PgcEdit is a DVD IFO editor designed to allow the modification of the navigation commands and parameters of an already authored DVD structure.
It is designed to supplement IfoEdit.
Any person eager to understand or modify the operation of a DVD knows IfoEdit (www.ifoedit.com). IfoEdit is an excellent freeware program which makes it possible to examine and modify (almost) all the information contained in the IFO files of DVDs. IfoEdit was written by Derrow.
Among ather things, IfoEdit allows you to modify the commands associated with PGCs (Program Chains). On this precise point however, it suffers from many limitations: it knows only some of the 41 existing commands, manages only some of the parameters of these commands, does not allow to create structured programs with conditions, branches etc... Moreover, it is very difficult to have an overall vision of all the commands of the DVD, because those are disseminated at various places in the DVD, among large amounts of other data.
I wrote PgcEdit to supplement IfoEdit. PgcEdit only enables editing the commands and modifying certain parameters of PGCs (Program Chains). On the other hand, it does not have the same limitations as IfoEdit: it allows one to edit all the commands with all their parameters, without other limitations than those imposed by the standard, and the philosophy of PgcEdit offers a better overall picture of the programming of the DVD. I have also added some functions as a bonus.
Furthermore, PgcEdit has a Trace mode allowing to follow the flow of the commands as they are played by a real player, watching the GPRMs, SPRMs and PUOs changes.
With this simulation, PgcEdit may be used as a powerful debugging tool.
PgcEdit is written in Tcl/Tk. Tcl/Tk is an interpreted scripting language. I
chose Tcl/Tk for its power in building interactive interfaces (GUI), and this is
a big deal: one needs a different dialogue box for each command! On the other hand, this choice has disadvantages: being an interpreted language, Tcl/Tk is slow. But that has only little incidence on PgcEdit. Another great advantage of Tcl/Tk is that an application can run indifferently on any platform which has a Tcl/Tk interpreter (Linux, Windows, MacOSX).

The license of this software is Freeware, you can free download and free use this dvd utility software.