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Obsidian and 4K 422-10 bit
droza
#1 Posted : Thursday, 12 October 2017 1:07:55 AM
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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.
admin
#2 Posted : Thursday, 12 October 2017 1:48:16 AM
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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.

1 user thanked admin for this useful post.
RobLambert on 12/10/2017
droza
#3 Posted : Thursday, 12 October 2017 2:01:46 AM
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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.
RandomStreamer
#4 Posted : Tuesday, 7 November 2017 7:45:34 AM
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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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