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Re: Y2K, HDTV and Telecine



In a message dated 97-12-14 01:03:17 EST, Mike Orton wrote:

<< In fact, Christopher, you are incorrect that "its not so simple", for one
 very good reason: Very soon, the majority of material going to air will
 have been originated or edited in the *component* domain. There it is
 downright bloody easy to drop 0.1% speed. >>

Mike, 

It doesn't make any difference what frame rate video (or film for that matter)
runs at.  Clocks and watches still keep the same time--seconds, minutes, and
hours don't change--whether you're watching film at 24 FPS, PAL video at 25
FPS, NTSC video at 29.97, or computer video at any other rate!  

Consequently, if you convert 59.94 fields/sec to 60 fields/sec, you will
either have to repeat video fields and "stretch" the time code numbers, or
accept programs that end short of their running times and have time codes that
doesn't match the clock.  Neither of which are desriable for broadcasting.
Converting from 60 fields/sec to 59.94 fields/sec brings back exactly the same
set of problems drop frame time code was meant to solve, except now you'd have
to drop the actual video frames along with the time code numbers.  It wouldn't
make the least bit of difference if the video originated in component or
composite.

As I pointed out previously, most ordinary NTSC television sets would not be
able to receive color if the frame rate was changed from 29.97 to 30 FPS.
Yes, those having monitor, Y/C or "S" video inputs could probably handle the
faster frame rate, but they would still require external converter boxes to
receive broadcast color.  While the advantages of dumping the 29.97 frame rate
are quite apparent, and it definitely appears as though that's exactly what is
going to happen after NTSC bites the dust (since most recently announced DTV
equipment works in either frame rate), forcing a change right now would only
increase costs for everybody, slowing down the changeover to DTV and causing
far more trouble than the singular result of no longer having to deal with
drop frame time code would be worth.


Best regards,
Christopher Bacon




---
John Abt of AJA Video in Grass Valley supports the TIG in 1997-8
TIG subscriber count is 908 on Mon Dec 15 13:05:15 PST 1997
complete information on the TIG website http://www.alegria.com/tig3/



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