Output video+alpha from AJA using YUV 4:2:2 colorspace

I am trying to output 8-bit + 8-bit Key (Alpha) from AJA Corvid 44 12G in YUV 4:2:2 colorspace, but it doesn’t seem to work (Video Device Out can’t be started in this mode).

Video Device Out doesn’t complain in case I choose RGB 4:4:4 colorspace, but since I don’t have any device capable of displaying this signal, I am not sure if it actually works. This colorspace isn’t what I need, but I thought I would mention it in case it might help somehow.

Please are there some special steps that I need to do in order to make alpha work with YUV 4:2:2, or is this a bug? Thanks.

Can you tell me the resolution you are trying to run at?

I have been trying to output 1080p50, 1080p25, 1080i50 (all with the same result).

And what firmware do you have installed?

I am not at the PC right now, but I have installed AJA Software Installer v16.2.5 (found under Kona downloads at their site). Firmware on card was upgraded after installation - tomorrow I can check exactly which firmware is installed.

My guess is that you have the 8K firmware installed, which doesn’t have the CSC widgets, which are currently used for alpha output (RGBA → YUV + A). I’ll see if there is a way to do this without the CSC widget

Actually, it seems like that card has three sets of firmware:
DEVICE_ID_CORVID44_8KMK (8K: 4 FrameStores, 1 Mixer, 2 CSCs, no LUTs)
DEVICE_ID_CORVID44_8K (OEM 8K: 4 FrameStores, no Mixer, no CSCs, no LUTs)
DEVICE_ID_CORVID44_2X4K (2×4K: 2 FrameStores, 1 Mixer, 2 CSCs, 2 LUTs)
Likely you have the middle one, that has no CSCs. Can you try the first one instead?

@malcolm please where can I find the firmware with CSCs (DEVICE_ID_CORVID44_8KMK)?

I am looking at AJA Control Panel, but there is only one firmware available for me to use (if I click on the drop-down menu, I get to choose only this single firmware - which is already installed). I can’t seem to find detailed name of this firmware, but the description below says it doesn’t support CSC, so I believe you were right about it.

Oh, I was looking at AJA website now and this caught my attention:

As a registered Developer Program partner, you get access to top-notch development tools that help visualize your solution and simplify debugging and problem-solving — and AJA’s documentation will get you up to speed as quickly as possible.

  • Download SDKs, sample code, special firmware and more

So I am guessing I have to be in their Developer Program in order to get this “special firmware”? That sounds rather complicated… :roll_eyes:

I recall I have tried registering for this program couple years ago, but they send me some kind of contract stating I will have to develop AJA-based solutions for customers… Since I just want use their cards for some of my stuff, I cancelled the enrollment. :man_shrugging:

It’s probably worth reaching out to them to see how you can get other firmware. Certainly the 4k firmware should be available to you somehow…

Thanks, I will try to contact them… Anyway thank you very much for your help :slight_smile:

Correction - I have contacted AJA and it seems that I am not required to develop any software to join the Developer Program. Since alternate firmwares are only available to members of Developer Program, I will join it to get access to them.

An update on this, there is a firmware AJA is working on to enable this on the Corvid cards. Currently it’s still in beta though.