Not sure if this has been flagged before. EDIT: v3.4.0
Code:
BITS=16
BlankClip.ConvertToYV12.ConvertBits(BITS)
X = 16
Y = 16
W = 128
H = 128
#COL=$00FFFFFF # No Alpha
COL=$FFFFFFFF # Full Alpha
WHT=BlankClip(Width=W,Height=H,Color=COL) # Prob if RGB32 or YV12, but not YUV420P16
WHT=WHT.ConvertToYV12
#WHT=WHT.ConvertBits(BITS)
Overlay(WHT,x=X,y=Y)
crop(0,0,W+2*X,H+2*Y) # Crop Overlayed with 16 pixels border
PointResize(512,512) # for view
Rubbish at bottom of white