[ogg-dev] video chapters and subtitles in ogg containers

[ogg.k.ogg.k at googlemail.com]

> You don't have to parse the whole file, just enough to find all the
> chain boundaries. That can still take some time, of course.

Don't you have to parse the whole file to find those ?
Technically, if you find two packets with the same serialno,
it is possible that they'd be *different* logical streams just
happening to have the same serial, which would be OK if
there was another stream in the middle with *another* serial.
OK, maybe that's very unlikely, but still legal.