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camera sync for UVW-1800?

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mortimer heathcliff
camera sync for UVW-1800?
on Jan 3, 2007 at 6:10:50 am

okay, ultra-low-budget questions here. i'm trying to capture VHS footage into FCP via my Decklink card and i have no black burst generator (but will be getting one this month). this set-up has worked fine for capturing from my UVW-1800 (with sync via the "loop-through" method), but when i capture through the Beta deck from a VHS deck, i keep getting loss of sync. so, i hooked up my Betacam camera to one of the Ref inputs, and got sync, but could not get rid of the slowly rolling black horizontal bar. any ideas to make this work (without getting the black burst generator?)



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Thax
Re: camera sync for UVW-1800?
by
on Jan 3, 2007 at 12:03:14 pm

VHS can be subject to severe TIMEBASE errors (video NOT playing at the standard and constant frame-rate).
A monitor can usually compensate for these, but they can wreak havoc when trying to dub to another video device (which is attempting to record the video frames at a more precise and constant speed.)

The best way to dub a tape with poor stability is to connect its deck through a true timebase corrector (TBC) and/or frame sync device (with a large enough "window" to compensate for the non-standard source.

Or, if you have access to a small digital "Video Mixer" (more precisely called a digital Video SWITCHER),
Panasonic, Videonics (now called Focus) and DataVideo all offer these units.
The switchers can act as effective TBCs because they use internal digital clocks to "create" a stable video signal even from from various "un-sync'ed sources.
So you can feed your unstable VHS (or other source) into the switcher and send the switcher's "stable" output to your record deck.

Edirol:
http://dvcreators.net/video-mixers

Panasonic:
http://www.studio1productions.com/vid102.htm
http://www.studio1productions.com/vid100.htm
and others

Focus:
http://www.focusinfo.com/solutions/catalog.asp?id=10

And the best of the bunch, DataVideo:
http://www.datavideo-tek.com/products/se_800_main_page.htm

Certain of these video switchers can usually be rented from companies that set-up "Hotel Ballroom Events" in most cities.


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mortimer heathcliff
Re: camera sync for UVW-1800?
on Jan 4, 2007 at 7:05:32 pm

i just went ahead and dubbed it all to Beta, then captured normally. it looks great, but, of course, took twice as long. from your guys' experience, are you getting "more stable" VHS by running the VHS deck through a TBC or black burst generator, as well as then by-passing the dub-to-Beta workaround? just wondering if the added expense of the bb generator would be worth it, since the vast majority of my work is to and from Beta and i have no sync problems now without the bb gen. . .



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Chuck Reti
Re: camera sync for UVW-1800?
on Jan 4, 2007 at 5:48:27 am

Simply just dub the VHS to the UVW. Then capture the beta dub. Generally works just fine unless the VHS is an absolutely awful multi-generation dub (rather than a normally awful VHS).


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