If you often need to switch back and forth between two video sources, the SlingStudio Console app offers a feature that can make that easy.
Normally video sources in Preview "move" to Program when you tap or click PREVIEW TO PROGRAM. But you can also have Preview and Program video sources swap places every time you tap or click the button.
Sending video sources from Preview to Program (in one direction)
Swapping video sources between Preview and Program (going back and forth)
As with any other video transition, you can choose between Cut, Dissolve, and Wipe transition types.
Note: The video transition that you choose (Cut, Dissolve, Wipe) only apply to the Program window. Transitions do not apply to the Preview window.