Print to DV tape & it plays perfectly, but dub to VHS it's noisy .

tedbuchanan wrote on 3/25/2001, 2:03 PM

I render to DV, then print to mini-DV tape, and play it to
external monitor. PERFECT. Then I dub the DV tape to VHS or
S-VHS tape, and play on a normal VCR. There's annoying
noise in spots, most noticeable in the faces of people
during slo-mo's and stills, but in other places too like on
black or patterned places, and/or when the gain was up
quite while shooting.
If the VCR has a TBC (time base corrector) or any type of
DNR (digital noise reduction), it plays beautifully.

Short of giving my clients a VCR with TBC, is there anyway
to lessen this noise? THANK YOU!!!!
??Is there some box or something that I could buy to go
between the machines on the final dub from DV to VHS?

More info:
-- I had resample on when I rendered the stills and slo-
mo's in VV. IF I didn't they would have had lots of shake.
-- There is no noise when I play the DV tape to an external
monitor.
-- I use JVC HR-DVS1U which lets you dub DV to VHS within
the same machine. Even playing the resulting VHS on the
same machine, there is noise in the VHS.
-- I've tried 20 other combinations of dubbing (from the
camera, from/to other VCR's...) and playing on every type
of VCR. Still the noise.
Any ideas???? I would be so happy.

Comments

SonyEPM wrote on 3/26/2001, 9:28 AM

We anticipated this early on but this is the first report.

The problem could be the DV signal might be too hot and/or
the vhs machine can't deal with the that signal.
(The "noise in bright scenes" problem is really common with
misadjusted boroadcast transmitters, and this sound like
the same thing.

You might try adding the "broadcast colors" filter to the
entire project (add it onto the video preview monitor).
This "soft-clamps" all colors to their legal range for NTSC
or PAL.

Please let us know if this helps-

tedbuchanan wrote on 3/26/2001, 10:10 PM

Thanks for so quick response. You are the best!!!!
I will try broadcast colors in the morning. Actually I
looked at that filter, but wasn't sure which settings to
try: In the Broadcast Colors filter, there's a default that
sets "smooth upper bnds" at 1.000, and there's a "clamp"
preset that sets upper bnds & lower bnds to "0". Is it
the "clamp" preset that I want? or do I want both the upper
and lower bounds set at 1.00?
Do u think this could have been introduced in the 2.0d VV?
If so, just for a "moment" I will go back to 2.0b, just to
finish this project because this looks even worse on my
client's panasonic flat screen tv. I guess really hot is
the way to describe it.

tedbuchanan wrote on 3/27/2001, 10:34 PM

I put broadcast colors filters on. I tried the "default",
the preset "clamp" and other combinations of upper bound
and lower bound settings. No matter what I try, the noise
is still there. It's looks real bad.
If u think it is problem because of DX8, let me know. I'll
go back to DX7.
Any other suggestions, let me know, I'll try them. Thank
you.
My head hangin real low in the meantime....

SonyEPM wrote on 3/28/2001, 8:52 AM

As you said DV output from camera is fine, TBCing this
works, so it may be your only option.

I've tried dubbing our DV files off to VHS and don't get a
repro. Still investigating.

Maybe your video input levels are too hot on your SVHS
record deck? Is this an s-video transfer from DV to SVHS?

tedbuchanan wrote on 3/30/2001, 11:14 PM

Yes, I'm doing a DV transfer to S-video, within same VCR (a
JVC that has both DV and S-VHS slots). I also get same
noise as transfer from Canon GL-1 DV cam to another S-VHS
VCR.

What would u think about me sending you a rendered 3 or 4
second clip which for me shows the noise when transferred
to s_VHS. The rendered clip would be result of following
activities
a) DV shot on Canon GL-1 DV camcorder
b) DV tape captured via VV capture utility 2b.
c) Veg file (VV 2.0D) created where I made a few seconds of
still frame and/or slomo
d) Rendered to avi file with NTSC template.

...I am not trying to get out of paying support and would
gladly submit problem to them and pay if that is what u
suggest.
P.S. I can't adjust my levels on my VCR but my previous
stuff on VV2b with DX7 were fine. I think I can borrow a
VCR with levels if necessary.
Thanks again. Barb Dulick.

SonyEPM wrote on 4/2/2001, 11:25 AM

You can send these to me (keep 'em small). Before you do,
can you confirm that the noise is not present when dubbing
raw, original footage from the camera to the deck (no
software involved in the process)?