[DVDnav-discuss] DVD works with dvdnav but not with dvdread

[Nico Sabbi]

On Wednesday 10 December 2008 10:36:46 Frederik Holljen wrote:
> > ever heard of crippled dvds to prevent copy? Relying on the
> > DVD-VM that dvdnav uses but dvdread doesn't is one of those nice
> > practices
>
> I've heard of this yes. But it still seems strange to me as a user
> that it works with one and not with the other. I'm using vlc to
> convert various dvd content to transport stream and using dvdread
> is the best option since I'm not interested in ripping menu's etc
> :)
>
> If you don't mind answering my newbie questions:
> What does the DVD-VM do? Why do you use it in dvdnav but not in
> dvdread?
>

the VM executes a set of commands inserted in the navigation packets.
Dvdread is not done for that work: it's a very low level library to
access the lowest level of the dvd data; dvdnav uses dvdread, it
doesn't duplicate its job