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This topic comprises 5 pages: 1 2 3 4 5
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Author
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Topic: Help playing 4K content.
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Kirk Futrell
Film Handler
Posts: 95
From: Nashville, TN / U.S.A.
Registered: Nov 2008
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posted 05-29-2015 12:11 PM
This is what it looks like in device manager on the Doremi.
I tested Carsten's checkerboard patterns and I got a very similar outcome as the one I made. Which is just a gray wash, it looks the same as if you view the pattern on a computer without zooming in on it, because effectively computer is downconverting the image, just like something in the videopath is doing on our projectors or servers.
CARSTEN, when you looked at your tests on screen, did they look correct or did you get a gray image?
I even tried the "set 4K on" macro, but I think that may be left over from before the 2K / 4K playlist button.
Can someone with a Barco/Doremi-IMB 4K setup test one of Carsten's DCPs and tell me what they see?
I have not had time to remake the test dcp to be longer, but I will say that it looks the same in DCP-O-MATIC, OpenDCP, and the CineCanvas trial software.
Another thing to keep in mind is that Doremi has checked my log files and verified that the Doremi at least THINKS it is outputting 4K.
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 05-31-2015 04:55 PM
quote: Kirk Futrell
CARSTEN, when you looked at your tests on screen, did they look correct or did you get a gray image?
The Sony resolved the individual 4k pixels. I zoomed the lens to actually magnify the image/pixels as much as possible and stepped close to the screen to examine the checkerboard pattern.
Some colored edges due to small convergence issues or lens CA, but it was clear this was a 4k projection. I also intercut this with a 2k version to see the difference. The Sony, though, has no options to configure scaling or 2k/4k mode anyway. 4k is always 1:1, and 2k is always upscaled 1:2 using interpolation- that's it.
I don't think the J2k decompression of the Doremi will render 4k to a blurry grey with this source material. There must be something wrong with the signal processing pipeline, I don't think Doremi/Dolby is selling snake oil with the 4k license. I remember there was something like this in the early revision of the GDC IMB, though.
Hmm, I think I DO know someone with a Showvault/Barco 4k combo. I'll see wether he will try the test pattern.
- Carsten
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Kirk Futrell
Film Handler
Posts: 95
From: Nashville, TN / U.S.A.
Registered: Nov 2008
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posted 06-01-2015 04:06 PM
I just sent off another detailed report to Doremi this time while playing the 4K of Tales of Hoffman. I'll see what they have to say.
Here is a link to the 1 pixel line tests that are a bit longer and have audio. Not quite as useful as Carsten's checkerboards but here they are, none the less, and I have included the original .tifs .
https://drive.google.com/open?id=0B5BJx3weEYk8fnVYTWJVNXZ5N1JHbEk4Z2NqQUdHRDFUZlVGR1NUOWNzbDZUcEVIY2pvZDQ&authuser=0
quote: Marco Giustini
I know it may sound silly but, along with all the other tests you're doing, I would re-flash the firmware on the IMB.
I've never re-flashed an IMB, I'll see what the guys at Doremi think about that first. I don't want to brick my IMB, is it fairly safe?
quote: Marco Giustini
I wanted to say that I am playing with a Barco 4K with Doremi IMB and 4K is rendered properly, no scaling.
Would you mind using either the test that Carsten posted or the one I posted above, just to make sure we are comparing apples to apples? I really appreciate you checking it out on your end!
quote: Marco Giustini
Silly idea: did you try deleting and re-creating the projector under devices?
Seems worth a shot, after all I did acquire the 4K license after I had installed it.
quote: Lyle Romer
When you create and view a 4k checkerboard, how close to the screen (and what is the size of the screen) in order to actually be able to see the black and white pixels?
FWIW When I ran the 4K test pattern (that worked) and compared it to the 4K DCP (that didn't) you could see the difference from the booth (70 ft), the 4K test pattern appears much brighter because half the screen is white instead of all the screen being gray. To actually see the lines you needed to be about 15 to 20 feet away or closer (don't quote me on that, I can't quite remember.)
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