Functions Index :: R :: ResizeOverlay
ResizeOverlay(clip base, clip ovl, int "f_start", int "f_end", int "w_start", int "w_end", int "h_start", int "h_end", bool "pcrange")
Continuously animates a clip's size  between a start and end frame, while in parallel overlays it on a base clip. The overlay is done such that the center of the overlayed clip is always on the center of the base clip, irrespectively of its size. 
base: The base clip on top of which the size animated ovl clip will be overlayed.
"f_start" (Optional, defaults to 0): The frame from which the size animation will start.
"f_end" (Optional, defaults to base.Framecount-1): The frame where the size animation will end.
"w_start" (Optional, defaults to ovl.Width): The starting width of the animated ovl clip.
"w_end" (Optional, defaults to ovl.Width): The ending width of the animated ovl clip.
"h_start" (Optional, defaults to ovl.Height): The starting height of the animated ovl clip.
"h_end" (Optional, defaults to ovl.Height): The ending height of the animated ovl clip.
"pcrange" (Optional, defaults to false): Has the same functionality as the pc_range argument of the Overlay() standard Avisynth function.
Notes and conditions on arguments relations:
1] The filter uses internally the Resize filter in order to execute clip resizing when needed. To control which specific Avisynth resizer will be used by the filter place a call to SetDefaultResizer with appropriate parameters before calling the filter.
bs = AVISource(...)
ov = AVISource(...)
# zoom in from 10x10 to 320x240
# change occures between frames 10 and 100
ovs = ResizeOverlay(bs, ov, 10, 100, 10, 320, 10, 240)
# zoom out from 960x720 to 320x240
ovp = ResizeOverlay(bs, ov, 10, 100, 960, 320, 720, 240)
: The filter uses internally the generic Resize filter. Currently, there is no option to specify a resizer in the argument list and thus resizer selection (if other than the default) must be performed through explicit calls to the SetDefaultResizer() helper function before invoking the filter.