We are experiencing an issue with the DeckLink output in our Aximmetry Multi-Machine setup and would appreciate your assistance.

Software Versions

• Aximmetry: 2026.4.0
• Blackmagic Design Desktop Video: 15.3.1

System Configuration

Machine 1 – Control & Composition

• Video Input: 3840 × 2160p59.94
• Video Output: TV (Final Composition)

Machine 2 – LED Rendering

• DP Output: 1920 × 1260 (LED 1)
• HDMI Output: 1280 × 1260 (LED 2)
• HDMI Output: 1280 × 1260 (LED 3)

Both machines are equipped with Blackmagic Design DeckLink 8K Pro cards.

Current Status

XR and Digital Extension compositing using the LED walls are both working correctly.

However, when we attempt to output the final composited video through the DeckLink card, only the clean camera feed is displayed instead of the final composited image.

We have confirmed the following:

1. The DeckLink output is correctly assigned in Aximmetry's IN/OUT settings.
2. The output thumbnail in the IN/OUT settings appears black.
3. Occasionally, the composited output works correctly after restarting the PC.
4. In most cases, however, the DeckLink output continues to display only the clean camera feed rather than the final composited image.

Questions

1. What could cause the DeckLink output to display only the clean camera feed, even though XR and Digital Extension compositing are working correctly?
2. Are there any specific settings we should check in Aximmetry's Multi-Machine configuration, Flow Editor, or IN/OUT settings?
3. Could this issue be related to Blackmagic Desktop Video 15.3.1 compatibility with Aximmetry 2026.4.0?
4. Since the issue occasionally disappears after restarting the PC, could it be related to DeckLink initialization, device allocation, or startup sequence?
5. Are there any recommended troubleshooting procedures or known workarounds for this issue?

We would appreciate your guidance on how to identify the root cause and resolve this issue.