VOB standards for "Video Object". It is the file type to store video on a DVD disc. It is actuallly a MPEG-2 video, with special extension to support PCM, AC3, DTS audio, subpictures, and button navigation commands.
To decode DVD-VIDEO, you will need both GPL MPEG-2 Decoder, and AC-3 Decoder.
Quicktime is a multimedia development, storage, and playback technology from Apple. Quicktime files combine sound, text, animation, and video in a single file. Using a Quicktime player that either comes with a Web browser or can be downloaded from Apple or the browser company, you can view and control brief multimedia sequences.
As a multimedia stardand, QuickTime is not purely linear. It could contain interactivity and causes problems when converting to other video formats.
A lot of digital cameras record video in QuickTime support.
More information can be found on Apple's QuickTime page.
To encode QuickTime movies, you will need River Past MOV Booster Pack in addition to the video software. Don't forget to have the latest QuickTime installed.
GPL MPEG Decoder
AC-3 Decoder Filter
River Past Video Cleaner