Re: TV commercial timing?

On Thu, 24 Apr 2008, Hactar wrote:

> In article <67bnkhF2ng2uvU3@[EMAIL PROTECTED]
>,
> Greg Goss  <gossg@[EMAIL PROTECTED]
> wrote:
>> Bob Ward <bobward@[EMAIL PROTECTED]
> wrote:
>>> On Wed, 23 Apr 2008 21:09:35 -0700, Jim Ellwanger
>>> <usenet@[EMAIL PROTECTED]
> wrote:
>>>> In article <67a6ukF2nob0vU1@[EMAIL PROTECTED]
>,
>>>> Greg Goss <gossg@[EMAIL PROTECTED]
> wrote:
>>>>> Jim Ellwanger <usenet@[EMAIL PROTECTED]
> wrote:
>>>>>
>>>>>> And one more data point:  at one point, we were captioning "Hill
Street
>>>>>> Blues," which had originally aired in the early to mid-1980s. 
Those
>>>>>> shows were 51 minutes long.
>>>>>
>>>>> Is there a chance you might have been captioning the longer Canadian
>>>>> version of the show at 51 minutes?
>>>>
>>>> That may be possible -- I didn't realize they had done a less-edited
>>>> version of "Hill Street Blues" (or any other show initially intended
for
>>>> U.S. network TV) for the benefit of Canada.
>>>
>>> Apparently they were buying expanded television programming with their
>>> deflated dollars.
>>
>> I was in the studio audience for the filming of a game show once.
>> They wanted us to keep applauding while they ran the credits twice
>> while the host chatted with the contestants.  The US credits ran at
>> triple the speed of the Canuck credits.  I'm not sure what other
>> editing they would do besides the hyperspeed credits to make up for
>> the extra commercials on the US version.
>
> I've seen things in dramas (L&O and its ilk) that suggest speeding up
> the show without raising everything's pitch.  People walk and talk and
> music plays faster than normal, that sort of thing.

Time compression.  The system that I'm aware of -- but not at all familiar

with -- drops frames.  This isn't quite as much of a problem as one might 
think if the original material was shot on film since there are frames 
added in the conversion to NTSC video anyway.  Film runs as 24 frames per 
second, video at 30 (a tad less, actually, but who's counting?).  They get

around the difference by making every third video frame (composed of two 
fields each) half of the previous frame and half of the next frame.

Here's one system:
http://www.visualdatainc.com/time_tailor.htm

And 2:3 pulldown explained:
http://www.zerocut.com/tech/pulldown.html


-- 
"Thank heavens I'm atheist, otherwise I'd be in fear of going
to hell."   Veronique explains comparative religion.