Hi all , just after a bit of advice please, when looking at the 4 images in my screen I noticed that when I hover the mouse over the drop down boxes then click on streaming , the 2 top images are set to "S1" and the 2 bottom ones are set to "M" . What is the difference between these settings and should they both be set to the same and if so which one should I use . Hope I explained this ok as I am new to all this .