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Audio but no Video for vMix stream all of a sudden
Rank: Newbie
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Joined: 9/29/2025(UTC) Posts: 1 
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I've help stream my church's service to Facebook and Youtube for a while now though I'm not the biggest computer expert.
We have 2 cameras in the sanctuary and use EasyWorship on a 2nd laptop for 3 inputs total into a BlackMagic ATEM Mini Extreme. From the ATEM the video outputs via HDMI to a splitter that displays the stream on TVs around the church as well as outputs via USB C to the USB port on another laptop we stream from with vMix. Video shows up fine on the TVs around the sanctuary, but in vMix when I add BlackMagic Design as a camera input in vMix I'm getting audio but no corresponding video is being displayed, only a black screen. This hasn't happened before and I have no idea what caused it or how to fix it even just a few days ago this wasn't a problem.
Also on a side note when the above wasn't a problem, if vMix is showing a high render time at times that would probably indicate the GPU is suffering right? Because the laptop doesn't have a dedicated GPU only Intel HD Graphics and when it's showing high render times the video quality starts to stutter and frames begin drop when lots of movement/audio are present
Thank you,
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Rank: Newbie
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Joined: 10/6/2025(UTC) Posts: 1 Location: NY
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You could try checking if the ATEM Mini’s USB output is still recognized as a webcam device in Windows. Sometimes updating or reinstalling the Blackmagic drivers helps when vMix detects audio but not video. Also, make sure the output format in ATEM matches what vMix expects (for example 1080p60). About the render time issue, yes, that usually means your integrated GPU is struggling. Lowering output resolution or frame rate in vMix should help stabilize the stream.
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Rank: Advanced Member
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Joined: 10/20/2023(UTC) Posts: 91  Thanks: 2 times
Was thanked: 6 time(s) in 6 post(s)
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You should use an external encoder instead of the PC Vmix
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Rank: Advanced Member
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Joined: 2/9/2021(UTC) Posts: 30  Location: Oslo Thanks: 2 times
Was thanked: 1 time(s) in 1 post(s)
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We've had issues with the Desktop Video driver for Decklink cards for a while. I don't know if you need that if you're using it as a webcam input, but if you do, do take the time to check if it's configured correctly. For us the problem has been that is has dropped the configuration on the incoming connector between computer restarts.
Dropped frames can be bottlenecked by either the CPU or the GPU. You should check the performance tab in Task Manager while vMix is active to see where your bottleneck is. The Statistics tool in vMix will give more detail. Renderer Dropped is due to the GPU. Source Dropped is due to the camera or capture card. Resync is because the camera/source is not running at the same clock speed as vMix.
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Audio but no Video for vMix stream all of a sudden
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