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#1 Posted : Monday, November 1, 2021 11:02:18 PM(UTC)

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Joined: 1/16/2021(UTC)
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Location: Eching


I'm currently facing an issue I can't explain. I'm ingesting HD-SDI (720p59.9) with embedded Audio using a BM Decklink Duo 2 into vMix (720p59.9 project) . The audio is perfectly in sync with the video (mixing console video out is delayed to compensate). I can verify this with a BM Hyperdeck which is recording the incoming signal (both devices are connected to a SDI Matrix).

Even without any processing on the vMix (SDI Input to PGM; PGM to the second Decklink channel) I see an Audio Delay in the output SDI (2.5-3 frames).

So basically a perfectly locked/synced SDI signal comes in ... but an SDI signal with audio delay leaves the machine.

Any idea how to fix this?

In other posts I read about negative audio delay (e.g. vMix adds audio delay by default to compensate for delayed video). In my case however this is not neccessary and I have no idea how to fix this. Even the "negative Audio delay" mentioned in some posts does not change anything here (does it work at all? E.g. compensating the default delay that vMix add?).

Any hints/help appreciated.


#2 Posted : Wednesday, November 24, 2021 8:11:39 PM(UTC)

Rank: Newbie

Groups: Registered
Joined: 11/24/2021(UTC)
Posts: 1

i have the same problem with a Decklink 2 duo
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