Seamless angle linked in DSI

[Dimad]

I've seen disks with interleaved cells and multi angle disks when "seamless playback linked in PCI", but can not find a disk which has "Seamless angle linked in DSI". I'm starting to wonder if there is such thing, or it is just a part of dvd standart that no authoring software uses.

Can anybody name a dvd that has it?

[RB]

Hmm... maybe this is true for cells that are both multiangle and seamlessly branched? But I have yet to see such a DVD, although from what I've read seamless branching (IlVu in IFOEdit terms) can have multiple angles. Maybe MPUCoder can answer this ... :)

[mpucoder]

It seems there is a lot of confusion in this area. Seamlessly linked in DSI is for true multi-angle, the kind that you can switch during playback. The only example I've seen of this is on the demo disk that comes with DVD Demystified.

Seamless branching and ILVU (it's an L, not a vertical bar, acronym for InterLeaved Vob Unit) are not the same thing.

ILVU are used for either multi-angle (linked in DSI) and multi-story (linked in PCI). The typical use of multi-story is for credits in two or more languages, and being linked in the PCI means you cannot change the angle during playback. ILVU angles are mutually exclusive, only one can be seen.

Seamless branching, on the other hand, is the ability to jump over a cell during playback without any glitches. This is typically used for deleted scenes with another PGC that includes them. The maximum jump is 46 seconds (20000 sectors) if the total bitrate is 7000, the number of sectors decreases rapidly as the bitrate goes up.

Both ILVU and seamless branching can be used together, but with some restrictions.

[Dimad]

So there are three things:
ILVU cells: (Austin Powers: goldmember) two or more cells are interleaved (segments in vob file are mixed), cells are independant in a sense that they can be used in PGCs separately (there is ILVU flag, but no multiangle flags are set in pgcs)
linked in PCI: (StarWars episode2) two or more cells that can be used in PGC only at the same time as a consequtive pgc cells; they have same playback time; offset to next ILVU of the next angle is specified in PCI packet. I know they can be interleaved (can they be not?)
... being linked in the PCI means you cannot change the angle during playback.
WinDVD switches these at the end of ILVU segment, normal dvdplayer - does not.
linked in DSI: (have no example) two or more cells (i.e. different vob/cell ids) can only be used in PGC simultaneously (?), are necesarily interleaved (?); they have same playback time (?); offsets to next ILVUs of all angles are specified in DSI packet.

Am I missing something?