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Old October 12th 17, 04:45 PM posted to uk.tech.digital-tv
NY
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Default Timecode on programme-as-broadcast archive material

"Bill Taylor" wrote in message
...
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?


You'll notice that there's a clock before 10:00:00:00. If you start
the programme at 00:00:00:00 the clock would run from, say
23:59:30:00, which can be a trifle disconcerting.

10:00:00:00 was the BBC convention for complete programmes, but
inserts could be run from any time code which seemed appropriate.


Ah, of course. I was forgetting that a VT or film would need to start
running from a few seconds before the 00:00:00.00 point to allow for the VT
countdown clock. And as you say, it would look odd to see 23:59:30 in this
run-up. I suppose starting at 10:00:00 rather than (for example) 01:00:00
has the advantage that you just ignore the tens digit and then you have the
elapsed time of the programme (assuming it does not run for more than 10
hours).