Family, I am really struggling here and Black Magic Design is not being helpful.
On CoentOS 9.5, the Autodesk version, current DKU, 2026.2.2, and 15.3.1 of the BMD driver, I am getting audio popping and clicking on all audio playback. No matter where the media lives or what type it is. Playing from my NVMe Raid or Synology. I get occasional audio dropouts as well. Doesn’t happen when I send audio over NDI or HPA with ALSA. It is just on any output of the BMD card. I have put in a service case with BMD, but they said they really don’t have a tech support for Linux operations, only Windows and Mac.
I have forced the pulse audio to 48000 and that didn’t help.
I pretty much can’t play back any audio in the studio without popping and clicking. I guess I could purchase another AJA card and try that, but that is another 4k. So, if this would work it would be great.
Lenovo P620 with latest Bios and all.
Note: if I boot into Windows, the playback is clean. No issues form Windows on the same card in the same machine.
I just moved the Blackwell, NVMe card and the BMD around to different slots to see if it made any difference, and same result. It is interesting that I am now noticing what would amount to dropping frames, but in audio. Video is playing black clean with no dropped frames. In 4K and HD clean video.
I did some extensive testing and sent the results to BMD. See below. Seems it is a driver issue with Linux 9.5.
Update on testing the Decklink 4k Extreme 12G card in Linux.
I have tried all the drivers from 14.4.1 to 15.3.1. This makes no difference. I still get a clicking and popping while any audio is playing out of any output of the card. SDI, HDMI, Analog, and AES. Tried them all. This happens from any program. Resolve, Flame, the OS player, and Media Express. It is random and can happen instantly when you start playing sound or after a second or two. It behaves like a short in an analog cable or a discharge of static buildup.
I have tried the card in slot 1, 3 and 5 in my Lenovo P620. I also made sure I have the latest Bios and such.
Note: the video plays fine from HD to 2160P. No issue with video or dropping video frames. The audio files are playing back from an internal NVMe raid or a 10gigE connected Synology NAS.
Additional Interesting note: This machine is dual boot. If I boot it into windows, I do not get the same behavior. It just works correctly. In Resolve and Premiere.
I am on CentOS 9.5.
Please advise. I have an AJA Kona 4G and it works fine. It has a defective fan, so I can’t run it long. But enough to verify it is down to the card and the driver for Linux.
I do have an older 4K Extreme and put it in to test with. I have the same results; therefore, it seems to be the Black Magic Design driver for Linux causing the issue. I do not have the issue with the cards in Windows on the exact same machine.
Any help would be appreciated, or I just have a useless BMD device and will have to purchase a new AJA card to replace it.
i am sorry just following to see if you can solve it
15.3.1 is the certified driver for flame systems and you are on a certified system , id say open a case with adsk as well, as they have verified this config to be working, and are saying this is all a blessed config, maybe its as stupid as some bios switch.
I have an old AJA 3G with a working fan in a box - I think I gave away the cables and breakout, but you could probably do some organ harvesting.
I have an old AJA 4G in an old HP z820. (both fully functional)
Ping me - you have my details.
The fact that it runs on Windows is useful, but not especially helpful. It means the hardware is fine, but that you likely have a configuration / driver issue.
Two areas that can cause these cracklinks - a small buffer size. If the system gets busy and there’s a delay sending the card the next batch of audio data, you get a pop. Not sure if you can configure the buffer size? It usually a critical parameter on audio interfaces.
The other one would be a mismatch in sample rates somewhere. Driver set to 41kHz and Flame trying to play back at 48kHz. In theory this shouldn’t matter and Flame should override this. But you’re double checking all the boxes.
My money would be on the Linux config using a small buffer and the system I/O is heavy at the time.
The alternative it buy a small USB audio inferface and use that. I think Flame can use different interfaces for video and audio now, doesn’t it?
In general if you want good audio, a dedicated audio interface always seems better than whatever the video I/O cards offer. But not all software can drive separate interfaces.
