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Old 9th May 2017, 16:24   #4  |  Link
Sir Didymus
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Join Date: Mar 2004
Location: Italy
Posts: 953
A VOB ID (VID) is the unique identifier of a VOB unit, as the CELL ID (CID) is the identifier of a cell within a VOB... No?

Quoting (from Dvd Demystified, 2nd edition, 2001)...

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Each video object set (VOBS) is composed of one or more video objects (VOBs). A video object is part or all of an MPEG-2 program stream. The picture resolution and display rate are the same for all video objects in a video object set. Granularity at the VOB level is designed to group or interleave blocks for seamless branching and camera angles. Each VOB set contains one or more VOB blocks. A contiguous block contains one VOB in contiguous sectors on the disc. An interleaved block contains multiple VOBs broken into interleaved units (ILVUs) that are physically interleaved on the disc to enable seamless presentation. The size of the ILVUs is determined by the data rate of the streams, with the size kept small enough that the pickup head has time to jump over the intervening units of other video objects to get the next unit in sequence before the track buffer is depleted.
A VOB is made up of one or more cells. A cell is a group of pictures or audio blocks and is the smallest addressable chunk. A cell can be as short as a second or as long as a movie. Some authoring systems call cells scenes.
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Last edited by Sir Didymus; 9th May 2017 at 16:28.
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