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Old October 12th 17, 05:04 PM posted to uk.tech.digital-tv
The Other John[_2_]
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Default Timecode on programme-as-broadcast archive material

On Thu, 12 Oct 2017 12:07:21 +0100, NY wrote:

This is probably a weird, obsessive question...

I've noticed that if you see a programme from a tape archive (eg BBC's
Windmill Road) with burnt-in timecode, the TC often begins at 10:00:00
rather than 00:00:00. An example is
https://www.youtube.com/watch?v=Yf3zE0x_dkI Is there a reason why they
chose to begin the TC at a "zero" of 10:00:00?


Early time code based video tape editors were unable to cue up a tape for
an edit at 00:00:00:00 because a 10 second pre-roll would need to be at
23:59:50:00 which the edit controller would see as 23+ hours into the
tape. In other words it couldn't handle a negative pre-roll, I don't know
if later ones could but of course now it's all non-linear editing they can
handle anything.

--
TOJ.