Video Test Generator User Guide 595
XTBH Arbitrary Top Border Height
Class AFD control parameter
Description Establishes the last line of a horizontal letterbox bar area at the top of the image.
Command syntax XTBW line_number
line_number
0 to 65535
Related commands XLBW, XRBW, XBBH
Example
XTBH 15
FMTU