AFrameGrabberActor::Capture.cpp

void AFrameGrabberActor::Capture() {
    if (FrameGrabber.IsValid() && CaptureFrameTexture) {
        FrameGrabber->CaptureThisFrame(FFramePayloadPtr());
        TArray<FCapturedFrameData> Frames = FrameGrabber->GetCapturedFrames();

        if (Frames.Num())  {
            FCapturedFrameData& LastFrame = Frames.Last();

            CaptureFrameData.Empty();

            for (int32 i = 0; i < LastFrame.ColorBuffer.Num(); i++) {
                //FColor (R,G,B,A)->BGRA 
                CaptureFrameData.Add(LastFrame.ColorBuffer[i].B);
                CaptureFrameData.Add(LastFrame.ColorBuffer[i].G);
                CaptureFrameData.Add(LastFrame.ColorBuffer[i].R);
                CaptureFrameData.Add(LastFrame.ColorBuffer[i].A);
            }

            auto Region = new FUpdateTextureRegion2D(0, 0, 0, 0, LastFrame.BufferSize.X, LastFrame.BufferSize.Y);
            CaptureFrameTexture->UpdateTextureRegions(0, 1, Region, 4 * LastFrame.BufferSize.X, 4, CaptureFrameData.GetData());
        }
    }
}