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.

Fade-out duration [backwards]
median of red of green of blue
swing of red of green of blue
quality of red of green of blue

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
...read about flash effect