A VOB file is normally known as a DVD Video Object file, and is one of the most common formats for storing video and audio streams on DVD discs. The VOB format also may denote a Vue d'Esprit object, which is a 3D model created for use within the application. A VOB file contains video streaming in MPEG-2 format and audio streaming in one of several formats.
VOB files are a container, which consist of 3 things. They consist of video, audio and subtitle streams. The video stream is in MPEG-2 format, the audio however can be in various forms such AC3 - which is the most common, MPEG-2 multichannel, MPEG-1 Layer 2 dual channel or PCM format. The reason AC3 is the most common is that it offers a good compromise between quality and bitrate.
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The GIF file format is a type of bitmap image and has become popular due to the growth of the internet. This file format supports up to 8 bits per pixel therefore giving an image the ability to contain 256 distinct colours chosen from the 24-bit RGB colour space. It also supports animations and whenever you see a logo or other sharp edged line art then you are probably dealing with the GIF format. It uses the lossless data compression technique which reduces the file size without any impact on the quality.
The GIF file format was invented by Compuserve for their online service, but they made the specifications publicly available. GIFs are able to hold multiple bitmaps of up to 256 colors each, using LZW (Lempel Zev Welch - a simple form of file compression that removes inefficiencies in the data storage without losing data or distorting the image) compressed raster data to minimize file sizes. The idea is to lessen the amount of colours in a GIF image to the minimum number necessary and to therefore remove stray colors that are not required to represent the image. A GIF graphic is unable to have more than 256 colors but it can have fewer colors, down to the minimum of two (black and white). Images with fewer colors will compress more efficiently under LZW compression.
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