The composite effect overlays a video, image or theme media item on top
of the underlying tracks. It is one of the more complex effects, so if your compositing
needs are relatively simply consider using the Picturebox effect
The core attributes supported by this effect module are
fade attribute is also supported,
to blend between these attributes and their corresponding faded attributes.
blend attribute allows the composited item to be merged into the underlying frame using
Flash's blend modes, like multiply, screen, lighten and darken.
composites: valid video or image media id
editable: comma delimited list of property names
fade: comma delimited pairs of percentages
id: single word string identifier, starting with a letter
length: floating point number (frames)
position: comma delimited percentage values
positionfade: comma delimited percentage values
rotate: floating point number between zero and 360
rotatefade: floating point number between zero and 360
scale: comma delimited percentage values
scalefade: comma delimited percentage values
shear: floating point number between zero and 360
shearfade: floating point number between zero and 360
symbol: a valid SWF URL, followed by an ampersand and class name
type: the string 'effect'