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Author
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Topic: HFR - Dolby DSS200 and Barco DP2K-32B
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Antti Nayha
Master Film Handler
Posts: 268
From: Helsinki, Finland
Registered: Oct 2008
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posted 12-13-2012 01:51 PM
From the DSS200’s specifications sheet: quote: JPEG 2000 maximum bit rate 250 Mbps; supported frame rates 2D at 24, 25, 30, and 48 fps, 3D at 24, 25, and 30 fps
So you should be able to run 2D 48 fps, which has always been in the DCI spec anyway.
I’ve personally only ran 25 and 30 fps so far with a DSS200 + 32B combination. Both work flawlessly, except you need to close the dowser for a second or two during speed changes if you have several fps’s in one show – otherwise you get nasty color effects on screen as the Barco re-syncs to the new speed.
Has anyone actually ever seen a 48fps 2D DCP? As we know, there is no such version of The Hobbit (the 2D versions are 24fps only).
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Antti Nayha
Master Film Handler
Posts: 268
From: Helsinki, Finland
Registered: Oct 2008
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posted 12-17-2012 05:48 PM
quote: Steve Guttag 24 and other rates can be mixed in the show though as others have said, you will likely see what looks like a glitch on the transition between the rates. The average patron won't think anything of it but when you see the flash or so at the top of the screen...that is the change in rates.
I’ve seen a lot of really ugly speed changes on a Barco B + DSS200 combination, mostly going from 24 fps to 25 and back.
If a clip right before a speed change ends with any sort of picture – instead of a few seconds of black ”leader” – the final frame is frozen on the screen for a full second or so with seriously psychedelic colors. The average patron will certainly notice it (I heard them snickering). The same thing happens for the first frame of the second clip, right after the speed change, unless it starts with black.
The only way I’ve found to play a speed change perfectly, without any flashes on the screen whatsoever, is to use the dowser. This is how I build a multi-fps show:
- film clip (24 fps)
- dowser close
- 1 sec black (24 fps)
- 1 sec black (25 fps)
- dowser open
- film clip (25 fps)
Yes, I know, it’s ridiculous. You wouldn’t think this would be that hard to fix in the ICP software, would you…?
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