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Author
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Topic: Changeovers care about head lengths...
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John Hawkinson
Film God
Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002
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posted 10-20-2002 09:25 PM
[ I originally decided not to post this, but it kept bothering me. I hope it is not mis-interpretted as an attack, but rather as a factual correction; I decided it was too chit-chatty for FITA though. ]In the Bloody Sunday thread in FITA, Brad notes the heads are 2' short, and goes on to say, "Changeover theaters should not be affected." That's not true though...changeover theatres who don't notice will fail to project the first 2' of each reel; to avoid this, it is necessary to thread each reel 2' higher up the countdown than otherwise. --jhawk
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Steve Kraus
Film God
Posts: 4094
From: Chicago, IL, USA
Registered: May 2000
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posted 10-21-2002 12:52 AM
John I think maybe you misunderstood what Brad was saying. I think you're thinking Brad meant that the leaders are 2' shorter than normal hence your point about cueing up 2' farther back at least in terms of leader marking. But I don't think that's the case and I sure didn't notice anything like that when I ran it via C/O.No, I think his point was that they neglected to do a sound "pullup" which is where they duplicate 22 (or more) of sound from the head of the next reel and put it onto the end of the prior reel. Because of the offset between picture and track, the track for the beginning 22 frames of the film is out on the head leader...that's what is going through the soundhead as the first 22 frames of picture are projected. With no sound pullup the last 22 frames of picture will have no soundtrack next to it--nor should it since there is no need for sound after the last frame of picture. Someone building reels on a platter is going to be cutting at or near the first frame of picture, ignoring the soundtrack. So without sound pullups you'd have almost a second without sound at each join because the sound from the prior reel ended and picture from the new reel is on screen but that film hasn't yet cleared the soundhead. Sound pullups avoid this, and AFAIK have been done long before the popularity of platters. (They need only be 22 frames but I often see modulation going way beyond so I think now with digital workstations they're just lifting a couple of seconds off the next reel and grafting it on.) Anyway, Brad's advice was to cut the leaders and assemble the print so as to include the bit of black leader that contains the beginning audio for each reel. At least that's what I got out of it.
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for not paying sufficient attention to Brad's post. Every time it got bumped up it kept tugging at my brain, but each time I happened to reread it this escaped me. So it goes...
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