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Black Magic Duo 2 Audio Delay

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Black Magic Duo 2 Audio Delay

Postby avd » Tue Jan 22, 2019 7:39 am

Hi all,

Having issues with audio delay in TD from BMD Decklink Duo 2 card.
Sync from the Audio Device In Chop is a long way behind the video, about 4 tenths of second behind.
I have tested the card setup with other programs on the computer, BMD Media Express is fine, Vmix is fine.

Searching the forum doesn't get that many hits on audio sync issues with this setup. So either not many people are using the BMD cards, or not many people are having sync issues. (or my search skills are way off)

I have tried changing the buffer length, but this creates a choppier output.
Tried changing the format and rate settings in the aDI chop.
Tried changing the FPS of the project to match the video FPS.

I have a work around, bringing the audio in separately to the video via an audio interface. But this is not ideal, as it will also cause sync issues.

Any help or suggestions much appreciated.

Setup is:
TD ver - 2018.27550 and have tried 2019.10700
Windows 10 ver 1803 (os build 17134.556)
Alienware 15 R4 - Intel i9-8950HK, Ram 16GB - GeForce GTX 1080 Max-Q
Desktop Video ver 10.11.4
BMD Decklink Duo 2 - hd-sdi 4 way card
avd
 
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Re: Black Magic Duo 2 Audio Delay

Postby ben » Fri Jan 25, 2019 9:57 am

Hi avd, I moved this to the bugs forum. Let me find a card here for testing.
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Re: Black Magic Duo 2 Audio Delay

Postby avd » Mon Jan 28, 2019 3:14 pm

Hi Ben
Thanks very much. I will be very interested to hear how you get on.
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Re: Black Magic Duo 2 Audio Delay

Postby malcolm » Mon Feb 25, 2019 1:42 pm

Sorry for the delay in answering. Right now this is a missing feature. We need to add support for the direct audio capture using Blackmagic's SDK, which will allow the streams of data to be in sync.
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Re: Black Magic Duo 2 Audio Delay

Postby avd » Wed Feb 27, 2019 7:26 pm

Hi Malcolm
Thanks for the reply.
Any estimate on how long it will take for the feature to be added?
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Re: Black Magic Duo 2 Audio Delay

Postby avd » Wed Jun 26, 2019 4:21 am

malcolm wrote:We need to add support for the direct audio capture using Blackmagic's SDK


Just wondering on the timeline for adding this feature?
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Re: Black Magic Duo 2 Audio Delay

Postby ben » Thu Jul 11, 2019 6:19 pm

Unfortunately we do not have it scheduled for development immediately so we can't give an ETA right now. One option is Pro Support hours if that works for your project's budget, you can contact us for an estimate in time it would take.
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