[vorbis-dev] granulepos start/end revisited

[Arc Riley]

On Mon, May 24, 2004 at 04:21:09PM +1000, Silvia Pfeiffer wrote:
> No, offense, but I do believe there is a need for exact durations and 
> for the flexibility to insert subtitles on the fly during live 
> productions. And I've worked with a captioning company before and they 
> were very picky on exactness of timing.

Writ already has exact durations and flexibility to insert subtitles on 
the fly during live productions.  What it doesn't have, and what I 
strongly feel that it doesn't need, is the ability to decide the 
duration after the phrase has been defined.

And if it does, you can always use several one-granule phrases and it'll 
work just fine.  Those poor, poor people trying to transcribe while 
also controlling the lengths of the transcriptions.  "Oh, shit bill, 
you've had that word on the screen 30 seconds longer than it should have 
been!"

But then again what's your concern?  Annodex already provides subtitles, 
doesn't it?  Wrapping Ogg up in it's own container format with the 
subtitles and everything else.  So for your customers doing live events 
where they absolutly need hypertext links and all that jazz, you won't 
be using Writ anyways because it'd be redundant.

For a vast majority of the broadcasting world, where transcriptionists 
are trained for Line21-based closed captioning systems, being able to 
erase text at exact times is completely beyond the scope of what they 
do.  To the point of being rediculous.  Their job is to hammer the words 
out as quickly as they can and let them expire as they roll off the top 
of their window.  A default timeout will expire the last words on-screen 
after a preset amount of time.  They don't worry about what's on the 
screen or for how long, nor do they even care if it's 100% accurate.

Plus, if they want the transcribed text on the screen in a timely 
fashion they're going to put single or double letter phrases anyways, 
compiled into the same window, and trying to then go back and tell each 
letter to delete?  Woah.  No way in hell.  Even if the machine does this 
for them, sending stop-packets for every letter?  Too much overhead.

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