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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AVI stands for Audio Video Interleave. Files of this format have an .avi extension. Developed by Microsoft in 1992, it has become so widespread that many people consider it the de-facto standard for storing video and audio information on PC. AVI combines audio and video into a single file in a standard container to allow simultaneous playback. Its advatage is a simple architecture, due to which AVI runs on a number of different systems like Windows, Mac, Linux, Unix and is supported by all of the most popular web-browsers.'
AVI is a derivative of the Resource Interchange File Format (RIFF), which divides a file's data into blocks, or chunks. Each chunk is identified by a FourCC tag. An AVI file takes the form of a single chunk in a RIFF formatted file, which is then subdivided into two mandatory chunks and one optional chunk. The first sub-chunk is identified by the hdrl tag. This sub-chunk is the file header and contains metadata about the video, such as its width, height and frame rate. The second sub-chunk is identified by the movi tag. This chunk contains the actual audio/visual data that make up the AVI movie. The third optional sub-chunk is identified by the idx1 tag which indexes the offsets of the data chunks within the file.
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