Hi,

Malfunctioning drivers on a system can cause latency and glitching issues in rare cases.
LatencyMon is a good tool for detecting these kinds of issues.

https://www.resplendence.com/latencymon

The change in the latest update is specifically for the Audio Outputs when used with ASIO audio devices.
ASIO audio devices typically demand lower latency then a system processing large amounts of video can handle,
so we have added a dynamic buffer to add more latency when needed in these cases, but it is not related
to latency issues in general, which are typically due to a system being overloaded or some malfunctioning drivers.

Regards,

Martin
vMix

Done a Show with the .61 this evening.
Dante VS Output was perfect.

But Dante input keeps dropping over time. Over 200 Dropped "Frames" on all 3 Dante Inputs in 90min Show.
Restarted DVS and vMix prior Show, then connected 5 Calls, 1 SDI In via Decklink Duo2, 1 SDI Out, stream an recording.

System:

Supermicro X299 Mainboard
Intel Core i9 10900X
16GB Ram
Nvidia Quadro P2200 5GB



Markus

H again. After hours of testing it looks like the culprit (maybe) is USBXHCI.SYS

With vMix closed wdf01000.sys is running at about 0.01 in latency mon and USBXHCI.sys doesn't show at all in WPA. As soon as vMix is opened this climbs to 0.2 in latency mon and as soon as it reaches above one we hear and/or see glitchy audio and video. At times, this goes up to 3.5ms etc. If I re-run WPA at this point, USBXHCI.sys is at the top of the list.

Does this make any sense? Also, if vMix is not open, USBXHCI.sys isn't showing at all and it jumps into life when vMix begins to run. Is it required?

Thanks in advance

I think I have made some progress. We are using a Presonus 24r. With the Presonus interface using any inputs or outputs in the vMix preset we get really high execute times on latencymon and it intermittently glitches. So question 1 is whether anyone is using the same interface with no issues and question 2 is whether Martin can shed any light on why this might be happening.

I'm going to add the Presonus question as a new thread for maximum views and hopefully responses.

nomski,

As it is a hardware issue you will likely experience problems regardless of software on that computer, so not much we can do about that in vMix.
I would suggest checking for the latest drivers for everything possible, then unplugging all USB devices etc one by one to try and track down the culprit.

This is certainly not a normal thing, and doesn't occur for most users, but in some cases unfortunately bad drivers can cause problems
and it is often difficult to track down in those rare cases.

Regards,

Martin
vMix

RME make good audio interfaces... not sure how tested they are with vmix but a lot of people recommend their devices with DAWs.. they are expensive though..


Martin.. could it be possible drop outs like this are related to the way in which vmix fixes the buffer settings ? i saw you posted that it uses a minimum of 960 but that seems an unusual number.. no audio interfaces or DAWs ive used have that setting manually.. its always 512, 768 or 1024 etc.. (some dont even use 768).. maybe their is something in the way certain drivers are written that doesnt expect 960 or other "non standard" intervals and therefore leads to glitches ?

for example DVS user guide only lists 512 and 1024... https://dev.audinate.com...help/content/options.htm


is there any reason why it starts with 960 and not 1024 ?

yes and no, but it won´t change anything if i´m using another or not.