Help choose correct HDMI GPU resolution to get standard PAL/NTSC signal
Out of your list, these look like your acceptable modes


  720 by 576 (16bit) 25 Hertz (Interlaced)
  
  720 by 480 (16bit) 30 Hertz (Interlaced)


Although depending on your adapter, it may be able to work with the other two as well. Note that all the modes are 16-bit so you are working with much reduced color resolution.

The Decklink modes are PAL and NTSC spec signal outputs and, I suspect, it will automatically downscale and crop your full resolution HDMI feed, so no need to tinker with your computer display modes.