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Obsidian and 4K 422-10 bit
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droza  
#1 Posted : Thursday, October 12, 2017 11:07:55 AM(UTC)
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I just finished watching your first 4K 60p stream (https://www.youtube.com/watch?v=WbmQSe9xkr8). Very impressive - congrats!

The green screen looked really good. I know that both the GH5 and the AVX200 can output 4K 4:2:2 10-bit, which can be helpful to get a really professional looking green screen effect, and it seems both the Magewell and the Yuan card support input at those color sampling and depths as well.

So, I was wondering what color format you were using for your live show. If it wasn't 422 10-bit, how does 422 10-bit work? Does VMix support that color sampling and depth for the actual green screen processing (even if final output is 420 8-bit), and does it pose any problems for the Obsidian system? Thanks.
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admin  
#2 Posted : Thursday, October 12, 2017 11:48:16 AM(UTC)
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For our show we actually used 8-bit 4:2:0 from both cameras.

GH5: Supports 10-bit 4:2:2, however Yuan did not accept the signal, so output was set to 8-bit 4:2:0.
DVX200: Supports 10-bit 4:2:2 only at 24p, 8-bit 4:2:2 at 29.97p, outputs 8-bit 4:2:0 at 59.94p which was then input into the Magewell.

vMix itself supports up to 8-bit 4:2:2 from most capture cards and then upscales this to 32-bit floating point 4:4:4 for all video processing
which helps a lot with things like chroma key processing.
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RobLambert on 10/12/2017(UTC)
droza  
#3 Posted : Thursday, October 12, 2017 12:01:46 PM(UTC)
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Thanks for the quick and detailed reply.

You mentioned the Yuan didn't accept the GH5 signal at 422. If you have a chance, would you mind testing the GH5 to Magewell at 4K 60p 422? I wonder if that card would work properly accept the signal.
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RandomStreamer  
#4 Posted : Tuesday, November 7, 2017 5:45:34 PM(UTC)
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droza wrote:
Thanks for the quick and detailed reply.

You mentioned the Yuan didn't accept the GH5 signal at 422. If you have a chance, would you mind testing the GH5 to Magewell at 4K 60p 422? I wonder if that card would work properly accept the signal.


Also interested in it. I use GH5 for my productions, and would like to get a new capture card which supports full power of the beast :)

thanks
RS
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floz23  
#5 Posted : Sunday, September 9, 2018 3:03:14 PM(UTC)
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Hi, I'm reviving this discussion because I'm in the process of figuring out all the same things. GH5 can output some REALLY NICE COLOR over HDMI! Now I'm trying to confirm a few things. Will the magewell 4k hdmi capture card pickup the GH5 4:2:2 8/10bit color. Can vmix make use of these high bit rate frame/color formats (Admin answered above I think).

From magewell's website: http://www.magewell.com/...pro-capture-hdmi-4k-plus
Support for capture image resolutions up to 4096x2160 pixels
Support for capture frame rates up to 144fps (Actual capture frame rate can be limited by PCIe bandwidth & image resolution)
Support for 4:2:0 8-bit capture formats: NV12, I420, YV12
Support for 4:2:2 8-bit capture formats: YUY2, YUYV, UYVY
Support for 4:4:4 8-bit capture formats: V308, IYU2, V408, BGR24, BGR32
Support for 4:4:4 10-bit capture formats: V410, Y410
More capture formats are supported via Magewell Capture SDK for DirectKS

I plan on ordering one of these magewell cards, and renting a gh5s for testing!
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floz23  
#6 Posted : Sunday, September 9, 2018 3:23:24 PM(UTC)
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I went and check official specs from Panasonic. https://www.panasonic.co...meras/dc-gh5l.specs.html

In the interface -> hdmi -> monitor through section:
4:2:2 10-bit (When [Rec Quality] is set to [4:2:2 10bit] or when [Rec Quality] is set to [4K/60p]/[4K/50p] and [4K/60p Bit Mode]/[4K/50p Bit Mode] is set to [4:2:2 10bit]. When [4K/60p]/[4K/50p] mode is selected in [Rec Quality], it is not possible to record motion picture or still picture on the SD memory card in the camera unit.)/4:2:2 8bit (When [Rec Quality] is set to [4:2:0 8bit], except for [4K 60p]/[4K/50p])/4:2:0 8bit (When [Rec Quality] is set to [4K/60p]/[4K/50p] and [4K/60p Bit Mode]/[4K/50p Bit Mode] is set to [4:2:0 8bit].)/Auto / 4K/30p/25p / 1080p / 1080i / OFF/Information display ON/OFF (selectable)/Automatic down-conversion/HLG View Assist (HDMI) AUTO / MODE1 / MODE2 / OFF (selectable)

maybe this suggests that we can only get 4:2:2 8bit with 4k/30p or less?
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