How is VodID defined?

[codec]

Hi,all
I'm learning information about ifo file. Now I am confused with VodID.In a DVD disc, there is one video mamager ifo and only one VTS ifo.The VOB for VTS is splitted into 9 files, which are from VTS_01_0.vob to VTS_01_8.vob. Using IfoEdit, I saw the minimum value for VodID is 1 and the maximum is 3. I don't know how VodID defined.Even though I searched the internet, I still can't
find the answer. Thanks for your help.

Best Regards
Jogging

[Sir Didymus]

Maybe the following two pictures (source Dvd Demystified by Jim Taylor) help to clarify your doubts. Please note that the physical structure, including the number of VOB files in the DVD-VIDEO disc, is used to implement the logical structure of the DVD-VIDEO format, but the two things are not the same.

For instance one constraint to obey for the physical implementation is that VOB files size shuold be less than 1GB; by using tools such as Shrink, you can easily reduce the number of VOB files in a given DVD, without changing the logical structure (VOB and Cell ID) of the compilation...

http://img393.imageshack.us/img393/4327/image1be7.th.png (http://img393.imageshack.us/my.php?image=image1be7.png)


http://img527.imageshack.us/img527/5328/image2ht1.th.png (http://img527.imageshack.us/my.php?image=image2ht1.png)

This book is pretty old, (I have the second edition of 2001), but its reading is still really recommended...

Cheers,
SD

[codec]

Thanks for your kind help.
But I still don't understand VodID. I have a copy of DVD Demystified and search VodID in the book, but get nothing. So the book even don't use VodID.

Best regards
Jogging

[blutach]

Perhaps that's because its VOB ID (with a B)

Regards

[codec]

Sorry.
It is a typing mistake. In fact, I search the book using Vob ID.

Regards
codec

[blutach]

Anyway, it's just an identifier for a segment of multiplexed video. Each segment has a VCID (Vob-Cell ID). There is usually (but not always) one VCID for each cell (and most times a cell = a chapter). You can't access a VCID except via a command to link to a particular cell.

More reading on structure here (http://www.dvd-replica.com/DVD/index.php) (read all the pages).

Regards

[Sir Didymus]

Hmmm... Searching the book?...

Let me make a personal, unrequested comment: books are made for reading, not for searching...
The second picture above is where the VOB ID are defined, on page 263 of the second edition...

You have in your hands and on your shoulders all you need to gather a deep understanding of the DVD-Video structure. Just take the time to read it (especially chapter 6)...

Cheers,
SD