I've been using Input Video for about a year on HDCAM 55's & 5800 with no problem.
It would not be my best choice but I had to one day and it worked great, so I've been doing it ever since
with no problems
---In Avid-L2@yahoogroups.com, <bigfish@...> wrote:
I found the problem. This was a new vtr position that had not been used before for an HD deck and the HD output of the deck is normaled to the HD deck input so it needed to be dead patched to avoid a feed back loop. I never ever ever feed video input to a deck when blacking because contrary to what you say it does have an effect on the servo reference if you are set to video input. The common issue I've encountered is your deck is being feed from the avid bay. I go to black a tape on the deck with it still feed the Avid output. I set the deck, be it digibeta or SRW 5500 and other Sony decks, to internal black generator. I start blacking and then I go back and quit out of Avid and open another project. The video startup glitches that are then feed to the deck will cause a servo rereference that you can hear at the machine while the drum servo tries to relock. I agree that if I'm set to external servo reference this might not happen but over the years I've seen many a time when locking the record machine to external and not incoming video can create issues if the timing of the decks input signal is out of it's window of acceptance.
When digital cutting I lock the avid to reference and I lock the deck to external reference and everything is fine. It's the fact that the SRW 5500 internal video generator seems to be vastly out of time with the rest of the world that I opted to use video reference for the servo when blacking internally. What is illogical is that if I set the deck to lock to input video and I set the machine to internal black the servo reference should be derived from the internal black signal and not what's being fed to the video input connector on the back of the machine. In this case the servo is not referencing the actual video signal and that's where problems crop up. It's from years of 3/4 inch maintenance that I'm sensitive to Record Lock Phase type issues and that's what I'm trying to avoid here. I could be I'm just being overly cautious but it's been working a long time for me.
When digital cutting I lock the avid to reference and I lock the deck to external reference and everything is fine. It's the fact that the SRW 5500 internal video generator seems to be vastly out of time with the rest of the world that I opted to use video reference for the servo when blacking internally. What is illogical is that if I set the deck to lock to input video and I set the machine to internal black the servo reference should be derived from the internal black signal and not what's being fed to the video input connector on the back of the machine. In this case the servo is not referencing the actual video signal and that's where problems crop up. It's from years of 3/4 inch maintenance that I'm sensitive to Record Lock Phase type issues and that's what I'm trying to avoid here. I could be I'm just being overly cautious but it's been working a long time for me.
--- In Avid-L2@yahoogroups.com, Mark Spano <cutandcover@...> wrote:
>
> You say:
>
> "To be safe when blacking tapes I unpatch any video input and I switch the
> servo reference to input video."
>
> to me, that means you are disconnecting ref. Don't do that, and your stop
> light won't flash. Leave it on External SD Ref and you're good.
>
> Patching and unpatching video inputs while the deck is set to Internal
> Video Signal Gen BLACK has no effect - and will not glitch at all.
>
>
> On Tue, Nov 12, 2013 at 5:32 PM, johnrobmoore <bigfish@...> wrote:
>
> >
> >
> > I do not disconnect Reference I disconnect the HDSDI video input. I've
> > found with Sony decks that even if you are set to internal video signal
> > generator if there is a glitch on the video input the deck burps. It
> > doesn't make sense but that's how they work. Because of this I always
> > unpatch any video input to the deck before blacking.
> >
> > Another thing I notice is the output of the deck changes drastically in
> > timing between normal input/EtoE mode and when set to internal signal
> > generator. Also when I switch to internal signal generator the stop light
> > starts flashing like there is some sort of reference issue. Because of this
> > I got in the habit of always setting the machine to servo reference the
> > video input when blacking tapes.
> >
> > I just got of the phone with Sony and I'm going to try a first birthday to
> > see if that alters the behavior. I'm not sure this is a problem but the
> > Sony tech confirmed you can black a tape with the machine connected to
> > nothing. In that stand alone mode if I am monitoring the composite
> > character output I wouldn't expect the character box to sway left and right
> > in the picture which is what I'm seeing now. I'm sure I'd have noticed this
> > before if it always behaved this way.
> >
> >
> > --- In Avid-L2@yahoogroups.com, Mark Spano <cutandcover@> wrote:
> > >
> > > Q: why disconnect SD ref when blacking tapes? Seems unnecessary. The ref
> > is
> > > for servo - if you have no reference, then servo just runs off AC mains,
> > > with all its potential irregularities. When blacking tapes, leave SD ref
> > > connected, set servo ref to external, and set internal video / audio
> > signal
> > > generators to black / silence.
> > >
> > >
> > > On Tue, Nov 12, 2013 at 4:50 PM, John Moore <bigfish@> wrote:
> > >
> > > >
> > > >
> > > > Got a rental SRW-5500 in today and I've set it up as I always do.
> > > > Starting with the Factory vtr settings and tweaking a few thing I
> > like. I
> > > > run with external sync from composite SD black when doing digital cuts
> > to
> > > > tape and it works fine. To black the tape I set the deck to black on
> > the
> > > > internal signal generator and silence for audio. Whenever I black tapes
> > > > using the internal generator I always notice the stop light flashes as
> > if
> > > > there was no sync or problem sync. To be safe when blacking tapes I
> > > > unpatch any video input and I switch the servo reference to input
> > video.
> > > > On today's machine when I looked at the composite character generator
> > out
> > > > while blacking I noticed the black box of time code was dithering left
> > and
> > > > right consistantly and then I noticed the front panel of the deck said
> > lost
> > > > lock. I busted the record and have found that unless I set the servo
> > > > reference to auto or external when blacking internally there appears
> > to be
> > > > some sort of unstable reference like issue. I have never seen this
> > > > behavior before and I've worked with this model a lot. You can black a
> > > > tape with the machine standalone with no signals using the internal
> > > > generators so why is this machine unstable when not set to reference
> > the
> > > > external sync source? This seems like a broke. Given I reset to
> > factory I
> > > > feel the main settings are correct. Perhaps there is some odd Novram
> > > > setting that is tweaked that I've never had to deal with. I do realize
> > > > that for some reason the internal video signal generator always seems
> > to
> > > > have a very different timing window compared to when the deck is just
> > > > inputting a regular HDSDI source but I never seen this instability on
> > the
> > > > composite output when blacking tapes. Anybody got an idea what might
> > be up
> > > > here?
> > > >
> > > > John Moore
> > > > Barking Trout Productions
> > > > Studio City, CA
> > > > bigfish@
> > > >
> > > >
> > > >
> > >
> >
> >
> >
>
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