MessageClip
From Avisynth wiki
MessageClip(string message, int width, int height, bool shrink, int text_color, int halo_color, int bg_color)
MessageClip produces a clip containing a text message; used internally for error reporting. Arial font is used, size between 24 points and 9 points chosen to fit, if possible, in the width by height clip.
If shrink is true, the clip resolution is then reduced, if necessary, to fit the text.
