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Decklink Duo 2 dropping frames??
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Joined: 10/8/2021(UTC) Posts: 1 
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On vMix 24 got capture problem. If I adding more then 2 inputs via Decklink Duo 2 framerate is falling form 50 to smthing like 15-25 Render time is about 6 ms, GPU Mem: 21%, CPU vMix 7%, Total 12%, so system load is not too high input 1 - Notebook 1920x1080@50p input 3 - Notebook 1920x1080@50p input 2 - Camera - Sony PXW-Z150 1920x1080@50p or 1920x1080@50i input 4 - Camera - Sony PXW-Z150 1920x1080@50p or 1920x1080@50i operating system - Windows 10 omegle xendermotherboard - B460 AORUS PRO AC processor - Intel(R) Core(TM) i7-10700 CPU graphic card - NVIDIA GeForce RTX 2070 SUPER RAM - 32 Gb attempts to solve the problem: in BIOS Above 4G Decoding is enabled changed Desktop Video from 12 to 11.7 reinstall and update vMix changed camera output from 1920x1080@50p to 1920x1080@50i
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Rank: Advanced Member
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Joined: 5/13/2014(UTC) Posts: 518   Location: Manchester, UK Thanks: 2 times
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Sounds like it might be in a PCIe slot which doesn't have four full lanes of PCIe bandwidth assigned to it, hence dropping frames when more than 2 inputs are used. Check in the BIOS how the PCIe slots are configured. With desktop CPUs & motherboards you're almost always limited when it comes to PCIe lanes, and you should never assume that just because you've got a PCIe slot (with the physical dimensions of a 4x or 16x slot) that it will have all those lanes active. In some cases you might have a 16x slot but only working as a 1x slot, or it could be that a particular PCIe slot shares it's bandwidth with some other interface like a M.2 slot.
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Rank: Advanced Member
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Joined: 11/11/2016(UTC) Posts: 378 Location: Europe Thanks: 23 times
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Board Spec:
1 x PCI Express x16 slot, running at x16 (PCIEX16)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
1 x PCI Express x16 slot, running at x4 (PCIEX4)
* The PCIEX4 slot shares bandwidth with the M2P_SB connector. The PCIEX4 slot operates at up to x2 mode when a PCIe SSD is installed in the M2P_SB connector.
3 x PCI Express x1 slots
(All of the PCI Express slots conform to PCI Express 3.0 standard.)
but for the Decklink Duo, you need x8 and only have x4
you have to change the MB
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Rank: Advanced Member
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Joined: 5/13/2014(UTC) Posts: 518 Location: Manchester, UK Thanks: 2 times
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Originally Posted by: xaver  Board Spec:
1 x PCI Express x16 slot, running at x4 (PCIEX4)
* The PCIEX4 slot shares bandwidth with the M2P_SB connector. The PCIEX4 slot operates at up to x2 mode when a PCIe SSD is installed in the M2P_SB connector.
but for the Decklink Duo, you need x8 and only have x4
you have to change the MB Actually the Decklink Duo 2 only needs 4 PCIe lanes, not 8, but the description of the issue implies that it's only getting 2 (hence the card works fine with just 2 inputs, each using one lane, but drops frames when more inputs are used). So it looks like something may be installed on the M2P_SB connector which is therefore reducing the capacity of the PCIEX4 slot down to having just 2 lanes available, as per Xaver's post.
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Rank: Advanced Member
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Joined: 2/20/2019(UTC) Posts: 63  Location: Firenze Was thanked: 5 time(s) in 5 post(s)
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Intel I7 10700 processor has a total of 16 PCI lanes. If you have assigned 16 lanes to the graphic card and 4 to Decklink you are already above that number, then you have to add storage and network card , and it seems you are using NDI from other notebooks, if i'm not wrong.
I would drop the graphic card slot to x8.
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