[theora] Cinema automation cues

Benjamin M. Schwartz bmschwar at fas.harvard.edu
Fri Jul 16 18:08:46 PDT 2010

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.


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