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Blackmagic Decklink Quad HDMI Recorder give massive delay after adding more than 2 source
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khmerbrave  
#1 Posted : Monday, November 20, 2023 9:20:21 PM(UTC)
khmerbrave

Rank: Newbie

Groups: Registered
Joined: 11/20/2023(UTC)
Posts: 1
Cambodja
Location: Phnom Penh
I have been using this Quad HDMI Recorder card on our original PC setup for few years and we didnt have problem with delay at all until recently we got some profit and we bought new PC which is more powerful and wanna make it into main broadcast PC so we take the card from OLD PC to plug in NEW PC. When it all work fine and received feed as normal until we start adding more than 1 Source in Vmix from the same card it give us at least 2sc delay from the feed. Here our Example:

*OLD PC:
-Slot 1 : PC HDMI
-Slot 2 : PC HDMI
-Slot 3 : Camera HDMI
-Slot 4 : PC HDMI

Spec :
RAM : 32GB
GPU : RTX 3060
CPU : Core i7-11700K
MOBO : TUF GAMING Z590-PLUS WIFI

*New PC:
-Slot 1 : PC HDMI
-Slot 2 : PC HDMI
Just this 2 already give the delay.

Spec:
RAM : 32GB
GPU : RTX 3080
CPU : Core i7-12700KF
MOBO : B660 GAMING X DDR 4

I wanna mention that all the cable and PC are all the same we been using it for years just this new PC that start giving problem.
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dmwkr  
#2 Posted : Monday, November 20, 2023 9:34:22 PM(UTC)
dmwkr

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Joined: 2/23/2019(UTC)
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Watch Tim's Video on PCIE slots, especially the chapters about slots and lanes:


And then check the expansion slot specs of your board:
https://www.gigabyte.com...G-X-AX-DDR4-rev-10/sp#sp

It says, the 2nd and 3rd PCIE slots are only running at x1 speed, so, unfortunately, they are too slow for the capture card.
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