3 pre commands?

[agzz]

I have more problems :)

When i backup DVDs i usually set Pre Command to go to main menu directly, skipping splashes and FBI warnings.
there are usually only one pre command, but here i have 3. and the first two i have no idea of what they are/do.
What if i set them as usual (to look like the third one), will every thing work ok on players, it does on my comp, but that anouther thing..
do the disc expect the values someware?

If i dont change it i get a 12 sec splash screen. If i change them i dont. and thats how i like it, but will it work?

this is how it looks:

PGC Command Table:

[000000ec] Number of Pre Commands 3
[000000ee] Number of Post Commands 0
[000000f0] Number of Cell Commands 0
[000000f2] Size of Command table in bytes 31

[000000f4] 1.Pre Command Set GPreg<6> mov (set-val)<1000>
[000000fc] 2.Pre Command Set GPreg<7> mov (set-val)<1>
[00000104] 3.Pre Command (JumpSS VTSM) Jump to TitleSet(vts): 1, Title(ttn): 1, root-menu

thanks
/agzz

[mpucoder]

No one will be able to tell you what those do. Only by disassembling the entire DVD will you know why those values are set into those registers.

I can't stress this enough, a DVD is a computer program.
It may appear to be a simple computer, but it is running the program on the DVD. You must approach command editing as you would hacking any computer program.

[agzz]

Thanks. So its trail and error time for me then :)

[mpucoder]

Somewhat. You could use IfoEdit to follow the code, as you would in a disassembler/debugger. Find out where the jump goes, and look in the associated PGC to see if the registers (GPRM 6 and 7) are used or tested, etc.

[roach76]

Just remember that GPreg<6> = 1000 and GPreg<7> = 1. Then open your VTS_01_1.IFO and go to the 'RootMenu' PGC and see what those 'Pre/Post Commands' do. Because of those registers being 1000 and 1, these might cause it to jump out of the 'Root Menu' PGC into another one and another one until finally plays that Splash Screen.

Find out which PGC Menu has the VOB-ID of the main menu and put in a command to just jump there.

It could help if you paste more sections of your IFO files like your VTS_01_1.IFO's 'Root Menu' PGC Command Table.

[agzz]

i replaced 1 and 2 with the third and it seams to work just fine.

I shoudl probibly read in abit on this whole thing.
you have any good reading ideas to recomend?

[roach76]

Derrow said he would make up a guide when he has free time to do with buttons so these commands will probably be in that guide.
Until then it's teach yourself through trial and error.

[texasermd]

I might be an idiot but I usually remove all the pre commands except 1 and on the first dvd have it jump to title x root menu (usually title 1) and have the second dvd just start the movie (usually jump title 1) This method seems to have worked about 90+ (180+ if you count mostly 2 dvd's per movie) times without problems for me.

[Yannis]

I am doing the same as texas###. It works fine for all disk splits.

[texasermd]

Also, you can add a post command to jump back to Title 1 Root and when the movie's done, it will jump back to the main menu. I have noticed some DVD's will hang at the end, some will restart the movie, etc. By placing the post command, when the movie's done, back it goes. This is good for the second DVD also.