Delay composition output

Hi,

I have a virtual production setup with a Vive Tracker attached on a Camera (Sony Alpha 7R ii). When i take a picture with the camera, the tracker sends simultaneously a trigger signal to UE4. So this way i want to take a HighResScreenshot of the composition, that is on the viewport created with the composure Plugin.

The problem is, that the Camera turns black for a short moment as i take a picture. So the Screenshot is also black. For now i can add a delay after the trigger (~0.25 sec and the Camera sends a signal again) and it works.

But is it possible to have a Buffer of the Viewport with the Composition? So i could grab a screenshot from some frames before the trigger executes?

Or is it generally possible to delay the rendering of the viewport a bit, i think this would also work…?

Thx