Decklink Consumer: Audio disappears after some time (buffered-audio graph goes to zero) about help HOT 9 OPEN

Just a first thought, have you tried Trilevel sync, later decklink drivers require that type of sync to work in HD.

/Olle

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Thanks for your reply Olle.

No, i have not tried Trilevel sync, yet. I just wanted to have an expert response first, since the sync type requires some effort on our side and could cause issues with other existing channels.
This is exactly the reason that i tested 10.8.3 Decklink driver, which is said to have a stable behavior with Black-Burst sync type.
In any case, thanks for sharing this information. I didn't know that (latest) decklink drivers require Trilevel sync type in order to work in HD.
Is there any possibility that Trilevel genlock type switch, will cause any issues on our existing PAL channels?

Thanks,
Lefteris

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Hi

As i said, this’s what first popped up in my head. I am not sure regarding implications regarding PAL. Sorry

/o

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It's ok. In any case, i have got something new to try!
I will do some further research on GenLock Types and have a try in our test environment.
Will let you know about the results.

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@leftearsons did you find a solution to this problem?

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Hi @Phillipjacob.
I managed to find a workaround to bypass the problem, but I don't think it can be considered as a proper solution.

Unfortunately due to some technical limitations in our setup, we did not have the chance to test the trilevel sync that @5opr4ni proposed. The PAL genlock is still being used.
What I am doing instead, is to periodically reload the SDI consumers (every 30 minutes for 1080 outputs and every 60 minutes for 720 outputs), which by the way does not create any flickering on the channel output, making it invisible.

Hope this helps!

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Hi @Phillipjacob.
I managed to find a workaround to bypass the problem, but I don't think it can be considered as a proper solution.

Unfortunately due to some technical limitations in our setup, we did not have the chance to test the trilevel sync that @5opr4ni proposed. The PAL genlock is still being used.
What I am doing instead, is to periodically reload the SDI consumers (every 30 minutes for 1080 outputs and every 60 minutes for 720 outputs), which by the way does not create any flickering on the channel output, making it invisible.

Hope this helps!

Hey @leftearsons Okay thanks. We'll test Tri-level by the end of summer. Then I'll let you know the result.
How do you reload the SDI consumers automatic?

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Hi @Phillipjacob. Thanks for the update. Will look forward for your Tri-level results.

The SDI consumers "reloading" is being done by simple re-adding any existing Decklink consumer on the channel.
I am using CasparCG v2.07 (have not tested on later versions though), which by re-adding the same consumer, simply resets it's state without affecting the output content (flickering etc).

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I am running into the same issue after increasing my setup from 2 to 3 channels all running in 1080P2500. After a few days, the audio seems to drop out and I am also seeing the same flatline on the buffered audio after the audio is gone.

I ran into this issue CasparCG/server#1312 which points to either sync issue when using an internal keyer or performance issues causing the audio buffer to underflow and never recover. No solution yet but it seems that increasing the specs might fix the issue.

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