Differences between version 21 and predecessor to the previous major change of DVDVideoTerminology.
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| Newer page: | version 21 | Last edited on Saturday, January 9, 2010 9:29:50 pm | by LawrenceDoliveiro | Revert |
| Older page: | version 20 | Last edited on Saturday, January 9, 2010 2:40:22 pm | by LawrenceDoliveiro | Revert |
@@ -1,7 +1,7 @@
Some of the more esoteric terms and concepts you may come across in [DVDVideo].
-DVD-Video requires files in [MPEG-2 program stream|MPEGTerminology] format, with a pack size of 2048 bytes, the same size as a sector on the disc. Packs are in turn grouped together into a "VOBU" (Video Object Unit): this always begins with a pack for the navigation stream, followed by packs for the other streams (video, audio, subpicture). Thus, the multiplexing happens between packs in a VOBU, and the VOBU is the smallest unit that a player/decoder can work with at once.
+DVD-Video requires files in [MPEG-2 program stream|MPEGTerminology] format, with a pack size of 2048 bytes, the same size as a sector on the disc. Packs are in turn grouped together into a "VOBU" (Video Object Unit): this always begins with a pack for the navigation stream, followed by packs for the other streams (video, audio, subpicture). Thus, the multiplexing happens between packs in a VOBU, and the VOBU is the smallest unit that a player/decoder can work with at once. A VOBU should contain at least one complete GroupOfPictures
.
One or more consecutive VOBUs make up a ''cell''. This is the basic unit of playback in DVD-Video. A cell can have associated program instructions in the virtual machine language, for example telling the player to keep looping the same cell, or jump to another cell.
The cell structure is used, among other things, to define ''parts of titles'' (PTTs), which ordinary users know as "chapters". Why they couldn't just call them chapters in the spec, I don't know...
