Since it seems to be a faulty system of the splitter or the grabber (Analog one from Logitech) where I get random flickering of single led´s (Visible in the preview as well), I am looking for recommandations of 4k HDMI USB grabbers. The 4k is only requested, because my reciever has dual monitor output and will scale both outputs to the lowest resolution. I think who does not have this, they can use standard low resolution converters. Does somebody has found a good one? Preferable without rainbow screen, so I can switch on the no signal detection. My old one shows the rainbow screen if no input is available.