[theora] Cinema automation cues

Ricardo Costa hdvprojection at gmail.com
Sat Jul 17 11:59:43 PDT 2010

So, would it be better to work with this on the player end, with whatever
playlist formats are available there? This seems logical to use with events
between files in a playlist (between shorts, or in between the previews and
the feature) but with something like "lights-up-to-halflight" at the start
of the end credits of a feature, I didn't think the playlist would be
useful, since that's an event in the middle of a file (even if it is right
towards the very end).

Know what I mean? I'm on Linux, Ubuntu to be precise. What players would you
recommend to handle advanced options like this? I realize we might start
migrating off of the ogg topic right now, so my apologies ahead of time.

- Ricardo

On Fri, Jul 16, 2010 at 6:08 PM, Benjamin M. Schwartz <
bmschwar at fas.harvard.edu> wrote:

> On 07/16/2010 04:56 PM, Ricardo Costa wrote:
> > . Is there any way to tag or embed a theora video
> > file with any sort of cues at certain points in the program or
> > individual file (feature start, end credits, feature end, etc.) that can
> > then be turned into pulses for theater automation systems to cue lights
> > up, lights down, sound format switch, etc.? Thanks for any help.
> Theora (or more accurately, the Ogg container) does not have a standard
> system for coding these sorts of timed events.  You can easily create one
> yourself, though.
> My recommendation is to use a separate file containing a labeled list of
> timestamps within the video.  If it is important that only one file be
> used, you can encapsulate the contents of that file inside the Ogg file in
> a Skeleton "message header".  There are utilities and libraries available
> for easily reading and writing these message headers.
> --Ben

Ricardo M. Costa
Film & HD Video Projection
(323) 491-7346
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