I recommend you a useful and free tool that can convert video, rip dvd, Backup DVD and download YouTube video.
it called "Next Video Converter". It is easy to use, you only need click few button.
Next Video Converter is a free video converter and DVD ripper with easy-to-use graphical interface, fast converting speed, and excellent video quality. It can convert almost all video formats including DivX, XviD, MOV, RM, RMVB, MPEG, VOB, DVD, WMV, and AVI to MPEG-4 movie format for iPod, iPhone, PSP or other portable video device, MP4 player, or Smartphones. It can also rip DVD to any video format.