Integrating a Gefen EXT-HD-DSMP Digital signage player with TVS

If you have an atem tvs it's 1080i, it doesn't do 1080p. So try the player at 1080i if that doesn't work it might be a hdcp issue.. 

A.

Connect the player to the TV and adjust settings until the TV advises it's 1080i 60 or 1080 59.97. pressing the TV's  info button on its remote should resolve the set resolution of the box. Unlike the newer atems the TVS is quite flexible between 60 - 59.97.

If you've got the money, use a Teranex 2D ( or perhaps the newer cheaper model), put it in your rack. Monitor over the network, even add as a rentrant device to your matrix(videohub), it's "the Studio" way to do it.

Decorator.
Just get over the fact it's not a pretty rack mount piece of gear.
It's the right tool, and you already know from searching.
If you say I want a scaler but not decimator, then it is hard to help you.

But you could use Kramer 435

Not sure why you would think that mate.

Most people here wouldn't care about form factor, they are looking for cost effective solutions to problems, and hence the decimator and datavideo suggestions which provide perfect & very flexible solutions to your exact problem, and a problem many others have faced in the past.

and 

and

Was why I posted how I, and many "studio installations" I have worked with, convert from low-speed 1080p or computers or other devices not capable of 50Hz / 59.94Hz (except in PsF) to 1080i. 

What I think you are really asking is

• Is there a device that converts from 1080p at 1.5Gb/s speeds to PsF such that it's compatible with 1080i devices for less than the cost of a data video or decimator that is also in rack mount form factor with an internal power-supply?

And to answer that, the answer is no!

As Hatzenbach just mentioned the Decimator is the widely-accepted "best solution" that many people here use, and cable ties can help with organising mini-convertors.