GStreamer not detecting signal from DeckLink Mini Recorder 4

Hardware: DeckLink Mini Recorder 4K

Operating System: Ubuntu 24.04 LTS (Kernel 6.11)

Driver Version: Desktop Video 14.4

Problem Description: Media Express works correctly, but no third-party applications can detect a signal. Both GStreamer and the official C++ SDK Capture sample fail, reporting "No input signal detected". Looks like the issue is with the driver's public API.

Please help

mypc:~/Downloads/Blackmagic_DeckLink_SDK_14.4/Blackmagic DeckLink SDK 14.4/Linux/Samples/Capture$ sudo ./Capture -d 0 -m 4
Capturing with the following configuration:
- Capture device: DeckLink Mini Recorder 4K
- Video mode: 1080p25
- Pixel format: 8 bit YUV (4:2:2)
- Audio channels: 2
- Audio sample depth: 16 bit
Frame received (#0) - No input signal detected
Frame received (#1) - No input signal detected
Frame received (#2) - No input signal detected
Frame received (#3) - No input signal detected

[Cameron Nichols]

Hi Abhishek,

I would double check the following:

• Ensure that you have correctly configured the input connector (SDI/HDMI) in Desktop Video Setup, or with the DeviceConfigure SDK sample
• Check whether auto-mode detection is able to capture, provide -m -1 as option to enable this feature, instead of explicitly specifying the mode.
• Check whether the DeckLink is locked to the input and that there is consistency between the detected input signal and the enabled input. You should run the StatusMonitor sample alongside Capture

Regards
Cameron