UltraStudio 4K Mini + bt.2020

[Sidonai-1]

I'm currently testing the thunderbolt UltraStudio 4K Mini and I noticed that it Failed to schedule primary video if I try to configure the decklink at bt2020.
16bits + yuv work normally on their own, only failing when you also change the color space.

In the SDK it does mention that keying at bt2020 is not supported, and since this device has a A+B (fill+key) outputs, I guess that's where the incompatibility comes from.

The higher bit depths are used mostly for LED videowalls, so I'm wondering if there is a way to support bt2020 for the fill, ignoring or disabling the key output in those cases.

The Decklink Extreme cards probably suffer from the same issue, I haven't tested them in a while though.

Environment

• Server version: 2.5 Stable
• Operating system: Windows 11

[niklaspandersson]

Can you provide the decklink part of your config for this setup?

[Sidonai-1]

I tried various combinations of the , but knowing that it doesn't support it the only that makes sense is the default (external)

<channels>
    <channel>
	<color-depth>16</color-depth>
        <color-space>bt2020</color-space>
      <video-mode>2160p2500</video-mode>
      <consumers>
        <decklink>
          <device>1</device>
          <embedded-audio>true</embedded-audio>
          <buffer-depth>4</buffer-depth>
        </decklink>
      </consumers>
    </channel>
  </channels>

produces this:

[2026-02-28 22:38:09.902] [info]    UltraStudio 4K Mini [1-1|2160p2500] Enabled embedded-audio.
[2026-02-28 22:38:09.902] [info]    UltraStudio 4K Mini [1-1|2160p2500] Disabled low-latency mode.
[2026-02-28 22:38:09.902] [info]    UltraStudio 4K Mini [1-1|2160p2500] Enabled external keyer.
[2026-02-28 22:38:09.902] [error]   UltraStudio 4K Mini [1-1|2160p2500] Failed to schedule primary video.
[2026-02-28 22:38:09.902] [error]   UltraStudio 4K Mini [1-1|2160p2500] Failed to schedule primary video.
[2026-02-28 22:38:09.903] [error]   UltraStudio 4K Mini [1-1|2160p2500] Failed to schedule primary video.
[2026-02-28 22:38:09.903] [error]   UltraStudio 4K Mini [1-1|2160p2500] Failed to schedule primary video.
[2026-02-28 22:38:09.903] [error]   UltraStudio 4K Mini [1-1|2160p2500] Failed to schedule primary video.
[2026-02-28 22:38:09.903] [error]   UltraStudio 4K Mini [1-1|2160p2500] Failed to schedule primary video.
[2026-02-28 22:38:09.903] [info]    UltraStudio 4K Mini [1-1|2160p2500] Initialized.
[2026-02-28 22:38:09.903] [info]    Initialized startup producers.
[2026-02-28 22:38:09.904] [info]    Initialized controllers.
[2026-02-28 22:38:09.904] [info]    Initialized osc.

For the Ultrastudio to initialize I need to set it to 709

 <channels>
    <channel>
	<color-depth>16</color-depth>
		 <color-space>bt709</color-space>
      <video-mode>2160p2500</video-mode>
      <consumers>
        <decklink>
          <device>1</device>
          <embedded-audio>true</embedded-audio>
          <buffer-depth>4</buffer-depth>
        </decklink>
      </consumers>
    </channel>
  </channels>