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Harty  
#1 Posted : Saturday, March 18, 2017 2:31:06 PM(UTC)
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Hi fellow vMixers...

Yesterday I had to do a livestream of a concert for a band and picture wise everything was perfect. But we had huge problems with the audio output via a Blackmagic Design Deckling Quad 2 Card. It had kind of a "Slapback Delay" (it´s a guitarist term, hope anybody here knows what I mean - if not: it´s kind of a very short delay of the main signal right after the main signal.

BUT: I checked everything a couple times. There was just the one input from the soundguy, brought into vMix via an "Audio Input". All other audio (from the cams, clips etc.) was turned of. I did´t just turn it of, I even pulled down all the faders and unticked the M, A and B buttons.

I checked my settings today again (saved the file from yesterday) and I´m absolutely sure, it was not a failure regarding the inputs. When I checked my sound via the headphones, everything was fine, but after the sdi output I had the "double delay".

Anybody experienced this with BM cards? Or knows any other reasons for my problem?

(By the way, I´m a sound guy also, so I know how to route stuff etc., so I really checked everything on the input side)

Thanks for your help!!!

Greetings, Thomas
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DWAM  
#2 Posted : Saturday, March 18, 2017 2:57:04 PM(UTC)
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Hi Thomas

just to make it clear, the issue is not an audio input issue, it's not even an issue when streaming or recording (which I understood are ok), it's only appearing when you render the live production or the recorded material thru your BMD Decklink Quad 2 SDI out, right?

If you try another recording (than last night's), do you notice the same issue?
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Harty on 3/18/2017(UTC)
Harty  
#3 Posted : Saturday, March 18, 2017 3:50:24 PM(UTC)
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You got it exactly right DWAM. It just appeared when using the BM Out.
On all other things (stream, record) I didn´t have the issue...
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DWAM  
#4 Posted : Saturday, March 18, 2017 4:21:24 PM(UTC)
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It makes me feel like you had your BMD card set as Default Audio Device in Windows at the same time vMix used it for External.
I don't have Quad 2, only Duo 2 but I noticed Windows might change Default Audio Device setting sometimes and it may result in BMD card being set as new Default.

Just a guess...
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Harty on 3/18/2017(UTC)
Harty  
#5 Posted : Saturday, March 18, 2017 4:34:19 PM(UTC)
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Thanks DWAM - Sounds like a starting point to me... I´ll check after the weekend!!
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stevespaw  
#6 Posted : Sunday, March 19, 2017 5:51:17 PM(UTC)
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We have this issue on all of our systems.

As weird as it may sound, on your external settings, instead of what you would think, in video device select BMD card,

-in audio device select "NONE". -

I get calls on this every few weeks.

Steve
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Harty on 3/19/2017(UTC), SHMD on 3/22/2017(UTC)
Harty  
#7 Posted : Thursday, March 23, 2017 7:45:47 AM(UTC)
Harty

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It was exactly as you mentioned. I switched the "Master Output" away from the Decklink and now everything is perfect... Well, I don´t get it routing wise, but I´m fine with knowing how to solve the problem :-)

Cheers and thanks everybody,

Thomas
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