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Topic: How do you build a print when the leaders are all out of order.
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John Hawkinson
Film God

Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002
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posted 04-27-2006 08:34 PM
Presumably you can get a DA20 to tell the reel number on its serial output as well (how else could Dolby's Screentalk work?). And as you might expect, not only does the DTS-XD10 tell you the reel number, but so does its near-cousin the DTS-CSS.
But when we talk about matching up soundtracks, I think for the most part we mean by eye . Because the analog soundtrack leads the picture by 20 frames, the same soundtrack must be duplicated in two places. Because, e.g., for Reel 2, the changeover people need the sound to be on the head leader of R2, but the platter people need the sound to be in the last 20 frames of the film of R1.
This duplication (and the process which creates it) is called a "sound pullup."
So, lacking any special tools, your algorithm should be as follows: 1. Determine reel 1 and the last reel (from credits, etc.) 2. Rewind R1 tail-out and the last reel head-out 3. Attempt to match heads to the R1 tail and tails to the last reel head. 4. After matching a reel, rewind. 5. Match unmatched ends. Repeat steps 4-5 until done.
If you want to be really Hard Core (tm -- ), you can read the DTS timecode by hand. Each timecode sequence goes from tail-to-head, and the first 4 bits are a reel number (next 16 bits are the sequence number). A timecode sequence starts with a sentinel, which is a 5-unit-long white dash.
A zero is a two-unit dash, and a one is a one-unit dash, and both can be of either color. Other lengths (e.g. 3-unit to 7-unit long black dashes) are meaningless seperators.
Oh yes. And trailers are encoded as "reel 14." I don't recall how attached trailers are encoded; I suspect it is R14 as well. And if you read "reel 0," that means the following sequence number is the serial number. Skip that timecode and go on to the next one.
--jhawk
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