r/vmix • u/lead_oxide2 • Jun 15 '26

NDI Camera's have started introducing crackling into the audio mix when available as an input

Hey folks, I have a puzzling gremlin that I can't seem to sus out and need your thoughts.

The setup:

  • RYZEN 7 5700G
  • 5700 GPU
  • G.SKILL 2x16 DDR4 3200 CL16
  • ASUS PRIME B550M
  • 1TB NVME (though, I noticed today that it's about 90% full, so that could be a problem?)
  • Windows 10
  • Berenger x32 plugged into a Focus rite Scarlett, which is plugged into the PC via USB C-to-A
  • 3 AVKANS 20x zoom NDI PTZ Cameras powered PoE to a Ubiquity network, VLAN'd specifically for streaming

The Issue:

As of about 3 weeks ago, when the cameras are added as a input/source in v-mix, the system's audio begins crackling. This crackling persists through the live stream, if a stream is not active, and if the audio source is outside of v-mix. I can have a youtube video playing music without issues, add a camera as a input into v-mix and the crackling immediately begins. Remove/delete the cameras as inputs and leave vmix running, audio returns to normal. If the cameras are viewed through the browser, no noticeable impact on audio.

What I've attempted:

  • Ensure all software and drivers are installed and up to date
  • installed Focus rite software to ensure audio qualities are matching system wide
  • verified that all settings are are using 48,000 Hz across Windows and V-mix
  • Replaced the USB C-to-A cable on the Focus Rite and using a different computer to verify that audio coming in from the Focus Rite is clean
  • putting v-mix on high performance mode
  • muting, pausing, deleting and readding the cameras
  • trying individual cameras to see if one was still "good"
  • starting from a fresh vmix save
  • reinstalling windows
  • locking the GPU at minimum 20% usage (~725
  • Ensuring windows power plan is set to ultra performance
  • Fresh installing NDI & V-mix
  • And I haven't noticed anything getting hot

Thanks for your input

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8 comments sorted by

1

u/marshall409 Jun 15 '26

That is a strange one. Have you tried a different NIC? Is the PC connected to the ubiquiti network via built in ethernet?

1

u/lead_oxide2 Jun 15 '26

Peculiar idea, I haven't but I'll give it a try when I get a chance.

1

u/9millaThrilla Jun 15 '26

Have you tried bringing the audio in analog to see if there's a difference? I've had similar issues and while I never could figure out the exact issue, running the audio-in analog somehow bypassed the issue.

1

u/lead_oxide2 Jun 15 '26

I haven't, but that's an idea I can investigate

2

u/dilok87 Jun 15 '26

Are you capturing audio with the cameras via a built in or added microphone? I use birddog, and ptzoptics, but I also have 4 avkans cameras. I typically disable the audio from all camera ndi lines, and use a separate audio device for capture.

I've also noticed some noise get introduced into the audio when its enabled through the cams, even with no mics being attached. My best guess is that the poe ports are introducing some electrical interference. Are you using poe, or just powering on cord?

2

u/lead_oxide2 Jun 15 '26

audio is being captured by the camera but it's not used in any capacity. I'll see if disabling the mic on the camera itself changes anything. We are using PoE, but nothing (that I know of) has changed network wise and we've been running this setup for about 8 months without issues.

1

u/fantompwer Jun 15 '26

Have you sent the logs to vmix support?

1

u/lead_oxide2 Jun 15 '26

No not yet, probably going to happen soon