[theora] Cinema automation cues

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

> 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.

Gstreamer. It can do everything, even if it can be a right pain to debug.

Here, you could use gst-launch to demux embedded text commands to
stdout as playback progresses, and have a shell script read those and
run whatever program controls the light system.

If you go the playlist (or external file) way, then you'd typically
run the player and the parsing/timing code separately. You'd have to
keep the two in sync though, if you're doing anything else than plain
play-forward.

For the text file embedded in a skeleton message header, you'd do the
second method, but with a preprocessing step to extract that info (eg,
using oggz-info, which I think will print out these headers).