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bartek  
#1 Posted : Friday, January 26, 2018 8:29:27 AM(UTC)
bartek

Rank: Newbie

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Joined: 2/7/2015(UTC)
Posts: 7

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Hi!
I have a latency problem on the Black Magic Declink Quad 2 card.
I test latency on input and output of the cards. The test procedure is as follows:
Thinkpad laptop as a source with animation for testing -> HDMI to SDI converter -> to the second computer with black magic capture card.

in the second computer I go to the Vmix and BM card.
On Vmix I have two outputs - directly from GTX1080 and the second monitor is via SDI (external output) from the card

1) the input delay is equal to 100 ms.
2) image from GTX is at the same time as in Vmix
3) the image on the Declink output is also delayed by 100ms relative to Vmix
4) if I wanted to input the signal from the camera to decklink and output from vmix by decklink via SDI is around 200ms
in the attachment a photo of the tests.

I's look like decklink buffered data on input and output by 100ms. Can I reduce it?
before the question is asked - I have the low latancy mode enabled ;-)

UserPostedImage
spencerm24  
#2 Posted : Friday, January 26, 2018 12:03:53 PM(UTC)
spencerm24

Rank: Advanced Member

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Joined: 9/23/2017(UTC)
Posts: 249
Location: Toronto

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Was thanked: 19 time(s) in 17 post(s)
bartek wrote:
Hi!
I have a latency problem on the Black Magic Declink Quad 2 card.
I test latency on input and output of the cards. The test procedure is as follows:
Thinkpad laptop as a source with animation for testing -> HDMI to SDI converter -> to the second computer with black magic capture card.

in the second computer I go to the Vmix and BM card.
On Vmix I have two outputs - directly from GTX1080 and the second monitor is via SDI (external output) from the card

1) the input delay is equal to 100 ms.
2) image from GTX is at the same time as in Vmix
3) the image on the Declink output is also delayed by 100ms relative to Vmix
4) if I wanted to input the signal from the camera to decklink and output from vmix by decklink via SDI is around 200ms
in the attachment a photo of the tests.

I's look like decklink buffered data on input and output by 100ms. Can I reduce it?
before the question is asked - I have the low latancy mode enabled ;-)

UserPostedImage


There is going to be some latency on this, 200ms isn't abnormal for the amount of processing it is going through.
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