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

Hans J. Koch hjk at linutronix.de
Fri Nov 14 13:42:36 PST 2008

On Sat, Nov 15, 2008 at 04:31:45AM +0900, Conrad Parker wrote:
> 2008/11/14 Hans J. Koch <hjk at linutronix.de>:
> >
> > I guess this is not neccessary. A simple chunk of metadata containing
> > the list of times at the beginning of a file would suffice. OGM simply
> > uses text stored in comment fields for that. I wouldn't recommend
> > comments for a general approach, but whatever format we choose, it
> > should probably not be too difficult to specify and implement it.
> >
> > Looking at some of the accessibility pages Silvia mentioned, I think
> > that ogg specs are very much focused on web video. I'll follow that
> > discussion and will remind ogg developers from time to time that there
> > are still one or two people who watch videos from good old files on
> > their disk ;-)
> that's a fair comment :-) we designed CMML for web video, and SIlvia's
> current accessibility work is targeting web video.

Nothing wrong with that :-) I think the concept of DVD-like chapters
could be used for web video too, as long as it is a file with a defined
length that is streamed. If I watch a video of some technical speech,
it'd be nice if there were chapters with names like "introduction",
"explanation of foo", "explanation of bar", "conclusion" and I could
jump directly to "conclusion" instead of watching the whole stuff or
trying to find the interesting part by randomly seeking around.

> For this discussion
> on generic Ogg mechanisms, perhaps we should take plain disk usage
> into account too ...

yep, the introduction of chapters would really be a good thing and would
take ogg one step further ahead of AVI.


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