I am sad to find that VLC (1.1.8 ) since 1.1.0 still can't play many DVD:s without jerky motion.
As an example VLC (after 1.1.0) can not even play non-encrypted interlaced PAL DVD:s without jerking the image about twice per second. 23.976 fps NTSC DVD:s usually have jerky motion as well. VLC reports them as being 59.940060 fps and if that is true it probably explains why.
I started a thread some time ago here (and filed a ticket: #4412):
viewtopic.php?f=12&t=86154
Since then I found the problem to be identical on Windows, so I am hoping for some more interest by posting here. I am guessing it is not platform dependent.