The Avid burps are random and could be coming from a myriad of reasons. It's not that they are locked to internal reference in these cases. I think it's usually a disk underrun or throughput error. If Avid sent a record off strobe before burping I don't think the glitch would happen. I don't know if that would even be technically possible in the Avid architecture. It remind me of my Dad's saying, "Why didn't you say something before you spoke?" ;-)
--- In Avid-L2@yahoogroups.com, Dennis Degan <DennyD1@...> wrote:
>
>
> On Nov 12, 2013, at 8:44 PM, johnrobmoore wrote:
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> > This where I disagree with referencing to input video for the SRW 5500 and similar decks. When I'm outputting to these decks if the Avid burps it sends an unstable signal to the record deck before the record off strobe has gotten to the deck. You can hear the results if you are near the machine. The drum servo will do it's best to resync to the unstable signal. This puts a for all intents and purposes permanent glitch at that point in the tape. It is very much like a hard record punch in, although that may not what is actually happening it acts like the punch out of an asssemble edit. There is no way to remove this glitch except for making an assemble edit to the end of the tape. As I've already mentioned earlier in this thread this is a very bad thing, especially when you are trying to punch in a fix in the middle of a master.
> > Through trial and error I have found that if I set the SR deck to external reference when the avid burps the deck doesn't try to resync to the unstable signal and therefore doesn't make the permanent glitch. This method is not full proof but it certainly has reduced this problem for me. So because of this behavior of SR decks and perhaps HDCam decks I always use external reference whenever possible.
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> I say:
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> The servo might be more stable this way, but the recorded video must still have some kind of disturbance at the point of the Avid 'burp'. If so, though you have a mostly good recording, there is still a problem in the video. If your Avid 'burps' like this, the problem needs to be fixed at the Avid. Possibly, there's no reference feeding the Avid, or it's set to ignore that reference. Still, I see your point about avoiding a permanent 'glitch' and see why this may work.
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> Dennis Degan, Video Editor-Consultant-Knowledge Bank
> NBC Today Show, New York
>
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