .VOB files resulting, find the bits you want. You can use Home and End keys to set start and end of a selection. You will need to apply a resize filter to compensate for DVD non-square pixels.
3) Save As using Full Processing Mode, configure the codec appropriately to be Cinepak, Indeo, MJPEG etc.