Comments

john-beale wrote on 3/7/2003, 1:54 PM
I've not found any support for GPRM access, I believe it's considered a "professional" feature, as in "no one using an authoring package under $5000 should even know about this".

Examining the DVD-A generated IFO files in IfoEdit I see that register 0, 1 and 2 is set to 1, but no use seems to be made of this information.
efiebke wrote on 3/7/2003, 2:07 PM
O.K.. . . What's "GPRM"????? I'm curious!

Ted
jbeale1 wrote on 3/8/2003, 2:32 AM
The DVD standard specifies that the DVD player has 16 general-purpose, 16-bit registers which can be used to store data by the DVD "program" on the disc. These are called General Parameter Registers or GPRMs. They have two modes, as a register in which you can store any 16-bit integer, or as a counter, in which the register value is incremented by 1 each second. There are commands which can set, test and conditionally branch based on the value of any register. These Pre- and Post-play commands can be attached to a menu button, or a segement of a video.

So far only the very expensive "pro" level authoring tools allow access to the GPRMs. For simple DVDs you don't need them, although they would be very handy if you want to author your own "game show" disc for example, where you are keeping track of a player's score.
CrazyRussian wrote on 3/8/2003, 6:35 PM
Or more simpler example is: chapters menu with many buttons , like one for music DVD, where user can select clips individualy... if let's say users scrolls down to button #10 and menu loops... guess what, button #1 is selected by default again, using registers you can tell dvd to select button #10 after loop