DVD Structure info

[yahio]

Dear Sir or Madam,
I'd like to write a utility that makes DVD updating easier.My idea is that the app just updates the vobs and the ifo and then you're set.This way a user can add subtitles/audio tracks/video tracks to the existing DVD with minimal effort.Moreover the user keeps the chapters and the menue.
In order to realize this project please provide me with the folowwing information:
-how is the vob structure defined
-in which format are video,audio and subtitles
and how can I write to a vob file
-how can I update all vobs
Thank you,
yahio@gmx.net

[CoNS]

New tools are always welcome, but there are already a number of freeware tools that does the job you describe.

IMO, the best way is to use VobBlanker's Replace PGC function to copy the new material into the original DVD structure. There's a guide on how to use the Replace function here (http://www.videohelp.com/~jsoto/guides/VobBlanker/adding_menus/) (step 6-8 in the guide).

There are some alternative methods to VobBlanker's Replace PGC function:

1. Load the DVD in PgcEdit and use the "Replace VTS" function to copy the new material into the DVD.

Or:

2. Use Windows Explorer to replace the original VTS with a new one (renumber the new main movie VTS in the filenames, if needed, to match the old one). Then use IfoUpdate or BatchUpdateIFO to update the IFOs of the original DVD with the correct information about the new material.

Normally the last mentioned two methods only work, if the VTS you are replacing only contains one PGC. However, VobBlanker's Replace function works on PGC level, and thus it usually is the safe choice as it should work no matter how the VTS is structured...

Anyway, all of the tools mentioned above are supported in other sections of this forum, and so it may be better for you to post there, for example in the IFO & VOB Editors section, where VobBlanker, PgcEdit and the nice IFO/VOB update tool, FixVTS, by jeanl is supported, too.