Dropouts when recording through VB-Cable

VB-Cable A & B, HIFI-Cable, ASIO Bridge
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jacobacci
Posts: 9
Joined: Sat Feb 20, 2021 7:04 pm

Dropouts when recording through VB-Cable

Post by jacobacci »

After solving my initial issue of misconfiguring Audacity, I am happily recording from Roon through VB Cable to Audacity.
When I looked at the recorded files in Audacity, I noticed that there are dropouts of around 0.1 second length at irregular intervals during the recording. They are not very frequent, but frequent enough to be annoying. During the dropout the signal seems to be a perfect zero. The db scale of the Audacity display shows no amplitude at all.
This is what such a dropout looks like:

Audacity2.jpg
Audacity2.jpg (243.16 KiB) Viewed 2822 times

I get these dropouts under Windows 10 and also under MacOS BigSur 11.2.3 During recording no other tasks are preformed on the computer.
I would appreciate any suggestions what might be the issue here.
Vincent Burel
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Joined: Sun Jan 17, 2010 12:01 pm

Re: Dropouts when recording through VB-Cable

Post by Vincent Burel »

not expected to happen (0.1s is around one 4096 sample buffer).
could you post a screenshot of your VBCABLE Contol panel?
maybe the internal latency is not big enough.
jacobacci
Posts: 9
Joined: Sat Feb 20, 2021 7:04 pm

Re: Dropouts when recording through VB-Cable

Post by jacobacci »

Here's a screenshot of the Control Panel. As my use case is not latency sensitive at all, what would be the maximum to use for a safety cushion?


1.jpg
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jacobacci
Posts: 9
Joined: Sat Feb 20, 2021 7:04 pm

Re: Dropouts when recording through VB-Cable

Post by jacobacci »

I have now increased latency to 12288smp and I have indeed seen a reduction in dropouts. With a latency of 6144smp, I had 5 dropouts in the ca. 1 hour recording. With 12288smp I only had one. It would be great to find a way to get none.
I am wondering if it would help to set the output of Roon to use exclusive mode?
Here's the screenshot:

2.jpg
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jacobacci
Posts: 9
Joined: Sat Feb 20, 2021 7:04 pm

Re: Dropouts when recording through VB-Cable

Post by jacobacci »

I think I have figured out what the issue was / is.
At first, the latency was too low, that's why I got 5 dropouts. After increasing the latency, the numbers of dropouts reduced to one and I was able to trace that one to a dropout in the source file.
I have now redownloaded the album from Qobuz and I am not getting any more dropouts.
Happy camper, thank you
Vincent Burel
Site Admin
Posts: 1573
Joined: Sun Jan 17, 2010 12:01 pm

Re: Dropouts when recording through VB-Cable

Post by Vincent Burel »

if both application (player and recorder) use 4096 buffer, the internal cable latency must be 3x 4096 samples.
=12288 sample = min siez to have something working...

but for security you may set it to 4x or 5x 4096 samples
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