Caspar won't play sound after some times

General
1

Hello,

We have a CasparCG server running for about 3 years 24/24h without troubles. Of course we reboot the whole Windows regularly (about once a month)
We are running with Decklink duo, on a Windows 10 pro (HP workstation from 2023), Intel core xeon W-2223 3,6Ghtz, 64Go RAM and GeForce 1080 Ti. Media files are located on a SMB volume and commands are sent by Companion. And we’re mostly playing Sony MXF XDCAM interlaced 50mbits files and html templates.
By now, we didn’t experienced any issues with the 2.4.2 version

But, during last weeks, we experienced some strange issues. We produced a show on evening and on the next morning, there were no sound outputing on SDI. Relaunched the server and it worked fine again. My colleague told me, there was also a kind of lag during playing a clip last week.

I tried to update our decklinck to last firmware, and using the 2.4.3 stable version, without success.

My last option is to format the PC and starting from scratch.

Before this, is there anybody, who experienced a similar issue ?

2

I have seen this on some driver builds.

I’m currently running CasparCG 2.4.3 and Decklink 12.4.2 and it seems stable.

3

Hi, how are you?

I’m experiencing the same issue now. After eight months of working perfectly, it suddenly started losing audio.

My setup runs on Linux, but the issue is the same. I’m using CasparCG 2.4.3 and Desktop Video 15.

Did you manage to identify the cause?
How did you resolve your issue?

Any advice would be greatly appreciated.

Thank you!

4

What sort of logs do you see if you run it with debug or trace logs?

5

Hi @zcybercomputing

There is nothing unusual in the CasparCG logs—no loss of reference or anything else that might explain the issue.

My setup is Ubuntu 22.04, Blackmagic Desktop Video driver 15.0, and CasparCG 2.4.3.

The strange thing is that, when the issue occurs, the audio graph in CasparCG’s DIAG window still shows activity. However, I connected a monitor directly to the machine’s SDI output to test it, and confirmed that there was no audio output.

After terminating CasparCG with the kill command and restarting it, the audio works normally again. However, the problem returns after a few days.

Which Blackmagic Desktop Video driver version would you recommend on Linux for CasparCG 2.4.3? Would you also recommend switching to a different CasparCG version?

For context, this machine ran for approximately eight months without ever experiencing this issue.

Thank you for your quick response. Any advice would be greatly appreciated.