The Player Config looks like the image below:

You can use this dialog to configure each of the players individually via the corresponding tabs. The following options can be configured:
Player Name - enter the name of the player to be displayed.
Output Board - use this drop-down list to select the desired hardware to be used for output from the available boards on the corresponding server, to which the player is connected.
Video Standard - select your desired video standard from this drop-down list.
Aspect Ratio Converter mode - here select the desired converter mode to be used when aspect ratio conversion is required. You have three options - None, Letterbox and Crop.