Fade-out Effect
This effect is mainly used to fade the picture in when action starts and
fade it out from view by the end of scenario.
Remarks
Duration is a positive number that doesn't exceed 15000.
It defines how long the effect lasts. Backwards keyword reverses the effect forcing it
to perform backwards from the end. When it's present a fade-out turns a fade-in.
Median parameter sets the moment of luminosity splash
separately for red, green and blue channels. Swing specifies the extent of color variation.
Positive values gain up the luminosities, negative ones stifle the colors. Quality affects the
sharpness of color variation. It's usually trapped in range between 0.5 and 0.0001.
Example
# Smoothly starts the video
Scene once
Fade-out 200 backwards
median 0 0 0
swing 0 0 0
quality 0 0 0
End