OBS has wildly different video delay among 3 inputs of Duo 2 card

[Tellisvision]

Is that right?
I have an audio feed comping in on USB, and three SDI cameras coming into one Decklink Duo 2 card.
Input 1 timing agrees with the audio, input 2 is hundreds of milliseconds behind the audio.
I might expect something like this if the video was coming from different sources, but the same card
I would expect the delay to be the same among the inputs.
Can I depend on the delays among these inputs to always be the same offsets from session to session?
Does it have to be this way or is it a bug?
Can send a log later if it actually needs to be researched.

 

[dmemphis]

Here's the log from the shoot.
We set up a test just now and all three cameras were in sync with the usb audio.
So we think its a time issue. We are letting the equipment and OBS roll in a recording and
will do a sync test later... this is where I expect a camera's video processing to have drifted to
be delayed compared to the others... we'll see.
Results are in... I was unable to reproduce the problem. I set up three cameras again, and fed audio
from a mic in through a Behringer USB interface (just like last night). After 30 minutes of recordeing
all three camera views remained in sync with the audio. So what happened last night was some kind of
fluke where one camera feed had an excessive amount of buffering. I am disappointed that I could
not reproduce this today, as now I have a situation which might randomly arise. I can't depend on
OBS for multi camera shoots in my configuration of bringing the cameras in on a Duo 2 card.
*sigh*
Here is a link to the production. It is positioned starting on cam1 which is in sync, then shortly
later the scene changes to another camera, and that feed is delayed w/ respect to the first
camera and the audio.

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