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vMix Capture Card Low Frame Rate
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At a recent broadcast on vMix 28.0.0.39, any camera inputs in vMix using my Blackmagic DeckLink Quad 2 8-Channel, were suffering from a very low framerate. If I had to estimate, vMix was dropping about 50% of the frames.
If I accessed the camera inputs using Blackmagic's native software in Windows, the cameras on the Quad 2 card appeared normal, telling me it was a vMix issue.
No amount of restarting vMix, trying a default profile, resetting the inputs, or even restarting Windows fixed the dropped frames in vMix.
Camera input on my separate Blackmagic Declink 4K Mini were perfectly normal inside vMix.
vMix had been working fine with this setup for several months without issue.
Fortunately during a pause in the broadcast I was able to, as a last resort, close vMix, update my nVidia drivers and reboot the computer. Everything then started working normally and was fine from thereout. I don't see why a nVidia driver update would have fixed things though?
My question is - what would have caused this to randomly occur and how can I prevent this from happening again?
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Rank: Newbie
Groups: Registered
Joined: 7/17/2023(UTC) Posts: 1  Location: D.C
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Good morning John! I'm having the same exact issue with my Atem Mini Pro. Thank you for bringing out this reoccurring issue!
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Rank: Staff
Groups: Registered, Moderator Joined: 2/13/2023(UTC) Posts: 8  Location: Queensland
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Originally Posted by: JohnDoe415  At a recent broadcast on vMix 28.0.0.39, any camera inputs in vMix using my Blackmagic DeckLink Quad 2 8-Channel, were suffering from a very low framerate. If I had to estimate, vMix was dropping about 50% of the frames.
If I accessed the camera inputs using Blackmagic's native software in Windows, the cameras on the Quad 2 card appeared normal, telling me it was a vMix issue.
No amount of restarting vMix, trying a default profile, resetting the inputs, or even restarting Windows fixed the dropped frames in vMix.
Camera inputs on my separate Blackmagic Declink 8K Extreme were perfectly normal inside vMix.
vMix had been working fine with this setup for several months without issue.
Fortunately during a pause in the broadcast I was able to, as a last resort, close vMix, update my nVidia drivers and reboot the computer. Everything then started working normally and was fine from thereout. I don't see why a nVidia driver update would have fixed things though?
My question is - what would have caused this to randomly occur and how can I prevent this from happening again? Hi John, Depending on the workflow and system, it sounds like there may have been performance issues with your system at the time however, we could not confirm this without more information. If you do see the issue occur again, please reach out to our contact form below: https://www.vmix.com/contact-us.aspx
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Rank: Staff
Groups: Registered, Moderator Joined: 2/13/2023(UTC) Posts: 8 Location: Queensland
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Rank: Member
Groups: Registered
Joined: 1/12/2025(UTC)
Posts: 11
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Originally Posted by: Ben-vMix Hi John, Depending on the workflow and system, it sounds like there may have been performance issues with your system at the time however, we could not confirm this without more information. If you do see the issue occur again, please reach out to our contact form below: https://www.vmix.com/contact-us.aspx I have just had this problem occur again, so will reach out to the support channel above.
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Rank: Member
Groups: Registered
Joined: 1/12/2025(UTC)
Posts: 11
Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
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Originally Posted by: Ben-vMix Originally Posted by: JohnDoe415 At a recent broadcast on vMix 28.0.0.39, any camera inputs in vMix using my Blackmagic DeckLink Quad 2 8-Channel, were suffering from a very low framerate. If I had to estimate, vMix was dropping about 50% of the frames.
If I accessed the camera inputs using Blackmagic's native software in Windows, the cameras on the Quad 2 card appeared normal, telling me it was a vMix issue.
No amount of restarting vMix, trying a default profile, resetting the inputs, or even restarting Windows fixed the dropped frames in vMix.
Camera inputs on my separate Blackmagic Declink 8K Extreme were perfectly normal inside vMix.
vMix had been working fine with this setup for several months without issue.
Fortunately during a pause in the broadcast I was able to, as a last resort, close vMix, update my nVidia drivers and reboot the computer. Everything then started working normally and was fine from thereout. I don't see why a nVidia driver update would have fixed things though?
My question is - what would have caused this to randomly occur and how can I prevent this from happening again? Hi John, Depending on the workflow and system, it sounds like there may have been performance issues with your system at the time however, we could not confirm this without more information. If you do see the issue occur again, please reach out to our contact form below: https://www.vmix.com/contact-us.aspx Hello, I am wanting to make sure my support email was received? I had to email your support email address rather than use the form, as I had to attach some files. What is the usual response time for support? I only ask as I have upcoming broadcasts I need to get this fixed for. Thank you
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Rank: Administration
Groups: Administrators
Joined: 1/13/2010(UTC) Posts: 5,212  Location: Gold Coast, Australia Was thanked: 4485 time(s) in 1564 post(s)
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Hi,
We have searched our email provider and unfortunately nothing shows up for your address.
Please double check with your email provider, or alternatively use the support form and wait for our reply before sending attachments.
Regards,
Martin
vMix
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Rank: Member
Groups: Registered
Joined: 1/12/2025(UTC)
Posts: 11
Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
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Originally Posted by: admin Hi,
We have searched our email provider and unfortunately nothing shows up for your address.
Please double check with your email provider, or alternatively use the support form and wait for our reply before sending attachments.
Regards,
Martin
vMix I will re-submit now, thank you for the response.
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