[Avid-L2] Re: HDCam SR 24p q

From my experience that is what creates the phase offset. If you are in a mode that allows for phase adjustment relative to the genlock input you can adjust the phase to hopefully be in spec, not sure what the exact spec is. It might be in the Evertz manual. Think along the lines of SCH RS-170A which was a relationship between sync and subcarrier. This is not related to sub carrier but there is a relationship between SD black sync and Trilevel and there is a co existance point they determine to keep everything happy in various environments especially telecine.

As far as locking true 24 to 29.97/59.94 it won't work. The two rates will drift apart over time. (Think asynchronous time code) Eventually something burps to get back into sync. That might be the glitch you're seeing. I'd be surprised if the Evertz allows genlocking in a true 24 mode but it sounds like that's what might be happening. If you're really curious find your self an old composite waveform and lock it to house black. Feed the input the trilevel signal and look on a frame rate time base. It's not perfect but you can see if the two signals are locked, look for the broad pulses to see if they drift.

Gee and I thought this was going to be boring. Can't wait to get home and tell my wife about it. ;-)

--- In Avid-L2@yahoogroups.com, "Ken Sirulnick" <kenavid2@...> wrote:
>
> Our Evertz Tri Level is locked to house black. Is that an issue with true 24p?
>
>
> ----- Original Message -----
> From: johnrobmoore
> To: Avid-L2@yahoogroups.com
> Sent: Friday, January 08, 2010 3:23 PM
> Subject: [Avid-L2] Re: HDCam SR 24p q
>
>
>
> I have had problems with an Evertz Tri level sync generator when it was gen locked to house black. Obviously in true 24 you don't want it gen locked to house black. Is your Evertz generating house black and Tri Level or is it gen locked. There are some modes where you can adjust the Tri level phase relative to the gen lock input but some you can't. I was stuck with a mode generating two outputs of 23.98 Psf and it would not allow for phase adjustment. The resulting problem was the Format Convert output for the downconvert was a frame off when capturing into the Avid. Replacing the Black generator and the Evertz Tri Level generator with a gen 10 solve the off set on capture. Very subtle buggy problem. The way Evertz discribed it to me is some modes don't allow for a distinct phase relationship between black and Tri Level hence some modes allow phase setting and others are clock locked. It was really frustrating because the card I was using was really meant to go into one of their chassis that had multiple DAs to get more than one tri level output. Setting the card to get 2 Tri Level outputs on it's own forced a fixed phase output that was just too far out to get a proper dual locked pull down from a 5500.
>
> One thing I've noticed is when set to auto or video input servo ref you run an increased risk of punching a CTL like hole in the master tape if the output stalls or you hit space bar. On a glich during output the Avid spits out video garbage momentarily and this happens before it halts the record process. The deck when referencing video input proceeds to make what looks like a bad assemble edit out on the tape and you have to make an assemble edit from that point on to fix it. Not Fun.
>
> --- In Avid-L2@yahoogroups.com, "Ken Sirulnick" <kenavid2@> wrote:
> >
> > So we figured it out. Setup Menu 5 "Servo Ref" was set to EXT. Set to Auto and it worked. No glitches and was able to insert edit to tape. Apparently, using External Servo Ref, can be an issue if the Reference phase is different from the input video phase. The Evertz Tri Level sync generators give you a choice between Clock and Phase locked reference. I had it set to a 1080p 24 CLOCK ref. Maybe a Phase locked setting would have worked, but the Auto setting on Menu 5 fixed the problem.
> >
> > KEN
> >
> >
> >
> >
> > ----- Original Message -----
> > From: Job ter Burg (L2B)
> > To: Avid-L2@yahoogroups.com
> > Sent: Friday, January 08, 2010 1:41 PM
> > Subject: Re: [Avid-L2] HDCam SR 24p q
> >
> >
> >
> > "Ken Sirulnick" (08-01-2010 16:37) :
> >
> > > When I output to HDCam SR (SRW5800) with 24p TriLevel Sync there
> >
> > Are you sure your sync is set to 24.00PsF as well?
> > Some BBGens (like the AJA one) only do 23.976PsF. That might cause issues
> > for your when you are at 24.00.
> >
> > --
> > Job ter Burg
> > film editor - NL
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

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