Re: jump from VMGM to titleset

On Wed, 3 Nov 2010 20:42:23 +0100 José Jorge <[email protected]> wrote:

> This action is refused by dvdauthor 0.7.0 from the vmgm :
> 
> jump titleset 1 title 1;
> 
>  ERR:  That form of jumping is not allowed
>  ERR:  in VMGM pgc 1, button 1
> 
> 
> While this one works :
> 
> jump title 1;

OK, there’s a tricky issue going on here. For jumping from the VMGM
into a VTS title, the instruction is JumpTT. However, if you look at
the encoding for that <http://mpucoder.com/DVD/vmi.html>, it only takes
a title number, but no titleset number.

What happens when the disc is authored, is a TT_SRPT table gets
constructed <http://mpucoder.com/DVD/ifo_vmg.html> which maps a global
sequence of title numbers to title numbers within the individual
titlesets. I think it is these global title numbers that the JumpTT
instruction is expecting.

However, dvdauthor hasn’t worked out these numbers yet. That’s why it
has to generate the jumppad logic, so that you can say “jump titleset x
title y”, and the jumppad code in the VMG will jump to further jumppad
code in titleset x, which will in turn jump to title y.

The relevant numbers are easy to work out, providing you’re authoring
the whole disc at once, so you already know how many titles there are
in each titleset. It won’t be fixable if you author the disc
incrementally.

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