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From: d@alice.UucP (Dan Rosenberg)
Newsgroups: net.video
Subject: Help w/VHS slow dubbing
Message-ID: <5031@alice.uUCp>
Date: Mon, 24-Feb-86 17:52:39 EST
Article-I.D.: alice.5031
Posted: Mon Feb 24 17:52:39 1986
Date-Received: Wed, 26-Feb-86 20:33:57 EST
Organization: Bell Labs, Murray Hill
Lines: 34

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. 
	Problem: The tape is to be distributed on 1/2" (i.e. for our home
collection, school's collection, and so forth and so on...) VHS. When we dub
down to 1/2" (not to the PV-8000, but just a 3-4 year old Industrial Quality SP
only Panasonic VHS) things begin to look funny. All of the standard play video
dubs fine, but the slow motion "rolls" a bit. It is not the type of rolling
that you get when you have the Vert. Hold set wrong on a monitor, but each
frame (of slow motion original video, not each frame of Composite 3/4") moves
down the screen as it is being played.
	I realize that our 3/4" editors clean up the video a bit, but things
look very bad on when played back on 1/2". There is no "video cheese" (our name
for cruddy looking video w/bad sync, or bad what have you...) on the 1/2" tape,
things hold together ... but there is the annoying roll.
	The project is wrapping up, and we will be ready to go in a few weeks,
so what I really need is a fairly easy (and CHEAP, i.e. no major outlay at all)
way to stabilize the video. We have a good deal of equipment, but don't know
exactly what to do.
	Idea: We have a sync generator. BB from this to 3/4" deck. Set 3/4" deck
to external sync. I would rather not do this unless I had a fairly good idea
that it would work. It would involve disruption of normal studio 
though.
	Please mail replys directly to:
			..!ihnp4!charm!kalucki
		or if you are on an Bell Labs machine in NJ:
			charm!kalucki

p.s. I am posting this through a friend.