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From: d@alice.UucP (Dan Rosenberg)
Newsgroups: net.video
Subject: RE: Slow dubbing VHS
Message-ID: <5085@alice.uUCp>
Date: Thu, 6-Mar-86 20:09:18 EST
Article-I.D.: alice.5085
Posted: Thu Mar  6 20:09:18 1986
Date-Received: Sat, 8-Mar-86 03:12:01 EST
Organization: Bell Labs, Murray Hill
Lines: 42

> I have a slight video problem that I need a quickie fix for:
> 	I am, along with six other students, producing a video tape on various
> subjects in physics. Several scenes MUST be in slow motion. All video was shot
> on a 1/2" VHS deck (Panasonic PV-8000) then dubbed up to 3/4" U-matic format.
> The scenes that had to be in slow motion were then dubbed up using the frame by
> frame "slow" advance feature of the PV-8000. In viewing the 3/4" tape, and the
> 3/4" composite master, we were quite pleased. Cheap, crisp, clear slow motion
> video. 

	I suppose I left out one important fact: The video was insert edited
on the 3/4" tape, which was (of course) blacked to a standard (N)ever (T)wice
(S)ame (C)olor video. Playing the 3/4" tape caused almost zero flutter of the
image, only the dubbing caused trouble.
	Fix: We noticed terrible video dubbing with the rest of the "mess"
(i.e., switcher, sync gen, and such) on. For some reason the 3/4" editor
likes to pay attention to its video input while playing. We have a patch
panel set up that defaults VDA 1 (Program) to VTR 1 (deck we dub from). 
Simply disconnecting the cable behind the VTR cleared things up. This
occurrence caused some consternation, because there is a switch to select
Sync input, and a separate sync input.
	If one disrupts sync to the switcher ("Un-Genlocking" it, turning
off sync generator) the 3/4" VTR's image is disrupted. Why would the VTR
care about video in during playback (esp if sync switch is set to "Normal",
which means, I suppose, from tape control track, and nothing connected to
sync in)? This switch also has "internal" (VTR's own sync), and "external"
(from TBC, or whatever): what should this be set to? Can't trust these
durn manuals any more!
	Result: We got 10 great dubs onto 1/2", and they play back rather
well even on the oldest VTRs. Rather amazing that we went from 1/2" to 3/4"
to 3/4" down to 1/2" and got video that was QUITE good. Strange, people used
to say (and still do) that 1/2" is S**T, and 4 generation was terrible...

	Again, posting this through a friend. Any mail to be directed to:
					...!ihnp4!charm!kalucki

		Thanks All:
			John Kalucki (Physics Research @ Bell Labs, MH, NJ)
			A quite silly student at:
			Governor Livingston Reg. H.S.

Bell Labs won't even admit that CE's exist, never mind have opinions, or even
worse (horrors) minds...