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Yes, r0lZ! How to say, it is complex, surely redundant (agreed!), but the DVD-VIDEO is specified this way.
The VOB data type for the DVD format is the key multiplexed format supporting the synchronised presentation of a video channel + 8 audio + 32 subpicture streams simultaneously, including nice multimedia features such as multiple video angles and seamless branching.
Video Object Sets are a collection of Video Objects, VOBs are divided into cells and cells are composed of VOB Units, that are a sequence of packs. This is the hierarchy.
Cells are more or less consisting of individual scenes of a movie.
If we want to support in a single video channel the presence of multiple angles of the same scene, it is (quite?) logical that the cell ID of a given scene is left unchanged among the different angles, using the VOBs and the VID, in the upper level of the data format to support this feature.
@ LigH: as reported by others in the original thread in the VideoHelp forum (manono has been pointing this out), very rarely there is a good technical reason - IMHO to demux a DVD into individual VOBS, apart the curiosity and the (always valid) willingness to learn about the format. Using the IFO structure (it is there for a reason, no?), and demuxing by PGC is the way to go...
Last edited by Sir Didymus; 10th May 2017 at 22:57.
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