The problem is that rMD does not accept zero as X or Y coordinates. I have a 1280x800 screen but I want to record the top portion of it: 1280x720.
So, it should be: x = 0, y = 0, width = 1280, height = 720.
However, when I try to set X and Y as zero, I get:
Argument Usage: -x X(number>0)
Argument Usage: -y Y(number>0)
BTW, I need this because I want to publish the video as HD (on youtube) and HD resolution is 1280x720. So, I cannot put X=1 and W=1279, it won't be a proper width.