How to darken the desktop with terminal commands?

how knows a trick?
i need to start several videos with mplayer form a bath file.
between the videos the screen has to be black.
so how can i make the whole desktop black with commands from terminal?
i am grateful for any idea.
hans

i need to start several videos with mplayer form a bath file.
between the videos the screen has to be black.
I'm not familiar with mplayer, but doesn't it have a kind of "playlist"?
VLC has a playlist which enables you to play a sequence of movies without leaving the fullscreen mode.

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