Good evening

We have installed a vMix Pro version to Customer Studio.

The WorkStation has the Video Decklink Quad2 card.
If we connect the n° 4 PTZ Optics V60s in SDi - we do not find Delay problems
If we connect the same n° 4 PTZ Optics V60 in NDi - we suffer variable delays in the time domain
Can you please suggest to us the correct setting in order (ESPECIALLY) to compensate the variability of the delay?

Thank
Ciao.

I am experiencing similar problems with PTZ Optics cameras lately. I typically use 4 NDI cameras and usually had constant and similar delay on all of them. Now, the delay of the cameras starts off OK but after 10 minutes or so, the delay will randomly increase on one or two of the cameras ( and not always the same ones !). In order to get them in sync again, I reboot the cameras or reboot vMix and all is good. Of course I can't reboot vMix in the middle of a show, so I disconnect the offending camera from the switch and all is good for a bit, until it happens again. It makes it very difficult to produce a reliable clean show when one has to reboot the cameras so often...

This happens on 2 different vMix computer systems. I've also tried different routers and switches in several configurations and still the same result.

vMix ver 22.0.60, i7-7820 CPU, 24GB Ram, 1080Ti Video Card, Blackmagic Decklink Quad2, Blackmagic Decklink Duo2
TP-Link C1200 Router, also tried Asus Router
Netgear 24 port managed switch with POE, also tried 8 port unmanaged Netgear POE switch
2- PTZ Optics 12X NDI, 2- PTZ Optics 20X NDI

I'm not sure if it's a vMix, PTZ Optics, switch or router issue.. I'm leaning toward a camera issue as it also affects the SDI output of the cameras.

Richard

Howdy...

I am experiencing the same issue... All cameras are set to CBR...

Any help would be appreciated..

B.

Hi Ben,

Any delay is going to be an issue with the camera unfortunately.
We can know this because vMix itself uses a very small buffer of only a couple of frames, so it is not possible for vMix to suddenly delay a live source any more than that.

Each separate application uses a different stream output from the camera, so even when running Studio Monitor side by side
won't indicate the issue, as the stream being sent to vMix could be getting delayed independently.

I would suggest contacting PTZ Optics as they can advise the specific settings to configure the camera for the lowest latency
for NDI HX.

Regards,

Martin
vMix

Hi,

vMix uses the standard NDI-HX driver for decoding, (same as used in Studio Monitor).
So we don't really have any control over any decoding glitches and the like which would be a driver issue.

Best to contact PTZ Optics to see if they can suggest a solution.
I seem to recall disabling multicast in camera settings has helped in the past, but they should be able to confirm.

Regards,

Martin
vMix

I tested using OBS with all the same hardware and settings ( 4 PTZoptics cameras, Netgear POE switch, TP Link router, ASUS laptop computer and NDI divers) as vMix. Been running for 24 hours. All cameras remain in sync.

Edit: I also launched 4 instance of Newtek Studio Monitor with each of the 4 cameras in it's own window. All cameras remain in sync after 4 hours..