You forgot to explain what it is that you're trying to achieve.

Too often, people come here having already decided they know what their problem is, as well as how they need to fix it.

What they fail to understand is that a lot of people here have a lot of experience with the software and problem solving, in a way that makes them far more helpful if the entire situation is actually explained, rather than just asking how to help troubleshoot whatever you decided the situation is.

The framerate math for 29.97fps is messy enough before you even factor in the issues with NDI.

So I don't know what you're trying to do--because, again, you somehow forgot to mention it--but I do know that the way you're trying to do it is not the way you should do it.

The 2 delay options aren't meant to be used in unison. The video one isn't really meant to be used at all, except in very rare circumstances--that's why it's harder to find than the audio one.

If the audio and video are already in sync, the best advice is to not delay anything.

If neither are in sync, delay the one that's coming in faster to match.

Whatever else you're trying to achieve should be accomplished elsewhere.

Have you checked to see if the "Video Delay" input will help you do whatever it is that you're trying to do?

I'm pretty sure it's a precursor to Instant Replay, which is another thing you may be able to try.



Is there any way to not do that? Either finding another data provider, not using an overlay, or just manually keying in whatever data you're overlaying?

Fixing a non-vMix problem at the source generally works better, in my experience, than trying to reverse engineer a solution within vMix.

If Instant Replay works, it's still just a crutch & one you should be trying to find a path away from.

If it doesn't, the only practical use case for something like this, outside of edge cases like yours, is a censor/dump button system.

That's probably what you'd have to look at, and there's a reason that they're generally dedicated hardware that's expensive as all get out (especially for video processing).