The ripping problem when compressing DVD
 

The ripping problem when compressing DVD
I bought a DVD the day before yesterday, feeling it so classic. However, I would like to compress the DVD and convert it into *.rmvb files for sharing with friends on the Internet. Then the problems come up.
For ripping DVD, I use DVD Decrypter to help complete the conversion task.
Mode->settings, file mode->none
After finishing these steps, there are still multiple *.vob files.
The second DVD
Open one of *.vob files and let it directly play on the player. The audio and video are out of sync. While playing DVD on the player, they keep sync.
Could any expert about it help me?